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thermal modelling
TM52,Part O and BB101
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did you know... • Climate projections show that we will be facing more extreme weather in the coming years. Climate predictions for 2050 are frequently being seen today. • Domestic overheating assessments are now required. Part O provides a prescriptive methodology by which the assessment must be carried out. • The assessment of overheating risk varies between different methodologies. TM52, Part O and BB101 all use variations of a similar methodology but result different outputs. • Solar gains pose a significant risk to internal comfort. Dynamic solar analysis can assist with solar gain mitigation. • Insulation, external shading and orientation all play a part in ensuring comfortable buildings. Dynamic thermal modelling can show the impact of the Lean, Clean, Green, Seen methodology. • BREEAM assessments require future weather simulations for thermal modelling credits. 2050 and 2080 weather files must be used and a PMV (Predicted Mean Vote) and PPD (Predicted Percentage Dissatisfied) assessment must be carried out.
TM52: non domestic
Addresses overheating issues in domestic properties: • Can follow a simple or dynamic modelling methodology. - Simple method looks at glazing location, orientation, opening availability and cross ventilation. - Dynamic method looks to assess proposed building against prescriptive profiles and dynamic solar modelling. • Needs to demonstrate compliance against set criteria including night time comfort. • Openings must comply with fall risk potential through sill height, railings or opening restrictors. • Cannot include internal solar blinds. • Prescriptive internal gains and profiles must be used as set out by the methodology. Part O: domestic assessments
Addresses overheating issues in educational buildings: • Must account for the needs of the students and whether they have additional needs. • Must include predicted CO 2 assessments and mitigation measures. • Many assessments have restricted window allowances to reduce projectiles being thrown from height. • Classrooms and offices must each pass a separate set of criteria. • Overheating is assessed against the maximum acceptable temperature rather than TM52 or Part O criteria. • Prescriptive internal gains and profiles must be used as set out by the methodology. BB101: education assessments
Addresses overheating issues in non-domestic properties: • Must follow the design of the building, including proposed equipment, people, lighting and solar gains. • Must utilise accurate usage and mechanical systems profiles. • Must demonstrate compliance in all spaces or the building will not pass. • Can include internal solar blinds. • Must pass two of the three criteria set out in the TM52 methodology.
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Innovation Centre, University of Essex
Purdy Street, Salthouse
Colchester Institute
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Front cover: St Nicholas Drive, Caister on Sea
our services
Provide dynamic overheating assessments for non-domestic buildings
Assess overheating risk for current and future climate scenarios
Dynamically model passive solar control and shading options
Accurately model proposed usages and troubleshoot different options to reduce energy consumption and carbon em issions
Provide simplified or dynamic overheating assessments for domestic buildings
Provide early design advice to allow for simple method to be used
Provide bespoke overheating assessments for education buildings using both current and future weather conditions
Provide evidence for BREEAM assessments
Assess buildings against all BB101 criteria
Provide early stage advice to assist with passive comfort practices
sustainability@ingletonwood.co.uk www.ingletonwood.co.uk
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