36C25623R0096 Design Analysis.pdf

Building 147 – Replace Chiller #3 Alexandria VA Medical Center

Pineville, LA

Bid Documents

Design Analysis

November 09, 2022 Project Number: 502‐21‐110

Bid Documents Submittal

9 September 2022

Building 147 – Replace Chiller #3 at the

Alexandria VAMC Pineville, LA

TABLE OF CONTENTS

I Executive Summary II Environnemental (N/A)

III Civil (N/A) IV Structural V Architectural

VI Fire Protection (N/A) VII Plumbing (N/A)

VIII Mechanical IX Electrical

APPENDICES

A Functional Program B Project Comments & Responses C Meeting Minutes D Cost Estimate E Specifications (Issued separately) F Asbestos & Lead-Based Paint Survey (N/A) G

H

Mechanical TAB A.1 – Weather Data TAB B – Site Survey TAB C – Major Equipment Selections Structural Calculations

Building 147 – Replace Chiller #3, Project No. 502-21-110 Alexandria VAMC, Alexandria, LA.

I. Executive Summary

A/E Chiller #3 Replacement, Project No. 502-21-110

Page I - 2

D. Project Schedule

II. Environmental

(Not Applicable)

III. Civil

IV. Structural

Chiller 3 Replacement Alexandria VA Medical Center

Page IV-1

IV. Structural

A. Goals and Needs:

1. Structural work on this project includes the design of a new wider door opening in the exterior existing masonry wall in order to better facilitate installation of new chiller equipment. The new design will comply with all state and VA building code requirements.

B. Existing Conditions

1. The existing structure is comprised of precast double tee roof panels supported by 8in masonry walls founded on conventionally reinforced concrete wall foundations. Exact wall reinforcing is not known and will require verification by the contractor during construction.

C. Scope of Demolition:

1. Partial demolition of existing wall to widen the existing opening.

D. Scope of New Work:

1. Install new HSS steel lintel.

2. Install new reinforcing steel in wall.

E. Potential Owner Furnished and Installed Items:

None Anticipated

F. Items Needed From VA

1. None anticipated drawings

G. Codes and Standards:

As Listed in Attachment 1 Design Criteria

H. Applicable Specifications

1. 05 12 00 Structural Steel

2. 01 45 35 Special Inspections

I. Attachments

1.Attachment 1: Design Criteria 2.Attachment 2: Structural Calculations

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Attachment No. 1 Design Criteria

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1. Codes & Standards:

a. International Building Code (IBC) 2018 Edition as modified by:

i. Seismic Design Requirements, H-18-8, Department of Veterans

Affairs.

b. ANSI/ASCE 7-16, Minimum Design Loads for Buildings and Other

Structures

c. ACI 318-14 Building Code Requirements for Structural Concrete

d. AISC 360-16, Specification for Steel Buildings

2. Design Loads

a. Dead Loads

i. Existing Roof and Existing Floor: Self weight of building materials

b. Collateral Loads

i. Existing Roof and Existing Floor: 10 psf

c. Live Loads

i. Roof: 20 psf unreducible

ii. Walls: 5 psf minimum

d. Snow Loads: 5 psf

e. Wind loads

i. Ultimate Wind Speed: V=120 mph

ii. Risk Category: IV

iii. Wind Importance Factor: IW=1.0

iv. Wind Exposure: B v.Internal Pressure Coefficient:

a) + 0.18 “Enclosed”

f. Seismic Loads

i. Risk Category: IV

ii. Seismic Importance Factor: IE=1.5

iii. Mapped Spectral Response Accelerations:

a) SS=0.111

b) S1=0.063

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iv. Site Class: D v.Spectral Response Coefficients:

a) SDS=0.118

b) SD1=0.101

vi. Seismic Design Category: C

vii. Basic Seismic-Force-Resisting System

a) Ordinary Reinforced Masonry Shearwall (Assumed)

viii. Response Modification Factor(s): R =2

ix. Analysis Procedure Used: Equivalent Lateral Force Procedure x.Seismic Response Coefficient(s): CS =0.089

3. Serviceability

a. Drift & Deflection Criteria: The criteria used shall be compatible with finish materials for the building that are connected to the building structure.

i. Vertical Deflection

a) New HSS Lintel:

1) Live Load: L/600

2) Dead + Live Load: L/600

V. Architectural

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V. Architectural

A. Goals and Needs:

1. The primary goal is to complete replacement of Chiller #3, located in the Central Chiller Plant at the Alexandria VA Health Care System, Pineville, LA. Chiller #3 is currently decommissioned. It is recommended to replace the chilled water pump due to known issues.

2. See mechanical narrative for detailed discussion of primary requirements for this project.

3. Additional scope is to replace deteriorated areas of chilled water piping insulation as well as widen the door opening to accommodate chiller replacement and reinstall existing door and frame with new louver sidelite.

B. Existing Conditions

The existing 1-story structure consists of a main building with one main space and smaller ancillary rooms. Structure of the building consists of a precast concrete double tees roof slab supported on load bearing CMU/brick veneer exterior walls. Floor is concrete slab-on-grade. Structural calculations of the existing structure are not available.

C. Scope of Demolition

Demolition will be limited to careful removal of the existing door and frame and the widening of the opening to facilitate the removal of the existing Chiller #3. This includes the existing screen door and frame attached to the HM frame. Door, frame and all hardware are to be salvaged and reinstalled after installation of new chiller.

D. Scope of New Work:

New work will consist of making repairs to the existing CMU/brick and floor slab plus the new aluminum louver sidelite to infill at the widened opening. See Mechanical Narrative for more detail

E. Phasing:

The project will not require a phased approach since the Owner will move all operations elsewhere during the course of demolition and repairs. The sequence of renovation work will be addressed by the A/E in more detail in the Mechanical narrative.

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F. Codes and Standards:

1. VA Design Guides-Technical Information Library

2. VA Directive 1061

3. International Building Code, Latest Edition with Louisiana

Amendments

4. International Fire Code/ Life Safety Code, Latest Edition with

Louisiana Amendments

5. NFPA 101 – Latest Edition

6. VA Accessibility Standards

7. NFPA 99

8. NFPA 13 – Latest Edition

VI. Fire Protection

VII. Plumbing

VIII. Mechanical

Alexandria VAMC, Pineville, LA

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VIII. Mechanical

A. Design Requirements:

1. The scope of this project is to provide a replacement for Chiller #3 located at the central chilled water plant. The replacement will include removal and introduction of major equipment, pumping modifications to incorporate new chiller, and controls integration.

2. The design will require connection to existing systems as follows:

a. Existing chilled water loops and equipment will be used and interconnected with the new chiller.

b. All upgrades will include DDC controls integrated to the existing Siemens BAS system.

3. Design criteria. In addition to “Applicable Codes and Standards” listed below, the following VA required design criteria is to be used for design development:

a. Department of Veterans Affairs HVAC Design Manual, 2022.

b. VA Physical Security and Resiliency Design Manual (PSRDM), 2020.

4. Design documents and other deliverables. As required by the contract the following products will be completed and delivered:

a. This design analysis.

b. Construction drawings.

c. Construction specifications.

d. Construction cost estimate.

B. Existing Conditions:

1. An initial survey was performed 1/27/2022 to review existing conditions. See TAB B – Site Survey for additional information.

2. Chiller 3 utilizes two pumps for flow. P-6 serves as the chilled water pump and P-7 serves as the condenser water pump.

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3. P-6 was found to have a lot of corrosion and had reportedly not been operated in roughly 5 years. (B&G 6x8x12; 1560 GPM; 152 FT; HP not listed).

4. P-7 was found to be in reasonable shape but in need of touchup painting and grouting. (B&G 8x10x17.5; 1950 GPM; 83 FT; 60 HP)

5. Much of the original chilled water piping had damaged insulation and resulting condensation was apparent. It is recommended to replace select areas while insulation trade contractors are onsite.

C. Owner Furnished or Installed Items:

1. Owner furnished items: None.

2. Owner installed items: None.

3. Existing items to be reused: Existing DDC control system will be used to integrate the new chiller.

D. Applicable Codes and Standards: (The primary resource used in this design will be VA publications. Where additional information is required to complete the design the below codes and standards will be used.)

1. ASHRAE Standard 90.1 – 2013 Energy Standard for Buildings Except Low-Rise Residential Buildings.

2. ASHRAE Standard 170-2017– Ventilation of Health Care Facilities.

3. ASME B31.1 – 2017 Building Pressure Piping.

4. ASME B31.9 – 2017 Building Services Piping.

5. International Mechanical Code (IMC), 2018 with Addendum.

6. NFPA 70 – National Electric Code.

7. NFPA 90A – 2018 Installation of Air Conditioning and Ventilating Systems.

8. NFPA 90B – 2018 Installation of Warm Air Heating and Air Conditioning Systems.

9. NFPA 110 – Standard for Emergency and Standby Power Systems.

10. SMACNA - HVAC Air Duct Leakage Test Manual, 2012

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11. SMACNA - HVAC Duct Construction Standards - Metal and Flexible, E. Technical Analysis:

1. Phasing requirements: This project has minimal phasing requirements.

2. Critical path issues: None currently.

3. Climatic Conditions: From the VA HVAC Design Manual 2017 with 2019 Revision the climatic design conditions are as follow:

a. Winter: 27.4 F db

b. Winter extreme: 21.5 F db

c. Summer: 97.2/77.1 db/wb

d. Refer to TAB A.1.

4. VA HVAC Criteria per space.

a. This project has no space requirements and is primarily equipment replacement.

5. Chilled Water Plant.

a. The chilled water plant has 4 water cooled chillers served by multiple celled cooling towers located in the adjacent equipment yard. Chillers 1, 2, and 4 are functioning to provide chilled water to the campus. Chiller 3 is offline and non-functional. The recommendation is to replace this chiller in kind.

b. Chiller 3: This 650-ton York machine is the oldest chiller in the plant. It has not functioned properly in several years.

c. Chiller capacity is low for the campus in the summer months.

Likely this project will not be completed before summer so the facility will require temporary chillers to supplement the existing equipment to meet summer load. As such it is recommended to replace Chiller 3.

1. New Chiller: 650 Tons; 1560 GPM; EWT 52 F; LWT 42 F.

a. The 65% design included a layout basis of Daikin WME106CSCSNA. This unit fits through the door, is magnetic bearing and can turn down to 10% capacity. The

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VA rejected this chiller selection due to the chiller having magnetic bearing compressor.

b. The new layout basis is a Carrier 19DV. This model is larger than the existing openings and requires widening of the existing opening. Additionally, it requires the unit to be shipped dry (charged with nitrogen) and assembled in the field due to existing height constraints.

d. One challenge is introducing the equipment into the space.

Previous equipment replacements have required equipment access doors to be removed, widened, and replaced. This has successfully been done by extending the existing lintel and adding a new louver in place of the removed wall. The VA is pleased with this approach and the A/E will proceed with the same strategy if necessary. However, the original layout basis chiller fit through the door. The new layout basis does not fit through the door and widening will be part of the base project.

e. The chiller will be delivered dry and unassembled. The manufacturer or manufacturer representative will be required to assemble and charge the chiller.

f. The intent of the project is to replace only the chiller, however the chilled water pump that is existing (P-6) is recommended to be replaced. This pump has much wear and corrosion apparent and has not been operated in 5 years.

1. New Chilled Water Pump (P-6): 1560 GPM; 150 Ft.HD (head matches existing); 100 HP.

F. Information for Discussion / RFI:

1. None.

G. HVAC Team Items to Complete:

1. None.

H. Equipment Catalog Sheets:

1. TAB C – Major Equipment Sections

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I. Appendixes:

1. TAB A.1 – Weather and Climate Data

2. TAB B – On-Site Survey

3. TAB C – Major Equipment Sections

IX. Electrical

Alexandria VAMC, Alexandria, LA

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IX. Electrical

1. Applicable Codes, Standards & Guidelines

The engineering calculations will be based on the latest recommendations of ASHRAE, NEC and good engineering practices consistent with industry standards. Mechanical equipment electrical requirements will be evaluated based on the current standards.

Codes applicable to the design are as follows.

International Energy Code.

NFPA 70 - National Electrical Code.

NFPA 99 – Health Care Facilities NFPA 101 – Life Safety Code VA Electrical Design Manual for Hospital Projects

1.1 Electrical Service

Demolition:

Existing electrical power connected to the existing chiller #3 and chilled water pump #6 shall be demolished back to source. All exiting conductors and accessories shall be demolished.

Conduits concealed in concrete walls or slabs shall be abandoned. Wiring in abandoned conduits shall be demolished back to source. Existing circuit breakers and disconnect switches shall be demolished back to source. Existing conductors shall be pulled back to the branch circuit protective device and such device shall be identified as a spare. Existing conduit shall be reused if adequate for the new circuit breaker to be installed.

Existing One-line diagram showing 200A breaker for CHWP-6

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Existing MCC disconnect and starter for CWHP-6

New Work:

A new 480V 3-phase 800A NEMA-3R rated disconnect switch shall be provided for new chiller #3. Disconnects shall be circuited to spare breakers or a new 1200A adjustable circuit breaker shall be provided in existing main distribution panelboard spaces that became available during demolition. Circuit breaker shall be adjusted to 800A per the manufacturer’s recommendation. The electrical contractor shall provide all new conductors, conduits and appurtenances required for the complete installation of new mechanical equipment. Should a larger circuit breaker be needed, new feeders and conduits shall be provided to serve the new mechanical equipment.

A new 480V 3-phase 200A VFD shall be provided for the new chilled water pump #6. VFD shall be circuited to spare breakers, or a new 200A circuit breaker shall be provided in existing MCC spaces that became available during demolition. The electrical contractor shall provide all new conductors, conduits and appurtenances required for the complete installation of new mechanical equipment. Should a larger circuit breaker be needed, new feeders and conduits shall be provided to serve the new mechanical equipment.

All motors shall be provided with motor controllers and disconnect switches and major equipment will be provided with non-fused safety switches, based on equipment nameplate

Page IX - 3 data. All motor controllers/starters shall be at minimum NEMA Size 1, unless required otherwise due to environmental conditions. All disconnect switches shall be heavy-duty NEMA Type 1.

Electrical Grounding System

Existing building grounding shall remain. No modifications shall be made to the existing building grounding.

1.2 Materials

The wiring conductors shall be required to meet the load criteria as well as the voltage drop criteria. In accordance with the codes (ASHRAE 90.1, and NEC) impose a maximum 5% voltage drop from the service to any load.

All branch circuit wiring will be with 600 volt rated copper conductors, type THWN or THHN, minimum #12 AWG in minimum 3/4-inch conduits. All interior conduits will be Electrical Metallic Tubing (EMT) unless required otherwise by the code. All exterior exposed conduits will be Galvanized Rigid Steel (GRS) and all exterior underground conduits will be PVC Schedule 40, unless required otherwise by code.

Appendix A

Functional Program

Please note that the requirements specified in the attached document are from the original scope of work provided to TMM. Subsequently, these requirements have been adjusted to reflect budgetary limitations.

Appendix B

Project Comments & Responses

Appendix C

Meeting Minutes

Appendix D

Cost Estimate

Appendix E

Specifications

(Under Separate Cover)

Appendix F

Asbestos & Lead-based Paint Survey

Appendix G Mechanical

TAB A.1 – Weather Data

TAB B – Site Survey

The project is to remove chiller number three which is a York 650 ton chiller.

Pumping configuration Condenser water is provided directly to the chiller through pump number 7 a HSC pump that is in working order appears to be in good shape.

Chilled water is through a common loop that is on the roof. The VA said each pump stages on with its associated chiller. So each chiller has its own pump. Chiller number three is served by a HSC pump number 6. It is stated that this pump has not been operated in 5 years. It is recommended to replace this pump size it for coordinated flow with the new chiller number three.

Condenser water pump number 7

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Chiller#3

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Chiller #1

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Chiller 2

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Chiller 4

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Electrical

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Water treatment Thursday, January 27, 2022 10:57 AM

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Previous door widening

EC Architecture Thursday, January 27, 2022 11:09 AM

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Existing to be widened

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Remove remove existing doors and replace in kind or replace with new roll up door. Either are acceptable to the VA. Previous projects where chillers were introduced the height of the opening remain the same however they had to widen the opening instead of feeling with brick, the contractor put in louver. This is acceptable to the VA as well.

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Remove existing chiller number three.

Disconnect chilled water supply downstream of control valve mv-ch-3. Replace control valve and all associated controls. Onikon flow meter to be repaired and made operational according to new sequence. Flow meter to be reused.

Mechanical Scope Thursday, January 27, 2022 11:18 AM

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Remove chill water return from isolation valve the chiller 3. She'll want to return maybe isolated from or at rather the chill water loop on the roof. Replace isolation valve. Replace thermometers and gauges.

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Remove pump number 6 and its entirety. Exercise valves to ensure blocking capability before beginning work. Remove existing isolation base and prepare for new installation. Isolation valves to remain.

Replace gauges and repair pipe. Remove and replace variable speed drive associated with pump.

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Remove abandoned chillwater treatment connected to inlet and outlet of pump number 6.

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Condensed water pump number 7 to remain

Green green line in line wave water treatment to remain reconfigure piping to connect to new chiller from flange at water treatment outlet.

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Remove and replace insulation on chilled water piping in area of work and above chiller number two and as noted on drawings.

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Chiller shall operate under its own control Siemens system shall have capability to overwrite set points start stop unit open close isolation valves and read all data from chiller control panel.

Provide new control panel for chiller remove existing.

Reuse existing onicon flow meter on chill water supply. Repair and re-sequence.

Reuse existing flow meter on condenser water piping no work required.

Controls Thursday, January 27, 2022 11:35 AM

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TAB C – Major Equipment Selections

You asked for the impossible. So we built it.

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