A mechanical vapor compression refrigeration cycle operates with water as the working fluid. The compressor inlet is superheated steam at pressure p1 = 0.095 MPa and temperature T1 = 100◦C and leaves it at temperature T2 = 300◦C and pressure p2 = 0.4 MPa. the valve inlet expansion is saturated liquid. Neglecting heat exchanges and pressure drop in the lines between the components and assuming that the temperatures of the reservoirs are given by the values physically limiting, answer the items below: (a) Calculate the specific entropy and enthalpy of all points in the cycle;
A
(b) Calculate the heat absorbed (qL) and rejected (qH ) by the cycle, as well as the net work (all specific), and the COPR of the cycle;
(c) Calculate the specific entropy generated in processes 1-2, 2-3, and 3-4, as well as for the cycle whole; (d) Considering a modified version of the cycle, where the expansion valve is replaced by a reversible turbine, calculate new values for qL, wl i q , COPR and sgtot .
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