As far as I know using the non-VAV model, the economizer replaces the return air with the OD Air.
If the mixed air node temperature is in the dead band, there will be no cooling or heating.
Otherwise, the other function of the AHU is not changed. The design and choice of the operating temperature range, and the operating temperature difference are the main task
However, the use of VAV, EMS and setpoint manager changed all this, and I would simply say it all depends. (on how the controllers and managers are set up.)
The on and off of the cooling and heating coil should not be dependent on the fan speed. It is the same "set point not met" problem with or without the economizer. How or when to activate the economizer is still a real system learning problem.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jeannieboef@xxxxxxxxx
Date: Tue, 3 Jul 2012 14:00:08 +0000
Subject: [EnergyPlus_Support] Question to Economizer Action
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Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
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If the mixed air node temperature is in the dead band, there will be no cooling or heating.
Otherwise, the other function of the AHU is not changed. The design and choice of the operating temperature range, and the operating temperature difference are the main task
However, the use of VAV, EMS and setpoint manager changed all this, and I would simply say it all depends. (on how the controllers and managers are set up.)
The on and off of the cooling and heating coil should not be dependent on the fan speed. It is the same "set point not met" problem with or without the economizer. How or when to activate the economizer is still a real system learning problem.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jeannieboef@xxxxxxxxx
Date: Tue, 3 Jul 2012 14:00:08 +0000
Subject: [EnergyPlus_Support] Question to Economizer Action
If the Economizer is active and supplying max allowable ODA, may the cooling coil also be active to suppliment cooling needs to meet zone loads if the fan max flow rate is already maxed out?
I hope the one sentance question makes sence. Sorry.
I hope the one sentance question makes sence. Sorry.
__._,_.___
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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