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Question: 4 a a building owner is thinking about replacing oldstyle...

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4. a) A building owner is thinking about replacing old-style incandescent light bulbs with more energy-efficient light-emitting diode (LED) lighting. Estimate the payback period (in years) for replacing a 100 W incandescent light bulb with an LED light that provides the same light output, but consumes only 18 W. Given data .price of electricity- $0.13/kWh assume the light is turned on for 5 hours per day, every day price of incandescent bulb = $1.20 .price of LED S19.10 annual interest rate-4% (10 points) b) Now estimate the mass of CO2 emissions avoided per year if the light source is changed as per the above. Assume a power plant burning coal (90% carbon by weight) with a lower heating value of 30 kJ/g and 33% efficiency converting fuel energy to electricity. (10 points)

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