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DAYLIGHT HARVESTING AND VISUAL COMFORT IN A COMMERCIAL OFFICE BUILDING
Antonis Marinis
2
Contents Overview
Building description Objectives Methodology
Assumptions Methods Adopted
Key achievements Summary
Daylight Harvesting and Visual Comfort/Antonis Marinis
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Overview Daylight was from centuries a crucial part of
building design. Perceived benefits of daylight
Possible net fuel cost saving Qualitative visual comfort Ability to view the world outside
Electricity for artificial lighting is more expensive compared to oil and gas for heating.
Artificial lighting takes up 10% - 25% of the building’s energy consumption.
Daylight Harvesting and Visual Comfort/Antonis Marinis
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Overview-Building description Four storey office building
at BRE Garston in Watford.
Constructed in 1964. Hasn’t been refurbished
since 1964. Working hours from
8:00-17:00. BRE funds full
refurbishment of the building.
Future use as an exhibition hall.
Daylight Harvesting and Visual Comfort/Antonis Marinis
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Objectives Estimate daylight impact in the case
study office building. Research ways to increase daylight
penetration into the building. Improve daylight uniformity and visual
comfort. Gain potential energy savings from
reducing use of artificial lighting.
Daylight Harvesting and Visual Comfort/Antonis Marinis
6 Daylight Harvesting and Visual Comfort/Antonis Marinis
Methodology-Assumptions Limitations-Assumptions
Surrounding geometry were not considered. Shading analysis was not performed due to time
limitations. Artificial lighting was not considered. Software Tools used
AutoCAD 2012 Autodesk Ecotect Analysis Radiance Daysim
7 Daylight Harvesting and Visual Comfort/Antonis Marinis
Methodology – Methods Adopted
11.6.2014
Methods Adopted Scenario 1:
Internal layout style was converted from cellular to open plan.
New windows were added in the east façade. Change the existing windows to ones with higher
visual transmittance and solar heat gain coefficient. Scenario 2:
External layout of the South and East facades were changed from vertical to tilt.
Change the initial windows to ones with higher visual transmittance and solar heat gain coefficient.
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Methodology – Methods Adopted/Scenario1
Daylight Harvesting and Visual Comfort/Antonis Marinis
Internal Layout – Cellular Type
Internal Layout – Open Plan Type
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Methodology – Methods Adopted/Scenario1
Daylight Harvesting and Visual Comfort/Antonis Marinis
East façade – Basic Scenario East façade – Scenario 1
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Methodology – Methods Adopted/Scenario2
Daylight Harvesting and Visual Comfort/Antonis Marinis
South East facades – Basic Scenario
South East facades – Scenario2
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Key Achievements (1/4) Scenario 2 was found to be the best case
scenario. Daylight penetration increased by 40%. Daylight uniformity increased by 4%. Daylight autonomy increased by 10.5%. Potential savings from artificial lighting
by 15% annually due to increased daylight performance.
Daylight Harvesting and Visual Comfort/Antonis Marinis
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Key Achievements (2/4)
Daylight penetration increase by 40%.
Ground Floor
First Floor Second Floor
Third Floor Average Building
0
2
4
6
8
10
12
14
16
Average Daylight Factor for all three Scenarios
Basic ScenarioProposed Scenario 1Proposed Scenario 2
Day
light
Fac
tor
(%)
Daylight Harvesting and Visual Comfort/Antonis Marinis
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Key Achievements (3/4)
Uniformity increase by 21%.
Ground Floor
First Floor Second Floor
Third Floor Average Building
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
Uniformity for the three Scenarios
Basic ScenarioProposed Scenario 1Proposed Scenario 2
Uni
form
ity
Daylight Harvesting and Visual Comfort/Antonis Marinis
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Key Achievements (4/4)
Daylight autonomy increase by 10.5%.
Ground Floor
First Floor Second Floor
Third Floor Average0
10
20
30
40
50
60
70
80
DA for the three Scenarios
DA Basic ScenarioDA Proposed Scenario 1DA Proposed Scenario 2
Day
light
Aut
onom
y (%
)
Daylight Harvesting and Visual Comfort/Antonis Marinis
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Summary Intense study on the aspect of
daylighting in a commercial office building.
Two proposed scenarios were evaluated in order to maximize daylight impact, visual comfort and energy savings.
A significant increase in terms of daylight harvesting and energy reduction was achieved.
Daylight factor was increased by 40%.Daylight Harvesting and Visual Comfort/Antonis Marinis
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THANK YOU
Daylight Harvesting and Visual Comfort/Antonis Marinis