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 Giovanni May 7, 2003 08:53

electrical resistance of a oven

I have to do a transient analysis of a kitchen oven.

The electrical resistance drains 1600W.

Is it sufficient to impose an equivalent heat flux on the surface of the resistance?

Thank you Giovanni

 Holidays May 7, 2003 09:04

Re: electrical resistance of a oven

Could you do a solid sub domain with the equivalent volumetric heat source associated (CHT)?

 Harry Fulmer May 7, 2003 09:46

Re: electrical resistance of a oven

You would have to do CHT as the heat flux budget (convective/radiative) from the element is ciritical in oven modelling. Conduction from the element out of the oven would also account for some of the total dissipation although I'm not sure if that would be a dominant heat loss mechanism.

 gorka May 7, 2003 11:31

Re: electrical resistance of a oven

Hi,

I think it depends on whether your code is able to calculate radiation and to impose Qconv + Qrad = 1600 in the resistance, obtaining the amount transfered by convection (Qconv) and the amount transfered by radiation (Qrad) as a result.

Regards,

Gorka

 Giovanni May 8, 2003 03:16

Re: electrical resistance of a oven

Thank you to everyone,

I'm using Star-CD. I hope that the code is able to calculate radiation and to impose Qconv + Qrad = 1600 in the resistance. At this moment I cannot model the resistance as a solid. I have not enough time. So I'm imposing a flux of 1600W. But the question is: is it really true that the flux is exacly 1600W, and in a transient analysis should I impose it gradually?

Thank you Giovanni

 gorka May 8, 2003 04:07

Re: electrical resistance of a oven

Hi Giovanni,

Fluent can do that, I guess Start-CD can do it too. I think that the flux transfered to the oven should be the power drained by the resistance (maybe, minus a part transfered by conduction as other colleague pointed out).

In regard with the transient, I guess the electrical transient will be much faster and the 1600W power drain will be stablished very fast.

Best Regards,

Gorka

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