Design the condenser of a steam  power plant that has a thermal efficiency of 40 percent and generates 10  MW of net electric power. Steam enters the condenser as saturated vapor  at 10 kPa, and it is to be condensed outside horizontal tubes through  which cooling water from a nearby river flows. The temperature rise of  the cooling water is limited to 8 degree C, and the velocity of the  cooling water in the pipes is limited to 6 m/s to keep the pressure drop  at an acceptable level. From prior experience, the average heat flux  based on the outer surface of the tubes can be taken to be 12,000 W/m^2.  Specify the pipe diameter, total pipe length, and the arrangement of  the pipes to minimize the condenser volume.