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Homework Help: Waste power plant efficiency math problem

  1. Nov 4, 2013 #1
    1. The problem statement, all variables and given/known data

    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?

    2. Relevant equations

    3. 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.
  2. jcsd
  3. Nov 4, 2013 #2
    Also the energy density is 20 MJ/kg not sure what this means though
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