A Carnot refrigerator has tetrafluoroethane as the working fluid. The cycle is the same as that shown by Fig. 8.2, except the directions are reversed. For TC = 10°F and TH = 100°F, determine: (a) The pressures at states 1, 2, 3, and 4. Show detailed solutions.

(5)An insulated piston-cylinder device contains 15 L of saturated liquid water at a constant pressure of 950 kPa. Water is stirred by a paddle wheel while a current of 15 A flows for 28 min through a resistor placed in the water. If 64% of the liquid is evaporated during this constant pressure process and the paddle-wheel work amounts to 600 kJ, determine the voltage of the source. Also, show the process on a P-v diagram with respect to saturation lines. H,0 P= constant W. W.

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The work for irreversible compression of an ideal gas in a piston-cylinder system is the work for reversible compression to the same final pressure. a) higher than b) lower than c) the same as d) We need more information