Heat transfer for a cold water dispensor.

[kgmilano]

good afternoon


i have a project to build a water dispenser. I'm strugling with heat transfer equations since it's cold that is being transfered. do i use the standard heat transfer equations even for cold? which equations do i use. water will be inside a 100x100x150 (1.5 litres) casing made out of aluminium.

thanks

 

[Mech_Engineer]

Any heat transfer problem comes down to the transfer of heat. "Cold" is not a physical manifestation in heat transfer; there is only the absence of heat.

So yes, you use all the same equations.

 

[kgmilano]

thank you for the help. it's highly appreciated. I'm able to calculate the amount of heat to be exracted in order to decrease water from 25 deg to 0 deg and the time it takes. but i don't know how to calculate the time with the aluminuim as the container.

 

[Mech_Engineer]

You'll have to calculate the thermal resistance of your aluminum container, and then set up a thermal-equivalent electrical circuit to solve the transient problem.