Demo site 2. Istanbul, Turkey

/Demo site 2. Istanbul, Turkey
Demo site 2. Istanbul, Turkey 2017-11-07T12:19:43+00:00

Name: “ScOLa” Building (School of Foreign Languages)
Location: Özyeğin University.Istanbul, Turkey
Status: In operation and monitoring since September 2014
Surface: 17.756 m2

Building use: Faculty building
Building typology: Single-building
Climatic zone: Mediterranean

The ScOLa (School of Languages) Building is a part of a master plan of the Özyeğin University, which is situated in Nisantepe in Istanbul (north-west Turkey). The building is located at the center of the campus, just besides the Student Center. More than 1.450 students, 125 tutors and 10 managers are using ScOLa since September 2014. As the user capacity of the building is very high, there are three entrances to the building. The building consists of 66 classrooms for 20 people, 4 lecture rooms for 56 people, 2 lecture rooms for 90 people, 3 seminar rooms, 25 study rooms, 54 offices, cafeterias, toilets, hallways and various service rooms. All classes are to be used between 08:00 to 17:00 five days a week, accept summer months and all instructor offices are to be used between 08:00 to 18:00 according to schedule of instructors. Since 2015, the basement hosts the students clubs which extends the use of this building to nights and weekends.

The whole campus is designed and constructed aiming to become an example of sustainability and energy efficiency. The University aims to provide hands-on education to its students by providing them facilities that teach by example; energy efficiency is monitored and studied by students very closely; thus, they learn about real performance of an energy efficient building in first person.

All campus buildings are candidates for internationally known LEED (Leadership in Energy & Environmental Design) certification, but this new faculty building aims to go a step further in energy efficient issues. In fact, it behaves 50% more efficiently than the rest of buildings in the campus.

The Turkish Demosite takes part in the “Zero Istanbul 2050″ initiative. This initiative is coordinated by Özyegin University and will increase the visibility of the demosite and facilitate the spread of NEED4B results.

> Demo site team: OZU, BDESIGN and FIBA

Özyeğin University, namely the Center for Energy, Environment and Economy (CEEE), undertakes the research activities and coordinates the demo site activities. B-DESIGN is the architect company in charge of the design of the ScOLa building. FIBA Group deals with project and construction management in Özyeğin University.

In addition, more than 20 stakeholders have participated in the design, construction and operation of this building. From the beginning, the preliminary expectations of the stakeholders are cost affordability, easy maintenance, availability of the selected products in the market and smooth construction facilities.

> Building process and schedule:

During the design phase in 2012 the building design was developed considering the expectations of the stakeholders. 1 M€ saving was achieved on optimization of solar shading. Also, 35 % energy saving was achieved thanks to lightning simulation and optimization, which is entirely fed with PV installation.

The construction works took place mainly along 2013 and the building final commissioning took place in May 2014. The building real time monitoring started in summer 2014 when students started a new academic year.

> Main technologies and solutions

  • Insulation: Average U value is 1,6 W/ m2 K for the total envelope area. Walls are 0,302 W/ m2 K, roof is 0,248 W/ m2 K and ground floor is 0,568 W/ m2
  • Windows: Double glazed, low-e type glazing with U-value of 1,3 W/ m2 This decreases the need of mechanical cooling significantly.
  • Façades: Various solar shading devices have been installed, designed according to the façade they are mounted at. The sun breakers’ design has been done running many simulations. There has been an agreement among all stakeholders since the same style of the sun breakers used throughout the campus was wanted at the beginning. Mock-ups have been installed at the differentfacades of the building, and approved by a team of stakeholders prior to implementation of all façade elements
  • Heating: Low temperature heating water (LTHW) is generated by Natural gas fired boilers which are installed in Campus Central Plant. High efficiency type of boilers with oxygen trimming and carbonmonoxide control system. Heating system is supported by the solar water heaters on the roof.
  • Cooling: Chilled water is produced by high COP (6,17) and NPLV (Non-Standard Part Load Value 7,25) Centrifugal Chillers in Campus Central Plant. Free-cooling HEX is combined with Cooling Tower and automatic controls in order to generate free cooling energy whenever the outside temperature below 15 C.
  • Ventilation system: Earth tubes are being used for partial cooling /heating of the facility ventilation air. Supply air is provided by natural ventilation in ScOLa Building. In order to provide acceptable indoor air quality (ASHRAE) mechanical exhaust system supports the system. The horizontal air-ground heat exchanger system is installed on the eastern side of the building. The system installation area covers approximately 1.200 m² of land and installed at depth of 2 m, with 72 m long horizontal pipes and 10m width. The heat exchanger is so far the largest installed system in Turkey.
  • Lighting system: The lighting system is totally automated which enables almost 35% energy saving for lighting system. Different sizes of LED armatures and T5 armatures have been designed according to the application area. The most common armature type is Square LED Armature with 40W power. The energy density of the lighting system for each floor changes between 3,3 – 5,8 W/m2 . The installed capacity is 79 kW and yearly lighting power is 152.208 kWh. The consumption density of the lighting system is 9,4 kWh/m2 without automation and 6,1 kWh/m2 with DALI automation. The overall lighting system consumption can be covered by the 126kWp PV system on the rooftop of the building which means all lighting system is substantiated by sun. Additionally, utmost importance has been given to maximum usage of daylight.
  • Renewable Energy Sources: PV Installation. The entire roof of ScOLa Building is covered by photovoltaic cells corresponding to 126 kWp. Poly c-Si Yingli Solar YL250P-26 PV modules with 250Wp capacity have been used within the project.  There are 504 pieces of PV module with 15,4% efficiency under standard test conditions (1000W/m2 horizontal radiation, 25oC module surface temperature).  Produced DC electricity is converted by 6 pieces of 20kWh string inverters of Advanced Energy formerly RefuSOL.  Combining all these inverters, there are 24 strings with a serial connection of 21 modules for each.  Each inverter has integrated DC circuit breaker, DC fuses for each string and surge arrestors for high voltage protection.  All six inverters have been combined into a distribution panel and connected to the grid through automated relay on floor electricity panel.  Almost 160.000 kWh energy production, total lighting consumption of the Scola and 68.8 tonnes/a carbon saving.
  • Monitoring and Operating system: Sensors, meters and transmitters are installed to measure different end-uses (lighting, heating, ventilation, PVs, etc.). Advanced building automation system will allows full control of HVAC and lighting systems. LCD screen for displaying instant data of the building performance. Building Energy Dashboards are displayed, enabling, engaging and energizing building occupants to save energy. This dashboard makes real time energy flow visible, accessible and engaging so that building occupants get the data visualization tools to manage and reduce their energy consumption. It provides real-time feedback to teach, inspire behavioral change and save energy resources in ScOLa and other buildings.
  • CEEE Application Room. This 20-people classroom is located in the third floor, Level + 133 and is dedicated for present and future simulations and analysis during the monitoring phase of the building. Occupancy patterns of the classroom are recorded and other sensors record temperature, humidity, CO2 ppm level and air velocity differences depending on occupancy.
  • Other energy saving measures

i) Rain water will be collected from the main quad of the campus, filtred, treated and distributed to building in order to use of wc flushing and irrigation purposes.

ii) The building will be equipped with advanced automation systems, which are sensitive to occupant density and control. All motors and pumps shall have VFDs and EFF1 class motors.

In the concept of long term measurement of ScOLa Building energy performance related parameters, detailed real time energy consumption, indoor air quality, HVAC operational details, earth tubes operational parameters and solar plant energy performance are monitored.

The ScOLa building has a “Multi-dimensional Energy Performance Monitoring, Visualization and Optimization Platform”. This platform has been developed by three graduate students with the assistance of the designers, CEEE and automation provider. This has resulted in a start-up company, which is emerging in the automation sector in Turkey nowadays.

All installed energy analyzers and indoor air quality sensors together with process monitoring Hardware, such as calorimeters, are monitored via a central energy management platform called “OzuGreen Energy Dashboard”. The platform intends to guide the building operator for the optimum operation of building systems as a decision support mechanism.

In addition, information is displayed in the “OzUGreen Public Kiosks and LCDs “, which are used by students, visitors and tenants. These dashboards show real time energy flows, enabling, engaging and energizing building occupants to save energy.

Building performance and savings

Energy consumption values are expressed in terms of primary energy. Different conversion factors have been applied according to national or European standards:

Primary energy consumption

Breakdown of Energy Consumption in the building by type of measure (kWh/m2 year):

Heating Cooling Lighting Ventilation Domestic
Hot Water
22,63 16,81 8,1 2,48 50,02 
Renewable Energy Sources Contribution (kWh/m2 year)