Learning Forum

[jfonseca662]

Hello,nI am using a station I have in the uni to simulate the heat transfer and the efficiency of the ventilation. nSome components of the station are easily to model and have achieved good results. Other are much more complex and the results are far from great. nDue to the complexity (components size and configuration, properties, etc), I thought that considering them a block using the blackbox approach would be enough, but now that I have some results they are far from the expectations.nAny tip how I could go around this complexity? Some good practices, some guides?n

[Rob]

You need to be careful ignoring or approximating without a good understanding of what you're trying to replicate. Options are to ignore the feature entirely, replace with a solid (hot or otherwise) or replace using a source term in the air space, finally using a hot surface(s). Depending on the requirements of the simulation and the object in question I may use all of the options in the same model. n

[jfonseca662]

Hello Rob,nThanks for your help.nThat is kinda my approach until now, but I am not sure if I am being to critical about my results or if, on the contrary, I can refine the model much more. nThe simulation is steady state, and the heat generation (which I have the generic values) will increase the air temperature, that will be used to cool down other equipments which I have a detailed model and I am happy about. But the income air temperature will affect the cooling of these detailed equipments, and that's where I need to get.nSo, my approach was to design a full compact solid (with the dimensions of the actual component) to which I have assigned the value of heat generation (W). But I am not sure how thermal properties can change the value of air temperature, and how to work with them to have more robust results. What good practices should I use in this scenario? Should I just ignore the temperature that the solids reach and trust, as a steady state, that all the heat generated will be carried by the air and the temperature that gets to the detailed components will not change a lot with the temperature these unknown solids get to? Or should I try to match temperatures with some experimental data? If so, what methods should I use to calculate the thermal properties, knowing that the interior of these components is unkown?n