The inputoutputreference.pdf explains how this works in the Airflownetwork zone control chapter, I think.
The way occupants interact with windows may not be as simple as opening a window at a zone temperature setpoint... basically if the zone is overheating but the outdoor temps are freezing, a user will open the window, become uncomfortable very quickly and shut it again. Although the air exchange rate during such an event is very high, the time is very short. It has been found that such events do almost nothing for controlling zone temperature, CO2-levels and increasing energy usage. You need to model at 1 minute timesteps to capture this kind of effect.
So in cold climates the windows effectively stay shut when the outdoor air temps are too low for comfortable venting. This is the quintessesance of the modulation feature in the AFN object.
Mit freundlichen Grü�en- Sent from my iPhone (excuse the brevity)
i. A.
Jean Marais
b.i.g. bechtold
Tel. +49 30 6706662-23
On 19.06.2014, at 16:35, "allinson_louis@xxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
Hi
I am probably overlooking something really simple
I have a detailed opening window on temperature control, but it is modulating the opening dependent upon the internal/external temperature difference.
I want to look at a very simple on/off control based on internal temperature exceeding a setpoint and therefor want to inhibit this "modulation" based on the internal/external temperature difference
I guess it is something to do with "Indoor and Outdoor Temperature Difference Lower Limit For Maximum Venting Open Factor" but i don't know what value to put into this field
Many thanks
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