Friday, October 28, 2016

Building energy use per floor area for world's major economies declined in 2000-2012 by 5-30%

IEA's report "Building Energy Performance Metrics" presents data and analysis needed to evaluate progress and identify opportunities for improvement in building energy performance. Building energy use per floor area (see the table above) provides a measure of building energy performance relative to building space.
Energy efficiency improvements like better building envelopes (e.g. insulation, air sealing and better windows) can reduce overall building energy use and building energy use per floor area. At the same time, non-efficiency factors can also affect building energy use per floor area. For example, in the residential sub-sector, the addition of larger living spaces (greater floor area per person) can also reduce the building energy use per floor area, since some components of energy use in homes do not grow in proportion to floor area (e.g. water heating, cooking and refrigeration).
Total building energy use per capita (see the table below) declined in more than half of the major world economies, mostly in wealthier countries that started from a very high level of energy use per capita.
Total building energy use for the world in 2000-2012  grew up  by about 18%,  from 102 EJ  to 120 EJ, and represents  over 30% of total final energy consumption for all sectors of the economy. Total world's building floor has increased during the same period of time by 43.5%, from 142 billion m2 to 204 billion m2. World's population grew up by 15.5% from 6.1 billion in 2000 to 7.0 billion in 2012.