… Executive Summary An evidence base for net zero operational carbon buildings The purpose of this report is to provide a technical evidence base to support the energy performance requirements of a high-rise block for Bristol City Council. The report should be read in conjunction with the technical evidence base for new housing, prepared for Cornwall Council in June 2021. It assumes that similarly…
… to the CC report, the current policy requires new homes to achieve a space heating demand of less than 30kWh/m2/year, a total energy use of less than 40kWh/m2/year, and a net zero energy balance on site through use of solar photovoltaics. Evaluation of policy options Seven policy scenarios were assessed for a high-rise building type (16 storeys) through detailed energy and cost modelling. Policy…
… options included the building being compliant with Part L 2013, Part L 2021 and Part L 2025, UKGBC’s net zero definition, a current policy (Policy Option A - similar to Cornwall Council’s report mentioned previously) and a future policy option that is in line with RIBA and UKGBC targets for 2030 (Policy Option B). Key findings from energy modelling Energy and cost modelling indicates…
… that: • it is possible to achieve net zero carbon homes using best practice on- site solar PV design and specification. Generally, some high-rise buildings may require additional off-site renewable energy generation to achieve a net zero energy balance due to site or design constraints. • It is important to note that a solar tenant model approach, distributing the solar energy generated to all flats, instead…
… of only the landlord supply is required to maximise savings. • Actual space heat demand is likely to be 200-570% higher than indicated by SAP calculations, but still relatively low, when compared to low and mid-rise blocks. • Policy Option A would lead to running costs approximately 10-50% lower than a building built to comply with Part L 2021. • Policy Option A would deliver net zero carbon…