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:
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I am modeling an unconditioned single-zone building in the summer, and the zone temperature seems to be much lower, on average, than the ambient outside air temperature. This seems strange because I have no cooling of any kind in my building. I attached a picture of my plot - blue is my outside air temperature, and red is my zone temperature. What could be the problem?
It is impossible to say for sure what the issue is without looking at the project file. However, people commonly overlook connecting a ground temperature to the building model. If the ground temperature is not connected, it is 0 by default, which means any surface in contact with the ground is acting as a heat sink for your building. Check your connections for both TSGROUND (the surface ground temperature) and TGROUND (the ground temperature). The ambient air temperature is usually a decent approximation for ground temperature if your building sits on the ground surface, or you could use the simple ground temperature model (Type 77, in the Physical Phenomena folder) to approximate ground temperature at different soil depths.
