GLAZING TACTICS OF RECENT EDUCATIONAL BUILDINGS IN THE WEST OF SCOTLAND - AN ENERGY CRITIQUE

摘要

This paper reviews four recently built educational buildings in or close to Glasgow, where the design intention appears to have been to maximise natural day-lighting, and hence minimise use of electrical lighting. A second aspect discussed is the use of windows to offset mechanical ventilation loads. The systems examined are respectively: 1] 100% south-facing, single-skin fenestration, with adjustable glass louvres shielding some windows, and interstitial venetian blinds for others; 2] 70-80% north facing, single-skin fenestration with interstitial venetian blinds; 3] 100% south to south-east, twin-skin fenestration, with adjustable cedar blinds between external and internal skins; 4] limited south-facing clerestory glazing, with extensive, and partly faceted, north-facing glazing, both single-skin and no blinds. In terms of control of natural light, including direct sunlight, the projects range from none, other than personal adaption, to manual switching and a full BMS. In two projects, locating computers close to vertical glazing is a dominant issue. Opportunities to open windows, and thus displace cooling loads, also vary widely. In evaluating strengths and weaknesses, the paper addresses the use of eco-cliche. From observation, the paper concludes firstly that inappropriate design decisions, made in regard to solar light, glare and heat, will compromise displacement of electricity. A design team may be tempted to prioritise appearance over function. Po or setting of automated controls (lights, blinds etc.), faulty automation or the fickleness of users may also adversely affect energy efficiency. On the other hand, where the brief and site permits, manipulation of plan and section can enhance energy-saving potential.