Contractor

Name : Government of Turkey

Construction Manager

Name : Tugba Salman Gurcan, Ekho Architecture and Consultancy

Stakeholders

Function : Others

Cakmanus Engineering
Building Services

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Function : Construction company

San-is Construction

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Function : Construction Manager

United Nations Development Program Turkey

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Function : Certification company

Passive House Institute Darmstadt

Owner approach of sustainability

This pilot project sets an example for energy-efficient renovation in the region. It provided lots of information to the Government that helped in the development of the ''Energy Efficiency in Public Buildings’’ projects going on. 

The building was opened with a ceremony, with the participation of former Minister of Development (Turkey) Cevdet Yilmaz, the Director of the United Nations Development Programme Helen Clark, and the Fatma Sahin, the mayor of Gaziantep City. 

 

Architectural description

Constructed in the 1970s, this hollow brick masonry building had no insulation in the outer shell (exterior wall: U= 2,70 W/m2K, roof: 1,60 W/m2K, windows: 2,50 W/m2K). It has only one level with a floor area about 250m2 separated into 3 wings, and is being used as an office space. The south side of the building is surrounded by dense pine trees with an average height of 8m, which are an asset for design in regards to solar shading. Also the building has a compact form therefore it is a great advantage towards achieving the EnerPHit standard. However the building was in such a bad condition; due to moisture there were heavy molds and irreversible disorders like saltpeter on the interior walls. Consequently, insulation in combination with good ventilation and air tightness brought the building sustainability, which avoids all the nuisances.

Energy consumption

• Primary energy need : 79,00 kWhpe/m².year

Calculation method : Other

Breakdown for energy consumption :

Primary energy consumption is calculated according to PHPP
Annual heating demand 20 kWh /(m2a)
Heating load 19 W/m2

Envelope performance

• Envelope U-Value : 0,10 W.m^-2.K^-1
More information :

- Super-insulated building fabric (walls and roof: 200 mm rockwool – 0,033 w/mK, ground floor and foundation wall: 200mm XPS, 0,035 w/mK).
A building envelope with minimized thermal bridges and air leakage.

- Airtightness Test Result: Before Renovation 9 ach50 - After Renovation 1 ach50

- Triple Glazed, Low -E insulated frame windows with U value: 0.81 W/(m 2K) were installed

Systems

Heating system :
• Heat pump
• Low temperature floor heating
Hot water system :
• Solar Thermal
Cooling system :
• Floor cooling
Ventilation system :
• Double flow heat exchanger
Renewable systems :
• Heat pump

- Besides energy efficiency the building with thermal insulation, airtightness and ventilation guaranteed new and healthy air, without any risk of disease related to non-controlled ambient moisture. Also, insulation in combination with good ventilation and airtightness brought the building sustainability, which avoids all the nuisances such as moisture that generates molds and irreversible disorders like saltpeter, which was observed on the existing interior walls before the renovation.

- The ventilation system was designed with steel ductwork and highly energy-efficient MVHR unit (heat recovery efficiency: 75%)

-Heating and cooling was performed by using a radiant floor heating/cooling system activated by an air sourced heat pump.
- Solar panel system was placed on the roof to meet hot water demand.

Construction and exploitation costs

• Total cost of the building : 174 000 €