Shading and avoiding overheating

Shading and avoiding overheating

Good fenestration design requires effort, knowledge and experience but following some basic rules of thumb can help avoid the most common pitfalls.

For the UK climate do try and design without the need for external blinds

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With modest glazing designed for daylight rather than maximum solar gain, it is often possible to achieve sufficient summer shading of south glazing via the existing roof overhang or window reveals.

To fully shade south glazing at...

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It is possible to design a Passivhaus with lots of glazing. PHPP allows us to balance the high losses with extra gains and additional insulation. We can then design out the resultant summer over heating by adding shading in the form of overhangs...

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When we calculate the net energy gain and amortise the cost of glazing over an assumed life of say 20 years, we find the cost of free solar heat through south glazing is about 50p/kWh. If the window area is required for daylight, ventilation,...

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Even Passivhaus windows have about eight times the heat loss of a wall but this is partly offset by solar gains. In practice, east and west glazing has much more solar gain than typical south glazing during summer but is difficult to shade....

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The Passivhaus Trust has commissioned the ‘Designing for Summer Comfort in the UK’ guide in order to consider how modern buildings, and specifically Passivhaus buildings, can be designed to be comfortable in summer as well as winter.

Passivhaus buildings are known for delivering...

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The importance of designing domestic buildings to perform well in both winter and summer in terms of energy efficiency and comfort is being recognised as key to good design. In summer, well-insulated buildings are at risk of overheating if not effectively shaded and ventilated and this risk is...

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