Re: [TRNSYS-users] gasflue losses Type 534

[David BRADLEY <d.bradley@tess-inc.com>]

Jan,

 The idea is that gas-fired water heaters sometimes have a chimney that runs from the burner up through the tank. When the burner is active then the air/exhaust in the chimney is hot and the water in the tank gains a little energy from the conduction/convection heat transfer from the chimney air to the water. When the burner is not active then the air in the chimney is not hot and there can be additional energy losses from the tank water to that air. The amount of loss is controlled by a parameter that asks what the u-value of the flue is and by the input that sets the temperature of the air/exhaust in the flue. If you want to deactivate those losses you can set the flue u-value to zero.

kind regards,

 David

On 2/2/2023 5:48 AM, Böttner, Jan via TRNSYS-users wrote:

Hi,

 

I’m using the storage tank type 534.

This tank has gasflue losses, which I don’t quite understand from reading the documentation.

But the way I understand it, it doesn’t apply for the tank I am modelling.

So I would like to deactivate these losses, as they make up for about 10% for my energy supply.

 

Best regards,

Jan

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David BRADLEY
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Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
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