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CIBSE TM52 - Overheating Assessment

CIBSE TM52 - Overheating Assessment

CIBSE TM52 - Overheating Assessment

CIBSE TM52 - Overheating Assessment

The risk of overheating in buildings is becoming more prevalent as changing climates and global energy insecurity make the control of indoor climate increasingly problematic. Overheating occurs in a building either through inappropriate design, poor management or inadequate services. Features of a design that support lower winter heating demand (such as large areas of south facing windows, high levels of insulation, low air permeability rates and low thermal mass) can result in excessively high internal temperatures during summer months.

Our experienced assessors can guide you smoothly through compliance, from concept to completion. In addition to producing a detailed analysis of your building against the CIBSE TM52 thermal comfort metric, our service includes all the support and advice required to ensure every building achieves a pass.

Here are some points to consider before making a final choice for CIBSE TM52 assessor:

  • We provide bespoke advice tailored to meet your needs – you can be confident that the requirements are being met.
  • All calculations, reports and support are included in our quotation – there are no hidden extras!
  • We have a track record of providing advice to clients that saves thousands of pounds - you can be sure we’re providing solutions that work for you.
  • Calculations and reports are carried out by accredited and experienced construction professionals – providing cost effective and practical solutions.

Call now to get a quote or discuss your project with one of our experienced assessors.

FAQ

In response to this increasing level of risk, CIBSE developed an adaptive methodology to assess the predicted level of thermal comfort within a building. This assessment can be carried out at the detailed design stage by way of Dynamic Simulation Model. 

The TM52 overheating compliance criteria is as follows;

  • Criterion 1: Hours of Exceedance – The number of hours during which ∆T is greater than or equal to one degree (K) during the period May to September inclusive shall not be more than 3% of the occupied hours.
  • Criterion 2: Daily Weighted Exceedance – To allow for the severity of overheating the weighted exceedance shall be less than or equal to 6 in any one day.
  • Criterion 3: Upper Limit Temperature – To set an absolute maximum value for the indoor operative temperature the value of ∆T shall not exceed 4K.

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