A control system will determine when the valve opens. It will only be open when a change in power is desired and its position is again determined by the control system.
Thank you zekeman. I think the answer I was looking for is applying the momentum equation and solve for pressure at (3). However, I do not understand why your equation is as follows:
p1*A1+M1*V1=(M1+M2)*V3+p3*A3
Shouldn't the equation be:
p1*A1+M1*V1 + p2*A2 +M2*V2 =(M1+M2)*V3+p3*A3
Since...
Your second point mjpetrag is referring to the fact that the turbine pressure ratio will change when opening the bypass line and thus change the turbine exit pressure? Correct?
This is useful information, however, I still do not know what the pressure at point (3) should be (my original...
Perhaps I should just attach a figure to help explain the problem.
Zekeman I am not increasing the flow rate by 50%, I am simply rerouting it through pipe 2.
My outlet pressure from pipe 3 is known at the initial point in time before the valve at point 2 is opened (80 bar). I understand that...
Alright, I think I should provide more information and just define the entire problem. The fluid is carbon dioxide. Point (1) represents fluid exiting a turbine at about 80 bar and 800 K, 36 m/s. At normal conditions, point (2) will be shut off from this system by a valve at both ends of the...
I should mention that I am not interested in the pressure at the mixing point, but rather the pressure at point (3) should be sufficiently downstream from the mixing point.
I also forgot to mention that the amount of fluid entering point (2) is relatively small in comparison to point (1). The...
My problem is that my valve requires very high performance (Temperature of 750 deg. C and Pressure of 220 bar), and Emerson cannot manufacture such a valve. However, I still want to use their compressible flow equation since I have not found any other equation for modelling the pressure drop...
Sorry, for the confusion. I should have provided more information. The fluid is not air so psychrometry cannot be used. Fluid at point (1), (2) and (3) in the schematic below are all the same, but at different temperatures and pressures. The fluid enters at points (1) and (2) and exits at point...
Hello,
I am trying to compute the pressure drop across a 20 inch butterfly valve at various valve positions for throttling a supercritical carbon dioxide stream in a pipe. I found an equation for calculating the pressure drop for compressible fluids across valves in an Emerson manual (the...
Hello,
I am mixing two streams of the same fluid at different temperatures and pressures in a pipe. I am trying to calculate the pressure at the new point where the two streams mix. I know that I must use conservation of mass and energy to determine the enthalpy at the new point, but, I do...
