Case Study | 26 Apr 2011

Passfield Drive: Retrofit for the Future

Funded by the Technology Strategy Board and implemented in collaboration with Southern Housing, the aim of this social housing retrofit by bere:architects, was to show that deep-energy cuts are possible with social housing stock. The project, which was modelled using Passivhaus Planning Package, also demonstrated how improved thermal comfort, reduced energy bills and lower CO₂ emissions are possible for millions of people in existing houses.

The mid-terraced home in London was retrofitted using a combination of external thermal insulation, Passivhaus triple glazing, continuity of insulation and excellent airtightness. The project has a predicted space heating demand of 25 kWh/m²/year and has resulted in a very comfortable, healthy indoor environment that is warm in winter, cool in summer, and has plentiful high quality indoor fresh air all year round.

21° supplied, designed and commissioned the MVHR (heat recovery ventilation) system on the project. The system specified was the PAUL Novus 300 MVHR system, using a PAUL ISO Frost Protection controlled by the UST Bus Thermostat.

We specified the PAUL heat recovery ventilation because it is a good, robust system with excellent heat recovery rates. We have had great service from 21°’s Andrew Farr. Andrew really knows his stuff and is committed to getting things perfect. He is as enthusiastic as us about ensuring the HRV works well and keeping energy demand low. Green Building Store works with us to carefully design the HRV ducting system to ensure that the system will perform at its optimum. Andrew also pays careful attention to ensure that the air flow in the system is balanced properly and that it is well commissioned. With Andrew, you know you’re in safe hands.

Justin Bere - Director of bere: architects