Performance evaluation of a gas injection CO2 heat pump according to operating parameters in extreme heating and cooling conditions

Hyun Joon Chung; Changhyun Baek; Hoon Kang; Dongwoo Kim; Yongchan Kim

doi:10.1016/j.energy.2018.04.132

Performance evaluation of a gas injection CO₂ heat pump according to operating parameters in extreme heating and cooling conditions

Hyun Joon Chung, Changhyun Baek, Hoon Kang, Dongwoo Kim, Yongchan Kim

School of Mechanical Engineering

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

15 Citations (Scopus)

Abstract

The objective of this study is to optimize the performance of a gas injection CO₂ heat pump according to the operating parameters in extreme heating and cooling conditions. The performances of CO₂ heat pumps using a flash tank gas injection (FTGI) in the heating mode and FTGI with the suction line heat exchanger (FTSX) in the cooling mode are measured with the variations of the injection ratio, compressor frequency, and evaporating pressure in the extreme outdoor conditions. At the compressor frequency of 45 Hz, the cooling COP of the gas injection CO₂ heat pump with the optimum injection ratio is 6.8% higher than that of the non-injection CO₂ heat pump at the indoor/outdoor temperatures of 17/43 °C. Moreover, the heating COP of the gas injection CO₂ heat pump is 7.1% higher than that of the non-injection system at the indoor/outdoor temperatures of 20/–15 °C.

Original language	English
Pages (from-to)	337-345
Number of pages	9
Journal	Energy
Volume	154
DOIs	https://doi.org/10.1016/j.energy.2018.04.132
Publication status	Published - 2018 Jul 1

Bibliographical note

Funding Information:
This work was jointly supported by the Energy Technology Development Program (No. 20142010102660) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Industrial Core Technology Development Program (No. 10049090) of the Korea Evaluation Institute of Industrial Technology (KEIT) funded by the Korea Government Ministry of Trade, Industry and Energy.

Funding Information:
This work was jointly supported by the Energy Technology Development Program (No. 20142010102660 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Industrial Core Technology Development Program (No. 10049090 ) of the Korea Evaluation Institute of Industrial Technology (KEIT) funded by the Korea Government Ministry of Trade, Industry and Energy .

Publisher Copyright:
© 2018 Elsevier Ltd

Keywords

CO heat pump
Compressor frequency
Evaporating pressure
Gas injection
Injection ratio
Two-stage

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Pollution
Mechanical Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

Access to Document

10.1016/j.energy.2018.04.132

Cite this

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title = "Performance evaluation of a gas injection CO2 heat pump according to operating parameters in extreme heating and cooling conditions",

abstract = "The objective of this study is to optimize the performance of a gas injection CO2 heat pump according to the operating parameters in extreme heating and cooling conditions. The performances of CO2 heat pumps using a flash tank gas injection (FTGI) in the heating mode and FTGI with the suction line heat exchanger (FTSX) in the cooling mode are measured with the variations of the injection ratio, compressor frequency, and evaporating pressure in the extreme outdoor conditions. At the compressor frequency of 45 Hz, the cooling COP of the gas injection CO2 heat pump with the optimum injection ratio is 6.8% higher than that of the non-injection CO2 heat pump at the indoor/outdoor temperatures of 17/43 °C. Moreover, the heating COP of the gas injection CO2 heat pump is 7.1% higher than that of the non-injection system at the indoor/outdoor temperatures of 20/–15 °C.",

keywords = "CO heat pump, Compressor frequency, Evaporating pressure, Gas injection, Injection ratio, Two-stage",

author = "Chung, {Hyun Joon} and Changhyun Baek and Hoon Kang and Dongwoo Kim and Yongchan Kim",

note = "Funding Information: This work was jointly supported by the Energy Technology Development Program (No. 20142010102660) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Industrial Core Technology Development Program (No. 10049090) of the Korea Evaluation Institute of Industrial Technology (KEIT) funded by the Korea Government Ministry of Trade, Industry and Energy. Funding Information: This work was jointly supported by the Energy Technology Development Program (No. 20142010102660 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Industrial Core Technology Development Program (No. 10049090 ) of the Korea Evaluation Institute of Industrial Technology (KEIT) funded by the Korea Government Ministry of Trade, Industry and Energy . Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

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AU - Chung, Hyun Joon

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AU - Kim, Yongchan

N1 - Funding Information: This work was jointly supported by the Energy Technology Development Program (No. 20142010102660) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Industrial Core Technology Development Program (No. 10049090) of the Korea Evaluation Institute of Industrial Technology (KEIT) funded by the Korea Government Ministry of Trade, Industry and Energy. Funding Information: This work was jointly supported by the Energy Technology Development Program (No. 20142010102660 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Industrial Core Technology Development Program (No. 10049090 ) of the Korea Evaluation Institute of Industrial Technology (KEIT) funded by the Korea Government Ministry of Trade, Industry and Energy . Publisher Copyright: © 2018 Elsevier Ltd

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N2 - The objective of this study is to optimize the performance of a gas injection CO2 heat pump according to the operating parameters in extreme heating and cooling conditions. The performances of CO2 heat pumps using a flash tank gas injection (FTGI) in the heating mode and FTGI with the suction line heat exchanger (FTSX) in the cooling mode are measured with the variations of the injection ratio, compressor frequency, and evaporating pressure in the extreme outdoor conditions. At the compressor frequency of 45 Hz, the cooling COP of the gas injection CO2 heat pump with the optimum injection ratio is 6.8% higher than that of the non-injection CO2 heat pump at the indoor/outdoor temperatures of 17/43 °C. Moreover, the heating COP of the gas injection CO2 heat pump is 7.1% higher than that of the non-injection system at the indoor/outdoor temperatures of 20/–15 °C.

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