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BASIC HEAT PUMP THEORY By: Lloyd A. Mullen By: Lloyd G. Williams Service Department, York Division, Borg-Warner Corporation Figure 26F10A This superheat will be removed in condenser so the next assumption would be that temperature out of condenser would be about 125°F with no subcooling. Since some subcooling is also provided in condenser, temperature of 110°F could be assumed. Liquid pressure is still 288 lbs. less any pressure drop in condenser and liquid line. At expansion device, pressure drops to 72 lbs. Evaporator temperature will be 42°F because of addition of superheat, suction temperature at compressor will be 58°F. Suction pressure will be 72 lbs. less any pressure drop in suction line. Air on evaporator was assumed to have a temperature of 80°F. Air off evaporator should then have a temperature of approximately 60°F. Air temperature off condenser should be 115°F. These figures are approximaate but, if unit is operating properly, they are indicative of pressures and temperatures expected. Heating Cycle Performance Figure 26F10B illustrates the same procedure on heating cycle, assuming outdoor temperature of 45°F dry bulb and 40°F wet bulb with room temperature of 70°F dry bulb. These conditions when plotted show a head pressure of 255 lbs. and a suction pressure of 47 lbs. Service Application Manual SAM Chapter 620-54 Section 18 23PDF Image | BASIC HEAT PUMP THEORY INTRO
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