Re: [TRNSYS-users] Calculation of PMV and PPD

["Arie Kalkman" <A.Kalkman@chri.nl>]

Dear Kim,

The only check I ever did was at: clo 0,7/ 1,2 Met/ RH 50%/ v=0,1 m/s,   at
temperatures around 25,5 C this yields the expected result around PMV=0,5 in
accordance with ISO 7730.
The PMV is sensitive to small differences in RH, which can be a possible
origin of the difference between a TRNSYS simulation with a calculated RH
and manual calculations according to ISO 7730 using a fixed RH value.

Kind regards, Arie


 
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-----Oorspronkelijk bericht-----
Van: Kim Goethals [mailto:kim.goethals@ugent.be] 
Verzonden: vrijdag 14 maart 2008 15:19
Aan: trnsys-users@engr.wisc.edu
Onderwerp: [TRNSYS-users] Calculation of PMV and PPD

Dear TRNSYS users,

When I compare the outputted PMV and PPD of TRNSYS with the results 
which I have calculated using the equations in accordance with ISO 7730, 
the PMV and PPD differ on average respectively 0.18 and 10. At first I 
have used the mean surface temperature of the room. I have also 
calculated the mean radiant temperature estimated from the values of the 
plane radiant temperatures for a sitting and a standing person with 
different orientations. However, none of the calculated values of the 
mean radiant temperature produces the same PMV and PPD as outputted in 
TRNSYS. Can somebody explain me this?

Thanks in advance,
best regards,
Kim

-- 
kim goethals

engeneer-architect

department of architecture and urban planning

faculty of engineering

ghent university

t + 32 (0)9 264 78 61

f + 32 (0)9 264 41 85

www.architectuur.ugent.be