Achieving Very High Efficiency and Net Zero Energy in an Existing Home in a Hot-Humid Climate: Long-Term Utility and Monitoring Data (Revised) Page: 40 of 111
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
U.S. DEPARTMENT OF Energy Efficiency &
ENERGY Renewable Energy11 Attic and Garage Temperatures
Data analysis of the A/C load in 1990 revealed that with the A/C evaporator located in the
garage, its electricity demand was more closely linked to garage temperatures than to ambient
conditions. We also found with a gray shingle roof that the attic reached very high temperatures
with large potential heat gain to the attic duct system. The data illustrate the importance of the
thermal conditions in buffer spaces in determining A/C electricity demand when there is
substantial return side leakage that may be linked to these spaces. We also used developed data
to target retrofits to reduce cooling use.
Figures 19 and 20 show that the summertime temperatures in the garage and attic spaces in the
monitored home are quite high. The summer garage temperatures were almost always higher
than the ambient daily temperature-commonly exceeding 90 F. The difference between the
garage and ambient temperatures were most pronounced during the afternoon peak load hours.
The rapid drop in garage temperature on the final day shown was due to a sudden afternoon
rainstorm.garage
100 -
95 -LL
}
E
I-90 -
85 -
80 -
75 -
70--tamb
0 12 24 36 48 60 72
Hours: July 1 - 4th, 1990
Summertime Garage Temperatures are High84 96
Figure 19. Garage (green) against ambient air temperature (brown) over a four-day period in the
summer 199025
N IAA
,4 h /
--. Ii"
~J
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Parker, D. & Sherwin, J. Achieving Very High Efficiency and Net Zero Energy in an Existing Home in a Hot-Humid Climate: Long-Term Utility and Monitoring Data (Revised), report, October 1, 2012; Golden, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc837915/m1/40/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.