SHGC

Question

Hello, 
 
 we have a SHGC that we are inputting however it doesn't seem to be making any changes to the Heat gain simulation we are running. 
 
 we did some playing about with the env. average, env.cyclic light and env cyclic hvy when we change these it makes drastic changes is there something we are doing wrong or are we changing the wrong cell for the G value?

Stephen Brown · Accepted Answer

Hi Kyle, 
 I assume you're doing a CIBSE calculation which uses the Solar Gain Factors and U-Value for it's calculations. Shading coefficient and SHGC are not used in that calculation. More info can be found in this Wiki. 
 Best Regards Steve

Stephen Brown · Answer

Hi Kyle, 
 As per my previous reply the CIBSE method does not use G Values or shading coefficients. It only uses Solar Gain Factors. If the manufacturer can provide both longwave and shortwave shading coefficients then you can calculate Solar Gain Factors by following the equations in this Wiki which is mentioned in the original link I sent, under the Data for Design Database Calculations section. 
 Best Regards Steve