Hello,
I am attempting to do a hand calculation of the following scenario.
Scenario:
Fire impinging on an unwetted vessel and in this case the PSV and other outlets are blocked. I would like to calculate the pressure rise of the fluid in the vessel. Assuming ideal gas law, I will first need the temperature rise of the fluid in the vessel during the fire duration.
So far, I have the flame properties from API 521. With this information, I am able to get the net heat gain by the vessel; i.e.
Q total = Q convection + Q radiation
And so the temperature vessel temperature rise can be computed with: ΔT = [Δt(QR + QC)]/CSρSWS
Having this new vessel surface temperature, how do I proceed to calculate the heat transfer to the gas in the vessel to get the new temperature?
I've tried Q = hc (T surface - T in)
But my Tin seems to be very high which does not make sense.