[Doflamingo]

Hi everyone,
I'm working on the design of a cooling system for a battery module, composed by 3 cells in parallel. As you can see in the file attached, there are some alluminum plates between the cells in order to perform the cooling. Inside those plates there are 6 channels in wich water flows at 283K. Even if I set the initial temperature of 300K on cells and plates through the patch command in the hybrid initialization, when I see on the screen the real time values from the Cell Monitors I read directly 283K as initial temperature on all the components of the assembly, as if the water was flowing inside each component. Instead, what I want to see is an initial temperature of the cells of 300K that decrease/increase based on thermal exchanges with the environment/plates. Maybe the problem is dumb and It's all about the initialization. Hope you can help me!
Thanks in advance.

[gartz89]

First of all in your case I’m not quite sure if your solidworks model is “combine” of different domein.However second if you are be “combined” your model Into your mesh you have got domeins of water and domein of solid. If this is true you have to go in your boundary conditions and if you have wall shadow, that’s mean that you already done for conjugate heat transfer between your solid domein and fluid domain. After that if you first have to initialization from wall, or inlet it doesn’t matter in your case and finally go to Patch and patch the temperature of your solid domein. The patch must be your last operation, then run and everything is going to be all right.

[Doflamingo]

Hi gartz and thanks for answer my question. Unfortunately, even if I already done all that you said, the temperature of the batteries starts cooling from 283K and not from 300K. Can the problem be releated to the use of the MSMD Dual Potential to represent the thermal behaviour of the batteries? Can be a problem of contact mesh between batteries and plates? (plates are thetraedons and batteries hexa)

[gartz89]

I don’t think so that the problem is from your mesh, the mesh is important but if you have connection between the solid if fluid and If you have all of these think that I told you:
1) Fluid domain from the water with BC;
2) Solid domein with I suppose you’ve got adiabatic walls so your heat flux is 0 W/m2;
3) In Fluent you must have in BC wall shadow or if you don’t have wall shadow in BC you must have interface between solid and fluid you will be created for coupled. However if you have all of these things that you’ve got conjugate heat transfer (CHT) between fluid and solid;
4) Your simulation is transient what is your number of time step? If you have correct time step then look your solver if is default ok no problem;
5) When I saw your geometry there is symmetry the model, but however it will be work hard with this;
6) Check all of these things, and if can't be done, could you provide one picture of your model in Fluent for more analysis.

Regards !

[vinerm]

Battery module does not have any such limitation or setting. It depends upon the initialization. Using the initialization, you can initialize whole domain at only one temperature.So, you have to use Patch for temperature in the solid zone. Do NOT use hybrid initialization for this case.