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DAYLIGHT HARVESTING AND VISUAL COMFORT IN A COMMERCIAL OFFICE BUILDING Antonis Marinis

Daylight Evaluation

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Page 1: Daylight Evaluation

DAYLIGHT HARVESTING AND VISUAL COMFORT IN A COMMERCIAL OFFICE BUILDING

Antonis Marinis

Page 2: Daylight Evaluation

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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

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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

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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