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



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.

HJ


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