The principle of solar energy and gas heat pump is shownin figure 1.The water completed heat exchange with the water to water heat exchanger firstly flowinto the condenser to absorbing heat. Then, the outlet water of condenser flow into the cylinder cooler for heat exchanging, and the outlet water of cylinder cooler flow into the exhaust heat recovery device for heat exchanging. Lastly, the circulating water flow in the water-water heat exchange, transferring the heat to heat users. At the sametime, the system connects with the city heating network,which can ensuring heating demand in extreme cold weather. The heat storage tank can ensure the temperature of water flowing into evaporator changes between 10-30ć.So the system can guarantee the stability and reliability of heating [3].
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