The indirect air-cooled heat exchanger is the core heat transfer component of the natural draft dry cooling tower

but it is easy to form deposits outside the tube bundles in actual operations

which impairs the heat transfer efficiency of the tube bundles and furtherreduces the cooling performance of the whole cooling tower. Therefore

it is of great significance to accurately grasp the thermal characteristics of natural draft dry cooling tower for operation optimization. In this paper

the calculation methods of the heat transfer coefficient and the resistance coefficient that characterizes the thermal performance of indirect air-cooled heat exchanger tube bundles are reviewed. The attenuation factor of thermal characteristics and the increase factor of resistance characteristics are defined. The theoretical calculation method for online identification of thermal and resistance characteristics of the natural draft dry cooling tower is established based on theoretical analysis

with real-time operation data as big data source. The calculation results show that the relative trends of heat transfer and resistance characteristics of the heat exchanger in the natural draft dry cooling tower can be accurately reflected in time by the two factors

which provides a theoretical basis for the enhanced energy saving by heat transfer and anti-freezing of the natural draft dry cooling tower under the complex environmental conditions.