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| Performance Analysis of Three Different Refrigerants in a Directexpansion Solar-Assisted Heat Pump Water Heater |
| KONG Xiangqiang,LI Junxiao,LI Ying
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| (College of Mechanical and Electronic Engineering, Shandong University of Science and Technology,
Qingdao 266590, Shandong, China) |
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Abstract Abstract： In order to study the performance of R22, R410A and R290 in a directexpansion solarassisted heat pump water heater (DXSAHPWH) system, the distributed parameter and homogeneous flow models of solar collector/evaporator and condenser were established, and the lumped parameter models of compressor and expansion valve and the working fluid charge model were built. Besides, a simulation program of a DXSAHPWH system was coded. The comparison indicates that the simulation results are in good agreement with the reported experimental results. The coefficient of performance(COP), collector efficiency and heat power of the DXSAHPWH using R22, R410A and R290 were compared and analyzed at different environmental parameters and operating parameters. The results show that the COP of the R290 system is apparently higher than that of the R22 and R410A system in the DXSAHPWH. The collector efficiency and heat power of the R410A system are slightly higher than those of the R22 and R290 system. In comparison with the R22 and R401A system, the environmental parameter has a greater influence on the R290 system. The variation of compressor speed remarkably affects the R410A system, and the variation of water temperature has a great impact on the R290 system. In addition, the optimum refrigerant charge of the R290 system is 46% of that of the R22 system, and the optimum refrigerant charge of the R410A system is 95% of that of the R22 system.
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Received: 09 April 2015
Published: 28 April 2016
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