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Overheating Analysis for Residential & Commercial Developments

During the design of your project, it is important to ensure that not only the dwelling is insulated well but also does not overheat across the year. Overheating analysis may be required to design around non-compliance overheating issues, as part of planning permission or as part of an energy statement.

Overheating Analysis

When designing a project, it is important to ensure overheating is not an issue across the whole year, this is to provide a good level of thermal comfort as well as limit the need for additional cooling where required. High temperatures in buildings on the very bottom line is not a comfortable environment to live or work. Therefore completing an Overheating analysis can avoid this.

 

CIBSE has produced guidance in the form of TM52, TM59 and Guide A, these guidelines set out the criteria to ensure that overheating within a building is not present. The different guidance covers commercial and residential and if the building is cooled, naturally ventilated and mechanically ventilated to be certain the correct criteria is set for the building type and design.

 

In designing your project to eliminate overheating risk, we would use thermal modelling techniques that take into consideration schedules, equipment, people and solar gains as well as the thermal performance of the project to be able to design a natural or mechanical ventilation strategy to reduce the risk of overheating. This may be just part of your design process or this could be as part of a planning condition, Energy statement or based on a failure for overheating within Part L calculations.

 

What Next?

We have produced overheating analysis for a huge variety of projects and would be more than happy to assist you with your requirements, feel free to get in touch with one of our consultants and we will be able to advice further.


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Frequently Asked Questions

A number of guides and standards are available for the assessment of overheating in buildings. CIBSE guides TM59 covers overheating in residential buildings. CIBSE TM52 covers overheating in commercial buildings. BB101 covers overheating in educational buildings.

Overheating assessments will cover a number of weather scenarios specifically to the location of the building/development. both current and future weather will be considered as well as different weather patterns such as;

  • A Moderately Warm Summer (DSY1)
  • A Summer with a short intense warm spell (DSY2)
  • A summer with a long less intense warm spell (DSY1)

A number of factors can impact the internal temperatures of a building but below are a few key factors

  • Solar Gains
  • Ventilation rates & Strategy
  • Internal gains (people, equipment, plant, lighting)
  • Internal plant (heat-generating plant i.e. DHW storage)

All of the above can contribute to a building overheating as they will raise the internal temperatures unless correctly designed and considered.

Each overheating assessment is unique to the development so the route to limit overheating is different for each assessment. however, the below outlines some mitigation strategies against overheating;

  • Architectural/local shading
  • Robust natural ventilation strategy
  • solar control glazing
  • building layout & orientation designed to reduce solar gains/increased temperatures in sensitive areas
  • Building fabric design, specifically thermal mass for the ability for heat to be dispersed/retained within the building structure.
  • Mechanical cooling

Overheating assessments are bespoke to each project/building so the pricing is not fixed, however, the cost can vary between £350 to £1000+.  If you would like an accurate fee for your overheating assessment get in touch with our team.