IES-VE User Forum

Hi everyone,

I'm doing a project using IES-VE and have created the model. I assigned thermal properties and constructions and thermal profiles. The weather file is specified as well. After simulation, however, air temperature and cooling loads, etc. show the value 0, and in some cases the message 'unable to sum variables'. Can anyone tell me what could be wrong here?

Have you got an Apache System applied to the HVAC system of the rooms? Without this it will think the room is unconditioned and therefore return an overall load of 0.

For cooling loads, you also need to make sure the Apache System has it's cooling mechanism set to 'Air Con'.