#2 (20p) Suppose you are in charge of government agency required to select the e
ID: 2268562 • Letter: #
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#2 (20p) Suppose you are in charge of government agency required to select the environmentally sound project among two coal fired power plant projects. Compare both projects by answering the questions below, and select the best providing the justification of your decision (keep in mind that developers may cheat in their presentations) A - receives 120 MJ/s of energy from 400°C source, uses 50MJ/s of it, and has cold sink temperature of 1800, and uses coal with the energy content 24.000k /kg, 90% carbon content in coal. B - receives 155 MJ/s of energy from 500 °C source, uses 60MJ/s of it, and has cold sink temperature of 180 °C and uses coal with the energy content 22.000k kg, 90% carbon content in coal. a) Calculate all efficiencies of the plants? b) What power would be delivered by the plants and what would be the heat rate? c) What would be the carbon and CO2 emission rate in kg/k Wh for the plants? d) What plant is better?Explanation / Answer
1. Plant A Efficiency 41% (energy obtained 120MJ/s by using 50MJ/s) 50000000÷120000000= .41*100=41 Plant B effieciency is 38%. 2. Power= 120000W-50000W=70kW in Plant A and Plant B 95KW . Heat in Plant A is 120/50=2.4 Heat in lant B is 155/60=2.58. 3. Co2 emission is calculated by taking molecular weight of co2(44)/molecular weight of catbon(12) multiplipled by carbon content in the coal .. 44×.99 /12 =3.7 kg/kWh 4.Plant A is better with good effiecincy .
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