ASHRAE Journal - March 2010 - 52

Reference Probe Dry Bulb °F (°C) CRAC Unit Panel Dry Bulb °F (°C) °F (°C) RH 27.5 28.5 38.5 31.5 32.8 31.4 27.5 38.5 31.7 Dew Point 47.0 (8.3) 46.1 (7.8) 46.1 (7.9) 47.2 (8.4) 46.1 (7.8) 46.1 (7.8) 46.1 (7.8) 47.2 (8.4) 46.4 (8.0) RH 32.0 51.0 47.0 43.0 45.0 43.0 32.0 51.0 43.5 Dew Point °F (°C) Mode Cooling Cooling & Dehumidification Cooling Cooling & Humidification Cooling Cooling & Humidification AC 005 AC 006 AC 007 AC 008 AC 010 AC 011 Minimum Maximum Average 84.0 (28.9) 81.8 (27.7) 72.8 (22.7) 80.0 (26.7) 77.5 (25.3) 78.9 (26.0) 72.8 (22.7) 84.0 (28.9) 79.2 (26.2) 76.0 (24.4) 55.0 (12.8) 70.0 (21.1) 74.0 (23.3) 68.0 (20.0) 70.0 (21.1) 55.0 (12.8) 76.0 (24.4) 68.8 (20.5) 44.1 (6.7) 37.2 (2.9) 48.9 (9.4) 50.2 (10.1) 45.9 (7.7) 46.6 (8.1) 37.2 (2.9) 50.2 (10.1) 45.5 (7.5) Table 2: Field survey of CRAC units with reference temperature and humidity sensor. steam, which not only use energy to evaporate the water but add heat to the data center that must be removed by the cooling units. The infrared technology is the most prevalent because it is provided with CRAC or CRAH units as a standard factory option. By contrast, ultrasonic humidifiers are adiabatic (they do not add heat to the data center). Ultrasonic humidifiers require treated water (typically using either deionization or reverse osmosis filtration systems) to remove the dissolved solids from the water. These minerals in the water, if uncontrolled, can turn into conductive dust that can be spread into the data center. Arguably, the most efficient of the humidification technologies is direct evaporative cooling. Unfortunately, this technology is rarely used in current practice. Where humidification is provided by infrared or steam humidifiers in data centers with air-side economizers, the economizer should include a nonstandard low outdoor air dew-point switch When it has to be stainless, it has to be A-J! The experts in stainless steel clean air systems for operating rooms plus: • Custom fabrication • Rush deliveries A-J Manufacturing offers a complete line of custom and standard stainless steel air distribution products, all designed and manufactured to offer durable, dependable and low maintenance performance necessary for hospitals, labs, wash down areas and more. What’s more, with our state-of-the-art manufacturing capabilities, we can also offer you the industry’s shortest lead times for custom orders. So for continuous linear, security grilles, modular diffusers and much more, contact A-J Manufacturing today! A-J Manufacturing 800-247-5746 • www.ajmfg.com www.info.hotims.com/30302-4 www.info.hotims.com/30302-10 ASHRAE Journal March 2010

ASHRAE Journal - March 2010

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

Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Standard 62.1-2007: Dynamic Reset for Multiple-Zone Systems
35 Years of Standard 90.1
Humidity Controls for Data Centers: Are They Necessary?
ASHRAE’s Best: 2010 Technology Awards
Technology Award Case Studies: Green Warehouse
Building Sciences
Products
Emerging Technologies
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - March 2010 - Cover1
ASHRAE Journal - March 2010 - Cover2
ASHRAE Journal - March 2010 - 1
ASHRAE Journal - March 2010 - 2
ASHRAE Journal - March 2010 - Contents
ASHRAE Journal - March 2010 - Commentary
ASHRAE Journal - March 2010 - 5
ASHRAE Journal - March 2010 - Industry News
ASHRAE Journal - March 2010 - 7
ASHRAE Journal - March 2010 - 8
ASHRAE Journal - March 2010 - MIT1
ASHRAE Journal - March 2010 - MIT2
ASHRAE Journal - March 2010 - MIT3
ASHRAE Journal - March 2010 - MIT4
ASHRAE Journal - March 2010 - MIT5
ASHRAE Journal - March 2010 - MIT6
ASHRAE Journal - March 2010 - MIT7
ASHRAE Journal - March 2010 - MIT8
ASHRAE Journal - March 2010 - 9
ASHRAE Journal - March 2010 - 10
ASHRAE Journal - March 2010 - 11
ASHRAE Journal - March 2010 - Letters
ASHRAE Journal - March 2010 - 13
ASHRAE Journal - March 2010 - 14
ASHRAE Journal - March 2010 - 15
ASHRAE Journal - March 2010 - 16
ASHRAE Journal - March 2010 - 17
ASHRAE Journal - March 2010 - 18
ASHRAE Journal - March 2010 - 19
ASHRAE Journal - March 2010 - Meetings and Shows
ASHRAE Journal - March 2010 - 21
ASHRAE Journal - March 2010 - Standard 62.1-2007: Dynamic Reset for Multiple-Zone Systems
ASHRAE Journal - March 2010 - 23
ASHRAE Journal - March 2010 - 24
ASHRAE Journal - March 2010 - 24a
ASHRAE Journal - March 2010 - 24b
ASHRAE Journal - March 2010 - 25
ASHRAE Journal - March 2010 - 26
ASHRAE Journal - March 2010 - 27
ASHRAE Journal - March 2010 - 28
ASHRAE Journal - March 2010 - 29
ASHRAE Journal - March 2010 - 30
ASHRAE Journal - March 2010 - 31
ASHRAE Journal - March 2010 - 32
ASHRAE Journal - March 2010 - 33
ASHRAE Journal - March 2010 - 34
ASHRAE Journal - March 2010 - 35
ASHRAE Journal - March 2010 - 35 Years of Standard 90.1
ASHRAE Journal - March 2010 - 37
ASHRAE Journal - March 2010 - 38
ASHRAE Journal - March 2010 - 39
ASHRAE Journal - March 2010 - 40
ASHRAE Journal - March 2010 - MITE1
ASHRAE Journal - March 2010 - MITE2
ASHRAE Journal - March 2010 - 41
ASHRAE Journal - March 2010 - 42
ASHRAE Journal - March 2010 - 43
ASHRAE Journal - March 2010 - 44
ASHRAE Journal - March 2010 - 45
ASHRAE Journal - March 2010 - 46
ASHRAE Journal - March 2010 - 47
ASHRAE Journal - March 2010 - Humidity Controls for Data Centers: Are They Necessary?
ASHRAE Journal - March 2010 - 49
ASHRAE Journal - March 2010 - 50
ASHRAE Journal - March 2010 - 51
ASHRAE Journal - March 2010 - 52
ASHRAE Journal - March 2010 - 53
ASHRAE Journal - March 2010 - 54
ASHRAE Journal - March 2010 - 55
ASHRAE Journal - March 2010 - ASHRAE’s Best: 2010 Technology Awards
ASHRAE Journal - March 2010 - 57
ASHRAE Journal - March 2010 - 58
ASHRAE Journal - March 2010 - 59
ASHRAE Journal - March 2010 - 60
ASHRAE Journal - March 2010 - 61
ASHRAE Journal - March 2010 - 62
ASHRAE Journal - March 2010 - 63
ASHRAE Journal - March 2010 - Technology Award Case Studies: Green Warehouse
ASHRAE Journal - March 2010 - 65
ASHRAE Journal - March 2010 - 66
ASHRAE Journal - March 2010 - 67
ASHRAE Journal - March 2010 - 68
ASHRAE Journal - March 2010 - 69
ASHRAE Journal - March 2010 - 70
ASHRAE Journal - March 2010 - 71
ASHRAE Journal - March 2010 - Building Sciences
ASHRAE Journal - March 2010 - 73
ASHRAE Journal - March 2010 - 74
ASHRAE Journal - March 2010 - 75
ASHRAE Journal - March 2010 - 76
ASHRAE Journal - March 2010 - 77
ASHRAE Journal - March 2010 - 78
ASHRAE Journal - March 2010 - 79
ASHRAE Journal - March 2010 - Products
ASHRAE Journal - March 2010 - 81
ASHRAE Journal - March 2010 - Emerging Technologies
ASHRAE Journal - March 2010 - 83
ASHRAE Journal - March 2010 - Special Products
ASHRAE Journal - March 2010 - Classified Advertising
ASHRAE Journal - March 2010 - 86
ASHRAE Journal - March 2010 - 87
ASHRAE Journal - March 2010 - Advertisers Index
ASHRAE Journal - March 2010 - Cover3
ASHRAE Journal - March 2010 - Cover4
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