The efficiency of condensing combination boiler is different at 30% load and 100% load. Why is this?-scheattech.com

The efficiency of condensing combination boiler is different at 30% load and 100% load. Why is this?

September 30, 2021

The reason why the efficiency is higher at 30% load than at 100% load is that with the same excess air coefficient (about 1:1), the heat exchange area at 30% load is larger than that at 100% load. That is to say, when the heat exchange area is the same, though the amount of heat received is small, the heat transfer is more effective.

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