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[EnergyPlus_Support] Controlling windows in one zone based on the temperature of a non-adjacent zone



Hello,

 

I was wondering if it is possible to control the opening/closing of windows in one zone based on the temperature of another zone in the model not adjacent to the first. This is because I'm trying to emulate passive downdraught evaporative cooling (PDEC) in a multi-storey office building. For Simplicity, I'm starting with a single office floor model that consists of three zones; a PDEC zone, an ATRIUM zone (spanning three floors in height), and an OFFICE zone. I've uploaded a schematic of the model to the user exchange folder in the files section:

 

http://f1.grp.yahoofs.com/v1/AAOvTY7uC2gK0JzgM4fCqonvr5UhhE0zFSEcx75GgblUJLmGfFFv6FPpX9tGOyapgd-lSSBv6Xne-QLj5YFwHR_7XAmrtITcFA/User%20Exchange/Controlling%20vents.jpg

 

The temperature of the PDEC zone is controlled using ZoneHVAC:IdealLoadsAirSystem with a setpoint that changes each hour as a function of the difference between the external dry bulb temperature and the wet bulb depression to emulate the evaporative cooling process. The PDEC zone is located at the upper end of the ATRIUM's north wall while the OFFICE zone lies at the lower end of the ATRIUM's south wall. The ATRIUM is connected to the two zones by vertical interior windows. The PDEC and OFFICE zones have exterior windows on the walls opposite to the atrium, i.e. the PDEC zone has a north exterior window while the OFFICE zone has a south exterior window. The ATRIUM also has an exterior window at the upper end of its south wall, i.e. opposite the interior window connecting it to the PDEC zone.

 

The intended flow pattern is such that external air flows into the PDEC zone where it is cooled, then into the ATRIUM where it flows downwards (due to negative buoyancy) and finally through the OFFICE where it exits the building from the exterior window at its south wall..

 

What I'm trying to achieve is to control the opening at the PDEC/ATRIUM interface so that it is only opened when the internal temperature of the office zone exceeds 26 oC and at the same time to close the exterior window on the upper end of the ATRIUM's south wall. When the internal temperature of the OFFICE zone falls below 26 oC the opposite should occur. I've already specified the three zones using AirflowNetwork:Multizone:Zone and the five linkages in the model using AirflowNetwork:Multizone:Surface. The openings are all defined using AirflowNetwork:MultiZone:Component:DetailedOpening.

 

The Ventilation Control Mode field in the AirflowNetwork:Multizone:Surface object only allows for the temperature of adjacent zones to control an opening but as I've described above this is not the case.

Any suggestions on how to overcome this problem?

 

Your help is much appreciated.

 

Thank you,

Omar



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