Heat Pumps and Air Conditioning Basic Theory

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Heat Pumps and Air Conditioning Basic Theory ( heat-pumps-and-air-conditioning-basic-theory )

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• Suppose we want to transfer heat from inside (25 C) to outside (38C) TH • Carnot engine efficiency= W/QH=1‐TL/TH=1‐ (25+273.15)/(38+273.15)= 0.042 QH EW • A/C (cooling) COP QL/W= (1‐.042)/(.02)=22.9 Alternative expression, same result: COP= TL/(TH‐TL) QL • But to drive, the heat transfer, to/from the air, we might need a 10C differential, TL TH=48C, TL=15CCOP=8.7 Carnot A/C

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