water source heat pump semi-closed twin-screw compressor shell and tube heat exchanger Danfoss/Emerson and Siemens system 1.Type: ... radiator ,fancoil etc.for refrigeration ,heating ,supplying sanitany water.2.Environment-friendly Using non-polluting refrigerant,when operating can ... Economicalone system can realise the heating ,cooling and supplying water,the investment and operating cost is only 1/2to ...