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 |
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Pages (from-to) | 337-345 |
Number of pages | 9 |
Journal | Energy |
Volume | 154 |
DOIs | |
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