Re: [EnergyPlus_Support] PMVET* and PMVSET*

["Michael J. Witte" <mjwitte@xxxxxxxx>]

The following response comes from the developer who implemented the thermal 
comfort routines in EnergyPlus . . .

Looking at the models in the Pierce subroutine, it appears from a relatively 
quick first glance that the main difference between the two calculations is 
that PMVET* uses the following to calculate convection from the body to the 
surroundings:

    Hc = 8.6*AirVel**0.53
    IF (ActMet > .9) THEN
      HcAct = 5.66*(ActMet - 0.85)**0.39
      Hc = MAX (HcAct, Hc)
    ENDIF

When calculating PMVSET*, the following is used to calculate convection from 
the body to the surroundings:

    IF (ActMet <= 0.86) ActMet = 0.86
    HcStd = 5.66*(ActMet - 0.85)**0.39

Both calculations include the operative temperature as part of the process.

However, if the question is why do PMVET* and PMVSET* of the Pierce model 
differ from PMV of the Fanger model, the answer is that there are two 
completely different models with differing modeling techniques.

Mike


On 22 Feb 2008 at 17:14, Danny Bishop wrote:

> Hi All
> Can anyone give me a simpler qualitative explanation of how PMVET* and
> PMVSET* uses the ET* and SET* rather than the operative temperature? How
> does it result in such different values from PMV? Does it take into account
> seasonal variations in average outdoor temperature?
> 
> I have been reading the engineering reference over and over again but I
> can't quite understand this bit.
> 
> Thanks
> Danny
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
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> 




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