WAP Energy Audit - Alamosa Apartments - Preliminary Report_091124.pdf

1325 East 16th Avenue Denver, CO 80218

(303) 861-2070 group14eng.com

Alamosa Plaza Apartments

Energy Outreach Colorado Multifamily Weatherization Audits

9/11/2024

PREPARED BY:

Erik Swanton PE, CxA eswanton@group14eng.com

ENERGY OUTREACH COLORADO MULTIFAMILY WEATHERIZATION AUDITS

TABLE OF CONTENTS

1 EXECUTIVE SUMMARY

2 EXISTING BUILDING CONDITIONS

2.1 Building Description

2.2 Building Envelope

2.2.1 Wall Insulation

2.2.2 Attic Insulation

2.2.3 Thermal Boundary

2.2.4 Envelope Energy Modeling

2.2.5 Health and Safety Inspection

2.3 Lighting

2.3.1 Common Area Lighting

2.3.2 Exterior Lighting

2.3.3 In-Unit Lighting

2.3.4 Lighting Inventory

2.4 Major Mechanical Systems & Controls

2.4.1 Central Heating Plant

2.4.2 In-Unit Heating, Cooling, and Ventilation

2.4.3 Common Area Heating, Cooling, and Ventilation

2.4.4 Domestic Hot Water

2.4.5 Mechanical Equipment Inventory

2.5 Equipment Testing and Records

2.6 Mold Inspection

3 RECOMMENDED ENERGY EFFICIENCY MEASURES

3.1 In-Unit Lighting Retrofit

3.2 Common Area Lighting Improvements

3.3 Install High-Efficiency (Low-Flow) Water Fixtures

3.4 Replace Central Heating Boiler with Modulating Condensing Boiler and Indirect Domestic Hot Water

3.5 Domestic Hot Water Heater Upgrade to High Efficiency Condensing Units

3.6 Hot Water Pipe Insulation

3.7 Programmable Wall Mounted Thermostats

3.8 Replace Windows

3.9 Exterior Insulation and Finish System (EIFS)

3.10 Increase Attic Insulation

3.11 Replace Inefficient Refrigerators

4 EFFICIENCY MEASURES NOT RECOMMENDED

4.1 Exterior Lighting Improvements

4.2 Install Solar Photovoltaics

5 RECOMMENDED HEALTH & SAFETY MEASURES

5.1 Replace Non-Functional or Low Flow Bathroom Exhaust Fans

5.2 Install Hardwired Combination Smoke/Carbon Monoxide Alarms

APPENDIX A – SPECIFICATIONS (PROVIDED SEPARATELY) ....................... I

APPENDIX B – ONE-LINE DIAGRAMS ............................................................. II

APPENDIX C – DOE-2 DOCUMENTATION (PROVIDED SEPARATELY) ........ III

APPENDIX D – AUDITOR NOTES (PROVIDED SEPARATELY) ...................... IV

APPENDIX E – SITE AUDIT PHOTOS (PROVIDED SEPARATELY) .............. VII

APPENDIX F – HEALTH AND SAFETY CHECKLIST ..................................... VIII

1 EXECUTIVE SUMMARY

Group14 has completed an energy audit of the south building at Alamosa Plaza Apartments, a site consisting of four garden-style apartment buildings with a central courtyard. The scope of the energy audit and this report is only the south building located at 2069 Mullins Ave. The building is a two-story, masonry construction with 24 dwelling units and approximately 14,000 square feet. There are mostly just residential units accessed from an exterior walkway, but there is also a common laundry room, mechanical room, and a storage area.

Alamosa Plaza Apartments has hydronic baseboard heating controlled by in-unit, non-programmable thermostats with heating provided by a central boiler plant. There is no cooling in the building, and in-unit ventilation is provided by bathroom exhaust fans, and operable windows. Domestic hot water for the units and common laundry machines is provided by a standalone gas-fired water heater in the mechanical room.

Building and utility data were compiled and entered into EnergyPlus modeling software.

Fuel Annual Use Annual Cost

Electric (kWh) 6,157 $ 1,009.23

Gas (Therms) 17,200 $ 16,743.69

Total $ 17,752.92

Table 1 - Historical Energy Use Summary

Building envelope, HVAC, lighting, potable water, and control systems were analyzed for opportunities to improve efficiency and address health and safety issues. Specific details of savings calculations will be provided in subsequent reports.

The Energy Efficiency Measures (EEM) that were determined to meet Department of Energy (DOE) criteria for Weatherization Assistance Program (WAP) funding are presented in the table below:

Energy Efficiency Measure 1st Year Savings SIR

In-Unit Lighting Improvements TBD TBD

Common Area Lighting Improvements TBD TBD

High Efficiency Water Fixtures TBD TBD

Space Heating Boiler Upgrade TBD TBD

Standalone DHW Upgrade TBD TBD

Hot Water Pipe Insulation TBD TBD

Programmable Thermostats TBD TBD

Window Replacement TBD TBD

Exterior Rigid Insulation (EIFS) TBD TBD

Increase Attic Insulation TBD TBD

Refrigerator Upgrade TBD TBD

Package TBD TBD

Table 2 - EEM Summary

EEMs that were determined not to meet DOE WAP criteria are not recommended at this time:

Energy Efficiency Measure 1st Year Savings SIR

Exterior Lighting Improvements N/A N/A

Rooftop Solar PV N/A N/A

Air Source Heat Pump DHW Upgrade N/A N/A

N/A N/A

Table 3 - Measures Not Recommended

All energy efficiency measures are detailed in the energy model outputs (Appendix C) and Scope of Work Specifications (Appendix A).

In addition to the EEMs presented above, two health and safety measures were documented.

Existing Condition Health and Safety Measure

Bathroom exhaust flow rates are below code minimum.

Clean exhaust ducting and/or install new exhaust fans with where necessary to meet ventilation requirements.

Some units missing smoke and/or carbon monoxide detectors.

Install hardwired combination smoke and CO alarms in each unit.

Table 4 - Health and Safety Measures

The existing building conditions of Alamosa Plaza Apartments are documented in this report. Note that all existing equipment types, quantities, and costs listed in this report are for the purposes of this analysis and should not be used as a basis for contractor bids or construction estimates.

2 EXISTING BUILDING CONDITIONS

2.1 Building Description

Square Footage

14,000 ft2 Lot Description

Level suburban corner lot with 4 apartment buildings around a central courtyard with parking and open space. Additional parking to the south of the building.

Building(s) 1 Unit Description

The building contains (23) 1-Bedroom units, and a single 3-Bedroom unit converted from an old managers office.

Stories 2 Common Spaces

Common laundry, storage and mechanical spaces.

Table 5 - Building Description

The Google Earth image below provides an overhead view of the site.

Figure 1 - Overhead view of Alamosa Plaza Apartments. The highlighted South building was the subject of the energy audit.

2.2 Building Envelope

The south building at Alamosa Plaza Apartments is a two-story, garden-style apartment building with exterior stairs at either end. There is a breeze way passing through the building on the first floor near the center of the building at the mail center.

The building is slab on grade with a pitched composite shingle roof and gable venting for the attic. There is blown cellulose insulation at the ceiling plane in the attic with a single attic access panel on the east gable of the building.

Windows are mostly vinyl double-paned with standard glazing, but there are also some single-paned windows with metal frames on the second floor.

Images of the main east, north, south, and west façades are presented below.

Alamosa Plaza Apartments - South

Figure 2 - East Facade

Figure 3 - West Facade

Figure 4 - Partial South Facade

Figure 5 – Partial North Facade

2.2.1 Wall Insulation

The building is a masonry block construction with no insulation.

2.2.2 Attic Insulation

Attic insulation depths were measured in multiple sections of the attic. The insulation was measured on average to be 9” for an overall R-value of R-32. Insulation levels were generally consistent across the attic space, although there was some indication of compaction down the center of the attic where people had walked through insulation previously.

Figure 6 – Overall attic insulation condition

Figure 7 - Typical attic insulation depth

2.2.3 Thermal Boundary

In the figures below, the redlines denote the boundaries of the conditioned space of the building. The thermal boundaries are uniform, Figure 8 - Typical Gable End thermal boundary

Figure 9 - Typical Noth/South Facade thermal boundary with central breezeway

2.2.4 Envelope Energy Modeling

The table below summarizes the previously discussed information that will be used in the energy modeling for Alamosa Plaza Apartments. Additional modeling details will be included in the final report.

Component Description R-Value / U-Value

Floor Uninsulated Slab on Grade -

Attic / Roof 9” Blown Cellulose R-32

Exterior Walls Uninsulated 8” Masonry Block R-2

Double-Pane Windows Vinyl Frame, Standard Glazing U-0.40

Single-Pane Windows Metal Frame, Standard Glazing U-1.00

Table 6 - Energy Modeling Information

2.2.5 Health and Safety Inspection

A visual inspection was conducted in 100% of the units at Alamosa Plaza Apartments for health and safety concerns. A signed health and safety inspection form can be found in Appendix F.

There were no issues to note in the apartments, but the mechanical room was lacking proper combustion air for the natural gas appliances. The only combustion air opening was the louvered bottom half of the mechanical room door, but this louver was partially covered. Even if the louver was left open, there would still not be enough open area to meet combustion air requirements for the space heating boiler and domestic water heater in the mechanical room. This can cause back drafting of the appliances and higher risk of flue gas spillage into the mechanical room. Additionally, there is an electric dryer installed in the mechanical room which (if operated) would increase back drafting and spillage when the gas appliances were operating.

2.3 Lighting

2.3.1 Common Area Lighting

Common area space at Alamosa Plaza Apartments is minimal, and common area lighting consists of a few fixtures in the Laundry, Mechanical, and Storage spaces. Common area lighting was predominantly fluorescent technology.

2.3.2 Exterior Lighting

Exterior site lighting is provided by fixtures with LED bulbs controlled by a central time clock. There is a combination of surface mounted flood lights on the south walkways and a flush mount ceiling fixture in the breezeway. Entry lighting at each unit is controlled by interior switches and therefore included in the In-Unit Lighting inventory.

2.3.3 In-Unit Lighting

Residential units have a mostly uniform lighting configuration, with most of the fixtures using screw-based bulbs.

Most fixtures have LED bulbs installed, but there are also some CFL lamps and incandescent lamps mixed throughout. The single 3-bedroom unit (Unit 5) has some unique fixtures, which is reflected in the inventory below.

A full lighting inventory of a single building is included below in Table 7.

2.3.4 Lighting Inventory

Lighting Inventory

Tag Fixture Type Lamp / Ballast

Type Lamps per

Fixture Fixtures

Lamp Wattage

Area Served Replace

(Y/N)

COMMON AREA LIGHTING

4SUS-T8 4’ Suspended Strip T8 / Magnetic 2 1 32 Mechanical Y

4SUS-T12 4’ Suspended Wrap T12 / Magnetic 2 1 40 Mechanical Y

SM1-I

Surface Mount Screw Base

Incandescent 1 1 72 Mechanical Y

4STR-T12 4’ Ceiling Mount Strip T12 / Magnetic 2 1 40 Laundry Room Y

EXTERIOR LIGHTING

SM1-L

Surface Mount Screw Base

Screw Base

LED

1 2 8.5 Mail Hallway N

FL2-L Security Flood Light Screw Base

LED

2 7 14 Walkway and

North Overhang N

IN-UNIT LIGHTING

EXT-L Jelly Jar Screw Base

LED

1 12 8.5 Exterior Entry N

EXT-I Jelly Jar Incandescent 1 6 75 Exterior Entry Y

EXT-F Jelly Jar Screw Base

CFL

1 6 13 Exterior Entry Y

SM2-L Surface Mount Screw Base

LED

2 40 8.5 Bedroom, Living Room N

SM2-I Surface Mount Screw Base Incandescent

2 8 60 Bedroom, Living Room Y

SM1-L Surface Mount Screw Base

LED

1 47 8.5 Hallway, Closet N

EF-L Exhaust Fan Screw Base

LED

1 23 8.5 Bathroom 1 N

VAN4-L Vanity Screw Base

LED

4 18 8.5 Bathroom 1 N

VAN4-F Vanity Screw Base

CFL

4 6 13 Bathroom 1 Y

RH-L Range Hood Screw Base

LED

1 18 8.5 Kitchen N

RH-I Range Hood Incandescent 1 6 60 Kitchen Y

SMR2-L

Surface Mount Round

Screw Base

LED

2 23 8.5 Kitchen N

4WRA-T8 4’ Fluorescent Wrap T8 / Magnetic 2 1 32 Kitchen Y

Table 7 - Lighting Inventory

A Sample of lighting photos for the building are presented below. Additional fixture photos may be found in Appendix E.

Common Area Lighting

Figure 10 – Suspended T12 Wrap (4SUS-T12)

Figure 11 - Surface Mount T12 Fixture (4STR-T12)

Exterior Lighting

Figure 12 – Typical LED Security Flood Light (FL2-L)

Figure 13 – Breezeway surface mount fixture (SM1-I)

Exterior Lighting

Figure 14 - Wall Mount Porch Light (EXT)

Figure 15 – Two Bulb Surface Mount (SM2)

In-Unit Lighting

Figure 16 – Single Bulb Surface Mount (SM1)

Figure 17 - Bath Fan (EF)

Figure 18 - Range Hood (RH)

Figure 19 – Four Bulb Vanity (VAN4)

Figure 20 – 3BR Kitchen Light (4WRA-T8)

Figure 21 – Surface Mount Round (SMR2)

2.4 Major Mechanical Systems & Controls

2.4.1 Central Heating Plant

Central Heating: The building is heated by a single natural draft boiler delivering hot water to baseboard radiators throughout the building. For further mechanical details, please see Table 9 below and Table 12 Mechanical Inventory on the following pages.

Space Heating Boiler Plant

Boiler Information Boiler Plant Controls Boiler Pump Information

Manufacturer American Standard Operating

Setpoint:

160F Manufacturer Grundfos

Model G 6010 Outside Air

(OA) Reset:

150F @ 70F OA Model UPS 40-160F

Input Capacity (MBH): 1170 160F @ 68F OA Volume 3-Speed

Output Capacity (MBH): 936 WWSD: None Power 890 W

Fluid Type: Water

Table 8 - Space Heating Boiler and Pump Details

The system operates in constant primary configuration with a Johnson Controls digital controller that enables the boiler to maintain the system heating water temperature. The controller is capable of a warm weather shutdown, but the function is disabled. The system has a single multi-speed pump supplying space heating water throughout the building.

Combustion analysis was performed on the space heating boiler and the domestic water boiler in the mechanical room (see Section 2.5).

2.4.2 In-Unit Heating, Cooling, and Ventilation

In-Unit Heating and Cooling: Each unit at Alamosa Plaza Apartments has hydronic baseboard heating controlled by an electronic, two-way zone valve and in-unit non-programmable analog thermostat. There is no cooling provided at the building.

In-Unit Ventilation: In-unit ventilation is provided by operable windows and bath exhaust fans. Range hoods located above the stove are recirculating fans without exhaust.

2.4.3 Common Area Heating, Cooling, and Ventilation

Common Area Heating: Heating in the common laundry room is provided by hydronic baseboard heat, served by the central boiler.

Common Area Cooling: There is no cooling in the common areas.

Common Area Ventilation: There is no ventilation in the common areas.

2.4.4 Domestic Hot Water

Domestic hot water for the apartments and central laundry room is provided by a central natural gas fired water heater in the mechanical room. The heater has a natural draft burner, motorized flue damper, and was installed in 2014. Piping for the domestic hot water system is uninsulated.

For further mechanical details, please see Table 11 below and Table 12 Mechanical Inventory.

Domestic Hot Water System

DHW Heater Recirculation

Pump

Thermostatic

Mixing Valve

Type: Non-Condensing Constant Speed N/A

Manuf.: Bradford White Grundfos -

Model: D75T3003NA UP 26-99BF -

Efficiency: 80% - -

Capacity: 300 MBH (Input) 245 W -

Setpoint: 130F - -

Table 9 - DHW Equipment Details

2.4.5 Mechanical Equipment Inventory

Mechanical Inventory

Tag Service Make Model # Capacity / Setpoint Age

B-1 Baseboard Heat American Standard G 6010 1170 MBH (In), 936 MBH (Out) 1968

P-1 Boiler Pump Grundfos UPS 40-160F 890 W 2023

ET-1 Boiler Expansion Tank Amtrol AX60V 33.6 Gal 2023

DHW-1 Domestic Hot Water Bradford White D75T3003NA 300 MBH (Input) 2014

P-2 DHW Recirculation Grundfos UP 26-99BF 245 W 2012

Table 10 - Mechanical Equipment Inventory

Photos of the major mechanical equipment are shown below. Additional photos are included in Appendix E (separate file).

Mechanical Equipment

Figure 22 - Space Heating Boiler

Figure 23 - Space Heating Circulation Pump

Figure 24 – DHW Heater

Figure 25 - DHW Recirculation Pump

Typical In-Unit Equipment

Figure 26 - Typical Non-Programmable Thermostat

Figure 27 - Typical In-Unit Baseboard

2.5 Equipment Testing and Records

Combustion gas analysis was completed on all gas appliances. Full results of the combustion analysis of all equipment are provided in Appendix D.

Service Equipment Combustion Efficiency

Space Heating B-1 83.0%

Domestic Hot Water DHW-1 82.6%

Table 11 - Mechanical System Combustion Testing Data

Combustion zone safety testing was completed on all gas appliances in the table above located in the mechanical room. There were no issues to note.

Additionally, exhaust fan testing was performed on 100% of accessible units during the audit. All the exhaust fan terminals were drawing less than 50 cfm, the code minimum bathroom exhaust airflow for intermittent operation. A full listing of results can be found in Appendix D.

2.6 Mold Inspection

A visual mold inspection was conducted in 100% of the units at Alamosa Plaza Apartments. Possible signs of mold or mildew were noted in the following unit(s):

Unit # Location

Table 12 - Locations of Potential Mold

3 RECOMMENDED ENERGY EFFICIENCY

MEASURES

A short narrative of each EEM that meets DOE WAP funding criteria is provided below. More detailed guidance for measure implementation is included in the bid specifications (Appendix A).

3.1 In-Unit Lighting Retrofit

Existing Condition:

Fixtures in the dwelling units have standard screw in base bulbs with a mix of LED, fluorescent, and incandescent bulbs.

Retrofit Incandescent, CFL, and Fluorescent Bulbs to LEDs:

The replacement of all hardwired screw-in incandescent fixture with LED lamps has been evaluated. It is recommended to replace bulbs in all screw-in fixtures with incandescent bulbs with an LED. There is a single T8 fixture in the only 3-bedroom unit which should also be retrofitted with LED lamps.

Estimated bulb replacements per building are shown in the table below:

Table 13 - In Unit Lighting Replacements

Predicted Savings: $TBD SIR: TBD

3.2 Common Area Lighting Improvements

Existing Condition:

Fixtures in common areas are incandescent or linear fluorescent bulbs.

Retrofit Incandescent and Fluorescent Bulbs to LEDs:

Replace hardwired screw-in incandescent fixtures with LED lamps. Also, retrofit LED tubes for all linear fluorescent fixtures.

Estimated bulb replacements are shown in the table below:

Lighting Inventory Tag

Fixture Type Replacement Fixture Replacement Fixture Code

Estimated Bulb Replacements

EXT-I Jelly Jar 9.5W LED Bulb L1-b 6

EXT-F Jelly Jar 9.5W LED Bulb L1-b 6

SM2-I Surface Mount 9.5W LED Bulb L1-b 16

RH-I Range Hood 9.5W LED Bulb L1-b 6

VAN4-F Vanity 9.5W LED Bulb L1-b 24

4WRA-T8 T-8 Ceiling Wrap 4’ 16W Type C LED Tube w/ Remote Driver

RL6 2

Lighting Inventory Tag

Fixture Type Replacement Fixture Replacement Fixture Code

Estimated Replacements

4SUS-T8

T8 Suspended Wrap

4’ 16W Type C LED Tube w/ Remote Driver

RL6 2

4SUS-T12

T12 Suspended Strip

4’ 16W Type C LED Tube w/ Remote Driver

RL6 2

SM1-I Surface Mount 9.5W LED Bulb L1-b 1

4STR-T12 T12 Ceiling Strip 4’ 16W Type C LED Tube w/ Remote Driver

RL6 2

Table 14 - Common Area Lighting Replacements per Building

3.3 Install High-Efficiency (Low-Flow) Water Fixtures

The bathroom faucets, kitchen faucets, and showerheads had a mixture of conventional flow and low flow fixtures.

However, the existing low flow fixtures were generally in poor condition and had been removed at some locations.

Fixtures should be replaced as needed to meet the Recommended Minimum Performance indicated in the table below.

Please note that the number of replacement fixtures are to be verified in the field by the installing contractor due to significant variability in flow rates among units.

Fixture

EPA

Requirements

(GPM)

Recommended Minimum

Performance (GPM)

Anticipated Number to Be

Replaced

Bathroom Faucet 2.0 1.0 24

Shower 2.5 1.5 24

Kitchen Faucet 2.2 1.5 24

Table 15 - Water Fixture Information

3.4 Replace Central Heating Boiler with Modulating

Condensing Boiler

Existing Condition:

Alamosa Plaza Apartments has a single natural draft gas-fired boiler providing heating to hydronic baseboards in the dwelling units and laundry room. The boiler is original to the building and manufactured in 1968. It has a nominal input capacity of 1,170 MBH. The boiler was measured operating around nameplate efficiency of 80%.

For detailed mechanical inventory, please see Table 10.

System piping is a constant primary system, with a single pump circulating water through the boiler and to the hydronic baseboard. There are two-way zone valves in each dwelling unit controlled by a non-programmable wall mounted thermostat.

The system is operated with the following setpoints:

• Heating water supply temperature setpoint of 160°F

• No Warm Weather Shut Down.

• Disabled OA reset (160°F below 68°F outdoor)

The boiler flue terminates on the roof. Piping for space heating in the mechanical room was observed to be copper with no insulation.

The existing combustion air intake is provided by a louver in the bottom half of the mechanical room access door.

However, the louver has been partially sealed at the interior, likely to reduce freezing risks for uninsulated piping in the space. The louver is approximately 30” x 30”.

Efficiency Measure:

The space heating boiler has exceeded its useful life expectancy. It is recommended to replace the existing boiler with two modulating condensing boilers with a minimum 5:1 turndown ratio.

New heat loss calculations shall be performed to determine the necessary capacity of the new boilers without oversizing. The new boilers shall be designed and specified so that each can handle 2/3 of the peak heating load.

New boilers should be plumbed in primary secondary configuration, with a dedicated boiler pump for each boiler.

A new high efficiency building pump shall have an ECM motor or be installed with a variable frequency drive (VFDs) to allow variable speed operation. The new pumps shall be engineered to meet the system flow and pressure requirements. The new pumps shall be controlled to maintain minimum system flows either by utilizing a differential pressure sensor located on the top floor of the building or by utilizing a minimum flow controller. These flows shall be verified by an independent balancer for both part load and full load conditions.

The following provides a schematic of the piping layout for the proposed heating system. Please note that a variable primary with DHW priority is also acceptable if preferred by the contractor.

*Note: Actual piping layout and pumping arrangement to be engineered during the design process and confirmed with the boiler manufacturer.

Figure 28 - Example Space Heating Boiler with Side Arm Tank Piping Diagram

A new boiler control system with an outdoor air sensor shall be installed to operate the boilers and pumps with the following sequence of control:

Enable boilers when the outside air temperature falls below 68 F (adj.). Disable boilers when outside air temperature rises above 72 F (adj.). Stage and modulate boilers using manufacturer’s controls to meet the HWST setpoint. System pumps and primary boiler pumps to be controlled by boiler plant controls.

The HWST setpoint shall be reset according to a linear outdoor air reset schedule in which the design hot water temperature, 160 F (Adj.), is delivered at 5 F (Adj.) outside air temperature and lower, and 130 F

(Adj.) HWS is delivered at the high outdoor air temperature of 60 F (Adj.). This reset shall be optimized to deliver 130F water at the furthest radiator.

Combustion air intakes and flues shall be installed for the new condensing boilers and terminated per the manufacturer’s recommended installation guidelines and/or mechanical design drawings.

The new condensing boilers shall have ducted combustion air as well. Existing combustion air openings can be reduced to meet the requirements of any remaining gas fired appliances in the mechanical room such as the DHW heaters. If the DHW boiler is replaced as part of the recommended efficiency measures, the combustion air openings can be covered.

General Requirements:

Please consider the following while pricing:

1. The Contractor shall be responsible for construction of the installation in its entirety and shall secure the services of qualified professionals as required to complete this scope of work.

2. The capacity of the boilers shall be engineered to match the anticipated space heating loads. A load calculation, piping layout and drawings are part of the design scope of work. The Design/Build installer shall submit all engineering calculations for Owner review and acceptance prior to ordering equipment.

3. The contractor shall provide a fully operational hot water system including but not limited to the electrical work, flues, combustion air, natural gas piping, equipment and piping supports, anchors, pumps, boilers, acid neutralization for condensing equipment drainage, and associated controls. Follow manufacturer’s guidelines for proper installation and venting.

4. The HW boiler controls shall be able to perform the following:

a. Incorporate a warm weather shut down (WWSD) based upon the owner’s preference.

b. Incorporate a HWS reset based upon outside air temperature and owner’s preference. Careful consideration shall be given to the location of the outdoor temperature sensor so that it is sensing true ambient conditions. Reset shall be tuned during cold and warm conditions to provide maximum comfort and efficiency.

c. Contractor shall document all installed setpoints, provide documentation to the Owner, and fully train the Owner on setpoint adjustment.

5. The Contractor shall be responsible for the demolition, removal and proper disposal of all of the existing equipment to be replaced. This includes but is not limited to any regulated materials such as asbestos, lead, etc. Regulated materials shall be disposed of in accordance with local and federal regulations.

6. The Contractor shall secure all permits and inspections required for demolition and installation.

7. The new boilers shall include a factory start-up. This factory start-up shall include at least one return trip for the purposes of tuning and optimizing boiler plant operation.

8. Piping and pumping shall meet the following requirements:

a. The new condensing boilers shall have primary pumps with EC motors capable of varying flow based on delta T. The pump shall start when the associated boiler is called to activate.

b. Insulate all exposed piping.

9. Provide proper venting for condensing boilers. Flue paths should be approved by the owner prior to installation.

10. If applicable, the Contractor shall work with and assist the Owner’s Commissioning Agent to commission the plant operation.

11. Install a means of water treatment and hire a qualified firm to flush and treat the both the newly installed components and hydronic heat piping. The means of water treatment installed shall be based on the results of a water quality test conducted by the contractor or it’s sub and be provided to the Owner and CxA for approval. Consider including a side stream filter or other means of maintaining water quality.

12. One full hard copy of O&M’s shall be present at the site and electronic O&M’s presented to the owner upon completion of the project.

The following specifications apply.

• 220513 - COMMON MOTOR REQUIREMENTS FOR PLUMBING EQUIPMENT

• 232123 – HYDRONIC PUMPS

• 235216 – CONDENSING BOILERS

Improvements to Operations and Maintenance:

New boilers will extend the lifecycle of the plant and will reduce the number of maintenance and repair work orders.

Pricing and Site-Specific Installation Notes to Contractor:

Before final equipment selection, the contractor shall be responsible for load calculation and equipment sizing per specifications. It should be noted that the contractor is ultimately responsible for verifying site conditions.

Contractor will be responsible for issuing a deduction if plant has been reduced significantly in size.

3.5 Domestic Hot Water Heater Upgrade to High Efficiency

Condensing Units

Existing Condition:

Domestic water heating is provided by a packaged tank water heater located in the mechanical room. The water heater is an atmospherically vented unit with 80% thermal efficiency set to 130 °F. There is a single recirculation pump and no mixing valve on the water heater discharge.

Efficiency Measure:

Replace the existing atmospheric water heater with a condensing domestic water heater. The new water heater can be either tank type condensing or a domestic hot water boiler with separate storage tank. Calculations shall be performed to determine the necessary domestic hot water capacity for the current connected hot water loads. Loads may be reduced as new low flow water fixtures are installed.

The combustion air intake and flues for the new water heaters will depend on the manufacturer selected. Ducted combustion air (direct vent) is preferred so there are no openings in the mechanical room that allow cold air to enter. Some condensing water heaters also have a concentric vent/flue option that may allow both the combustion air and flue to go to the roof where the existing flue terminates.

The Contractor shall install, test, and balance z thermostatic mixing valve to temper the domestic hot water to 120°F. The domestic hot water storage tanks should be maintained at 140°F to prevent the risk of Legionella.

Replacement of the DHW recirculation pump should be included in the scope of the upgrade. The new pump shall have an EC motor and be able to automatically adapt its setpoint to adjust to actual system characteristics and sized to meet the calculated pressure loss of the longest piping run.

Figure 29 shows a potential schematic of the piping layout for the proposed system. However, the actual piping layout will be engineered during the design process.

Figure 29 - DHW Potential Schematic

General Requirements

Please consider the following while pricing:

1. The Contractor shall be responsible for the design and construction of the installation in its entirety and shall secure the services of qualified professionals as required to complete this scope of work.

2. The capacity of the domestic water heating plant shall be engineered to match the anticipated domestic hot water loads, considering that all conventional flow fixtures will be replaced with low-flow fixtures. A load calculation, piping layout and drawings are part of the design scope of work. The Design/Build installer shall submit all engineering calculations for Owner review and acceptance prior to ordering equipment.

3. The contractor shall provide a fully operational domestic hot water system including but not limited to the electrical work, flues, combustion air, natural gas piping, equipment and piping supports, anchors, pumps, boilers, acid neutralization for condensing equipment drainage, and associated controls. Follow manufacturer’s guidelines for proper installation and venting.

4. The Contractor shall be responsible for the demolition, removal and proper disposal of all the existing equipment to be replaced. This includes but is not limited to any regulated materials such as asbestos, lead, etc. Regulated materials shall be disposed of in accordance with local and federal regulations.

5. The Contractor shall secure all permits and inspections required for demolition and installation.

6. Piping shall meet the following requirements:

a. One line piping diagram shall be provided to owner prior to ordering any equipment.

b. Insulate all exposed piping.

7. Provide proper venting for the condensing water heater. The combustion air and flues shall be engineered to meet manufacturer’s requirements and code. Flue paths should be approved by the owner prior to installation.

8. If applicable, the Contractor shall work with and assist the Owner’s Commissioning Agent to commission the plant operation.

9. One full hard copy of O&M’s shall be present at the site and electronic O&M’s presented to the owner upon completion of the project.

The following specifications apply.

o 15514 – DOMESTIC WATER HEATERS

Improvements to Operations and Maintenance:

New water heaters will extend the lifecycle of the plant and will reduce the number of maintenance and repair work orders.

Pricing and Site-Specific Installation Notes to Contractor:

Before final equipment selection, the contractor shall be responsible for load calculation and equipment sizing per specifications for domestic hot water plant. It should be noted that the contractor is ultimately responsible for verifying site conditions. The contractor will be responsible for issuing a deduction if plant has been reduced significantly in size.

3.6 Hot Water Pipe Insulation

Existing Condition:

Copper space heating and domestic hot water piping in the mechanical room are uninsulated. The tables to the right show the approximate lengths and diameters of hot water piping in the mechanical room.

Domestic Hot Water (125F)

Total Piping (ft):

25 1/2" dia

10 3/4” dia

35 1-1/2” dia

Uninsulated Piping (ft):

25 1/2" dia

10 3/4” dia

35 1-1/2” dia

Space Heating (140F)

Total Piping (ft):

20 1/2” dia

60 1-1/2” dia

10 2” dia

Uninsulated Piping (ft):

20 1/2” dia

60 1-1/2” dia

10 2” dia

Table 16 - Hot Water Pipe Insulation

Efficiency Measure:

All hot water piping accessible in the mechanical room should be insulated with faced fiberglass pipe insulation per local code requirements or 2018 IECC requirements, whichever is greater:

• Space Heating Piping:

Conductivity - 0.25-0.29 btu•in/h•ft2•ºF (Rated at 125ºF) <1-1/2”ø – 1.5” of insulation ≥1-1/2”ø – 2” of insulation

• DHW Piping:

Conductivity – 0.21-0.28 btu•in/h•ft2•ºF (Rated at 120ºF) <1-1/2”ø – 1” of insulation ≥1-1/2”ø – 1-1/2” of insulation

Improvements to Operations and Maintenance:

Insulation of piping will reduce energy waste and increase comfort in mechanical spaces for maintenance teams working on equipment.

Pricing and Site-Specific Installation Notes to Contractor:

The Contractor shall be responsible for the design and construction of the installation in its entirety and shall secure the services of qualified professionals as required to complete this scope of work.

3.7 Programmable Wall Mounted Thermostats

Existing Condition:

Hydronic baseboard radiators throughout the building are controlled by non-programmable analog thermostats.

Efficiency Measure:

Replace an estimated 25 wall-mounted, non-programmable thermostats with programmable thermostats. This includes dwelling units and the common laundry room. The contractor should verify thermostat counts prior to ordering any equipment.

The contractor shall provide simplified training materials to teach management and residents how to operate and program their new thermostat.

3.8 Replace Windows

Single-pane, metal frame windows with no Low-E coating were observed on the north side of all second story apartment units.

Efficiency Measure:

Replace windows with new ENERGY STAR rated double pane vinyl frame windows with Low-E coating. Windows shall meet all local code requirements and have a maximum U-value of 0.30.

Improvements to Operations and Maintenance:

New windows will provide improved comfort for residents, in addition to increasing the performance of the thermal envelope of the building.

Pricing and Site-Specific Installation Notes to Contractor:

The Contractor shall be responsible for the installation in its entirety and shall secure the services of qualified professionals, as required, to complete this scope of work.

3.9 Exterior Insulation and Finish System (EIFS)

The building is masonry construction without any insulation.

Efficiency Measure:

Install an exterior insulation and finish system (EIFS) with at least 2” of rigid insulation. The insulation should have a minimum R-value of R-4 per inch.

Pricing Notes:

Price an add-alternative of additional insulation values up to 4” of insulation based.

3.10 Increase Attic Insulation and Improve Air Sealing

There were 9” of blown cellulose insulation on average in the vented attic area, for a nominal R-value of approximately R-32. The insulation appeared to be generally even and uniformly installed.

Efficiency Measure:

Seal any gaps or cracks in the ceiling plane drywall from the attic side to reduce air infiltration from conditioned space into the attic. Additionally, increase existing attic insulation to at least R-49 by blowing loose-fill cellulose insulation in addition to existing insulation.

General Requirements:

A completed and signed “Certificate of Insulation” must be posted if insulation is installed. Certificate must include insulation type, coverage area, R-value, and installed thickness. Insulation must be installed in such a manner that ensures complete coverage at the thermal boundary and a consistent R-value, except where physical constraints may exist. Installation must be within 10% of the estimate. Lesser or greater amounts must be documented and must be reasonable.

3.11 Replace Inefficient Refrigerators

Existing Condition:

Current refrigerators range in age, but they are all energy efficient models with estimated annual electric consumption of approximately 350 kWh/yr each.

Efficiency Measure:

Replace older, inefficient refrigerators with an energy consumption of 650 kWh/year or greater with ENERGY STAR-qualified refrigerators rated at an annual energy consumption of 330 kWh or less.

4 EFFICIENCY MEASURES NOT RECOMMENDED

4.1 Exterior Lighting Improvements

Efficiency Measure:

Replace exterior lighting with LED fixture replacements.

Reason Not Recommended:

High efficiency LED fixtures are already installed for exterior lighting. Further improvements would not have any significant savings relative to installation cost.

4.2 Install Solar Photovoltaics

Existing Condition:

Alamosa Plaza Apartments does not have any solar photovoltaics (PV) or other renewable energy generation on site. There are exhaust fan, boiler flue, and plumbing vent penetrations scattered throughout the roof areas.

Efficiency Measure: Alamosa Plaza Apartments has a pitched asphalt shingle roof. Excluding roof penetrations, approximately 50% of the total roof area is available for PV (~3,500 sf).

The total area was multiplied by 18 W/ft2 to come to an estimated system size of 63 kW. Typical parameters were applied in PVWatts to determine a potential energy production of nearly 110,000 kWh per year.

Reason Not Recommended:

A Solar PV system sized to offset expected annual electrical energy usage would be a cost-effective strategy to reduce source energy consumption at this property if the site had master-metered electric service.

However, the significant upfront cost to install a PV system on a building with individual electric meters means the estimated payback is not sufficient to meet project financing requirements. In addition, there appears to be significant shading from trees on the southern and western sides of the buildings which reduces the roof area available for ideal installation of photovoltaics.

5 RECOMMENDED HEALTH & SAFETY MEASURES

5.1 Replace Non-Functional or Low Flow Bathroom

Exhaust Fans

Bathroom exhaust in the units are provided by individually ducted exhaust fans that appear to be original to the building. As part of the audit, all the exhaust intakes at the units were tested for exhaust air flow. All of the exhaust fan terminals were drawing less than 50 cfm, the code minimum bathroom exhaust airflow for intermittent operation. Poor exhaust in wet rooms can create an environment for mold and other air quality health and safety issues.

It is recommended that all exhaust ducting be cleaned, and all exhaust fans should be replaced with ENERGY STAR labeled fans. Fan flow rates should be measured to verify adequate flow.

Please reference Appendix D for a listing of the measured exhaust rates in each unit bathroom.

The new equipment should include the following:

• ENERGY STAR® rated exhaust fans

• Contractor should perform calculations to ensure fan specifications comply with minimum ventilation rates defined in ASHRAE 62.2.

• To ensure adequate flow, in general fans should be rated at 80 CFM if operating intermittently (switched).

30-50 CFM rating may be adequate if fans are operating continuously (hardwired).

• Properly seal the fan to drywall with caulk or other similar material to inhibit air leakage to the exterior of the thermal envelope of the building.

• Always reuse existing duct work. If instances are found where existing duct infrastructure is not code compliant, bring to the attention of the owner.

• All new ductwork routing shall be approved by the Owner for locations and enclosure finishes.

Replacing the exhaust fans with ENERGY STAR qualified fans can save $2-5/fan each year. While this measure would only have an SIR of 0.1, it would produce some energy savings.

5.2 Install Hardwired Combination Smoke/Carbon

Monoxide Alarms

Existing Condition:

Most of the inspected units at the Alamosa Plaza Apartments had a battery-operated smoke alarm and carbon monoxide alarm. Some units had the detectors removed or disabled.

Health & Safety Measure:

Install a hardwired combination smoke and carbon monoxide detector in each unit. The contractor should verify the operation of existing equipment and replace existing smoke detectors that are missing, inoperable or beyond recommended useful life.

I

APPENDIX A – SPECIFICATIONS (PROVIDED

SEPARATELY)

II

APPENDIX B – ONE-LINE DIAGRAM

III

APPENDIX C – ENERGY PLUS DOCUMENTATION

(PROVIDED SEPARATELY)

IV

APPENDIX D – AUDITOR NOTES

Major Equipment Combustion Gas Analysis Results:

Equipment Tag

Fuel %O2 ppm

CO

ppm

CO(O2)

%Efficiency %CO2 %EA TStk TAir Temp Units

B-1 Nat Gas 8.1 30 48 83 7.2 56.5 303 69.9 °F

DHW-1 Nat Gas 7.9 17 27 82.6 7.3 54.5 322 72.6 °F

In-Unit Lighting Audit Results:

Room Num Beds

Location (room)

Fixture Code

Fixture Count

Fixture Control Bulb # Bulb Type Wattage Mounting Type

112 1 Exterior Entry EXT-L 1 Switch 1 LED 8.5 Jelly Jar

112 1 Bedroom 1 SM2-L 1 Switch 2 LED 8.5 Surface Mount

112 1 Closet SM1-L 1 Switch 1 LED 8.5 Surface Mount

112 1 Bathroom 1 EF-L 1 Switch 1 LED 8.5 Exhaust Fan

112 1 Bathroom 1 VAN4-L 1 Switch 4 LED 8.5 Vanity

112 1 Living Room SM2-L 1 Switch 2 LED 8.5 Surface Mount

112 1 Kitchen RH-L 1 Switch 1 LED 8.5 Range Hood

112 1 Kitchen SMR2-L 1 Switch 2 LED 8.5 Surface Mount Round

112 1 Hallway SMR1-L 1 Switch 1 LED 12 Surface Mount Round

102 1 Exterior Entry EXT-I 1 Switch 1 Incandescent 75 Jelly Jar

102 1 Bedroom 1 SM2-L 1 Switch 2 LED 8.5 Surface Mount

102 1 Bedroom 1 SM1-L 1 Switch 1 LED 8.5 Surface Mount

102 1 Bathroom EF-L 1 Switch 1 LED 8.5 Exhaust Fan

102 1 Bathroom VAN4-L 1 Switch 4 LED 8.5 Vanity

102 1 Living Room SM2-L 1 Switch 2 LED 8.5 Surface Mount

102 1 Kitchen RH-I 1 Switch 1 Incandescent 60 Range Hood

102 1 Kitchen SMR2-L 1 Switch 2 LED 8.5 Surface Mount Round

102 1 Hallway SMR1-L 1 Switch 1 LED 8.5 Surface Mount Round

10 1 Exterior Entry EXT-F 1 Switch 1 CFL 13 Jelly Jar

10 1 Bedroom 1 SM2-I 1 Switch 2 Incandescent 60 Surface Mount

10 1 Bedroom 1 SM1-L 1 Switch 1 LED 8.5 Surface Mount

10 1 Bathroom EF-L 1 Switch 1 LED 12 Exhaust Fan

10 1 Bathroom VAN4-F 1 Switch 4 CFL 13 Vanity

10 1 Living Room SM2-L 1 Switch 2 LED 8.5 Surface Mount

V

10 1 Kitchen RH-L 1 Switch 1 LED 8.5 Range Hood

10 1 Kitchen SMR2-L 1 Switch 2 LED 8.5 Surface Mount Round

10 1 Hallway SMR1-L 1 Switch 1 LED 12 Surface Mount Round

5 3 Exterior Entry EXT-L 1 Switch 1 LED 8.5 Jelly Jar

5 3 Bedroom 1 SMR2-L 1 Switch 2 LED 8.5 Surface Mount Round

5 3 Bedroom 2 SMR2-L 1 Switch 2 LED 8.5 Surface Mount Round

5 3 Bedroom 3 SM4-L 1 Switch 4 LED 6 Surface Mount

5 3 Bathroom VAN4-L 1 Switch 4 LED 8.5 Vanity

5 3 Living Room SMR1-L 1 Switch 1 LED 8.5 Surface Mount Round

5 3 Kitchen RH-L 1 Switch 1 LED 8.5 Range Hood

5 3 Kitchen 4WR-T8 1 Switch 2 Fluorescent T8 32 Surface Mount Wrap

5 3 Hallway SMR1-L 1 Switch 1 LED 8.5 Surface Mount Round

VI

VII

APPENDIX E – SITE AUDIT PHOTOS (PROVIDED

SEPARATELY)

VIII

APPENDIX F – HEALTH AND SAFETY CHECKLIST

EOC CEO Multi-Family Health & Safety Inspection and Release Form

Approval Date: 8/31/2018 CEO Wx Health & Safety Form Approved by: CEO Wx Staff

As part of the energy audit process, a health and safety assessment must be performed to identify hazards throughout the entire property that may affect the residents or weatherization worker(s). This assessment is not all inclusive and is performed to the best ability of the energy auditor. The scope of the inspection is limited to readily accessible areas of the property and is a non-destructive examination.

An assessment and complete energy audit of your property was completed. 100% of the residential units, common areas, and mechanical rooms were visually inspected for potential Health and Safety Concerns during the energy audit.

AUDITOR: Please check the box(s) that potential Health and Safety Concerns have been identified:

� Unsafe Heating System � Unit Sleeping Area within Combustion Appliance Zone (CAZ) � Biological and Unsanitary Conditions – Odors, Bacteria, Viruses, Raw Sewage, Pet Waste, Rotting building materials � Mold, Moisture, Plumbing Leaks, Standing Water � Building Structure and Roofing Compromised � Formaldehyde, VOCs, Flammable Liquids, Other Air Pollutants � Fuel Leaks � Hazardous Materials Disposal generated materials (Lead, Mercury, Refrigerant) � Unsafe Area in Home – (Stairs, Handrails) � Pests (Bed Bugs, Cockroaches, Insects, nests, etc.)

� Other: ___________________________

The auditor will provide EOCE with a separate list of each identified potential Health and Safety Concerns with the location/unit #. This list will be provided to the property owner and remedied if possible.

PROPERTY NAME: _______________________________________________________________________________

Auditor (Printed Name and Signature) Date

Auditing Firm

As the Building Owner/Property Representative, I agree that weatherization work does not create additional health and safety problems. I agree to hold (CEO Weatherization Agency, and EOCE) harmless for any future health and safety problems that may arise after weatherization work has been completed.

Property Representative (Printed Name and Signature) Date