Investigation of air conditioning systems applied in office buildings and mechanical analysis of a sample office building

With the developing technology, many different mechanical installation systems can be applied to reach the desired comfort conditions in office buildings. System selection is based on criteria such as building usage purpose, climatic conditions of the area where the building is located, new / existing building status, mechanical system limitations (material strength classes, device capacities, etc.), architectural structure, operating cost, initial investment cost. In this study, five different mechanical installation systems are applied on a model office building examined which system is most efficient by comparing the advantages and disadvantages of the systems against each other, initial investment costs, operating costs and ease of operation. In the system modeling for the model office building, the device selection was made according to the systems to be applied for the model project based on the calculated results by calculating the heating / cooling loads with the Carrier HAP program. The operating and initial investment costs were calculated according to the devices selected for each system, and the thesis study was finalized by creating the analysis tables of the systems in line with the data obtained. According to the studies, the climate conditions of Istanbul for model office building, air-cooled system solutions constitute a more preferable situation in terms of total cost (operating cost + initial investment cost) and ease of operation. Water-cooled systems have an advantage at the point of investment cost but they do not provide a primary solution for this building due to the complex installation structure and high operating costs compared to air-cooled systems. Key Words: Variable flow, air handling, heat pump, fan coil