sun path analysis and sun radiation

8/13/2019 Sun Path Analysis and Sun Radiation

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1.1 Sun Analysis

1.1.1 Sun Path in Bandar Sunway 46150, Petaling Jaya

The sunpath for the Petaling Jaya is approximately at a latitude of 3.1 and a longtitude of101.7 . This housing estate receives consistent exposure to sunshine yearly as Malaysia is

located on the euator. !andar "un#ay $%1&0 has the sun at at approximately '% to the north

during the #inter solstice and '% to the south during the #inter solstice.

(igure 1.1.1.1 "un Path )iagram

*s can +e seen #ith (igure 1.1.1 there are no

near+y highrise +uildings in range around that can

o+struct our chosen housing from direct sunshine

or radiation throughout the day.

,n (igure 1.1.'- the housing estate is ho#ever

sho#n to +e filled #ith similar terrace houses of

the same dimensions that provide shade at

particular times of the day.

The image also highlights that there is insufficient

surrounding folliage around the su+ect +uilding to

provide any significant amount of coverage on the

(igure 1.1.1.' /ie# overlooing the street "outh2 +uilding.


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(igure 1.1.1.3 )iagram illustrating the position of the sun throughout the day

n 1&th "eptem+er- the solar noon #hich is the moment #hen the "un transits the celestial

meridian and is highest a+over the hori4on2 is sho#n to +e at 151&pm. The sun rises and sets

at 751&am and sets at 751&pm respectively. Throughout the month- the sun #ill continue to

rise and set at almost exactly the same time. n the 1$th and 1%th of "eptem+er- the sun #ill

contine to rise and set at the same time as the 1&th +ut #ill have their solar noons at 1500pm

instead of 151&pm.

(igure 1.1.1.% /isuali4ation of the "un at 151&pm on the 1&th of "eptem+er


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1.1.2 Sun-shadow Analysis in Roo !nit

The position of sun on 1&th of "eptem+er '013 at 6am in the morning is approximately 10$

8 a4imuth and $3 altitude.

(igure 1.1.'.1 "hado# created +y the sun at 6am on the 1&th of "eptem+er '013

(igure 1.1.'.' ,llustration of the cross section and plan sho#ing the solar rays at 6am on the 1&th of "eptem+er '013

There is little to no penetration of the solar rays into the room unit at 6am as sho#n in (igure

1.1.'.1. The solar rays are instead seen +ouncing off the roof overlooing the porch from the

east to the #est. This is most liely due to the uniue positioning of the house and the lac of

openings on the east side as it is a terrace house.


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The position of sun on 1&th of "eptem+er '013 at %pm- in the afternoon is approximately

'7& 8 a4imuth and '& altitude.

(igure 1.1.'.3 "hado# created +y the sun at %pm on the 1&th of "eptem+er '013

(igure 1.1.'.' ,llustration of the cross section and plan sho#ing the solar rays at %pm on the 1&th of "eptem+er '013

*s the day approaches closer to sunset- at around %pm the solar rays can +e seen +etter

illuminating the room unit in #arm light. This is helped #ith the t#o #indo#s and the slight

recession +y the +edside that allo# light to penetrate and reflect into the room. )espite +eing

later in the day- in can +e inferred that from the positioning of the house #hich is at the corner

end of the ro# of terrace houses #ith less o+struction of the terrace units on the #est- it is

more exposed to the solar rays from that direction instead of the east as sho#n in (igure

1.1.1.12.


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1.1." Solar Radiation

"olar radiation- #hich is the energy released +y the sun in all directions- on a +uilding is

highly influenced +y the position of the +uilding and the sun at a given time. The intensity can

thus +e reduced +y o+structions that prevent said radiation to strie on selected surfaces of a

+uilding.The montly average of solar radiation in 9uala :umpur- Malaysia a recorded in "eptem+er is

7'3% ;h


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(igure 1.1.3.' ,mage sho#ing the slanted roof

(igure5 The penetration of the sunlight to#ards the selected room

(igure5 Presence of the neigh+ouring #all shielding further light penetration

sun path analysis and sun radiation

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