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[EnergyPlus_Support] Heat transfer outputs interpretation

Hello,

Looking to surface outputs, I don't understand how heat flux is calculated. I probably miss something.

My surface is one layer material, material set as resistance only R=1.
Its area is 82.7 m2.

After a winter design day calculation, my outputs give me:
Heat flux : 1364 W
Coeff convection int (Uc int) : 3.076 W/(m2.K)
Coeff convection out (Uc out) : 8.23 W/(m2.K)
Outside temperature (t out) : -6.2°C
Internal temperature (t int): 22°C

When applying this formula : Heat = 1/(R + 1/Uc int + 1/Uc out)*(t int - t out)* area, I found 1612 W.

Where am I wrong?

Thanks.



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