How to use the dual source heat pump suitable for the cascade recovery and utilization of waste heat in baths?

The upper part of the sewage heat pump unit is connected with the lower part of the sewage heat pump unit, and the lower part of the sewage heat pump unit is suitable for waste heat recovery. The upper part of the sewage heat pump unit is connected with the lower part of the sewage heat pump unit, and the lower part of the waste heat pump unit is suitable for waste heat recovery, The air source heat pump unit is a double folding waste gas evaporator. During the peak bath period, the air source heat pump unit and sewage source heat pump unit will be turned on at the same time to prepare hot water in the bath area. The air source heat pump unit replenishes the excess heat to the lower part of the sewage tank through refrigerant. Start the sewage source heat pump unit in the low peak period of bathing, and use the heat of wastewater to prepare bathing hot water. The system supplements the unused heat in the air source heat pump unit to the lower temperature area of the sewage pool, realizing the cascade utilization of energy.