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Study of New Mini-Channel Trans-Critical CO 2 Heat Pump Gas Cooler.
- Source :
- Micromachines; Aug2022, Vol. 13 Issue 8, p1206-1206, 18p
- Publication Year :
- 2022
-
Abstract
- A gas cooler is one of the important parts of a carbon dioxide (CO<subscript>2</subscript>) heat pump water heater, and it must meet the needs of not only pressurization but also heat transfer. It is important to study gas coolers. In this paper, a heat exchanger with a spiral channel is studied. ANSYS CFX software was used to analyze the flow and heat transfer characteristics of the heat exchanger (single-plate model). The influences of the cooling pressure of CO<subscript>2</subscript>, the mass flux of CO<subscript>2</subscript>, the mass flux of water and the channel radius of CO<subscript>2</subscript> are discussed. In this paper, the results show that the cooling pressure of CO<subscript>2</subscript>, the mass flux of CO<subscript>2</subscript> and the channel radius of CO<subscript>2</subscript> all have a large influence on the local heat transfer coefficient: with an increase in the cooling pressure of CO<subscript>2</subscript>, the peak value of the heat transfer coefficient of CO<subscript>2</subscript> decreases and the average heat transfer coefficient decreases; with an increase in the mass flux of CO<subscript>2</subscript>, the peak value of the heat transfer coefficient of CO<subscript>2</subscript> increases and the average heat transfer coefficient increases; and with a decrease in the channel radius of CO<subscript>2</subscript>, the peak value of the heat transfer coefficient of CO<subscript>2</subscript> increases. The water mass flux has only a slight effect on heat transfer, and the lower cooling pressure of CO<subscript>2</subscript> corresponds to a higher peak heat transfer coefficient, which can reach 27.5 kW∙m<superscript>−2</superscript>∙K<superscript>−1</superscript> at 9 MPa. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 2072666X
- Volume :
- 13
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Micromachines
- Publication Type :
- Academic Journal
- Accession number :
- 158911832
- Full Text :
- https://doi.org/10.3390/mi13081206