期刊
APPLIED THERMAL ENGINEERING
卷 162, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.114159
关键词
Natural gas; Hot water; Space heating; Ejector; Heat pump; Compressor
资金
- National Natural Science Foundation of China [51638010, 51578306]
- Innovative Research Group of the National Natural Science Foundation of China [51521005]
Natural gas is widely used for space heating because of its low pollutant emissions and high combustion efficiency. Nevertheless, the primary energy efficiency of a gas-fired boiler cannot exceed 100% based on high calorific value. In order to improve the efficiency of natural gas for heating, a gas-fired hot water system with a compression-enhanced ejector heat pump is proposed. The simulation results show that the compressor can sustain the ejector's high efficiency range while in operation. When the ambient temperature is 0 degrees C, the primary energy efficiency is substantially higher than that of the conventional ejector heat pump system and gas-fired boiler by 40 and 36%, respectively. When the supply water temperature does not exceed 46 degrees C, the coefficient of performance and primary energy efficiency of the novel gas-fired hot water system can reach 1.65 and 1.22, respectively.
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