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Part O Overheating Report for Building Regulations (TM59 Compliant)

TM54 and TM59 are both technical memoranda (TM) published by the Chartered Institution of Building Services Engineers (CIBSE) in the United Kingdom. These documents provide guidance on overheating analysis in buildings, particularly in the context of climate change and increasing temperatures. Here's an explanation of each:

  1. TM54: "Designing for the Demand for Cooling" - This technical memorandum focuses on the demand for cooling within buildings and provides guidance on how to design buildings that mitigate overheating risks while minimizing the need for energy-intensive cooling systems. TM54 emphasizes passive design strategies, such as shading, natural ventilation, thermal mass, and building orientation, to reduce internal temperatures and dependency on mechanical cooling. The document also discusses factors such as occupant comfort, building usage, climate data analysis, and future climate change projections.

  2. TM59: "Design methodology for the assessment of overheating risk in homes" - TM59 specifically addresses the assessment of overheating risk in residential buildings. It provides a methodology for evaluating the risk of overheating in homes, considering factors such as building design, construction materials, occupancy patterns, and climatic conditions. TM59 outlines a step-by-step approach for conducting overheating risk assessments, including data collection, modeling techniques, simulation software usage, and interpretation of results. The memorandum aims to help designers, architects, and engineers identify and mitigate overheating risks during the design stage of residential projects, ultimately improving indoor thermal comfort and reducing reliance on mechanical cooling systems.

In summary, TM54 and TM59 provide valuable guidance on overheating analysis and mitigation strategies in buildings, with TM54 focusing on cooling demand reduction in various building types, and TM59 specifically addressing overheating risk assessment in residential buildings. These documents are important resources for building professionals seeking to design energy-efficient, thermally comfortable buildings in response to the challenges posed by climate change.

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