Temperatures are set to rocket throughout the 21st century, but design lessons from history could help Gulf states stay cool.
Temperatures in the Arabian Peninsula, Iraq and Iran could soar to uninhabitable levels during the course of this century, according to a new study.
Already, places such as Al-Ain and Kuwait can experience temperatures of up to 52 degrees Celsius. But the study predicts that the effects of global warming and the increase in greenhouse gases could push the average temperature up to nearly 60 degrees Celsius.
Currently, many residents of the Gulf can find refuge in air-conditioned homes, shopping centers and cars. But as temperatures increase, so does the need for cheaper, more sustainable, less energy-intensive ways of staying cool. Fortunately, the region’s past offers a rich source of architectural inspiration.
A history of heat
Historically, the inhabitants of the Gulf were either farmers living near oases in agricultural villages, Bedouins living in tents in the desert or urban dwellers living in cities. Given the global trend toward urbanization, it makes sense to take a closer look at how the latter group coped with the heat.
Traditional buildings in the Gulf’s cities and villages are designed to maximize shading, reduce thermal gain of the sun radiation, regulate building temperature and enhance air circulation. These effects are achieved through a clever combination of building materials, placement and design.
Natural materials such as limestone and mud—in some cases mixed with local desert plants—provide a construction material with the capacity to regulate building temperatures. The material itself is capable of absorbing moisture in humid conditions, which can later evaporate during hot and sunny days to provide a slight cooling effect. And the sandy texture and color of the buildings reduce both the absorption and emission of radiating heat.
Traditional buildings are placed adjacent to one another, with narrow roads and alleyways in between. This means the ratio of the area exposed to the sun relative to the building’s total volume is minimized, which in turn limits heat increases during the day time.
Many traditional structures feature an internal courtyard, often containing trees and a water well. The courtyard is typically surrounded by rooms or walls on all sides, maximizing the area in shadow throughout the day and creating a space for socializing in the evenings. When the sun bears down at midday, the courtyard works as a chimney for the hot air to rise and is replaced by cooler air from the surroundings rooms—this promotes air circulation and creates a cooling effect.
Glass is not a common material in traditional buildings. A typical room has two external windows—one very small window, located high up the wall, which is kept open to allow air to circulate and let in natural light. The second is larger, and closed by wooden shutters, with grooves to allow the flow of air inside the room while maintaining privacy. Rooms also have windows toward the internal courtyard for improved cooling. Finally, a mushrabiya—a projecting window with carved wooden latticework, typically located on the upper stories of a building—allowed for better air circulation and a view.
Some buildings also have a wind tower, which creates natural ventilation by circulating cool air. The narrow streets allowed them to be covered in most cases by light material from date palm trees to avoid direct sun light. This allowed for better air circulation between streets and courtyards of buildings, via the rooms.
All of these features helped to keep traditional buildings cool. But the question remains, how can we apply them in today’s cities?
Hot, modern buildings
Modern buildings in the Gulf are built predominantly from reflective glass, concrete and asphalt, which mean that temperatures really soar during daytime, due to high reflection or high absorption and emission of radiated heat.
But with research and improvements in building and pavement materials, designs, urban planning, insulation and the use of renewable energy, cities in the Gulf could maintain a comfortable lifestyle, with a lower level of carbon emission and fossil fuel use. For example, Masdar City in the United Arab Emirates has attempted to combine some of the lessons learned from the past with modern technologies by increasing shaded areas, creating narrow streets and constructing a wind tower.
The use of insulation would also reduce the need for air conditioning and lower electricity consumption. Meanwhile, natural or new materials that absorb moisture and increase thermal capacity (meaning the material can maintain lower temperatures in higher heats) could regulate heat gain and facilitate the natural cooling process.
I have developed a new patented technology to regulate building temperatures in extremely hot conditions using a heat sink in the ground. The heat sink will allow the ground to exchange heat with the envelope of the building, thereby reducing its thermal gain on hot days.
In recent years, the Gulf countries have sat up and paid attention to renewable energy and sustainability measures. Research and development is expected to progress further in this area if people are to live comfortably at the expected high levels of temperature, while reducing their dependency on fossil fuel consumption and carbon emissions.
*[This article was originally published by The Conversation.]
The views expressed in this article are the author’s own and do not necessarily reflect Fair Observer’s editorial policy.
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