ASHRAE Journal - October 2010 - 65
solar zeb project
photo 2: Installing the last SIP on the roof.
photo 1: Installation of the first structural insulation panel.
photo 3: Completion of the building shell with windows, eaves, and house wrap. The photo was taken on the spring equinox (March 22). Note the overhang shadows at the top edge of the windows when exclusion of direct solar radiation begins.
Modeling zero energy
T
by ty Newell, Member ASHRAE; and ben Newell, Associate Member ASHRAE panel (SIP) construction and additional
here are no big secrets for building a zero energy house. A zero energy building (ZEB), relative to the climate, should be well insu-
lated, highly sealed and have appropriate windows. In future columns, we will discuss each of these items. In this column, we compare predicted Equinox House performance to actual energy data for similar sized homes to illustrate the performance differences between what we feel is a reasonable ZEB house design for our region (Urbana, Ill.) and typical, modern home construction as it exists in our area.
The basics of Equinox House performance are: R-value of 44 for the walls and roof and a well-sealed shell, achieving an infiltration rate of 0.37 ach at 0.20 in. w.c. (50 Pa), which is 170 cfm at 0.20 in. w.c. (80 L/s at 50 Pa)
for Equinox House volume. Windows are triple pane, low emissivity, and appropriate overhangs have been installed over the southern glazing. High shell performance was achieved with 12 in. (305 mm) thick structural insulated
foam and caulk sealing. Photo 1 shows the installation of the first SIP panel, and Photo 2 shows the house shell near completion. The completed house shell in Photo 3 shows the clerestory window overhang shadowing on March 22, the spring equinox. Within three weeks the shadow at the top edge of the clerestory windows will move completely over the windows to exclude direct sunlight from entering the house during the summer. Equinox House is designed to be a “zero plus” house, meaning it provides house operation energy and transportation energy. The 8.2 kW solar photovoltaic (PV) electric system is designed to provide all house annual energy requirements of two people plus enough energy for driving an electric vehicle 8,000 miles (12 875 km) per year.
this is the second in a series of columns. Find previous columns at www.ashrae.org/ashraejournal.
October 2010 ASHRAE Journal 65
ASHRAE Journal - October 2010
Table of Contents for the Digital Edition of ASHRAE Journal - October 2010
ASHRAE Journal - October 2010
Contents
Commentary
Industry News
Letters
Meetings and Shows
Using VAV to Limit Humidity at Part Load
Cleanroom Energy Efficiency
Ultra-Low GWP Refrigerants Global Regulations and Standards
HVAC for Prisons
ASHRAE Research Report
ASHRAE Honor Roll
Solar ZEB Project
Emerging Technologies
IAQ Applications
Commissioning
Washington Report
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - October 2010 - Intro
ASHRAE Journal - October 2010 - ASHRAE Journal - October 2010
ASHRAE Journal - October 2010 - Cover2
ASHRAE Journal - October 2010 - 1
ASHRAE Journal - October 2010 - 2
ASHRAE Journal - October 2010 - Contents
ASHRAE Journal - October 2010 - Commentary
ASHRAE Journal - October 2010 - 5
ASHRAE Journal - October 2010 - Industry News
ASHRAE Journal - October 2010 - 7
ASHRAE Journal - October 2010 - Letters
ASHRAE Journal - October 2010 - 9
ASHRAE Journal - October 2010 - 10
ASHRAE Journal - October 2010 - 11
ASHRAE Journal - October 2010 - 12
ASHRAE Journal - October 2010 - 13
ASHRAE Journal - October 2010 - 14
ASHRAE Journal - October 2010 - 15
ASHRAE Journal - October 2010 - Meetings and Shows
ASHRAE Journal - October 2010 - 17
ASHRAE Journal - October 2010 - Using VAV to Limit Humidity at Part Load
ASHRAE Journal - October 2010 - 19
ASHRAE Journal - October 2010 - 20
ASHRAE Journal - October 2010 - 21
ASHRAE Journal - October 2010 - 22
ASHRAE Journal - October 2010 - 23
ASHRAE Journal - October 2010 - Cleanroom Energy Efficiency
ASHRAE Journal - October 2010 - 25
ASHRAE Journal - October 2010 - 26
ASHRAE Journal - October 2010 - 27
ASHRAE Journal - October 2010 - 28
ASHRAE Journal - October 2010 - 29
ASHRAE Journal - October 2010 - 30
ASHRAE Journal - October 2010 - 31
ASHRAE Journal - October 2010 - 32
ASHRAE Journal - October 2010 - A1
ASHRAE Journal - October 2010 - A2
ASHRAE Journal - October 2010 - A3
ASHRAE Journal - October 2010 - A4
ASHRAE Journal - October 2010 - A5
ASHRAE Journal - October 2010 - A6
ASHRAE Journal - October 2010 - A7
ASHRAE Journal - October 2010 - A8
ASHRAE Journal - October 2010 - A9
ASHRAE Journal - October 2010 - A10
ASHRAE Journal - October 2010 - A11
ASHRAE Journal - October 2010 - A12
ASHRAE Journal - October 2010 - 33
ASHRAE Journal - October 2010 - Ultra-Low GWP Refrigerants Global Regulations and Standards
ASHRAE Journal - October 2010 - 35
ASHRAE Journal - October 2010 - 36
ASHRAE Journal - October 2010 - 37
ASHRAE Journal - October 2010 - 38
ASHRAE Journal - October 2010 - 39
ASHRAE Journal - October 2010 - 40
ASHRAE Journal - October 2010 - 41
ASHRAE Journal - October 2010 - 42
ASHRAE Journal - October 2010 - 43
ASHRAE Journal - October 2010 - HVAC for Prisons
ASHRAE Journal - October 2010 - 45
ASHRAE Journal - October 2010 - 46
ASHRAE Journal - October 2010 - 47
ASHRAE Journal - October 2010 - 48
ASHRAE Journal - October 2010 - 49
ASHRAE Journal - October 2010 - 50
ASHRAE Journal - October 2010 - 51
ASHRAE Journal - October 2010 - ASHRAE Research Report
ASHRAE Journal - October 2010 - 53
ASHRAE Journal - October 2010 - 54
ASHRAE Journal - October 2010 - 55
ASHRAE Journal - October 2010 - 56
ASHRAE Journal - October 2010 - 57
ASHRAE Journal - October 2010 - 58
ASHRAE Journal - October 2010 - 59
ASHRAE Journal - October 2010 - 60
ASHRAE Journal - October 2010 - 61
ASHRAE Journal - October 2010 - 62
ASHRAE Journal - October 2010 - 63
ASHRAE Journal - October 2010 - 64
ASHRAE Journal - October 2010 - ASHRAE Honor Roll
ASHRAE Journal - October 2010 - HR2
ASHRAE Journal - October 2010 - HR3
ASHRAE Journal - October 2010 - HR4
ASHRAE Journal - October 2010 - HR5
ASHRAE Journal - October 2010 - HR6
ASHRAE Journal - October 2010 - HR7
ASHRAE Journal - October 2010 - HR8
ASHRAE Journal - October 2010 - HR9
ASHRAE Journal - October 2010 - HR10
ASHRAE Journal - October 2010 - HR11
ASHRAE Journal - October 2010 - HR12
ASHRAE Journal - October 2010 - HR13
ASHRAE Journal - October 2010 - HR14
ASHRAE Journal - October 2010 - HR15
ASHRAE Journal - October 2010 - HR16
ASHRAE Journal - October 2010 - HR17
ASHRAE Journal - October 2010 - HR18
ASHRAE Journal - October 2010 - HR19
ASHRAE Journal - October 2010 - HR20
ASHRAE Journal - October 2010 - HR21
ASHRAE Journal - October 2010 - HR22
ASHRAE Journal - October 2010 - HR23
ASHRAE Journal - October 2010 - HR24
ASHRAE Journal - October 2010 - HR25
ASHRAE Journal - October 2010 - HR26
ASHRAE Journal - October 2010 - HR27
ASHRAE Journal - October 2010 - HR28
ASHRAE Journal - October 2010 - HR29
ASHRAE Journal - October 2010 - HR30
ASHRAE Journal - October 2010 - HR31
ASHRAE Journal - October 2010 - HR32
ASHRAE Journal - October 2010 - 64a
ASHRAE Journal - October 2010 - 64b
ASHRAE Journal - October 2010 - 64c
ASHRAE Journal - October 2010 - 64d
ASHRAE Journal - October 2010 - Solar ZEB Project
ASHRAE Journal - October 2010 - 66
ASHRAE Journal - October 2010 - 67
ASHRAE Journal - October 2010 - 68
ASHRAE Journal - October 2010 - 69
ASHRAE Journal - October 2010 - Emerging Technologies
ASHRAE Journal - October 2010 - 71
ASHRAE Journal - October 2010 - 72
ASHRAE Journal - October 2010 - 73
ASHRAE Journal - October 2010 - 74
ASHRAE Journal - October 2010 - 75
ASHRAE Journal - October 2010 - IAQ Applications
ASHRAE Journal - October 2010 - 77
ASHRAE Journal - October 2010 - 78
ASHRAE Journal - October 2010 - 79
ASHRAE Journal - October 2010 - 80
ASHRAE Journal - October 2010 - 81
ASHRAE Journal - October 2010 - 82
ASHRAE Journal - October 2010 - 83
ASHRAE Journal - October 2010 - Commissioning
ASHRAE Journal - October 2010 - 85
ASHRAE Journal - October 2010 - 86
ASHRAE Journal - October 2010 - 87
ASHRAE Journal - October 2010 - 88
ASHRAE Journal - October 2010 - 89
ASHRAE Journal - October 2010 - Washington Report
ASHRAE Journal - October 2010 - 91
ASHRAE Journal - October 2010 - Special Products
ASHRAE Journal - October 2010 - 93
ASHRAE Journal - October 2010 - Classified Advertising
ASHRAE Journal - October 2010 - 95
ASHRAE Journal - October 2010 - Advertisers Index
ASHRAE Journal - October 2010 - Cover3
ASHRAE Journal - October 2010 - Cover4
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