논문 해외 국제전문학술지(SCI급) PERFORMANCE ANALYSIS OF HYBRID SOLAR-GEOTHERMAL CO2 HEAT PUMP SYSTEM FOR RESIDENTIAL HEATING
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2013-02
- 저자명 최정민
- 학술지명 RENEWABLE ENERGY
- 발행처명 PERGAMON-ELSEVIER SCIENCE LTD
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 3
홈페이지논문 초록 (Abstract)
A simulation study of hybrid solar-geothermal heat pump system for residential applications using carbon dioxide was carriedout unde r different operating conditions. The system consists of a solar uni t (concentric evacuated tube solar collector and heat storage tank) and a CO2 heat pump unit (three double-pipe heat exchangers, electric expansion valve, and compressor). As a result, the differential of pressure ratio between the inlet and the outlet of the compress or increasesby 19.9%. and the compressor work increases from 4.5 to 5.3 kW when the operating temperature of the heat pump rises from 40 degrees C to 48 degrees C. Besides, the pressure ratio of the compressor decreases from 3 to 2.5 when the ground temperatur e increases from 11 degrees C to 19 degrees C. The operating ti me of the heat pump is reduced by 5 h as the daily solar radiation incr eases. As the solar radiation increases from 1 to 20 MJ/m(2), the colle ctor heat rises by 48% and the maximum collector heat becomes 47.8 kWh. The heating load increases by 70% as the indoor design temperatur e increases from 18 degrees C to 26 degrees C. However, the sol ar fraction is reduced from 11.4% to 5.8% because of the increas es of the heating load. (C) 2012 Elsevier Ltd. All rights reserved.