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A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part II: Modeling analysis
Qu, Minglu; Pan, Dongmei; Xia, Liang; Deng, Shiming; … - In: Applied Energy 91 (2012) 1, pp. 274-280
two-part series, reports on a modeling analysis where a semi-empirical model of the airside defrosting in the four …
Persistent link: https://www.econbiz.de/10010576276
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Utilization and performance evaluation of a surplus air heat pump system for greenhouse cooling and heating
Yang, Seung-Hwan; Rhee, Joong Yong - In: Applied Energy 105 (2013) C, pp. 244-251
Energy conserving is an important issue in greenhouse farming. Because greenhouse operations consume large amount of fossil fuel energy, energy conservation is necessary for securing famers’ income and alleviating global warming. Surplus air thermal energy (SATE) in greenhouses exists even in...
Persistent link: https://www.econbiz.de/10010635994
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Probabilistic modeling and assessment of the impact of electric heat pumps on low voltage distribution networks
Navarro-Espinosa, Alejandro; Mancarella, Pierluigi - In: Applied Energy 127 (2014) C, pp. 249-266
is capable of properly addressing single-phase connections, adequately modeling the unbalanced nature of LV networks …
Persistent link: https://www.econbiz.de/10010776604
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A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part I: Experiments
Qu, Minglu; Xia, Liang; Deng, Shiming; Jiang, Yiqiang - In: Applied Energy 91 (2012) 1, pp. 122-129
provided. In the second part of the series, a modeling analysis on the effects of downwards flowing of the melted frost along …
Persistent link: https://www.econbiz.de/10010576312
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An experimental investigation on reverse-cycle defrosting performance for an air source heat pump using an electronic expansion valve
Qu, Minglu; Xia, Liang; Deng, Shiming; Jiang, Yiqiang - In: Applied Energy 97 (2012) C, pp. 327-333
When an air source heat pump (ASHP) operates in heating mode, frost can be accumulated on the surface of its finned outdoor coil. Frosting deteriorates the operation and energy efficiency of the ASHP and periodic defrosting becomes necessary. Currently the most widely used standard defrosting...
Persistent link: https://www.econbiz.de/10010702403
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Investigation of defrosting water retention on the surface of evaporator impacting the performance of air source heat pump during periodic frosting–defrosting cycles
Li, L.T.; Wang, W.; Sun, Y.Y.; Feng, Y.C.; Lu, W.P.; … - In: Applied Energy 135 (2014) C, pp. 98-107
To investigate the impact of defrosting-water retention on the surface of heat exchangers of the air source heat pump (ASHP) performance during frosting–defrosting cycles, an experimental study has been conducted. Testing was carried out in a controlled-environment chamber with ASHP...
Persistent link: https://www.econbiz.de/10011076473
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Field test investigation of the characteristics for the air source heat pump under two typical mal-defrost phenomena
Wang, W.; Xiao, J.; Guo, Q.C.; Lu, W.P.; Feng, Y.C. - In: Applied Energy 88 (2011) 12, pp. 4470-4480
A study is presented on the characteristics of the air source heat pump (ASHP) under two kinds of typical mal-defrost phenomena. The definition of the “Mal-defrost phenomena” is put forward, and the possible origins of their occurrence are analyzed. It is concluded that the current defrost...
Persistent link: https://www.econbiz.de/10011040513
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Performances of air source heat pump system for a kind of mal-defrost phenomenon appearing in moderate climate conditions
Wang, W.; Feng, Y.C.; Zhu, J.H.; Li, L.T.; Guo, Q.C.; … - In: Applied Energy 112 (2013) C, pp. 1138-1145
To quantify the performance drop of the air source heat pump (ASHP) system under a special kind of mal-defrost phenomenon appearing in moderate climate conditions, a field test was conducted for 8days at the initial stage of a heating season in Beijing, China. The mal-defrost was found with the...
Persistent link: https://www.econbiz.de/10011040860
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A novel defrosting method using heat energy dissipated by the compressor of an air source heat pump
Long, Zhang; Jiankai, Dong; Yiqiang, Jiang; Yang, Yao - In: Applied Energy 133 (2014) C, pp. 101-111
When an air source heat pump (ASHP) unit is used for space heating at low ambient temperatures in winter, frost may form on its outdoor coil surface. Since the accumulated frost adversely affects its performance and energy efficiency, periodic defrosting of the outdoor coil is necessary....
Persistent link: https://www.econbiz.de/10011041471
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An experimental study on the negative effects of downwards flow of the melted frost over a multi-circuit outdoor coil in an air source heat pump during reverse cycle defrosting
Song, Mengjie; Pan, Dongmei; Li, Ning; Deng, Shiming - In: Applied Energy 138 (2015) C, pp. 598-604
When the surface temperature of the outdoor coil in an air source heat pump (ASHP) unit is lower than both freezing point of water and the air dew point, frost can be formed and accumulated over outdoor coil surface. Frosting affects the energy efficiency, and periodic defrosting therefore is...
Persistent link: https://www.econbiz.de/10011116053