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Heat Pumps for Heating and Cooling The reversing valve has four ports (A, B, C, and D): • One port connected to the outlet of the compressor • One port connected to the inlet of the compressor • 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. 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. Let’s check its functionality and working principle. 1.5. Operation of a Heat Pump in Cooling Mode The heat pump in cooling mode operates as a conventional air-conditioner with the indoor coil as an evaporator and the outdoor coil as a condenser. The refrigerant (upon leaving the compressor via the red line in the figure below) first flows through the reversing valve where it is directed to the outdoor coil. Since the refrigerant always flows to the condenser first after leaving the compressor, the outdoor coil is acting as the condenser. In this mode of operation, the heat from the refrigerant is rejected to the outside air. From the outdoor coil, the refrigerant flows through the expansion device and then to the indoor coil, where the refrigerant picks up or absorbs heat from the air in the area being cooled. The refrigerant then flows back to the compressor via the reversing valve and the cycle repeats itself. 9PDF Image | Heat Pumps for Heating and Cooling
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