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RE: [EnergyPlus_Support] two seperated package air conditioners in one zone

In a real situation, each window unit has its own thermostat measuring the return or exit path air temperature.
If a second  adjacent unit is providing too much cooling, the return air to this first unit is also cooled, and therefore both may turn off, if both return air temperature have reached limiting temperature.  They may not turned on and off in sync, because of different zone load.
In EPlus, because there is only one zone theremostat, it is not possible to simulate the above situation.

However, if the large zone is partitioned with IRtransparent walls, the zones are now separate without air mixing, but are still connected by IR radiation.
The absence of air mixing in each timestep may cause some temperature difference between the adjacent zones.  If a zone is sufficiently cooled by the other zones, the unit will turn off, but is still monitoring the temperature of its own zone.
If you now introduce some air mixing from a zone in the center of the room with a master thermostot but no cooling unit,  it will be interesting to see how the other units react to cool the centre zone.
 Dr. Li  


To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: lesthesia@xxxxxxxxxxx
Date: Thu, 30 Dec 2010 09:07:57 +0000
Subject: [EnergyPlus_Support] two seperated package air conditioners in one zone

Hello fellows.
I have a question regarding multiple systems in one zone.
Assuming that there is a large space in which just one package air conditioner isn't enough to capable the thermal loads.
To clarify my situation I assume it as the single zone package terminal air conditioner.
To imitate the real situation I want to setup multiple package system(more than two) in one zone. Their cooling cycle is seperated.
Those systems should work at the same time. I don't wanna set the priority of them.
Could someone give me a precious idea or a advice regarding this matter?

Thanks in advance
Best regards.

Happy new year!


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