| 주 저자 | Beom-Jun Kim |
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| 공동 저자 | Su-Young Jo, Seheon Kim, Jae Won Joung, Jae-Weon Jeong |
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| 소속 | Department of Architectural Engineering, College of Engineering, Hanyang University |
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| Abstract | Recently, a cascade heat pump system was studied to be applied residential buildings for energy saving when supplying domestic hot water in cold regions in winter. The purpose of this study is to find the system operating conditions capable of supplying indoor air heating and domestic hot water, simultaneously. The system is consisted of two single-heat pump cycles connected through an intermediate heat exchanger. An additional heat exchanger is installed on the low-cycle heat pump for indoor heating. The refrigerants used in each heat pump system were R410A for low-cycle heat pump and R134a for high-cycle heat pump. The geothermal system was used as the low-cycle heat source. A geothermal simulator was used to simulate 10°C water obtained through the geothermal pipe in winter. The cascade heat pump system was installed in the basement of an experimental building and the experiment was conducted in the form of a field test. Since the indoor temperature in the basement was 15°C, the inlet temperature of the indoor unit was maintained as 15°C. The hot water temperature was maintained as 40°C by installing a water tank. In the experiment, the minimum and maximum compressor speed of the low-cycle compressor was 90 Hz to 160 Hz, and the compressor speed was adjusted by 10 Hz. The air volume on the indoor unit side was supplied at 600 CMH. The target indoor air heating load was 4.14 kW, and the domestic hot water load was 12.10 kW. At this time, the target was 40°C for air heating and 60°C for domestic hot water. As a result, when the low-cycle compressor speed was 160 Hz, the heat supply for indoor air heating reached 4.25 kW and the domestic hot water supply achieved 12.54 kW. The total energy consumption was 5.41 kW. The system COP was 3.10, which was derived the result of 4.8% improvement compared to the reference case where the low-cycle for indoor heating and high-cycle for water heating were separately operated under the same conditions. |
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| Keyword | Experimental investigation, Cascade heat pump, Building thermal load, Parametric study, Operation condition |
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| 페이지 | pp. 0~0 |
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| 논문 파일 |
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| 게재일시 |
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| DOI | - |
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| 학회/저널명 | APCBE 2023 |
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| 년도 | 2023 |
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| 추가 문구 | - |
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| 등록 일시 | 2025-06-18 19:04:48 |
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