A-LEVEL PHYSICS: 11.2.13: Coefficients of Performance (SaveMyExams) Flashcards
1
Q
the efficiency of a reversed heat engine depends on its…
A
purpose
2
Q
why is COP used to measure the effectiveness of a reversed heat engine instead of efficiency ?
A
bc the efficiency of a reversed heat engine depends on its purpose
3
Q
COP is not a measure of efficiency. why ?
A
bc it can be greater than 1
4
Q
COP:
A
measure of how effective a reversed heat engine is at transferring heat per unit of work done
5
Q
COP refrigerator = …
A
COPref. = QC/W
= QC / (QH-QC)
= TC / (TH-TC)
6
Q
COP heat pump = …
A
COPhp. = QH / W
= QH / (QH-QC)
= TH / (TH-TC)
7
Q
QH = ___ + ___
A
QH = QC + W
8
Q
WCOPhp. = …
A
WCOPhp. = WCOPref. + W
COPhp. = COPref. + 1
