# COP refrigerator vs COP Heat Pump

## Homework Statement

I just want to know when do I use the formula for COP refrigerator vs COP Heat pump. If the heat is absorbing something then what formula do I use

## Homework Equations

3. The Attempt at a Solution [/b}
Uh I just trying 2 figure out the concept so Idk how 2 solve it lol

Andrew Mason
Homework Helper

## Homework Statement

I just want to know when do I use the formula for COP refrigerator vs COP Heat pump. If the heat is absorbing something then what formula do I use
If you think of COP as: output/input you will avoid confusion. If it is a heat pump, the output is the heat flow to the hot reservoir. If it is a refrigerator the output is the heat flow from the cold reservoir. The input is the work done.

So, for a refrigerator: COP = output/input = Qc/W

and for a heat pump: COP = output/input = Qh/W = (Qc + W)/W = Qc/W + 1

AM