The past

The preliminary research on ‘exergy analysis’ was carried out by the International Energy Agency in 1990, which was published in Annex 37: Low Exergy Systems for Heating and Cooling.

Following the successful results achieved within the Annex 37 project,  IEA conducted another study on exergy assessments and developed a further detailed exergy evaluations methodology and guidelines. These were published in Annex 49:Low Exergy Systems for High Performance Buildings and Communities, in 2010.

Scientist Dave Solberg’s Total Sustainability Rating Method, “Galileo’s Eye” is based on exergy analysis described in Annex 49.

As part of the Annex 49 project, Dave Solberg carried out a research study in which he simulated the Twin Cities community by Thermo-Environmental Systems. The simulation included electrical power generation, home heating and cooling and automobiles. Harmful emissions and ground water use were also considered.

After applying the exergy assessment methodology, it was found that the Twin Cities community systems exergy performance could be increased by 64% from 0.465 to 0.762. Carbon emissions can be reduced by 39% or 1,676,000,000 kilograms/year (3,690,000,000 lb/year) and ground water reduced by 73% or 15,870,000,000 kilograms/ year (34,920,000,000 lb/year).

Following table illustrates the exergy assessment results of the Twin Cities.