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As shown in Figure below, at steady state, R22 enters the evaporator at state 1 at 140 kPa, 5.5g/s and exits at 10C. Water enters
As shown in Figure below, at steady state, R22 enters the evaporator at state 1 at 140 kPa, 5.5g/s and exits at 10C. Water enters the heat exchanger at state 3 at 100C and 100kPa and exits at state 4 as a saturated liquid at 100kPa. For each case, find the mass flow rate of water in g/s required to achieve the refrigerant outlet temperature of 10C. Assume that pressure on both sides of the heat exchanger is constant, all heat from the water is transferred to the refrigerant, and neglect changes in kinetic and potential energy. a. R22 enters with an inlet quality of 100%. (10 Points) b. R22 enters with an inlet quality of 0%. (10 Points) c. Draw Pv diagram for the water from state 3 to state 4, including isotherms. (5 Points) d. Comment on whether it is necessary to find the heat transfer rate between water and R22 in order to find the mass flow rate of water. Hint: think of what system boundaries you can use. (5 Points) e. Determine specific entropies of water at states 3 and 4 and draw T-s diagram for part (a). (5 Points)
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