Paper Conference

Proceedings of Building Simulation 2021: 17th Conference of IBPSA


Evaluating cost-effective retrofit at the stock level; the case of Orkney Islands

Paraskevi Vatougiou, David P. Jenkins, Peter McCallum
Heriot Watt University, United Kingdom

Abstract: This work focuses on evaluating the economic viability of different Energy Efficiency Measures (EEMs) in a gridconstrained community (some 320 dwellings) using a bottom-up housing stock energy model integrated with dynamic thermal simulations. Deriving information from Energy Performance Certificates (EPC) (or equivalent data sets) and accessing GIS (relating to geometry) data, the model automatically implements an archetyping process and creates EnergyPlus house models. Based on the current condition of the derived house archetypes, a series of EEMs (both fabric and heating system upgrades) are modelled and evaluated at the archetype-level as well as at the stock-level using economic indicators (payback period and net present value). The application of costeffective EEMs resulted in 57% energy savings across the modelled community. Average payback periods are found to be as low as 3.3 and 6.5 years for cavity-wall and loft insulation upgrades to as high as 20.1 and 21.3 years for external-wall and floor insulation upgrades, respectively. Replacement of conventional heating systems with heatpumps results in payback period of 12 years on average.
Keywords: Building retrofit, Cost-effectiveness, Housing stock
Pages: 597 - 604