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Dear TRNSYS-Users,
i am currently modelling a multizone-building to research its resilience against overheating. I just implemented shading devices for my windows and now as i am comparing the results, i see that there is one room, that has slightly higher temperatures with the shading device than without.
This room has a lot of windows which point north (so dont get a lot of radiation). As i am also using these windows for ventialtion, i assume, that my shading devices also have an impact on the airflow through that window. Can anyone confirm this theory or has another idea, why a shading device could lead to higher temperatures?
The devices are controlled manually on the base of a schedule and not by radiation-values.
Thanks in advance
Cheers
Jakob
Jakob,
When you add a shading device, it impacts only the radiation exchange. There is no coupled impact on the way that air flow is being handled. The air flow model in Type56 is implemented manually either by defining a TRNFlow or CONTAM (Type97/98) model or by specifying infiltration and interzonal air flow rates. So unless you added something along with the shading device to account for its impact on the ventilation then I suspect that something else explains the temperature change.
My guess about the shading device would be its reflectance / absorptance values. It may be that by implementing the shading device you are trapping longwave radiation in the zone that otherwise might have gotten back out, especially at night.
kind regards,
David
