Abstract
Economical energy, reduction of cost and utilization of clean energy are required to meet the human needs. Evaporative cooling units are considered as a solution for these requirements by transforming such systems into technologies that meet these needs. The equipment’s cost, installation and operating costs are simple and low compared with refrigeration systems. An effective design is obtained by employing three stages settlement that equipped with a cross flow heat exchanger, direct and indirect evaporative coolers. In order to assess the design performance, a program code is developed. Flow and design parameters namely, air flow rate, piping length and diameter are studied. In addition to that the inlet air-dry bulb temperature at several different time duration over day is studied. The study was conducted in Tikrit University, Iraq (34. 35N; 43.37 E). Readings are recorded in June, July and end of August for two days (24 hours a day). The results show that, saturation of direct evaporative cooler effectiveness varies in the range, 67% - 96% and overall effectiveness of the unit varies in the range, 80% - 120%. It is provided that the system is efficient in dry and hot areas, and an improvement in the performance of the current design is achieved successfully.
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