Heat transfer and mass transfer process of water cooling tower packing surface

Water cooling tower is the use of water and air between the heat and mass exchange, so that the water temperature is reduced to meet the requirements of a facility. It is widely used in thermal power plants, chemical companies, food engineering, people living in the use of air conditioning and other areas of construction. With the progress of the national economy, energy and water resources will be more precious, the scope of application of water cooling tower to further expand. Although the application of water cooling tower ** than the expansion, but its mass transfer process is very inadequate. In order to accurately describe the heat transfer process of the appearance of the filler in the water cooling tower, the following two aspects are required:

A. Accurately describe the thermal conductivity of the filler surface of the theoretical plate, and mass transfer coefficient of the calculation method;

B. Can give the correct result after the cooling tower default calculation method. So far to practice things situation, these two are very short owe. The various default calculations currently used are based on the thermal equilibrium equation between water and wet air, the enthalpy difference method. Although there are a variety of improvements, but only a little change in the calculation method, there is no theoretical development of theoretical research. Because there is no theoretical reason for the filler in the water and air between the heat and mass exchange mechanism, because the default calculation used in the empirical value, that is, mass transfer coefficient by the structure of the filler size, water vapor flow and other factors, suitable for use Poor sex. Based on the analysis of the existing theoretical plate type, the theory of joint film evaporation is given, and a theoretical plate type describing the process of thermal and mass transfer in fill is given. The results of this plate are compared with the experimental results, indicating that it can describe the heat transfer process between water and wet air in the filler.

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