PPD & PMV value

Tanty Ali · April 9, 2015, 00:01

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.

ghorrocks · April 9, 2015, 07:09

Please, no jargon. What is PPD, PMV and MRT?

What do you mean by CFX-Pro?

Tanty Ali · April 9, 2015, 10:00

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

Madeinspace · May 22, 2015, 09:15

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!!

Tanty Ali · May 22, 2015, 22:42

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.

Madeinspace · May 23, 2015, 06:53

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.

PRAJWAL PATIL · April 3, 2018, 06:40

Did anyone of you how to find mean radiant temperature in ansys fluent.Please tell I am working on thermal comfort in car cabins.

April 9, 2015, 00:01	PPD & PMV value	#1
Tanty Ali New Member Tanti Ali Join Date: Apr 2015 Posts: 3 Rep Power: 11	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.

April 3, 2018, 06:40	Mean Radiant temperature	#7
PRAJWAL PATIL New Member PRAJWAL JANARDHAN PATIL Join Date: Feb 2018 Location: INDIA Posts: 7 Rep Power: 8	Did anyone of you how to find mean radiant temperature in ansys fluent.Please tell I am working on thermal comfort in car cabins.

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April 9, 2015, 07:09		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Please, no jargon. What is PPD, PMV and MRT? What do you mean by CFX-Pro?

April 9, 2015, 10:00		#3
Tanty Ali New Member Tanti Ali Join Date: Apr 2015 Posts: 3 Rep Power: 11	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

May 22, 2015, 09:15		#4
Madeinspace Member James Join Date: Jan 2014 Posts: 38 Rep Power: 12	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!!

May 22, 2015, 22:42		#5
Tanty Ali New Member Tanti Ali Join Date: Apr 2015 Posts: 3 Rep Power: 11	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.

May 23, 2015, 06:53		#6
Madeinspace Member James Join Date: Jan 2014 Posts: 38 Rep Power: 12	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.