CHE218_solutions5

# CHE218_solutions5 - Set 5 2008 4.6 System the water path...

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Unformatted text preview: Set 5 2008 4.6* System: the water path through the dam, from inlet to outlet., steady flow The initial and final velocities are essentially 0. Assume also the enthalpy does not change. Then, the only energy to be converted to work is potential energy. For 1 kg of water, with a drop of 750 feet, we can calculate the power (W hrs) that can be generated: gG¡¢£ ¤ u¥¦ U §¨© ª « ¬ U ­®¯° ±² U °¨³°´© ª ±² gG¡¢£ ¤ §¨© µ U ­¶¶©¨· ª ¤ ­¶¶´° µ U ª ¤ ­¶¶´° ¸ U « U ¹£ ³·°° « ¤ ­°¨·¶¶ ¸ U ¹£ Thus, gG¡¢£ ¥¦ ¡º²¢£ ¤ ­°¨·¶¶ ¸ ¹£ ¥¦ ¤ ­·¨¶¶ » u° ¼½ ¥¸ ¹£ ¥¦ This is negative because it is work flowing out of the system. 4.9* System; power plant, steady flow Note g¾ ¤ ¿ À U ÁÂ ÃÄ ÁÅ dW n.f. dm = g Δ z + Δ V 2 2 = 9.81 m s 2 ⋅ - 40 m ( ) + 15 m s 2- 9 m s 2 2...
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