(Solved):   Problem\#2 The net power output of an ideal reheat regenerative steam cycle is \( 80 \math ...

 

Problem\#2 The net power output of an ideal reheat regenerative steam cycle is \( 80 \mathrm{MW} \). Steam enters the h.p. turbine at \( 80 \mathrm{bar}, 500^{\circ} \mathrm{C} \) and expands till it becomes saturated vapor. Some of the steam then goes to an open feedwater heater and the balance is reheated to \( 400^{\circ} \mathrm{C} \), after which it expands in an I.p. turbine to \( 0.07 \) bar. Compute (a) the reheat pressure, (b) the steam flow rate to the h.p. turbine, \( \begin{array}{ll}\text { (c) the cycle efficiency, and } & \text { (d) the rate of flow of cooling water in the condenser if the }\end{array} \) temperature rise of water is \( 8^{\circ} \mathrm{C} \), (e) If the velocity of steam flowing from the turbine to the condenser is limited to \( 130 \mathrm{~m} / \mathrm{s} \), find the diameter of the connecting pipe. [Ans. (a) \( 6.5 \mathrm{bar} \), (b) \( 58.4 \mathrm{~kg} / \mathrm{s} \), (c) \( 43.7 \% \) (d) \( 3146.5 \mathrm{~kg} / \mathrm{s} \), (e) \( 2.97 \mathrm{~m}] \)