The purpose of the work is the development of environmentally friendly technology of heat recovery from condensation of water vapor at a constant partial pressure of the outgoing flue gases in contact heat exchangers with a passive nozzle at thermal power plants running on natural gas, and the use of solar heaters in the block structure of an absorption refrigerating machine. Using contact heat exchangers can reduce greenhouse gas emissions. Greenhouse gas is harmful to the environment. Using solar heaters can improve the efficiency of the Li-Br absorption refrigerating machine. Ways to improve the efficiency of industrial enterprises are different. One of the main ways is to use renewable energy for heat recovery. In addition, the use of renewable energy sources reduces emissions of harmful greenhouse gases into the atmosphere.
Removing heat from an internal combustion engine is one of the most promising areas for the development of vehicles and heavy vehicles, especially. The article studies the influence of various parameters of the coolant and the parameters of the heat exchanger on the efficiency of heat transfer when removing heat from an internal combustion engine by an oil-liquid heat exchanger. The influence of “diffuser-confusor effect” on flow turbulization is considered. Literature analysis was carried out during the study. It raised such issues as: the issues of the efficiency of heat transfer from liquid to the wall under various conditions of the flow of the medium, the issues of changing the hydraulic regimes depending on the parameters of the medium, the issues of changing the parameters of the medium from the determining and secondary factors of heat transfer. The data on the influence of the temperature of various oils on their viscosity and density are presented. The influence of the state of the refrigerant on the efficiency of heat transfer is generalized. As a result of the analysis, a number of solutions have been proposed to the safe intensification of heat removal from the internal combustion engine. These solutions can be used for efficient oil cooling in diesel engines, mainly in engine design.
The article describes a method for improving the quality of produced liquid complex fertilizers by intensifying heat exchange using a pulsed flow of liquid in plate heat exchangers. The article is devoted to the question of the influence of impulse flow on the intensification of heat transfer in plate heat exchangers. Analysis of the literature shows that the increase in heat transfer is influenced by such factors as the shape of the channel, the location of the pulsation generator, as well as their amplitude and frequency. Changing the shape and pattern of the plates allows you to increase heat transfer, due to the receipt of greater flow turbulization. The results of the study of the heat transfer coefficient at various pulsation frequencies and coolant flow rates are also considered, from which the dependence of the heat transfer intensity on the pulsation frequency of the generator itself is visible.
The article addresses the problem of processing organic waste from the agro-industrial complex. To solve the problem of processing biomass, it is proposed to use gas-generating units that convert the resulting biomass into biogas. Particular attention is paid to the principles of operation of gas generators, the description of the stages of gasification, and the ongoing chemical processes. The scientific novelty lies in the proposal for the introduction of intelligent technology based on artificial neural networks to predict product quality and control the gasification process at each stage. As a result of the study, it was revealed that the use of information technology contributes to the optimization of the production process.
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