Can somebody help me on problem 7 please If the process in problem 4 is reversib

Question

Can somebody help me on problem 7 please

If the process in problem 4 is reversible and also the temperature varies linearly with entropy (i.e., T = T(S) is linear) during the process, then Determine the heat transfer. That is find, Q2 in KJoules. Hint: Consider a T-S diagram of the process. Repeat Problem 4 except you must now use variable specific heats and the "table" method. A real adiabatic pump requires = - 1.25 KJ/kg specific work input to create a pressure rise from 100 KPa on in Flow to 1100 KPa on outflow, and has an isentropic efficiency, mp = 0.80 (80%) Determine in KJ/Kg, which is the ideal, reversible adiabatic (iseutropic) specific work. (You must give the correct sign, + or - for your result.) Assuming constant density of the liquid in Problem 7, determine the specific volume, in m3/kg. A certain SSSF turbine (irreversible and adiabatic) operate on air with the following conditions: Inflow: Ti = 900K; Pi = 6144.44824 KPa Outflow: Determine the specific work output of the turbine, , in KJ/kg. (Single Inflow/outflow, neglect Delta KE/Delta PE) Note: You are required to assume constant specific heats in this problem, where Cpo = 1.004 KJ/(kg middot degree k); k = Cpo/Cro = 1.4

Explanation / Answer

Efficiency = real work of the Pump/Ideal work of the pupm

Ideal work of hte pump = 0.8*(-1.25) = -1 KJ/kg

Real work required is more than the Ideal case because of the reversibilities

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