This project aims to study prepared by the working principle and design, centralized air-conditioning system cooled by water. And comparison with the difference between the temperature of the water - the cooler between 5 ° C and 8 ° C, will see that the difference in temperature of the water is increased. Considering that the same cooling load. To make the flow rate is reduced. Tend to use the pump and pipe size smaller. This study showed that the system has the effect of water temperature was 8 degrees Celsius, a performance cooling (COP) of 3.55, which is more than a system with different water temperature was five degrees Celsius with the performance of refrigeration (. COP) 3.41 The power consumption is determined by the air conditioning system is working eight hours a day for one year, keeping in mind that the effect of water temperature was 8 degrees Celsius, with the energy of 694,830.40 kW -. Hours per year Which is less than the difference between the water temperature was five degrees Celsius with power equal to 733,715.20 kilowatt - hours per year. The pipe size decreased as a result of reduced water flow. Prices of cold water pipes of the cooling systems with different water temperature was 8 degrees Celsius, which is equivalent to 181 125 baht less than the effect of water temperature was 5 degrees Celsius, which is equivalent to 226,875 baht.
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