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Heat transfer in HVAC

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Old   August 29, 2016, 03:47
Default Heat transfer in HVAC
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Alex Gtz
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Hello,
I am stuck with a simple problem. I am modeling airflows and heat transfer in an entrance hall with a window-wall. Thus convection and radiation is implemented. Velocity-inlet is set to 9 m/s. Simulation is made with an outside temperature of 5°C and 20°C inside.

When I want to simulate a new configuration with a velocity-inlet of 4.5 m/s then the temperature in the fluid-domain rises to 23°C. I expected the temperature to drop, as less hot air is coming in.

The only explanation I though viable is that the velocity in the domain drops, therefore there is less convection on the wall, meaning less cold coming from the outside. But I don't think this represents well the reality.

Any help is much aprecieted.

Cheers. Alex.
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Old   August 29, 2016, 05:45
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Mustafa
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Dear Alex
This may help
http://adf.ly/1dWqsi
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Old   August 29, 2016, 05:48
Default Doesn't solve it
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Alex Gtz
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Quote:
Originally Posted by Mohawk View Post
Dear Alex
This may help
http://adf.ly/1dWqsi
Hi,
Thank you but I already know this tutorial and it doesn't solve the problem...
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