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This paper presents a performance analysis of air-cooled chillers with evaporatively cooled condenser in 3 different cities of Turkey with the help of meteorological data provided from the Turkish State Meteorological Service (TSMS). The aim of the study is to determine the effects of evaporative cooling on inlet air of the condenser unit under various humidity and temperature conditions, and therefore on cooling performance (COP) of the air conditioning system. Considering the summer season between June and September for 4 months, it is assumed that the cooling requirements are provided by the direct expansion air-conditioners and the condenser inlet air is cooled by evaporative cooler with 70% effectiveness. The results show that after the evaporative cooling the highest COP increase of the chillers is occurred in most arid city as 40.5%, while the lowest increase was in the most humid city as 15.5%. This improvement increased the cooling capacity by 14.3% and 5.56%, correspondingly. In addition, the mean electrical consumption is considerably decreased as 9.97%, 15.49% and 6.97% for 3 different cities. The highest water consumption was around 5 tons per day for 10 hours of operation and 1400 m3/min mean air flow rate. [ABSTRACT FROM AUTHOR]

This work is a theoretical study that is related to the efficient use of heat pipes designed for cooling of computers. Refrigeration fluid absorbs heat from the heat source (Central Processing Unit - from CPU). The vaporizing fluid in the evaporator moves towards the condenser and condenses the cycle is completed. In this study, the designed cooling system with heat pipes mainly consists of a copper block located at CPU surface, six pieces circular channels inside block, and the heat pipes working are independent from each other. NH3, R-22 and R-134a were chosen as refrigeration fluids. Five different film temperatures were used for each fluid. It was determined that the most efficient cooling of CPU can be obtained with R-22. [ABSTRACT FROM AUTHOR]