Thermophysical parameters of steam gas flow in refrigerating chambers with controlled atmosphere. Numerical analysis
DOI: 10.21047/1606-4313-2017-16-3-47-52
UDC 621.565.7
Petrov E. T., Opalikhin A.F.
Keywords: refrigerating chamber, controlled atmosphere, project, air distribution, fruit storage, mathematical model, numerical analysis
UDC 621.565.7
Thermophysical parameters of steam gas flow in refrigerating chambers with controlled atmosphere. Numerical analysis
For citation: Petrov E.T., Opalikhin A.F. Thermophysical parameters of steam gas flow in refrigerating chambers with controlled atmosphere. Numerical analysis. Vestnik Mezhdunarodnoi akademii kholoda. 2017. No 3. p. 47-52
Abstract
The article deals with the results of the work on the development of a mathematical model for refrigeration and process equipment in refrigerated chambers with controlled atmosphere taking into account the variable aerodynamic characteristics of the network during operation. Numerical investigation was carried out using the example of a chamber with the capacity of 200 tons, with dimensions of 15×8×7 m for storing apples under the influence of two main influencing parameters (mass flow and changing the angle of installation of the deflector). The main parameters determining the efficiency of the cooling system are chosen. Numerical analysis of the mathematical model was carried out, the degree the main parameters’ influence on the uniformity of temperature and humidity fields in the cramped chamber of the refrigerator was revealed, the main methods of optimal control during operation, ensuring compliance with the requirements of technological regulations, were selected. The intensity of circulation of steam-gas flows at each moment of time is determined from the condition that the characteristics of the fans and the gas dynamic characteristics are consistent, where the intensity of the frost formation on the surface of the air cooler and the corresponding change in the mass flow rate are the determining ones. An analysis of the data obtained by the numerical study shows that these two parameters have a significant effect on the unevenness of the temperature-humidity fields and can be used in the formation of a general adaptive control algorithm.
Abstract
The article deals with the results of the work on the development of a mathematical model for refrigeration and process equipment in refrigerated chambers with controlled atmosphere taking into account the variable aerodynamic characteristics of the network during operation. Numerical investigation was carried out using the example of a chamber with the capacity of 200 tons, with dimensions of 15×8×7 m for storing apples under the influence of two main influencing parameters (mass flow and changing the angle of installation of the deflector). The main parameters determining the efficiency of the cooling system are chosen. Numerical analysis of the mathematical model was carried out, the degree the main parameters’ influence on the uniformity of temperature and humidity fields in the cramped chamber of the refrigerator was revealed, the main methods of optimal control during operation, ensuring compliance with the requirements of technological regulations, were selected. The intensity of circulation of steam-gas flows at each moment of time is determined from the condition that the characteristics of the fans and the gas dynamic characteristics are consistent, where the intensity of the frost formation on the surface of the air cooler and the corresponding change in the mass flow rate are the determining ones. An analysis of the data obtained by the numerical study shows that these two parameters have a significant effect on the unevenness of the temperature-humidity fields and can be used in the formation of a general adaptive control algorithm.
Keywords: refrigerating chamber, controlled atmosphere, project, air distribution, fruit storage, mathematical model, numerical analysis