a) What is energy labelling of appliances? Why is it an important mean for saving electrity? (4 marks)   b) The energy saving potential for lighting could be 11% of the total energy use

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a) What is energy labelling of appliances? Why is it an important mean for saving electrity? (4 marks)

 

b) The energy saving potential for lighting could be 11% of the total energy use. Describe briefly how to achieve energy saving in lighting without replacing the lamps. (3 marks)

 

c) The energy efficiency of a 220V 75W compact fluorescent lamp is 18% and operates 2600 hours a year. Determine the total energy loss and the cost to operate it for one year if the cost of electricity is 120 cents/kWh. (4 marks)

 

d) The energy efficiency of a LED lamp is 36%. If it could replace the 75W fluorescent lamp, estimate the power of the lamp and determine the cost to operate it for one year. Compared with the fluorescent lamp, what is total saving in one year? (6 marks)

 

e) If the cost of replacing the fluorescent lamp is $234, determine the payback period ,and the return on investment. (4 marks)

 

f) Apart from energy efficiency, list four advantages of LED lighting? (4 marks)