Mirjalol Toshtemirov<sup>1

1</sup>Samarkand State Architecture and Construction University named after Mirzo Ulugbek (Uzbekistan)

Abstract

This scientific paper presents the results of experimental studies on the process of simultaneous air cooling and humidification, as well as a description of the experimental setup developed by the authors for conducting various performance tests. The setup features a combined design and includes a spray chamber and a miniature cooling tower, similar in design to those used in modern air conditioning and ventilation systems. This combination of components enables a comprehensive study of heat and mass transfer processes occurring during the interaction between water, air, and structurally developed surfaces. In the cooling tower, circulating water is cooled using a spray nozzle, which creates a fine water mist, and a layer of natural stone, which acts as a heat and mass transfer element. Water entering through the nozzle forms a misty cloud and settles on the surface of the stones, becoming evenly distributed throughout their structure. When in contact with the natural stone surface and the surrounding air, the heat contained in the water is actively separated, transferred to the air, and transported into the free volume within the cooling tower. The heated air is then exhausted to the outside by a fan, ensuring stable heat removal and maintaining the required water cooling regime. Depending on operating conditions, the air passing through the system can be partially or completely recycled. A recirculation duct is used for this purpose, allowing for flexible adjustment of the balance between fresh and recirculated air, which is particularly important when researching energy-efficient air conditioning methods. Water cooled in the cooling tower flows into a special collector tray located at the bottom of the unit. From there, it is fed to the upper edge of the hygroscopic element located in the cooling and humidification chambers. As it moves along the length of the hygroscopic material, the water is evenly distributed over its surface, creating a thin film. As air passes through this element, intense heat and moisture exchange occurs: the air lowers its temperature, becomes saturated with moisture, and acquires the parameters necessary for further research or practical application. The developed setup opens up extensive possibilities for analyzing evaporative cooling processes, evaluating the effectiveness of various design solutions, studying the properties of natural stone as a packing material, and optimizing the operation of air conditioning systems. The results presented in the article can be used in the development of energy-efficient air conditioning systems for residential and industrial buildings.