CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

heat transfer in solar air heater

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   January 27, 2010, 03:02
Default heat transfer in solar air heater
  #1
New Member
 
A.Siva Arunachalam
Join Date: Aug 2009
Posts: 3
Rep Power: 7
arunachalam.siva is on a distinguished road
Hi friends
I am a new user of cfd forum.
I want to analysis solar air heater in fluent.
I designed solar air heater with fins in gambit.
I apply heat flux in underside of the absorber plate.
I split the solid from fluid volume in gambit.
I analysed this problem in fluent and i got a result.
But when i increase a inlet velocity the base temperature reduced at the same time outlet temerature also reduced.
Our aim is increase outlet temperature with increse in inlet velocity.
Anybody help me for tactle this problem.
arunachalam.siva is offline   Reply With Quote

Old   March 1, 2010, 14:20
Default Energy balance previous to CFD
  #2
New Member
 
Join Date: Nov 2009
Posts: 22
Rep Power: 7
tony00 is on a distinguished road
Hi,
I would do an energy balance of your system: Energy in = Energy out.
Energy in:
1) Your heat flux times area
2) total enthalpy of the incoming air

Energy out:
1) total enthalpy of the heated air

You will see that your results are consistent: for a higher flow rate (you specified higher velocity) you get lower temperature out.

To optimise your solar collector I would recommend you use natural convection model ( you can either use boussinesq or define a temperature dependent air density, first option is best).

Regards
tony00 is offline   Reply With Quote

Old   March 3, 2010, 03:07
Default Thank u
  #3
New Member
 
A.Siva Arunachalam
Join Date: Aug 2009
Posts: 3
Rep Power: 7
arunachalam.siva is on a distinguished road
Thank u for ur reply
I have another doubt
I apply heat flux in base side of the plate
Our sir told apply heat flux in base the temperature of the base only reduce but the temperature of the air does not increase.
Is it right please explain me?
arunachalam.siva is offline   Reply With Quote

Old   April 17, 2013, 14:43
Default
  #4
New Member
 
ram
Join Date: Apr 2013
Posts: 7
Rep Power: 4
ram_call is on a distinguished road
of course as u increase inlet velo, temp will fall in outlet
ram_call is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Convective / Conductive Heat Transfer in Hypersonic flows enigma Main CFD Forum 2 November 1, 2009 23:53
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
air bubble is disappear increasing time using vof xujjun CFX 9 June 9, 2009 07:59
heat transfer: air in a room and water in a coil Alberto CFX 2 May 9, 2006 09:56
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55


All times are GMT -4. The time now is 02:49.