[deyouja]

I need to calculate the amount of power needed in a heat exchanger to make up for heat loss due to high pressure gas expanding across a valve at a constant flow rate, and a constant pressure upstream of the valve (p1) and down-stream of the valve (p2), P2 is constant due to a back pressure regulator down stream of the valve.  I am only interested in the heat loss due to the primary expansion (2850 --> 400)  The volumes upstream of the valve and down stream of the valve are not changing as the gas is being fed at a constant rate from an infinite supply source. 

The gas is CO2, p1 =2850 psi, p2 = 400 psi, T1=40C.  I would like to keep the down stream temperature at 25C.     

[eugenedakin]

Hello deyouja,

The forums rules mention that I cannot do the work for you. I can only help you figure out the answer.

Could you provide your initial calculations? I am sure that someone will be able to help steer you in the right direction.

Best wishes, and thanks for your help,

Eugene

[deyouja]

Eugene,
No calculations done yet.  I am looking for an equation that accounts for the heat loss taking place at the throttle point (valve) when the upstream and downstream pressures do not change (constant feed, and a back pressure regulator downstream of the throttle).  Thanks..