ASHRAE Journal - August 2012 - 10
letters
while employed by a California licensed C-10 electrical contractor who holds a CALCTP contractor certification....” A workshop was held at the California Energy Commission on Feb. 27, 2012, to take input on these proposals. Letters were submitted on both sides of this issue and are posted on the CEC website at: http://tinyurl.com/ct9wkah. This includes the original letters from the State Senator and Assembly Member. The opposition to these proposals included many consulting engineers, commissioning agents, design build contractors and Cal SMACNA. On the mechanical side the opposition letters had a common theme that these proposals would limit many qualified personnel from performing these tests simply because they were not certified by NEBB, AABC or TABB. ASHRAE did not take an official stand on this issue. An email was sent to alert ASHRAE members in California to this issue, with a link to the CEC website where they could get more information on the workshop and proposals. Many ASHRAE members responded and their responses can be found at the link above. Although I support the underlying issues of improving enforcement by the building departments and providing training for individuals who are performing these tests, I opposed these proposals both in my written responses and at the workshop as they would limit the very small pool of people who actually know the requirements and have performed these test. Having a NEBB certification clearly doesn’t make one qualified to perform these tests: the instructor wasn’t NEBB certified. Mark Hydeman, P.E., Fellow ASHRAE, Alameda, Calif. I am disappointed by “Ice Rink Uses CO2 System” in the March issue. CO2 as a refrigerant has some phenomenal characteristics. However, it is not suited for all applications; a transcritical refrigeration application has severe operating efficiency limitations that have been ignored. Mr. Simard indicates a transcritical CO2 system consumes 25% less energy than an ammonia system and provides enough hot water at 167°F to satisfy the building. These two facts, taken together, cannot be true. The efficiency of transcritical CO2 compressors varies tremendously. The compressor efficiency is most impacted by the discharge pressure and the outlet temperature of the gas cooler. Based on best case winter conditions with no heat reclaim, a CO2 transcritical compressor requires 1.3 hp/ton, which is less efficient than an ammonia compressor in an identical application. To recover heat for a hot water application, the energy consumption increases 55%. Moreover, the amount of useful heat to be recovered from a transcritical CO2 system is surprisingly
August 2012
CO2 Ice Rink
www.info.hotims.com/41642-27
10
ASHRAE Journal
ASHRAE Journal - August 2012
Table of Contents for the Digital Edition of ASHRAE Journal - August 2012
ASHRAE Journal - August 2012
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
2012– 13 Presidential Address: Broadening ASHRAE’s Horizons
Improving Energy Performance of NYC’s Existing Office Buildings
How 90.1-2010 Will Affect Health-Care Facilities
Technology Award Case Studies:
Ventilation for Museum
Sustainability at the Y
Standing Columns
Building Sciences
Special Section
InfoCenter
Emerging Technologies
Products
Refrigeration Applications
IAQ Applications
Washington Report
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - August 2012 - ASHRAE Journal - August 2012
ASHRAE Journal - August 2012 - Cover2
ASHRAE Journal - August 2012 - 1
ASHRAE Journal - August 2012 - 2
ASHRAE Journal - August 2012 - Contents
ASHRAE Journal - August 2012 - Commentary
ASHRAE Journal - August 2012 - 5
ASHRAE Journal - August 2012 - Industry News
ASHRAE Journal - August 2012 - 7
ASHRAE Journal - August 2012 - Letters
ASHRAE Journal - August 2012 - 9
ASHRAE Journal - August 2012 - 10
ASHRAE Journal - August 2012 - 11
ASHRAE Journal - August 2012 - 12
ASHRAE Journal - August 2012 - 13
ASHRAE Journal - August 2012 - Meetings and Shows
ASHRAE Journal - August 2012 - 15
ASHRAE Journal - August 2012 - 2012– 13 Presidential Address: Broadening ASHRAE’s Horizons
ASHRAE Journal - August 2012 - 17
ASHRAE Journal - August 2012 - 18
ASHRAE Journal - August 2012 - 19
ASHRAE Journal - August 2012 - 20
ASHRAE Journal - August 2012 - 21
ASHRAE Journal - August 2012 - 22
ASHRAE Journal - August 2012 - 23
ASHRAE Journal - August 2012 - 24
ASHRAE Journal - August 2012 - 25
ASHRAE Journal - August 2012 - 26
ASHRAE Journal - August 2012 - 27
ASHRAE Journal - August 2012 - Improving Energy Performance of NYC’s Existing Office Buildings
ASHRAE Journal - August 2012 - 29
ASHRAE Journal - August 2012 - 30
ASHRAE Journal - August 2012 - 31
ASHRAE Journal - August 2012 - 32
ASHRAE Journal - August 2012 - 33
ASHRAE Journal - August 2012 - 34
ASHRAE Journal - August 2012 - 35
ASHRAE Journal - August 2012 - 36
ASHRAE Journal - August 2012 - 37
ASHRAE Journal - August 2012 - 38
ASHRAE Journal - August 2012 - 39
ASHRAE Journal - August 2012 - How 90.1-2010 Will Affect Health-Care Facilities
ASHRAE Journal - August 2012 - 41
ASHRAE Journal - August 2012 - 42
ASHRAE Journal - August 2012 - 43
ASHRAE Journal - August 2012 - 44
ASHRAE Journal - August 2012 - 45
ASHRAE Journal - August 2012 - 46
ASHRAE Journal - August 2012 - 47
ASHRAE Journal - August 2012 - 48
ASHRAE Journal - August 2012 - 49
ASHRAE Journal - August 2012 - 50
ASHRAE Journal - August 2012 - 51
ASHRAE Journal - August 2012 - Ventilation for Museum
ASHRAE Journal - August 2012 - 53
ASHRAE Journal - August 2012 - 54
ASHRAE Journal - August 2012 - 55
ASHRAE Journal - August 2012 - Sustainability at the Y
ASHRAE Journal - August 2012 - 57
ASHRAE Journal - August 2012 - 58
ASHRAE Journal - August 2012 - 59
ASHRAE Journal - August 2012 - 60
ASHRAE Journal - August 2012 - 61
ASHRAE Journal - August 2012 - Building Sciences
ASHRAE Journal - August 2012 - 63
ASHRAE Journal - August 2012 - 64
ASHRAE Journal - August 2012 - 65
ASHRAE Journal - August 2012 - 66
ASHRAE Journal - August 2012 - 67
ASHRAE Journal - August 2012 - InfoCenter
ASHRAE Journal - August 2012 - 69
ASHRAE Journal - August 2012 - 70
ASHRAE Journal - August 2012 - 71
ASHRAE Journal - August 2012 - 72
ASHRAE Journal - August 2012 - 73
ASHRAE Journal - August 2012 - 74
ASHRAE Journal - August 2012 - 75
ASHRAE Journal - August 2012 - Emerging Technologies
ASHRAE Journal - August 2012 - 77
ASHRAE Journal - August 2012 - 78
ASHRAE Journal - August 2012 - 79
ASHRAE Journal - August 2012 - Products
ASHRAE Journal - August 2012 - 81
ASHRAE Journal - August 2012 - Refrigeration Applications
ASHRAE Journal - August 2012 - 83
ASHRAE Journal - August 2012 - IAQ Applications
ASHRAE Journal - August 2012 - 85
ASHRAE Journal - August 2012 - 86
ASHRAE Journal - August 2012 - 87
ASHRAE Journal - August 2012 - Washington Report
ASHRAE Journal - August 2012 - 89
ASHRAE Journal - August 2012 - Special Products
ASHRAE Journal - August 2012 - 91
ASHRAE Journal - August 2012 - 92
ASHRAE Journal - August 2012 - 93
ASHRAE Journal - August 2012 - 94
ASHRAE Journal - August 2012 - Classified Advertising
ASHRAE Journal - August 2012 - Advertisers Index
ASHRAE Journal - August 2012 - Cover3
ASHRAE Journal - August 2012 - Cover4
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