Abstract
Various methods of natural cooling are used to solve the problem of global warming and increase the energy efficiency of refrigeration systems. One of such methods is radiation cooling to outer space. In this paper we consider the possibility of using radiation cooling to lower the temperature of the liquid entering the processing once a day at 5:00. For cooling is proposed a system that is a cylindrical tank with a cooling casing. The coolant in the casing is cooled by the action of the radiators at night. The system is operated in the climatic conditions of the moderately cold climate of the Ust-Kamenogorsk city (Kazakhstan), located at 49°58’N. To assess the efficiency of the system, its mathematical modeling was carried out based on the solution of the heat balance equations. As a result of the simulation, data were obtained on the temperature and heat fluxes in the system during the year. It is found that the cooled liquid reaches the required temperature (<+ 5 °C) three hours after loading into the system for 123 days a year. The average daily specific cooling capacity of radiators reaches from 50 to 150 W/m2 in winter and in the summer this value does not exceed 30 W/m2.