ABSTRACT
Introduction Since Directive 2002/91/EC on the energy efficiency of buildings was adopted, there has been a strong increase in the interest in rationalizing energy consumption in both new and existing buildings. The introduction of the energy performance certification of buildings has resulted in the development of various methodologies (i.e. diagnostic tools) that may assist facility managers and energy monitoring professionals to detect faults or malfunctions in the energy behaviour of buildings. Furthermore, energy consumption monitoring contributes to the development of building energy performance classification and more comprehensive energy benchmarking systems. This chapter defines various energy rating indexes used for the assessment and prediction of energy use in buildings and describes both heating and cooling energy monitoring procedures.
