High Zone mean air temperatures

asked 2020-10-28 12:01:29 -0500

DavorJ gravatar image

updated 2020-10-28 19:03:27 -0500

Hi, I have an issue with Zone Mean Air Temperature. I haven't defined any heat gains in the zone and there is no heating or cooling in the zone itself. There is ventilation defined in the zone that is 0.5ach. Also, the U-values of walls and windows are 0.3 and 1.5 W/m2K, respectively. I have an issue that when outdoor air dry-bulb temperature is 8 degrees celsius, zone mean air temperature is 28 degrees celsius, or when outdoor air dry-bulb temperature is 6.25 degrees celsius, zone mean air temperature is 24.5 degrees celsius (mainly at 15:00). There are no heating loads in the room, nor there are heating and cooling, I don't know what can cause such an increase in the temperature of the room, are solar gains really that much increasing the mean temperature of the zone?

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Comments

@DavorJ could you include a link to your EnergyPlus input file (IDF) so that others can review the model? You may not have "real" heating or cooling in the zone but still have the Ideal Loads Air System serving the zone.

Aaron Boranian gravatar image Aaron Boranian  ( 2020-10-28 14:19:47 -0500 )edit

Hi @Aaron Boranian, thank you for your comment. I uploaded the IDF on the following link https://easyupload.io/ihkqzw. It is a very simple IDF with only ventilation. Also, I used E+ version 8.4 for simulations, so this IDF is for that version. Let me know if you need anything else (you can run the simulations and see the output temperatures, those are already defined in "Output variables").

DavorJ gravatar image DavorJ  ( 2020-10-29 11:31:24 -0500 )edit