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Sizing flat plate heat exchanger
I have 230k BTUH worth of baseboard in a sperate building from my boiler which needs to be heated, however, it needs to be filled with antifreeze since that building is only used in the summer spring and fall, and turned off during the winter.
To handle this I plan to use a flat plate heat exchanger and a buffer tank off the main boiler (in the adjacent building which is always heated) which is sized for both buildings.
I'm running into trouble sizing a plate heat exchanger though since specs are typically for radiant low temp, snowmelt, or domestic uses. How would one calculate or determine the necessary size heat exchanger for this purpose?