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electrical demand

electrical demand
1. AIf the electrical demand is 1,600 kW and the power factor is 0.88, calculate the reactive power (kVAr) and supplied power (kVA).
2. If the supplied power is 1,000 kVA and electrical demand is 930 kW, calculate power factor and reactive power (kVAr).
3. 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
4. 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 Answer: 5. 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 Answer: 6. 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 Answer: 7. 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) Answer: 8. Determine the annual cost savings from consolidating the following two electrical services into a single service with one meter if E1 = 500,000 kWh/month, E2 = 400,000 kWh/month and the typical demand profiles are shown in the graphs below. 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 Answer: 9. A plant’s demand and power factor are 800 kW and 0.80 respectively for six months per year, and 700 kW and 0.85 respectively for the other six months per year. If demand costs $18 /kVA-month, determine the quantity of capacitance to maximize savings without over-correcting for power factor, and the annual savings from adding this quantity of capacitance. Answer: TO ORDER FOR THIS QUESTION OR A SIMILAR ONE, CLICK THE ORDER NOW BUTTON AND ON THE ORDER FORM, FILL ALL THE REQUIRED DETAILS THEN TRACE THE DISCOUNT CODE, TYPE IT ON THE DISCOUNT BOX AND CLICK ON ‘USE CODE’ TO EFFECT YOUR DISCOUNT. THANK YOU

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