Waste power plant efficiency math problem

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SUMMARY

The discussion focuses on calculating the electrical energy produced by burning 230 million tonnes of solid waste in waste-to-energy power plants with an efficiency of 20%. The energy density of the waste is specified as 20 MJ/kg. The calculations reveal that approximately 1.15 trillion kWh of electrical energy could be generated annually, which is about 30% of the total US electrical energy production of 3.8 trillion kWh. Additionally, the equivalent average electric power output from these plants would be around 131,000 MW, displacing approximately 131 coal-fired plants, each rated at 1 GW.

PREREQUISITES
  • Understanding of energy density (20 MJ/kg)
  • Basic knowledge of power plant efficiency (20%)
  • Familiarity with kilowatt-hours (kWh) as a unit of energy
  • Concept of converting tonnes to kilograms (1 tonne = 1000 kg)
NEXT STEPS
  • Calculate the total energy output from waste-to-energy plants using different efficiency rates
  • Explore the environmental impact of waste-to-energy conversion compared to coal-fired plants
  • Research advancements in waste-to-energy technology and efficiency improvements
  • Investigate the role of energy density in various waste materials
USEFUL FOR

Students in environmental science, energy engineers, and professionals involved in waste management and renewable energy solutions.

courtneywetts
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Homework Statement



If 230 million tonnes of solid waste were burned in waste-to-energy power plants that are 20% efficient

a) how many kilowatt- hours of electrical energy could be produced in a year? Compare this quantity with the total US electrical energy production of 3.8 trillion kWh annually

b) what would be the equivalent average electric power output from all those waste- burning power plants? How many 1- GW coal- fired plants could they displace?


Homework Equations





The Attempt at a Solution



For part A, I am not sure how to calculate kWh. I know that 1 tonne is equivalent to 1000 kg. I am not sure if this is relevant in any way.
 
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Also the energy density is 20 MJ/kg not sure what this means though
 

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