Experimental and Energy Performance Study of Cascade Heat Pump System with Renewable Heat Sources for Air and Water Heating

Beom-Jun Kim; Jae-Weon Jeong

doi:10.22696/jkiaebs.20240030

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2024 Vol.18, Issue 4 Preview Page Next Page

Research Article

Experimental and Energy Performance Study of Cascade Heat Pump System with Renewable Heat Sources for Air and Water Heating 신재생열원 적용에 따른 캐스케이드 히트펌프의 급탕 및 공기난방에 대한 실험 및 에너지 성능 연구

30 August 2024. pp. 353-362

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Abstract

The purpose of this study is to conduct an experimental performance evaluation applying renewable heat sources to the cascade heat pump system compared to the air source in the winter. The renewable heat sources applied are geothermal and solar heat sources. The cascade heat pump supplies hot water from a high-cycle heat pump and air heating from a low-cycle heat pump. For the experiment, the cascade heat pump was manufactured and installed on the basement floor of the experimental building. The air source was supplied by an outdoor unit, the geothermal source by a geothermal simulator, and the solar source by a photovoltaic-thermal panel. The average value of the measured values for 10 minutes after the system was stabilized was used. The experimental results showed that applying renewable heat sources resulted in improved results in terms of heat capacity and supply fluid temperature, and the system COP was confirmed to have a performance improvement effect of 10.7% for the geothermal source and 6.1% for the solar source compared to the air source. This is the result of improved system performance while satisfying both the indoor heating load and the domestic hot water load flow rate. On the other hand, the temperature of the solar heat source was higher than that of the geothermal source, but low performance was derived. This is because the circulation flow of the solar heat source was circulated at 27% of that of the geothermal source, so relatively little heat was supplied to the heat pump. The cascade heat pump system of this study was installed with the indoor unit after the intermediate heat exchanger for domestic hot water. Therefore, a large amount of heat was supplied to the domestic hot water side. The performance of heating and domestic hot water can be affected depending on the installation order of the heat exchanger, regardless of the type and supply temperature of the heat source.

Keywords

캐스케이드 히트펌프

신재생열원

공기난방

급탕

성능 평가

키워드

Cascade heat pump

Renewable heat source

Indoor air heating

Domestic hot water

Performance evaluation

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Information

Publisher :Korean Institute of Architectural Sustainable Environment and Building Systems
Publisher(Ko) :한국건축친환경설비학회
Journal Title :Journal of Korean Institute of Architectural Sustainable Environment and Building Systems
Journal Title(Ko) :한국건축친환경설비학회논문집
Volume : 18
No :4
Pages :353-362
Received Date : 2024-08-05
Revised Date : 2024-08-16
Accepted Date : 2024-08-16
DOI :https://doi.org/10.22696/jkiaebs.20240030

Journal of Korean Institute of Architectural Sustainable Environment and Building Systems ISSN:1976-6483(Print) 2586-0666(Online) 한국건축친환경설비학회논문집

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