The philosophy behind EN 15251 : Indoor environmental criteria for design and calculation of energy performance of buildings.

The European Standardisation Organisation (CEN) has drafted several standards to help the member countries to implement the European Directive for Energy Performance of Buildings (EPBD) approved in 2003.One of these draft standard is the "Indoor environmental criteria for design and assessment of energy performance of buildings-addressing IAQ, thermal environment, lighting and acoustics" This paper describes the philosophy of some of the principles used in the standard, and gives some examples presented in it.