Dear Developers,

I get results for PMV with RayMan Pro different from ones calculated with some online calculators (like http://www.eat.lth.se/fileadmin/eat/Term...oe/PMV-PPD.html) using ISO 7730.
Are there some differences in the PMV calculation procedure with RayMayn Pro in comparison with the one of ISO7730,
or that is due to numerical (round off) errors? The discrepancies are for different combinations of temperature,
mean radiant temperature and relative humidity, wind, activity, clothing insulation.

Dear Dominik,

Here it is an example.

Input

AirTemperature MeanRadiantTemperature AirVelocity RelativeHumidity Clothing insulation Activity
22 22 1 50 1 126 W (70 W/m2)
15 18 1 60 1 126 W (70 W/m2)
25 30 1 70 1 126 W (70 W/m2)






RayMan Pro 2.1 © 1999 - 2010
Meteorological Institute, University of Freiburg, Germany
place: Andorra (Andorra)
geogr. longitude: 1°30' latitude: 42°30' timezone: UTC +1.0 h
horizon limitation: 0.0% sky view factor (RayMan): 1.000

date day of time sunr. sunset SDmax SDact SVF_Ray Gmax Gact Sact Dact A E Ts Ta VP RH v C Tmrt height weight age sex cloth. activ. PMV
d.m.yyyy year h:mm h:mm h:mm min min W/m² W/m² W/m² W/m² W/m² W/m² °C °C hPa % m/s octas °C m kg a clo W
12.7.2019 193 11:34 5:27 20:32 904 902 1.000 880.8 880.8 782.1 98.8 346.7 527.8 38.9 22.0 13.2 50.0 1.0 0.0 22.0 1.8 75.0 35 m 1.00 126.0 0.5
12.7.2019 193 11:34 5:27 20:32 904 902 1.000 880.8 880.8 782.1 98.8 309.9 483.5 32.2 15.0 10.2 60.0 1.0 0.0 18.0 1.8 75.0 35 m 1.00 126.0 -0.6
12.7.2019 193 11:38 5:27 20:32 904 902 1.000 885.5 885.5 787.2 98.3 366.5 549.2 41.9 25.0 22.1 70.0 1.0 0.0 30.0 1.8 75.0 35 m 1.00 126.0 1.4


Output from http://www.eat.lth.se/fileadmin/eat/Term...oe/PMV-PPD.html

PMV

-0.52
-2.18
0.79

I used the mean radiant temperature as an input variable. I think, in that case, the location is of no importance.
I calculate the activity input in the RayMan by multiplying the metabolic rate with the mean body surface (1.8 m2).


Best regards