This study experimentally investigates the performance of an indirect evaporative cooling fresh air-handling unit at different modes of operation under harsh climatic conditions experienced in Qatar. Temperature and relative humidity are measured at various points within the fresh air handling unit for each mode of operation and, the measured data are stored and analyzed. Cooling performance indices are evaluated in terms of temperature difference across the heat exchanger, dry and wet bulb temperature effectiveness, thermal...

An experimental investigation of the performance of a direct-indirect evaporative cooling fresh air handling unit with different modes of operation is presented. Linear regression analysis is used to fit the experimental results, and the correlation coefficient is evaluated. It is found that the highest temperature reduction of 18.8°C is achieved across the heat exchanger for the tested unit when the water shower mode is implemented at an ambient dry-bulb temperature of 44°C in conditions of...