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Load- Shape Data for Residential Lighting: Survey Results for Incandescent and Compact Fluorescent Lamps
Bent NielsenResearch Association of Danish Electric Utilities, DEFU, Denmark Abstract Knowledge of the load pattern of compact fluorescent lamps (CFLs) is important in order to evaluate the impact on system load and to calculate the energy savings. Following a CFL give-away programme by the Danish utility SEAS a survey was made. The main purpose of the survey was to map the daily patterns of use of the CFLs, as well as incandescent lamps in the residential sector throughout the year. A secondary aim was to evaluate consumers acceptance of the CFLs. A total of 120,000 residential consumers were given 2 CFLs each, of which they were actually able to use 90% (1.8 CFLs per home). This represent only 7% of the total number of lamps per home. The survey showed, however, that the CFLs have long burning hours accounting for nearly 20% of the total burning time of all lamps. Consequently the savings in electricity consumption for lighting due to the CFLs is approximately 15% or 125 kWh per home. During the afternoon peak hours on winter days it is found, that up to 80% of the CFLs will be in use. During the morning peak hours, however, only approximately 30% of the CFLs are burning. The accuracy of the method as well as alternate methods of lighting load analysis are briefly discussed in this paper.
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