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Buy Electrical Engineering Assignment Buy Electrical Engineering Assignment 1. A 95%-efficient 100-hp motor runs 6,000 hours per year and produces power for a fan that requires 80 hp of shaft work. A) Calculate the annual operating cost of the motor if the pulleys use 90%-efficient standard V-belts B) Calculate the annual operating cost of the motor if the pulleys use 95%-efficient notched V-belts. C) Calculate the annual electricity cost savings from switching from standard to notched V- belts. 2. A 20-hp motor runs 5,000 hours per year, produces 5 hp of shaft work, and operates at 60% efficiency with a power factor of 75%. A) Calculate the power (kW), energy (kWh) and reactive power (kVAr) produced by the motor. B) If motor were replaced with an energy efficient 5-hp motor operating at 90% efficiency with a power factor of 90%, calculate the power (kW), energy (kWh) and reactive power (kVAr) produced by the “right-sized” motor. C) Calculate the power, energy, power factor and total cost savings from rightsizing the motor. 3. A company has 2,000 4-foot, 4-lamp fixtures with 34-W T12 lamps and electromagnetic ballasts. The lights are on an average of 75 hours per week for 50 weeks per year. It is proposed to replace the current T12 lamps with 32-W T8 long-life low mercury lamps and to replace the current magnetic ballasts with normal output electronic ballasts. The time required to replace of old lamps is 0.25 hours/fixture. The time required to install new lamps and ballasts is 0.50 hours/fixture. Fill in the shaded areas in the table below. Buy Electrical Engineering Assignment 4. If the electrical demand is 1,000 kW and electrical energy use is 250,000 kWh, calculate the adjustment to the avoided cost of demand for the following energy use block structure: Energy: $0.04 /kWh for the first 200 kWh/kW $0.03 /kWh for the next 100 kWh/kW $0.02 /kWh for all additional kWh 5. Use the following rate structure to calculate the monthly service charge, energy charge, demand charge, power factor charge and total charge for a plant if E = 600,000 kWh, D = 900 kW, PF = 0.85. Determine the fraction of the total cost associated with each charge. Service: $100 / month Energy: $0.04 /kWh for the first 200 kWh/kW $0.03 /kWh for next 100 kWh/kW $0.02 /kWh for all additional kWh Demand: $12 /kW-month Power factor: If PF < 0.90, additional demand charge of: P (kW) (0.90 – PF) / PF 6. Use the following rate structure to calculate the monthly service charge, energy charge, demand charge and total charge for a plant if E = 500,000 kWh, D = 1,000 kW, PF = 0.92. What would be the demand charge if the power factor was 1.00? Service: $100 /month Energy: $0.03 /kWh for first 250 kWh/kVA $0.01 /kWh for all additional kWh Demand: $18 /kVA-month for first 4,000 kVA: $14 /kVA-month for all additional kVA Buy Electrical Engineering Assignment 7. Calculate the annual cost savings if a customer purchases the transformer and switches from a secondary to primary rate if E = 500,000 kWh/month, D = 1,200 kW. If the transformer could be purchased for $20,000, determine the simple payback. Primary Rate Service: $95 /month Demand: $13.80 /kW-month Energy: $0.021 /kWh Secondary Rate Service: $16 /month Demand: $14.10 /kW-month Energy: $0.030 /kWh for first 125,000 kWh $0.025 /kWh for over 125,000 kWh 8. Plant demand during each of three shifts per day and the on-peak and off-peak demand periods are shown below. Using the following rate structure, determine annual demand cost savings if: a) 500 kW is moved from first shift to third shift, and b) if 1,200 kW is moved from first shift to third shift. Demand: $14 /kW-month Greatest of: 100% of on-peak (weekdays: 7 am to 9 pm) 75% of off-peak (all other times) 9. The surface temperature of 200 ft of 8-inch diameter un-insulated pipe carrying steam at 335 F is 250 F. The pipe is located in a room with air and surroundings at 50 F. The surface emissivity of the pipe is 0.70. Calculate convection, radiation and total heat loss from the pipe (Btu/hr). The pipe is insulated with 3 inches on insulation with thermal resistance R = 2 hr-ft2-F/Btu per inch. The surface emissivity of the insulation is 0.70. Calculate convection, radiation and total heat loss from the insulated pipe (Btu/hr). Calculate the heat loss and fuel savings from insulating the pipe (Btu/hr) if the efficiency of the steam system is 65%. 10. The surface temperature of a steam-heated, un-insulated rectangular tank with four walls with height 6 ft and length 10 ft is 170 F. The temperature of fluid in the tank is 190 F, and the temperature of the air and surroundings is 70 F. The surface emissivity of the tank is 0.70. Calculate convection, radiation and total heat loss from the tank walls (Btu/hr). The tank walls are insulated with 1 inch on insulation with thermal resistance R = 5 hr-ft2-F/Btu per inch. The surface emissivity of the insulation is 0.70. Calculate convection, radiation and total heat loss from the insulated tank walls (Btu/hr). Calculate the heat loss and fuel savings from insulating the tank walls (Btu/hr) if the efficiency of the steam system is 80%. 11. A pump pumps water through a closed loop piping system to 10 machines. Only 7 machines are operated at any one time. Excess flow is directed through a by-pass valve. The 40-hp pump motor is 90% efficiency and 75% loaded when the pump generates full flow. A) If the pump operates 7,000 hours per year, calculate annual electricity use (kWh/yr). B) Using pump affinity laws, calculate the annual electricity savings (kWh/yr) if the by-pass valve were closed and a VFD were installed on the pump motor. 12. Consider for the following table of major electricity-using equipment, rated output power, fraction loaded, and operating hours.

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