A mathematical model of the dynamics of evaporative cooling air in the device with plane-parallel nozzles
DOI:
https://doi.org/10.31548/energiya2019.03.083Abstract
Abstract. Numerous studies are devoted to the calculations and analysis of hydrodynamic and heat exchange characteristics of equipment for air humidification, as a rule, to determining the parameters of various types of installations for stationary modes of operation. The researchers evaluated the influence of various disturbing factors on the surface parameters in film flows and the heat exchange processes of the air-humidity flow, built mathematical models of evaporative cooling of water in irrigation plants with plane-parallel nozzles, but they describe the stationary process of heat and mass transfer. The simulation of the dynamics of the air cooler with a plane-parallel nozzle was performed only for temperature regimes: the change in temperature of water and air, and the humidity characteristics of the process are not considered.
The specificity of the research object provides an analytical research method that allows using only a generalized scheme of the process without specifying the design features of the installation. The mathematical description is based on the analysis of heat and material balances and the laws of heat transfer of Newton, Dalton mass transfer.
The computational-technological scheme of the air cooler is a set of rectangular plates placed parallel to each other, water is evenly supplied on the upper end edge of the plates, which under the action of gravity moves along the surface, covering it with a water film that evaporates into the air flow between the plates. The flow of water and air can be direct-flow, countercurrent or cross-flow.
An improved mathematical description of the dynamics of heat and mass transfer processes in installations of heat and humidity air treatment in the microclimate maintenance systems of industrial premises can be used to optimize the operation mode and create an automatic control system.
Key words: air humidification, evaporative air cooling, plane-parallel nozzle
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