Chapter 7, Problem 7.32P

A certain SSSF turbine (irreversible and adiabatic) operates on air with the following conditions, Inflow: Ti=1000 K, Pi = 13223.07354 kPa Outflow (actual): Te = 402.3904382 K Find the actual specific work output of the turbine, wt in KJ/kg. (Assume single inflow/outflow, neglect change in KE and PE. Assume constant specific heats in this problem, with Cp0 =1.004 kJ/(K*kg) and k= 1.4. Next if the hypothetical ideal, reversible adiabatic (isentropic) specific work output of the turbine is wt= +800 Kj/kg: Find the isentropic efficiency of the turbine, outflow pressure Pe in kPa and finally what is the ratio of the outflow pressure of the actual turbine to the same pressure for the ideal turbine.

2. If 0.17 kg/s of air are compressed isothermally from Pi = 96 kPaa and V, = 0.13 m/s to p2 = 620 kPaa, find the work, the change of entropy, and heat for: a) a nonflow process, and b) a steady flow process with V1 = 15 m/s and V2 = 60 %3D %3D m/s.

5.49 Air in a piston/cylinder goes through a Carnot cycle with the P-v diagram shown in Fig. 5.21. The high and low temperatures are 600 K and 300 K, respectively. The heat added at the high temperature is 250 kJ/kg, and the lowest pressure in the cycle is 75 kPa. Find the specific volume and pressure after heat rejection and the net work per unit mass.