Energyplus output : surface window net heat transfer rate

asked 2020-05-22 22:30:05 -0600

Sachee
31 ●1

updated 2020-05-23 12:33:16 -0600

__AmirRoth__

4446 ●5 ●17 http://bleedinggreenna...

I have modeled a building in Openstudio Sketchup (sketchup make 2016) and simulated in Energyplus to get the output of "surface window net heat transfer rate". I have plotted the monthly and hourly outputs and they shown west window gives higher output in winter months which is not reasonable. So that means the values are not correct. Can someone advice me how can I correct this?

Thanks!

answered 2020-05-24 07:59:34 -0600

Aaron Boranian

14250 ●86 ●24 http://bigladdersoftware.com/

The Surface Window Net Heat Transfer Rate output variable is the sum of many components (transmitted solar radiation, convective losses, etc.), and positive values indicate heat flow INTO the zone through the window. To understand how the west window's net heat transfer rate could be higher in winter, you should add output variables for these other components (transmitted solar radiation, convective losses, etc.). Seeing trends in these components should explain the net heat transfer rate results, such as your building is in the northern hemisphere and excess solar gains at lower altitude angles in the winter are greater than the conduction losses to colder outdoor air in winter.

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As I understood, the definition of Surface Window Net Heat Transfer Rate output variable in energy plus is not correct. The result is not match the definition.