HAP boiler part-load efficiency curves

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Does anyone know what the equations for the part-load efficiency for condensing and non-condensing boiler models are?  The only thing I can find in the HAP Help section is that they are both “…2-dimensional model in which performance is a function of both part-load ratio and hot water supply temperature (HWST).”

Thank you,

MLHardy's picture
Joined: 2010-12-08
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