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

Minwoo Lee; Dowon Cha; Sungho Yun; Seok Mann Yoon; Yongchan Kim

doi:10.1016/j.enconman.2020.113743

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

Minwoo Lee
, Dowon Cha
, Sungho Yun
, Seok Mann Yoon
, Yongchan Kim^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

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.

Original language	English
Article number	113743
Journal	Energy Conversion and Management
Volume	229
DOIs	https://doi.org/10.1016/j.enconman.2020.113743
Publication status	Published - 2021 Feb 1

Bibliographical note

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Ground thermal imbalance
Heating performance
Hybrid ground-source heat pump
Parallel configuration
Serial configuration

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Nuclear Energy and Engineering
Fuel Technology
Energy Engineering and Power Technology

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10.1016/j.enconman.2020.113743

Cite this

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

abstract = "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.",

keywords = "Ground thermal imbalance, Heating performance, Hybrid ground-source heat pump, Parallel configuration, Serial configuration",

author = "Minwoo Lee and Dowon Cha and Sungho Yun and Yoon, \{Seok Mann\} and Yongchan Kim",

note = "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: {\textcopyright} 2020 Elsevier Ltd",

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doi = "10.1016/j.enconman.2020.113743",

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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

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VL - 229

JO - Energy Conversion and Management

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ER -

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

Abstract

Bibliographical note

UN SDGs

Keywords

ASJC Scopus subject areas

Access to Document

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