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RE: [EnergyPlus_Support] UFAD and displacement use more energy for heating than well-mixed system

There should be no difference as heat loss from the building doesn't change. However check your supply air temps and outside air settings. If your supply air temp is lower than the mixed system and outside air is delivered as a percentage of supply air, your air volume will be higher, and as a consequence so will your outside air. More outside air more heating. More air volume is more fan power unless you reduce static pressure or raise supply air temp.

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From: HJ <wanghaojie630@xxxxxxxxx>;
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>;
Subject: [EnergyPlus_Support] UFAD and displacement use more energy for heating than well-mixed system
Sent: Fri, Sep 27, 2013 4:23:13 PM


Dear all,

I did a simulation and found that UFAD and displacement ventilation uses
more heating energy than well-mixed system. I read the engineering
reference and think UFAD and displacement will be modeled the same as
well-mixed system for heating. Only in cooling the temperature
stratification modeling is used. So does anyone have any idea why this
might occur? All the other conditions are the same.



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