Department of Architecture & Civil Engineering, Unit Catalogue 2008/09 |
AR30278 Lighting and acoustics |
| Credits: 6 |
| Level: Honours |
| Semester: 1 |
| Assessment: CW 40%, EX 60% |
| Requisites: |
| Before taking this unit you must take AR20004 |
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Aims: To provide a theoretical grounding that will enable students to tackle the range of lighting calculations likely to be encountered in practice in relation to the control of natural light through the building envelope. To strengthen the link between theory and design in acoustics.
Learning Outcomes: The successful student will be able to demonstrate: * an extended knowledge of lighting units; * an understanding of the theory used to calculate the transmittance of shading devices and the illuminances within rooms from natural lighting; * an understanding of the analytical methods and practical techniques for the acoustic design of buildings. Skills: Ability to use a range of analytical methods in the design of natural and artificial lighting and acoustics. Content: Lighting units: Grassmann's Laws, solid angle, projected areas, light flux, illuminance, luminous exitance, luminous intensity and luminance. Direct illuminance: Point sources, extended sources, approximating finite sources as point sources, arrays of luminaires. Describing Luminaires: Polar curves, Iso-candela charts, Flux proportions, Standard data formats, Aspect factor of line sources. Sky illuminances: Uniform sky, CIE sky, clear sky, models approximating real skies, choice of model to use, construction of Waldram diagrams. Uniform luminance: Reflectance of real surfaces, equivalence of uniform diffuse sources, relationship between luminance and luminous exitance, unit hemisphere method, vector summation method. Flux transfer: Definition of form factor, mutual exchange coefficients, law of reciprocity of uniform diffuse sources, special reciprocity, form factor algebra. Inter-reflections: Assumptions employed, successive reflections, steady state exchange between surfaces, use in lighting, use in thermal calculations, transmittance through shading devices, lighting simulation programs. Shading design: The design of total exclusion shading masks. Combined Lighting: Top up lighting, Permanent Supplementary Artificial Lighting Installations, Energy use through year. Control: Issues of control, energy strategies, comfort limits. Wave theory: plane and spherical waves Standing waves. Propagation across medium boundaries. Vibration in buildings: free and forced vibration. Damping. Machine motion, inertial bases Traffic noise. Sound insulation case studies. Ventilation noise design: - ductborne and regenerated noise Speech in offices Open plan offices |