Lighting Homework - University of Dayton



Energy Efficient ManufacturingLighting HomeworkFor all lighting homework problems, the average electivity cost is $0.10 /kWh (including demand cost,) and the labor cost to replace or install lights is $25 /hr.A building with 200,000 ft2 of floor area and lighting power density of 1 W/ft2 operates 4,000 hours per year. Calculate:the electrical demand (kW)the energy use (kWh/yr)the total annual electricity costs ($/yr) for lighting. The company in Problem 1 makes and sells 10,000,000 parts per year with an average sales price of $2 per part and a profit margin of 10%. A lighting upgrade reduces the total annual electricity costs by 50% and increases productivity (number of parts manufactured per year) by 1%. Calculate:the annual electrical cost savings ($/yr)the annual increase in profit due to productivity ($/yr). A company has 2,000 4-foot, 4-lamp fixtures with 34-W T12 lamps and electromagnetic ballasts. The lights are on an average of 75 hours per week for 50 weeks per year. It is proposed to replace the current T12 lamps with magnetic ballasts with the same number of 32-W T8 long-life low mercury lamps with normal output electronic ballasts. The time required to replace of old lamps is 0.25 hours/fixture. The time required to install new lamps and ballasts is 0.50 hours/fixture. Fill in the shaded areas in the table below.?PresentProposedSavingsAnnual Electricity Cost???Total power (kW)Total energy (kWh/yr)Total electricity cost ($/yr)Annual Relamping Cost???Relamping lamp cost ($/yr)Relamping labor cost ($/yr)Total relamping cost ($/yr)Total Operating Cost ???Total operating cost ($/yr)Implementation Cost???Implementation material cost ($)??Implemetation labor cost ($)??Total implementation cost ($)??Simple Payback??Simple payback (months)??A manufacturing operation requires 50 fc on the workplane in a 100 ft x 150 ft facility. The walls and ceilings are painted white. The work plane is 25 feet below the lights.Calculate how many high-bay 400-W metal halide fixtures are requiredCalculate how many 6-lamp T8 HBF fixtures are required.A company near Chicago Ohare International Airport in Chicago, Illinois operates first shift with a LightSim start hour of 8 am and a LightSim end hour of 5 pm for six days per week and 50 weeks per year. The production facility is 10,000 ft2 and has 200 400-W high-pressure sodium lights. You propose installing 16 4’x 4’ skylights in the 20 foot high roof. The transmissivity of the skylights is 80% and you estimate that the reflectivity of the white ceilings and walls is 70%. What would be the annual electricity cost savings, assuming that the HPS lights could be turned off whenever the lighting level from natural light exceeds 30 fcs and are left on whenever the lighting level from natural light does not exceeds 30 fcs? (Note: these types of lights do not work with light controls) If the company will fund projects with a two-year payback or less, how much can they afford to spend installing the 16 skylights? ................
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