
Re: Liquid Cold Plates Thermal Simulation
Bill McEachern Aug 4, 2017 6:59 PM (in response to Swme Eng)sure if you can estimate the convection coefficient with that data. It can be done but the calc is a bit more involved.

Re: Liquid Cold Plates Thermal Simulation
Swme Eng Aug 4, 2017 7:25 PM (in response to Bill McEachern)Bill, can you assume that the temperature set point of the chiller is the bulk fluid temperature for pulling dynamic viscosity, thermal conductivity, and density?
Correct me if I'm wrong but I think the analysis goes something like this:
Compute Reynolds number
If flow is turbulent use DittusBoetler equation to compute Nusselt number
If flow is laminar use Nusselt = 4.36
Compute convection coefficient from Nusselt number

Re: Liquid Cold Plates Thermal Simulation
Bill McEachern Aug 6, 2017 12:00 PM (in response to Swme Eng)There typically is not a lot of temp change in the working fluid of a cold plate so you are unlikely to miss by much on the delta T with the assumption you mention. If you know the inlet and outlet temps of the fluid then I would use the average. If you know the thermal dissipation, assume it is all coming out the fluid, you know the flow rate and fluid properties then you can estimate the delta T of the cold plate fluid. While it has been awhile on the convection coefficient calc what you wrote sounds about right.

Re: Liquid Cold Plates Thermal Simulation
Swme Eng Aug 7, 2017 11:09 AM (in response to Bill McEachern)Thanks Bill!


