Development of an experimental facility for cooling circulated water of industrial plants

Abstract

The article discusses the installation and the hydrodynamic results analysis of three-phase fluidized bed experimental studies. An energy coefficient linear dependence of the circulating water evaporative cooler of the considered type on the irrigation coefficient has been experimentally established. The dependence of the fraction of circulating water evaporated moisture in an evaporative cooler of the type under consideration on the cooled water temperature at the inlet to the cooler and the irrigation coefficient has been established. The analysis of hydrodynamic and thermal processes occurring in a three-phase fluidized bed is carried out, and the main technological parameters for the optimal operation of installations with the specified bed are obtained in relation to solving the problem of cooling the circulating water. The dependence of the expansion of a three-phase fluidized bed on air velocity and irrigation density has been investigated. On the basis of the performed experimental studies, empirical formulas for calculations are derived.

Study on an air conditioning system with the use of natural cooling

“…The temperature of the cooled water was maintained at 23 °S using an electric heater. This condition was adopted according to the experiments carried out in the summer of 2018 [9]. Experiments have established that in order to ensure normal comfort indoors, the maximum temperature of the coolant should not exceed 23÷24 °S.…”

“…When calculating the air conditioning system, it is interesting to determine the final temperature of the refrigerant flowing down the inclined plane, depending on various factors. At the same time, the calculated data are: the cold demand of the house (Q0), the length (l) and width (a) of the roof, other factors (temperatures, wind speed, relative humidity, and so on) can be characterized by meteorological indicators [8][9][10].…”

“…In air conditioners with direct evaporation of water, the temperature of the air supplied to the room decreases, because of its adiabatic 1142 (2023) 012009 IOP Publishing doi:10.1088/1755-1315/1142/1/012009 2 humidification, that is, the heat content of the air is unchanged. The disadvantage of these air conditioners is the very high humidity of the air that enters the room [8,9]. Air conditioners with indirect air evaporation are free from such a disadvantage.…”

Cooling air in contact with natural sources of cold

“…The temperature of the cooled water was maintained at 23 ℃ using an electric heater. This condition was adopted according to the experiments carried out in the summer of 2018 [7]. Experiments have established that in order to ensure normal comfort indoors, the maximum temperature of the coolant should not exceed 23÷24℃.The temperature distribution of the flowing water along the length was measured with thermometers.…”

Mathematical model of heat and humidified air treatment in the injector camera

“…Instead of potentials, moisture content and partial pressure are usually used when calculating the moisture flow in air. Then equations ( 5) take the following form 𝑞𝑞 = 𝛼𝛼 𝑑𝑑 • (𝑑𝑑 𝑠𝑠𝑠𝑠𝑠𝑠 − 𝑑𝑑) and 𝑗𝑗 = 𝛼𝛼 𝑝𝑝 • (𝑝𝑝 𝑠𝑠𝑠𝑠𝑠𝑠 − 𝑝𝑝), (6) Dimensional quantities 𝛼𝛼 𝑡𝑡 , 𝛼𝛼 𝜃𝜃 , 𝛼𝛼 𝑑𝑑 , 𝛼𝛼 𝑝𝑝 are called heat transfer and mass transfer coefficients and take into account possible differences in real processes in their onedimensional formulation. These coefficients are connected by complex dependences with real processes occurring in a three-dimensional flow.…”