Attachment 02 Omaha EHRM 100 Narrative Mechanical.pdf

100% SD Submission

EHRM Infrastructure Upgrades

Omaha, NE

Project Number 695-21-700

Table of Contents

A. INTRODUCTION

B. EXECUTIVE SUMMARY

C. ARCHITECTURAL REQUIREMENTS

D. INTERIOR DESIGN REQUIREMENTS

E. SPACE PLANNING REQUIREMENTS

F. EQUIPMENT REQUIREMENTS

G. HEATING, VENTILATING & AIR CONDITIONING REQUIREMENTS

H. PLUMBING/ SANITARY REQUIREMENTS

I. ELECTRICAL AND TECHNOLOGY REQUIREMENTS

J. FIRE PROTECTION REQUIREMENTS

K. SPECIFICATIONS

L. CRITICAL PATH METHOD (CPM) REQUIREMENTS

M. ESTIMATING

N. APPENDIXES

APPENDIX 1 Drawings #1

APPENDIX 2 x

APPENDIX 3 x

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A. Introduction:

B. Executive Summary:

C. Architectural Requirements:

D. Interior Design Requirements:

E. Space Planning Requirements:

F. Equipment:

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G. Heating, Ventilating, & Air Conditioning Requirements:

1. Introduction and General Requirements:

This narrative describes the intended mechanical building systems for the new electronic health record modernization project. In addition to describing the systems, the fundamental assumptions used for the design are outlined. Mechanical systems to follow

VA HVAC Design Manual, the Infrastructure Standard for Telecommunications Spaces, and current building codes.

Reference the attachments for room specific details. Reference the “OIT TR ROOM DESIGN

INPUT COORDINATION SCHEDULE” for coordination review and acceptance of systems to be specified.

2. General Building Design Criteria and Assumptions:

a. Codes

• State of Nebraska Building Codes

• Building Code - 2015 International Building Code

• Existing Building Code - 2015 International Existing Building Code

• National Electrical Code - 2017

• Mechanical Code - 2015 International Mechanical Code

• Plumbing Code - 2015 International Plumbing Code

• Fire Protection Code - 2015 International Fire Code

• NFPA 101 (2018), NFPA 99 (2018), NFPA 13 (2016), NFPA 75 (2020)

b. Design Manuals and Design Guides

• VA HVAC Design Manual (November 2021)

• VA Plumbing Design Manual (Revised May 1, 2018)

• VA Fire Protection Design Manual (June 2021)

• VA Electrical Design Manual (December 1, 2019)

• VA OIT Infrastructure Standard for Telecommunications Spaces (July 2021)

c. Summer Space Environmental Requirements

• TETR1: Telecommunications Room:

i. 75°F to 80°F max.

ii. AC supply temperature setpoints between 64°F and 81°F.

iii. AC rack inlet temperature setpoints between 72°F and 80.6°F.

iv. Humidity monitoring only: 60/30 % RH high/low limit.

v. Air recirculated/returned.

vi. Neutral pressure.

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vii. Constant volume.

d. Cooling Design Outdoor Air Conditions:

• 94.5°Fdb/76.4°Fwb. (based on VA HVAC Design Guide 0.4% DB/WB for Omaha, Nebraska – Omaha Eppley Airfield).

e. Winter Space Environmental Requirements

• TETR1: Telecommunications Room:

a) 64°F to 80°F max..

b) AC supply temperature setpoints between 64°F and 81°F.

c) AC rack inlet temperature setpoints between 72°F and 80.6°F.

d) Humidity monitoring only: 60/30 % RH high/low limit.

e) Air recirculated/returned.

f) Positive pressure.

g) Constant volume.

f. Heating Design Outdoor Air Conditions:

• -4.3°F (based on VA HVAC Design Guide 99.6% DB for Omaha, Nebraska – Omaha

Eppley Airfield)

g. Seismic bracing for MEP systems is not required.

h. Typical Hours of Operation: 24 hours per day. 365 days per year.

i. Systems Requirements

• Cooling shall be provided by independent unitary equipment for providing

24/7/365 cooling. The following equipment types are used. Reference on plan schedules and attachments for further details.

a. Direct expansion (DX) split fan coil and condenser heat pumps, wall mounted.

b. Direct expansion split computer room air conditioning air handler with remote air cooled condensing unit (DX), ceiling mounted.

• The use of these noted systems offers the best efficiency available, lowest cost of installation, as well as best practical application for the facilities. DX systems offer cooling efficiency far above energy code and are the most efficient available. DX systems are noted for use in the VA OIT Design Guide. Use of such systems was discussed with VA personnel and was agreed upon.

• Systems will be right sized to meet IT equipment heat gains per VA standard literature but not to exceed rated power consumed. Or per OIT Manual page

152: 5kw (17,060btuh) / rack when explicit heat loads are not provided.

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• For rooms deemed critical, provide number of required units for operation plus one standby unit (N+1) of equal capacity of largest N units.

• For rooms deemed non-critical, redundant equipment is not required. Such rooms may be served by dx split system cooling systems.

• Heating not required where internal heat load exceeds exterior envelope heat loss. Reheat as needed by electric coil.

• Total airflow based on cooling load and equipment capacity. Ventilation load based on ASHRASE 62.1. VA standard minimum two total air changes per hour of supply, and no required outside air ventilation. Thus rooms will be maintained at neutral pressure, not positive per design standard.

• Humidification systems are not provided. Room humidity will be monitored only.

This is due to conflict in VA design standards. The HVAC manual prescribes the use of plant steam, while the OIT manual prohibits its use. The OIT manual prescribes dry fog systems and prohibits the use of plant steam, while the VHA

Directive 1061 (Prevention of Legionella Disease) prohibits such systems. The VA has not provided further guidance beyond the omission of humidification systems for EHRM projects.

• Panning below any existing pipes or potential sources for water leaks to protect electronic equipment, or directly above racks.

• Air distribution for proper air circulation around IT equipment. Duct and piping will be minimized to reduce water related issues. Unitary equipment will have onboard supply and return grilles to circulate air as needed.

• Existing systems will be demolished or modified as needed.

• For Building 1 chilled water is not available for use year round.

• Generator building has generator air flow louvers with interlocked dampers with generator operation, generator flue stack, general area ventilation explosion proof exhaust fans and interlocked dampers, explosion proof electric heaters, generator fuel systems and storage tanks, and controls for all systems.

j. Temperature Controls

• Temperature control equipment to be connected to the central hvac automation system with bacnet devices for central monitoring and alarm system operation.

• Each room will have a temperature sensor, space humidity sensor, floor moisture sensor by IT racks, IT rack temperature and power monitoring, room power monitoring, auxiliary drain pan moisture sensor (not float switch) and supply air temperature sensors on all cw and dx units, and /or vav terminals; and connected to the central ecc system for trending and alarm purposes.

• The central ecc system shall monitor space conditions and unit status, and shall alarm the boiler plant operator or hvac shop whenever temperature or humidity are out of tolerance, when water is in the hvac secondary drain pan if one is

Omaha, NE provided, and when any supply air temperature does not match what is required by room conditions. Additional alarms for power monitoring are provided.

• Controls sequences are provided on plan sheets.

• Schneider Electric will be the specified system integrator.

k. Internal heat loading

• VA standards assume that each network rack has 5 kw of electrical capacity. The design will follow the below Omaha VA provided heat load schedule for cooling per installed rack.

• To follow the requirement for cooling load not to exceed 1 watt of cooling per 1 watt of power consumed, heat loads for each room need to be specifically determined. This will help ensure proper equipment sizing for reduced performance issues and cost savings. If such data is not provided the 5 kw per rack will be provided.

• 35% VA COMMENTS: Cooling per TR/number of racks will be as follows

• We need 5kW per rack, however in aggregate we don't need 5kW for each of four racks. Update standard and TR design checklist with new language, applicable for both new construction and renovations.

• 1 rack TR = 5 kW (e.g. single 5kW cooling unit).

• 2 rack TR = 7 kW (e.g. 3.5kW x2 cooling units).

• 3 rack TR = 8.5 kW (e.g. 3.5kW + 2.5kW x2 cooling units).

• 4 rack TR =10 kW (e.g. 2.5kW x4 or 5kW x2 cooling units).

• 5 rack TR =11.5 kW

• 6 rack TR =13 kW

• 7 rack TR =14.5 kW

• 8 rack TR =16 kW

• Other designs meeting these maximum expected aggregated load levels are acceptable.

• Multiple smaller units will assist in avoiding equipment freeze-up in some types of equipment.

• Envelope Assumptions

• U-value wall: 0.104 Btu/h*sf*F

• U-value roof: 0.039 Btu/h*sf*F

• U-value glazing: 0.6 Btu/h*sf*F, 0.88 SHGF

• Light density average: 0.8 watts/sf

Attachments:

None

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Plumbing/ Sanitary Requirements

2. Plumbing Systems

a. Existing fixtures and piping will be demolished and repurposed as noted.

b. Condensate drainage pipe will be routed to vented hub drains.

c. Existing pipe risers which must remain such as sanitary and vent will be offset and repurposed as necessary. New vent piping will be routed from new drains to the closest existing vent pipe mains of adequate size.

d. Pipe connections for waste, and vent will be made at nearest mains.

e. Domestic cold water provided for trap primers, includes backflow prevention. Pipe connections to be made at nearest branch main.

f. Plumbing fixtures within rooms will be demolished, and piping capped at nearest mains or repurposed for new cooling system.

H. Electrical and Technology Requirements:

1. Lighting System Requirements

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I. Fire Protection Requirements:

1. Existing Fire Sprinkler System Description:

a. Buildings where existing fire protection systems are installed, those systems will be modified to serve the spaces of this project accordingly.

2. New Fire Sprinkler System Description:

a. TE/TR rooms designed to ANSI/TIA-943-B Rating 1.

b. TE rooms in buildings where existing fire protection systems are installed, those systems will be modified to serve the spaces of this project accordingly.

c. New sprinkler heads will be provided for any piping removed and/or relocated and as required for proper coverage. The existing disconnected sprinkler heads will not be reused.

d. New piping mains will be routed from the existing mains to the area of work to provide the required coverage.

e. Hazard classifications include:

i. Light Hazard for offices, conference rooms, and corridors.

ii. Ordinary Hazard Group 1 for electric closet rooms.

iii. Ordinary Hazard Group 2 for storage rooms.

f. Generator building will be provided with a dry pipe sprinkler system with compressed air.

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Generator Building

MECHANICAL NARRATIVE

1. Design Codes

a. International Building Code 2022

a. Mechanical Code - 2022 International Mechanical Code

a. Plumbing Code - 2022 International Plumbing Code

a. Fire Protection Codes 2022- NFPA 13, 30, 37, 58, 110

a. VA Design Guides

1. Fuel tank

a. Tank size, preliminary, for 96 hours of operation 6,000 gallons (3,400 gal. min.)

above grade tank. 64” diameter. 24 ft long.

a. Fuel pump system and controls.

a. Fuel leak detection system.

a. Steel piping schd-40.

1. Systems Provided

a. Generator Room i.Generator intake and exhaust louvers with interlocked motorized dampers, sized to meet airflow demand.

i.Generator combustion flue stack through roof.

i.Electric explosion proof unit heater.

i.General exhaust fan with motorized louvers.

a. Electrical Room i.Electric explosion proof unit heater.

i.General exhaust fan with motorized louvers.

a. EM Electrical Room i.Electric explosion proof unit heater.

i.General exhaust fan with motorized louvers.

a. Control Systems i.Each mechanical system will be connected to existing campus DDC building automation system.

a. Fire suppression system i.Automatic dry pipe sprinkler system with compressed air.

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