7.4 PQ1 Apply the grid method to each situation. a. Calculate the energy in joules used by a 1 hp pump that is op- erating for 6 hours. Also, calculate the cost of electricity for this time period. Assume that electricity costs $0.15 per kW-hr. b. Amotor is being to used to turn the shaft of a centrifugal pump. Apply Eq. (7.2b) to calculate the power in watts corresponding to a torque of 100 Ibf-in and a rotation speed of 850 rpm. c. A turbine produces a power of 7500 ft-lbf/s. Calculate the power in hp and in watts.
7.4 PQ1 Apply the grid method to each situation. a. Calculate the energy in joules used by a 1 hp pump that is op- erating for 6 hours. Also, calculate the cost of electricity for this time period. Assume that electricity costs $0.15 per kW-hr. b. Amotor is being to used to turn the shaft of a centrifugal pump. Apply Eq. (7.2b) to calculate the power in watts corresponding to a torque of 100 Ibf-in and a rotation speed of 850 rpm. c. A turbine produces a power of 7500 ft-lbf/s. Calculate the power in hp and in watts.
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Equation 7.2b is attached.
Answer should (a) cost $0.67, (b) P 1010 W, (c) P 13.6 hp
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Transcribed Image Text:TAO
P = lim
At→0 At
(7.2b)
%3D
Transcribed Image Text:7.4 PQ1 Apply the grid method to each situation.
a. Calculate the energy in joules used by a 1 hp pump that is op-
erating for 6 hours. Also, calculate the cost of electricity for this
time period. Assume that electricity costs $0.15 per kW-hr.
b. Amotor is being to used to turn the shaft of a centrifugal pump.
Apply Eq. (7.2b) to calculate the power in watts corresponding
to a torque of 100 Ibf-in and a rotation speed of 850 rpm.
c. A turbine produces a power of 7500 ft-lbf/s. Calculate the
power in hp and in watts.
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