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Temperature Limit for Cooling System

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Old   November 7, 2016, 12:13
Question Temperature Limit for Cooling System
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Ryan Huang
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I am currently running a simulation with a chilling coil in an inlet cooling system. I simplified the chilling coil as a combination of heat generator(negative value) and resistance.
Problem arises at low speed areas where the air can be as low as -30 degrees. This is certainly not the case in real life.
I wonder if anyone has experience setting temperature limit in the heat exchange simulation? or are there any other models that suit my case better?

Really appreciate the help!

Ryan
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Old   December 21, 2016, 07:57
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Jon Wilde
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Are you simply using a resistance with a negative heat gen? Or the Heat Exchanger material?
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Old   December 21, 2016, 11:15
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Ryan Huang
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Quote:
Originally Posted by W!ldejon View Post
Are you simply using a resistance with a negative heat gen? Or the Heat Exchanger material?
Thanks for your response. I was using a resistance with a negative heat gen. As far as I know heat exchanger is mostly used as external heat source, but in my case it is internal.
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Old   December 29, 2016, 04:18
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Yes, the are really designed to be used externally. If you use them internally, you need to use a flag to be sure that the inlet and outlet flow rates are consistent with one another.
Check this out: Heat Exchanger Mass Balance

I tend to just use a resistance but it depends on the goal.
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cooling rate, heat exchanger, heat generation rate

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