facade: a daylight study

40' 30' 15' louver and ceiling bounce light for indirect lighting louver blocks light to reduce glare N atural light from sun is unlimited. It can be used to reduce the use of artificial lighting, which will reduce the electricity cost. But natural light has a glare as a negative effect. Natural light can be controlled to be brought inside the room and reduce glare with shading device. The study is about facade design with louvers as shading device located in Charlotte, NC. The louver's angle is based on the sun position during certain time on a day. The facade faces south which is the most crucial building side in a building in Charlotte. The simulations are done in different time (10 am, 2 pm, and 4 pm) in spring equinox, summer solstice, and winter solstice which represent the extreme condition of sun angle. Room size is 15' x 30' x 40'. The angle data are obtained from ecotect weather file sun path for Charlotte Douglas International Airport (table 1). The hypothesis of this study is the size of louvers and louvers frame effect the condition of natural lighting in a room. It can be inferred from the simulation images result which is the best facade design. The criteria to decide the best design are more even luminance entire room; reduce glare, and direct sunlight. The model detail and simulation detail are presented in table 2. model number of louvres frame width time spring equinox summer solstice winter solstice a 6 small 10:00 AM a1 a2 a3 2:00 PM a4 a5 a6 4:00 PM a7 a8 a9 b 6 large 10:00 AM b1 b2 b3 2:00 PM b4 b5 b6 4:00 PM b7 b8 b9 c 24 small 10:00 AM c1 c2 c3 2:00 PM c4 c5 c6 4:00 PM c7 c8 c9 d 24 large 10:00 AM d1 d2 d3 2:00 PM d4 d5 d6 4:00 PM d7 d8 d9 azimuth altitude azimuth altitude azimuth altitude March, 21 127 40 215 50 246 30 June, 21 101 56 247 65 271 42 December, 21 145 22 206 27 230 12 10:00 AM 2:00 PM 4:00 PM time table 1. sun position data source: Charlotte Douglas International Airport from Ecotect weather file table 2. model configuration for simulation alexander suryandono computational methods - arch 6050 D01 project 3 - daylighting study project description

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Facade design using rhinoceros 3d with grasshopper to study the daylight effect inside a building

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40'

30'

15'

louver and ceilingb o u n c e l i g h tfor indirect lighting

louver blocks lightto reduce glare

Natural light from sun is unlimited. It can be used to reduce the use of artificial

lighting, which will reduce the electricity cost. But natural light has a glare as a

negative effect. Natural light can be controlled to be brought inside the room

and reduce glare with shading device. The study is about facade design with louvers as

shading device located in Charlotte, NC. The louver's angle is based on the sun position

during certain time on a day. The facade faces south which is the most crucial building

side in a building in Charlotte. The simulations are done in different time (10 am, 2 pm,

and 4 pm) in spring equinox, summer solstice, and winter solstice which represent the

extreme condition of sun angle. Room size is 15' x 30' x 40'. The angle data are obtained

from ecotect weather file sun path for Charlotte Douglas International Airport (table 1).

The hypothesis of this study is the size of louvers and louvers frame effect the condition

of natural lighting in a room. It can be inferred from the simulation images result which is

the best facade design. The criteria to decide the best design are more even luminance

entire room; reduce glare, and direct sunlight. The model detail and simulation detail are

presented in table 2.

modelnumber of

louvres

frame

widthtime

spring

equinox

summer

solstice

winter

solstice

a 6 small 10:00 AM a1 a2 a3

2:00 PM a4 a5 a6

4:00 PM a7 a8 a9

b 6 large 10:00 AM b1 b2 b3

2:00 PM b4 b5 b6

4:00 PM b7 b8 b9

c 24 small 10:00 AM c1 c2 c3

2:00 PM c4 c5 c6

4:00 PM c7 c8 c9

d 24 large 10:00 AM d1 d2 d3

2:00 PM d4 d5 d6

4:00 PM d7 d8 d9

azimuth altitude azimuth altitude azimuth altitude

March, 21 127 40 215 50 246 30

June, 21 101 56 247 65 271 42

December, 21 145 22 206 27 230 12

10:00 AM 2:00 PM 4:00 PMtime

table 1. sun position datasource: Charlotte Douglas International Airport from Ecotect weather file

table 2. model configuration for simulation

alexander suryandonocomputational methods - arch 6050 D01project 3 - daylighting study

project description

spring equinox 10 am

summer solstice 10 am winter equinox 10 am spring equinox 2 pm summer solstice 2 pm winter equinox 2 pm spring equinox 4 pm summer solstice 4 pm winter equinox 4 pm

project simulation results

The models are rendered by maxwell. Methods to determine thebest facade design is visual assesment from the render resultsbased on even luminance and glare in the room. Top images arethe room condition without facade. Model a consists of 6 louverswith small frame. Model b consists of 6 louvers with large frame.Model c consists of 24 louvers with small frame. Model d consistsof 24 louvers with large frame. To make easier, all models arecompared side by side. Larger images are provided in appendix.

a b

c d

best design: model c

spring equinox 10 am summer solstice 10 am winter solstice 10 am

spring equinox 2 pm summer solstice 2 pm winter solstice 2 pm

spring equinox 4 pm summer solstice 4 pm winter solstice 4 pm

model C, consists of 24 louversand uses small frame, is the bestdesign in this facade study. If it iscompared with other models,model C brings light through theroom in and make more evenluminance condition. It also blocksthe direct sunlight to reduce glare.I T h e d i r e c t s u n l i g h t a n dsunshading create an interestingpattern in the wall in certain time,for example at 4 pm in wintersolstice.