Radiant Intensity

The radiant intensity is a measurement of the energy efficiency of an economy. It is calculated like the report/ratio of the Consommation of energy and the production (measured by the Gross domestic product).

Description

A high radiant intensity corresponds to a “greedy” economy in energy for a level of GDP given.

The radiant intensity of a country depends on many factors. For example, it varies according to the Standard of living and from the Climat; indeed, the particularly hot or cold countries tend to have an intensity more raised than the others.

It can be affected by the energy efficiency of the machines and the buildings, the petrol consumption of the vehicles, the distances covered by these vehicles, the means of transport, the efforts of conservation or rationing of energy, or the shocks economic.

Thus, a country with a soft and moderate climate, work places on average not very far away from the residences, vehicles with low fuel consumption, grid systems common, and an important part of the population moving with foot or in Bicyclette will have a radiant intensity good weaker than a country with the extreme climate, with long distances to traverse to work, and an important use of vehicles with high consumption.

Data

In France, following the oil crises and with the policy of energy saving which rose from it, the primary radiant intensity decreased of almost 20% between 1970 and 2004, while the final radiant intensity decreased of almost 40%.

To the the United States, the primary radiant intensity passed from 15 172 BTUs by dollar 2000 in 1980 to 9336 in 2004, is a reduction of 38%.

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