The power extracted from the fluid by the turbine (points 1 and 2 are as shown in the figure: z1=35 m and z2=0 m). (b) The useful power delivered to the fluid by the pump (points 1 and 2 in the figure should be reversed: z1=0 m and z2=35 m).
A pump-turbine is a piece of equipment that can operate either as a pump or as a turbine, depending on the direction of the water flow. The picture on the right shows a pump-turbine system.
When it is daytime, this system is used as a turbine, taking water from the upper reservoir and discharging it into the lower reservoir, producing electricity. When it is nighttime, electricity is cheaper, and this system is used as a pump, taking water from the lower reservoir and discharging it into the higher reservoir, so that it can produce electricity again the next day when it is used as a turbine. Consider that, using the system as a turbine or pump, the water flow is 1m3/s and the pressure drop is 5 m, determine:
(a) The power extracted from the fluid by the turbine (points 1 and 2 are as shown in the figure: z1=35 m and z2=0 m).
(b) The useful power delivered to the fluid by the pump (points 1 and 2 in the figure should be reversed: z1=0 m and z2=35 m).
![- Z, = 35 m
Água a 20°C
Bomba-turbina
- Z,=0 m](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8855b986-25a2-4dc3-ad13-3129c1c76b74%2F8e6a9558-8976-4437-a95f-68138e7ade4d%2Feiygfew_processed.png&w=3840&q=75)
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