Assignment 2

# Assignment 2 - Mech Eng 2W04 2014 Thermodynamics ASSIGNMENT...

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Mech. Eng. 2W04, 2014 Thermodynamics Page 1 of 2 ASSIGNMENT # 2 ENERGY CONVERSION Due Monday, Jan. 27 th , 2014 before 4:00 pm (Drop box # 4 in JHE-307) General instructions: a. This assignment will be worked on through the tutorials of Jan. 22 & 24. (Be prepared) b. Choose one of your peers to be your partner for this assignment, c. Solve the assignment together or solve it separately and check the results with each other, d. Submit just one answer sheet having both of your names, e. The same mark will be given to each one of you. 1. An oil pump is drawing 35 kW of electric power while pumping oil with ρ = 860 kg/m 3 at a rate of 0.1 m 3 /s. The inlet and outlet diameters of the pipe are 8 cm and 12cm, respectively. If the pressure rise of oil in the pump is measured to be 400 kPa and the motor efficiency is 90 percent, determine the mechanical efficiency of the pump. 2. Estimate the electrical power output for a windmill of 10-m diameter if the wind velocity is 8 m/s and the air density is 1.2 kg/m 3 . The mechanical and generator efficiencies are 35% and 85%, respectively.

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