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How to define minimum indoor temperature for natural ventilation in EnergyPlus?

asked 2014-12-07 14:22:32 -0500

I was wondering how it's possible to define minimum indoor temperature as an input for natural ventilation while using Air Flow Network in EnergyPlus?

In EnergyPlus, by defining "AirflowNetwork:MultiZone:Zone" or "AirflowNetwork:MultiZone:Surface" it is possible to define "Indoor and Outdoor Temperature Difference Lower Limit" and "Indoor and Outdoor Temperature Difference Upper Limit", but there is no field to define minimum indoor or maximum outdoor temperature.

Thanks a lot in advance for your help!

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answered 2014-12-08 08:30:46 -0500

In those objects, specify Ventilation Control Mode=Temperature: All of the zone’s openable windows and doors are opened if Tzone > Tout and Tzone > Tset and Venting Availability Schedule (see below) allows venting. The Ventilation Control Zone Temperature Setpoint Schedule holds the setpoint temperatures which are the minimum indoor temperature. There is no input for maximum outdoor temperature. If the other inputs are not sufficient, you would need to use EMS to act on the venting availability schedule to shut off ventilation as needed.

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Thanks a lot for your answer! but I have some problems using setpoint schedule. Would you please tell me if I should choose a schedule with schedule unit type of "temperature" and setting the Tset as "lower limit value" or "upper limit value" or I am in wrong track? I tried to do that, but unfortunately when I check the outputs seems it doesn't work properly.

Pouya's avatar Pouya  ( 2014-12-08 10:26:10 -0500 )edit

The schedule should have temperature values in it and it functions as a setpoint for the ventilation, so it is both the upper and lower limit. If the zone temperature rises above this setpoint, then the ventilation will try to cool the zone down to the setpoint (if the other conditions are met).

MJWitte's avatar MJWitte  ( 2014-12-08 15:15:34 -0500 )edit

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Asked: 2014-12-07 14:22:32 -0500

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Last updated: Dec 08 '14