# Thermodynamics freezer problem

1. Nov 12, 2013

### soccer4life

1. What volume of water at 0oC can a freezer make into ice cubes in 1.0 hour, if the coefficient of performance of the cooling unit is 7.0 and the power input is 1.0 kilowatt?

2. C.O.P.=QL/W
Q=mlfusion
$\rho$=m/v

3. I found QL by using the above formula, which gave me 700J. Next I used Q=ml (l=333000j/kg) to find the mass which is where I got .002 kg (I'm pretty sure that this is where I made my mistake.) Next I know to use the formula for density to divide the mass by the density of water (1 x 103. Can somebody point out where I made a mistake, or if my thinking is wrong?

Last edited: Nov 12, 2013
2. Nov 12, 2013

### Mentz114

How do you 700J for QL ? Shouldn't it be 7J.

3. Nov 12, 2013

### SteamKing

Staff Emeritus
How many J/s are in 1 KW?

4. Nov 12, 2013

### soccer4life

Sorry, I figured out the problem (1000J/s in 1 KW instead of 100...,) but don't know how to close the thread (if possible.) Thanks for the responses though!

5. Nov 13, 2013

### SteamKing

Staff Emeritus