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- [6] Thermodynamic analysis on performance of direct expansion solar assisted heat pump water heater Huagong Xuebao, 2006, SUPPL. (110-115):
- [7] Effect of refrigerant charge on the performance of a direct expansion solar assisted heat pump water heater Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University, 2010, 44 (10): : 1372 - 1377