[Need Help] PMV Value Goes Beyond -3 to +3 limit

Using SimScale Thermal
1

Hello, everyone.

I want to obtain the PMV and PPD values of a structure to evaluate its thermal comfort. However, the ranges I’m getting for the PMV goes beyond the -3 to +3 limit. I am unsure what to do. Is this normal?

The simulation type is conjugate heat transfer.

Project link: https://www.simscale.com/workbench/?pid=7437006603631666431&mi=spec%3A3b046f60-0cb6-488a-abe3-57610922f82f%2Cservice%3ASIMULATION%2Cstrategy%3A3

Thank you.

2

Hi @rdelacruz ,
based on the formulas, a value for PMV outside of the -3 to 3 range is totally possible, as we do not clip the range explicitly at 3.

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you can see that in your results the max PMV at the height of 1.9m is above 8, but at the same point you also have a temperature above 45 DegC.
The area of high temperature is right above the modeled “humans” which generate a lot of heat.
You applied a surface heat source of 420W/m^2 - and each occupant has a surface area of 3.65m^2 (0.5m wide, 1.7m high), generating a total heat of 1533W per occupant!
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I guess you shoud review your heat load BC on the occupants, then you should also bet back into a reasonable range for PMV and PPD.

Best,
Richard

2 Likes
3

Hey, rszoeke!

Thank you so much! This is very insightful.