35. A heat pump does work W to bring heat QL from the cold outside (at constant temperature TL) and deliver heat QH to warm the interior at constant temperature TH. Which of the following is wrong?
(A) The coefficient of performance COP =
(B) W= QH-QL
(C) COP ＜1.0
(D) Ideally COP =
(E) QH ＞QL 

答案：登入後查看
統計： A(0), B(0), C(8), D(0), E(2) #2993334

詳解 (共 1 筆)

#7295220
複習
QH = QC + W (always)
熱機 Heat Engine (目的：作功)  e =W/ QH = (QH - QC)/ QH =(TH - TC)/ QH
冷機 air conditioner (目的：保持低溫端冷) COP= QC /W = QC/ (QH - QC)=TC/ (TH - TC)
heat pump (目的：保持高溫端熱) COP= QH /W = QH /(QH - QC)= TH /(TH - TC)
COP通常都大於1，少數可能發生小於1的情況為功率非常差的冷機，當W>QC 時
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