The guarantee of ensuring the safety of people and material assets in the event of a fire requires a careful approach to the design and installation of smoke ventilation. In order to evacuate people from the smoke zone in a timely manner, technical devices with a normalized limit of resistance to fire are installed – smoke valves. To determine the distribution of the pressure of the air flow in the smoke control valve over its cross-sectional area, the method of mathematical modeling is used. With the help of a mathematical model, visual modeling of the distribution of the gas-air mixture flow is carried out, a detailed analysis of hazardous factors is carried out, an assessment of the possible temperature and time of flame propagation, determination of the probable degree of smoke in the interior space and the ways of smoke movement.

Keywords: smoke, fire, ventilation system, smoke protection, smoke valve, mathematical model

The use of biogas complexes has found wide application, first of all, as a solution to environmental problems associated with the disposal of waste from the agro-industrial complex, as well as obtaining additional types of energy and organic fertilizers. Many designs of biogas plants have been developed that are suitable for operation in various climatic conditions. The choice of a biogas plant design is the most important stage of the planning process. The article discusses the improvement of the bioreactor installation in order to obtain a larger volume of final raw materials, increasing its quality and efficiency of the installation as a whole. The conditions that contribute to improving the efficiency of biogas plants are determined. The technical characteristics of the biogas plant are presented. The pros and cons of bio-installations, their impact on the environment are considered. The prospects for the development of this energy sector in Russia are assessed.

Keywords: biomass, biogas plant, gas production process, waste disposal, harmful emissions

The article discusses several types of wood frame house construction technology, primarily "Canadian technology". The rate of increase in construction in Russia is estimated. The structural materials of external enclosing structures used in frame housing construction are compared with the most commonly used components for construction. A comparative assessment of heat losses in percentage ratio during the operation of wooden frame houses and traditional ones is given. The pros and cons of frame housing construction are considered. A detailed analysis of the costs of construction and operation of wooden frame houses was made.

Keywords: frame house construction; Canadian technology; building materials; dynamics of price changes