No blind

Another case of overheating... in September!

Statistically proven that:

London office building converted to apartments. Fitted with new double glazing with a U-value of 1.1

The temperatures indicated above are peak operative temperatures. For bedrooms in summer the recommended operative temperatures are between 23-26°C.

The study highlighted that with insulation to current building regulations the building retains heat in the heating season. It is difficult to lower it overnight without creating issues of noise and security hence the high starting temperatures in the rooms.

Rooms with internal blinds reduce operative temperatures compared to rooms without blinds

Rooms with external blinds reduce operative temperatures compared to rooms with internal blinds

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47.5°C 28°C 28°C 34.5°C 32°C

Min internal lux reading = 609Max internal lux reading = 72,400 (All readings taken on one day)

ExternalVenetian blind

InternalVenetian blind

Externalroller

Internalroller

External ShadingNo Shading Internal Shading Temperature at 6:00am

Internal lux readingRecommended lux level for office work - 500 lux

LuxLevels

0730 1600Time

Light level readings - no blind

100,000

75,000

50,000

25,000

0

Temperatures

Light levels

No blind

27°C

500 lux

How we did it

MeasurementsExternal measurements

Internal measurements

• Air temperature• Lux levels

• Air temperature• Lux levels• Operative temperature• Glazing surface temperature• Mullion surface temperature• Blind fabric surface temperature

Project managed by Zoe De Grussa, PhD Researcher, London Southbank University

12,620Individual temperature readings

Room fitted with internal Venetian blindControl - no blind

BBSAPO Box 232, Stowmarket, Suffolk, IP14 9ART: 01449 780 444 www.shadeit.org.uk

Copyright © The British Blind and Shutter Association 2016. All rights reserved.

All photographs taken with a wide angle lens

5,500 Individual

lux readings