The BRE Low Energy Office (LEO) has already demonstrated, as part of a DEn Energy Efficiency Demonstration Scheme', the very real opportunities for energy eficiency that can be incorporated into a building's design within normal cost limits, Five years of operating experience and monitoring of the LEO has highlighted a number of design, commissioning, and operating practices which led to unnecessary energy use and a failure to achieve design performance on a significant number of occasions. Lessons that have been learnt from the operating experience of the LEO are discussed. Because many of the problems identified in the LEO have also been found in other, more conventional, buildings, lessons learnt have a n application beyond low energy designs. Over both the 198415 and 198516 heating seasons, the 'BRESTAR'I" optimum start control algorithm was used, and its performance shown to be significantly better than the more conventional optimiser initially installed.
Photoluminescent markings are currently finding application in emergency and safety signs. The material glows in the dark (if previously excited) and is therefore particularly useful at times of power failure, especially since its temporal luminance decay is matched approximately by dark adaptation of the human eye. Comparability was found between speeds of movement under the minimum BS5266 emergency illuminance and with photoluminescent markings alone. Questionnaire scores from subjects indicated that the latter is at least as acceptable on escape routes and is often preferred. Data are given on the photometric properties of such markings and interim design guidance is offered for their use as potential alternative or supplementary provision to the traditional emergency lighting approach.
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