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Thermal resistance in non-isothermal pipe flow (nipfl)

Posted 03.05.2016, 09:30 GMT-4 Fluid & Heat, Heat Transfer & Phase Change, Geometry, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.4, Version 5.0, Version 5.1, Version 5.2 2 Replies

Amin Jahanbin
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Gooday,

I'm using non-isothermal pipe flow model and heat transfer in solids physics in order to simulate a bore hole heat exchanger (BHE). the problem consist of a tube modeling by nipfl and a ground around the tube modeling as a solid heat transfer. The program seems to simulate the problem in a reasonable way but when the thermal resistance (R) is calculated, the obtained R by Comsol is higher almost 30 % compared with R obtained by formula or 2D model. I guess since this module simulate the pipe flow as a 1D problem and there is a gap between the pipe and solid which in graphics shows as a solid part, it adds the value of thermal resistance. Can anyone help or has a suggestion?

In attachment you can find the file.

kind regards,
Amin

Attachments:

2 Replies Last Post 12.09.2016, 07:08 GMT-4
COMSOL Moderator

Hello Amin Jahanbin

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Qiva Chandra
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Posted: 8 years ago 28.08.2016, 17:27 GMT-4
Dear Mr. Jalabin,

right now i'm still in research for modelling heat transfer in geothermal system using nipfl and heat transfer in solid. My research is about predicting the temperature of reservoir time dependent. I've got similar problem, heat transfer between pipe and solid ground is too fast and i think the problem is the same with yours. Can anyone help or give a suggestion ?

thank you
Dear Mr. Jalabin, right now i'm still in research for modelling heat transfer in geothermal system using nipfl and heat transfer in solid. My research is about predicting the temperature of reservoir time dependent. I've got similar problem, heat transfer between pipe and solid ground is too fast and i think the problem is the same with yours. Can anyone help or give a suggestion ? thank you
Amin Jahanbin
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Posted: 8 years ago 12.09.2016, 07:08 GMT-4
Dear Qiva,

I changed my using module (nipfl to ht). Because as far as I could see, it was not an appropriate one for predicting such sensitive term like thermal resistance. Now, i am using the module of heat transfer in fluid and solids and it did work.

Hope it help you too.

Kind regards,
Amin Jahanbin
Dear Qiva, I changed my using module (nipfl to ht). Because as far as I could see, it was not an appropriate one for predicting such sensitive term like thermal resistance. Now, i am using the module of heat transfer in fluid and solids and it did work. Hope it help you too. Kind regards, Amin Jahanbin

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