External vs internal shading systems

Many reputable studies have been conducted into the efficiency of external and internal shading systems. Research findings by Australian Institutions and summary figures are available through the CSIRO. The objective with any shading device is, of course, to keep the inside temperature in a range where our bodies feel comfortable and perform at their best. It has been well established that these temperatures range between 18° and 25° Celsius. To achieve and maintain this comfort zone we need to spend valuable energy cooling and heating our homes and workplaces.

adjustable and retractable external venetians

  • Allow maximum exclusion of solar radiation relative to the suns position.

  • Reflect light internally whilst also excluding heat.

  • Control natural light without glare.

  • Maintain privacy whilst excluding heat.

  • Maintain and allow entire views through windows.

  • Maximise winter solar heat gain.

  • Allow maintenance or window cleaning.

  • Self-cleaning.

  • Thermal energy

    Heat sources produce thermal energy which acts to directly increase air temperature. This thermal load may be absorbed by water vapour. Internal sources of heat gain production include, but are not limited to, body heat, lighting, machinery and heat passage between rooms.

    Heat gains from the external environment are caused by the passage of solar radiation through mediums and structures such as walls, ceilings, glazed window surfaces, doors and the infiltration of external air. External heat gains have a decisive impact on the thermal load of buildings. Window design, surface area and orientation are all factors which affect this loading dramatically.

    Utilising the innate properties of aluminium, which provides high solar radiation reflection and low absorption and transmission values, the ev80 & ev93D act to effectively reduce household energy requirements, carbon dioxide and greenhouse gas emissions and expenditure. Locally and environmentally, these systems maximise internal light and thermal comfort levels whilst allowing external views to be maintained.