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THE ENERGETIC ANALYSIS OF AIR SOURCE HEAT PUMP`S DEFROSTING SYSTEMS.
Abstract
One of the major problems with exploitation of air heat pumps (ASHP) in the cold season, is frosting of outdoor heat exchangerпїЅs surface. A layer of frost accumulated on its surface, leads to decreased heating performance and energetic inefficiency. To restore the ASHPпїЅs nominal capacity, a defrosting process needs to be conducted periodically. The necessity of this procedure causes penalty energy usage, decreasing already low COP in result. Analyzing commonly used ASHP systems, some possibilities of energy efficiency improvement via perfecting their defrosting cycle were noticed. Eventually, a new ASHP defrosting system, based on a reversed refrigerant circuit with simultaneous reorganization of an air flow was developed. This new system is described in following paper. Basing on literature revive and own experimental research, the new defrosting system was compared against commonly used ones. Energy usage, duration of the process and temperature fluctuation during the defrost were considered and results are presented in this paper.
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