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New Boilers, Old Building
I have a client asking to run his large multi-family residential building at "condensing temperatures", but is not replacing the fin tube radiation.
Original plans call for the heating system to operate 210F - 190F. He wants us to design for a return water temp of 150 F. I think we can do a reset schedule based on OA temp... but won't I have flow and heat output issues trying to get existing equipment to run at these lower temps?
Does anyone have experience with something like this? Horror stories? I can't see a way to magically make the fin tube run at a higher delta T... and an average temp that much lower derates the output by 50% at least.
THANKS FOR YOUR HELP AND EXPERTISE!