fresher in heat transfer and solar load model

itsme_kit · January 30, 2014, 09:34

My case is that a 3d building situated within an air domain. I have done the solar calculation. I confused about How to set the thermal and radiation boundary condition of air walls. Opaque or semi-tranparent? I tried to select semi-transparent and set all the terms in transitivity section in 1, but I'm not sure is it correct? For the 3d building, I applied subtraction to remove solid body from the air domain, so finally only the surface of building left. I wonder how to work out the external emissivity and heat transfer coefficient if I put those thermal condition in the air wall. Another question is that if we assume a people inside the air domain, there must be a heat generation rate. What's the typical value of heat generation rate of people and for the mesh of people, do we just put a small-volume cube inside the domain and set each side with same heat generation rate?

Look forward to hearing from you

Thanks in advance

sarica 10092 · April 2, 2015, 15:27

does anyone know how I can help CFD software (SOLAR LOAD, SOLAR RAY TRACING) computed flux of radiation absorbed solar parabolic dsih concentator in its focal plane of absorber spiral pipe receiver?

Thank you very much

Sasa

Johnny leow · November 9, 2015, 02:14

Hi, @Sarica 10092.
May i ask that do you can solve this problem? I'm also facing the same problem now? May you share some knowledge with me?
Thank you.

Johnny leow · January 2, 2016, 02:04

Quote:

Originally Posted by sarica 10092

does anyone know how I can help CFD software (SOLAR LOAD, SOLAR RAY TRACING) computed flux of radiation absorbed solar parabolic dsih concentator in its focal plane of absorber spiral pipe receiver?

Thank you very much

Sasa

May i ask that do you can solve this problem? I'm also facing the same problem now? May you share some knowledge with me?
Thank you.

shadnia · January 11, 2016, 12:12

Quote:

Originally Posted by itsme_kit

My case is that a 3d building situated within an air domain. I have done the solar calculation. I confused about How to set the thermal and radiation boundary condition of air walls. Opaque or semi-tranparent? I tried to select semi-transparent and set all the terms in transitivity section in 1, but I'm not sure is it correct? For the 3d building, I applied subtraction to remove solid body from the air domain, so finally only the surface of building left. I wonder how to work out the external emissivity and heat transfer coefficient if I put those thermal condition in the air wall. Another question is that if we assume a people inside the air domain, there must be a heat generation rate. What's the typical value of heat generation rate of people and for the mesh of people, do we just put a small-volume cube inside the domain and set each side with same heat generation rate?

Look forward to hearing from you

Thanks in advance

Dear Ke
May I please ask how did you do solar calculation? In my case, No matter what I put for direct solar irradiation and diffuse solar irradiation, I get 0 for solar loading. Any help will be greatly appreciated!

January 30, 2014, 09:34	fresher in heat transfer and solar load model	#1
itsme_kit Senior Member Join Date: Jan 2012 Posts: 197 Rep Power: 15	My case is that a 3d building situated within an air domain. I have done the solar calculation. I confused about How to set the thermal and radiation boundary condition of air walls. Opaque or semi-tranparent? I tried to select semi-transparent and set all the terms in transitivity section in 1, but I'm not sure is it correct? For the 3d building, I applied subtraction to remove solid body from the air domain, so finally only the surface of building left. I wonder how to work out the external emissivity and heat transfer coefficient if I put those thermal condition in the air wall. Another question is that if we assume a people inside the air domain, there must be a heat generation rate. What's the typical value of heat generation rate of people and for the mesh of people, do we just put a small-volume cube inside the domain and set each side with same heat generation rate? Look forward to hearing from you Thanks in advance

April 2, 2015, 15:27	ray tracing simulation of Solar parabolic dish concentrator	#2
sarica 10092 New Member Mechanical Enginnering Join Date: Apr 2015 Posts: 1 Rep Power: 0	does anyone know how I can help CFD software (SOLAR LOAD, SOLAR RAY TRACING) computed flux of radiation absorbed solar parabolic dsih concentator in its focal plane of absorber spiral pipe receiver? Thank you very much Sasa Johnny leow likes this.

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November 9, 2015, 02:14		#3
Johnny leow New Member Johnny Join Date: Mar 2015 Posts: 6 Rep Power: 12	Hi, @Sarica 10092. May i ask that do you can solve this problem? I'm also facing the same problem now? May you share some knowledge with me? Thank you.