2. Bulb switch. Six 100-watt incandescent lights are replaced by 40-watt fluores

Question

2. Bulb switch. Six 100-watt incandescent lights are replaced by 40-watt fluorescent tubes that produce five times the lumens/watt. (a) How many tubes are needed to retain the same illumination? (b) What are electric-lighting energy savings for a year's full time operation, in kWh/year? (c) What are the air conditioning savings with a coefficient of performance (COP) of 3? Assume that air conditioning is used for half the year. Coefficient of performance is the ratio of the heat removed by air conditioning to the (electrical) energy used by the air conditioner. (d) If the electricity were produced from coal, how much 10

Explanation / Answer

If COP of cooling is 3 that means it removes 3 units of heat for each unit of electrical energy consumed.

so for eg an air conditioning consuming 1kwh removes 3 kwh of heat.

therefore electricity saved in 1 hr will be 3 times the air conditioning of COP 1.

therefore 24*183=4392

4392*3=13176KW of electricity saved

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