How Much Water Can a Freezer Turn to Ice in One Hour?

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    Thermodynamics
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Homework Help Overview

The discussion revolves around calculating the volume of water that a freezer can convert into ice cubes in one hour, given specific parameters such as the coefficient of performance and power input. The subject area includes thermodynamics and heat transfer principles.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to calculate the heat removed by the freezer using the coefficient of performance and power input, but expresses uncertainty about their calculations, particularly regarding the mass of ice produced. Some participants question the value used for heat removal and the conversion between kilowatts and joules.

Discussion Status

The discussion is ongoing, with participants clarifying concepts and calculations. The original poster has identified an error in their understanding of power conversion, which has led to further exploration of the problem. No consensus has been reached yet, but there is active engagement in addressing misunderstandings.

Contextual Notes

Participants are working within the constraints of a homework problem, which may limit the information available for discussion. The original poster is also seeking guidance on how to conclude the thread, indicating a desire for closure on the topic.

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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?
 
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How do you 700J for QL ? Shouldn't it be 7J.
 
How many J/s are in 1 KW?
 
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!
 
Only Administrators can close threads, so don't worry.
 
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