Ashrae Journal - December 2008 - 14

ate control strategy and provides the added benefit of improved control for highly variable latent loaded spaces and an opportunity for additional fan energy savings. Operating at 1–1.2 in. w.c. (250–300 Pa) plenum pressures need not have a dramatic effect on fan energy if an extended plenum duct design is applied to the system, minimizing downstream duct pressure losses. This pressure, otherwise lost in duct air transport, is then available for more beam capacity with little waste and would share the duct design philosophy prescribed by REHVA. We do not contest the facts presented as observations made in the submitted letter, and concede that all are valid points, save the suggestion that comfort would most certainly be compromised. Depending on the project conditions and design, these suggestions are an excellent opportunity to extend the savings potential of this technology. We are simply offering a design approach that uses the advantages offered by modern building automation and provides an optimization of capital costs without sacrificing comfort, provided the system is coupled to an appropriate control system. Traditionally, North American buildings have been designed for shorter life spans than their European counterparts. Thus, the amortization of the additional costs relative to a European design philosophy is, in our opinion, more difficult to justify. Incrementally, the minute decrease in operating efficiency provides substantial capital cost savings and remains infinitely superior to many competing HVAC technologies. As such, our approach may remain of interest to design consultants and building owners until such time as the increased capital investment can be justified in terms of additional active chilled beams vis-à-vis energy costs in North America or longer building life cycles are adopted. Darren Alexander, P.Eng., Nisku, AB, Canada Mike O’Rourke, Highlands Ranch, Colo. www.info.hotims.com/16020-9 14 ASHRAE Journal December 2008

Ashrae Journal - December 2008

Table of Contents for the Digital Edition of Ashrae Journal - December 2008

Ashrae Journal - December 2008
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Selecting CO2 Criteria for Outdoor Air Monitoring
Chilled Beams for Labs: Using Dual Energy Recovery
Understanding Fuel Savings in the Boiler Room
Engineering-Centric BIM
Refrigeration for Ships
Building Sciences
New Product Preview
Special Products
Feature Indices
Classified Advertising
Advertising Index
Ashrae Journal - December 2008 - Ashrae Journal - December 2008
Ashrae Journal - December 2008 - Cover2
Ashrae Journal - December 2008 - 1
Ashrae Journal - December 2008 - 2
Ashrae Journal - December 2008 - Contents
Ashrae Journal - December 2008 - 4
Ashrae Journal - December 2008 - Commentary
Ashrae Journal - December 2008 - 6
Ashrae Journal - December 2008 - 7
Ashrae Journal - December 2008 - Industry News
Ashrae Journal - December 2008 - 9
Ashrae Journal - December 2008 - 10
Ashrae Journal - December 2008 - 11
Ashrae Journal - December 2008 - Letters
Ashrae Journal - December 2008 - 13
Ashrae Journal - December 2008 - 14
Ashrae Journal - December 2008 - 15
Ashrae Journal - December 2008 - Meetings and Shows
Ashrae Journal - December 2008 - 17
Ashrae Journal - December 2008 - Selecting CO2 Criteria for Outdoor Air Monitoring
Ashrae Journal - December 2008 - 19
Ashrae Journal - December 2008 - 20
Ashrae Journal - December 2008 - 21
Ashrae Journal - December 2008 - 22
Ashrae Journal - December 2008 - 23
Ashrae Journal - December 2008 - 24
Ashrae Journal - December 2008 - 25
Ashrae Journal - December 2008 - 26
Ashrae Journal - December 2008 - 27
Ashrae Journal - December 2008 - Chilled Beams for Labs: Using Dual Energy Recovery
Ashrae Journal - December 2008 - 29
Ashrae Journal - December 2008 - 30
Ashrae Journal - December 2008 - 31
Ashrae Journal - December 2008 - 32
Ashrae Journal - December 2008 - 33
Ashrae Journal - December 2008 - 34
Ashrae Journal - December 2008 - 35
Ashrae Journal - December 2008 - 36
Ashrae Journal - December 2008 - 37
Ashrae Journal - December 2008 - Understanding Fuel Savings in the Boiler Room
Ashrae Journal - December 2008 - 39
Ashrae Journal - December 2008 - 40
Ashrae Journal - December 2008 - 41
Ashrae Journal - December 2008 - 42
Ashrae Journal - December 2008 - 43
Ashrae Journal - December 2008 - Engineering-Centric BIM
Ashrae Journal - December 2008 - 45
Ashrae Journal - December 2008 - 46
Ashrae Journal - December 2008 - 47
Ashrae Journal - December 2008 - 48
Ashrae Journal - December 2008 - 49
Ashrae Journal - December 2008 - Refrigeration for Ships
Ashrae Journal - December 2008 - 51
Ashrae Journal - December 2008 - 52
Ashrae Journal - December 2008 - 53
Ashrae Journal - December 2008 - 54
Ashrae Journal - December 2008 - 55
Ashrae Journal - December 2008 - 56
Ashrae Journal - December 2008 - 57
Ashrae Journal - December 2008 - 58
Ashrae Journal - December 2008 - 59
Ashrae Journal - December 2008 - Building Sciences
Ashrae Journal - December 2008 - 61
Ashrae Journal - December 2008 - 62
Ashrae Journal - December 2008 - 63
Ashrae Journal - December 2008 - 72
Ashrae Journal - December 2008 - 64
Ashrae Journal - December 2008 - 65
Ashrae Journal - December 2008 - 66
Ashrae Journal - December 2008 - New Product Preview
Ashrae Journal - December 2008 - 68
Ashrae Journal - December 2008 - 69
Ashrae Journal - December 2008 - 70
Ashrae Journal - December 2008 - 71
Ashrae Journal - December 2008 - 72a
Ashrae Journal - December 2008 - 72b
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Ashrae Journal - December 2008 - 123
Ashrae Journal - December 2008 - 124
Ashrae Journal - December 2008 - 125
Ashrae Journal - December 2008 - Special Products
Ashrae Journal - December 2008 - 127
Ashrae Journal - December 2008 - 128
Ashrae Journal - December 2008 - Feature Indices
Ashrae Journal - December 2008 - 130
Ashrae Journal - December 2008 - 131
Ashrae Journal - December 2008 - 132
Ashrae Journal - December 2008 - Classified Advertising
Ashrae Journal - December 2008 - 134
Ashrae Journal - December 2008 - 135
Ashrae Journal - December 2008 - Advertising Index
Ashrae Journal - December 2008 - Cover3
Ashrae Journal - December 2008 - Cover4
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