SCHEMATIC SOLUTION OF A LOW-TEMPERATURE INSTALLA-TION WITH CARBON DIOXIDE RECIRCULATION TO REDUCE THE ENVIRONMENTAL BURDEN ON THE ENVIRONMENT
ZHFZWY
DOI:
https://doi.org/10.25712/ASTU.2072-8921.2023.02.022Keywords:
refrigeration machine; heat recovery; carbon dioxide; heat transfer.Abstract
Refrigerating machines are used in many areas of industry to produce artificial cold. Refrigerating agents that carry out heat transfer are necessary for the operation of refrigeration units. As with any substance, refrigerating agents have their own service life, after which this substance must be disposed of. Unfortunately, most modern refrigerating agents are substances based on fluorocarbon compounds; there is an environmental hazard in the disposal of these substances. To reduce the level of environmental pollution by means of fluorine emission into the atmosphere, a number of technical solutions are currently being considered, one of which is the use of natural substances as refrigerating agents, one of which is carbon dioxide (R744). This article proposes a design solution for an installation running on carbon dioxide as a refrigerating agent, a feature of this installation is the principle of its operation. Refrigeration treatment in the chamber takes place in direct contact with carbon dioxide. A technique is proposed that allows calculating and selecting nodes of a CO2-powered refrigeration unit. A 3D model of the refrigeration unit has been developed according to the size of the equipment currently produced by the industry with the layout of the nodes allowing this installation to be mobile. The principle of recuperation implemented in the installation reduces the consumption of refrigerating agent, and the method of direct contact of carbon dioxide with the product significantly increases the freezing rate. The use of R744 as a refrigerant will reduce the concentration of emissions of ozone-depleting refrigerants, which in turn will have a beneficial effect on the current environmental situation.
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