Is there an optimal temp exchange between the water temp entering water to air heat exchanger in a furnace plenum and the water temp exiting?
Terry
Terry
HX Delta T
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WoodNotOil
Minister of Fire
Many of these devices are really designed for the water be at 180* and as you get lower in temp the amount of btus you can get goes down too. If you want to be able to make use of lower temps, then you will need to size the hx larger so that it will meet you needs with lower temp water.
I have found that the temp difference between entering the HX and exiting it has always been around 17 degrees. (delta T) It does not seem to matter if the entering temp is 180 or 150. Just wondering if there is a way to increase the delta T. I have tried using different speeds on the 3 speed circ and found that the fastest speed gave the me the highest delta T. I guess increased fan speed might help.
WoodNotOil
Minister of Fire
I get your question now. In general you want as high a delta T as possible and that indicates that you are getting the most heat out of the hx. Yes a higher fan speed will give you more heat output and a higher delta T. If that is what you are after, then you are on the right track.
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