Solar Passive Techniques

8/10/2019 Solar Passive Techniques

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SOLAR PASSIVE TECHNIQUESName :- Deepali BafnaRoll No.:- 2012BARX1005

School Of Planning And Architecture

Submitted To :- AR. MANISH SIR


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WHAT DO I MEAN BY SOLAR

PASSIVE TECHNIQUES ??

In passive solar building design,

windows, walls, and floors are made to

collect, store, and distribute solar energy

in the form of heat in the winter and reject

solar heat in the summer.

The key to designing a passive solar

building is to best take advantage of thelocal climate.
http://en.wikipedia.org/wiki/Solar_energyhttp://en.wikipedia.org/wiki/Climatehttp://en.wikipedia.org/wiki/Climatehttp://en.wikipedia.org/wiki/Solar_energy


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ELEMENTS INCLUDED

Window placement

and glazing type

Thermal insulation

Thermal mass

Shading


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ACTIVE AND PASSIVE SOLAR SYSTEMS ARE USED IN THESOLAR UMBRELLA HOUSE TO ACHIEVE NEARLY 100% ENERGYNEUTRALITY .


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TYPES

TROMBE WALL

CAVITY WALL

WATER WALL SOLAR CHIMNEY


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TROMBE WALL

A wall is built on the winter sun side of a

building with a glass external layer and a high

mass internal layer separated by a layer of

air. Trombe walls work on the basic greenhouse

principle that heat from the sun in the form of

near-visible shorter-wavelength higher-energy ultraviolet radiation passes through

glass largely unimpeded.


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http://en.wikipedia.org/wiki/File:Trombe_wall.jpg


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1)Air flow in trombe wall

2) A northern hemisphere

trombe wall
http://en.wikipedia.org/wiki/File:Rammed_earth.jpghttp://en.wikipedia.org/wiki/File:Trombe_Wall_flow.png


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CAVITY WALL

Cavity wallsconsist of two 'skins' separated

by a hollow space (cavity).

.The skins are commonly masonry such as

brick or concrete block. Masonry is anabsorbent material, and therefore will slowly

draw rainwater or even humidity into the wall.

. The cavity serves as a way to drain this waterback out through weep holes at the base of

the wall system or above windows.


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THE SCIENCE OF CAVITY

INSULATION

The reason cavity insulation keeps heat in

is that the polymer and air in the cavity are

good insulators. This is because the

distance between the particles in the air isgreater than in a solid. Other benefits of

cavity walls are their resistance to

moisture from the outer side to the innerwall and the increase of sound proofing.


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WATER WALL

Water wall passive solar buildings are

usually the most attractive type of passive

solar home. The key element for a passive

solar home is thermal mass and waterprovides this mass at a lower cost than

either concrete or phase change salts.


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REASONS WE SHOULD

USE WATER WALL They can be installed in new construction easily and economically

They are more effective than masonry for heating and cooling,particularly in areas with cool night temperatures.

They are more flexible than phase change storage because theywork for cooling as well as heating, and don't have a critical

working temperature They can be easily disguised to become practically invisible .

They can be smaller than an equivalent masonry wall, avoidingthe claustrophobic sensation of full masonry walls .

They are extremely comfortable because of the large radiant

surface exposed to the inside In many cases they can be retrofitted economically and easily.


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Solar chimney

A solar chimneyoften referred to as athermal chimneyis a way of improvingthe natural ventilationof buildingsby using

convectionof airheated by passive solarenergy.

A simple description of a solar chimney isthat of a vertical shaft utilizing solar energyto enhance the natural stack ventilationthrough a building.
http://en.wikipedia.org/wiki/Ventilation_(architecture)http://en.wikipedia.org/wiki/Buildinghttp://en.wikipedia.org/wiki/Convectionhttp://en.wikipedia.org/wiki/Airhttp://en.wikipedia.org/wiki/Passive_solarhttp://en.wikipedia.org/wiki/Energyhttp://en.wikipedia.org/wiki/Natural_ventilationhttp://en.wikipedia.org/wiki/Natural_ventilationhttp://en.wikipedia.org/wiki/Energyhttp://en.wikipedia.org/wiki/Passive_solarhttp://en.wikipedia.org/wiki/Airhttp://en.wikipedia.org/wiki/Convectionhttp://en.wikipedia.org/wiki/Buildinghttp://en.wikipedia.org/wiki/Ventilation_(architecture)


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THE BASIC DESIGN

The solar collector area: This can be located in thetop part of the chimney or can include the entireshaft. The orientation, type of glazing, insulationand thermal properties of this element are crucial

for harnessing, retaining and utilizing solar gains The main ventilation shaft: The location, height,

cross section and the thermal properties of thisstructure are also very important.

The inlet and outlet air apertures: The sizes,location as well as aerodynamic aspects of theseelements are also significant


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http://en.wikipedia.org/wiki/File:Solarchimney.jpg


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CAD(TAS) SOLAR

CHIMNEY MODEL
http://en.wikipedia.org/wiki/File:Solar_chimney_TAS_model.jpg


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POSITIVE ASPECTS

Reduced reliance on wind and wind drivenventilation

Improved control of air flow though a building

Greater choice Improved ventilation rates on still,

hot days of air intake (i.e. leeward side of building)

Improved air quality and reduced noise levels inurban areas

Increased night time ventilation rates Allow ventilation of narrow, small spaces with

minimal exposure to external elements


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THANK YOU

-BY DEEPALI BAFNA

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Solar Passive Techniques