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Electricity consumption for cooling in data centers is increasing rapidly. The heat released from equipment's in datacenters is discharged into the room and room has to be kept at acceptable temperatures. Free cooling technology is more efficient way instead of using conventional systems in cold regions to reduce the electricity consumption for cooling. It is useful to know the free cooling potential of a location before installing the free cooling system. In this study, free cooling potential of six cities (Ankara, Antalya, İzmir, Erzurum, Konya and Trabzon) located in different regions of Turkey is investigated according to supply air temperatures from 15 ˚C to 21 ˚C. Then Power Usage Effectiveness (PUE) value of a datacenter with a free cooling chiller is calculated for each city by using the electricity consumption measurements of cabinets and free cooling system conducted in a datacenter in Ankara, Turkey. Calculations show that free cooling system is convenient for Erzurum, Ankara and Konya with PUE values 1.23, 1.37 and 1.37 and the potential calculated to be almost 100% for eight, six and six months respectively for different supply air temperatures 17 ˚C to 21 ˚C. In addition to cold climates, free cooling system for Antalya in Tsat=19 ˚C is calculated to save 46% energy on annual basis.

Energy efficiency in buildings sector can provide influential solutions to the threats arising from the increase in carbon emissions. Since efficient design of the buildings and equipping them with renewable systems increases the final cost, strategies should be developed to encourage building owners. The first stage of these strategies is certification of these buildings. However, modeling of the buildings equipped with renewable systems is possible with the use of more than one software and requires detailed technical expertise. An easy-to-use software, where all calculations are conducted in a single software, will be useful in the spread of certification processes. For this reason, in this study, an easy-to-use software has been developed that can be used during the certification of zero energy buildings which eliminates the requirement of more than one software. The software makes use of the climate, electricity consumption, building, and renewable system properties data to predict the energy demand and production, and generate zero energy consumption building certificate.The heating demand, photovoltaic (PV) and wind system estimate of the software are verified by using real data and R 2 values are calculated as 0.92, 0.97, and 0.98 respectively. A certificated passive and zero energy consumption building is modeled in the developed software as a case study building and NZEB certificate was awarded to the building by the software. Therefore, in this study, an easy-to-use software is developed and verified to certificate the on-grid zero energy buildings that eliminates requirement of detailed technical knowledge and usage of more than one software.

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