The heat removed from a condenser of a refrigeration plant is rejected to the atmosphere using two identical cooling towers as shown in Fig. P XXXXXXXXXXThe temperature rise of the cooling water in...

The heat removed from a condenser of a refrigeration plant is rejected to the atmosphere using two identical cooling towers as shown in Fig. P12.9.1. The temperature rise of the cooling water in the condenser is 6°C and the heat removal rate is 176 kW. The total length of pipe from 5 to 2 through the pump is 22 m, and the total length of pipe from 2 to 5 through the cooling tower is 8 m. The spray nozzles of the cooling towers are 4 m above the water surface in the sumps. The head loss through the condenser is 3.2 m of water.

Based on the required water flow rate through the condenser, the diameter of the pipe 5-2 through the pump has been selected as 75 mm and the diameter of pipe from 2-5 through the cooling tower has been selected as 60 mm. (a) Check whether the selected pipe diameters satisfy the guidelines listed in section 12.6.2. (b) Calculate the required rise of total head across the pump. (c) If the efficiency of the pump is 65%, calculate the power input.