Question

ANSWER ALL QUESTIONS!

1. A house has following information on bulb fixtures (Table I). The owner of the house wanted to replace all the bulbs fixtures with CFL type. The efficiency information of a typical CFL is given in the Table II and the required CFL light output (in lumens) for each of the replaced bulbs is given in Table I.  

                        Table I: Bulb fixtures information

Given Data			Required
Watts	Number of bulbs	Type of bulb	CFL light output (lumens)
40	4	Bare bulb	540
60	6	Bare bulb	1020
75	2	Bare bulb	1200
100	3	Bare bulb	1920
50	3	Reflector type bulb	561
60	2	Reflector type bulb	840
75	4	Reflector type bulb	920

The bare bulbs and reflector type bulbs are being used for 8 hours and 6 hours respectively every day.    

                      Table II: Efficiency recommendation information

To Replace Incandescent Bulb Rated at	Necessary Light Output (Lumens)	Typical CFL Replacement Wattage	Recommended CFL Lumens per Watt (lpW)
Bare Bulbs
40 watts	495 or more	11 - 14 watts	45
60 watts	900 or more	15 - 19 watts	60
75 watts	1200 or more	20 - 25 watts	60
100 watts	1750 or more	>29 watts	60
Reflector Type Bulbs
50 watts	550 or more	17 - 19 watts	33
60 watts	675 or more	20 - 21 watts	40
75 watts	875 or more	>22 watts	40

The house owner requires answers for questions 1 to 4 before he/she takes a decision.

1. Using the information given in Question 1, calculate the total annual energy consumption cost for the original fixtures if cost of energy per kWh is $0.08. (1 point)

1. $326
2. $510
3. $894
4. $900

2. Using the information given in Question 1, what is the difference in the annual energy consumption if all of the given bulb fixtures are replaced by typical CFL? The required CFL light output for the replaced bulbs is given in Table I and the CFL bulbs are used the same number of hours as replaced bulb types. (2 points)

1. 1240 kWh
2. 2840 kWh
3. 2926 kWh

Answer 1