14 february 2018, london indoor environment and workplace … · 2018-02-13 · professor rajat...
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![Page 1: 14 February 2018, London Indoor environment and workplace … · 2018-02-13 · Professor Rajat Gupta Director of OISD, Oxford Brookes University rgupta@brookes.ac.uk Indoor environment](https://reader033.vdocuments.mx/reader033/viewer/2022050501/5f93fa6419cb4a270c365d27/html5/thumbnails/1.jpg)
Professor Rajat GuptaDirector of OISD, Oxford Brookes University
Indoor environment and workplace
productivity: insights from WLP+ project
Healthy Buildings Conference & Expo 201814 February 2018, London
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• Indoor environment has a
significant influence on our
comfort, health and wellbeing,
given that we spend 80% - 90%
of our time indoors.
• Recently Green Building
Councils worldwide have
collated evidence linking indoor
envrionment with occupant
health, wellbeing and
productivity in offices.
• Emergence of WELL building
standard.
WELL Building Standard
Thermal comfort
(nat. vent space)
5-7°C comfort band for 80-90% acceptability
(depends on outdoor temperature)
Thermal comfort
(mech. vent
space)
22-24°C
Relative humidity
30-50%
(for 95% of business
hours)
Ventilation rate ≥ 8.5l/s/person
CO2
concentration< 800ppm
Light 300-500lux
Noise ≤ 40dBA
IEQ and productivity in workspaces
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Whole Life Performance plus (WLP+)
• Study presented here is part of WLP+
research project.
• Funded by EPSRC and Innovate UK.
• Project value: £530k, 2016-2019.
• WLP+ aims to:
• Empirically validate the link between
IEQ and staff productivity
• Test the solution in trial commercial
buildings and develop a software-
based supervisory control.
• Meta-study of existing data (Innovate UK
BPE programme)
• Case study based approach – observation
and intervention.
WLP+
Monitoring and Evaluation
IEQ and building controls:
- Measured- Surveyed
Worker productivity and satisfaction:
- Self-reported- Simulated tasks
- Measured (HR data)
Energy consumption:
- Measured
http://www.wlpplus.com/
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Innovate UK BPE programme meta study:
Perceived productivity and indoor environment (BUS
survey)
Overall air quality in summer
1 – unsatisfactory 7 – satisfactory
n = 38, r = 0.82
0
1
2
3
4
5
6
7
-40% -30% -20% -10% 0% 10% 20% 30% 40%
Perceived productivity
Overall temperature in summer
1 – unsatisfactory 7 – satisfactory
n = 38, r = 0.78
0
1
2
3
4
5
6
7
-40% -30% -20% -10% 0% 10% 20% 30% 40%
Perceived productivity
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Comfort and health
• Occupant’s overall comfort and their perceived health when in the building also
had strong, positive correlations with perceived productivity
• Overall comfort had the strongest correlation with perceived productivity
Perceived health
1 – less healthy 7 – more healthy
n = 38, r = 0.83
0
1
2
3
4
5
6
7
-40% -30% -20% -10% 0% 10% 20% 30% 40%
Perceived productivity
Overall comfort
1 – unsatisfactory 7 – satisfactory
n = 38, r = 0.89
0
1
2
3
4
5
6
7
-40% -30% -20% -10% 0% 10% 20% 30% 40%
Perceived productivity
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King’s College London
• Naturally ventilated building.
• Next to a busy roundabout and train station.
• Student administration and marketing.
• Interesting environment for studying the impact of natural ventilation and air quality.
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0
5
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01
-Feb
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Da
ily
ave
rage
tem
per
atu
res
(°C
)
Date
Average of Zone A1 Temp Average of Zone A2 Temp Average of Zone A3 Temp Average of Zone A4 Temp Average of External Temp
0
5
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09-M
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25-J
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28-J
ul
Da
ily
ave
rage
tem
per
atu
res
(°C
)
Date
Average of Zone M1 Temp Average of Zone M2 Temp Average of External Temp
0
5
10
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35
40
01
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b
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20
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25-J
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28-J
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Da
ily
ave
rage
tem
per
atu
res
(°C
)
Date
Average of Meeting room 1 temp Average of Meeting room 2 temp Average of External Temp
Indoor temperature Occupied hours in weekdays:
08:00-18:00
Internal
External
Temp (°C) Feb-17 Mar-17 Apr-17 May-17 Jun-17 Jul-17
Average temp 24.3 24.3 23.5 25.1 26.0 26.0
Minimum temp 17.7 19.2 18.0 20.4 19.8 19.5
Maximum temp 27.2 27.6 27.1 29.8 31.3 30.0
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Indoor CO2 levels Occupied hours in weekdays:
08:00-18:00
0
500
1000
1500
2000
2500
3000
3500
CO2
conc
entr
atio
n (p
pm)
Feb-17 Mar-17 Apr-17 May-17 Jun-17 Jul-17
CO2 (ppm) Feb-17 Mar-17 Apr-17 May-17 Jun-17 Jul-17
Average CO2 1443 1083 1174 823 673 642
Minimum CO2 522 512 492 469 431 438
Maximum CO2 2660 2291 3066 2082 2337 1769
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BUS survey: feedback from occupants (n: 77)
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Call volumes and CO2
levels
Productivity (Business output metrics)
Productivity data Call volumes
Time period Weekly: 30Jan – 14Jul 2017
Average emails/calls Weekly: 2,193
0
500
1000
1500
2000
2500
3000
3500
4000
400 600 800 1000 1200 1400 1600 1800
Wee
kly ca
ll vol
umes
Weekly average CO2 concentration (ppm) (08:00-18:00)
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Numerical test and indoor CO2 levels
Number of responses: 155
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Summary
• When occupants were satisfied with their indoor environment (such as
indoor temperature, air quality) their perceived productivity was found to
increase.
• Non-environmental/functional factors (design, facilities, image to visitors)
have a strong impact on perceived productivity.
• WLP+ project is empirically testing the link across work spaces using
business output/HR metrics; self-reported (survey) and measured
productivity metrics (such as time taken to complete discrete tasks).
• Measured indoor temperature and CO2 levels in the case study are found
to be above the recommended ranges during working hours. There is a
link between performance metrics and CO2 levels.
• Interventions to improve indoor temperature and CO2 levels should be
considered. This is what the WLP+ project is presently focussing on.