CONTENT PAGE
INTRODUCTION PAGE 2
CLIMATE DATA PAGE 14
WIND ANALYSIS PAGE 15
SUN ANALYSIS PAGE 16
PASSIVE GREEN DESIGN ANALYSIS PAGE 17
REFERENCE LIST PAGE 30
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City Square Mall LOCATION: Singapore ARCHITECT: Ong & Ong Architects Pte Ltd. PROJECT:
INTRODUCTION
Picture 1: The entrance to City Square Mall
City Square Mall is located at the junction of Serangoon and Kitchener Road, Singapore, and is the first mall to integrate an urban park, City Gr een, that is used for ecological-themed activities and serves as an open spaced recreation venue. The park includes a playground, Eco-Playground, made of environmentally friendly materials, a butterfly park, a wide variety of plants and ecological-themed artworks and signs.
Completed in 2009, the mall was designed by Ong & Ong Architects Pte Ltd. It has more than 40, 000 sq.m. of retail space and has direct access to public transport such as the Farrer Park MRT station, as well as a designated parking space for visitors driving green and hybrid cars. The 5-storey atrium, comprising retail shops and food courts, leads up to a 9-storey high annex tower, occupied by fitness centres, spas and education centres.
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Picture 2: Satellite view of City Square Mall
Coordinates:
1.311188 , 103.856378
Aim:
City Square Mall aims to be the leading eco-friendly family mall by creating a fun and engaging eco-friendly shopping experience for families and children City Square Mall has been certified the Platinum Rating in
Certification:
the Green Mark scheme in Singapore Green Features:
The main passive green design features of the mall include:
a. Extended solar fins and louvres
Diagram 1: Picture showing side view of Extended Solar Fins and Louvres Source: http://www.architecturenewsplus.com/project-images/19227
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Picture 3: Extended Solar Fins and Louvres on building Source: http://www.architecturenewsplus.com/project-images/19239
b. An outdoor park
Picture 4: Picture showing plan of outdoor park
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c. A sky park
SKY PARK
Picture 5: Picture showing Sky Park Source: http://www.architecturenewsplus.com/project-images/19244
Picture 6: Sky Park
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d. Ceramic fritted low-e double glazed skylight glass integrated with with insulated metal roofing
Picture 7: Ceramic fritted low-E doubled glazed skylight integrated metal roofing
Diagram 2: Heat transfer through low-e doubled glazed glass
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e. Aluminium cladding cladding with with insulated backing wall
Picture 8: Aluminium cladding with insulated backing wall Source: http://www.architecturenewsplus.com/project-images/19238
f.
Curtain wall wall with with full height high performance low-E double double glazing glazing to optimize day lighting
CURTAIN WALL
Diagram 3: Picture showing zoom in elevation of the curtain wall Source: http://www.architecturenewsplus.com/project-images/19227
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ORTHOGRAPHIC DRAWINGS
Drawing 1: Site Plan (nts)
Drawing 2: Level 1 Floor Plan
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Drawing 3: North East Elevation
Drawing 4: North West Elevation
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Drawing 5: South East Elevation
Drawing 6: South West Elevation
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SITE PICTURES
Picture 9: Panoramic view of the interior
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Picture 10: Front façade of City Square Mall
Picture 11: Walkway on the 6th floor of City Square Mall
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Picture 12: The skypark located on the roof of City Square Mall
Picture 13: The skylight located at the food court area
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CLIMATE DATA
Figure 1: Average temperature of Singapore
Diagram 4: Average relative humidity of Singapore
Referring to Figure 1, it can be seen that the average temperature for the whole year in Singapore is 28oC. The temperatures do not vary much throughout the year and therefore it is consistent. It can be seen in Diagram 4, that the southwestern area of Singapore has a higher humidity level as compared to the other areas.
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WIND ANALYSIS
Diagram 5: A wind rose diagram of Singapore
Diagram 6: A diagram stating the direction of the prevailing winds
Referring to Diagram 5, the highest frequency of wind comes in from the North and North East of Singapore and the speed of these winds are 10 km/h and 15 km/h respectively. It can be seen the orientation of City Square Mall is angled to maximize the circulation of wind around the building.
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SUN ANALYSIS
Diagram 7: A sun path diagram for Singapore
Diagram 8: Optimum orientation of a building in Singapore
Referring to the Diagram 8, it can be seen that the blue arrow points towards the South East indicating the direction in which would be the optimum orientation for a building in Singapore to prevent overheating.
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PASSIVE GREEN DESIGN ANALYSIS 1. NATURAL VENTILATION a) Description Ventilation at a space has three main purposes: 1. To maintain a minimum air quality 2. To remove heat in a space 3. To provide air movement to enhance enhance thermal comfort
Diagram 9: A diagram showing the prevailing winds at City Square Mall
Diagram 10: Diagram showing the corner effect phenomenon
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Referring to Diagram 9, the orientation of the building maximizes the ventilation of wind coming in from the North. Due t o the angled orientation of the building, a wind phenomenon called the corner effect occurs. This is when increased wind speeds occur at the corners of a building (localized within a radius from the corner equal to the width of the building), reaching 1.5 times of the average wind speeds. It can be seen in Diagram 10, that the corner effect allows for wind to pass through the open space in City Square Mall allowing adequate thermal comfort.
Diagram 11: Diagram showing the zoning of natural and artificial ventilation
Diagram 12: Diagram showing the zoning of the outdoor area of City Square Mall
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The Zoning of the outdoor spaces allow for natural ventilation to occur as there are no major obstructions on the perimeter of the park. For example, the fountain square green roof is raised to reduce the obstruction to maximize the natural ventilation within the space.
b) Wind Phenomenon
Diagram 13: Diagram showing the cross ventilation of hot and cold air at the Fountain Square Area
Diagram 14: Section cut of the Fountain Square Area
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Picture 14: A view of the roof of the fountain square below
Due to the raised manner of the Fountain Square Green roof, the induction of cross ventilation is apparent. The lower level of the area is naturally ventilated due to this phenomenon. With the aid of a fan in t he space, the ventilation is improved resulting in a more comforting environment. The ambience of the space is further enhanced with the presence of a green wall. Wind induced pressure happen because the building, which is a f ountain square is an obstacle to the wind. The wind will be deflected and due to its momentum, it creates positive and negative pressures over the surface of the building. Referring to Diagram 15, the wind induced pressure windward side, which means the side or direction from which the wind is blowing, is positive whereas the wind induced pressure on the leeward side, which mean the side that is sheltered from the wind, is negative.
Diagram 15: The wind-induced pressure distribution is positive on the windward side and negative on the roof and the leeward side
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Besides that, cross ventilation also helps to increase thermal comfort inside an area. Referring to Diagram 13 and 14, inside the fountain square, cross ventilation occurs when cold air enters the area and hot air escapes from the area. This happens because hot air is less dense than cold air resulting in cross ventilation in the area.
To cover the wide range of required ventilation rates and the wide range of wind speeds, openings must be controlled for example by putting columns with uniform opening gaps. The fountain square square has columns with uniform small opening gaps, which is called the gap effect. The more the opening area is distributed, the more likely it is that there will be a pressure difference between openings to drive the flow (Natural Ventilation: Cross Ventilation, 2014).
Diagram 16: Picture showing the gap effect at the fountain square
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2. SUN SHADING DEVICES a) Types of Sun Shading Devices i)
Roof Overhang
Picture 15: Main entrance of City Square Mall
Overhangs have been installed on the North Western’s façade of the City Square Mall. Based on the sun analysis done on this building, it can be concluded that the North Western façade receives the mos t exposure during 12PM and 4PM and is still exposed to major sunlight with only a small amount of area shaded. However, it does help in reducing the amount of sunlight sunlight to be penetrated inside the space targeted to be shaded which is the food court area.
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Picture 16: The roof of the fountain square area
Roof overhangs are found on the Fountain Square as well, which is located on the North Western part of the mall. The mentioned shading device helps in preventing the sun from entering the water musical fountain, which is situated underneath. ii)
Fins and Louvers
Picture 17: The tower's façade with fins and louvers
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Picture 18: The fins and louvers located on the Northwestern façade
Metal fins which acts as louvers have been installed on the City Square Mall building on the North Western as well as the North Eastern facade. It has been orientated as such to help in taming down the sunlight penetrating though the window glass located behind it especially during the peak of sunlight exposure on 12PM and 4PM. Apart from that, the metal fins absorbs heat which would lessen the heat exposure from the sun entering the interior. This shading device functions well in shading the interior space of the covered area.
Picture 19: The louvers located at the sky park
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Horizontal sun louvers are found on the same level of the sky park, orientated towards the North Western. It aids in shading the walkway since the sky park is an open space. However, it only shades a small amount of area. iii)
Awning
Picture 20: The green awning located on the roof of the southwestern façade
Glass awning system has been discovered on the South Eastern façade of the City Square Mall. This façade receive the least sunlight exposure, which is why the installation is at the top of building. The sunlight would be refracted away from the entrance, which is situated below the awning. The minimal shading is helpful as such there are less sunlight exposure occurs on the mentioned area.
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b) Sun Shading Analysis at the Fountain Square
Diagram 17: A section cut of the fountain square on the 21st of March at 9am
Diagram 18: A section cut of the fountain square on the 21st of March at 12pm
Diagram 19: A section cut of the fountain square area on the 21st of March at 4pm
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Diagram 20: A section cut of the fountain square area on the 22nd of June at 9am
Diagram 2: A section cut of the fountain square area on the 22nd of June at 12pm
Diagram 21: A section cut of the fountain square area on the 22nd of June at 4pm
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Diagram 22: A section cut of the fountain square area on the 22nd of December at 9am
Diagram 23: A section cut of the fountain square area on the 22nd of December at 12pm
Diagram 24: A section cut of the fountain square area on the 22nd of December at 4pm
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The roof overhang on the fountain square area can be proved to be effective in sun shading. This is because throughout the year a major portion of the basement area is shaded. The reason that there should be lighting within the space is because of the presence of the green wall underneath the space. Besides shading the interior spaces, the roof overhang shades the areas on the ground level as well further improving the comfort of the users of the space.
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REFERENCE LIST
Aizat, M. (n.d.). Environmental Analysis of City Square Mall . Retrieved May 15, 2014, from http://www.coroflot.com/mohammedaizat/Environmental-Analysis-of-CitySquare-Mall
Barker, N. (n.d.). Natural ventilation: cross ventilation. ventilation. Retrieved May 21, 2014, from http://www.architecture.com/SustainabilityHub/Designstrategies/Air/1-21-3-naturalventilation-crossventilation.aspx
BCA Greenmark . (n.d.). Retrieved April 2, 2014, from http://www.greenmark.sg/property-detail.php?id=14
City Square Mall - Home. Home. (n.d.). Retrieved May 4, 2014, from http://www.citysquaremall.com.sg/index.php
City Square Mall - Singapore's First Eco-Mall ~ Merlion W ayfarer Goes Green [Web log post]. (n.d.). Retrieved from http://merlionwayfarergoesgreen.blogspot.com/2013/06/city-square-mallsingapores-first-eco.html
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City Square Mall . (n.d.). Retrieved May 19, 2014, from http://www.architecturenewsplus.com/project-images/19227
Double glazing for thermal insulation. Low-E –energy –energy saving glass - Double Glazing Info. Info. (n.d.). Retrieved April 1, 2014, from http://www.doubleglazing-info.com/Choosing-your-windows/Types-of-glass/Low-E-energysaving-glass
Green building experts shop for ideas i deas at Singapore’s first eco-mall eco -mall | News | Eco-Business | Asia Pacific . (n.d.). Retrieved May 19, 2014, from http://www.eco-business.com/news/green-building-experts-shop-forideas-at-singapores-first-eco-mall/
Marusiak, J. (2011, September 17). Green building experts shop for ideas at Singapore’s first eco-mall | News | Eco-Business | Asia Pacific . Retrieved April 2, 2014, from f rom http://www.eco-business.com/news/greenbuilding-experts-shop-for-ideas-at-singapores-first-eco-mall/ site location plan. plan. (n.d.). Retrieved May 21, 2014, from http://www.arthitectural.com/ongong-city-square-mall/site-location-plan/
Thermal mass and Designing for Heating and Cooling . (n.d.). Retrieved April 1, 2014, from f rom http://www.level.org.nz/passivedesign/thermal-mass/thermal-mass-design/
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Thermal mass and Passive Design. Design. (n.d.). Retrieved April 1, 2014, from f rom http://www.level.org.nz/passive-design/thermal-mass/
What is Energy-efficient Glazing? (n.d.). Glazing? (n.d.). Retrieved April 1, 2014, from http://www.pilkington.com/en-gb/uk/householders/types-of-glass/energyefficient-glass/what-is-energy-efficient-glazing
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