Постановка задачи. Рассматривается задача охлаждения воздуха технических объектов с помощью водоиспарительных охладителей рекуперативного принципа действия. Результаты. Выводится уравнение нестационарного теплового баланса ограниченного объема с технологическим оборудованием с учетом его охлаждения рекуперативными водоиспарительными охладителями. Представлены математическая модель теплофизических процессов в косвенных водоиспарительных воздухоохладителях рекуперативного принципа действия и метод ее реализации. Модель содержит дифференциальные уравнения в частных производных, описывающие перенос энергии и массы в каналах теплообменного блока. Выводы. В результате проведенных исследований установлено, что установки водоиспарительного охлаждения косвенно-рекуперативного типа позволят, не повышая влагосодержания воздуха, значительно снизить температуру в помещениях с технологическим оборудованием, выделяющим большое количество тепла. Экологическая чистота и невысокая стоимость охладительных установок подобного типа добавляют положительный эффект от их применения. Statement of the problem. The problem of air cooling of technical objects by means of water-evaporative coolers of the recuperative principle of action is considered. Results. The equation of unsteady thermal balance of limited volume with technological equipment is derived taking into account its cooling by recuperative water-evaporative coolers. The mathematical model of thermal physical processes in indirect water-evaporative air coolers of the recuperative principle of action and the method of its implementation are presented. The model contains partial differential equations describing the transfer of energy and mass in the channels of the heat exchange unit. Conclusions. As a result of the conducted studies, it is established that installations of water-evaporative cooling of indirect-recuperative type will allow one without increasing moisture content of air to considerably to reduce the temperature in rooms with the processing equipment allocating a large amount of heat. Environmental friendliness and a low cost of cooling units of this type add a positive effect from their application.

In order to optimize the air environment temperature of the underground engineering equipment premises, it is necessary to conduct a comparative assessment of the operation of flow-through and counter-flow indirect-evaporative air coolers. Based on the previous mathematical models that describe the thermophysical processes in the channels of indirect evaporative coolers, an analysis of the structural and standard parameters of their operation is carried out. The most rational ratios of flows through the “wet” and “dry channels” are revealed and they ensure the maximum station cooling capacity. The transformer substation of the underground illustrates the effectiveness of their use. According to a result of the studies, it has been proved that the most rational ratio of air flows through wet and dry channels for flow-through indirect-evaporative coolers is 2.1-2.2, for counter-flow heat exchangers it is 3.0. The advantage of recuperation coolers is established by such indicators as: cooling capacity - 53.5%, air cooling range - 41%.

The problem of cooling sealed volumes, in particular electronic equipment, with the help of counter-flow evaporative coolers of an indirect principle of operation is discussed in this paper. The equation of the heat balance of a limited volume is given according to its cooling by a closed cooling air flow. The paper presents a mathematical model of heat and mass transfer processes in counter-flow water-evaporative coolers of the indirect principle of operation, which includes parabolic and elliptic differential equations with distributed parameters, and a method for the numerical implementation of this model is also proposed. The results of the study allow concluding that it is possible to significantly reduce the temperature in sealed volumes with the help of inexpensive eco-friendly water-evaporative coolers of the indirect principle of operation.