ASHRAE Journal - September 2009 - 20

The database currently houses data on eight commercial buildings, voluntarily reported by owners and architects. Some data sets are modeled for yet-to-be-constructed facilities; others include both modeled and end-use operating data. Each case study provides details on key energy efficiency and renewable energy technologies, a discussion of the NZEB definition(s) used, cost and financing information, and images of the project. In general, buildings with measured data in this database are fairly small (less than 14,000 ft2 [1300 m2]) one- or two-floor commercial buildings. The next generation of net zero energy buildings, as evident in the posters mentioned previously, will include larger commercial buildings such as K–12 schools and medium and large office buildings. One example under construction is the new Research Support Facilities (RSF) at DOE’s National Renewable Energy Laboratory (NREL) in Golden, Colo. This 218,000 ft2 (20 253 m2) administration and executive office space and data center will rely solely on renewable energy available on the roof and in the parking lot (NZEB:B Classification). At the point of building turnover, the energy goals are whole building energy use intensity of 25 kBtu/ft2·yr (284 MJ/ m2 · yr), LEED Platinum, and 50% energy savings. By including energy performance in the design/build acquisition process, NREL is attempting to ensure the energy models represent what is actually built. For example, to ensure the as-installed wall insulation represents the R-value in the energy model, installation preconstruction meetings are held to ensure the insulation is installed to minimize thermal breaks. NREL also specified plug loads to be used in the energy models, and encouraged the design team to identify efficiency strategies in the purchasing, control, and operations of the plug and process loads. Calibrating Expectations www.info.hotims.com/25208-50 In the quest for ever-greater precision in energy-performance measurement, we’ve uncovered the need for greater precision in definitions. What do people mean by net zero energy performance? Are they talking the same language and making the same assumptions? Aligning goals and expectations—as well as measurements—requires specificity. Conceptually, an NZEB is one that has no adverse energy or environmental impact associated with its operation. It is a building that is highly energy efficient and that is capable of fulfilling the balance of its energy needs using renewable energy technologies, producing at least as much energy over the course of a year as it draws from utility grids. It is also possible to have a grid-independent NZEB, with back-up energy needs supplied from renewable resources such as wood pellets or biodiesel. To hone this concept into a measurable and verifiable definition, the National September 2009 20 ASHRAE Journal

ASHRAE Journal - September 2009

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

ASHRAE Journal - September 2009
Contents
Commentary
Industry News
Letters
Meetings and Shows
Getting to Net Zero
Feature Articles
How High Can You Go? Building Height and Net Zero
Lab for Learning
Solar Hot-Water Heating System: Lessons Learned
50th Anniversary—Low Pressure Steam Heating Systems
Building Sciences
Products
Emerging Technologies
People
Classified Advertising
Advertisers Index
ASHRAE Journal - September 2009 - ASHRAE Journal - September 2009
ASHRAE Journal - September 2009 - Cover2
ASHRAE Journal - September 2009 - 1
ASHRAE Journal - September 2009 - 2
ASHRAE Journal - September 2009 - Contents
ASHRAE Journal - September 2009 - 4
ASHRAE Journal - September 2009 - Commentary
ASHRAE Journal - September 2009 - Industry News
ASHRAE Journal - September 2009 - 7
ASHRAE Journal - September 2009 - 8
ASHRAE Journal - September 2009 - 9
ASHRAE Journal - September 2009 - Letters
ASHRAE Journal - September 2009 - 11
ASHRAE Journal - September 2009 - 12
ASHRAE Journal - September 2009 - 13
ASHRAE Journal - September 2009 - 14
ASHRAE Journal - September 2009 - 15
ASHRAE Journal - September 2009 - Meetings and Shows
ASHRAE Journal - September 2009 - 17
ASHRAE Journal - September 2009 - Feature Articles
ASHRAE Journal - September 2009 - 19
ASHRAE Journal - September 2009 - 20
ASHRAE Journal - September 2009 - 21
ASHRAE Journal - September 2009 - 22
ASHRAE Journal - September 2009 - 23
ASHRAE Journal - September 2009 - 24
ASHRAE Journal - September 2009 - 25
ASHRAE Journal - September 2009 - How High Can You Go? Building Height and Net Zero
ASHRAE Journal - September 2009 - 27
ASHRAE Journal - September 2009 - 28
ASHRAE Journal - September 2009 - 29
ASHRAE Journal - September 2009 - 30
ASHRAE Journal - September 2009 - 31
ASHRAE Journal - September 2009 - 32
ASHRAE Journal - September 2009 - 32a
ASHRAE Journal - September 2009 - 32b
ASHRAE Journal - September 2009 - 33
ASHRAE Journal - September 2009 - 34
ASHRAE Journal - September 2009 - 35
ASHRAE Journal - September 2009 - 36
ASHRAE Journal - September 2009 - 37
ASHRAE Journal - September 2009 - Lab for Learning
ASHRAE Journal - September 2009 - 39
ASHRAE Journal - September 2009 - 40
ASHRAE Journal - September 2009 - 41
ASHRAE Journal - September 2009 - 42
ASHRAE Journal - September 2009 - 43
ASHRAE Journal - September 2009 - Solar Hot-Water Heating System: Lessons Learned
ASHRAE Journal - September 2009 - 45
ASHRAE Journal - September 2009 - 46
ASHRAE Journal - September 2009 - 47
ASHRAE Journal - September 2009 - 48
ASHRAE Journal - September 2009 - 49
ASHRAE Journal - September 2009 - 50
ASHRAE Journal - September 2009 - 51
ASHRAE Journal - September 2009 - 52
ASHRAE Journal - September 2009 - 53
ASHRAE Journal - September 2009 - 50th Anniversary—Low Pressure Steam Heating Systems
ASHRAE Journal - September 2009 - 55
ASHRAE Journal - September 2009 - 56
ASHRAE Journal - September 2009 - 57
ASHRAE Journal - September 2009 - 58
ASHRAE Journal - September 2009 - 59
ASHRAE Journal - September 2009 - 60
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ASHRAE Journal - September 2009 - 69
ASHRAE Journal - September 2009 - 70
ASHRAE Journal - September 2009 - 71
ASHRAE Journal - September 2009 - Building Sciences
ASHRAE Journal - September 2009 - 73
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ASHRAE Journal - September 2009 - 76
ASHRAE Journal - September 2009 - 77
ASHRAE Journal - September 2009 - 78
ASHRAE Journal - September 2009 - 79
ASHRAE Journal - September 2009 - 80
ASHRAE Journal - September 2009 - 81
ASHRAE Journal - September 2009 - Products
ASHRAE Journal - September 2009 - 83
ASHRAE Journal - September 2009 - Emerging Technologies
ASHRAE Journal - September 2009 - 85
ASHRAE Journal - September 2009 - 86
ASHRAE Journal - September 2009 - 87
ASHRAE Journal - September 2009 - 88
ASHRAE Journal - September 2009 - 89
ASHRAE Journal - September 2009 - People
ASHRAE Journal - September 2009 - 91
ASHRAE Journal - September 2009 - 92
ASHRAE Journal - September 2009 - Classified Advertising
ASHRAE Journal - September 2009 - 94
ASHRAE Journal - September 2009 - 95
ASHRAE Journal - September 2009 - Advertisers Index
ASHRAE Journal - September 2009 - Cover3
ASHRAE Journal - September 2009 - Cover4
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