Effects of Solar Passive Architecture on Building Envelop

International Journal of Trend in Scientific Research and Development (IJTSRD)
Volume 4 Issue 4, June 2020 Available Online: www.ijtsrd.com e-ISSN: 2456 – 6470
@ IJTSRD | Unique Paper ID – IJTSRD31672 | Volume – 4 | Issue – 4 | May-June 2020 Page 1660
Effects of Solar Passive Architecture on Building Envelop
Ar. Apoorva Ajmera
(B. Arch., PGP ACM, PGDUPDL, GRIHA CP)
Assistant Professor, Buddha Institute of Architecture and Town Planning, Udaipur, Rajasthan, India
ABSTRACT
In different parts of the world, man has found various solutions for protection
against climatically unkind conditions through locally availablematerials.For
example, in the hot and humid regions of Asia, Indonesia, Polynesia and
Amazon, the roof was more important than the walls for modifyingtheindoor
conditions. In fact the walls could be omitted altogether. Hence, lightweight
structures of timber skeleton, wooden frames, thatched roofs andwoven,lath
and venture walling were used in such regions. On the other hand, in the
mountainous cold forest regions in the North West U.S.A., Scandinavia and
Himalayas, one found well-insulated timber houses.
In the case of vernacular architecture,theroofplayeda determiningroleinthe
general form and appearance. Flat roofsappearedinhotregions,vaultedroofs
in hot and dry regions and inclined roofs in temperate-dry climates. Higher
pitched roofs were used in wet-temperate and cooler places. Both domes and
vaults were popular in the hot arid regions of the Middle East and Northern
Africa, where low humidity leads to intense radiation exchange, and the
variations between day and night temperatures are high. The logic here
(probably deduced from centuries of experience) is thata hemispherical vault
has about three times the surface area as the base of a square roof,sothesolar
radiation is diluted to that extent. Also, the cooling by radiation exchanges to
the night sky is faster.
In the proto-historic period, community-basedcollectivehouseformsevolved.
Bio-climatic aspects such as orientation, house form, open spaces, etc. were
well integrated in vernacular residential architecture.
KEYWORDS: Building envelop, orientation, thermal storage, solar passive
How to cite this paper: Ar. Apoorva
Ajmera "Effects of Solar Passive
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1. INTRODUCTION
India experiences diverse climatic conditions which in turn
have influenced the development of vernacular architecture
in various regions. Control of the microclimate around the
building was always an important aspect of indigenous
designs. The urban forms ensured that individual buildings
were not exposed to the sun. While planning a town, care
was taken to orient the streets keeping the effects ofsunand
wind in mind. For example, towns in Gujarat and Rajasthan
which experience hot and dry climate, had row-houses with
common walls. These were tightly packed along the streets
and plains to minimize the exposure to direct sun and hot
winds. The front facades were further shaded with well-
articulated balconies called “Jharokhas”. Air inlets were
usually located on the front facades where the air was
relatively cooler since the streets and the lanes were well-
shaded. Each house had an open courtyard whichactedasan
exhaust for warm air and provided enough natural light for
the interior of the house. It has been recorded in the case of
Jaisalmer, e.g., that the maximum temperature within the
town was always lower than that recorded outside. Another
important factor in building was the willingness and the
ability of the user to organize his daily activity in space and
time so that not all spaces required to bemaintainedatequal
levels of comfort all the time. At any given time, the active
use of the building could be restricted to the areas most
comfortable at that time.
CLIMATE
Climate, the word is derived from Greek, word KLIMA and is
defined by Oxford Dictionary as region with certain
conditions of temperature, dryness, wind, light etc. A
somewhat more scientific approachtowardsthedefinitionis
integration in time of physical states of the atmospheric
environment, characteristics of a certain geographic
location.”
The ‘climate’ of a region is determined by the pattern of
variations of several elements, when human comfort and
building design are being considered are:
Solar radiation
Ambient air temperature
Air humidity
Precipitation
Wind
Sky conditions
2. SOLAR GEOMETRY
Sunlight falling on building raises indoor temperatures in
two different ways when incident solar radiation (or
isolation) fall on the external envelop of a building the
energy is absorbed increases the surface temperatures
which in turns causes heat to be conducted inward through
walls and roof. But when solar radiation falls on window,
almost all of the energy passed directly through the glass
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into the interior where it becomes trapped by a process
called greenhouse effect. During cold weather this isolation
is a variable free source of heat, but when interior
temperatures are out of comfort range, it only adds to the
occupant's discomfort.
Green House Effect
Glass, which allow virtually all the visible solar radiation
striking its surface to pass through, will absorb most of the
thermal (infrared or long wavelength) radiation it intercept
this property of glass is highly desirable for use in collecting
solar energy. Once sunlightistransmittedthroughglass.This
process of trapping heat iscommonlyknownasGreenHouse
Effect.
This does not imply that radiation losses from a space are
eliminated although glass does not transmit thermal
radiation; it absorbed this energy and then re-radiates and
conducts it to the outside, but at the lower temperature of
the glass surface.
From our daily experience we know that the sun appears to
move across the sky from easterly to a westerly direction
and that the path of this diurnal motion is longer is summer
than in winter. Knowledge of sun's path in the sky on
prerequisite for the calculation of solar radiation and in the
design of solar control devices.
In order to design buildings, which precisely respond to
direct radiation, the sun's position for any time of any day of
the any year for any location throughouttheworldshould be
very clear in the designer's mind.
In fact the earth not only revolves aroundthesuneveryyear,
but it also rotates about its axis once in every 24 hour. One
other important fact is that axis 0 the earth made 23o
27'angle to the plane in which it orbits the sun.
The earth is divided into 360 o longitudes & 180o latitudes
that major latitudes is the diameter of earth and is known as
equatorial line lie in Northern hemisphere. In order to
understand sun so the sun motion is symmetrical about the
equatorial line.
Summer & Winter Solstice
The earth orbits the sun, its axis at may remain tipped in the
same direction, pointing towardsPolaris,thedistant"North"
star. It means that at one point in the orbit theaxisleanaway
from the sun and the opposite point half a year later, theaxis
is tipped towards the sun. These times are known as the
winter solstice and summer solstice.
To develop the solar chart there should be a clear visual
understanding of sun's movement across the skydome, two
coordinates are needed to locate the position of sun in the
sky which are called the attitude is the angle measured bet"
the horizon and the position of sun above the horizon. The
concentric circular / horizontal line on the chart represent
attitude angles.
3. Building Orientation
Orientation refers to the location of a building with respect
to the cardinal directions, i.e. North-South and East-West.
Building orientation is an important parameter of design. In
cold climates, the building needs to be oriented such the
solar radiation is admitted to the maximum possible, while
the reverse is true of hot regions. Similarly winds can be
desirable or unwanted. Dependingontheclimate.Sometime
a compromise is required between these twoorientations.It
is seen that cooling load is the highest when the longer side
of the building face East-West i.e. 0-180o C. To decide on an
optimum orientation, it is essential to have an idea of the
sun's position and its movement pattern on a diurnal aswell
as seasonal basis.
Plan form
The planform of the building affects the amount of solar
radiation received by the building and the airflow around it.
Therefore it plays an important role in ventilation and heat
loss or gain.
Wind when obstructed by a building creates pressure
differences, i.e. positive pressure on the windward side and
negative pressure on the leeward side. Consequently, a new
airflow pattern is established around the building.
Appropriate openings connecting hightolowpressureareas
provide effective ventilation.
The surface to volume ration determines the magnitudes of
heat transfer in buildings. The larger the S/V ratio, the
greater the heat gain/loss for a given volume of space.
Conversely, a smaller S/V ratio will result in the reductionof
heat gain/loss. For example, in cold climates it is preferable
to have compact house form with minimum S/V ratio.
4. Building Envelope
The nature of the building envelope determines the amount
of radiation and wind that will enter inside. It consists of the
following elements.
Roof
Walls
Fenestrations
External color and texture
Shading
A. Roof: Since roof receives a significant amount of Solar
radiation, the type of roof plays an important role in
modifying heat gain or loss, day lighting and ventilation.
A massive roof as of reinforced cement concrete (RCC)
tends to delay the transmission of heat into the interior
when compared to lighter roofssuchasasbestoscement
sheet roofing. Sometimes inverted earthen pots with a
layer of a earth also cover the roof over them. The earth
and the inside the pots provide good insulation for
resisting heat gain. A doubly pitched or curved roof
provides a larger surface area for heat loss compared to
a flat roof. Thus, the shape as well as the material both,
has an effect on the performance of the roof. The roof
can also be used advantageouslyforeffectiveventilation
and day-lighting by incorporating vents and skylights
respectively.
B. Walls: - Walls constitute a major part of the building
envelope and receive a large amount of direct radiation.
Depending on weather the needisforheatingorcooling,
variations in the thickness and material of the wall can
be decided on. For example, it is estimated that more
than 25% of the heat gain occurs due to conduction by
walls in the warmer regions of India. Hence, control of
heat gain through walls must be an important

consideration for reducing the cooling loads. In the case
of an air-conditioned building, a wall-type with a low U-
value.
C. Fenestration (openings):- The patterns and
configuration of openings such as window forms an
important aspect of climatic design. These are provided
for the purpose of heat gain, day-lighting and
ventilation. Appropriate design ofopeningsandshading
devices help to keep out sun and wind or allow them in
building. Ventilation lets in the fresh air and exhausthot
room air, resulting in cooling. An indoor speed of 1.5 -
2.0 m/s can cause comfort in warm and humid regions
where the outdoor maximum air temperature dose not
exceed 28 - 32o C compared to out of the outdoor.
While deciding upon the positionofa window,itisnecessary
to keep in mind the tendency of hot air to rise. Openings at
higher levels would naturally aid inventing the hot air out.
The size, shape and orientation of the windward side,
permitting well cross-ventilation of interior space. Also, a
small inlet as large outlet increases velocity and distribution
of airflow through the room.
Natural light is introduced into the building through glazed
openings, skylight, light shelves, clerestories, etc. Providing
openable shutters and movable covers like curtains or
Venetian blinds can control the extent of light and glare that
enters. Besides, glazing of various tints or glazing with
surface coatings can be used to control solar transmission,
absorption and reflection characteristics. For example: the
direct transmission of solar radiation through an absorbing
glass can be reduced to as low as 45%. Coatingtheglasswith
a layer of reflective material usually makes reflective glass.
Depending on whether the coating is on the outer or inner
face of the glass, the reflectivity could vary.
It may be mentioned that window admit direct solar
radiation and hence promote heat gain. This is desirable in
cold climates, bit it is critical in overheated climates. The
window size should be kept minimum in the Hot and Dry
regions.
D. External color and texture: - The nature of the
external surface finish determines the amount of heat
absorbed or reflected but it. A smooth and light-colored.
Surface reflects more heat and light; a rough textured
surface causes self-shading and increases the area for
re-radiation. White or lighter shades have higher
emissivity, therefore are ideally used for reducing heat
gain in warmer climates. Moreover, a heavy texture on
these light-colored surfaces helps to reduce the glare.
Dark colors absorb moreradiation,whichincreasesheat
gain through the surface and can be used in cooler
regions. It is seen that in all cities (Ahmedabad,Mumbai,
Nagpur and Pune), a white painted surface outdoes all
other colors in terms of lowering the room
temperatures.
E. Shading:- Shading devices block the solar radiation
incident on the exposed surfaces of a building,
consequently reducing heat gain.
In the case of Hot and Dry regions, taller structures may be
placed towards south. So as to shade other structures in a
cluster. Walls can be shaded by the use of projections,
balconies, fins, textured paints, vegetation, etc.openingscan
be shaded with appropriately sized chajjas,finsandawnings
externally, and / or by using openable shutters and movable
covers like curtains, Venetian blinds, etc. internally a
schedule representation of the various types of shading
devices.
Since the roof of the building receives the maximum amount
of radiation shading it reduces the heat gain. Using movable
canvas covers, plant cover, roof garden, etc can do this.
Advance solar passive techniques: - in addition to the
simple features of solar passive architecture, there are a
number of advance passive techniques that can be
incorporated in buildings. A brief discussion of these
techniques is as follows.
Direct Gain:-
Direct gain is a passive heating technique generally used in
cold climates. It the most common, simple, cheap and
effective approach. The basis principle of that sunlight is
admitted into the living spaces, directly throughopeningsor
glazed windows, to heat the walls and floors andthereby the
air inside. The requirements of a direct gain system are
glazed windows and thermal storage. The glazed windows
are generally located facing south to receive maximum
sunlight during winter. They are generally double glazed
with insulating curtains, to reduce heat loss during
nighttime.
During the day, affected part of the house tends to get very
hot, and hence, thermal storage mass is providedintheform
of bare massive walls or floors of either masonry. Concrete
or water-filled drums to arrest the increase in room
temperature. The heat thus stored is released during night
for space heating. It may be noted that carpets / curtai9ns
should not be used to cover floors/walls used for storage
purpose. Then, the heat flow into or out of the storage is
prohibited. A suitable overhangmaybeprovidedforshading
from the summer sun to avoid undesired heating.
Because of its simplicity and effectiveness, direct gain
features are used extensively for heating purpose in cold
climates. For example, clerestories used in a restaurant in a
New Mexico, USA can maintain an indoor temperature of
about 15o C as compared to outside temperature of 1.0oC.
Variations and Controls
Variations occur due to storage and glazing materials, and
their locations in buildings. Thermal storage materials can
be concrete, bricks, stone or water in containers. The
thermal mass is typically located in the external or internal
walls, floors, erected independent structures, etc. that
receive direct sun.
Glazing materials may be glass indifferentlayersandlocated
in the wall or roof so that radiation falls directly on the
thermal storage mass. Various forms of opening like
clerestories can achieve direct gain.Skylight,greenhousesor
glass curtain walls designed for the required heating. The
color of internal surfaces also plays an important role in
absorbing the radiation, as well as in the distribution of
daylight. Darker colors absorb moreheatthanlightershades
as pointed out earlier. As far as the distribution of light is
concerned, the lighter shadesarepreferred. Thusthestorage

surface should be of medium-dark colour, whereas
lightweight materials should have colour to reflect sunlight
on the masonry walls or floors.
The direct gain system with its large glazed area andstorage
facilities could result in undesirable winter losses and
summer overheating. Various controls such as roof
overhangs, shutters and reflectors can be used for
decreasing or increasing the solar heat gain, exhaust and
vents can be employed to cool the interior spaces through
ventilation when the summer temperature rises.
Remarks:
While the main advantage of the direct gain approach is its
simplicity and low cost, it causes large temperature swing
because of large variations in the input of energy in the
room. Strong directional daylighting, glare and ultraviolet
degradation of the house material are some of the
disadvantages of direct gain system. In spite of these facts,
this is by far the most common system in the world since the
approach is relatively simple and inexpensive.
5. Thermal Storage Wall:-
In this approach, a thermal storage wall is placed between
the living space and the glazing.Thispreventssolarradiation
from directly entering the living space; it is absorbed by the
storage and then transferred into the living space. Such a
feature is mainly used for heating buildings. Different types
of storage walls are:
A. Trombe Wall
A trombe wall is a very solid wall with vents provided at
both upper and lower parts, it is a massive thermal storage
wall made of concrete. Masonry or composites of bricks,
block and sand, usually located on the south side of a
building to receive maximum solar radiation. The wall is
painted black to increase its absorptive capacity and isplace
directly behind glazing with air gap between vents are
provided fir air circulation.
Solar radiation is absorbed by the blackened surface and is
stored as sensible heat in the wall. Air, in the space between
the glazing and the wall gets heated up and enters the living
room through the upper vents. Cool room air takes its place
through the lower vents. Thus establishing a natural
circulation pattern. A part of the absorbed heat is conducted
through the wall and is transferred to the living space by
convection and radiation. Thus, the living space gets heated
up. During summer months, when the sun's altitude is high.
The overhang on the all cuts off direct sunshine. Further,the
Trombe wall can provide induced ventilation for summer
cooling of the space. Here the heated air in the collector
space flows out through exhaust vents at the top of theouter
glazing, and air from outside enters the space through
openings on the cooler side to replace the hot air . This
continuous air movement cools the living space. It is
noteworthy that in buildings withthermal storagewalls,The
indoor temperature can be maintained at about 15o C while
outside temperature is as low as 11o C.
Generally, the thickness of storage wall is between 200-
400mm; the air gap between the wall and the glazing is 50-
150mm and the total area of each row vents is about 1% of
the storage wall area.
Variation and controls
The distribution of heat into the living space can be almost
immediate or delayed depending on air circulation.
Furthermore, the delay can be varied depending on the
thickness of the wall, and the time-lag property of the wall
material.
If the vents are provided with dampers, the airflow can be
controlled. Use of movable insulationintheformofa curtain,
between the wall and the glazing provides another mode of
control.
Materials which can store and release heat when they
undergo a phase change between liquid and solid are called
'phase change materials' (PCM). They can be used asstorage
materials for thermal storage wall, as PCM have a greater
ability to store and release heat when they undergo a phase
change. Also for a given amount of heat storage, the phase
change materials require less space than any sensible
storage and are much lighter in weight.
They are therefore, convenient to make use of for retrofit of
buildings.
Commonly used PCMS are hydrated and hydrocarbons. Of
the hydrocarbons, paraffin wax has been very popular in
building applications. Also used are (a) mixture of stearic
acid, paraffin (80%) and mineral oil, and (b) sodium
decahydrate. While hydrate salts are inexpensive and can
store more heat than a hydrocarbon, their properties
degrade with prolonged use; they are also corrosive. On the
other hand, hydrocarbons are flammableand requirecareful
handling.
B. Water Wall
Water wall are based on the same principle as that of the
Trombe wall, except that they employ after as the thermal
storage material. A water wall isa thermal storagewall made
up of drums of water stacked up behind glazing. It is painted
black externally to increase the absorption of radiation. The
internal surface can be painted with any other color,and can
be in contact with the interior space directly or separated by
a thin concrete wall or insulating layer. Since storage in the
water wall is a convective body of mass, the heat transfer is
very rapid in comparison to the masonry wall.
Variations and control:
A large volume provides longer andgreaterstoragecapacity,
while smaller units enable faster distribution. A variety of
containers like tin cans, bottles, tubes, bins, barrels, drums
etc., provide different heat-exchange surfaces to the storage
mass ration.
Heat transfer through water wall is much faster than that of
Trombe wall. So the control ondistributionofheatisneeded,
if it is not immediately necessary for the building. This can
be effected by using thin concrete layer orinsulatinglayeror
by providing air circulation through vents. The buildings,
which work during the daytime, like schools or government
offices benefit from the rapid heat, transfer in water wall.
Using movable overhangs may prevent overheating during
summer.
C. Solar chimney assisted passive heating device :
This is an example of passive heating system in which the
thermal storage wall is separated from the glazing. This

system can be identified as a modified Trombe wall, and be
incorporated as part of the roof. The system consists of a
solar chimney and a thermal storage unit. A solar chimney is
essentially a collector panel with minimum thermal inertia
on the south face of the building. Itabsorbstheincidentsolar
radiation and heats up the air in the absorber glazing space.
A well insulated collector limits the heat loss to the outside.
The hot air forces itself into the living space through vents,
and heats it up. Cooler air takes its place and the cycle is
repeated. In addition to heating the space, heat can also be
stored for later use bypassing the hot air through storage
mass.
The storage is generally the inter structure of the building
like an internal wall and/or a concrete ceiling which is not
exposed to the outside. Thereby, the internal storage
minimizes the heat loss to the outside. Besides, during
evening and night hours, the well insulated collector serves
as a thermal buffer between the house and the external
atmosphere and eliminates the need for movable insulation.
Variations and controls:
Dampers can be used to control the airflow either to the
storage unit or directly into the living space. The thermal
storage may be suitable designed to realise a desired time
lag for the distribution of heat to the living space. The
potential of the system to induce ventilation for summer
cooling can be realised by venting out the hot air and
providing another opening for replacing the hot air by cool
air from shaded or cooler area.
D. Transwall
Transwall is a thermal storage wall that is semitransparent
in nature and is directly located behind the south facing
glazing. It partly absorbs and partly transmits the solar
radiation. The transmitted radiation causes direct heating
and illumination of the living space. The absorbed heat is
transferred to the living space at a later time. The heat loss
through the glazing is low, as much of the heat is deposited
at the center of the Transwall ensuring that its exterior
surface does not become too hot. Thus the system combines
the attractive features of both direct gain and Trombe wall
system.
A Trombe wall has three main components:
1. Container made of parallel glass wall set in metal frame.
2. Thermal storage liquid , which is generally water.
3. A partially absorbing plate, set at the center of the
Transwall, parallel to the glass walls.
These modules are stacked to from a wall on the south side
of the building, located directly behind double-glazing. To
prevent the growth of microorganisms in the storage, an
inhibiting agent may be added.
The hydrostatic pressure exerted by the liquid dictates the
dimensions of the storage module. Also important are the
consideration of transportation, the method of installation,
the ways of filling and drainingthemodule,andattachingthe
modules to each other and integrating with the building.
Storage being a convective bodyofwater,thetransferofheat
is rapid. This can be regulated by providing baffles and
adding a gelling compound. Baffles are transparent plates,
which connect the module walls with the absorbing plate
and prevent water movement. The geling compound
increases the general flow resistance.
E. Thermal storage Roof / Roof pond / Skythern
A roof pond system works well both in summer as well as in
winter. While it is mostly appropriate for cooling, for winter
heating purpose it is better suited to lower latitudes with
high winter sun.
In this system, a mass of water is stored on the roof of the
building. During summer days, the pond is protected and
insulated by an external, movable and reflective insulation.
The insulation prevents solar radiation from reaching the
water mass and keeps it cool. This cool water then absorbs
heat from the rooms below and cools the air inside. At night
the insulation is removed and the water cools by convection
and radiation. The effectiveness of the roof pond may be
gauged from the fact that an indoor temperature of21oCcan
be maintained when the outside temperature is as high as
35o C.
In winter, the panel positions are reversed. During the day
the insulation is removed so that heat is absorbed by water
for heating the interior. During the night, the insulation
cover reduces the heat loss. The effectiveness of the roof
pond in winter in no less than in summer; indoor
temperature can be maintained at about 21o C while the
outside is as low as - 11o C.
Water in transparent bags /in waterproof structural
metal/fiberglass tanks is kept on the roof, the depth ranging
from 150 to 300 mm. The top of the container/bag needs to
be transparent to solar radiation whereas it bottom (inside
surface) should be made of dark color. If both sides of the
container are transparent, the top surface of the roof needs
to be blackened for absorbing solarradiation.Acleartop and
black bottom helps in minimizing temperature stratification
in the pond water. Otherwise hot water at thetop wouldlose
its heat to the exterior, and the cold water at the bottom
would inhibit the heat transfer to the interiorofthe building.
The movable insulation is usually of 50.. Thick polyurethane
foam reinforced with fiberglass strands and sandwiched
between aluminum skins. The waterproofing layer of the
roof should be such that the heat transfer from the pond to
the interior is not inhibited. Radiation is responsible for the
thermal interaction between the roof and living space.
Therefore the ceiling of the room must not be very high, as
the intensity of the radiation reduces with the height or
distance. This technique is effective for one or two storied
buildings.
Variations may be achieved by altering the ratios of heat
transfer surfaces to thermal mass. The large the storage
volume, the grater and longer the heat storage. Smaller
containers provide greater heatexchangeasthesurfacearea
increases, resulting in faster distribution. During winter, a
transparent cover may be provided over the water bags
leaving a gap. Air is blown through these gaps forming an
insulation cover to reduce heat loss. During summer these
gaps are flooded with water and the transparent cover is
removed.

6. CONCLUSION
Passive Solar Design is a simple, highly effective (and cost-
effective) method of making buildings more energy efficient
by using natural systems to help keep them warm in the
winter and cool in the summer. Whenall oftheprinciples are
applied correctly in a holistic way it leads to buildings that
are full of light and sunshine in the winter, cool and shady in
the summer and cost very little to operate throughout their
lifespan.
A basic ability to understand passive design strategies in
general including the approaches and beneﬁts of using such
strategies not only in the building design but also related to
the urban context and human factors. The key to designinga
passive building is to take advantage of the local climate
(microclimate) and therefore, climate characteristics and
classiﬁcation can help with identifying approaches as early
as site planning and analysis. Therefore,climateandcomfort
are the two fundamental measures in passive design that
require attention. Passive design is a major part of
environmental design and its approaches utilising several
techniques and strategies that can be employed to achieve
sustainable design also enhanced by patterns of biophilic
design for improving health and well-being in the built
environment.
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