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[EnergyPlus_Support] Modelling roof ducting

Hello everyone,

I have a simple system which is proving to be quite difficult to model, so any suggestins would be most appreciated!

I have roof ducts (just under the roof) in which the air is warmer (due to conduction of heat from the heated roof above). I would like to use this warmer air to heat a room in the house. I have a fan so can duct the warmer air into the house at a set flow rate.

Question is: how do I model this in Eplus?

The support group suggested using EMS, so I looked at having purchased air with the temp of the purchased air being the temp of the roof ducts. The EMS code would set the temp of the purchased air by pulling off the temp of the roof ducts.
However, apparently I do not have access to the temp of purchased air to set as part of the code. 

The support group suggested I use a window a.c unit to set the outdoor air conditions, and only use the ac unit  as a fan.

Just wondering if anyone could give me further suggestions or help regarding this?

Thanks a lot

Julie



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