Quote Originally Posted by Erasmus354 View Post
Great post rosco, thanks for the input. However, riddle me this:

So we are assuming that the air reaches water temp by the time it leaves the radiator. On any curve on the chart you have a constant airflow and a variable flow rate. You should as you said reach a point where the curve plateau's and it shouldn't go back down. At this point you have reached the limit of what the air can absorb. Since the airflow is constant, air in is constant (20C for arguments sake), air out is constant (30C - water temp), you should have constant temperature dissipation. You have the same flow of air through the same area with the same change in temperature. Yet obviously your measurements show that the water temperature is not decreasing by the same amount. It is decreasing less, so how is the air increasing by the same number of watts but the water is decreasing by less and less as the flow rate increases? You are gaining energy somewhere, it just doesn't make sense.
Air temp would be equal to water temp if you have full (100%) water to air heat transfer, meaning the radiators are 100% efficient. I am running into weird numbers on my second round of radiator reviews because I am seeing 100%+ effeciency of water to air heat transfer, and I am controlling flow.

So I am going back through and using the water in sensor in my water average numbers for calculated C/W. The water temps do rise (~.2-.4C, thus far), but this does change the calculated C/W. I do not have enough data sets converted yet to show a C/W chart for any of the 6 triples tested. I will share the differences as soon as I can get at least one radiator using the new formulas.