As winter comes to an end, a critical topic that directly affects summer comfort often goes unnoticed in many projects: solar control on the facade.
February and March are ideal months to evaluate the performance of the building envelope before the intense solar load of summer begins. Excessive overheating, increased energy consumption and reduced indoor comfort during the summer months are often the result of passive measures that were not considered during the design phase.
Today, the sustainable architecture approach is no longer limited to obtaining an energy performance certificate. How a building envelope responds to the sun has become one of the fundamental performance indicators of design.
The Solar Reality and Heat Load in Türkiye
Due to its geographical location, Türkiye experiences high levels of solar exposure for a significant portion of the year. According to data from the Turkish State Meteorological Service, the country’s annual average sunshine duration exceeds approximately 2,700 hours. Particularly during the summer months, substantial heat gains occur on south and west facades.
Under the Regulation on Energy Performance in Buildings published by the Ministry of Environment, Urbanization and Climate Change of the Republic of Türkiye, building envelopes are required to balance heat gains and losses.
However, thermal control cannot be achieved through insulation alone. In contemporary buildings with high glazing ratios, direct solar radiation can cause significant indoor temperature increases. At this point, passive solar control becomes essential.
What Is Passive Solar Control?
Passive solar control refers to the management and redirection of solar radiation through architectural elements, without increasing the load on mechanical cooling systems.
The objectives are:
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Reducing excessive heat gain during summer
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Benefiting from daylight in winter
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Controlling glare
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Lowering cooling demand
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Balancing overall energy consumption
This approach is directly aligned with sustainable design principles. Research indicates that properly positioned shading elements on facades can significantly reduce cooling loads.
The Strategic Role of Shading Systems
Shading systems are facade integrated elements that block, redirect, or filter solar radiation before it reaches the interior.
Horizontal systems are generally preferred on south facades. During summer months, the sun travels at a higher angle, and horizontal elements are effective in cutting off this radiation.
Vertical systems perform more efficiently on east and west facades. They are used to control low-angle sunlight during morning and evening hours.
The critical point is to consider shading devices not as decorative accessories, but as performance components of the building envelope. Shading elements designed without proper orientation and solar analysis do not deliver the expected level of performance.
Energy Efficiency and Operational Costs
When solar control is not properly addressed within the building envelope, cooling systems operate for longer periods during the summer months. This not only increases energy consumption but also contributes to higher carbon emissions.
The energy efficiency policies of the Ministry of Energy and Natural Resources emphasize the importance of prioritizing passive solutions in buildings. The most efficient energy, after all, is the energy that is not consumed.
facade-based passive solar control:
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Reduces cooling loads
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Balances long-term operational costs
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Positively impacts the building’s energy performance certification
For this reason, shading systems are not only architectural decisions; they are also economic ones.
Why Material Selection Is Critical
It should not be overlooked that shading elements are continuously exposed to outdoor conditions. UV radiation, rain, humidity, temperature fluctuations and air pollution directly affect the durability of facade components.
At this point, material selection must meet two fundamental criteria:
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Exterior durability
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Architectural compatibility
Technowood systems combine the natural appearance of wood with an aluminum substructure, addressing both of these requirements simultaneously.
By bringing the warmth of natural wood to the facade and integrating it with an aluminum support system, these solutions provide resistance to exterior environmental conditions. As a result:
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UV resistance is ensured
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The risk of moisture-related deformation is reduced
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Maintenance requirements are minimized
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Long-term durability is achieved
The key consideration is to integrate the system into the project in coordination with facade orientation and solar analysis during the design phase.
Architectural Identity and the Balance of Light and Shadow
Shading systems do more than provide performance; they introduce rhythm and depth to the facade.
The controlled filtering of daylight:
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Creates balanced interior illumination
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Reduces screen reflections
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Enhances visual comfort within the space
At the same time, the shadow patterns formed on the facade give the building a dynamic character. For this reason, shading elements function not only as technical solutions, but also as design tools.
Preparing for summer does not only mean landscape adjustments or interior decoration. The way the building envelope responds to the sun directly determines summer comfort.
Passive solar control strategies establish a balanced relationship between energy efficiency, user comfort and architectural aesthetics.
With properly positioned shading systems, sunlight can be redirected in a controlled manner rather than being completely blocked. In this way, indoor comfort is preserved while the architectural identity of the facade is strengthened.
References
Ministry of Environment, Urbanization and Climate Change of the Republic of Türkiye – Regulation on Energy Performance in Buildings
TS 825 – Thermal Insulation Requirements for Buildings Standard
Ministry of Energy and Natural Resources of the Republic of Türkiye – Energy Efficiency Strategy Documents
Turkish State Meteorological Service – Sunshine Duration Data for Türkiye
Chamber of Architects of Türkiye – Climate-Responsive Architecture Publications
