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Heat Pumps for Heating and Cooling • One port connected to one side of the indoor coil • One port connected to one side of the outdoor coil The reversing valve has an internal slide that ultimately determines the mode in which the system will operate. When the system is operating in the cooling mode, the refrigerant always flows to the condenser first upon exiting the compressor. When the system operates in the heating mode, the indoor coils acts as the condenser. In this case, the hot gas from the compressor is directed to the indoor coil, which functions as the condenser. The reversing valve is typically located at the compressor outlet (discharge). If the system is a split-type system, this location is within the outdoor portion of the system. Do all heat pump systems have reversing valves? No. Heat pumps that are intended to provide both heating and cooling are equipped with reversing valves. However, heat pump systems that are intended to provide only heating are not equipped with reversing valves. Solenoid A solenoid is basically a coil of wire. When electric voltage is applied to the coil and current flows through it, a magnetic field is generated. This magnetic field causes the reversing valve to change position. When the solenoid is energized, the system will work in one mode, and in the other mode when the solenoid is de-energized. Depending on the manufacturer of the heat pump equipment, the system mode associated with the energized or de-energized solenoid coil varies will vary. 5.7. Refrigerants A refrigerant is a chemical substance that has the ability to absorb and reject large amounts of heat energy quickly. By controlling the pressure of the refrigerant at different points in the system, we can determine whether a particular heat transfer surface will operate as the condenser or as the evaporator. In a heat pump system, refrigerant can be present in any one of three states: 100% liquid, 100% vapor or a mixture of liquid and vapor. When the refrigerant is a mixture of liquid and vapor, the refrigerant is said to be saturated. Each refrigerant has its own pressure/temperature relationship. Here a few of the desirable properties for a refrigerant: 70PDF Image | Heat Pumps for Heating and Cooling
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