Building Enclosure in Hong Kong

3. Hong Kong Technical College (Tsing Yi)

Plate 3.1 Aluminium sunscreen s ar e use d for sola r control . Metalli c glaze d tiles reflec t excessive heat . HONG KONG TECHNICAL COLLEGE (TSING YI) Architectural Firm: P & T Architects & Engineers Ltd. GENERAL This case study present s anothe r projec t tha t exploit s environmental technique s t o construc t a n energ y efficient building . Sit e planning an d massin g ar e th e initial step s t o conside r fo r savin g energy . Thus , th e buildings ar e planned wit h th e short side s facing eas t and west . Machiner y room s ar e placed o n position s with stron g sun . Thi s reflect s th e plannin g fo r environmental control . The roof i s an area with muc h solar exposure. In this project, landscape planting, water features an d covered walkways are placed on the rooftop formin g usabl e amenitie s a s well a s an insulatin g layer. LOCATION The sit e is a six-hectare sit e on Tsing Yi Island. It is a rather rura l sit e with a hill as its backdrop. A highway lies o n on e sid e an d a high-ris e residentia l estat e i s nearby. The project takes advantage of natural resources and aims to capture the summer sea breeze by elevating the south side of the main building to facilitate natura l ventilation. ENCLOSURE To limit th e effec t o f th e absorbe d sola r hea t o n th e interior, deep recessed facade s an d sunshadin g fin s ar e techniques used in the elevations' window design. Some windows are openable to allow natural ventilation when possible. Th e reinforce d concret e externa l wall s ar e covered with reflective metallic tiles to reduce solar heat gain. Windows ar e constructed o f a grey tinte d glas s which absorbs some heat, thus reducing solar heat gain to the interior . COMMENTS This project uses simple means but careful planning and design t o achiev e a n energ y efficien t building . Th e overall therma l transfe r valu e i s o f 10.2 7 w/m 2 performance, compare d wit h genera l curtai n wal l buildings of 80 w/m2 . Site planning, functional planning , circulation, wal l desig n an d selectio n o f material s al l contribute t o the success of this project . 25 Building Enclosur e i n Hon g Kon g Figure 3. 1 The diagrams her e illustrate environmenta l concept s — the planning o f the site, design of elevation an d selection o f materials al l contribute to energy efficiency . Main Sjtaircor e 2hSKY ^DB EVEL Sea Breez e fk> m the j South Eas t directio n I^C'' "• - BIOC K ifT i S i i i w * ^ CONCOURS ELEV,EL Basic Teachin g Wing Natural Ventilated Courtyard Orientation of Basic Teaching Wing South Elevation Sunshading Fins Architect: P & T Architects & Engineers Ltd. Project Location : Tsing Yi Road and Sai Shan Road, Tsing Yi Islan d Materials for Enclosure : Reinforced concret e frame , aluminium window s wit h gre y tinted glass , metalli c lustr e reflective ceramic tiles, aluminium sunshading fin s Completion: 1993 Use of Waste A/C Air Room Depth and Cross Ventilation 26 Hong Kon g Technical Colleg e (Tsin g Yi) Photo by courtesy of P & T Architects & Engineers Ltd. \ *^*u * i - * ! . ^tiiisL' r f y afess • "••HE R5SSS IBS! jS|9 3 ( Plate 3.2 View of the Technical College — the rational character of the elevation is a reflection of modular planning. 27 Building Enclosur e i n Hon g Kon g Plate 3.3 View of the bridge connection an d deep overhang. 28 Hong Kon g Technical Colleg e (Tsin g Yi) Plate 3.4 An overall view of the Technical College shows juxtaposition o f blocks perpendicular to the linea r site. Photo by courtesy of P & T Architects Engineers Ltd. Plate 3.5 The metallic industria l loo k of the entrance canopy reflect s the technical character o f the institution . 29 Building Enclosur e i n Hon g Kon g...