A verification test of proposed ASHRAE Standard 152P, Standard Method of Test for Estimating the Efficiencies of Residential Thermal Distribution Systems, was performed by modifying an air-conditioner duct system to achieve measured, but variable, duct leakage. Computer-controlled dampers provided cycles of low leakage, supply leak only, return leak only, and both. This was repeated on a 12-day cycle. A house was extensively instrumented, and comprehensive short-term tests were run of the air conditioner, the thermal distribution system, and the house. Standard 152P was used to predict performance under the measured conditions and compared to the measured changes. With the supply leak damper open, 152P predicted that the air conditioner would have to deliver 18% more cooling at design to maintain occupant comfort. The field data were consistent with that estimate. Return leakage effects, however, were measured at double the 152P estimates.

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