The Northgate Yard development has been designed using the energy efficiency hierarchy with a ‘fabric first’ approach used to develop the energy strategy and which Building Regulations are the control, the hierarchy is;
The buildings fabric construction has been designed to keep running costs to a minimum and reduce heat loss and waste. The design approach adopts a mix of passive and mechanical design which involves designing to reduce the energy consumption from the outset. Natural ventilation is utilised in the internal spaces within the units alongside mechanical ventilation with heat recovery to provide air conditioning. The fans should be efficient and achieve a minimum specific fan power of 1.6 W/ (l/s) and the system is assumed to provide 2 l/s per m2 of floor area and have a heat recovery efficiency of 73%.
The internal space within the units are designed to be heated and cooled using an electric air source heat pump which is controlled via a local temperature sensor. The heat pumps should be energy efficient has been assumed to achieve a heating seasonal efficiency of 3.0 and a cooling efficiency of 4.5. Hot water should be generated efficiently using a stand alone immersion heater fed from the air sourced heat pump achieving a minimum efficiency of 90%. All pipework in the building should be insulated to minimise heat loss. Lighting has been designed to be controlled using manual switches throughout the unit. Light fittings should be energy efficient; LEDs should be utilised to achieve an efficacy of 95 lm/W of better. Display lighting should achieve a minimum of efficacy of 90 lm/W.
The units have not been designed to utilise any renewable energy generation. However, there is provision for low or zero carbon technologies to generate renewable energy at the development. Incorporating renewable energy generation would offset carbon consumption of the units and could be considered by future tenants to minimise the buildings the carbon emissions.