ASHRAE Journal - June 2009 - 13

The Author Responds Thank you for highlighting the article published in 2004 on the same topic for schools. It was interesting to read that, though the applications were different, the actual analysis of the financial feasibility over the lifetime shows the same conclusion. Besides the points you have highlighted in your letter, reading through the 2004 article, I think some of the differences may also be attributed to the following. • Maintenance cost: Annual maintenance costs in the 2004 article were based on maintenance work being handled internally versus the 2009 costs, which were based on industry-wide market rates in the different regions. • Energy cost: Lighting density, and the associated air-conditioning loads, are different in both cases. Utility rates are different because of the time span and the location. Air-cooled reciprocating chillers were used in the 2004 article analysis versus screw chillers in the 2009 article. (This also impacts the first cost in both comparisons.) The school system in the 2004 article used a 30% solution of ethylene glycol versus water in the 2009 analysis. Because of the different applications (schools versus office buildings), the load profiles and the associated air-conditioning loads are different. • Equipment cost: Air-cooled reciprocating chiller versus screw chillers are used as noted earlier. Air-side and water-side costs were included for schools versus water-side only for the office analysis because the air-side for both systems (air- and water-cooled chillers) is essentially the same. Once again, thank you for highlighting this article. I especially enjoyed the fact that both arrived at the same conclusion. I think that the conclusion in your 2004 article summed it all up when it stated that “Looking only at the chiller energy consumption would lead one to install a water-cooled chiller rather than an air-cooled unit in a desert area. However, considering all of the factors: chiller efficiency, maintenance costs, cooling tower need, water treatment, etc., the air-cooled chiller system would save… about $100,000 through the life of the system.” Ramez Naguib, P.E., Member ASHRAE, Minneapolis Corporate Information Technology Services (651)414-3096, Riaz Hussain • Training/Support Services for all Honeywell Automation Systems • Circuit Board Repair/Parts available for all Systems. Most competitive prices • Systems Review, Repair, Support, Migration Paths, updates, Ads, Deletes, Mods • Fire Alarm Systems Training, Review, Repair, Support, Testing, NICET Training, HVAC Training • Service your own system with our support for a next to nothing dollar cost. Skip the high-dollar so-called “peace of mind” rip-offs ceyets.com or citshoneywellparts.com www.info.hotims.com/25205-12 www.info.hotims.com/25205-9 June 2009 ASHRAE Journal 13

ASHRAE Journal - June 2009

Table of Contents for the Digital Edition of ASHRAE Journal - June 2009

ASHRAE Journal - June 2009
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
      Improving Efficiency in Ice Hockey Arenas
      Climate Change and IEQ
     30 % Surplus OA: Does It Use More Energy?
     UFAD Commissioning for Air Force Base
     Tuning Control Loops: Nonlinearities and Anomalies
Health Issues
50th Anniversary: ASHAE/ASRE Merger
     The Making of a Society
     Domed Stadium Air-Conditioning Design
Building Sciences
Products
Emerging Technologies
Special Products
Classified Advertising
Advertising Index
ASHRAE Journal - June 2009 - ASHRAE Journal - June 2009
ASHRAE Journal - June 2009 - Cover2
ASHRAE Journal - June 2009 - 1
ASHRAE Journal - June 2009 - 2
ASHRAE Journal - June 2009 - Contents
ASHRAE Journal - June 2009 - 4
ASHRAE Journal - June 2009 - Commentary
ASHRAE Journal - June 2009 - Industry News
ASHRAE Journal - June 2009 - 7
ASHRAE Journal - June 2009 - 8
ASHRAE Journal - June 2009 - 9
ASHRAE Journal - June 2009 - Letters
ASHRAE Journal - June 2009 - 11
ASHRAE Journal - June 2009 - 12
ASHRAE Journal - June 2009 - 13
ASHRAE Journal - June 2009 - Meetings and Shows
ASHRAE Journal - June 2009 - 15
ASHRAE Journal - June 2009 -       Improving Efficiency in Ice Hockey Arenas
ASHRAE Journal - June 2009 - 17
ASHRAE Journal - June 2009 - 18
ASHRAE Journal - June 2009 - 19
ASHRAE Journal - June 2009 - 20
ASHRAE Journal - June 2009 - 21
ASHRAE Journal - June 2009 -       Climate Change and IEQ
ASHRAE Journal - June 2009 - 23
ASHRAE Journal - June 2009 -      30 % Surplus OA: Does It Use More Energy?
ASHRAE Journal - June 2009 - 25
ASHRAE Journal - June 2009 - 26
ASHRAE Journal - June 2009 - 27
ASHRAE Journal - June 2009 - 28
ASHRAE Journal - June 2009 - 29
ASHRAE Journal - June 2009 - 30
ASHRAE Journal - June 2009 - 31
ASHRAE Journal - June 2009 - 32
ASHRAE Journal - June 2009 - 32a
ASHRAE Journal - June 2009 - 32b
ASHRAE Journal - June 2009 - 32c
ASHRAE Journal - June 2009 - 32d
ASHRAE Journal - June 2009 - 33
ASHRAE Journal - June 2009 - 34
ASHRAE Journal - June 2009 - 35
ASHRAE Journal - June 2009 - 36
ASHRAE Journal - June 2009 - 37
ASHRAE Journal - June 2009 -      UFAD Commissioning for Air Force Base
ASHRAE Journal - June 2009 - 39
ASHRAE Journal - June 2009 - 40
ASHRAE Journal - June 2009 - 41
ASHRAE Journal - June 2009 - 42
ASHRAE Journal - June 2009 - 43
ASHRAE Journal - June 2009 - 44
ASHRAE Journal - June 2009 - 45
ASHRAE Journal - June 2009 -      Tuning Control Loops: Nonlinearities and Anomalies
ASHRAE Journal - June 2009 - 47
ASHRAE Journal - June 2009 - 48
ASHRAE Journal - June 2009 - B1
ASHRAE Journal - June 2009 - B2
ASHRAE Journal - June 2009 - 49
ASHRAE Journal - June 2009 - 50
ASHRAE Journal - June 2009 - 51
ASHRAE Journal - June 2009 - 52
ASHRAE Journal - June 2009 - 53
ASHRAE Journal - June 2009 - Health Issues
ASHRAE Journal - June 2009 - 55
ASHRAE Journal - June 2009 -      The Making of a Society
ASHRAE Journal - June 2009 - 57
ASHRAE Journal - June 2009 - 58
ASHRAE Journal - June 2009 - 59
ASHRAE Journal - June 2009 -      Domed Stadium Air-Conditioning Design
ASHRAE Journal - June 2009 - 61
ASHRAE Journal - June 2009 - 62
ASHRAE Journal - June 2009 - 63
ASHRAE Journal - June 2009 - 64
ASHRAE Journal - June 2009 - 65
ASHRAE Journal - June 2009 - 66
ASHRAE Journal - June 2009 - 67
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ASHRAE Journal - June 2009 - 70
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ASHRAE Journal - June 2009 - 72
ASHRAE Journal - June 2009 - 73
ASHRAE Journal - June 2009 - 74
ASHRAE Journal - June 2009 - 75
ASHRAE Journal - June 2009 - 76
ASHRAE Journal - June 2009 - 77
ASHRAE Journal - June 2009 - 78
ASHRAE Journal - June 2009 - 79
ASHRAE Journal - June 2009 - 80
ASHRAE Journal - June 2009 - Building Sciences
ASHRAE Journal - June 2009 - 82
ASHRAE Journal - June 2009 - 83
ASHRAE Journal - June 2009 - 84
ASHRAE Journal - June 2009 - 85
ASHRAE Journal - June 2009 - Products
ASHRAE Journal - June 2009 - 87
ASHRAE Journal - June 2009 - Emerging Technologies
ASHRAE Journal - June 2009 - 89
ASHRAE Journal - June 2009 - Special Products
ASHRAE Journal - June 2009 - 91
ASHRAE Journal - June 2009 - 92
ASHRAE Journal - June 2009 - 93
ASHRAE Journal - June 2009 - Classified Advertising
ASHRAE Journal - June 2009 - 95
ASHRAE Journal - June 2009 - Advertising Index
ASHRAE Journal - June 2009 - Cover3
ASHRAE Journal - June 2009 - Cover4
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