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An 85% efficient compressor is driven by a 92% efficient electric motor. The compressor delivers 760...
A centrifugal compressor with a power consumption of 18 kW per 100 cubic feet per minute...
A centrifugal compressor with a power consumption of 18 kW per 100 cubic feet per minute (cfm) delivers 1000 cfm to a plant air supply. The compressor operates 2080 hour annually. Determine the annual operating cost of the compressor if the annual demand charge is $100/kW-year and the electric energy charge is 0.065 $/kWh.
A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is...
A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is $2,200. A second 30-horsepower high-efficiency motor can be purchased for $3,200, and its efficiency is 92%. Either motor will be operated 4,000 hours per year at full load, and electricity costs $0.10 per kilowatt-hour (kWh). MARR = 12% per year, and neither motor will have a market value at the end of the eight-year study period. a. Which motor should be chosen? b. For...
Problem 6-16 (algorithmic) Question Help A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its...
Problem 6-16 (algorithmic) Question Help A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is $2,100. A second 30-horsepower high-efficiency motor can be purchased for $3,100, and its efficiency is 94%. Either motor will be operated 3,500 hours per year at full load, and electricity costs $0.09 per kilowatt-hour (kWh). MARR = 12% per year, and neither motor will have a market value at the end of the eight-year study period a. Which motor...
Solve 2.14 2.14 Two electric motors are available to satisfy a continuous demand of 85 kW....
Solve 2.14
2.14 Two electric motors are available to satisfy a continuous demand of 85 kW. Motor I has an initial cost of S5,500 with an operating efficiency of 91%. Motor 2 has an initial cost of $4,000 with an operating efficiency of 89%. Each motor has a life of 10 years with no salvage value. The annual cost of electricity to run the machines is $19.20 per kW of demand plus $0.12 per kWh of energy use. Determine the...
Air stored underground at 500 psia and 200 deg.F is first heated by natural gas combustion...
Air stored underground at 500 psia and 200 deg.F is first heated by natural gas combustion to 2,340 deg.F at constant pressure, then expanded in an 89% efficient turbine to atmospheric (14.7 psia) pressure. Part of the work of the turbine is used to compress ambient air at 70 deg.F and 14.7 psia to store it underground with an 85% efficient compressor. The air that is stored underground loses heat to the surroundings. The turbine powers an electric generator that...
number 2 PW, AW An electric motor is rated at 10 horsepower (HP) and costs $800....
number 2
PW, AW An electric motor is rated at 10 horsepower (HP) and costs $800. Its full-load efficiency is specified to be 85%. A newly designed, high-efficiency motor of the same size has an efficiency of 90%, but costs $1,200. It is estimated that the motors will operate at a rated 10-HP output for 1,500 hours a year, and the cost of energy will be $0.07 per kilowatt-hour. Each motor is expected to have a 15-year life. At the...
Problem 6-30 (algorithmic) Question Help * Two electric motors are being considered to drive a ce...
Problem 6-30 (algorithmic) Question Help * Two electric motors are being considered to drive a centrifugal pump. Each motor is capable of delivering 100 horsepower (output) to the pumping operation. It is expected that the motors will be in use 2,500 hours per year and the MARR-8% per year. (1 hp 0.746 kW) a. If electricity costs SX per kilowatt-hour, calculate the annual cost of electrical power for each motor b. What cost of electricity (S/kWh) makes the two pumps...
For the following problems assume the cost of electrical demand is $14 /kW-mo, the cost of...
For the following problems assume the cost of electrical demand is $14 /kW-mo, the cost of electrical energy is $0.02/kWh and the power factor charge is $0.60/kVAr-month 3) The measured current, voltage and power factor of a premium-efficient, three- phase, 125-hp air compressor motor are shown in the table below. Assume motor is 95.3% efficient at all loads. Loaded 127 476 92 Unloaded 63 476 .81 Current (Amps) Voltage (Volts) Power Factor (kw/kvA) A) Calculate the power draw of the...
A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is...
A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is $2.200 A second 30-horsepower high-efficiency motor can be purchased for $3,200, and its efficiency is 93%. Either motor will be operated 4,000 hours per year at full load, and electricity costs $0.10 per kilowatt-hour (kWh). MARR= 15% per year, and neither motor will have a market value at the end of the eight-year study period. Most motors are operated at a fraction of their...
4 & 5 please thumbs up kW 60 Hz 24 Hz frequency converter 12 7 kW...
4
& 5 please thumbs up
kW 60 Hz 24 Hz frequency converter 12 7 kW kW P P 3 kW rotor Par kW stator 120 11 (1- kw 9.55 P Tm [MF1 Figure 2 Power distribution for the wind turbine 4. MF2) A 93 % -efficient 100-hp motor runs 6,000 hours per year and produces power for a fan that requires 75 hp of shaft work. ($0.1/kWh flat rate) Calculate the annual operating cost of the motor if the...
A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is $2,200. A second 30-horsepower high-efficiency motor can be purchased for $3,200, and its efficiency is 92%. Either motor will be operated 4,000 hours per year at full load, and electricity costs $0.10 per kilowatt-hour (kWh). MARR = 12% per year, and neither motor will have a market value at the end of the eight-year study period. a. Which motor should be chosen? b. For...
Problem 6-16 (algorithmic) Question Help A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is $2,100. A second 30-horsepower high-efficiency motor can be purchased for $3,100, and its efficiency is 94%. Either motor will be operated 3,500 hours per year at full load, and electricity costs $0.09 per kilowatt-hour (kWh). MARR = 12% per year, and neither motor will have a market value at the end of the eight-year study period a. Which motor...
Solve 2.14
2.14 Two electric motors are available to satisfy a continuous demand of 85 kW. Motor I has an initial cost of S5,500 with an operating efficiency of 91%. Motor 2 has an initial cost of $4,000 with an operating efficiency of 89%. Each motor has a life of 10 years with no salvage value. The annual cost of electricity to run the machines is $19.20 per kW of demand plus $0.12 per kWh of energy use. Determine the...
number 2
PW, AW An electric motor is rated at 10 horsepower (HP) and costs $800. Its full-load efficiency is specified to be 85%. A newly designed, high-efficiency motor of the same size has an efficiency of 90%, but costs $1,200. It is estimated that the motors will operate at a rated 10-HP output for 1,500 hours a year, and the cost of energy will be $0.07 per kilowatt-hour. Each motor is expected to have a 15-year life. At the...
Problem 6-30 (algorithmic) Question Help * Two electric motors are being considered to drive a centrifugal pump. Each motor is capable of delivering 100 horsepower (output) to the pumping operation. It is expected that the motors will be in use 2,500 hours per year and the MARR-8% per year. (1 hp 0.746 kW) a. If electricity costs SX per kilowatt-hour, calculate the annual cost of electrical power for each motor b. What cost of electricity (S/kWh) makes the two pumps...
For the following problems assume the cost of electrical demand is $14 /kW-mo, the cost of electrical energy is $0.02/kWh and the power factor charge is $0.60/kVAr-month 3) The measured current, voltage and power factor of a premium-efficient, three- phase, 125-hp air compressor motor are shown in the table below. Assume motor is 95.3% efficient at all loads. Loaded 127 476 92 Unloaded 63 476 .81 Current (Amps) Voltage (Volts) Power Factor (kw/kvA) A) Calculate the power draw of the...
A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is $2.200 A second 30-horsepower high-efficiency motor can be purchased for $3,200, and its efficiency is 93%. Either motor will be operated 4,000 hours per year at full load, and electricity costs $0.10 per kilowatt-hour (kWh). MARR= 15% per year, and neither motor will have a market value at the end of the eight-year study period. Most motors are operated at a fraction of their...
4
& 5 please thumbs up
kW 60 Hz 24 Hz frequency converter 12 7 kW kW P P 3 kW rotor Par kW stator 120 11 (1- kw 9.55 P Tm [MF1 Figure 2 Power distribution for the wind turbine 4. MF2) A 93 % -efficient 100-hp motor runs 6,000 hours per year and produces power for a fan that requires 75 hp of shaft work. ($0.1/kWh flat rate) Calculate the annual operating cost of the motor if the...
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