Problem 2 In working with a chemical plant in Stillwater Oklahoma, Energy Auditor (EA) find five large exhaust fans running constantly to exhaust general plant air. They are each powered by 30-HP electric motors with efficiency of 91.75% and power factor of 0.86 lagging. The fans operate 24 h/day, 275 days/year. Energy Auditor determines that the fans can be turned off periodically with no adverse effects on the air quality. He concludes that the air flow can be reduced by 20% without affecting the air quality. He proposes two alternate Energy Management Measures: First: Place fans on a central timer so that each one is turned off for 12 minutes each hour. At any time, one of the fans is off, and the other four are running, Second: Equip fans with Variable speed drive to reduce speed of each fan by 20 % to cut down the air flow. Compare the two options for annual savings in: A. Energy B. Electricity Bill Assuming the company is on the Standard Pricing (Rate) schedule PL-1, the company is on service level 3 (distribution service). Neglect any ratchet clauses. Also: 1 IL Determine electricity cost savings for a similar industrial plant is in Yanbu, Saudi Arabia for both options. Discuss any additional energy savings (other than electrical energy consumed by motors) as a result of this Energy Management Measure? DISTRIBUTION (Service Level 3): Customer Charge: $121.00 per bill per month Capacity Charge: Summer Season Maximum Demand: $10.96 per kW per month. Winter Season Maximum Demand: $5.43 per kW per month Energy Charge: All kWh per month: 0.89 per kWh. Problem 2 In working with a chemical plant in Stillwater Oklahoma, Energy Auditor (EA) find five large exhaust fans running constantly to exhaust general plant air. They are each powered by 30-HP electric motors with efficiency of 91.75% and power factor of 0.86 lagging. The fans operate 24 h/day, 275 days/year. Energy Auditor determines that the fans can be turned off periodically with no adverse effects on the air quality. He concludes that the air flow can be reduced by 20% without affecting the air quality. He proposes two alternate Energy Management Measures: First: Place fans on a central timer so that each one is turned off for 12 minutes each hour. At any time, one of the fans is off, and the other four are running, Second: Equip fans with Variable speed drive to reduce speed of each fan by 20 % to cut down the air flow. Compare the two options for annual savings in: A. Energy B. Electricity Bill Assuming the company is on the Standard Pricing (Rate) schedule PL-1, the company is on service level 3 (distribution service). Neglect any ratchet clauses. Also: 1 IL Determine electricity cost savings for a similar industrial plant is in Yanbu, Saudi Arabia for both options. Discuss any additional energy savings (other than electrical energy consumed by motors) as a result of this Energy Management Measure? DISTRIBUTION (Service Level 3): Customer Charge: $121.00 per bill per month Capacity Charge: Summer Season Maximum Demand: $10.96 per kW per month. Winter Season Maximum Demand: $5.43 per kW per month Energy Charge: All kWh per month: 0.89 per kWh
