44 ENERGY HOUSE 2.0 SPOTLIGHT
Bellway’s Future Home project tested multiple heating systems including two different air source heat pumps, one of which was roof mounted
heating emitters at skirting board level, as well as having an infrared heating system that can be used independently to allow a comparison between them. Ventilation is provided by two systems which can be switched easily. A whole house MVHR system is provided alongside a dMEV system, this allows for both systems suggested by the Future Homes Standard consultation to be examined. Domestic hot water is supplied from the Vaillant heat pump system through to a cylinder. In addition, an air source heat pump hot water cylinder is also installed, which is required to deliver hot water when the infrared heating is being used. The Future Home, designed by Bellway, has a timber frame with a more traditional wall build up delivered using an open panel timber frame product, with PI infill, a cavity and an external brickwork skin. The property has multiple heating systems including two different air source heat pumps – a Panasonic mono-block unit and a roof mounted Worcester Bosch Hydrotop. These can feed two separate heating emitter types – wall mounted radiators and a ground floor underfloor heating system, as well as two independent infrared heating systems. The domestic hot water is fed by the Panasonic ASHP. This house also has two switchable ventilation systems; MVHR and dMEV. Research commenced in May 2023 with a detailed programme that included not only the lead partners, but also their
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supply chain, as well as innovators new to the sector. The project was supported with a £2.3m UK Research and Innovation Grant, which began in June 2023 and lasts two years. This allowed the team to not only look at energy performance, but widen the performance issues to include acoustics and air quality.
CURRENT & FUTURE TESTS The research was conducted at two levels. The first level aimed to measure the overall fabric performance of the entire house to determine if it performs as intended. The second level aimed to measure the performance of individual elements of the house’s fabric to understand their specific contribution to the overall performance. In December 2023, the Future Homes Standard consultation was released. The table on the facing page provides an overview as how eHome2 and Future Home performed against the proposed standard for each of the individual elements.
KEY LEARNINGS
Each home had its combined heat loss measured using the ‘coheating’ test method. Detailed information, including all analyses, can be found in the final reports (see QR codes on page 46). Previous research identified significant issues with the performance gap in new homes built in the UK. A study by Leeds Beckett University (LBU) revealed fabric performance gaps ranging from
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