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Heat Pumps for Heating and Cooling water coil. The indoor air is cooled via passing air across the chilled water cooling coil comprised of copper tubes bonded to aluminum fins. 5.4. Receiver The condensed liquid refrigerant from the condenser is stored in a vessel known as the receiver from where it is supplied to the evaporator through the expansion valve or refrigerant control valve. 5.5. Expansion Device Like the compressor, the expansion device is a system component that acts as a dividing point between the high and low pressure sides of the heat pump system. The expansion device acts as a blockage in the refrigerant circuit and restricts flow as the refrigerant flows between the two heat transfer coils. The temperature and pressure of the refrigerant at the inlet of the expansion device is high, while the temperature and pressure of the refrigerant at the outlet of the expansion device is low. A variety of expansion devices may be used in heat pumps. A very basic expansion device is a capillary tube. A capillary tube is a long, thin tube that is a specific diameter and length to generate a specific pressure. There are no mechanical parts; therefore, the refrigerant can flow through it in both directions. Modern units use expansion valves (TXV) to regulate the pressure of system. It allows the liquid refrigerant under high pressure and temperature to pass at a controlled rate. The operation of a thermostatic expansion valve is governed by the temperature of the refrigerant. When the temperature rises, the temperature sensor causes the expansion valve to open up more allowing for a more rapid flow of refrigerant. The temperature sensor is mechanically connected to the valve. While they are more efficient, they generally only work when the refrigerant flows in one direction unless they are specifically designed for heat pumps. Many expansion valves have the added capability of metering the quantity of refrigerant flowing through the cycle in order to match the load to enhance the efficiency of the cycle. 5.6. Reversing Valve The reversing valve is controlled by a solenoid coil that, when energized, causes the valve to change positions. The reversing valve has four ports: • One port connected to the outlet of the compressor • One port connected to the inlet of the compressor 69PDF Image | Heat Pumps for Heating and Cooling
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