Overheating Calculations

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Overheating Calculations

Overheating calculations have become mandatory under the UK Building Regulations, introduced with the advent of Part O in December 2021, fully enforced by June 15, 2022.

These calculations are essential for evaluating the potential risk of overheating within a building during warmer months. Overheating can lead to adverse health effects for occupants, discomfort, and decreased energy efficiency. Factors such as solar gain, internal heat gains, ventilation rates, and thermal mass of the building are considered in these assessments.

Two types of calculations may be required: the Simplified Method and Dynamic Thermal Modelling.

The Simplified Method

Simplified calculations offer a quicker means of gauging the overheating risk within a building. This approach operates on the premise that excessive solar radiation coupled with inadequate ventilation exacerbates overheating.

These calculations rely on basic assumptions and generalized data to estimate the likelihood of overheating. While not as precise as dynamic thermal modeling, they serve as a valuable initial assessment tool for understanding potential overheating risks.

Simplified calculations are applicable to buildings situated outside the postcode areas delineated in Appendix C of Part O of the Building Regulations. Within these regions, the simplified method suffices for evaluating overheating risk and ensuring regulatory compliance.

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Dynamic Thermal Modelling

Dynamic thermal modeling represents a more intricate and precise approach to evaluating overheating risks within a building. This method employs sophisticated computer simulations to simulate the thermal dynamics of a structure, incorporating variables such as solar exposure, internal heat generation, and ventilation rates, adhering to the methodology outlined in CIBSE’s TM59 guidelines. This enables a more thorough and accurate appraisal of overheating risks.

For buildings situated within the postcode areas specified in Appendix C of Part O of the Building Regulations, dynamic thermal modeling is mandatory. Given the heightened risk of overheating in these regions, reliance solely on the simplified method is deemed inadequate for ensuring regulatory compliance. Employing dynamic thermal modeling allows for a precise assessment of overheating risks, facilitating the implementation of appropriate mitigation measures.

Do I need an Overheating Calculation?

When embarking on the design or construction of a new building in the UK, it is imperative to undertake overheating calculations to adhere to the Building Regulations. This requirement pertains to both residential and non-residential structures. It’s important to note that Part O of the Building Regulations does not extend to residential dwelling extensions post-construction or to buildings undergoing significant changes in use.

How do I pass my overheating calculation

Achieving success in your overheating calculation entails designing your building to mitigate the risk effectively. This involves implementing strategies like utilising high-performance insulation, employing window shading to minimise solar gain, and integrating natural ventilation systems. Additionally, considering the building’s orientation and its surrounding environment is crucial, as these factors heavily influence overheating risks.

Contact us today to receive a quote for your overheating calculation, ensuring compliance with Part O of the Building Regulations.

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