1, storage tanks of chilled water pump continuous circulation through the plate or sub-evaporator
2, after the compressor operation by suction-compression-exhaust-condensation (liquefaction)-throttling-and then in the evaporator with 10 to 18 degrees of low-temperature evaporation endothermic vaporization. Frozen water condenses into ice on the surface of a cooler evaporator at a temperature of 0 degrees. When the ice freezes to a certain thickness, When the refrigerant evaporation temperature reaches the setting temperature of temperature control, the defrosting solenoid valve is often used as the heat pump form to remove ice. To implement the next cycle.