ASHRAE Journal - February 2010 - 75

the annual energy cost by $1/ft2 ($11/m2). Yet, the lab building only performs 10% better than the baseline, while the office building performs 50% better. If one were to look at the percentage numbers only, one would think the lab performs very poorly. Energy Cost ($/ft2·yr) 12 10 9 10% Baseline Proposed 90.1 is a Floating Baseline Most clients, and even design team members, are not aware of the many nuances of Standard 90.1-2007 Appendix G, including that the appendix prescribes a floating baseline. Depending on the size and number of floors of a building, baseline HVAC systems and efficiencies vary. The baseline HVAC cooling plant for a 25,000 ft2 (2323 m2) building will be packaged constant volume air-cooled DX units (EER of 9 to 10), while a 250,000 ft2 (23 226 m2) building will have water-cooled centrifugal chillers (COP = 6.1) as a baseline. Both of these buildings are required to follow the same point scale for LEED, yet they are indirectly held to different standards of building systems. As a building becomes larger, the room for improvements in cooling generation efficiency is diminished. A smaller building has a wider envelope for achieving a high percentage savings over 90.1 than a larger one. Passive Solar Design? 4 2 1 0 Office 50% Lab Building Type Figure 2: Impact of building type on percentage energy cost reduction. Appendix G of Standard 90.1-2007 requires that building geometry between the baseline and proposed models be iden- tical. While Appendix G requires that the baseline be taken as the average of the model calculated for four orientations (as designed plus 90, 180, and 270 degree rotations), no direct credit is given for buildings truly designed with passive solar design principles. A building with poor massing is not penalized. www.info.hotims.com/27538-65 February 2010 ASHRAE Journal

ASHRAE Journal - February 2010

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

ASHRAE Journal - February 2010
Contents
Commentary
Industry News
Letters
Meetings and Shows
Heat Recovery In Retail Refrigeration
Using CO2 in Supermarkets
Demand-Based Control Of Lab Air Change Rates
Anniversary Feature: Improved Zoning Betters Department Store Air Conditioning
History of Radiant Heating & Cooling Systems, Part 2
Save Chiller Plant Energy With Guideline 22-2008
Building Sciences
ACREX 2010 Show Guide
Washington Report
InfoCenter
People
Technical Topics
Emerging Technologies
Special Products
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - February 2010 - ASHRAE Journal - February 2010
ASHRAE Journal - February 2010 - Cover2
ASHRAE Journal - February 2010 - 1
ASHRAE Journal - February 2010 - 2
ASHRAE Journal - February 2010 - Contents
ASHRAE Journal - February 2010 - 4
ASHRAE Journal - February 2010 - Commentary
ASHRAE Journal - February 2010 - Industry News
ASHRAE Journal - February 2010 - 7
ASHRAE Journal - February 2010 - 8
ASHRAE Journal - February 2010 - 9
ASHRAE Journal - February 2010 - Letters
ASHRAE Journal - February 2010 - 11
ASHRAE Journal - February 2010 - Meetings and Shows
ASHRAE Journal - February 2010 - 13
ASHRAE Journal - February 2010 - Heat Recovery In Retail Refrigeration
ASHRAE Journal - February 2010 - 15
ASHRAE Journal - February 2010 - 16
ASHRAE Journal - February 2010 - 17
ASHRAE Journal - February 2010 - 18
ASHRAE Journal - February 2010 - 19
ASHRAE Journal - February 2010 - 20
ASHRAE Journal - February 2010 - 21
ASHRAE Journal - February 2010 - 22
ASHRAE Journal - February 2010 - 23
ASHRAE Journal - February 2010 - Using CO2 in Supermarkets
ASHRAE Journal - February 2010 - 25
ASHRAE Journal - February 2010 - 26
ASHRAE Journal - February 2010 - 27
ASHRAE Journal - February 2010 - 28
ASHRAE Journal - February 2010 - 29
ASHRAE Journal - February 2010 - Demand-Based Control Of Lab Air Change Rates
ASHRAE Journal - February 2010 - 31
ASHRAE Journal - February 2010 - 32
ASHRAE Journal - February 2010 - Insert1
ASHRAE Journal - February 2010 - Insert2
ASHRAE Journal - February 2010 - 33
ASHRAE Journal - February 2010 - 34
ASHRAE Journal - February 2010 - 35
ASHRAE Journal - February 2010 - 36
ASHRAE Journal - February 2010 - 37
ASHRAE Journal - February 2010 - 38
ASHRAE Journal - February 2010 - 39
ASHRAE Journal - February 2010 - 40
ASHRAE Journal - February 2010 - 41
ASHRAE Journal - February 2010 - Anniversary Feature: Improved Zoning Betters Department Store Air Conditioning
ASHRAE Journal - February 2010 - 43
ASHRAE Journal - February 2010 - 44
ASHRAE Journal - February 2010 - 45
ASHRAE Journal - February 2010 - 46
ASHRAE Journal - February 2010 - 47
ASHRAE Journal - February 2010 - 48
ASHRAE Journal - February 2010 - 49
ASHRAE Journal - February 2010 - History of Radiant Heating & Cooling Systems, Part 2
ASHRAE Journal - February 2010 - 51
ASHRAE Journal - February 2010 - 52
ASHRAE Journal - February 2010 - 53
ASHRAE Journal - February 2010 - 54
ASHRAE Journal - February 2010 - 55
ASHRAE Journal - February 2010 - Save Chiller Plant Energy With Guideline 22-2008
ASHRAE Journal - February 2010 - 57
ASHRAE Journal - February 2010 - 58
ASHRAE Journal - February 2010 - 59
ASHRAE Journal - February 2010 - Building Sciences
ASHRAE Journal - February 2010 - 61
ASHRAE Journal - February 2010 - 62
ASHRAE Journal - February 2010 - 63
ASHRAE Journal - February 2010 - 64
ASHRAE Journal - February 2010 - ACREX 2010 Show Guide
ASHRAE Journal - February 2010 - S2
ASHRAE Journal - February 2010 - S3
ASHRAE Journal - February 2010 - S4
ASHRAE Journal - February 2010 - S5
ASHRAE Journal - February 2010 - S6
ASHRAE Journal - February 2010 - S7
ASHRAE Journal - February 2010 - S8
ASHRAE Journal - February 2010 - S9
ASHRAE Journal - February 2010 - S10
ASHRAE Journal - February 2010 - S11
ASHRAE Journal - February 2010 - S12
ASHRAE Journal - February 2010 - S13
ASHRAE Journal - February 2010 - S14
ASHRAE Journal - February 2010 - S15
ASHRAE Journal - February 2010 - S16
ASHRAE Journal - February 2010 - S17
ASHRAE Journal - February 2010 - S18
ASHRAE Journal - February 2010 - S19
ASHRAE Journal - February 2010 - S20
ASHRAE Journal - February 2010 - S21
ASHRAE Journal - February 2010 - S22
ASHRAE Journal - February 2010 - S23
ASHRAE Journal - February 2010 - S24
ASHRAE Journal - February 2010 - S25
ASHRAE Journal - February 2010 - S26
ASHRAE Journal - February 2010 - S27
ASHRAE Journal - February 2010 - S28
ASHRAE Journal - February 2010 - S29
ASHRAE Journal - February 2010 - S30
ASHRAE Journal - February 2010 - S31
ASHRAE Journal - February 2010 - S32
ASHRAE Journal - February 2010 - Washington Report
ASHRAE Journal - February 2010 - InfoCenter
ASHRAE Journal - February 2010 - 67
ASHRAE Journal - February 2010 - 68
ASHRAE Journal - February 2010 - 69
ASHRAE Journal - February 2010 - 70
ASHRAE Journal - February 2010 - 71
ASHRAE Journal - February 2010 - 72
ASHRAE Journal - February 2010 - People
ASHRAE Journal - February 2010 - Technical Topics
ASHRAE Journal - February 2010 - 75
ASHRAE Journal - February 2010 - 76
ASHRAE Journal - February 2010 - 77
ASHRAE Journal - February 2010 - Emerging Technologies
ASHRAE Journal - February 2010 - 79
ASHRAE Journal - February 2010 - 80
ASHRAE Journal - February 2010 - 81
ASHRAE Journal - February 2010 - 82
ASHRAE Journal - February 2010 - Special Products
ASHRAE Journal - February 2010 - Products
ASHRAE Journal - February 2010 - Classified Advertising
ASHRAE Journal - February 2010 - 86
ASHRAE Journal - February 2010 - 87
ASHRAE Journal - February 2010 - Advertisers Index
ASHRAE Journal - February 2010 - Cover3
ASHRAE Journal - February 2010 - Cover4
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