Abstract
New heat pump water heater system using CO_2 has been developed to spread the electrical heat pump water heater from the point of view of the global warming prevention. The developed system consists of a water tank, the refrigeration circuit with a suction line heat exchanger (SLHX), a bypass line and heat recovery heat exchanger (HRHX) for the defrost. This system has three operating modes; hot water storage mode, heating up mode and defrost mode using HRHX. The SLHX can make the inlet quality of the evaporator lower than the conventional cycle without the SLHX, therefore amount of excessive refrigerant can be stored in the air side heat exchanger (evaporator) without accumulator under the various condition. In the defrost mode, the HRHX makes defrosting capacity increase and the air heat exchanger are used as the condenser.
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