People Dissatisfied

[Dav]

Hi all,

As far as I know, PPD index is representative of thermal comfort in the room concerned.
However, I get a PPD around 25% while my room average air temp is around 24, my RH about 55% (Tdew=14, moisture = 100g/kg, etc.), which comply with EN standards....With these values, I usually get a PPD around 15%...

Is there any other parameter taking into account in IES VE for PPD evaluation?

Thanks,

Dav

[KasperS]

Hello

You say your average temperature is 24 °C. This means there will be many hours where it is 25 and 26 °C which will make people dissatisfied. Instead of using averages you should count the hours of a specific temperature and use that as an indication. The reason i would do this is, that its easy to get a good average, like if you have 25 % of the time with a tempature of 20 °C, 25 % with 22 °C, 25 % with 26 ° and 25 % with 28 °C. I am pretty sure more than 15 % would be dissatisfied with this.

Kasper

[david373348]

in the definition of PPD and PMW comfort probabilities there are already 5 or 10% (I don't remember well) of the people which it will be dissatisfied even if you put them in Hawaii with a beer on the size

So you need to take this in account for your analysis,

Regards

David Garcia
greenaffair.