The Summertime Overheating Problem in Dwellings

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Technical Solutions Adapting UK Dwellings for
Heat-waves Prof L Shao Dr C Goodier S
Porritt Dr P Cropper
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Objectives

• Quantify effectiveness of technical
  interventions
• Rank single or cluster interventions
• examplar applications
• Multiple challenges
• Interactions with other CREW activities

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Previous Research
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House Types Considered
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Front north-facing
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Main assumptions

• Late 19th Century
• Solid brick external walls
• Rear extension brick cavity block
  (uninsulated)
• Red clay tiled roof
• Internal partitions plaster single brick
  plaster
• Main floor carpet on suspended timber
• Extension floor solid concrete uninsulated
• Windows pre 2002 (uncoated) double glazed PVC
• 100mm glass fibre quilt loft insulation

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Weather Data
and simulation period

• UKCIP02 Heathrow TRY 2080s Medium High Emissions
  Scenario

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Effect of Single Interventions
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Single Intervention Ranking
Reductions in maximum temperatures for single
heat wave day 10th August occupied hours
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Clustered Interventions
10th August (heat wave day)

• Light walls light roof
• Light walls shutters
• Light walls blinds
• Light walls shading
• Light walls roof shutters
• Night vent external wall insulation
• Internal wall insulation shutters
• External wall insulation shutters
• External wall insulation light walls shutters
• Full Measures (5 6 300mm loft insulation)

Moving bedrooms to ground floor?
Base case houses max temperatures bedrooms
29.30C living rooms 30.10C
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Effectiveness

• Hours over comfort thresholds for clustered
  measures occupied hours only

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Degree-hour based rankings
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Conclusions So Far

• Base case house temperatures will greatly
  exceed comfort
• thresholds under (predicted) future climates
• Applying the full range of (passive)
  clustered interventions could
• enable CIBSE comfort thresholds to be met for
  living rooms, but
• still significant problem with bedrooms
• Comfort thresholds do not provide full picture
  for severity of
• problem during heat waves
• Other solutions may need to be considered e.g.
  near passive
• Need access to weather files with heat wave
  periods
• Extensive parametric simulations too time
  consuming using IES

• Need for future weather data
• e.g., Wind speed scenario (Its magnitude and its
  correlation with temperature)

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Questions for Breakout session

• Technical interventions 1 should we consider
  more?
• Technical interventions 2 which would be the
  easiest to deliver?
• Barriers what do you think are the potential
  barriers/problems with implementing these
  interventions?