Frost retardation of an air-source heat pump by the hot gas bypass method

Ju Suk Byun; Jinho Lee; Chang Duk Jeon

doi:10.1016/j.ijrefrig.2007.05.006

Frost retardation of an air-source heat pump by the hot gas bypass method

Ju Suk Byun, Jinho Lee, Chang Duk Jeon

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

69 Citations (Scopus)

Abstract

This study is concerned with a hot gas (refrigerant) bypass method to retard the formation and propagation of frost in an air-source heat pump. The feasibility of the hot gas bypass method was investigated experimentally and the method's performance is compared with that of a normal, 1.12 kW capacity air-source heat pump system with no defrost equipment such as an electric resistance heater. Results indicate that the hot gas bypass method is useful for retarding the formation and growth of frost at the outdoor coil. The best performance is shown under a bypass refrigerant flow rate of 0.2 kg/min (20% of the whole system refrigerant flow rate). During 210 min of heat pump operation, the hot gas bypass method improved COP and heating capacity at an average of 8.5% and 5.7%, respectively, relative to the normal system.

Original language	English
Pages (from-to)	328-334
Number of pages	7
Journal	International Journal of Refrigeration
Volume	31
Issue number	2
DOIs	https://doi.org/10.1016/j.ijrefrig.2007.05.006
Publication status	Published - 2008 Mar

Bibliographical note

Funding Information:
Heat Pump Technology: A Survey of Technical Developments, Market Prospects and Research Needs, 1978. HCP/M2121-01, UC95d, Report prepared by Gardian Associates, Inc. for U.S. DOE under contract no. EX-76-C-01-2121.

All Science Journal Classification (ASJC) codes

Building and Construction
Mechanical Engineering

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10.1016/j.ijrefrig.2007.05.006

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title = "Frost retardation of an air-source heat pump by the hot gas bypass method",

abstract = "This study is concerned with a hot gas (refrigerant) bypass method to retard the formation and propagation of frost in an air-source heat pump. The feasibility of the hot gas bypass method was investigated experimentally and the method's performance is compared with that of a normal, 1.12 kW capacity air-source heat pump system with no defrost equipment such as an electric resistance heater. Results indicate that the hot gas bypass method is useful for retarding the formation and growth of frost at the outdoor coil. The best performance is shown under a bypass refrigerant flow rate of 0.2 kg/min (20% of the whole system refrigerant flow rate). During 210 min of heat pump operation, the hot gas bypass method improved COP and heating capacity at an average of 8.5% and 5.7%, respectively, relative to the normal system.",

author = "Byun, {Ju Suk} and Jinho Lee and Jeon, {Chang Duk}",

note = "Funding Information: Heat Pump Technology: A Survey of Technical Developments, Market Prospects and Research Needs, 1978. HCP/M2121-01, UC95d, Report prepared by Gardian Associates, Inc. for U.S. DOE under contract no. EX-76-C-01-2121. ",

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AB - This study is concerned with a hot gas (refrigerant) bypass method to retard the formation and propagation of frost in an air-source heat pump. The feasibility of the hot gas bypass method was investigated experimentally and the method's performance is compared with that of a normal, 1.12 kW capacity air-source heat pump system with no defrost equipment such as an electric resistance heater. Results indicate that the hot gas bypass method is useful for retarding the formation and growth of frost at the outdoor coil. The best performance is shown under a bypass refrigerant flow rate of 0.2 kg/min (20% of the whole system refrigerant flow rate). During 210 min of heat pump operation, the hot gas bypass method improved COP and heating capacity at an average of 8.5% and 5.7%, respectively, relative to the normal system.

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