Respuesta :
r-134a at 100 lbf/in2, 200 f enters a valve operating at steady state and undergoes a throttle process energy distraction is 6.885 Btu/lb
energy distraction =T*ΔS
=529.67(S1-S2)
=529.67(0.281-0.268)
=6.885 btu/lb
A process is considered to be throttling if there is no enthalpy change from state one to state two, or h1 = h2, no work is performed, or W = 0, and the process is adiabatic, or Q = 0. By adjusting how much fuel or air is injected into an internal combustion engine, the throttle can be used to modify the engine's output. The throttle, accelerator, or gas pedal are all terms used to describe the driver's control in a motor vehicle for adjusting power. A pump system's flow rate can be affected by changing the system resistance through control by throttling. Because it makes use of already-installed, upstream valves inside centrifugal pumps, this method is also the simplest for changing their operating point.
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