Question

COP of reversible heat pump is 1.25. If it is reversed to run as reversible heat engine, then its efficiency is

options:
a) 0.25
b) 1.25
c) 0.626
d) 0.8​

Answer 1

Explanation:

I don't know but I'm pretty sure the answers is c?

Answer 2

Answer:

The efficiency of heat engine is 0.8 i.e.option(d).

Explanation:

The COP of the reversible heat pump is given as,

$COP=\frac{1}{\eta}$        (1)

Where,

COP=coefficient of performance of heat pump

η=efficiency of Carnot engine

From the question we have,

COP=1.25

By substituting the value of COP in equation (1) we get;

$1.25=\frac{1}{\eta}$

$\eta=\frac{1}{1.25}$

$\eta=0.8$

Hence, the efficiency of heat engine is 0.8 i.e.option(d).

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