Pro/Forums - View Single Post - can we agree on the basis of "C" in C/W ?

bobo5195 · 10-22-2005, 06:53 PM

I thought we were talking about waterblocks only, not radiators as they are complex.

My heat transfer notes say that basically C/W for rads is a bit simplistic. It suggests LM with a correction factor to take into account cooling effects inside the exchanger. In other words horrible stuff for consumers and all 4 temps (air, water, in and out) need to be known for you to even get started and they are all a complicated function of each other. As for simplifying assumptions that’s far to much down the road for it to be helpful, in short for rads I don’t think there is a nice way without knocking off a lot of factors so stuff like weather or not your using the inlet or outlet temp is neither hear nor there.

My personal opinion is that things like this consumers shouldn’t need to worry to much about. An expansion of LHG approximator with a few good results (and Newton based method for solving the matrix equations) and let the masses choose and play around hidden from the maths beneath, intergrate it into your webpage shopping cart and everyone’s happy. Some non dimensional numbers would be useful as well as a benchmark but getting a company to dosh these out is going to be hard and prone to all kinds of problems.

10-22-2005, 06:53 PM	#5
bobo5195 Cooling Savant Join Date: Aug 2005 Location: uk Posts: 400	I thought we were talking about waterblocks only, not radiators as they are complex. My heat transfer notes say that basically C/W for rads is a bit simplistic. It suggests LM with a correction factor to take into account cooling effects inside the exchanger. In other words horrible stuff for consumers and all 4 temps (air, water, in and out) need to be known for you to even get started and they are all a complicated function of each other. As for simplifying assumptions that’s far to much down the road for it to be helpful, in short for rads I don’t think there is a nice way without knocking off a lot of factors so stuff like weather or not your using the inlet or outlet temp is neither hear nor there. My personal opinion is that things like this consumers shouldn’t need to worry to much about. An expansion of LHG approximator with a few good results (and Newton based method for solving the matrix equations) and let the masses choose and play around hidden from the maths beneath, intergrate it into your webpage shopping cart and everyone’s happy. Some non dimensional numbers would be useful as well as a benchmark but getting a company to dosh these out is going to be hard and prone to all kinds of problems.