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http://dx.doi.org/10.17664/ksgee.2021.17.2.030

Heating Performance of Heat Pump System Using Dual Heat Source and Its Operation Characteristics  

Lim, Hyojae (Geothermal Energy Education Center, Hoseo University)
Sohn, Byonghu (Korea Institute of Civil Engineering and Building Technology(KICT))
Publication Information
Journal of the Korean Society for Geothermal and Hydrothermal Energy / v.17, no.2, 2021 , pp. 30-41 More about this Journal
Abstract
This paper presents the heating performance analysis results of a heat pump system using a dual heat source. In this paper, a dual heat source refers to the ground-coupled heat exchanger using both a surface water heat exchanger (SWHE) and a vertical ground heat exchanger (VGHE). In order to evaluate the system performance, we installed a monitoring system to measure the temperature and power consumption of a heat pump and then collected operation data with 4 different load burdened ratios of the dual heat source heat exchanger. During the whole measurement period, the average heating capacity of a water-to-water heat pump unit was 37.3 kW. In addition, the compressor of the heat pump consumed 9.4 kW of power, while the circulating pump of the dual heat source heat exchanger used 6.7 kW of power. Therefore the average heating coefficient of performance (COP) for the heat pump unit was 4.0, while the entire system including the circulating pump was 2.7. Finally, the parallel use of SWHE and VGHE was beneficial to the system performance; however, further researches are needed to optimize the design data for various load ratios of the dual heat source heat exchanger.
Keywords
Dual heat source; Heat pump; Heating performance; Operation characteristic; Surface water heat exchanger; Vertical ground heat exchanger;
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