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MILNE, Murray et al. 2005 SOLAR WORLD CONGRESS, 2005, Orlando, Flórida. Anais... 2005. 6 p.
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Abstract

In order to compare the performance of three different cooling strategies (External Operable Shades, Internal Operable Shades, or a Whole-House Fan) in all 16 California climate zones, hourly performance data was recorded in a pair of full height test cells. The results were used to validate HEED (Home Energy Efficient Design), a whole-building energy simulation program. HEED automatically designed two 2000 sq.ft. houses, one to Meets the Energy Code, (California’s Title24), and the other that was a More Energy Efficient scheme. The California Energy Code (Title 24) requires a slightly different buildings in each of California’s 16 climate zones. On a state-wide basis these More Energy Efficient homes designed by HEED use about 35% less energy than the homes that Meet the Energy Code. One of the three cooling strategies was added to each of the two basecase homes in each climate In the Title 24 home the Whole-House fan is only half as good as either of the two Operable Shades. However in the More Energy Efficient home (that has more thermal mass) the Whole- House fan is significantly better than the Operable Shades, even to the point of eliminating the need to install an air conditioner in 10 of California’s 16 climate zones. The External and Internal Shades performed almost the same throughout the state, because in this simulation the more opaque External Shade required more indoor lighting along with its accompanying load on the air conditioning system. This modifies the traditional belief that External Shades are always more efficient. This study demonstrates once again why design matters. Small changes in the way a building is designed can make a significant difference in the amount of energy it uses.
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