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Re: [EnergyPlus_Support] Sensible cooling rate



If the air temperature were maintained at the cooling setpoint all the time, then the PMV would be the same in all the zones unless for some reason they have differing humidities. Are they served by the same AHU? If it is window ventilated, are the ventilation rates equal? AFN would take the building height and stack effect into account. Differing leakage and window ventilation (height dependant) may result in differing humidities.

PMV is basically a function of operative temperature and humidity. operative temperature is almost the average of the mean radiant and air temps. The difference must lay with these factors.

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On 04.03.2015, at 21:27, "Fakeha Sehar fakeha_s@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

I am unable to figure about below

I have three floors, with one core zone and five perimeter zones each. When the core zone cooling set point is 24C, the top floor is slightly more hot (higher PMV index) as it receives more sunlight,  than the mid and bottom floors. Similarly, mid floor has higher PMV index than bottom.

Now when I raise the set point to 27C, I notice that mid floor has the lowest PMV index. Bottom floor has much higher PMV index than mid floor. The sensible cooling rate is higher than that of mid floor, why? Bottom floor PMV index should still have been the lowest.



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Posted by: "jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>


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