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Poblem with simulation

Posted Dec 6, 2012, 2:42 p.m. EST Fluid & Heat, Geometry, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.3 1 Reply

Vincent Gig
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Hello all

I build a solar collector whith COMSOL 4.3 by using Heat transfert in fluid.
The model run well but whe I want to increase the air gap between the glass and the pipe the temperature of the water doesn't increased.
Can you help me please?
1 Reply Last Post Dec 6, 2012, 3:46 p.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Dec 6, 2012, 3:46 p.m. EST
Hi

you need to first describe better your geometry, including adding dome dimenions, else we cannot really understand much, just as its usefull to define the 1D, 2D or 3D dimension you use, and the physics names HT or NITF or ?

And then, if you believe the physics is not coupling, check your energy densities, your heat fluxes etc.

Now air is in certain cases a good isolator, particularly if you block the flow, or if the pressure is low

--
Good luck
Ivar
Hi you need to first describe better your geometry, including adding dome dimenions, else we cannot really understand much, just as its usefull to define the 1D, 2D or 3D dimension you use, and the physics names HT or NITF or ? And then, if you believe the physics is not coupling, check your energy densities, your heat fluxes etc. Now air is in certain cases a good isolator, particularly if you block the flow, or if the pressure is low -- Good luck Ivar

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