En Fri Amien to Solar Pas Ivo

8/10/2019 En Fri Amien to Solar Pas Ivo

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OBJECTIVES

Learn about :The history of Passive Solar

Energy efficient design

Energy end uses

Passive Heating and Passive Cooling

Daylighting

Renewables


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The History of Passive Solar


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5thCentury BC Greece

Community Planning employed passive solar design.

Diminished fuel sources brought design changes.


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Passive Solar in Ancient Greece

Aristotle noted, builders made sure to

shelter the north side of the house to

keep out the cold winter winds.

And Socrates, who lived in a solar-

heated house, observed, "In houses

that look toward the south, the sunpenetrates the portico in winter"

which keeps the house heated in

winter.


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Cross section of a Roman heliocaminus.

The term means "sun furnace."


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Roman heliocaminus

The Romans used the term to describe

their south-facing rooms. They became

much hotter in winter than similarly

oriented Greek homes because theRomans covered thei r window

spaces w i th m ica or g lass while the

Greeks did not.

S l G h


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Solar Greenhousesfrom Ancient Rome to 18thCentury

Europe

Canvas covered the glass in the evenings to hold in heat.

With the fall of the Roman Empire, so too came the collapse

of glass for centuries in either buildings or greenhouses.


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19thCentury Solar Remodel

with attached greenhouse


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Heritage:

Anastasi Indians


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Southwest AdobeOrientation, control & thermal mass


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Adobe = Thermal Mass


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The colonial "salt box" house, typical of

New England architecture of the 18th

century.


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Maximizes Southern Exposure


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Village Homes subdivision built in the

late 1970s in Davis, California. The

layout of the subdivision allowed everyhouse to face the winter sun.


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Today


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Generation and use of energy

(electric, gas, oil, coal) are major

contributors to air pollution andglobal climate change.


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And pollution of our

rivers.

MOUNTAIN TOP REMOVAL


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Improving energy efficiency and using

renewable energy sources are effective

ways to improve air quality and reducethe impacts of global warming


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Energy efficiency is a cornerstone of

any green building project.


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Passive Solar Design

The 47-degree difference in the altitude

of the sun at solar noon between winter

and summer forms the basis of passive

solar design.

Passive solar building design revolves

around 5 main aspects;


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Aperature: The set of windows and overhangs

that determine how much sun enters the

building. Absorber: The material that the suns ray come

into contact with.

Thermal Mass: The material that stores the

suns thermal energy for re-release aftersundown.

Dist r ibut ion: The means by which the thermal

energy is released to the living/working spaces. Cont ro l: The techniques used to control the

collection and distribution of the sun's thermal

energy.


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Design Aspects:


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Passive Solar Design

Themes: Direct Gain: Sunlight shines into and

warms the living space.

Indirect Gain: Sunlight warms thermal

storage, which then warms the livingspace.

Isolated Gain: Sunlight warms another

room (sunroom) and convection bringsthe warmed air into the living space.

P i S l H t


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Passive Solar Heat

Passive solar design can reduce heating

temperatures by 30-50% Windows need to be incorporated within

30 degrees of due south


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indirect gain systems

In the indirect gain, a storage mass

collects and stores heat directly from

the sun and then transfers heat to the

interior space. There are several indirect

gain passive solar systems :


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Indirect Gain Water Wall


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Trombe Wall


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Isolated Gain Space:

Sunroom


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Passive Solar Design Aspects


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PASSIVE COOLINGPlant deciduous trees for shade

Natural ventilation is a key cooling strategy

Install window overhangs and awnings


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Deciduous Shade Trees

Primarily shade windows and paved areas Keep trees an appropriate distance from the

house and utility lines


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Shade trees can reduce summer

air-conditioning costs by 25 40%.


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Trees can create a microclimatethat is up to 15 degrees cooler

than the surrounding area.


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Trees also clean the air, create habitat and

play areas for children as well as add

aesthetic beauty to the neighborhood.


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Overhang and Awnings

Overhangs are important parts of


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Overhangs are important parts of

passive solar heating and natural

cooling.

O


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Awnings and Overhangs

Help keep the heat of the sun out


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Help keep the heat of the sun outduring the summer.

W d t lli


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Wood trellises

Arbors


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Arbors


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Adjustable or demountable

awnings made of fabric or metal

All h t t t d i th i t


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Allow heat to enter during the winter.


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DAYLIGHTING

What is Daylighting?

Energy Savings

Productivity, Health and Well Being


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This?


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Or This?


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Cl Wi d


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Clerestory Windows

Modeling with the Heliodon


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Modeling with the Heliodon

Heliodon at PG&E Energy


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Heliodon at PG&E EnergyCenter

Daylight modeling with


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Daylight modeling withHeliodon

Daylight after construction

Daylighting Saves Energy


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Daylighting Saves Energy

and Improves Productivity


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Deck Mounted Skylight


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Sun tracking systems

Sk li ht


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Skylights


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Solar Tubes:


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Solar Tubes:

Inexpensive, Easy to install


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And very effective


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And very effective


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REVIEW OBJECTIVES Learn about :

The history of Passive SolarEnergy efficient design

Passive Heating

Passive CoolingDaylighting


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En Fri Amien to Solar Pas Ivo

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