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Contenuto archiviato il 2022-12-27

SUPERINSULATED HOUSING FOR FAMILIES ON LOW INCOMES

Obiettivo

Demonstration of Superinsulated Houses in UK Social Housing Sector. Predicted space heating savings of 3500 kWh/house/year.
The project has been successful in that a good data set of monitored information has been collected about the performance of the houses. This allows the savings made by the super-insulated houses to be quantified and assessed. The insight that has been gained into the design and construction of the super-insulated houses will be valuable for Housing Associations wishing to build super-insulated houses in the future. The project has been able to demonstrate the advantages and disadvantages of super-insulated houses.

The project has been a technical success in that the super-insulated houses proved to be easy to construct and in that considerable savings in gas consumption have been made by the super-insulated house when compared to the control houses. During the period October 1993 to September 1994 the average super-insulated houses consumed 60% less gas than the average control house. At the same time the average internal temperature of the super-insulated houses was 1°C higher than in the control houses. The average savings in CO2 emissions made by a super-insulated house was 0.88 tonnes.

A disappointing aspect of the performance of the super-insulated houses was the level of air-tightness that was achieved. It had been hoped that background air infiltration could be reduced to below 0.2 ach-1, however tracer gas studies revealed that the level of background infiltration was in fact greater than 0.3 ach-1.

Monitoring revealed that the electricity consumption of the mechanical ventilation unit was high, being some 450kWh per year.

Economic viability:
In financial terms the project has been unsuccessful. The payback period of the super-insulated houses as built has been calculated to be 53 years. Using the lessons learned during this project however the super-insulated design could be modified to reduce the payback period to approximately 5 years.

The key to achieving this short payback period are: Replacing the central heating system by just two auxiliary room heaters, replacing the MVHR by a simpler ventilation system, including the super-insulated features in the house design from the start of a scheme and conducting a rigorous tendering process.
Nine superinsulated dwellings will be built as part of a development by the Family Housing Association at Shakespeare Road, Brixton, London. Five standard dwellings on site will be used as controls. The superinsulated houses are designed to have the following thermal characteristics. (U values in W/m2 deg K).
Walls : U = 0.191 (150 mm cavity filled with blown mineral fibre, masonry leaf construction)
Roofs : U = 0.117 (300 mm insulation quilt)
Floors : U = 0.28 (concrete beams, screed)
Windows : U < 1.2 (triple glazed with low e glass)
The control houses will be built to building regulations. All houses will be heated by gas boilers and a wet radiator system. The superinsulated houses will include a heat recovery ventilation system.
A monitoring program will record internal temperatures and energy consumption in the houses over a two year period, and be used to assess thermal performance. Occupant satisfaction with the houses will be assessed by a social survey.

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DEM - Demonstration contracts

Coordinatore

University of Westminster
Contributo UE
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Indirizzo
35 Marylebone Road
NW1 5LS London
Regno Unito

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