Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is the approximate power consumption in kilowatts for an electrical heater to raise the temperature of 20 gallons of oil per hour by 100 degrees F?

  1. 1.3

  2. 2.6

  3. 3.9

  4. 5.2

The correct answer is: 2.6

To determine the approximate power consumption of an electrical heater needed to raise the temperature of 20 gallons of oil by 100 degrees Fahrenheit in one hour, we can use the specific heat formula. The specific heat of oil is typically around 0.42 BTU/lb°F. First, we need to convert the gallons of oil to pounds. Since 1 gallon of oil weighs about 7.5 pounds, 20 gallons would weigh: 20 gallons × 7.5 lbs/gallon = 150 lbs. Next, we calculate the energy required to heat this amount of oil by 100°F: Energy (in BTUs) = weight (in lbs) × specific heat (in BTU/lb°F) × temperature change (in °F). So, using the numbers we have: Energy = 150 lbs × 0.42 BTU/lb°F × 100°F = 6300 BTUs. Now, to convert BTUs to kilowatts, we use the conversion factor where 1 kilowatt is equivalent to approximately 3412 BTUs/hour. Therefore, to find the power consumption in kilowatts: Power (in kW) = Energy (in BTUs) / 3412

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