HEFP SEP Design Alert 8 - Temp and Humidity Conflict Resolution.pdf
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- Attached to
- Y1AZ--(640A4-21-703) EHRM Training and Administrative Support Space Construction - Livermore, CA
- Solicitation number
- 36C77622R0043
About this file
This document provides guidance on a forthcoming design-build solicitation from the Department of Veterans Affairs for infrastructure upgrades at its Palo Alto Health Care System campus in Livermore, California. The solicitation will request proposals for site preparation and utility installation to support new EHRM command, administrative, and training trailers, including grading, walkways, electrical, water, sewer, and telecommunications infrastructure. The contract will be a single award firm-fixed-price design-build contract set aside for Service-Disabled Veteran-Owned Small Businesses. The project magnitude is between $500,000 to $1 million and the period of performance is approximately 300 calendar days. The solicitation is expected to be released in late February to early March 2022.
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HEFP/10NA5G/18APR2022
A conflict was noted between the Infrastructure Standard for Telecommunication Spaces (ISTS) v3.1 and the HVAC Design Manual concerning design parameters for temperature and relative humidity ranges in Telecommunication Spaces.
This Design Alert provides temporary guidance on temperature and relative humidity design ranges for Telecommunication Spaces. This Design Alert will remain in effect until the Infrastructure Standard for Telecommunications Spaces and the HVAC Design Manual publish updates that reconcile the temperature and relative humidity parameters.
The HVAC Design Manual requires a dry bulb temperature of 64◦ F for heating and 81◦ F for cooling and a relative humidity of 30% RH to 60% RH for Telecommunication Spaces, (pp. 6-106 for Data Centers and pp. 6-109 for TRs). These temperatures are supply temperatures. The ISTS requires rack inlet temperatures in telecommunications rooms between 41°F and 95°F and between 72°F and 80.6°F in computer rooms with a relative humidity range of 8% to 80%. Please use the Computational Fluid Dynamics (CFD) Modeling Guide for CRAC and rack inlet temperature design in Data Centers while meeting the more stringent of the two standards. To summarize, AC supply temperature set points must be between 64°F and 81°F per the HVAC Design Manual while maintaining rack inlet temperatures between 72°F and 80.6°F in computer rooms. Relative humidity in all telecommunications spaces will be maintained at the more stringent HVAC Design Manual requirements of 30% to 60%.
HEFP SEP (SOCAMES 6) Design Alert 8
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