Julia Plaskett, Group Sustainability Executive, Crest Nicholson Plc
Building type, sector and stage
Domestic new build, post construction, early occupation and in-use monitoring, South East, Southampton
Efficient building fabric, district heating, gas CHP, mechanical ventilation, Code for Sustainable Homes
Timing of this summary
6 months in to the 2 year BPE Project (Jan 2013)
Centenary Quay is an on-going development of 1,620 new homes to be built in phases and completed in 2022. Phase 1 comprises 168 homes of which 3 are being studied in detail. The homes in the development are designed to meet Code for Sustainable Homes Level 3.
The homes are constructed of high efficiency brick clad load bearing masonry with timber truss roofs. U- values for the walls, floors and roof range from 0.15-0.18W/m2.K.
The site is served by a site wide gas CHP district heating system with back-up gas boilers. Heat is supplied to each residential unit through a Heat Interface Unit. Each dwelling provides Mechanical Ventilation withopenable windows for natural ventilation.
Combined Heat and Power District Heating
The study includes an assessment of the efficiency of the district heating plant and distribution network. A combination of a 100kWe gas CHP engine, 2 no. 1250kW gas boilers and a 30,000 litre heat accumulator make up the current main communal plant. Extra floor space is provided to accommodate additional plant as and when the phases for the Centenary Quay master plan come on line. The integration of district energy works is becoming more common in the UK and therefore this study provides an excellent platform to understand its performance in-use and provide feedback for future installations.
The study is being carried out by the developer, Crest Nicholson, with support from independent evaluators from The Energy Institute at UCL. Fabric performance studies, such as thermography and co-heating, are to be performed whilst an in depth in-use study is currently going ahead to monitor sub-metered energy consumption and internal comfort within the 3 houses. Furthermore a design review will be undertaken along with a survey questionnaire to all 168 occupied homes on phase 1 and a review of home demonstration techniques and customer guidance.
The study has only recently begun and therefore initial findings are yet to be established.
Key Performance Indicators
Dwellings: 168 (phase 1), 168 (phase 2) 1620 in total
Code for Sustainable Homes rating: Level 3 (phase 1)
Air tightness: 6 m3/hr/m2 @ 50Pa
SAP rating: Av 88 (B)