13. During a load rejection in the power plant illustrated in the figure below. The elevation...
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13. During a load rejection in the power plant illustrated in the figure below. The elevation in the surge tank varied sinusoidally with a maximum rate of change of 9.55 m/s. ho h h L h3 The chief engineer has found data on the outlet tunnel area and the surge cavern area, being 75 m and 7.5 m respectively. Unfortunately the length of the outlet tunnel, L2, is unknown. But the outlet tunnel is made of spray lined concrete that has a friction factor of 0.012. In the spiral a maximum pressure of 56 bar was recorded during the load rejection. The stationary levels at the positions indicated by h was +280 masl, h was +130 masl, and he was +128 masl. Help the chief engineer to calculate: a) The flow of water during the load rejection. b) The power of the station before the load rejection happened. c) The length of the tunnel. (10p) 13. During a load rejection in the power plant illustrated in the figure below. The elevation in the surge tank varied sinusoidally with a maximum rate of change of 9.55 m/s. ho h h L h3 The chief engineer has found data on the outlet tunnel area and the surge cavern area, being 75 m and 7.5 m respectively. Unfortunately the length of the outlet tunnel, L2, is unknown. But the outlet tunnel is made of spray lined concrete that has a friction factor of 0.012. In the spiral a maximum pressure of 56 bar was recorded during the load rejection. The stationary levels at the positions indicated by h was +280 masl, h was +130 masl, and he was +128 masl. Help the chief engineer to calculate: a) The flow of water during the load rejection. b) The power of the station before the load rejection happened. c) The length of the tunnel. (10p)
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