Reply To: How the heat fluxes for inlets/outlets in Fluent are calculated

[Karthik Remella]

Hello,

To estimate the total heat transfer rate at the inlet and outlet, please go to 'Surface Integrals', choose 'Flow Rate' for the 'Report Type', select 'Enthalpy' (in the Temperature category), and select your inlet and outlet surfaces over which you would like to integrate. 

The total Q reported by Fluent crossing the inlet and outlet is the surface integral of 

[enthalpy x density x velocity vector x dA]

For additional details, please have a look at the following link (Fluent Users Guide: Section 14.2.3.4. Reporting Heat Transfer Through a Surface) - https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/flu_ug/flu_ug_sec_hxfer_report.html%23x1-110100014.4.1

Specific enthalpy is calculated based on the temperature as well as the reference temperature. 

For additional information, look at 'The Energy Equation' in the Fluent Theory guide (Section 5.2.1.1) using the following link: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/flu_th/flu_th_sec_hxfer_theory.html

I hope this helps.

Best,

Karthik