[PDF] Novel defrost techniques on air source heat pumps


Download Novel defrost techniques on air source heat pumps complete Project Report.

Novel defrost techniques on air source heat pumps complete Project Report – PDF Free Download

Novel defrost techniques on air source heat pumps

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Abstract:

This study aimed to reach a new solution for the defrost problem for air source heat pumps. In order to achieve this goal, the study was divided in 3 different parts. A literature survey about what the industry and the academy are utilizing now; a benchmark study with products that fit in a specific range of characteristics and then select and try one of the feasible solutions in the laboratory.

A literature survey was done to search for alternative solutions for the defrost for air source heat pumps. Multiple types of solutions were found and they can be divided on electric defrost, hot gas injection methods, advanced circuiting systems, pre-dry treatment of air, surface treatment of the heat exchanger, thermal energy storage and other type of solutions that cannot be placed in the previous tags.

The benchmark study was done simultaneously with the literature survey and two products of 9000 Btu/h of heating capacity were dismounted and tested in the psychrometric chamber of Electrolux AB in Stockholm. The results were different and some conclusions were achieved, but the main difference between the units was the condensation temperature during defrost, which is related to a higher heat exchange between the refrigerant and the frost, also was noticed that the control of the compressor and electronic expansion valve, a high optimization of these can improve substantially the defrost of an air source heat pump.

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