TY - JOUR
T1 - Comparative heating performance evaluation of hybrid ground-source heat pumps using serial and parallel configurations with the application of ground heat exchanger
AU - Lee, Minwoo
AU - Cha, Dowon
AU - Yun, Sungho
AU - Yoon, Seok Mann
AU - Kim, Yongchan
N1 - Funding Information:
This work was jointly supported by the Energy Technology Development Program (No. 20173010140840) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Korea Government Ministry of Trade, Industry & Energy.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/2/1
Y1 - 2021/2/1
N2 - Hybrid ground-source heat pumps (HGSHPs) were introduced to prevent performance degradation under thermal imbalance between heating and cooling loads. However, the performance of an HGSHP with a parallel configuration has been rarely investigated in heating-dominated areas. In this study, the heating performances of HGSHPs with serial and parallel configurations are analyzed experimentally by varying the entering secondary fluid temperature (EFT) and flow rate of the supplementary heat exchanger as well as the ground temperature. Compared with the serial configuration, the parallel configuration demonstrates a 16.3% greater heating capacity and 12.6% higher coefficient of performance at an optimal flow rate of 10 LPM with an EFT and ground temperature of 19 °C and 14 °C, respectively. Moreover, for EFTs less than 22 °C, the parallel configuration demonstrates a reduced heat extraction rate from the ground as well as a higher exergy efficiency. Overall, the parallel configuration exhibits superior heating performance, even under severe ground thermal conditions.
AB - Hybrid ground-source heat pumps (HGSHPs) were introduced to prevent performance degradation under thermal imbalance between heating and cooling loads. However, the performance of an HGSHP with a parallel configuration has been rarely investigated in heating-dominated areas. In this study, the heating performances of HGSHPs with serial and parallel configurations are analyzed experimentally by varying the entering secondary fluid temperature (EFT) and flow rate of the supplementary heat exchanger as well as the ground temperature. Compared with the serial configuration, the parallel configuration demonstrates a 16.3% greater heating capacity and 12.6% higher coefficient of performance at an optimal flow rate of 10 LPM with an EFT and ground temperature of 19 °C and 14 °C, respectively. Moreover, for EFTs less than 22 °C, the parallel configuration demonstrates a reduced heat extraction rate from the ground as well as a higher exergy efficiency. Overall, the parallel configuration exhibits superior heating performance, even under severe ground thermal conditions.
KW - Ground thermal imbalance
KW - Heating performance
KW - Hybrid ground-source heat pump
KW - Parallel configuration
KW - Serial configuration
UR - http://www.scopus.com/inward/record.url?scp=85097683026&partnerID=8YFLogxK
U2 - 10.1016/j.enconman.2020.113743
DO - 10.1016/j.enconman.2020.113743
M3 - Article
AN - SCOPUS:85097683026
SN - 0196-8904
VL - 229
JO - Energy Conversion and Management
JF - Energy Conversion and Management
M1 - 113743
ER -
