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a literature review, interview installers, distributers, and ASHP owners, create an inventory of existing ASHPs in Alaska, and model their economic and heating impact. Results of some of the CCHRC investigation and analysis should be available on the CCRHC website in 2013. http://www.cchrc.org When selecting an air source heat pump, look for the highest Heating Seasonal Performance Factor (HSPF) rating. The higher the HSPF rating of a unit, the more energy efficient the unit is. HSPF is a ratio of BTU heat output over the heating season to watt-hours of electricity used. These ratings are listed with the manufacture and can be verified by the US Green Star Energy Program. Ground Source Heat Pumps (GSHP) Ground-source heat pumps (GSHPs) are well-established systems that can economically heat and cool buildings in most locations, including Juneau. GSHP’s are in use throughout the United States and several have been installed in Juneau. GSHPs take advantage of moderate soil temperatures available year-round a short distance underground. Although many parts of the country experience seasonal temperature extremes -- from scorching heat in the summer to sub-zero cold in the winter—a few feet below the earth's surface the ground remains at a relatively constant temperature. Ground temperatures in Juneau range from 35°F to 60°F. There is some pubic data on ground temperatures on various locations in Juneau. This data is displayed in the table below: Ground Temperature Thermal Probes at location and depth shown. Juneau temperatures are shown in degrees F. Data collected December 13, 2002. These are the beginning temperature readings for the Winter 2002-2003 Table 3. Juneau Ground Temperatures in December Source CBJ Water Utility http://www.juneau.lib.ak.us/waterftp/temperature.htm Like a cave, this ground temperature is warmer than the air above it during the winter and cooler than the air in the summer. The GHP takes advantage of this by exchanging heat with the earth through a ground heat exchanger. Depth Tee Harbor Lower (inches) Lynn Canal Fire Mendenhall Dept. Valley Teslin St. Mid Mendenhall Valley Portage Blvd. Thread Lemon Needle St. Creek Water Utility Eighth North Crow Hill Street Douglas Douglas Juneau 1 12 57.3 35.84 41.47 41.3 42.89 43.17 43.47 43.77 2 24 50 35.75 40.84 41.4 42.54 43.32 43.71 43.71 3 48 56.3 35.77 39.95 40.84 42.06 42.5 43 43.33 4 60 60.1 35.77 41.38 42.31 43.81 44.05 44.21 44.27 10PDF Image | Heat Pump Technology
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