ASHRAE Journal - September 2010 - 48

fan sections consist of multiple, plugplenum fans, each independently back drafted, as well as electrically isolated and monitored through motor overload current transformers. The unit was designed with N+2 fan systems redundancy such that should several supply or return fans fail, the loss of pressure will be isolated across non-operational fans, allowing the remaining fans to increase speed to maintain the required airflow via pressure within the duct systems. The supply and return fans each have redundant drives such that if one variable frequency drive (VFD) fails, the second has a parallel run signal enabling the backup VFD to catch the fans midrotation, maintaining minimal interruption to airflow. All caustic air within the process BSCs is exhausted; all other facility air is returned to the central system. Heat recovery of exhaust air was not viable due to economic and potential biological considerations. Following f iltration, a high-plume, induction exhaust system was used to prevent reentrainment of the air. The system consists of two exhaust fans, both on VFDs, again with one fan operating Figure 2a: Partial seventh floor mechanical plan–cold room. and the other fan in standby, serving a common exhaust plenum. The redundant fans, similar to the air-handling unit, use parallel run signals, independently isolated. Both the air-handling unit and the exhaust systems were designed for excess capacity, affording future expansions of the CTPF. The equipment is designed and presently operating to allow for half of the non-clean laboratory to be converted and certified to FDA validated processing space in the future. As the CTPF is located within the hospital’s institutional occupancy, the electrical requirements were segregated to their own critical branch: redundant to both a utility primary and a secondary, they are also connected to an emergency generator. As such, 100% of the facility’s loads attain emergency power restoration within 10 seconds of failure, per the National Fire Protection Association (NFPA). The facility was designed with a utility corridor surrounding the perimeter of the cleanroom space to allow access to critical air valves, which are installed close to the facility Figure 2b: Cold room section. perimeter for easy access, and to provide access to the process cooling system for the cold room. A walkable ceiling grid was The hydronic reheat system uses high pressure steam from installed throughout the space so that maintenance personnel the building plant that is reduced through dual-stage regulating may access any valves, coils or equipment that cannot be from 165 psig to 15 psig (1239 kPa to 204 kPa) for two paralreached from the utility corridors without interrupting the lel steam-to-hot water exchangers. Two distribution pumps, ISO-classified areas. of variable-primary control, operate in a lead-lag sequence to
48	 ASHRAE	Journal	 ashrae.org	 	 September	 2010



ASHRAE Journal - September 2010

Table of Contents for the Digital Edition of ASHRAE Journal - September 2010

ASHRAE Journal - September 2010
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Doored Display Cases: They Save Energy, Don't Lose Sales
Energy Storage: Providing for a Low-Carbon Future
Specifying Insulation for Air Terminal Units
Stem Cell Lab
Horticultural Lab
Fume Hood Retrofit
Cooling Load Design Tool for UFAD
AHR Expo Mexico 2010 Show Guide
Emerging Technologies
Building Sciences
Solar Applications
Operations & Maintenance
Washington Report
People
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - September 2010 - Intro
ASHRAE Journal - September 2010 - ASHRAE Journal - September 2010
ASHRAE Journal - September 2010 - Cover2
ASHRAE Journal - September 2010 - 1
ASHRAE Journal - September 2010 - 2
ASHRAE Journal - September 2010 - Contents
ASHRAE Journal - September 2010 - Commentary
ASHRAE Journal - September 2010 - 5
ASHRAE Journal - September 2010 - Industry News
ASHRAE Journal - September 2010 - 7
ASHRAE Journal - September 2010 - 8
ASHRAE Journal - September 2010 - 9
ASHRAE Journal - September 2010 - Letters
ASHRAE Journal - September 2010 - 11
ASHRAE Journal - September 2010 - 12
ASHRAE Journal - September 2010 - 13
ASHRAE Journal - September 2010 - 14
ASHRAE Journal - September 2010 - 15
ASHRAE Journal - September 2010 - Meetings and Shows
ASHRAE Journal - September 2010 - 17
ASHRAE Journal - September 2010 - Doored Display Cases: They Save Energy, Don't Lose Sales
ASHRAE Journal - September 2010 - 19
ASHRAE Journal - September 2010 - 20
ASHRAE Journal - September 2010 - 21
ASHRAE Journal - September 2010 - 22
ASHRAE Journal - September 2010 - 23
ASHRAE Journal - September 2010 - 24
ASHRAE Journal - September 2010 - 25
ASHRAE Journal - September 2010 - 26
ASHRAE Journal - September 2010 - 27
ASHRAE Journal - September 2010 - Energy Storage: Providing for a Low-Carbon Future
ASHRAE Journal - September 2010 - 29
ASHRAE Journal - September 2010 - 30
ASHRAE Journal - September 2010 - 31
ASHRAE Journal - September 2010 - 32
ASHRAE Journal - September 2010 - 33
ASHRAE Journal - September 2010 - 34
ASHRAE Journal - September 2010 - 35
ASHRAE Journal - September 2010 - 36
ASHRAE Journal - September 2010 - 37
ASHRAE Journal - September 2010 - Specifying Insulation for Air Terminal Units
ASHRAE Journal - September 2010 - 39
ASHRAE Journal - September 2010 - 40
ASHRAE Journal - September 2010 - 41
ASHRAE Journal - September 2010 - 42
ASHRAE Journal - September 2010 - 43
ASHRAE Journal - September 2010 - Stem Cell Lab
ASHRAE Journal - September 2010 - 45
ASHRAE Journal - September 2010 - 46
ASHRAE Journal - September 2010 - 47
ASHRAE Journal - September 2010 - 48
ASHRAE Journal - September 2010 - 49
ASHRAE Journal - September 2010 - Horticultural Lab
ASHRAE Journal - September 2010 - 51
ASHRAE Journal - September 2010 - 52
ASHRAE Journal - September 2010 - 53
ASHRAE Journal - September 2010 - 54
ASHRAE Journal - September 2010 - 55
ASHRAE Journal - September 2010 - Fume Hood Retrofit
ASHRAE Journal - September 2010 - 57
ASHRAE Journal - September 2010 - 58
ASHRAE Journal - September 2010 - 59
ASHRAE Journal - September 2010 - 60
ASHRAE Journal - September 2010 - 61
ASHRAE Journal - September 2010 - Cooling Load Design Tool for UFAD
ASHRAE Journal - September 2010 - 63
ASHRAE Journal - September 2010 - 64
ASHRAE Journal - September 2010 - 65
ASHRAE Journal - September 2010 - 66
ASHRAE Journal - September 2010 - 67
ASHRAE Journal - September 2010 - 68
ASHRAE Journal - September 2010 - 69
ASHRAE Journal - September 2010 - 70
ASHRAE Journal - September 2010 - 71
ASHRAE Journal - September 2010 - 72
ASHRAE Journal - September 2010 - AHR Expo Mexico 2010 Show Guide
ASHRAE Journal - September 2010 - S2
ASHRAE Journal - September 2010 - S3
ASHRAE Journal - September 2010 - S4
ASHRAE Journal - September 2010 - S5
ASHRAE Journal - September 2010 - S6
ASHRAE Journal - September 2010 - S7
ASHRAE Journal - September 2010 - S8
ASHRAE Journal - September 2010 - S9
ASHRAE Journal - September 2010 - S10
ASHRAE Journal - September 2010 - S11
ASHRAE Journal - September 2010 - S12
ASHRAE Journal - September 2010 - S13
ASHRAE Journal - September 2010 - S14
ASHRAE Journal - September 2010 - S15
ASHRAE Journal - September 2010 - S16
ASHRAE Journal - September 2010 - S17
ASHRAE Journal - September 2010 - S18
ASHRAE Journal - September 2010 - S19
ASHRAE Journal - September 2010 - S20
ASHRAE Journal - September 2010 - S21
ASHRAE Journal - September 2010 - S22
ASHRAE Journal - September 2010 - S23
ASHRAE Journal - September 2010 - S24
ASHRAE Journal - September 2010 - S25
ASHRAE Journal - September 2010 - S26
ASHRAE Journal - September 2010 - S27
ASHRAE Journal - September 2010 - S28
ASHRAE Journal - September 2010 - S29
ASHRAE Journal - September 2010 - S30
ASHRAE Journal - September 2010 - S31
ASHRAE Journal - September 2010 - S32
ASHRAE Journal - September 2010 - Emerging Technologies
ASHRAE Journal - September 2010 - 74
ASHRAE Journal - September 2010 - 75
ASHRAE Journal - September 2010 - 76
ASHRAE Journal - September 2010 - 77
ASHRAE Journal - September 2010 - Building Sciences
ASHRAE Journal - September 2010 - 79
ASHRAE Journal - September 2010 - 80
ASHRAE Journal - September 2010 - 81
ASHRAE Journal - September 2010 - 82
ASHRAE Journal - September 2010 - 83
ASHRAE Journal - September 2010 - 84
ASHRAE Journal - September 2010 - 85
ASHRAE Journal - September 2010 - 86
ASHRAE Journal - September 2010 - 87
ASHRAE Journal - September 2010 - Solar Applications
ASHRAE Journal - September 2010 - 89
ASHRAE Journal - September 2010 - 90
ASHRAE Journal - September 2010 - 91
ASHRAE Journal - September 2010 - Operations & Maintenance
ASHRAE Journal - September 2010 - 93
ASHRAE Journal - September 2010 - Washington Report
ASHRAE Journal - September 2010 - 95
ASHRAE Journal - September 2010 - People
ASHRAE Journal - September 2010 - Products
ASHRAE Journal - September 2010 - 98
ASHRAE Journal - September 2010 - 99
ASHRAE Journal - September 2010 - 100
ASHRAE Journal - September 2010 - 101
ASHRAE Journal - September 2010 - Classified Advertising
ASHRAE Journal - September 2010 - 103
ASHRAE Journal - September 2010 - Advertisers Index
ASHRAE Journal - September 2010 - Cover3
ASHRAE Journal - September 2010 - Cover4
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