Thermal Test Results

With buildings accounting for approximately 40% of the total energy consumption in OECD countries, the development of low energy dwellings is seen as key to achieving energy reduction and carbon emission targets which EU member states have committed to – the so called 20‐20‐20 targets. Significant effort has been directed at developing techniques for low energy new builds however the thermal upgrading and retrofitting of existing housing stock must be considered as crucial in achieving carbon targets as over 70% of the buildings which will be around in 2050 already exist. In particular windows have long been recognised as a principle source of heat loss from buildings and are generally regarded as a problematic building element when it comes to improving thermal performance.

This problem is exacerbated in the case of historic buildings be they listed, non listed or complementing a townscape within a conservation area as they frequently comprise single glazed sliding sash windows which must be retained in order to maintain the architectural integrity of the building. This type of window system generally exhibits high rates of heat loss which can have a major impact on the energy efficiency of a building. Secondary glazing systems and a range of other alternatives methods may be employed to reduce this however most commercially available systems require some form of framing. In addition, many of the options available have horizontal transoms which make them obtrusive and detract from the aesthetics of the window.

A glass shutter has been designed which requires no additional framing, has no horizontal transoms and is quite discreet when in position on the window when viewed from outside the building. Internally the side fixing mechanisms are covered by curtains. They have a novel hinge system so they can be easily retracted for cleaning of both the window and the shutter; for ventilation purposes and access to an escape route via the window in the event of an emergency.


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