In this work a novel concept is developed that allows to interpret exergy associated with mass or energy transfers as a product of thermodynamic quality (transformability) and quantity (transformation energy). Based on this splitting of exergy into two novel properties an evaluation method is suggested that allows a transparent exergy-based comparison of different energy supply technologies. Additionally, a consistent structured procedure for the evaluation of energy supply systems for domestic heating and cooling is laid out that includes a comprehensive rule-based boundary definition and an...