Chapter 11, Problem 3P

2. Consider the system described in the news: at night, when there is energy left, water is pumped from a large lake to a reservoir at 80 m above the lake level. During the day, this water is used to generate energy in a turbine located 80 m below the elevated reservoir. Considering that the water flow is always 5000 liters/s (both at the inlet of the reservoir and at the outlet) and that the pump and turbine efficiencies are 70%, what is the power (in kW) required by the pump and the power (in kW) recovered in the turbine. Data: The pipe diameter is always the same along the system (d = 0.5 m); g = 10 m/s2; γ = 9810 N/m3. Matter transport phenomena; Please make it typeable as handwriting interferes with understanding

A dam is shaped like a parabola (y = x^2) and has a height of 150 meters. The water's density is 1000kg/m3. Pt 1. FInd the total energy stored by this dam. Pt 2. If fourty-percent of the total energy from the dam was consumed, what would be the water level's new hight? Pt 3. If a city was using this dam for its energy and consumed 12 x 107 MW of power, how much time would it take for the level of the dam to drop down to the height in part 2?

A turbine is rated at 600hp when the flow of water through it is 82cu.m/sec. Assuming an efficiency of 92%, what is the head acting on the turbine?