Attachment 15_SGBP 22-0041 Repair HVAC B1226_Design Analysis.pdf

DESIGN ANALYSIS

100% Submittal

REPAIR HVAC, B1226

Offutt A.F.B., Nebraska

OAFB Project No. SGBP 22-0041 Contract No. FA4600-22-D-0003

HGM Project No. 740422

July 17, 2024

FA460025R0002

Attachment 15

OFFUTT AFB REPAIR HVAC, B1226

SGBP 22-0041

TABLE OF CONTENTS

I. PROJECT DESCRIPTION

II. DESIGN ANALYSIS

III. COST ESTIMATE

IV. MEETING MINUTES

V. 35% REVIEW COMMENTS & RESPONSES

VI. 65% REVIEW COMMENTS & RESPONSES

VII. 90% REVIEW 6/7/2023 COMMENTS & RESPONSES

VIII. 90% REVIEW 5/15/2024 COMMENTS & RESPONSES

IX. CATALOG CUT SHEETS

X. CHECKSUMS

XI. CONDUCTIVITY TEST

FA460025R0002

I. PROJECT DESCRIPTION

PROJECT DESCRIPTION

This project is to repair or replace the HVAC system of B1226 including heat pumps, associated piping, devices, insulation, and controls. The ground source well system will be tested for capacity, leaks, obstructions, and contaminants and if any deficiencies are discovered, this project will perform the necessary solutions to resolve and restore well field capacity. This project shall include analysis for the need to add a back-up heating component to the water loop. The focus of the project will be on the water loop side of the system.

Significant changes to the air distribution system and duct work are not anticipated unless current code requirements dictate otherwise.

The installation of the new system shall also include the replacement of the DDC control system. The new system shall be compatible with the Base Honeywell WEBs-AX BMS with a LonWorks communication protocol network.

The design shall conform to all current codes and standards applicable to this Base facility, including AFI’s, UFC’s, and UFGS specifications.

FA460025R0002

II. DESIGN ANALYSIS

Mechanical Systems

Fire Protection Systems

B1226 FP Existing Conditions

1. The building is not currently protected by a fire suppression system.

B1226 FP Primary Design Assumptions

1. The Statement of Work does not require the building to be protected by a fire suppression system.

B1226 FP Design Description

No fire suppression scope of work is anticipated.

B1226 FP Design Variances

1. Not applicable.

B1226 FP Requests for Information

1. None

Plumbing Systems

B1226 Plumbing Existing Conditions

1. The Statement of Work does not specifically include any modification / replacement of the following systems. The addition of a fluid cooler requires a drain for the overflow and drain of the water basin and a make-up water supply. Detailed field investigation / verification was limited to the lower level mechanical room. Below grade piping configuration and routing were not observed. Detailed field investigation / verification was not completed on the following systems outside of what is described above.

a. Storm Drainage System

b. Plumbing Fixtures

c. Sanitary & Vent Systems

d. Domestic Water Systems

It was observed during the site visit, that the floor drains in the basement mechanical room had backed up previously. There was no standing water in the room at the time of the site visit, but there was evidence of a back-up.

2. Natural Gas Service: This building has an abandoned natural gas service located in the basement mechanical room. The existing service is disconnected outside of the building.

B1226 Plumbing Design Description

The Statement of Work does not require any work directly effecting the plumbing systems. New floor drains / floor sinks will be provided to support new HVAC systems. The existing sanitary lines shall be camera scoped to verify no obstructions and condition of the sanitary lines. Provide drain auguring / snaking as required to remove any obstructions. Water jetting will not be allowed. New domestic cold-water systems will be provided as necessary to support new HVAC systems.

Common Information

The following information is common to all work, where applicable, and is provided once for brevity.

New domestic water piping will be copper with fiberglass insulation. New waste and vent piping (above and below grade) will be cast iron. Natural gas piping will be steel. Corrugated stainless steel piping will not be allowed for natural gas piping.

HVAC Systems

B1226 HVAC Existing Conditions

1. The existing system consists of a geothermal heat pump loop and water source heat pumps (HP) serving the individual zone. The HP are primarily housed in three separate mechanical spaces.

The HP located in these mechanical spaces are vertical units. Additionally, there are console HP units serving individual rooms, as well as portions of the main chapel. The heat pumps, existing pumps and piping specialties are approximately 20 years old.

2. The preliminary findings from K2 Construction indicated a significant amount of debris in the well field, as well as metal particles.

3. Basement Mechanical Room: The basement mechanical room houses the geothermal heat pump loop pumps, as well as the piping specialties such as the air separator, expansion tank and side stream filter. The existing equipment is set on concrete housekeeping pads. There are several abandoned pads from the buildings previous systems. The mechanical room is used as a return plenum and outdoor air is delivered directly to the room. A single return fan is located in the space. This fan is connected to a relief hood located on the roof. The relief hood is isolated with motorized dampers. The intake louver is located within the stairwell leading down to the mechanical space. This mechanical room houses five HPs serving the Chapel. The outdoor air intake louver is located less than 10’-0” above grade.

4. Mechanical 131: Mechanical 131 is accessed from the exterior. The room houses six HP. The room is used as a return air plenum, with return duct from the varies spaces served stubbed into the room. The room also has an outdoor air louver that is stubbed into the space with a motorized damper. No return fan was observed serving this room. The louver is located less than 10’-0” above grade and below a cover alcove of the space.

5. Mechanical 111: Mechanical 111 houses three HP and a single return fan. The room is used as a return air plenum, with a single return air duct open to the room. There is an existing outdoor air intake louver located in the space. The intake louver is approximately 5’-0” above grade.

6. There are approximately ten console style HP serving Offices 110, 111, 112, 113, Narthex 101, and the chapel balcony.

B1226 HVAC Primary Design Assumptions

1. Primary standard is the International Mechanical Code with UFC amendments.

2. Weather Data: Per UFC 3-410-01, weather data for Offutt AFB included in the 2021 ASHRAE Handbook of Fundamentals will be used in HVAC load calculations. ASHRAE weather data is widely used as the accepted source in the industry.

3. Weather Data: Per UFC 3-410-01, the 1% dry bulb (91.4°F) and corresponding mean coincident wet bulb temperature (75.8°F) and the 1% humidity ratio (138.7) and corresponding mean

FA460025R0002

coincident dry bulb temperature (83.6°F) shall be used for comfort cooling design. Exception for Specialized Technical Requirements allow the use of 0.4% dry bulb temperature (95.0°F).

4. Weather Data: Per UFC 3-410-01, the 99% dry bulb (1.7°F) shall be used for comfort heating design.

5. HVAC Calculations: We recommend using the Radiant Heat Balance method recommended in the current edition of ASHRAE fundamentals.

6. HVAC Calculations: UATD methodology used for heating calculations.

7. HVAC Calculations: Since this is not a major renovation, we assume the envelope will not be improved to meet current energy code (ASHRAE 90.1-2013) requirements. HVAC calculations will be made with assumptions of existing envelope thermal characteristics based on existing construction documents and field observations.

8. HVAC Calculations: TM-5-810-01 - Indoor design conditions (cooling) - 75°F DB @ 50% RH.

Dehumidification is inherent to DX cooling. Hot gas reheat will be included on all units for additional dehumidification control. This feature uses the waste heat from the compressor to reheat the supply air after the DX cooling coil. The HGRH option is not available for console style units. Indoor design conditions (heating) - 68°F DB. MEI does not recommend adding humidification to existing buildings due to the loose construction nature of older buildings.

Based MEI will look at providing humidification features to the rooms serving the children’s classrooms per discussion with Justin Robinson.

9. HVAC Calculations: TM-5-810-01 Cooling Calculations - Allowed to increase by 10% for morning recovery or future loads.

10. HVAC Calculations: TM-5-810-01 Heating Calculations - Allowed to increase by 30% for morning recovery.

11. HVAC Calculations: Ventilation per ASHRAE Standard 62.1-2016.

12. HVAC Calculations: Occupant density assumptions provided below.

13. HVAC Calculations: Lighting density per ASHRAE 90.1-2013.

14. HVAC Calculations: Miscellaneous Equipment - Generic information has not been provided.

The HVAC calculations include assumptions of total wattage based on field observations. More detailed information will be required to refine space cooling requirements.

15. HVAC Calculations: The following building envelope values were assumed:

a. Wall R-value: 9 – This was based on modeling of the existing wall sections per the 1963 drawings. These drawings indicated 1.5” of batt insulation.

FA460025R0002

b. Roof R-value: 6 – This was based on modeling of the existing building section per the 1963 drawings. These drawings indicated 1.5” of rigid insulation above the deck.

c. Glazing: double ¼” clear: U-factor 0.5; Shade Coefficient: 0.55 – These are industry standards for double pain clear glass.

16. Equipment Selection (Boilers): MIL-HDBK-1190, Chapter 14, Section 2 - The number and size of units will be selected to efficiently handle the maximum winter design load to supplement the geothermal well field.

17. Equipment Selection (Boilers): MIL-HDBK-1190, Chapter 14, Section 2 - Standby boilers will not be provided unless justified.

18. Equipment Selection (Air Cooled Chiller): During design review meetings, the amount of supplemental heat rejection and type of rejection were discussed. The government explained the maintenance concerns associated with evaporative cooling equipment. They expressed their desire to use a packaged air cooled chiller. Due to the size of the existing electrical service, existing electrical loads and new electrical load from the air cooled chiller, the government made the decision to size the air cooled chiller to maximize the existing service capacity. This allowed for a 40 ton air cooled chiller, approximately 40% of the required heat rejection. With this configuration, the existing geothermal well field must be utilized.

The following occupancy assumptions were made. ASHRAE 62.1-2016 ventilation rate tables were used as a general guide. Egress densities are not typically used for load calculations as these number are typically much higher than the actual occupancy the space will see. The overestimation of occupancy level can lead to equipment oversizing, and lead to comfort complains and service life reductions when the equipment is overside for the intended use.

19. HP-1: Serves Lobby 101, assumed maximum occupancy, no people, transient space.

20. HP-2: Serves Office 107, assumed maximum occupancy, 2 people.

21. HP-3 & 6: Serves basement assembly, assumed maximum occupancy, 90 people.

22. HP-4: Serves Meeting and south side of Assembly 103, assumed maximum occupancy, 20 people in meeting, and 25 people in in south side of Assembly 103.

23. HP-5: Serves Choir and north side of Assembly 103, assumed maximum occupancy, 20 people in Choir and 25 people on north side of Assembly 103.

24. HP-7: Serves the western wing of the main Chapel, assumed maximum occupancy, 30 people (6 people per pew).

25. HP-8: Serves the eastern wing of the main Chapel, assumed maximum occupancy, 60 people (6 people per pew).

FA460025R0002

26. HP-9: Serves the classrooms along the north side of the main Chapel, assumed maximum occupancy, 5 people per classroom, total occupancy 25 people.

27. HP-10a – e: these five heat pumps serve the main chapel via a common supply duct, assumed maximum occupancy, 156 people (6 people per pew).

28. WHSP-11 & 21: These are console units serving the Narthex, assume maximum occupancy, no people, transient space.

29. HP-12 & 13: These are console units serving the Chapel Balcony, assume maximum occupancy, 84 people (6 people per pew).

30. HP-14: Console unit serves General Office 113, assumed maximum occupancy, 2 people.

31. HP-15: Console unit serves Chaplain’s office 112, assumed maximum occupancy, 2 people.

32. HP-16: Console unit serves Chaplain’s office 111, assumed maximum occupancy, 2 people.

33. HP-17: Console unit serves Chaplain’s Office 110, assumed maximum occupancy, 2 people.

34. HP-18 & 19: Console units serving the small chapel, assumed maximum occupancy, 10 people (based on the number of chairs in the space).

O

FF

U

TT

A

FB

H V

A C

R

EP

A

IR

, B

SG

BP

2-

D

ES

IG

N

A N

A

LY

SI

S 7

A

SH

R A

E M in . V en til at io n R at es

T ab le

.2

.2 .1 ss um ed O cc up an cy

R oo m

N um be r

R oo m N am e

Sq ua re

Fo ot ag e

Sp ac e C la ss ifi ca tio n

O cc up de ns ity

S F

R eu sl tin g cc up

C ou nt ss um ed cc up es ul tin g

Pe op le D en si ty

/ 1

SF

em ar ks

O ff ic e

O ff ic e

Sp ac e

Si ng le o cc up an cy o ff ic e w ith o ne ad di tio na l p er so n

O ff ic e

O ff ic e

Sp ac e le o cc up an cy o ff ic e w ith tio na l p er so n

O ff ic e

O ff ic e

Sp ac e le o cc up an cy o ff ic e w ith tio na l p er so n

O ff ic e

O ff ic e

Sp ac e le o cc up an cy o ff ic e w ith tio na l p er so n

Sm al l C ha pe l

Pl ac e of W or sh ip nt ed

S ea ts

Pe w s

O ff ic e

O ff ic e

Sp ac e

Si ng le o cc up an cy o ff ic e w ith tio na l p er so n

Li br ar y

Li br ar ie s

Es tim at e ba se d on se at s a nd ta bl in sp ac e.

N or th nn ex

C on fe re nc e

R at e ba se d on se at s a nd ta bl

So ut h A nn

C on fe re nc e R at e ba se d on se at s a nd ta bl

K itc he n

K itc he

N ot a re gu la rly o cc up ie d sp

U

TT

A

FB

H V

A C

R

EP

A

IR

, B

2-

IG

N

A N

A

LY

S 8 ho ir

C on fe re nc e

R at e ba se d on se at s a nd ta bl

N ar

C or rid

N ot a re gu la rly o cc up ie d sp

En cl os ed C ha pe l W in g

Pl ac e of

W or nt ed S ea ts

Pe w s

C ha pe l

Pl e of W or nt ed

S ea ts

Pe w s

O pe n

C ha pe l

W in g

Pl ac e of W or nt ed

S ea ts

Pe w s

B al co ny

Pl ac e of W or nt ed

S ea ts

Pe w s

Su nd ay

S ch oo l

C la ss ro om (a ge s

5- 8)

B as ed o n ch ai rs a nd ta bl es in th e sp

Su nd ay S ch oo l

C la ss ro om

(a ge s ed o n ch ai rs a nd ta bl es in th e sp

U sh er s a nd ff er in g C ou nt er s ff ic e

Sp ac e

N ot a re gu la rly o cc up ie d sp ac e

Su nd ay S ch oo l

C la ss ro om

(a ge s ed o n ch ai rs a nd ta bl es in th e sp

Su nd ay S ch oo l

C la ss ro om

(a ge s ed o n ch ai rs a nd ta bl es in th e sp

Su nd ay sc ho ol

C la ss ro om

(a ge s ed o n ch ai rs a nd ta bl es in th e sp as em en t S on fe re nc e

R ed o n ch ai rs a nd ta bl es in th e sp

U

TT

A

FB

H V

A C

R

EP

A

IR

, B

2-

IG

N

A N

A

LY

S 9 as em en t N on fe re nc e

R ed o n ch ai rs a nd ta bl es in th e sp as em en t K itc he n

K itc he

N ot a re gu la rly o cc up ie d sp

OFFUTT AFB HVAC REPAIR, B1226

B1226 HVAC Design Description The Statement of Work for Building B1226 includes the following major items:

• Replace all heat pumps (24 total; 14 vertical; 10 console) and associated controls.

• Replace the associated piping, and piping components associated with each heat pump.

• Determine the need and provide backup heat source and heat rejection source to supplement geothermal well field

Heat Pumps (vertical) The proposed replacement of the vertical heat pumps, (HP-1 – 10E) will consist of vertical heat pumps rated for geothermal applications.

Heat Pumps (console) The proposed replacement of the vertical heat pumps, (HP-11 – 19, & 21, could not find HP-20, or reference to HP-20 in the existing documents) will consist of console heat pumps rated for geothermal applications.

Mechanical Spaces The associated piping with the HPs in each of the mechanical rooms will be replaced. New piping layouts will be provided for the reconnection to new HPs. New heat pump loop pumps and associated piping specialties, such as air separator, expansion tank, side stream filer and new glycol feed tank shall be provided.

Supplemental Boiler The proposed supplemental heat is a high efficiency, condensing boiler capable of injecting approximately 50% of the required heat into the heat pump loop.

Supplemental Air-Cooled Chiller The proposed supplemental heat rejection equipment will consist of a 40 ton packaged air-cooled chiller, capable of rejecting approximately 40% of the total heat rejection required.

B1226 HVAC Design Variances The following variance was accepted during the 35% design review meeting:

• The existing outside air intake louver is not the required 10’-0” above grade. However, there is an existing floor above this area. Routing new outside air ductwork to the existing roof would be challenging.

We request the following variances:

• The existing louver sizes are not large enough to accommodate full air side economizer mode for the equipment that is over the maximum capacity requirement stated in the International Energy Code, 54 MBH. Routing an outdoor air duct large enough to accommodate full economizer would be challenging. The new OA louvers would also need to be considered, FA460025R0002 preliminary size estimates are as follows: Basement Mechanical Room: 40 square feet louver; West Mechanical Room: 33 square feet; East Mechanical Room: 36 square feet. In addition, to the challenges mentioned above, the individual heat pumps would need to have ducted returns back to the unit, as some spaces could be in heat mode, while others in cooling mode during times of economizer use. The current configuration uses the mechanical space as a return plenum / mixing chamber. The existing mechanical room sizes and configuration do not allow for the installation of dedicated return air ductwork to the water source heat pumps, nor room for individual outdoor air ductwork routed to each unit. Significant temperature gradients will be seen across the mechanical rooms, when a large outdoor air louver/opening is stubbed into the mechanical room. It would be difficult for the control system to monitor and adjust mixed air temperatures in a non-controlled space (I.E. in ductwork). There is also concern for localized freezing in the mechanical spaces due to the stratification and temperature gradients when introducing -10°F air into the space.

Significant ductwork modifications would be required in each space. Based on preliminary sizing, the required ductwork, and additional equipment would not fit within the existing mechanical spaces.

Can the economizer requirement be omitted on this project?

• We will complete a condensation analysis on the wall construction before the next submission. Based on the existing drawings, there does not appear to be any vapor barrier in the wall or roof construction. This will most likely lead to moisture issues. This is more of a heads up than an official request for variance.

Natural Gas System The existing gas service was abandoned. A new service shall be brought to the building. The existing gas piping will need to be cleaned, purged, modified and gas piping extended to the new backup boiler.

Duct Distribution Conditioned air will be routed from the heat pumps and reconnected to existing distribution systems.

Existing distribution ductwork systems will be cleaned. On one system, the proposed airflow is greater than the existing ductwork can accommodate; this systems main shall be replaced with a larger size.

All ductwork shall be galvanized steel constructed, insulated and sealed in conformance with SMACNA standards.

Supply air will be supplied to occupied spaces through existing diffusers, registers and grilles.

Fire and smoke dampers will be provided as required by code.

Ductwork sizing shall meet the following requirements:

• Low Pressure Ductwork

- Air velocity in ductwork and risers shall not exceed 1,500 feet per minute or 0.08” w.g. pressure drop per 100 feet of duct. No duct liner shall be used.

Ductwork construction shall be in accordance with SMACNA Standards

Ductwork insulation shall meet the following requirements:

• All ductwork insulation shall meet the requirements of 2018 International Energy Conservation Code. Internal free area shall be maintained and used for velocity calculations.

• Supply Air – Rectangular and Round, concealed o 2" Mineral –fiber blanket, with vapor retarder. Minimum R-Value: R6 installed.

• Supply Air – Terminal Unit 10’ down stream o 2" Mineral –fiber blanket, with vapor retarder. Minimum R-Value R6 installed

• Return Air – Rectangular o 2" Mineral –fiber blanket, with vapor retarder. Minimum R-Value R6 installed

Heat Pump Loop Piping The exposed piping, heat pump connection piping and accessories (valves, fittings, insulation, etc.) is in poor condition within the mechanical rooms. The accessible piping located within the mechanical spaces shall be replaced. Piping shall be sized at friction loss of 3’ per 100’ of piping.

Two new based mounted end suction pumps shall be provided for the heat pump loop circulation.

The pumps shall be sized at 100% building load, each, for 100% back-up capacity.

A glycol feed system shall be included in the equipment replacement project. Using a glycol mixture of 30% polypropylene glycol provides both freeze/burst protection in the system and acts as a rust inhibitor. A side stream pot feeder will be provide at one of the circulation pumps to allow for additional chemicals to be added to the system as needed.

Back-up Heat Source & Heat Rejection Equipment

After discussing with several national experts on well field sizing, they have confirmed that determining the capacity of an existing well field cannot be calculated. A snapshot of capacity can be given, based on the thermal property data taken during testing. With the data, we can size the number of well fields to achieve a temperature change at a given flow rate. The unknown being how much the ground temperature has been changed over the lifespan of the existing well field.

An analogy would be a bucket of water, in the summer the building is putting more and more water into the bucket, and in the winter the building is pulling water out of the water. Since the well field has been in operation for some time, we do not know if said bucket is full or empty. The sizing programs assume a semi balanced load, however if the load is unbalanced, you will begin to see ground temperature changes. The test data shows an undisturbed ground temperature of 56.2°F. We typically see these value in the range of 52°-56°. The testing was conducted in January, during the peak heating season. I would expect loop temperatures to be a their lowest during peak heating season.

We created an energy model of the existing building. First, we adjusted the occupancy levels in each zone so peak cooling loads matched the capacity of each respective existing WSHP. Assumptions were made for occupancy schedules and building use. We used the annual load profile from the energy model to calculate a well field design as if this were a new project. Based on that information, FA460025R0002 we concluded a well field of 140 wells at a depth of 115’ (matches existing) for the cooling load would be required. Our calculations show this building to be heat dominant and requires approximately 430 wells.

Next, we updated the energy model to reflect occupancies based on seat counts and typical densities (this means some existing WSHPs are not adequately sized for these occupancies). Based on these numbers, we concluded a well field of 144 wells at a depth of 115’ for the cooling load would be required; 340 wells for the heating load.

In reality, the number of wells would not change between the heating and cooling season. The larger of the cooling or heating season well requirement would be needed if this were a new project.

Additionally, we looked at the predicted ground temperature changes over the next 10 years, based on the load model. The analysis software showed a ground temperature increase of 8.2 degrees over the next 10 years. The concern is the increasing ground temperature will degrade the well fields performance, and it will be short in cooling season. The unknown is how much the existing ground temperature has been affected by the well field over the life of the system. Modeling the system with 50% flow through a fluid cooler showed a ground temperature increase of approximately 2 degrees.

In conclusion, the existing well field is adequately sized to accommodate the existing connected equipment during the cooling season now, but does show a drift in ground temperatures that could cause problems in the future. A boiler is recommended to supplement the well field. We typically sized the back-up heat source for WSHP at 10-15 BTU/SF of building. A fluid cooler should also be considered to supplement the well field. During design discussions with the government, it was deemed a fluid cooler is too labor/maintenance heavy to operate evaporative cooling. Instead, there was a desire to use a packaged air cooled chiller, with no spray basin or other evaporative cooling associated. The chosen size of the air cooled chiller maximizes the connected electrical load on the existing electrical service.

Below is the assumed building usage scheduled used for the energy model.

Monday: 0:00 – 8:00 = 0% 8:00 – 20:00 = 50% 20:00 – 0:00 = 0%

Tuesday: 0:00 – 8:00 = 0% 8:00 – 20:00 = 50% 20:00 – 0:00 = 0%

Wednesday: 0:00 – 8:00 = 0% 8:00 – 16:00 = 50% 16:00 – 17:00 = 75% 17:00 – 19:00 = 100% 19:00 – 20:00 = 75% 20:00 – 0:00 = 0%

Thursday: : 0:00 – 8:00 = 0%

FA460025R0002

8:00 – 20:00 = 50% 20:00 – 0:00 = 0%

Friday: : 0:00 – 8:00 = 0% 8:00 – 20:00 = 50% 20:00 – 0:00 = 0%

Saturday: 0:00 – 8:00 = 0% 8:00 – 16:00 = 50% 16:00 – 17:00 = 75% 17:00 – 19:00 = 100% 19:00 – 20:00 = 75% 20:00 – 0:00 = 0%

Sunday: 0:00 – 7:00 = 0% 7:00 – 8:00 = 50% 8:00 – 12:00 = 100% 12:00 – 13:00 = 75% 13:00 – 20:00 = 50% 20:00 – 0:00 = 0%

Temperature Control

B1226 TC Design Description

All equipment will be controlled by an electronic microprocessor based Direct Digital Control (DDC) system. The DDC system will be the primary control mechanism for all heating, cooling, and ventilation equipment.

All schedules and set points will be adjustable and modifications will be readily accomplished through an on-site terminal or the existing base energy management system. Each zone or space will have individual control and be addressable from the central operator station to assist in troubleshooting.

The Task Order Project Scope states the design of the new system shall also include the replacement of the DDC control system. The new system shall be compatible with the Base Honeywell WEBs- AX BMS with a BACNET communication protocol network. We have been told by controls contractors and vendors that LonWorks will be obsolete in coming years.

FA460025R0002

ELECTRICAL SYSTEMS

A. Basic Electrical Materials and Methods

1. Electrical metallic tubing (EMT) will be the primary wiring method in the facility utilized for all branch circuits and in all areas of the building where exposed to view.

2. Rigid galvanized steel (RGS) will be used for exposed exterior work or where conduits are subject to damage.

3. Rigid nonmetallic conduit will be utilized for buried exterior work.

4. Conductors will be copper with THHN/THWN insulation. Conductors will be color coded.

5. Green insulated equipment grounding conductor will be installed in all feeders and branch circuits.

6. Dedicated neutral conductors will be provided for each branch circuit. Shared neutrals are not allowed.

7. Wiring devices will be specification grade, 20-amp minimum.

8. Device coverplates within finish spaces shall be smooth finish thermoplastic.

9. Device coverplates within un-finished spaces shall be galvanized steel.

10. Disconnect switches for equipment will be heavy-duty type.

11. All exterior disconnect switches will be NEMA 3R rated.

B. Electrical Distribution Design

1. New HVAC equipment will connect to existing electrical distribution equipment.

FA460025R0002

III. COST ESTIMATE

COST ESTIMATE

OPINION OF PROBABLE COST SUMMARY

Mechanical Improvements $1,410,704

Electrical Improvements $166,521

Site Improvements $6,473

Total Construction Cost $1,583,698 iv . 2

- D em ol iti on

Ve rti ca l W

SH

P ea

$1 ,9

.0

$2

6, 0.

$2 6, 0.

$2

6, D iv

. 2

- V er tic al

W

SH

P ea

5, 0.

$6 ,0

.0

$7

2, 0.

$8 4, 0.

$1

,8

.0

$1

,8

D iv

. 2

- D em ol iti on

C on so le

W

SH

P ea

$1

,9

.0

$1 9, 0.

$1

9, 0.

$1 9, D iv . 2

- C on so le W

SH

P ea

5, 0.

$3

.0

$5 8, 0.

$3

0, 0.

$8 8, 0.

$8

8, D iv

. 2

- D em ol iti on

H ea t P um p Lo op P um ps ea

$6

.0

$1 ,3

.0

$1

,3

.0

$1 ,3

D iv

. 2

- D em ol iti on hy dr on ic p ip in g lf

$1

2.

$3 ,8

.0

$3

,8

.0

$3 ,8

D iv

. 2

- H yd ro ni c Pi pi ng

M ai ns lf

.0

6.

$9

,6

.0

$1 1, 0.

$2

1, 0.

$2 1, D iv . 2

- H yd ro ni c

Pi pi ng In su la tio n

- M ai ns lf

4.

$8

.4

$1 ,5

.0

$2

,6

.0

$4 ,2

.0

$4

,2

D iv . 2

- H ea t P um p

Lo op

P um ps ea

,0

.0

.0

$6

0, 0.

$1 6, 0.

$7

6, 0.

$7 6, D iv . 2

- H ea t P um p

Lo op

P um p

VF

D s ea

4, 0.

$1

,1

.0

$8 ,0

.0

$2

,2

.0

$1 0, 0.

$1

0, D iv

. 2

- H ea t P um p Lo op A ir Se pa ra to r ea

,0

.0

.0

$1

7, 0.

$8

.0

$1 7, 0.

$1

7, D iv

. 2

- H ea t p um p lo op E xp an si on

T an k ea

3, 0.

$2

.0

$3 ,5

.0

$2

.0

$3

,7

.0

$3 ,7

D iv

. 2

- B oi le r ea

,4

.0

,8

.0

$2 9, 0.

$6

,8

.0

$3 6, 0.

$3

6, D iv

. 2

- N at ur al

G as

P ip in g ea

0.

.0

$4

.0

$1 ,8

.0

$2

,2

.0

$2 ,2

D iv

. 2

- B oi le r F lu e

/ C om bu st io n

Ai r ea

1, 0.

,7

.0

$1 ,1

.0

$2

,7

.0

$3 ,8

.0

$3

,8

D iv . 2

- T em pe ra tu re C on tro ls

BM

S

(B oi le r, Ai r

C oo le d

C hi lle r, H

PL

Ps ea

5.

$7

.0

$9

,0

.0

$3 0, 0.

$3

9, 0.

$3 9, D iv . 2

- G ly co l F ee d Sy st em ea

3, 0.

$7

,5

.0

$3 ,2

.0

$7

,5

.0

$1 0, 0.

$1

0, D iv

. 2

- A ir

C oo le d

C hi lle r ea

0, 0.

$2

,0

.0

$2

,0

.0

$2

,0

.0

$5

,0

.0

$5

,0

D iv . 2

- H yd ro ni c pi pi ng to

A ir

C oo le d

C hi lle r lf

.0

$5 2.

$1

1, 0.

$1 3, 0.

$2

4, 0.

$2 4, C on tre te P ad ea

1, 5.

,5

.0

$1

,6

.0

$2 ,5

.0

$4

,1

.0

$4 ,1

Tr en ch in g fo r n ew p ip e C

.Y

$1

3.

$7

.0

$7

.0

$7

Ba ck fil lin g fo r n ew p ip e

C .Y

$2 5.

$1

,3

.0

$1 ,3

.0

$1

,3

D iv . 2

-A ir C oo le d C hi lle r P um p ea

,0

.0

.0

$2

0, 0.

$6 ,0

.0

$2

6, 0.

$2 6, D iv . 2

- B oi le r P um p ea

,0

.0

.0

$1

0, 0.

$3 ,0

.0

$1

3, 0.

$1 3, T al D ire ct

C os ts $1

,1

,1

O ve rh ea d

$1

,2

Su bt al

,2

,4

Pr of it

$1

,2

TO

TA

L

PR

IC

E

$1 ,4

,7

M

EC

H A

N

IC

A L

C O

N

TR

A C

TO

dd re ss

C O

N

TR

A C

T

FO

R (W or k to b e pe rfo rm ed

R ep ai r H

VA

C

, B

P

R O

P O

S E

D T

O

TA

L C

O N

TR

A

C T

P R

IC

E

P U

R C

H A

S E

R E

Q U

E S

T N

U M

B E

R

P R

O

JE

C T

N U

M B

E R

SG

B

P

-0

W

O R

K L

O C

A

TI

O N

O

FF

U

TT

A

FB

, N E

C O

N S

TR

U

C

TI

O N

C O

S T

E S

TI

M

A

TE

B R

E A

K D

O W

N

LI

N

E N

O

IT

E

M

(1

U N

IT

O

F M

E A

S U

R E

(2

M A

TE

R

IA

L

(4

LA

B

O R

(5

TO

TA

L U

N

IT

S

T

(8

U N

IT

C

O S

T

(9

LI

N

E

TO

TA

L

(1 0)

Q

TY (3

LA

B

O R

(7

TO

TA

L C

O S

TS

M A

TE

R

IA

L

(6

FO

U

O Pa ge

FO

U

O

FA460025R0002

EL

EC

TR

IC

A

L

D iv

. 2

- S ta gi ng

/M ob iliz at io n

EA

$0 .0

$6

,2

.0

$0 .0

$6

,2

.0

$6 ,2

0.

$6

,2

D iv . 2

- b ra nc h ci rc ui tin g

EA

$7 5, 0.

$3

2, 0.

$7 5, 0.

$3

7, 0.

$1

,5

0.

$1

,5

D iv . 2

- f ire a la rm c on ne ct io ns

EA

$3 ,5

.0

3, 0.

$3

,5

.0

$3 ,5

.0

$7

,0

0.

$7 ,0

To ta l M at er ia l C os ts $7

8, To ta l L ab or

C os ts $4

7, To ta l O th er

D ire ct C os ts

$0

To ta l M at er ia l T ax

7.

5%

$5 al

D ire ct C os ts

$1

,6

O ve rh ea d

$1

9, Su bt

,3

Pr of it

$1

5, TO

TA

L

PR

IC

E $1

,5

C O

N

TR

A C re ss

C O

N

TR

A C

T

FO

R (W or k to b e pe rfo rm ed

R ep ai r H

V A

C , B

P R

O P

O S

E D

T O

TA

L

C O

N

TR

A C

T P

R

IC

E

P U

R C

H A

S E

R E

Q U

E S

T N

U M

B E

R

P R

O

JE

C T

N U

M B

E R

S G

B P

2-

W O

R K

L O

C A

TI

O

N O

FF

U

TT

A

FB

, N

E

C O

N S

TR

U

C

TI

O N

C O

S T

E S

TI

M

A

TE

B R

E A

K D

O W

N

LI

N

E N

O

IT

E

M

(1

U N

IT

O

F M

E A

S U

R E

(2

M A

TE

R

IA

L

(4

LA

B

O R

(5

TO

TA

L

(8

U N

IT

C

O S

T

O

TH

E R

D

IR

E C

T C

O S

TS

E

Q U

IP

M

E N

T

(9

LI

N

E

TO

TA

L

(1 0)

Q

TY (3

LA

B

O R

(7

TO

TA

L C

O S

TS

M A

TE

R

IA

L

(6

FO

U

O Pa ge

FO

U

O

FA460025R0002

TE

IM

PR

O

VE

M

EN

TS

Se ed in g

SY

$4 .5

$2

,5

.0

$0 .0

$2

,5

0.

$2 ,5

Er os io n C on tro l B la nk et

SY

$4

.0

$2 ,2

.0

$0

.0

$2 ,2

0.

$2

,2

To ta l M at er ia l C os ts $4

,7

To ta l L ab or C os ts

$0 To ta l O th er

D ire ct C os ts

$0

To ta l M at er ia l T ax

7.

5% al D ire ct

C os ts $5

,1

O ve rh ea d

$7

Su bt

$5

Pr of it

$5

TO

TA

L

PR

IC

E

$6 ,4

C O

N

TR

A C re ss

C O

N

TR

A C

T

FO

R (W or k to b e pe rfo rm ed

R ep ai r H

V A

C , B

P R

O P

O S

E D

T O

TA

L

C O

N

TR

A C

T P

R

IC

E

P U

R C

H A

S E

R E

Q U

E S

T N

U M

B E

R

P R

O

JE

C T

N U

M B

E R

S G

B P

2-

W O

R K

L O

C A

TI

O

N O

FF

U

TT

A

FB

, N

E

C O

N S

TR

U

C

TI

O N

C O

S T

E S

TI

M

A

TE

B R

E A

K D

O W

N

LI

N

E N

O

IT

E

M

(1

U N

IT

O

F M

E A

S U

R E

(2

M A

TE

R

IA

L

(4

LA

B

O R

(5

TO

TA

L

(8

U N

IT

C

O S

T

O

TH

E R

D

IR

E C

T C

O S

TS

E

Q U

IP

M

E N

T

(9

LI

N

E

TO

TA

L

(1 0)

Q

TY (3

LA

B

O R

(7

TO

TA

L C

O S

TS

M A

TE

R

IA

L

(6

FO

U

O Pa ge

FO

U

O

FA460025R0002

IV. MEETING MINUTES

MEETING MINUTES

65% REVIEW

PROJECT:

OFFUTT AFB

UPGRADE HVAC B1226

SGBP-22-0041

HGM PROJECT NO: 740422

DATE: May 15, 2024 TIME: 2:30 PM

LOCATION: Virtual Microsoft Teams Meeting

ATTENDEES: Bill Glismann, HGM Associates; Matt Kasprzak, Morrissey Engineering; Larry Rock, SrA Jarred Julian, Offutt AFB.

ITEMS DISCUSSED:

1. Attendees went through Review Comments received from the 90% review. Comment and Response sheets are attached.

Please submit comments, additions, or corrections to this memo within five (5) days of issuance.

If no comments are received this memo will be assumed accurate.

COPY TO: All attendees.

REPORT BY: William Glismann, P.E.

65% REVIEW

UPGRADE HVAC B1226

SGBP-22-0041

HGM PROJECT NO: 740422

DATE: February 23, 2023 TIME: 10:00 AM

LOCATION: B301D, 3rd Floor, CES/CEN Glass Block Conf Room

ATTENDEES: See Attached Attendance Sheet

ACTION ITEMS:

1. Anna to coordinate with HVAC shop to get MEI access to tunnel to field verify ducts.

2. Anna to provide MEI with a spec for cleaning the ductwork.

3. MEI to send Larry room numbers to markup.

4. MEI to provide responses to unanswered comments.

5. Justin will reach out to B1226 users to get estimates of actual user capacities.

ITEMS DISCUSSED:

1. Attendees went through Review Comments received from the 65% review. Comment and Response sheets are attached.

2. Attendees discussed the analysis of the well field, (see comment #15 from Anna Mosier).

OAFB does not have trending data for the system. MEI will look into using the data they have to make a quantitative estimate of the current load capacity. Official response to be provided.

3. OAFB inquired whether drilling a new test well would be beneficial. MEI stated the tests completed by K2 serve the same function that drilling a new test well would. SO a new test well would not be beneficial.

Please submit comments, additions, or corrections to this memo within five (5) days of issuance.

If no comments are received this memo will be assumed accurate.

COPY TO: All attendees.

REPORT BY: Ryan Wood, P.E.

FA460025R0002

Repair HVAC B1226

65% Review Meeting

FEB. 23, 2023

Name Company Phone Email

Bill Glismann HGM 402-346-7559 bglismann@hgmonline.com

Ryan Wood HGM 402-504-8077 rwood@hgmonline.com

Larry Rock 55 CES 402-294-4213 Larry.rock.1@us.af.mil

Matt Kasprzak MEI 402-714-6248 mkasprzak@morrisseyengineering.

com

Anna Mosier 55 CES 402-232-5725 Anna.mosier@us.af.mil

Justin Robinson 55 CES justin.robinson.29.ctr@us.af.mil

FA460025R0002

Attachment 15 mailto:bglismann@hgmonline.com mailto:rwood@hgmonline.com mailto:Larry.rock.1@us.af.mil mailto:mkasprzak@morrisseyengineering.com mailto:mkasprzak@morrisseyengineering.com mailto:Anna.mosier@us.af.mil

35% REVIEW

UPGRADE HVAC B1226

SGBP-22-0041

HGM PROJECT NO: 740422

DATE: October 11, 2022 TIME: 1:00 PM

LOCATION: B301D, 3rd Floor, CES/CEN Glass Block Conf Room

ATTENDEES: See Attached Sign In Sheet

ITEMS DISCUSSED:

1. Attendees went through Review Comments received from the 35% review. Comment and

Response sheets are attached.

2. Fire department has no comments at this time.

3. HGM will bring up extra testing to Connelly to see if it can be “reimbursable” or if we need a scope modification.

4. It is unknown whether this work will affect existing duct detectors at this time. If there are any duct detectors that will be impacted, they will be replaced. Morrissey plans to investigate this during their site visit on 10/13/2022.

5. Existing fire alarm system can be upgraded to meet current standards of safety and NFPA code requirements. However, it wasn’t part of the original scope. Anna plans to look to see if it can be added to the scope.

6. Morrissey will verify locations of thermostat later this week during their site visit on

10/13/2022.

7. Noted return grill in hallway on west side of basement level should have airflow direction arrow pointing towards the grill, not away.

Review Meeting Minutes Offutt AFB Renovate 334 TRS GASNT, B500 August 1, 2022

8. Noted RFI asks to confirm delivery pressure of existing natural gas system. Pressure is confirmed at 20-25 psi to the building, down to 2 psi to building interior.

9. Item 8 says “humidification allowed to maintain up to 30% max”, when the cooling design condition is already stated to be 75 F DB at 50% RH. Clarification from Morrissey, 30% is the expected percentage in the Winter months only. This will be updated in the Design Analysis.

10. Noted recommend accepting variance for existing OA intake height.

11. Recommend further examination of ways to replace OA intake with larger OA duct to meet economizer requirements before resorting to variance. Morrissey will investigate this and will have a better idea after this week’s field investigation.

12. Noted paragraph on ductwork sizing and insulation mentions liner. No interior ductwork lining is allowed.

13. RFI #1 – recommend full replacement, or at least replacement of accessible piping in mech areas. Offutt will be producing an official response to RFIs (ALL). Larry agrees with Anna but wants to see how much they will be willing to spend.

14. Yes, RFI #2 - recommend replacement.

15. RFI #3 - occupancy load for some offices seems high and for assembly room 103 seems low, based on IBC limits and square feet. Morrissey will provide what the mech code has for recommendations. Offutt will provide to building users for verification (spreadsheet form).

16. RFI #4 – the insufficiencies are only noted for “the building in general”, with the exception of specific issues most likely related to a heat pump being completely non-function for periods of time. Matt requested trending data with loop temperatures. Anna will look in to

it. Elisa mentioned specific issues with the sanctuary and annexes. She mentioned the offices have also been bad the last few months.

17. RFI #6 – a new glycol feed system would be welcome, but isn’t strictly required if costs are an issue. They’d prioritize replacing the pipes over glycol. Glycol can be an “add alternate” RFI (on the spot). It is unlikely there is any glycol currently in the system. HGM to ask K2 whether to they had put glycol or water back.

18. Construction scope needs to include testing of the fire alarm system for full functionality, especially after all HVAC controls (including zone controls) are replaced. Notes should be included in the dwgs to this effect, as it ties into the new equipment. This will be added to specifications.

19. Noted arrows to exhaust grills should be pointing toward grills, not away.

20. Ductwork from HPs to south/east side of main chapel will be shown and added.

Review Meeting Minutes Offutt AFB Renovate 334 TRS GASNT, B500 August 1, 2022

21. MD2.1 seems a bit redundant to MD1.1 at the time. If MD2.1 stays the same it can be consolidated into MD1.1.

22. Noted new air separator / exp tank currently looks like old one is retained.

23. Piping Schematic should be labeled piping schematic, with note underneath to indicate that the hatched area is to be removed and replaced. Morrissey will add more information to this detail.

24. Noted for the 65% Offutt will need to see the HVAC calculations and analysis of the wellfield, as well as have controls schematics and sequence of operations included in the dwgs. As an appendix to the P.A., list assumptions, room numbers, etc.

25. Discussed that the OPC is within costs.

26. Offutt would give us NTP if Connelly was in attendance, but he will email it.

27. Slide 65% date back preferred over a 65% submittal with less information. Move 65% back to end of November with holding 90% and 100%.

28. K2 will likely be able to get to the site the last week of October for additional well field testing. Test results would be available 1 week later.

29. HGM to send new schedule to Connelly.

30. Offutt would prefer to stay with Honeywell system with backnet.

31. Morrissey to visit the site at 9am Thursday, 10/13/2022.

Please submit comments, additions, or corrections to this memo within five (5) days of issuance.

If no comments are received this memo will be assumed accurate.

COPY TO: All attendees.

REPORT BY: Ryan Wood, P.E.

FA460025R0002

V. 35% REVIEW COMMENTS & RESPONSES

OFFUTT AFB ENGINEERING REVIEW COMMENTS DATE Page 1 of 1 pages

Project Number: SGBP 22-0041 Title: Repair HVAC, B1226 Status: 35 % Design

Reviewed by: Philip Post

Philip.post@us.af.mil

55 CES/CEOFA

Offutt AFB NE 68113-4019

Voice 402 294-9722

Reference Cmt

COMMENT RESPONSE

1 Will this work affect existing duct detectors on supply and return ductwork

If a duct detector is installed in ductwork that is being removed/replaced, then the duct detector would also be replaced.

2 Existing fire alarm system is past serviceable life.

Could it be upgraded to meet current standards of safety and NFPA code requirements?

A fire alarm upgrade/replacement is not part of the scope of work.

OF FORM 1

DRAWING or

PARAGRAPH # CMT # COMMENTS RESPONSE

DSN: COM:

IFB

NAME OF REVIEWER ORGANIZATION / SECTION PHONE NUMBER FTS:

DD FORM 1391 DRAFT RFP INT RFP 35% SUBMITTAL 60% SUBMITTAL 90% SUBMITTAL

PAGES

BASE

FY

Offutt AFB, NE

PROJECT TITLE PROJECT NUMBER

ENGINEERING REVIEW COMMENTS DATE

PAGE of9/26/22

B1226, Repair HVAC 22-0041 2022

Anna Mosier CEOER

MD1.0

DA pdf pg 7

DA pdf pg 9

DA pdf pg

DA pdf pg

DA pdf pg

Return grill in hallway on west side of basement level should have airflow direction arrow pointing towards the grill, not away.

RFI asks to confirm delivery pressure of existing natural gas system. Pressure is confirmed at 20-25 psi to the building, down to 2 psi to building interior.

Item 8 says "humidification allowed to maintain up to 30% max", when the cooling design condition is already stated to be 75 F DB at 50% RH. Is the 30% for heating conditions? If so, why is it phrased as "up to". Does this mean something else?

Recommend accepting variance for existing OA intake height

Recommend further examination of ways to replace OA intake with larger OA duct to meet economizer requirements before resorting to variance

Paragraph on ductwork sizing & insulation mentions liner.

No interior ductwork lining is allowed. Please revise.

RFI #1 - recommend full replacement, or at least replacement of accessible piping in mech areas

RFI #2 - recommend replacement

RFI #3 - we need to see your assumptions and referenced limits for these areas - occupancy load for some offices seems high and for assembly room 103 seems low, based on IBC limits and sq ft I'm looking at

RFI #4 - the insufficiencies are only noted for "the building in general", with the exception of specific issues most likely related to a heat pump being completely non-functional for periods of time (ex: the choir)

RFI #6 - a new glycol feed system would be welcome, but isn't strictly required if costs are an issue

1. We will correct the direction of the arrow.

2. Acknowledged.

3. 30% is the humidity level in heating. We will clarify in the next submission.

4. Acknowledged.

5. We will do further investigation on the implications of adding economizer.

6. Acknowledged, duct liner will be removed.

7. Acknowledged.

8. Acknowledged.

9. See attached Spreadsheet showing IMC Ventilation occupancy densities and assumed densities for comment.

10. Acknowledged, CE to look into available trending data.

11. Will include feed system as bid alternate.

1 2

232-5725

FA460025R0002

PARAGRAPH # CMT # COMMENTS RESPONSE

DSN: COM:

IFB

NAME OF REVIEWER ORGANIZATION / SECTION PHONE NUMBER FTS:

DD FORM 1391 DRAFT RFP INT RFP 35% SUBMITTAL 60% SUBMITTAL 90% SUBMITTAL

PAGES

BASE

FY

Offutt AFB, NE

PROJECT TITLE PROJECT NUMBER

ENGINEERING REVIEW COMMENTS DATE

PAGE of9/26/22

B1226, Repair HVAC 22-0041 2022

Anna Mosier CEOER

General

MD1.1,

M1.0, M1.1

MD1.0

MD2.1

M2.0

M3.0

General construction scope needs to include testing of the fire alarm system for full functionality, especially after all HVAC controls (including zone controls) are replaced.

Notes should be included in the dwgs to this effect.

arrows to exhaust grills should be pointing toward grills, not away ductwork from HPs to south/east side of main chapel needs to be shown

MD2.1 seems a bit redundant to MD1.1 at the time.

Could the little new info on MD2.1 be consolidated onto MD1.1?

Please indicate new air separator / exp tank on this -currently looks like old one is retained

Piping Schematic should just be labeled piping schematic, with note underneath to indicate that the hatched area is to be removed and replaced. Else, we need a separate new piping schematic to match this

For the 65% we'll need to see the HVAC calculations and analysis of the wellfield, as well as have controls schematics and sequence of operations included in the dwgs

12. Noted. This will be added to the specifications.

13. We will correct the direction of the arrow.

14. The ductwork will be added for the next submission.

15. The two sheets will be combined in a later submission if information displayed remains minimal.

16. A new air separator and expansion tank shall be included in the design. Drawings will be updated as progress continues.

17. Piping schematic is in progress, further details and notes will be added as the project progresses.

18. Acknowledged.

2 2

232-5725

FA460025R0002

PARAGRAPH # CMT # COMMENTS RESPONSE

DSN: COM:

IFB

NAME OF REVIEWER ORGANIZATION / SECTION PHONE NUMBER FTS:

DD FORM 1391 DRAFT RFP INT RFP 35% SUBMITTAL 60% SUBMITTAL 90% SUBMITTAL

PAGES

BASE

FY

Offutt AFB, NE

PROJECT TITLE PROJECT NUMBER

ENGINEERING REVIEW COMMENTS DATE

PAGE of27Sept22

Repair HVAC 22-0041 22

FIRE DEPARTMENT HAS NO COMMENTS AT THIS

TIME

Acknowledged.

1 1

FA460025R0002

of PAGES11ENGINEERING REVIEW COMMENTS

DATE

22-Sep-2022

PAGE

90% SUBMITTAL IFBDD FORM 1391 PROJECT BOOK

FY 22

CONCEPT 35% SUBMITTAL 65% SUBMITTAL

BASE

Offutt AFB

PROJECT TITLE

Repair HVAC, B1226

PROJECT NUMBER

SGBP 22-0041

RESPONSECOMMENTS

All The next drawing number that can be used for this project is OFF-B-6489. Acknowledged.

DSN: 294-3296

DRAWING or

PARAGRAPH #

CMT #

ORGANIZATION / SECTION

CES CEPT COM:

FTS:

Chris Hansen

PHONE NUMBERNAME OF REVIEWER

OF FORM 1

FA460025R0002

VI. 65% REVIEW COMMENTS & RESPONSES

PARAGRAPH # CMT # COMMENTS RESPONSE

DSN: COM:

IFB

NAME OF REVIEWER ORGANIZATION / SECTION PHONE NUMBER FTS:

DD FORM 1391 DRAFT RFP INT RFP 35% SUBMITTAL 60% SUBMITTAL 90% SUBMITTAL

PAGES

BASE

FY

Offutt AFB, NE

PROJECT TITLE PROJECT NUMBER

ENGINEERING REVIEW COMMENTS DATE

PAGE of

FA460025R0002

Attachment 15

MKasprzak Text Box MEI will updated.

MEI will add note to scope the existing sanitary lines first, and snake if required. Will include note disallowing water jetting.

MEI shall include notes to provide complete testing of fire alarm system for proper integration of new components added / replaced during this project.

MEI has requested access to tunnels to verify existing conditions. Existing drawings do not indicate ductwork.

MEI concurs, will update and make enlarged plan for better detail.

MEI will add to detail.

PARAGRAPH # CMT # COMMENTS RESPONSE

DSN: COM:

IFB

NAME OF REVIEWER ORGANIZATION / SECTION PHONE NUMBER FTS:

DD FORM 1391 DRAFT RFP INT RFP 35% SUBMITTAL 60% SUBMITTAL 90% SUBMITTAL

PAGES

BASE

FY

Offutt AFB, NE

PROJECT TITLE PROJECT NUMBER

ENGINEERING REVIEW COMMENTS DATE

PAGE of

FA460025R0002

Attachment 15

MKasprzak

MEI - Will updated, all new control system.

MEI - Will updated narrative.

MEI - We will investigate the feasibility of adding economizer function to groups of HPs serving a common space. OAFB has approved the variance for OA intakes below 10'.

MEI - We can add a column to the tables to clarify the existing nomenclature vs. the new nomenclature. We will also look to make it more intuitive.

MEI - We will take a closer look at airflows and make recommendations if ductwork sizing needs to be adjusted, or if assumptions driving the capacity are inaccurate based on occupancy feedback, once provided.

In regards to HP10a-e, we had a typo on the new supply air flow.

MEI - We will add a note regarding ductwork cleaning. OAFB will provide spec on ductwork cleaning.

PARAGRAPH # CMT # COMMENTS RESPONSE

DSN: COM:

IFB

NAME OF REVIEWER ORGANIZATION / SECTION PHONE NUMBER FTS:

DD FORM 1391 DRAFT RFP INT RFP 35% SUBMITTAL 60% SUBMITTAL 90% SUBMITTAL

PAGES

BASE

FY

Offutt AFB, NE

PROJECT TITLE PROJECT NUMBER

ENGINEERING REVIEW COMMENTS DATE

PAGE of

FA460025R0002

Attachment 15

MKasprzak

The DA has been updated with additional information and calculations.

MEI - Noted, we will proceed with the assumption of no trending data.

MEI - Will get information from testing company on reason testing showed "failed".

PARAGRAPH # CMT # COMMENTS RESPONSE

DSN: COM:

IFB

NAME OF REVIEWER ORGANIZATION / SECTION PHONE NUMBER FTS:

DD FORM 1391 DRAFT RFP INT RFP 35% SUBMITTAL 60% SUBMITTAL 90% SUBMITTAL

PAGES

BASE

FY

Offutt AFB, NE

PROJECT TITLE PROJECT NUMBER

ENGINEERING REVIEW COMMENTS DATE

PAGE of2/17/2023

22-0041 Repair HVAC, B1226 22-0041 22

Justin Robinson 55 CES (R2C Inc.)

402-294-7605

Specs

Plan Drawings DA, pg. 14, list no. 8

DA, pg. 14, list no. 11 DA, pg. 14, list no. 13 DA, pg. 14, list no. 15

DA, pg. 15, paragraph 1 DA, pg.

15-16

Much of the specs haven't been edited. For next submittal, edit the specs and provide a revision-tracked copy of specs in addition to black-line specs.

Number the rooms in the plan-view drawings.

Need to check on whether humidification is required.

UFC 3-410-01 requires the following in 3-5.3.3:

"provide humidification where the indoor relative humidity for comfort heating is expected to fall below 30 percent at design conditions. Coordinate with the architect to design the building envelope to prevent condensation in the wall/roof systems during the time humidification is in operation. Include in the design analysis a dew point analysis profile (ASHRAE Fundamentals Chapter 23) for winter design conditions, showing condensation boundaries. The dew point analysis must consider the effect of air movement into the walls for buildings under positive pressurization relative to the outdoors."

Update calculations using ASHRAE 62.1-2016 (per

UFC 3-410-01).

Update calculations to use ASHRAE 90.1-2013 (per

UFC 3-410-01).

Where do these building envelope assumptions come from? Include justification for all assumptions made in

DA.

Use ASHRAE 62.1-2016 to determine ventilation rates.

(per UFC 3-410-01).

Explain rationale (including any calculations) for assumptions made.

1…