Welcome to the TRNSYS Users Forum.
The forum is a place where people can interact and have discussions about different topics involving the use of the TRNSYS software package. Here you can post topics for discussion or questions on using TRNSYS and get advice from other users or TRNSYS experts. This forum is not intended for detailed technical support. Users should contact their distributor’s hotline for such assistance.
Some tips for success on using the forum:
- Follow the Forum Rules posted in Forum Administration.
- There are categories for different types of topics and questions. Post your topic or question into the proper category.
- Before posting a topic or question search the existing topics (and the TRNSYS Users listserv archive or Post archive) to see if a similar topic or question has already been answered.
- Use a descriptive topic name. Don’t use attention getting subjects, they don’t get attention and only annoy people.
- State the version of TRNSYS and which add-ons your are using.
- Include enough specific details for your topic of question to be answered. Just posting “Why am I getting an error?” without describing the specific error and what you are trying to do when you get the error will not receive a response that fixes your issue.
- Remember when people help you, they are doing you a favor. Be patient, help people out by posting good descriptions of what you need help with, and be polite even if a response does not solve your issue.
- Moderators may edit your post for clarity or move your topic to a more appropriate category.
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
