A new type of double-flow accumulator was developed,which can automatically adjust the amount of circulating refrigerant on the system of multi-functional air-conditioning / hot-water heater so that the system was more stable and efficient under multi-working modes. Based on the principle of maximum COP,the optimal refrigerant charge of the variable refrigerant flow rate system was determined by experiment for the modes of refrigeration only and both refrigeration and hot water in the summer. The tested res...
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