Energy-oriented deconstruction and recovery planning

The reduction of waste through the establishment of closed- loop material flows has an important role in creating a more sustainable built environment. Especially in deconstruction projects, participants could take advantage of the application of waste management and recovery strategies while adhering to the principle of ` sustainable construction'. The opportunity for materials recovery depends on the type of deconstruction technique applied at a building's end- of-life. An integrated deconstruction - recovery planning approach for deconstruction projects is developed to include ecological as well as economic benefits. This planning approach is an extension of the multi- mode resourceconstrained project- scheduling problem ( MMRCPSP) from operations research. Although the general MMRCPSP considers time - and resource - resource trade- offs, the proposed extension incorporates energy - time - resource tradeoffs. The energy - time - resource trade- offs reflect the realization of energy savings or costs over the life cycle of a building. Based on a life cycle energy analysis, recovery options can be selected for deconstructed components and materials dependent on the chosen deconstruction techniques ( e. g. demolition, selective deconstruction, manual deconstruction, and deconstruction using various resources).