Heat exchange (Batteries - Air)

marte8 · June 25, 2018, 07:08

Hi everyone

I have a problem with a heat exchange simulation. My system is simple: I have two Batteries (Heat source: 1500 W) and a mass flow inlet of air that is at ambient temperature (around 300 K).

I have set the initial condition of the temperature for the batteries of 343 K (I have to simulate the exchange in the baddest conditions) but the problem is that if I let run the simulation there is no convergence; it's like there is no Heat Source at all because the temperature decreases until it reaches the ambient condition.

Could anyone help me with this problem?

marte8 · June 25, 2018, 07:11

Here I post the images of the system.

marte8 · June 26, 2018, 09:22

Here the FILE SET-UP

https://drive.google.com/file/d/1te-...ew?usp=sharing

cwl · July 15, 2018, 23:24

You have set Heat Source at surfaces like "Assieme con fondo modificato per CHT STAR con estrusioni 2_SOLID.Battery Pack 2" - which is ignored since it is part of the Interface and thus it's values (as a boundary condition) are ignored, it's just a heat transfer interface now.

To set up internal battery heat source:
Batteries -> Physics Conditions -> Energy Source Option = Total Heat Source
Batteries -> Physics Values -> Heat Source = 3000 W

Keep in mind that you've chosen default Copper material for batteries (Solid Physics) - and you might need to adjust it to properties of your battery.

June 25, 2018, 07:08	Heat exchange (Batteries - Air)	#1
marte8 New Member VS Join Date: Jun 2018 Posts: 3 Rep Power: 7	Hi everyone I have a problem with a heat exchange simulation. My system is simple: I have two Batteries (Heat source: 1500 W) and a mass flow inlet of air that is at ambient temperature (around 300 K). I have set the initial condition of the temperature for the batteries of 343 K (I have to simulate the exchange in the baddest conditions) but the problem is that if I let run the simulation there is no convergence; it's like there is no Heat Source at all because the temperature decreases until it reaches the ambient condition. Could anyone help me with this problem?

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June 26, 2018, 09:22		#3
marte8 New Member VS Join Date: Jun 2018 Posts: 3 Rep Power: 7	Here the FILE SET-UP https://drive.google.com/file/d/1te-...ew?usp=sharing

July 15, 2018, 23:24		#4
cwl Senior Member Chaotic Water Join Date: Jul 2012 Location: Elgrin Fau Posts: 435 Rep Power: 17	You have set Heat Source at surfaces like "Assieme con fondo modificato per CHT STAR con estrusioni 2_SOLID.Battery Pack 2" - which is ignored since it is part of the Interface and thus it's values (as a boundary condition) are ignored, it's just a heat transfer interface now. To set up internal battery heat source: Batteries -> Physics Conditions -> Energy Source Option = Total Heat Source Batteries -> Physics Values -> Heat Source = 3000 W Keep in mind that you've chosen default Copper material for batteries (Solid Physics) - and you might need to adjust it to properties of your battery.