OTHER CONSIDERATIONS

Windows

Semi-transparent PV modules can function as a window that will provide both natural daylight and external views for the occupier. The semi-transparent PV glazing will also moderate excessive heat gain and control solar glare. Thin film PV is generally suitable for the provision of PV windows due to its semi-transparent nature if produced with clear coatings on a glass substrate. Another method is to remove a proportion of the opaque material in a PV module to produce clear window openings.

Aesthetics

The architectural characteristic of the photovoltaic intervention will be defined by aesthetic features of the module such as geometry, texture, colour, dimensions and the specified mounting system of the PV. If addressed creatively this can result in visual interest and diversity for the elevational treatment as the optimisation of the electricity generated and the avoidance of overshadowing generally requires the PV array to be located in a conspicuous position. The PV facades, when exposed to the sun create a variety of interesting aesthetic variations of brilliance, colour, reflectivity and transparent effects, which are achieved by using different modules and alternating their positioning. Design parameters may have to addressed include zoning regulations and building codes which may govern the cell colour, type and the overall building configuration.

Colour

The integration of solar PV is perceived to be the only renewable form that can be directly utilised within the external fabric such as roofs and facades, it is particularly suitable in an urban environment. The aesthetics of the cell have been improved by recent development from BP Solar Espana. Conventional monocystalline cells normally appear dark blue or grey as the cell has been optimised for minimising the reflection of sunlight but now the cells are available in gold, magenta and steel blue. Colour variations are achieved by reflecting light from the surface of the cell, reducing the amount of light absorbed and therefore reducing the efficiencies to between 12-15% depending on the specific colour. This is in comparison to the original dark blue cells which achieve efficiencies between 16-18%.

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