sub-targets chapter one: l a c sit se yr lo ae nh at ...suspended radiant cooling panels underground...
TRANSCRIPT
-
Main Objective
Thesis Hypothesis
Bringing up the main methods for enhancing the interior space cooling (blocking sun radiations, decreasing penetrating of external temp., and decreasing internal heat sources)
Identifying the guidelines and effectiveness for various passive cooling strategies (radiation, evaporation, ventilation, and shading) to achieve an efficient interior cooling.
Analyzing three case studies for office buildings that deal with technological natural cooling and ventilation systems.
Sub-targets
Identifying the parameters for passive cooling strategies in order to provide sustainable comfort interior spaces
The know how of designing a sustainable commercial building depends mainly on passive cooling techniques not on mechanical air conditioning
Identifying the main building sustainability development principals
Chapter one: Overview on the main considerations for sustainable building development
Chapter Two: Passive cooling considerations and strategies
Chapter Three: Natural ventilation techniques
Chapter Four: Advanced shading and solar control techniques
Chapter Five: Case Studies: Applying Various Passive Cooling Techniques and Sustainability Strategies on Office Buildings
Chapter Six: Conclusions, Recommendations, and Future Work
Thesis Methodology Thesis Contents
Theo
retic
al
Ana
lysi
s A
naly
tical
and
Com
para
tive
Ana
lytic
al M
etho
dolo
gy
Ded
uctio
n M
etho
dolo
gy
-
Passive Cooling Techniques for Enhancing the Building Sustainability Development
Chapter Five: Case Studies: Applying Various Passive Cooling
Techniques and Sustainability Strategies on Office Buildings
The BRE environmental building
The Terry Thomas: Weber Thompson’s new office building
Council House2 (CH2), Melbourne
Energy conservation
Site selection
Water conservation
Material conservation
Indoor environmental quality
Construction Wastes Management
Operations and Maintenance
Energy-Efficient electrical systems
passive design Building
alternative Sources of Energy
Passive heating
insulation
Daylighting
Chapter one: Overview on the main considerations for sustainable building development
Chapter Two: Passive cooling considerations and strategies for enhancing the building sustainability
Radiation
Evaporation
Ventilation
Shading
Enhancing the Internal Cooling
Passive Cooling Strategies
Blocking Direct Solar Radiation
Decreasing the Transmittance of External High Temperatures
Decreasing Internal Sources Emitting Heat Energy
Chapter Three: Cooling by natural ventilation
Chapter Four: Advanced shading and solar control techniquesInsulation
-
Suspended radiant cooling panels
Underground Geothermal cooling tubes
passive evaporative cooling towers
Double skin facades
Innovative wind catchers
Glass Louvers
Metal louvers
Fabric membrane stretch louvers
Natural Passive Cooling Strategies
Radiation
Evaporation
Ventilation
Shading
Solar controlGlazing technology
Radiant cooling capillary tubes
Concrete core system
Interactive Facades
Insulation
-
Council House 2 (CH2) Melbourne, Australia
Pearl River Tower Guangzhou, China
Masdar HeadquartersAbu Dhabi, United Arab Emirates
Passive Cooling
Stratigies
Radiation
Suspended radiant cooling panels
CH2 is designed to maintain the offices temperature between 21ºC-23ºC as a mean of air and radiant temperatures
The chilled panels cover 35 % of the curved ceiling. Solar thermal driven cooling and
dehumidification system
Chilled beams
Warm air coming from the ceiling is dragged down to be cooled by chilled beam and producing a curtain of cool air over the window
presence of chilled beams located in front of the windows around the perimeter of each office zone
Underground Geothermal
Cooling
A geothermal heat sink is used to provide cooling water, so 38 °C water in the mechanical system return loop cooled to 24 °C to feed the cooling power needed, reducing the size of the mechanical plant by about 30 percent
Earth ducts which reduce temperature of outside air and provide underground pedestrian passages
Comparison between three Case Studies: Applying Various
Passive Cooling Techniques and Sustainability Strategies on
Large Scale Office Buildings
-
Ventilation
Thermal massing and night cooling
Passive Stack Driven Ventilation
Vertical supply ducts on the south façade supply air to the offices through vents
The trapped hot air in the cavity is then extracted through the ceiling void until it is extracted to the vertical exhaustion ducts
Wind cones ventilates the building by exhausting warm air from the top and bringing cool air up from its lower levels
High performance Double Skin
Façades
•Blinds in the upper and lower part of the window •External plants on the northern façade •Double glazing in the western facade•Low conductor timber windows frames
It consists of a double glazed insulated unit with integral spandrel panel in a 3.0 x 3.9m unitized panel with a cavity space 200mm
Low points of the vaulted ceiling is automatically opened at night
High-thermal-mass exterior glass cladding blocks direct solar radiations and decreases the internal cooling loads
-
Evaporation Passive Evaporative Cooling Towers
five shower towers that condition the air in the ground floor
Shading
Glass Louvers
A motorized 50mm perforated silver Venetian blind is in the east and west double facades
roof with PV cells on the external side in order to reduce the solar gain
Wood louvers
The western façade is shaded by shutters made of recycled timber
-
Energy Efficient and Sustainable
Features
Natural lighting
• Windows are located at the highest point • visible light transmittance glazing• Lighting shelves• Movable timber shutter• Glare control
integrated glass façade is providing high visual transmittance, enhancing daylight harvesting, and allowing for a reduction in the amount of artificial lighting required
staggered cones bring daylight deep inside the 1.5-million-square-foot complex. They are made from glass angled at 15-22 degrees that reflect between 15-20% of the light
Water conservation
•Water recycling•Rain water harvesting•Water saving plumbing fixtures
•Using harvested water from chilled surfaces to control interior humidity.• Reusing and recycling water to be
used for interior plantings and toilet flushing.• Using ultra Low Flow toilets, low
flow sinks and waterless
• Graywater is treated and stored for landscaping• Rainwater is collected and stored as well
Sustainable construction
The building contains about 88% recycled contents (Timber western External metal cladding shutters, Structural Concrete, Wastes reduction)
The building is constructed from high recycled materials content such as the use of recycled steel rather than concrete.
-
Energy generation
•Natural gas micro-turbine•Wind-driven turbines•Solar Power - Photovoltaic cells•Solar hot water panels
The building design incorporated three power-generating technologies: wind turbines, integrated photovoltaic and hydrogen fuel cell.
The 72,000 sq m roof contains one of the world's largest building integrated PV displays, it provides energy during building construction and during the building usage.
Building Performance
Consume 70 percent less water compared with typical mixed-use buildings of the same size.Passive cooling strategies reduce the building energy consumption by 61.5 % from the annual energy consumption
Passive cooling strategies reduce the energy consumption by 44% from the annual energy consumption.
Reduction of electricity consumption by 85%,Reduction of gas consumption by 87%,Reduction of water mains supply by 72% from 31 liters per day per person to just 8.4 litres per day per person.Light fittings consume 65% less energy,
Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8