Comparative heating performance evaluation of hybrid ground-source heat pumps using serial and parallel configurations with the application of ground heat exchanger

•Hybrid ground-source heat pumps with serial and parallel layouts are investigated.•Parallel configurations exhibit 16.3% greater heating capacity and 12.6% higher COP.•The serial configuration enhances the ground thermal condition more effectively.•The parallel configuration is preferred operation...

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Bibliographic Details
Published in:Energy conversion and management 2021-02, Vol.229, p.113743, Article 113743
Main Authors: Lee, Minwoo, Cha, Dowon, Yun, Sungho, Yoon, Seok-Mann, Kim, Yongchan
Format: Article
Language:English
Subjects:
Configuration management
Cooling loads
Cooling systems
Exergy
Flow rates
Flow velocity
Fluid flow
Ground thermal imbalance
Heat exchangers
Heat pumps
Heat treatment
Heating
Heating performance
Hybrid ground-source heat pump
Parallel configuration
Performance degradation
Performance evaluation
Serial configuration
Temperature
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Summary:•Hybrid ground-source heat pumps with serial and parallel layouts are investigated.•Parallel configurations exhibit 16.3% greater heating capacity and 12.6% higher COP.•The serial configuration enhances the ground thermal condition more effectively.•The parallel configuration is preferred operation mode in heating-dominated areas. 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.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2020.113743