LOW CARBON DESIGN
Draught-free construction with continuous air barrier
Thermal bridge-free construction
Summer shading
Supply air Extract air
Operable windows
Optimum winter solar gains
Supply air Extract air
Intake air Exhaust air
HRV
Triple-glazed PH-standard fenestration
Whole house
mechanical ventilation with heat recovery
Figure 1: Energy efficiency at Foleshill Health Centre – compact building form.
Night purge ventilation in summer
Super insulation via a continuous thermal envelope
The small heating system uses air source heat pumps connected to small radiators.
designed to international Passivhaus sustainability standards,* and is a major milestone for volumetric modular construction. Initial construction information is currently with the Passivhaus Institut in Germany for official certification.
The modules were designed and manufactured by Portakabin at its manufacturing facility in York. Using exacting standards of engineering to tolerances of 1 mm, the Portakabin team delivered precise control across every aspect of the project – from product design to manufacturing, measuring every resource used and any waste generated. The units were then transported to Coventry and reassembled, becoming watertight in just three days. The final fit- out, and the addition of the insulation and roof, were completed on site.
Low utility costs A mechanical ventilation heat recovery unit. Technical data
n Designed to Passivhaus standards and to be BREEAM ‘Excellent’.
n A collaborative integrated design and construction team, rather than a traditional approach, resulted in a smoother project management process.
n Works duration on site reduced by 26.5%. n The building is airtight, and fresh air is circulated 24/7. All rooms have filtered 100% fresh air from ducts in the ceiling, supplied from ventilation units that recover heat from stale air leaving the building. The air is filtered to a similar standard as an operating theatre, ensuring a safe and clean environment (ISO ePM1 - June 2021).
n A high level of insulation means it is warm in winter and cool in the summer, and energy-efficient features include triple- glazed windows, which can be opened if required. Triple- glazed windows are more energy-efficient than double glazing, and can be more comfortable to sit next to, as less cold air is created next to the glass.
n Clad with white render and wood effect Rockpanel boards on the ground floor. Rockpanel boards are durable; they are
58 Health Estate Journal September 2021
made of highly compressed stone wool fibres made from basalt – a volcanic rock. Each panel is at least 5 0% recycled material, with a 60-year lifespan, and will be recycled at its end of life.
n Each basin and sink has its own instant water heater, which operates when the hot tap is turned on. This is best practice for the control of Legionella and other waterborne pathogens.
n There is a small heating system using air source heat pumps connected to small radiators.
n Photovoltaic (solar) panels on the roof provide electricity, and all the lighting is provided by energy-efficient LED lamps.
n There are no fossil fuels used on site. n The site is easily accessible by public transport, to reduce traffic flow. Foleshill has an electric car charging point and bike storage. Significant projected annual carbon emissions savings (e.g. 411 tonnes CO2
/per annum).
n Despite a higher initial capital cost, a whole-life cost saving of a minimum of 6.3% over 40 years (using the NHS’s 1% annual energy inflation assumption) is projected.
Foleshill already has an Energy Performance Certificate (EPC) A Rating, making it one of the most energy-efficient health buildings in the UK (see Fig 1). The annual utilities running costs are projected to be around a third of the cost of a traditional build, giving significant savings over its lifetime.
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