LowEx Communities - Optimised Performance of Energy Supply Systems with Exergy Principles
Communities are characterised by a wide range of heating and cooling energy demands. The required energy is mainly provided by the combustion of fossil fuels, which is responsible for a large fraction of the greenhouse gas (GHG) emissions. While a lot has already been achieved in the energy effieceiny sector, there are still large potentials in providing more efficiently energy for heating and cooling purposes. At the community level, different renewable sources are available. These energies are characterised by high fluctuations and different qualities: e.g. photovoltaics as electricity (high-exergy) or low temperature (low-exergy) heat from renewable energy sources. Low energy qualities are of particular interest for heating applications at moderate temperature levels, because this low exergy supply is very efficient. The main objective of the EBC Annex 64 is to demonstrate the potential of low exergy thinking on a community level as energy and cost efficient solution to achieve 100% renewable and GHG emission-free energy systems. Central challenges to reach this main objective is the identification of the most promising and efficient technical solutions for practical implementation. Aspects of future network management and business models for distribution and operation are as well essential for successful implementation and will be covered in the working phase. Aspects of transition management and policy will ensure the feasibility.
Within the EBC Annex 64 a discussion on appropriate additional indicators, supplementing the exergy assessment was initialized in order to come to a common understanding of local potentials and supply options under the preconditions of local availability. In this context the application of exergy analysis provides the necessary basis for greater local energy autonomy and impulses for local economy.