The £9m Montgomery Primary School, Exeter, has been designed by Devon County Council and NPS South West to be net zero carbon in use. Demand was minimised by creating a Passivhaus building, and residual energy consumption was offset (on an annual basis) by the output from a roof-mounted solar photovoltaic array. Passivhaus buildings minimise heating energy consumption through superinsulated, airtight building fabric and mechanical ventilation systems incorporating heat recovery. The only form of space heating in the school is the residual heat from the pupils and teaching staff themselves plus the IT equipment. There is also modest electrical heating incorporated into the mechanical ventilation system for extreme weather conditions. There is no gas connection to the school. Domestic hot water is provided by an air source heat pump.
Five years of monitoring undertaken by the Centre for Energy and Environment at Exeter University has shown that 96% of the school’s energy requirement between 2012 and 2017 was met by the solar PV.
168kW solar PV array