Hello,

I believe there is a mistake in the formulation of the conduction input wall 
for Trnsys Type 19, can someone confirm?

Equation 4.8.3.22 in the manual states that X_i=(Q_i/A_i +s_i)/hc_i for 
conduction input walls and that the equivalent temperature should be used in 
calculating Qi or else the effects of absorption of radiation on the inside 
surface would not be correctly accounted for.  

Equivalent temperature includes effects of s_i and the longwave radiation from 
other surfaces.  Wouldn't including s_i in equation 4.8.3.22 be double counting 
of the absorbed radiation on the surface if T_equivalent is used?  If we use 
zone temperature instead of equivalent temperature, the effect of longwave 
radiation would not be included.

Rémi

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