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The organization of a closed cycle of water use is one of the priorities for both recycling water supply systems and wastewater treatment systems of industrial enterprises. Water cooling systems are considered and the possibility of closed water cycle organization is estimated. For cooling systems of circulating water supply of industrial enterprises, depending on the water content, the cooling scheme can be: running, open (evaporative cooling) and close. The technological scheme of water treatment based on the co...

A characteristic feature of fuel cells is a weak dependence of their energy efficiency on the scale of the installation and the ability to provide the required level of power by simply increasing the number of fuel cells. The use of fuel cells, including in combination with renewable energy sources, can mean a technological revolution in the transport sector and energy, will reduce the negative impact on the environment to a minimum level. In this paper, a review of the current state of problems and trends in the ...