If you were to lower the heating water supply temperature of a U-tube shell-and-tube heat exchanger (water to water) while maintaining the same delta T, the performance would decrease unless a new heat exchanger were selected for the new supply temperature, correct? I was discussing retrofitting an old heating water system with a new condensing boiler, and reducing the supply water temperature of the system to take advantage of the new boiler's efficiency, but I'm assuming that would also require replacing all of the heat exchangers which are already on the system. Can anyone provide additional resources on this topic? Thanks.
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