Abstract
Retrofit insulated window shutters are examined. An initial investigation reveals that internal shutters are more viable in this context. Condensation is identified as a potential risk. Extensive investigations using modelling software as well as site and laboratory experiments are described which demonstrate that this risk is low. The thermal effectiveness of internal shutters is modelled and laboratory tested. Practical application: This article results from research into the possibility of creating a retrofit thermal shutter system for existing commercial buildings. Building on earlier research, the paper examines whether this type of shutter is best fixed externally or internally to existing brick clad buildings and concludes that the latter is the best strategy. It then examines whether condensation between existing glazing and the outer shutter face is a problem and finds that this is not a significant issue. The way is clear for the development of this type of system as an alternative to costly triple glazing solutions.
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