Energy Conservation in the Design of Multi-Storey Buildings. by Henry J. Cowan (Eds.)

By Henry J. Cowan (Eds.)

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Extra resources for Energy Conservation in the Design of Multi-Storey Buildings. Papers Presented at an International Symposium Held at the University of Sydney from 1 to 3 June 1983, Sponsored by the University of Sydney, the International Association for Bridge and Structu

Sample text

It is essential, however, in regard to 'daylighting1, that excess glass areas not be installed, or the energy saved by turning off electrical illumination will be exceeded by the additional energy expended to counteract the heating loads and cooling loads imposed by unnecessarily large glass areas. VENTILATION AIR The minimum quantity of outside air as a percentage of total air, on a per square foot or square meter basis, or on a per person basis, is a matter that has undergone substantive changes in thinking.

It will have practically no effect on a square plan. 5 and 1:2 are taken keeping the same floor area as that of the base building. The orientation axis of the building is changed from 0 to 90 degrees in steps of 15 degrees and the corresponding fabric loads are calculated. The results are shown in Fig. 3. 0 0 N-S Fig. 3 15 30 45 ORIENTATION 60 75 90 E-W Effect of Orientation on Building Fabric Load has significant effect. 8 percent as compared to that of N-S orientation. 48 ENERGY CONSERVATION IN THE DESIGN OF MULTISTOREY BUILDINGS Wall Surface Solar Absorptance Surface colour of the external wall affects the percentage of solar radiation absorbed by the external wall and hence the heat conduction load.

5 GLASS AREA 167. 0 SURFACE SOLAR ABSORBTANCE (<*) Fig. 9 for 0, 16 and 48 percent glass areas. The results are shown in Fig. 4. It is evident that as the glass area increase the effect of surface colour is less pronounced. External Fixed Shading (overhangs) External shading of glass will reduce the direct solar radiation component transmitted and hence will reduce fabric load. Effect of a 1 m overhang projection on all four sides is studied. 8 percent in fabric load is achieved. Internal Shading It is a common practice to use internal shading devices like venitian blinds, drapes, and rollers shades in buildings.

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