A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Buildings energy retrofit: dealing with uncertainty
Over the span of the past decade, the interest in issues related to building energy efficiency has been ever growing. Consequently, an increasing amount of studies has focused on the eco-nomic viability of energy retrofit measures. Despite all these research efforts, the results are still uncertain and conflicting. Nonetheless, such studies have brought out the main variables affect-ing the economic feasibility of interventions improving building energy performance: savings-investment ratio, cost-effectiveness of energy supply, energy price trends. The aim of this paper is to investigate the relevance of an often disregarded aspect: the rate of time preference as an expression of households’ behaviours, that is to say, the discount rate adopted within several valuation approaches, which are based on discounted cash flow. A case study analysis is performed on a refurbishment project. It concerns a public housing estate, built during the seventies, located in the suburbs of Bologna. A number of retrofit alternatives are examined, by resorting to different judgement criteria, particularly the Net Present Value. It is shown that uncertain results may occur repeatedly, more frequently than literature has evi-denced. Moreover, unclear outcomes closely correlate to the discount rate level, which may lead to conflicting options; therefore, it is hard to unequivocally identify the alternative characterized by the highest NPV.
Buildings energy retrofit: dealing with uncertainty
Over the span of the past decade, the interest in issues related to building energy efficiency has been ever growing. Consequently, an increasing amount of studies has focused on the eco-nomic viability of energy retrofit measures. Despite all these research efforts, the results are still uncertain and conflicting. Nonetheless, such studies have brought out the main variables affect-ing the economic feasibility of interventions improving building energy performance: savings-investment ratio, cost-effectiveness of energy supply, energy price trends. The aim of this paper is to investigate the relevance of an often disregarded aspect: the rate of time preference as an expression of households’ behaviours, that is to say, the discount rate adopted within several valuation approaches, which are based on discounted cash flow. A case study analysis is performed on a refurbishment project. It concerns a public housing estate, built during the seventies, located in the suburbs of Bologna. A number of retrofit alternatives are examined, by resorting to different judgement criteria, particularly the Net Present Value. It is shown that uncertain results may occur repeatedly, more frequently than literature has evi-denced. Moreover, unclear outcomes closely correlate to the discount rate level, which may lead to conflicting options; therefore, it is hard to unequivocally identify the alternative characterized by the highest NPV.
Buildings energy retrofit: dealing with uncertainty
GABRIELLI, Laura (author) / Copiello Sergio (author) / Gabrielli, Laura / Copiello, Sergio
2016-01-01
Conference paper
Electronic Resource
English
DDC:
690
Uncertainty impact on decisions related to historical buildings energy retrofit
| BASE | 2018
University Buildings Energy Efficiency Lighting Retrofit
| British Library Conference Proceedings | 2013
Dealing with Technical Uncertainty
| British Library Conference Proceedings | 1992