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| Analysis and Evaluation of Heat Pipe Heat Exchanger's Performance with Low Global Warming Potential Refrigerant |
| ZHANG Shi-jie1,LI Zhun1,ZHOU Feng2,SUN Shu-fang2,MA Guo-yuan2 |
1. National Institute of Metrology, Beijing 100029, China
2. Beijing University of Technology, Beijing 100124, China |
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Abstract Due to alternative refrigerants requirement a heat pipe heat exchanger was developed charged with refrigerant R32, which owns low global warming potential. Experimental study and evaluations had been done in the standard psychrometric laboratory upon heat pipe heat exchanger charged with R32 under different working conditions according to its thermodynamic characteristics. For performance evaluation the energy, energy efficiency and exergy were adopted in both quantity and grade basing on the first and second law of thermodynamics. The results indicate that refrigerant R32 shows better performance for winter conditions compared to summer conditions, especially in temperature effectiveness, heat transfer rate, energy efficiency ratio, dimensionless entropy generation rate and exergy loss merit. Compared to parallel heat exchangers, the temperature effectiveness of inclined heat exchanger increases by 11.7 to 12.9% averagely with 5 degree inclination angle, and energy efficiency ratio (EER) rises by 0.6 to 3. The dimensionless entropy generation rate decreases by 0.012 in summer and 0.0024 in winter when the indoor and outdoor temperature difference increases by 1 degree for parallel heat exchanger. For inclined heat exchanger, the exergy loss rate merit increases by 0.0159 in summer and 0.0015 in winter for one degree.
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Received: 16 October 2020
Published: 23 March 2021
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2020, Vol. 41 
