4 Explain why energy demand is cyclicSolutionMaking the link

4. Explain why energy demand is cyclic.

Solution

Making the link between the time use data energy load profiles lay the foundations for the residential electricity demand models based on the time use data.electricity consumption in the households:\'predictable,\'moderately predictable\' and \'unpredictable\'.predictable loads consists of limited cyclic loads taking place at a time of passive occupacy.moderately predictable loads relate to the hibtual of the occupants.unpredictable loads describe the vast majority of the of the electricity consumption.predictable loads follow a deterministric approach.

The timing of the electricity demand is derived from such occupany patterns along with the appliances holding,rating and day light distribution.Threfore the energy demand is a cyclic process based on the load requirements and variation of the loads.

for example:

The annual electrical energy consumption in most European countries averages about 2000 KWh per person (or 5.5 kWh per day) but ranges from 7467 KWh per person in Norway, where electricity is inexpensive and people use it for heating their homes, down to only 352 KWh per person in Romania where household incomes are much lower and electricity is relatively expensive. With an average household occupation of 2.6 persons this means that the typical European household uses about 14.2 KWh of electrical energy per day.Comparable domestic consumption figures for the USA are 4387 kWh per capita per year or 12 kWh per person per day or 30 kWh per household per day.A 1,000 MegaWatt power plant working with a capacity factor of 80% will thus provide enough energy for 640,000 households in the USA or 1.3 million households in Europe.