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Interventions in the Turkish Demo Site

The Turkish university hospital building set for interventions will include a ventilated wall façade of mineral insulation material for an overall surface of 785m2, an aluminium sunblind on the southern façade, film coatings on the eastern and western façades, solar collectors and an adsorption chiller.

The existing energy system provides heated and chilled water to convective terminals and ventilation units. It consists of three gas boilers working in parallel, whereas cooling loads are covered through three electrically driven chiller units. Heating and cooling energy generation systems are independent of each other, whereas they share the distribution system. This means that heating and cooling loads cannot be achieved at the same time. The new system will work alongside the existing one, operating as many hours as possible. The existing system will eventually become the BRICKER system’s back-up.

Turkish demo building model geometry used for simulation

As part of this new system, an adsorption chiller unit with a nominal cooling capacity of at least 75 tons will be installed. The chiller will use silica gel or zeolite desiccant in a dual adsorption chamber configuration and water refrigerant. Each chamber will alternate modes of regeneration and adsorption.

Aydin is blessed with abundant sun, even in winter months, and to put this energy in good use, 20 PTMx-36 sun-tracking parabolic solar collector modules, developed by SOLTIGUA that can concentrate the solar radiation on a tube, thus heating the fluid flowing through the tube to 250-300°C, will be installed. All modules will be installed on ground over separate foundations for each straight bolt plate. The hot fluid will be used for trigeneration – producing hot water, providing chilled water for air-conditioning via absorption cooling technology, and generating electricity using an Organic Rankine Cycle (with natural gas topping) unit developed by RANK. This means the building will consume less electricity from the grid and will burn less natural gas as a result of meeting the energy demand partially from the energy supplied by the sun.

The existing energy system provides heated and chilled water to convective terminals and ventilation units.

High level system integration of the Turkish demo building.
Please click the graphic to enlarge the image

Despite the heavy heating load in winter and cooling load in summer, currently the building does not involve any heat-recovery systems. To eliminate waste while meeting fresh air requirements, we will install heat exchangers where the incoming fresh cold air will be preheated by the outgoing stale heated air without mixing, thus reducing the amount of natural gas consumed in the burners. The heat exchangers will do the opposite in summer, thus reducing the energy used for air-conditioning. In addition, we will incorporate variable speed drives on fans and compressors to reduce the electricity consumption.

As the hospital’s insulation is inadequate, all exterior walls will benefit from lightweight silicium insulation with a thickness of 25 mm and 5 mm silicium sealant. Epsilon value of the material to be applied will be 0.363, Lambda value will be 0.04 and Rho values will be 190.  Silicone based exterior paint will be applied to the insulation as a final layer. There will also be 2mm thick aluminium sills painted with electrostatic powder paint glued on the existing marble window sills, in order to prevent water penetration to the facade.

Scheme for ventilated façade

Above the existing roof, BTM PP3000 single layer waterproofing membrane, 10 mm silicium paste, 90 mm lightweight silicium insulation and 10 mm silicium paste will be applied. The Epsilon, Lambda and Rho values will be equal to the ones at the facades.

To reduce the air-conditioning load in summer, reflective solar film coatings will be applied over the eastern windows of A Block East facade and over the eastern and western windows of A Block West façade. The U value for double windows will be max. 3.0 W/m2K.

The project’s interventions will also include fitting a 785 m² façade with ventilation system, purposely designed and manufactured for the BRICKER concept. The natural vented cavity located between the wall and façade will create a “chimney effect” to help the building cool in summer. The ventilated façade will consist of an innovative polymer concrete with low density (1700-1850 kg/m³) made of recycled materials like crushed glass and recycled PET resin. Apart from the mechanical properties given by the manufacturer of the material, in parallel, ACCIONA confirmed through two different tests carried out at its labs the bending tensile strength of the cladding panel and also the tensile strength of the embedded anchors. Finally, in order to size and optimise the auxiliary aluminium structure of the ventilated façade, a complete structural calculation through dedicated software tools has been done to the different elements that form the system: horizontal and vertical auxiliary profiles, brackets, and anchors and fixing elements. To do that, the calculations were carried out based on the requirements prescribed in the European regulations, and taking into consideration all the loads: dead load, wind load, and seismic load.