Temperature Limit for Cooling System

huangyuan18 · November 7, 2016, 12:13

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

W!ldejon · December 21, 2016, 07:57

Are you simply using a resistance with a negative heat gen? Or the Heat Exchanger material?

huangyuan18 · December 21, 2016, 11:15

Quote:

Originally Posted by W!ldejon

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.

W!ldejon · December 29, 2016, 04:18

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.

November 7, 2016, 12:13	Temperature Limit for Cooling System	#1
huangyuan18 New Member Ryan Huang Join Date: Nov 2016 Posts: 3 Rep Power: 10	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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December 21, 2016, 07:57		#2
W!ldejon New Member Jon Wilde Join Date: Dec 2016 Posts: 25 Rep Power: 10	Are you simply using a resistance with a negative heat gen? Or the Heat Exchanger material?

December 29, 2016, 04:18		#4
W!ldejon New Member Jon Wilde Join Date: Dec 2016 Posts: 25 Rep Power: 10	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.