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- W231169929 abstract "The report presents the final results of a study to investigate the transient operating characteristics and combined annual efficiencies of several different types of gas-fired combination space/water-heating systems. Transient characteristics were measured under cycling conditions representing both average and peak winter operation. Annual system efficiencies were determined using the proposed ASHRAE Standard 124P procedure for rating these appliances, and then compared to measured system efficiencies under cycling test conditions. The test results show that conventional gas-fired water heaters are capable of supplying both domestic hot water and space-heating loads even during peak winter design conditions when the components of the combination system are properly sized. The water heater designs generally provided good temperature stratification with an adequate supply of hot water. Under all but the most severe conditions, the warm air supply temperatures were in the range of 100 to 110 F (38 to 43 C) with 70 F (21 C) return air. Most important, there was good agreement between the results from the ASHRAE-124P tests and the measured-use tests in terms of recovery efficiency, energy factor, heating efficiency, and combined annual efficiency (CAE) for four different combination systems." @default.
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- W231169929 date "1992-04-01" @default.
- W231169929 modified "2023-09-27" @default.
- W231169929 title "Evaluation of combination space-heating/water-heating systems. Topical report, October 1989-August 1991" @default.
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