Worried about the risk of overheating? Our dynamic thermal modeling will help cool you down!
There are not currently any regulations in place and very few recommendations which deal with overheating in domestic situations. The choice of minimum temperature is a difficult decision to make as too low a temperate will lead to the installation of comfort cooling when in my not be required. Whilst too high a temperature will lead to occupant discomfort. Overheating analysis is used to simulate the potential for the building to overheat during the design process.
Why do buildings over heat?
A lot of modern designed buildings include a large percentage of glazing, with some facades having over 90% surface area glazed. This in turn increase the amount of heat transmitted into the building through solar radiation.
With ever increase stringent Building Regulations targets on carbon reduction, heading towards a zero carbon housing stock. Building design is therefore seeing an increase insulation in building fabric and tighter air leakage targets reducing the amount of heat lost through the fabric.
The orientation of the building can have a big effect on the solar gains within a dwelling. South facing façades are more likely to overheat in the summer months as they are subject to the sun for longer periods of the day. East and West façades also are subject to the sun, the East facing in the morning and the West in the afternoons. This means they are also subject to solar gain, during the day. The North Façade will have little exposure to the sun and therefore will not suffer from solar gains.
Urban centres, especially in the south and south east of the UK are expected to experience more extreme weather events with more intense and frequent hot summer. This is likely to be felt with even more impact due to the urban heat island (UHI) effect. This is as a a result of the dense built up of urban areas with reduction in open green space and is will lead to a temperature difference between the urban areas and their rural surroundings.
Overheating analysis can be used to make early design decisions to ensure that the finished building will not be subject to overheating.
How do you overcome over heating?
- Solar shading devises such as brise soleil or Louvres
- Internal shutters or blinds
- Optimum building orientation
- Solar glazing
- As a last resort comfort cooling
How can we help with Overheating Analysis?
We use 3D modelling software to simulate the building from design drawings for our overheating analysis. This model takes into account a range of issues that could have an impact on the buildings performance, including fabric, orientation and external conditions. Following CIBSE Guides TM49, Design Summer Years for London and TM59, Design methodology for the assessment of overheating risk in homes.
We can model the impact of solar glazing, different types of shading devices and degrees of opening of windows.
Want to know more?
If you would like to discuss your project or potential over heating issues, or get a quote then please do get in touch. We look forward working with you on your next project.