Passive Cooling and Vernacularism in Mughal Buildings in North India: A Source of Inspiration for Sustainable Development

2013 International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies.

International Transaction Journal of Engineering,
Management, & Applied Sciences & Technologies
http://TuEngr.com, http://go.to/Research

Passive Cooling and Vernacularism in Mughal
Buildings in North India: A Source of Inspiration for
Sustainable Development
a*
Asif Ali

a
Architecture Section (University Polytechnic), Aigarh Muslim University, INDIA

ARTICLEINFO A B S T RA C T
Article history: In the present time, scrupulous use of energy is a
Received 24 April 2012
Received in revised form 14 challenge for the world population. The natural resources of
September 2012 energy are depleting day by day and the present resources seem
Accepted 09 October 2012 inadequate to fulfill the need of human beings in future. Global
Available online 12 October 2012
warming and depletion of fossil fuels pose the dual crisis for
Keywords:
sustainability. The building sector, being a major consumer of
Energy efficient buildings;
Passive cooling; energy necessitates a critical scrutiny on this aspect. The
Vernacularism; techniques used for cooling, heating and ventilation of the
Mughal architecture. buildings in the past were more harmonious with the nature. Use
of locally available resources for design of historical buildings
was energy efficient. The passive cooling in historical buildings
provides a source of inspiration for sustainable development in
contemporary world. In this paper, the author has examined
various passive cooling techniques and locally available
resources used in Mughal buildings in North India. The design
elements of these buildings have evaluated on the basis of their
suitability to the climate. The findings of this study suggest
further research to explore guidelines for designing energy
efficient buildings for sustainable development in the present era
and future world.

2013 International Transaction Journal of Engineering, Management, &
Applied Sciences & Technologies.

*Corresponding author (Asif Ali). Tel +91-983-755-1661 E-mail address.
asifarchitect@rediffmail.com. 2013 International Transaction Journal of Engineering,
Management, & Applied Sciences & Technologies. Volume 4 No.1 ISSN 2228-9860 15
eISSN 1906-9642. Online Available at http://TuEngr.com/V04/015-027.pdf

1. Introduction
With the arrival of Muslims in India, from twelfth century AD onwards, the merger of
local and immigrated architectural techniques resulted into an astounding style. In the same
way, their passive cooling techniques in buildings were merged together to provide new ways
to cope with the extremes of the climate. The process of emergence of newer methods was
continued for the next seven centuries leading to the development of several meaningful
passive cooling techniques in buildings. Later, the industrial revolution influenced the globe
and a population explosion in urban areas took place. These two factors promoted the use of
non-renewable materials and high energy consumption in the building industry. In the absence
of mechanical equipments, our ancestors designed and developed comfortable places with a
little expenditure on energy. Unlike modern approach of making building’s internal
environment cool or warm, the intention was to give thermal comfort to the people with or
without the building. In comparison to the historical buildings, our present day buildings are
consuming more energy and resulting less comfortable habitation (Sundarraja et al., 2009).
Most of the modern building materials consume a considerable amount of energy even at the
time of their manufacture itself. Modern architects are merely thinking about lowering down
the temperature of internal spaces while historical buildings were designed by keeping in
mind the comfort ability of the users.

Different building technologies reflect the amount of energy consumed during
construction and their use. Artificial control of environment in buildings leads to the
requirement of substantial amount of energy. The buildings consume natural energy in three
ways (Gupta, 1988).
i) Maintaining the internal environment of spaces to make them comfortable.
ii) Controlling the microclimate.
iii) Procuring and manufacturing of materials for construction.

The above mentioned areas of energy requirements should be handled carefully to
maintain sustainability. The response to these issues up to a certain extent can be observed in
Mughal buildings. With the examples of few major projects of Mughal period in North India,
this study deals with the exploration of principles evolved in Mughal buildings to make the
building naturally cool which may inspire architects and planners to develop sustainable cities
in the future.

16 Asif Ali

2. Climatic characteristics
Before discussing the tools of passive cooling techniques used by Mughals, it would be
pertinent to have some idea of the climate prevailing in North India. Composite climate
occurs in most of the areas ruled by Mughals in North India which is characterized by
dominated hot and dry conditions two third of the year and, a somewhat cold and a warm
humid season occur in the remaining one third of the year. Being sufficiently far from the
equator, this region experiences clear seasonal changes in solar radiations and wind
directions. The remarkable mean diurnal changes may be observed from 11-12° C in hot dry
and cool dry seasons while this range narrows up to 3-6° C in warm humid season. Relative
humidity reaches up to 95% during the wet period. There is little or no rain during dry season.
Hot and dusty winds blow during dry season. However monsoon winds are strong and steady
(Koenisberger, 2001). Dominated hot and dry season remained a problematic situation in this
region throughout the centuries. Even Babur, the first Mughal ruler in India complained about
the dusty winds and climate of the region in his memoir ’Tuzik-i-Babri’ (Grover, 2002).

3. Microclimate Control
The gardens of paradise mentioned in the Holy Quran have been the source of inspiration
throughout the Islamic world (Kausar, 2005). Mughals also used this tool not only as a
symbol but to improve the quality of the immediate surrounding environment of their
buildings. The environment outside the building is important to control the inside temperature
of the building. The external air is treated by improving microclimate of the region which
consequently enhances the quality of air inside the building. Vegetation was added to improve
the quality of outer spaces and to enhance cooling by evapo-transpiration. The process of
evapo-transpiration adds water vapors to the air and brings down the air temperature. The
water bodies (still and moving) were added to the palaces to improve the humidity in hot and
dry regions (Figures 1 and 2). Fountains are the better way to improve the quality of air as it
sprinkles the water drops into the air and make the process of evaporation faster. Mughals
also used fountain in their buildings. These water channels and fountains are found frequently
inside the buildings. Nahar-i-Bahisht (canal of paradise) is an example of water channel
which passes through internal spaces of the building to modify internal environment. Most of
the Mughal buildings are surrounded by a landscaped area to modify the microclimate of the
region. For example, in Red Fort, Delhi the entire building is surrounded by garden.

Figure 1: A water body at Fatehpur Sikri.

Figure 2: Fountains improve the air quality in a hot dry climate.

4. Integrated IndoorOutdoor Living
The relationship between human activities and nature was strong in the past. With the
passage of time, this harmony was weakened resulting in buildings designed without context.
Not all the spaces in Mughal buildings were maintained naturally comfortable at all times.
With minor inconvenience, the users were suggested to shift from less comfortable spaces to
more comfortable spaces depending upon the seasonal changes. Whenever it was
uncomfortable inside the buildings, the people were suggested to use the outside spaces. For

18 Asif Ali

example, the verandah acted as buffer for inner spaces to protect people from prickly heat
while functioned as a place for organizing their daily activities during rainy season (Figure 3).
The hierarchical positions of courtyard, verandah and inner spaces in Mughal buildings
provide an organization of activities from one place to the other in relation to climate. For
example, the Panchmahal at Fatehpur Sikri was built for Akbar’s wives to enjoy their summer
evenings (Ashar, 2003). But this structure seems inadequate to be used unless curtains or
screens are put on the openings for further improvement of the internal environment and thus
grass mats with sprinkled water were used to cover the openings in order to cool down the hot
breezes (Figure 10). In Red Fort Delhi, the emperor’s throne at the centre of Diwan-e-Khas is
surrounded by two sets of openings four meters apart from each other (Figure 4). These
openings were covered with grass mats with sprinkled water during summers and heavy quilts
were suspended during winters. Another element to cover the openings was the roll up
bamboo screens which could be easily adjusted to control the sun’s penetration in the
buildings in different seasons and to protect the easterly and westerly low inclination sun. The
step wells were source of water on one hand while these were a shelter for extreme summer
noon on the other (Gupta, 1984). Even today, people in villages spend their daytime on lower
floors while they spend their nights on the terraces. The roof tops become the centre of
activities on sunny days in winters. The purpose of natural cooling in historical building was
to provide thermal comfort instead of lowering down the temperature of internal spaces by
natural means.

Figure 3: Verandah worked as a buffer between indoor and outdoor spaces while it was a
centre of activities during rainy season.

Figure 4: Emperor’s throne at Red Fort Delhi.

5. Thermal Mass
Historical buildings have thick walls which seem mostly due to spanning and structural
limitations of the materials but these walls are designed to provide a thermal insulation also.
Thick walls of low thermal conductivity materials have low transmittance value of heat and
larger time lag. The rate of heat flow within a wall depends upon the temperature difference
between the outer and inner surfaces. Large thermal capacity structure absorbs most of the
heat during the day and internal surfaces remain cool. To reduce the transmission of heat in
Mughal structures, the temperature of outer surfaces was further controlled by shading the
walls. When the outer temperature is lowered at night, the high emissive property of the walls
allows cooling down the wall surfaces rapidly. Flat roofs get more radiations while vaulted
and domed roofs prevent the absorption of heat of the summer’s vertical sun. Arched ceilings
have more space above the inhabitants for warm air to accumulate and finally it transmits the
heat to the cool internal surfaces of the roof. Vaulted and domical roofs due to its larger
surface area transmit the heat slowly to the interior spaces. Part of the domical roofs is always
shaded from the sun and it reradiates the heat outside on the same time due to temperature
differences.

6. Courtyard
Another feature of comfort adopted by the Mughals is the courtyard or sahan. In hot dry

20 Asif Ali

and hot humid climates, courtyard is the centre of the building socially and environmentally.
Courtyard provides a comfortable place for living. The courtyard makes a plan internally
oriented and prevents the internal spaces from solar radiations and hot-and-dusty winds. It
always shaded throughout the day even if the building is oriented to any direction. In the
evening, air temperature falls considerably due to re-radiation to the night sky. The heated
floor of the courtyard and the wall surfaces of the buildings raises the temperature of the air
present in the courtyard which rises up due to its light weight and finally a fresh and cool air
replaces the space evacuated by the hot air (Sharma et al., 2003). In Mughal buildings, the
courtyards are added with vegetation and water bodies most of the time which enhance the
humidity, cool the air by evaporation, keep dust down and provide shade for comfortable
living in hot dry seasons (Figure 5).

Figure 5: Courtyard at Jahangiri Mahal, Agra.

7. Shading Devices
The natural cooling may be achieved by cutting off the sun’s radiations, reducing the
absorption and slowing down the transmission of heat. The sunshades not only protect from
sun’s radiations through the windows but walls too. Buildings of the Mughal period have
deep and inclined sun shades which are more effective as they cover the more surface area

(Figure 6). Deep carving on building exteriors causes mutual shading in the day and in the
evening and the extended surface area increases convective heat transfer to the air. Part of the
domical roof is always shaded from the sun which re-radiates the heat outside.

Figure 6: Deep inclined sunshades protect more area of walls and openings from the sun’s
radiations.

Figure 7: Water channel inside the building at Red Fort, Delhi.

8. Evaporative Cooling
Evaporative cooling had not only been the element of external spaces in Mughal
buildings but the water channels and fountains were also part of the internal spaces, for
example in Red Fort Delhi and Agra (Figures 7 and 8). To enhance the process of

22 Asif Ali

evaporation, fountains were used which mixed the moisture to the air and increased the
humidity. At times, salsabil was used to maintain the water pressure to force the water to
come out of the fountain head (Figure 2). It consisted of inclined stone slab with wavy
patterns which further increase the humidity in the air.

Figure 8: Water channel outside the building at Jahangiri Mahal at Agra.

9. Natural Ventilation
Natural ventilation is the result of differential wind forces on various building surfaces
and temperature difference between outside and inside air. There are several factors which
affects the air flow within the buildings such as microclimate, size and proportion of
windows, orientation with respect to wind direction etc. A small window on a huge wall, as
we see in most of the Mughal buildings allows the wind to move inside the building with a
greater force. Tapered windows with smaller section inside also increase the velocity of
entering air. When the air with a greater velocity enters into a wider space, sudden expansion
results in lowering down of the temperature of inside spaces of the buildings. The hot air
rises up in a domed space and the vents near the ceiling (Figure 9) allow hot air to escape
(Soflaee & Shokouhian, 2005). One of the unique examples of natural ventilation in Mughal
buildings is Panchmahal at Fatehpur Sikri. The five storey pavilion is an asymmetrical
building diminishing from bottom to top and covered with a domed canopy. The building was
designed for wives of Akbar to enjoy their evenings during summer (Figure10). Many
compared it mistakenly with the windcather/tower or badgir, a common feature of Persian
architecture (Alfieri, 2000).

Figure 9: Vent near dome allows hot air to escape.

Figure 10: Panchmahal at Fatehpur Sikri.

10. Lattice Screen (Jaali)
Another strong feature of Mughal architecture which makes the internal spaces cool is
lattice screen or jaali. Jaali is used frequently in Mughal architecture and is a prominent
element. On one hand, it provides privacy and it controls the airflow and lower down the
temperature of internal spaces on the other. When there is sunshine outside in the day, the
internal spaces are not clearly visible from outside however, the diffused light is spread
throughout the interiors. To get a clear outside view, a cutout is provided at eye level for the
viewer sitting on the floor (Figure 11). Jaali in Mughal buildings mostly have a low sill or
sometimes without sill so that the air could move near the floor.

24 Asif Ali

Figure 11: Jaali ensures privacy and provides diffused light and view.

Figure 12: Indigenous trabeated system at Fatehpur Sikri.

11. Vernacularism
Muslims adopted the technology and architectural style of the region wherever they
reached. However, they applied the intelligent assimilation of their imported technologies
too. It makes a common vocabulary of style and technology throughout the Islamic world. In

India, this assimilation may be observed in its architectural style and also at the level of socio-
cultural elements. The architectural elements with their social and environmental significance
like verandah and courtyard were incorporated by Mughals in their palaces. This attempt of
Mughals made their buildings more harmonious with the nature. The technology for
construction of buildings like the use of local materials with the help of local artisans made
their buildings energy efficient as well. The style and technology developed by Muslims and
especially by Mughals in India had indigenous characteristics of the region with a fragrance
of foreign elements wisely induced. For example, the buildings at Fatehpur Sikri (Figure 12)
were constructed in red sand stone which was procured from quarries near the site only and
buildings were erected by indigenous trabeated technology with the help of local artisans
(Lowry, 1985).

12. Conclusion
This work has examined various passive cooling techniques and locally available
resources used in Mughal buildings in North India. The design elements of these buildings
have evaluated on the basis of their suitability to the climate.

The environmental innovations in Mughal buildings may be used for the concepts or
guidelines by the architects and planner for the design of buildings. These principles may be
developed and clubbed with advanced technology to promote harmony between man and
nature. As Fathy said, “The principles that produced the traditional solutions must be
respected. This is the only way modern architecture can surpass, in human and ecological
quality, the achievement of vernacular architecture in the hot arid regions of the world”
(Fathy, 1986).

The findings from this study suggest further research to explore guidelines for designing
energy efficient buildings for sustainable development in the present era and future world.

13. References
Alfieri, B. M. (2000). Islamic Architecture of the Inian Subcontinent. Laurence King
Publishing.

Ashar, c. B. (2003). Architecture of Mughal India. Cambridge University Press.

26 Asif Ali

Fathy, H. (1986). Natural Energy and Vernacular Architecture: Principles and examples with
reference to Hot Arid Climate. Chicago: The University of Chicago Press.

Grover, S. (2002). Islamic Architecture in India. New Delhi:CBS Publication.

Gupta, V. (1988). Energy, environment and buildings. Architecture+Design , 83-91.

Gupta, V. (1984). Indigenous Architecture and Natural Cooling. Energy and Habitat , 41-48.

Kausar, S. (2005). Meaning of Mughal Landscape. 10th International Seminar "Cultural
Landscapes in the 21st Century", (pp. 1-7). Newcastle-upon-Tyne.

Koenisberger, T. G. (2001). Manual of Tropical Housing and Building. Chennai: Orient
Longman Ltd.

Lowry, M. B. (1985). Fatehpur Sikri-Aresource book. Bombay: Marg Publications.

Sharma, D. A., Dhote, K. K., & Tiwari, R. (2003). Climate Responsive Energy Efficient
Passive Techniques in Buildings. IE(I)Journal-AR , 17-26.

Soflaee, F., & Shokouhian, M. (2005). Natural Cooling Systems in sustainable traditional
architecture of Iran. International Conference "Passive and Low Energy Cooling for
the Built Environment", (pp. 715-719). Santorini.

Sundarraja, D. M., Radhakrishnan, S., & Shanthi Priya, R. (2009). Understanding vernacular
architecture as a tool for sustainable development. 10th National Conference on
Technological Trends(NCTT09) (pp. 249-255). Trivandrum: College of Engineering
Trivandrum.

Asif Ali is an Assistant Professor of Architecture in the University Polytechnic of Aligarh Muslim University,
India. He received his B.Arch. from Aligarh Muslim University with Honors in 1998. He did his M. Arch.
from Aayojan School of Architecture, Jaipur, India. Asif Ali’s current interests include Sustainable
Development and Islamic Architecture in India.

Peer Review: This article has been internationally peer-reviewed and accepted for publication
according to the guidelines given at the journal’s website. Note: Original
version of this article was accepted and presented at the 2nd International
Conference-Workshop on Sustainable Architecture and Urban Design
(ICWSAUD) organized by School of Housing, Building & Planning, Universiti
Sains Malaysia, Penang, Malaysia from March 3rd -5th, 2012.


Passive Cooling and Vernacularism in Mughal Buildings in North India: A Source of Inspiration for Sustainable Development

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Passive Cooling and Vernacularism in Mughal Buildings in North India: A Source of Inspiration for Sustainable Development