REFURBISHMENT CASE STUDY SOCIAL HOUSING


triple glazing throughout and high levels of air tightness. Fresh air is provided by a mechanical ventilation system with heat recovery (MVHR). Ten photovoltaic (PV) panels and a vacuum tube collector on the roof provide renewable electricity and water heating. Expected U-values and other projected performance data are shown in the table on page 40. A key innovation of the Thamesmead


project is a highly-insulated solar-air collector prototype integrated into the external insulation on the south façade. The


10 20 30 40 50 60 70 80 90 100 110 120


0 111 99 49 41 36 31 28 25 19 19 14 -5 17


TSB target Total emissions Primary heating Secondary heating Hot water Pumps and fans Lighting Appliances Cooking Photovoltaics


prototype consists of a cavity containing a black perforated metal sheet to absorb solar radiation and a highly insulated translucent cover, consisting of polycarbonate panels fitted with high-performance granular ‘aerogel’ insulation, to reduce heat losses to the outside. Aerogel is an emerging material in the


UK construction market. This unique nano-porous translucent insulation material has the lowest thermal conductivity of any solid, retaining up to four times as much heat as conventional


The whole-house CO2-reduction strategy


Renewable Technologies


Aerogel solar collector: (Connection to MVHR extract-air ductwork)


38


CIBSE Journal June 2012


www.cibsejournal.com


Baseline


Architectural changes


Insulate roof, walls & floor


Windows & doors


airtightness MVHR


Condensing gas boiler


DWH solar thermal


appliances PV panels


Total CO2 emissions


TSB target Lights & Increased


Whole house CO2 emissions (kgCO2/m /year) 2


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