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[EnergyPlus_Support] Re: Modulating Control


Hello All

I have some instability in one of my models.

It is being caused by a ventilation object which is included to 
provide a simple night ventilation strategy, in an office building.
Using the ventilation object,  ventilation is provided  @ 3ACH if the 
internal temperature is above 20C.

I have noticed in the results that the internal temperatures are 
oscillating around 20C during the early morning hours before 
occupation, during summer months.
This is happening because night ventilation is alternating between on 
and off between each time step, (using 10 minute time steps).
The oscillations in temperature are not very big, max amplitude is 
about 1C, but this is enough to impact significantly on the comfort 
predictions from my model.

I have also implemented night ventilation using a unit ventilator in 
another model but I am encountering the same problem.

Is it possible to modulate ventilation based on an internal 
temperature only, instead of modulating it based on a temperature 
difference between inside and outside?

I was hoping somebody might have a simple work around.

Best Wishes

Rory







Rory Walsh
UCD Energy Research Group
School of Architecture, Landscape & Civil Engineering
University College Dublin
Richview, Belfield, Dublin 4, Ireland.
http://erg.ucd.ie


Tel:    +353-1-716 2682
Fax:    +353-1-283 8908



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