The article considers the question of increase of efficiency of systems of energy enterprises of the mineral complex. Currently, the systems of energy enterprises of the mineral complex uses various types of power installations of low and medium power. The main types are gas turbine, gas, diesel, combined cycle, steam turbine and others. Their main purpose is to provide electricity and heat to industrial enterprises, technological processes and social structures. When choosing the type of installation uses a variety of criteria – technical, economic, reliability and other. Often it is necessary to take into account the climatic and geographical factors, for example, problems with fuel delivery . In recent times when selecting the type of plants used criterion of energy efficiency. The main indicator is the effective efficiency calculated by the classical method of heat balances. The article proposes the use of exergy method of determining energy efficiency, allowing to perform relative (exergetic efficiency) and absolute evaluation of the degree of thermodynamic perfection of the system. As an example, considered exergy analysis of steam turbine power as an alternative energy supply systems of enterprises.
The article is devoted to the search for the formal signs of the onset of crisis phenomena in the global economy related to the financial and oil and gas markets. To predict the crisis in the financial market and, as a consequence, the fuel market, the theory of «Jokers and Channels» is used in this paper. In accordance with the theory, the market is divided into predictable and unpredictable periods. Methods of the correlation analysis are used to analyze time series of exchange rates and oil and gas prices. In this paper, the authors construct the time dependence of the annual Pearson correlation coefficients between the ranks of quotes of the world leading currencies over the period from 1999 to 2013. A strong correlation between oil prices and the dollar exchange rate leads to the suggestion of identifying the crisis phenomena in the oil market, and due to the strong link between oil and gas prices, in the liquefied gas market. According to the results of the correlation analysis, the «Joker» period is determined and the conventional period of crisis enters it with some delay. Thus, based on the research the authors can conclude that, in fact, the global crisis starts earlier than the generally accepted term and is determined by the Joker period.