International Appliance Manufacturing 2008 - (Page 34) Figure 8: Wind tunnel Performance Comparison - Baseline 1 stack motor. All other motors referenced in this paper have a 3/8” stack height. Table 4 shows preliminary data of the prototype 110mm PAX fan with A. O. Smith motor compared to its 110mm baseline counterpart, “Baseline 4.” Initial results look promising as the PAX fan with A. O. Smith motor has similar output but uses 36% less power. The “PAX/AO 4” system was tested at 87 volts and a new motor is being designed that will provide the same electro-mechanical performance at 115 volts, maintaining the power savings. Results - in Unit Power savings noted through bench or wind tunnel testing is encouraging but the ultimate value of a reduced power evap system is found in total energy savings of the refrigerator. Refrigerators can be tested for daily energy consumption using ASHRAE Standard 117-1992, “Method of Testing Closed Refrigerators.” Freezer and refrigerator compartments are maintained at specified temperatures while total energy used by the refrigerator is recorded in kW-hours/day. In a single unit three day test conducted in the A. O. Smith laboratories the “PAX/AO 1” system reduced daily energy consumption over “Baseline 1” by 3.9% (see Table 5). This is especially significant considering that there are other components contributing to Table 1: Data from Wind tunnel - Baseline 1 Table 2: Sound Comparison - Baseline 1 Table 3: Data from Wind tunnel - Baselines 2 and 3 34 International Appliance Manufacturing 2008
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