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Old   April 8, 2015, 23:01
Default PPD & PMV value
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Tanti Ali
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Hello,

I'ma new user to CFX ANSYS 15.0.

I did a comparison between simulation on occupied room thermal comfort study. I have a few problem,

1.How can I calculate the PPD & PMV?

2. So far I can get the MRT calculation by the comfort factor macros. Yet it can't be displayed in CFX-Pro on the surface.

Please do advise.

Thank you.
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Old   April 9, 2015, 06:09
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Glenn Horrocks
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Please, no jargon. What is PPD, PMV and MRT?

What do you mean by CFX-Pro?
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Old   April 9, 2015, 09:00
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Tanti Ali
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MRT (Mean Radiant Temperature)
PMV (Predicted Mean Vote)
PPD (Predicted Percentage of Dissatisfied)

I already followed the guide "A CFD-Post macro is available for this purpose, and is accessed using the Macro Calculator from the Tools menu". In the solution part, I plot the MRT contour on the plane but the results is failed. But when the calculator calculate it showed a value for the plane.

By means, in the legend of MRT, contour for T=289K is yellow color but when I plot on the surface, the yellow color did not appear.

I have found comfort-factors.ccl and usr_pmvppd.F file but I have failed here.

The CFD-Pro is a typo error.

Please do advice.

Thanks
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Old   May 22, 2015, 08:15
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Jiangxi
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Hello Tanty Ali,
I am also working on a similar project. Since you have figure out how to plot MRT in ANSYS. Could you please do me a favor and tell me, what model does ANSYS CFX uses to calculate mean radiant temperature and what is the equation for it?
As far as I know it doesn't use the conventional ASHRAE method to determine the MRT based on surrounding wall temperature.
I would really appreciate your help.
I will have to plot PMV and PPD but I am now in very initial stage and not really familiar with ANSYS CFX. So at first I just wanted to know the equation of MRT used by CFX.
Regards!!
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Old   May 22, 2015, 21:42
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Tanti Ali
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Hi Madeinspace,

I haven't solved yet the MRT, PPD and PMV issues. Maybe because i can't access to fortran compiler.

Sorry for this.I have changed the simulation to Flow Simulation using Solidwork cos I'm running out
of time for submission.

Regards.
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Old   May 23, 2015, 05:53
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Yes,
Flow simulation is very easy with powerful GUI. I have also been using Flow Simulation but been advised to change to CFX. So I was trying to give it a try.
Thanks anyway.
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