Abstract. In the existing shaft air heater installations (AHI), that heat the air for air suppliers in cold seasons, a heater channel is used. Some parts of the air from the heater go to the channel, other parts are sucked through a pithead by the general shaft pressure drawdown formed by the main ventilation installation (MVI). When this happens, a mix of two air flows leads to a shaft heat regime violation that can break pressurization of intertubular sealers. The problem of energy saving while airing underground mining enterprises is also very important. The proposed solution of both tasks due to the application of an air curtain is described in the article. In cold seasons the air treatment process should be used and it is offered to place an air curtain in the air suppliers shaft above the place of interface of the calorifer channel to a trunk in order to avoid an infiltration (suction) of air through the pithead. It's recommended to use an air curtain in a ventilation shaft because it reduces external air leaks thereby improving energy efficiency of the MVI work. During the mathematical modeling of ventilation and air preparation process (in SolidWorks Flowsimulation software package) it was found out that the use of the air curtain in the air supply shaft can increase the efficiency of the AHI, and reduce the electricity consumption for ventilation in the ventilation shaft.

Analysis of promising directions for the development of technical means for providing a microclimate at livestock farms shows that the most promising are aerial adsorption and catalytic apparatuses. To assess the effectiveness of the application of the developed technological solutions, the modeling of the operation of the recuperative ventilation system of the barn with air-flow adsorption devices was carried out. The results obtained show that the required microclimate in the barn is provided. The required number of heat transfer units for the air fountain heater and heat exchanger, as well as the rational value of the specific capacity of the gasholder, have been determined.

Nowadays improving the methods of anaerobic processing of organic waste is an important topic in the development of biogas technologies. Different articles suggest different options to increase the efficiency of biogas plants. The use of catalytic heaters in biogas plants makes it possible to increase the efficiency of their operation. To study the features of using catalytic heaters, a scheme for the functioning of a biogas plant with catalytic heating was developed. The experimental studies with the use of the designed biogas plant with catalytic heating was carried out. Experimental studies of the designed biogas plant with catalytic heating showed the applicability of the proposed technical solutions for the catalytic heating system.

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