Continued Danish participation in IEA task 40, Annex 52. Zero energy buildings

The project has given valuable insight in experiences with energy neutral buildings (Net ZEB) all over the world and the challenges connected to establishing such buildings. In the project it has been demonstrated that it is possible to establish buildings that on an annual basis do not consume more energy for heating, cooling, domestic hot water and operation of the building installations plus the users electricity usage than can be produced by renewable energy sources on the building surface or the building site. The buildings analysed were all, except one, connected to the national energy grids and utilises thus the grid as storage for energy in periods with abundant renewable energy to take it back in other periods. The problems about quality and usability of the exchanged energy has been analysed in detail.

In the project a tool for evaluation tool for Net ZEB have been established, taking into account exchange of energy with the energy grids. Additionally, a number of example books have been published as outcomes from the project. Information about publications can be found at: http://www.iea-shc.org/