Passive Cooling: Responding to Electricity Demand in the UAE

Wissam Yassine and Karim Elgendy

During the 1990s and the early 2000s, the UAE, and the city of Dubai in particular, witnessed a rapid rate of growth in its built environment driven by a real estate bubble. In the span of a few years the city’s unprecedented rate of growth, which was driven by both demand and speculation, completely transformed the city. But such growth came at a price.  Driven by their need for quick returns, developers cared little beyond delivering a building on time and on schedule. Speed of construction often came at the expense of quality, and issues of performance and energy use played almost no role in the design and construction processes. Common disregard of performance was also fueled by the fact that most buildings were commissioned for developers – rather than owner/occupier clients – since their focus lied solely on reducing initial capital expenditures without considering operating costs that are typically borne by tenants.

Figure 1. Photo of the Masdar Institute Courtyard showing the wind tower, and the layered facades of residential units. Copyrights: Nigel Young/ Foster+Partners

These commercial forces, coupled with relatively cheap electricity across the UAE, and a lack of demanding building regulations have paved the way to the development of unsustainable design practices over the last decade. A typical office building in the UAE today is a predominantly glazed high rise tower. Basic design decisions such as orientation, massing, and envelope design are usually made without much regard to their impacts on the buildings’ energy performance, and passive cooling strategies are rarely considered.

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A Damascus School Revives Traditional Cooling Techniques

Karim Elgendy

In late 2008 the French President Francois Sarkozy inaugurated a new French school in Damascus, Syria. The French school, known as Lycée Charles de Gaulle,  follows the french educational system and is accreddited by the French ministry of education. The school was designed by the French architects Ateliers Lion together with the German environmental engineering firm, Transsolar.

Image 1. Night view of school central courtyard showing the solar chimneys. Copyrights: Adria Goula Sarda, Ateliers Lion

The brief for the design team was to  to develop a campus for the school with a capacity for 900 students ranging from kindergarten to high school. The design team was also tasked to develop a campus that embodies sustainability by using low-technology solutions for ventilation and conditioning of the school spaces, while maintaining the thermal comfort levels required for students in an educational environment.

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The First Low Energy House in Jordan

Aqaba House, Copyrights Joseph Zakarian, Jo Magazine

UPDATED – Jordan’s first low energy house in Aqaba is a residential project designed with the intention of creating a prototypical low-cost energy efficient building that achieves substantial energy use reductions without incurring additional construction costs.

After launching a design competition for a prototypical energy efficient house the house owner – a Jordanian environmental researcher- in collaboration with the Jordanian Center for the Study of the Built Environment, chose to proceed with a practical low energy design with an architecture that resonates with local aesthetics.

The competition’s winning scheme by the Dutch architect Florentine Visser, was based on a 3-floor design that included the many spaces required by the owner’s brief (including 6 bedrooms, 3 bathrooms, a car garage, and a basement) in a house with a total area of approximately 420 sqm.

In her approach to designing an energy efficient house, the  house’s architect used a combination of passive low energy design strategies and efficient active systems. Passive strategies are strategies that use design to reduce the need for heating and cooling. In the context of the Middle East passive design mostly refers to passive cooling strategies since the cooling requirements of middle eastern buildings far exceed their heating requirements.

Active systems, on the other hand, are mechanical systems such as heating, ventilation, and Air conditioning units (HVAC) efficient active systems use less energy to heat, ventilate, or cool buildings.

Most successful low energy buildings use a combination of passive strategies, active systems, and renewable energy generation to reduce their energy use ,with some buildings achieving the ultimate target of net zero energy, which essentially means that a building -or a  development- generates all the energy that it consumes.

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