2 direction heat transfer
2 direction heat transfer
(OP)
hi, I have a metal heater which is contact with water and air (Metal heater is kind of plate). The metal heater energy supplied from external heat source or it is connected with power supply to produce resistance.
In that case, how I calculate total heat transfer? I am confused because heater will supplied to right and left.
In that case, how I calculate total heat transfer? I am confused because heater will supplied to right and left.





RE: 2 direction heat transfer
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RE: 2 direction heat transfer
If the temperature of the plate block is < 27C then you've got heat transfer from the air to the plate to the water complicating life.
It's likely that the heat transfer to the water far exceeds that to the air to the extent you might just allow for it by a few percent additional heat transfer.
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RE: 2 direction heat transfer
Thank you for your responds and sorry for unclear message.
So, I want to use a metal heater (I want to set the heater constant which is 70oC) to heat water in a closed system. However, this closed system consists of still / stagnant water, metal heater, and air.
Due to the purpose of a metal heater is to heat the still water. So I there will be a heat loss in air part.
Because of that, I want to calculate heat loss and supply energy needed of the metal heater (It will be supplied from electricity).
However, so far I know the heat transfer calculation has gradually temperature gradient.
Thank you
RE: 2 direction heat transfer
Thank you
RE: 2 direction heat transfer
How much water? How fast?
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RE: 2 direction heat transfer
Water volume: 6 cm3
It is stagnant water, so there will be no circulation speed.
RE: 2 direction heat transfer
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homework forum: //www.engineering.com/AskForum/aff/32.aspx
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: 2 direction heat transfer
You have tow surfaces with a surface temp of 70C. Just calculate the heat loss into the water and into air.
Your possible issue is that the water will gradually heat up if it's a closed system so you have a transient analysis going on there.
Why not insulate the air side?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.