Sewage source heat pump principle is the use of sewage treatment plant effluent, water quality and stability, perennial temperature of 13 to 25 degrees Celsius and other characteristics of sewage as a heat source for cooling, heating cycle of an air-conditioning unit. Sewage source heat pump technology and economy and the characteristics of sewage heat are closely related. For heat pump systems, the ideal sewage heat should have the following characteristics: In the heating season has a high and stable temperature, can be obtained in large quantities, non-corrosive or polluting, ideal thermodynamic properties, investment and operating costs than low. In most cases, the nature of the thermal energy of the sewage is the key to its use. Sewage source heat pump uses sewage as the heat source of the water source heat pump. It has the following characteristics: large amount of output and constant flow rate over the year; temperature in summer is lower than outdoor temperature, temperature in winter is higher than outdoor temperature, and in the whole heating season and cooling season , Water temperature fluctuations; contains a lot of heat, it is estimated that 40% of waste heat generated by urban communities in the sewage. Therefore, the use of sewage and heat pump to provide an ideal heat source for district heating and cooling. Sewage source heat pump system Its heating system and the principle of ordinary water source heat pump the same, mainly by the compressor, condenser, evaporator and throttling constitute a simple steam compression heat pump unit as a heating system heat source. It draws heat Qe from the waste water through the evaporator and releases heat Qc (Qc = Qe + W) to the heating system in the condenser. As long as this heating system consumes a small amount of electric energy W, the amount of heat required for heating the room Qc can be obtained. Sewage source heat pump system can be divided into sewage source heat pump system with untreated sewage as heat source and sewage source heat pump system with secondary effluent or middle water as heat source according to the treatment status of the sewage which is used. According to the heat of sewage and heat pump Exchange part of the direct exchange of heat, can be divided into indirect use of the system and direct use of the system; conversion from the working conditions point of view, can be divided into two types: one is through the four-way reversing valve to achieve the heating Condition and cooling conditions of the conversion; the other is the water switch, that is, through the valve to change the flow direction to achieve the conversion.
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