## 1 Introduction  
Some areas are rich in coal resources but lacking in water resources. Air-cooling systems are widely used to help conserve water, especially in areas where water is scarce. Water quantity determines the type of cooling towers used in a power plant. An air conditioning system was modeled in TRNSYS software [1] for energy and water conservation; the results showed the benefits of optimizing the control strategy and cooling tower configuration with a maximum energy savings and water reduction of 10.8% and 4.8%, respectively [2]. To protect water resources, significant conservation is obtained by applying an indirect air-cooling tower as shown in References [3; 4]. The indirect air-cooling tower is relatively complex, and the consumption of the circulating pump is relatively high; however, it can achieve low back pressure due to the hybrid condenser. The cooling unit could save approximately 50-80% of water compared to a wet-cooling tower. The indirect dry-cooling tower removes heat due to the natural buoyancy generated by heated air near the radiator; therefore, the thermal performance of the radiator is substantially affected by environmental factors, especially crosswind and temperature. [PERSON] et al. [5] investigated the thermal performance of a wet-cooling tower with different filling layout patterns under windless and 0.4 m/s crosswind conditions, respectively,and discovered that the optimal nonuniform layout pattern has better thermal performance under 0.4 m/s crosswind conditions. Previous research [6] has found that the cooling efficiency of the tower is reduced, and electricity produced by the power station decreases to a large extent due to a higher environmental temperature or crosswinds exceeding 4 m/s in the summer or windy season, respectively, thereby improving cooling efficiency through an air-cooling system [7]. [PERSON] [8] found that cooling capacity first increases and then decreases as the crosswind speed rises according to numerical simulation and experimental results. [PERSON] et al. [9] indicated that heat transfer efficiency can decline due to inhomogeneous intake air around the tower inlet, the influence of which is greater than the air flow rate. Previous studies have suggested that a wind deflector can reduce the impact of crosswind on heat transfer and enhance the heat transfer rate in cooling tower radiators. [PERSON] and [PERSON] [10] proposed the concept of windbreak to improve the cooling tower structure in 1993. The cooling performance of cooling towers has also been shown to improve using windbreak methods in and around towers on windy days [11]. The air flow rate of the tower and cooling efficiency can increase by 5-10% and 2-5%, respectively, after wind deflectors are used [12]. [PERSON] [13] established a new stack configuration for a dry-cooling tower and found that the cooling performance could be increased by 9% at a wind speed of 10 m/s according to numerical simulation. [PERSON] et al. [14] indicated using numerical methods that a wind deflector can only improve cooling performance in a particular direction. Different climates, geographical conditions, and unit capacities garner different research results, including the effects of crosswind on heat transfer and the number of wind deflectors used in improvement measures. While extensive studies have explored air-cooled heat exchangers [4; 15; 16; 17; 18; 19; 20; 21] and air-cooling towers [7; 22; 23; 24; 25; 26], few have looked at air-cooling towers with rotating wind deflectors. To investigate the effects of rotating wind deflectors on the air flow and heat transfer performance in air-cooling towers, an experimental system based on a surface condenser aluminum exchanger (SCAL)-type indirect air-cooling tower has been established with a 1:100 proportional reduction according to the similarity principle, and 3-D numerical models of the prototype indirect air-cooling tower have been built.