This paper reported a review, calculations and measurements based on study of working water flow parameters influence on the Indirect Evaporative Air Cooling (IEAC) thermal performance. It was considered from a multiple aspects of previous researches of concept, system configuration, operational mode and industrialization, as well as the future focuses and commercialization. Calculation model has been obtained from the governing equations of heat and mass transfer in primary and secondary air and water flows. Parameters of water affecting on evaporative cooling performance such as mass flow rates and flow configuration have been obtained. Model was validated against theoretical data from the literature and good agreement between the prediction and measurement was achieved. The calculated results show that closed cycle working water flow characteristics affect supplied air parameters less than 4 %. It affects cooling efficiency, which mostly depends on mass flow rates ratios of primary and secondary air flows and spacing between plates of wet and dry passages.