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Heat Pumps for Heating and Cooling A general expression for the efficiency of a heat engine can be written as: Using the same logic that was used for heat engines, this expression becomes: Where, Q hot = Heat input at high temperature and Q cold = Heat rejected at low temperature. The expression can be rewritten as: Note: Thot and Tcold must be expressed in the Kelvin scale. Example 1 Calculate the ideal coefficient of performance (COP) for an air-to-air heat pump used to maintain the temperature of a house at 70°F when the outside temperature is 30°F. Solution: First, convert the Fahrenheit temperatures to Celsius temperatures using this formula: Thot =(70−32)×5/9=21°C Tcold =(30−32)×5/9=−1°C Next, convert the Celsius temperatures to Kelvin temperatures by adding 273. T hot = 21°C + 273 = 294K T cold = −1°C+273=272K Finally, use the formula from the previous screen to solve for the COP. COP= 294K / (294K−272K) = 294 / 22 =13.3 23PDF Image | Heat Pumps for Heating and Cooling
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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