A hydro-storage plant uses a turbine-pump which has 22,000 kW rated output capacity, with a plant...

Transcribed Image Text:

A hydro-storage plant uses a turbine-pump which has 22,000 kW rated output capacity, with a plant use factor of 75%. For 1.5-hour peak, determine the hydraulic impoundment in cubic meter of water required. Friction loss in the penstock is 6% of gross head. Dam elevation is 120 ft, hydraulic turbine elevation is 40 ft and tail race elevation are 20 ft. Generator efficiency is 92%, evaporation loss at the impoundment is 20%. Over-all turbine efficiency is 78%. Working as a pump, the system returns the water to the dam. At this operation, the friction loss is 8%, pump efficiency is 76% and motor efficiency is 85%. Calculate the power required to return the water to the impoundment within 1.5 hrs. operation; (kW-hr). Compare the power generated by the system when working as a turbine against when working as a pump; (%). A hydro-storage plant uses a turbine-pump which has 22,000 kW rated output capacity, with a plant use factor of 75%. For 1.5-hour peak, determine the hydraulic impoundment in cubic meter of water required. Friction loss in the penstock is 6% of gross head. Dam elevation is 120 ft, hydraulic turbine elevation is 40 ft and tail race elevation are 20 ft. Generator efficiency is 92%, evaporation loss at the impoundment is 20%. Over-all turbine efficiency is 78%. Working as a pump, the system returns the water to the dam. At this operation, the friction loss is 8%, pump efficiency is 76% and motor efficiency is 85%. Calculate the power required to return the water to the impoundment within 1.5 hrs. operation; (kW-hr). Compare the power generated by the system when working as a turbine against when working as a pump; (%).