31599063 Building Energy Passive Cooling Techniques
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Transcript of 31599063 Building Energy Passive Cooling Techniques
7/28/2019 31599063 Building Energy Passive Cooling Techniques
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Passive cooling techniques
PASSIVE COOLING TECHNIQUESAsia Pro Eco Training Workshop in the Maldives
B. Mohanty
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Passive cooling techniques
Building cooling strategy
Minimizing solargains through
fabric
Minimizingcasual gains
Daytimeventilation
Minimizing solargains through
openings
COMFORT TARGET
COMFORT TARGET
PROVISION OF COOLING
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Passive cooling techniques
Building cooling strategy
PROVISION OF COOLING
PASSIVE COOLING
Radiant coolingto night sky
Night airventilation
Latent cooling bydehumidification
Earth contact
MECHANICAL COOLING
Active Solar ConventionalRefrigeration
Humidity
control
Air
movement
USE OF AMBIENT HEAT SINKS ADJUSTING COMFORT PARAMETERS
PROVISION OF COOLING
PASSIVE COOLING
Radiant coolingto night sky
Night airventilation
Latent cooling bydehumidification
Earth contact
MECHANICAL COOLING
Active Solar ConventionalRefrigeration
Humidity
control
Air
movement
USE OF AMBIENT HEAT SINKS ADJUSTING COMFORT PARAMETERS
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Passive cooling techniques
Passive cooling
• Passive design
• Internal conditions modified due to thebehavior of building form and fabric, without
or with a little mechanical assistance
• Strategies for passive cooling
• Minimize heat gain, maximize heat removal to
avoid “overheating” in spaces and reduce or
eliminate ventilation and A/C energy uses
• Important elements
• Building envelope
• Other structural elements
• Ventilation strategy
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Passive cooling techniques
Passive cooling design factors
• Human thermal comfort
• Bioclimatic chart for analysis of climate and
human comfort
• Air movement• Radiation heat effect
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Passive cooling techniques
Bioclimatic chart
Source: Olgay
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Passive cooling techniques
Comfort zone on a psychrometric chart
P i li
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Passive cooling techniques
Bioclimatic analysis (Givoni)
y
P i li
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Passive cooling techniques
Passive cooling methods
• Comfort ventilation
9 Daytime
• Night ventilation for cooling
• Radiant cooling9 Using roofs or radiators
• Direct evaporative cooling
9 Cooling tower
• Indirect evaporative cooling
9 Roof ponds
• Soil or earth cooling
y
Passive cooling
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Passive cooling techniques
Use of ambient heat sinks
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t Passive cooling
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Passive cooling techniques
Night ventilation
y
t Passive cooling
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Passive cooling techniques
The radiant sky
The cooling function of the courtyard in hot arid climates
y
t Passive cooling
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Passive cooling techniques
“Skytherm” cooling system
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t Passive cooling
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Passive cooling techniques
Earth cooling
Underground dwellings at Matmata, Tunisia
y
n t Passive cooling
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Passive cooling techniques
Earth contact cooling system
Earth contact cooling system for a church in Normal, Illinois
ry
n t Passive cooling
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Passive cooling techniques
Effect of night ventilation
ry
n t Passive cooling
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Passive cooling techniques
Night ventilation & night sky radiation
ry
n t Passive cooling
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gtechniques
Direct & indirect evaporative coolers
ry
n t Passive cooling
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gtechniques
Radiative & evaporative cooling
ry
n t Passive cooling
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techniques
Evaporative cooler & dehumidifier
Ambient air
Dehumidifier
building
Ambient air
Evaporativecooler
building
Dehumidifier
Ambient air
Evaporativecooler
building
Dehumidifier
Ambient air
Evaporative cooler
Dehumidifier
Recirculation
Ambient air
Dehumidifier
Evaporative cooler
Dehumidifier
Recirculation
ry
n t Passive cooling
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techniques
Solar regenerated desiccant dehumidifier
ry
n t Passive cooling
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techniques
Air-to-air heat exchanger
ry
n t Passive cooling h
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techniques
Configuration of solar chimneys
try
en t Passive cooling
t h i
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techniques
Wind-induced pressure distribution
try
en t Passive cooling
t h i
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techniques
“La Sucka” ventilation terminal
Enhanced ridgesuction
try
en t Passive cooling
techniques
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techniques
Windowless night ventilator
try
en t Passive cooling
techniques
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techniques
Examples of passive cooling designs
try
en t Passive cooling
techniques
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techniques
Examples of passive cooling designs
try
en t Passive cooling
techniques
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techniques
Minimizing cooling demand first
• Solar protection is the most important factor in
warm climates
• Protecting building and its occupants from
solar heat and visual glare
• Some options for solar protection
• Building layout and orientation
• Window sizing, location and details
• Shading devices
• Colour of building envelope
• Vegetation near the building
try
en t Passive cooling
techniques
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techniques
Common shading strategies
• External projections
• overhangs
• External systems
• Louvers and screens• Special window glazing
• Reflective, low-e, etc.
• Internal systems
• Curtains and blinds
try
en t Passive cooling
techniques