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- W1985227622 abstract "An untreated sewage source heat pump system directly makes use of the urban raw sewage instead of that treated by a sewage plant. At present In China, most systems adopt the indirect mode for avoiding the harmful effect of the sewage on the heat pump unit. In this article a direct-mode untreated sewage source heat pump system, which shows less theoretical analysis of the mathematical model, is theoretically designed and analyzed to simulate the system dynamic characteristics in the heating mode. The results show that the system COP changes from 4.1 to 3.4 and the heating capacity from 9.5 to 15.3 kW when the sewage inlet temperature is 12°C and the frequency increases from 18 to 32 HZ. The condenser heat-transfer coefficient increases with the frequency reducing while the change trend of evaporator heat-transfer coefficient is the opposite. The highest values of them are 303 and 1617 W.m−2•K−1, respectively. The frequency control simulation supplies the operation adjustment with theoretical instructions a..." @default.
- W1985227622 created "2016-06-24" @default.
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- W1985227622 date "2014-10-22" @default.
- W1985227622 modified "2023-10-17" @default.
- W1985227622 title "Frequency Control Characteristics of a Direct-Mode Untreated Sewage Source Heat Pump in the Heating Mode" @default.
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- W1985227622 doi "https://doi.org/10.1080/15435075.2014.891515" @default.
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