Modeling a vacuum region in solar collector with fluent

amirokhovat · July 9, 2014, 14:04

Hi guys,

I'm modeling an evacuated solar collector that have two Concentric tube. outer tube is glass tube and inner tube has solar absorber to absorb solar irradiation. Between two tube we have vacuum and provide an isolation region. sun irradiation hit to outer glass tube and Sunlight passes through the glass tube and vacuum region, hit to absorber. fluid in the inner tube is water. because of thermosiphon Phenomenon, heat water go to a tank.
I want to model this system with fluent. I use DO radiation model and solar ray tracing. what is the value of absorption and scattering coef. and refractive index for absorber and glass?? How can I model vacuum region? Is density of vacuum very low value (i.e. 1e-10)??

Muhammed_iraq · October 23, 2014, 16:54

Please amirokhovat i need your help about solar radiation and make it as a heat flux boundary condition by using ANSYS-FLUENT

amirokhovat · November 4, 2016, 07:36

contact with me by my email
amir.okhovat@gmail.com

July 9, 2014, 14:04	Modeling a vacuum region in solar collector with fluent	#1
amirokhovat New Member amir okhovat Join Date: Sep 2011 Location: Iran- Isfahan Posts: 24 Rep Power: 15	Hi guys, I'm modeling an evacuated solar collector that have two Concentric tube. outer tube is glass tube and inner tube has solar absorber to absorb solar irradiation. Between two tube we have vacuum and provide an isolation region. sun irradiation hit to outer glass tube and Sunlight passes through the glass tube and vacuum region, hit to absorber. fluid in the inner tube is water. because of thermosiphon Phenomenon, heat water go to a tank. I want to model this system with fluent. I use DO radiation model and solar ray tracing. what is the value of absorption and scattering coef. and refractive index for absorber and glass?? How can I model vacuum region? Is density of vacuum very low value (i.e. 1e-10)?? sayfdin likes this.

October 23, 2014, 16:54	Fluent	#2
Muhammed_iraq Member Muhammed Asmail Join Date: Nov 2009 Location: Iraq Posts: 43 Rep Power: 17	Please amirokhovat i need your help about solar radiation and make it as a heat flux boundary condition by using ANSYS-FLUENT

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November 4, 2016, 07:36		#3
amirokhovat New Member amir okhovat Join Date: Sep 2011 Location: Iran- Isfahan Posts: 24 Rep Power: 15	contact with me by my email amir.okhovat@gmail.com