Recent content by Sara1

Isentropic Efficiency= Measures the deviation of actual processes from the corresponding isentropic ones. Thus, for a nozzle: 0.83= Actual Kinetic Energy at Nozzle Exit/ Isentropic KE at Nozzle Exit

Homework Statement CO2 gas enters a nozzle with an isentropic efficiency of 83% with a low velocity. It exits the nozzle at 110 kpa and 59K and 246m/s. Determine the pressure at the nozzle inlet assuming: Homework Equations -Constant specific heats at room temperature -Variable specific...

I figured out how to solve it as well. Since the process is reversible, then the piston is adiabatic, then the process is isentropic. Thus, s1=s2. We can Find the work using the equation -W=m(U2-U1) The u1 is determined from state one from the given information. To find U2, we must realize that...

Oh, so shall i use the equation Q=m*cv*(T2-T1) instead? The t1 is given and i can find the t2 from the pressure=900kpa

Won't the final pressure be 900?

why will the volume be equal to zero?

How do i use the latent heat to find the work? Do i calculate to find the h or perhaps find the specific volume then multiply by the mass to find the volume. then i can use the equation of work which is: w=p(v2-v1)

Homework Statement An insulated piston-cylinder device contains 5 kg of water at 100oC with a quarter of the mass is vapor. The water is compressed reversibly to 900 kPa. Find the work done during this process. Let the ambient temperature to be 27oC. Homework Equations I can use the...

Thank you

Consider a heat pump works on the vapor-compression refrigeration cycle with 0.2 kg/s of refrigerant-134a as the working fluid. The cycle is used to maintain a house at 26oC while absorbing heat from the outdoors at 3oC. R-134a enters the compressor at 200 kPa as a saturated vapor and leaves at...