FA2019 Exam 3 Sample.pdf - Sample Test#3 CHBE 221 1(25 pts The manager of a power plant is looking for a way to store excess energy produced in off peak

FA2019 Exam 3 Sample.pdf - Sample Test#3 CHBE 221 1(25 pts...

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CHBE 221 Sample Test #3 1 (25 pts) The manager of a power plant is looking for a way to store excess energy produced in off peak hours. He decides to pump water from a lake into a hollowed out cavern at an elevation 100 m above the lake. The water enters the pipeline through a large inlet at the surface of the lake and discharges into the cavern through a pipe 30 cm in diameter. The fluid exit velocity is 25 m/s which gives a volume flow rate of 1.77 𝑚 /𝑠 . Calculate the power consumption of the pumps in MW. Density of water 𝜌 ൌ 1000 𝑘𝑔/𝑚 1 Watt ൌ 1 Joule/s 2 (35 pts) As the technical consultant for a retrofit project in Houston, you have been asked to assess the performance of an existing cooling system to meet new needs. The outside air must be cooled and dehumidified to provide 15,000 𝑐𝑓𝑚 ሺ𝑓𝑡 / min ሻ of air at conditions of 70 °F and 40% relative humidity. The system consists of two units - a cooling unit which cools and dehumidifies the air and a reheater which warms the air back up to the delivery temperature. The cooling
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