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Enzyme Inhibition

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Course: CHE312 HW #4: Secs.2.7 - 2.10 Due Date: Mon. 26/05/1431 H ======================================
1. Hot water in an open storage tank at 82.2°C is being pumped at the rate of 0.379 m3/min from the tank. The line from the storage tank to the pump suction is 6.1 m of 2-in. schedule 40 steel pipe and it contains three elbows. The discharge line after the pump is 61 m of 2-in. pipe and contains two elbows. The water discharges to the atmosphere at a height of 6.1 m above the water level in the storage tank.
(a) Calculate all frictional losses ΣF.
(b) Make a mechanical-energy balance and calculate Ws of the pump in J/kg.
(c) What is the kW power of the pump if its efficiency is 75%?
Ans. (a) ΣF = 122.8 J/kg; (b) Ws = -186.9 J/kg; (c) 1.527 kW

2. Nitrogen gas is flowing through a 4-in. schedule 40 commercial steel pipe at 298 K. The total flow rate is 7.40 X 10-2 kg/s and the flow can be assumed as isothermal. The pipe is 3000 m long and the inlet pressure is 200 kPa. Calculate the outlet pressure.
Ans. P2 = 188.5 kPa
3. Calculate the pressure at Al Soudah Mountain, taking into the account that air is compressible.
4. In a small domestic fish tank, a 5-watt pump at the top of the tank is used to pump water through a filter. The pump is sucking water from the bottom of the tank at a depth of 20 cm. The tank is 75% filled. The suction pipe size is 1 cm and the discharge pipe is 0.5 cm. the water temperature is 30 0C. Make reasonable assumptions for any missing data.
A) Draw a flow sheet for this system.
B) Calculate the volumetric flow rate of the pumped water.
Hint: A video clip of the fish tank is available at:
http://faculty.ksu.edu.sa/othman/CHE312/Fish

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