An approach is proposed for selecting the most efficient updated (renovated) version of gas cooling system (GCS) based on concordance of energy and economic optimization results. This approach has been put into effect in optimizing the make-up and operation conditions of heat exchanging equipment in the course of its seasonal operation (efficiency criterion−energy cost) as well as in comparing GCS design versions with complete replacement of air cooling devices (ACD) and addition of new ACDs to the existing ones (efficiency criterion−life cycle cost). A general strategy is given for selecting the updated version of GCS of compressor stations (CS), and the characteristics of major Russian-and foreign-made ACDs are compared. An example of solution to problems of compressor stations of gas pipelines (diameter 1420 mm and operating pressure 7.45 MPa) lying under climatic conditions of the central zone of Russia is given.The technical state of the equipment of the gas transporting systems being operated since the 1970s, the change in the gas pipeline operation conditions associated with the depletion of reserves of the existing and development of new fields, and commissioning of new gas transporting systems attest to the fact that it is necessary to update and technically reequip compressor stations (CS) of trunk gas pipelines.Depletion of resources and marked aging and obsolescence of the principal technological equipment (gas pumping units) lead to increased operating costs (excessive consumption of fuel gas, increased frequency, time, and cost of repairs, and maintenance cost) and to reduced operational reliability of the gas pipeline system. In view of this, despite substantial capital investments, the need for complete replacement of gas pumping units (GPU) is indisputable.One of the problems to be solved at the stage of making major technical decisions is selecting unit power and manufacturers of the GPU. As criteria for making this decision, use can be made of net discounted revenue [1] or the discounted cost of the life cycle [2,3]. The second criterion can be taken as optimum for sound and reliable calculation of all components of operational and capital expenditures. In particular, in determining operational costs, attention must be paid to monthly CS operation schedule over a year with due regard for the correctives associated with planned variation in throughput of the gas pipeline [4].

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Improving the efficiency of fuel and energy resources in operating heat power plants is an important and relevant direction in the engineering development of various industries. A comprehensive solution to the problems arising as a result can be achieved, including the use of a step-by-step heat exchange process, which can be implemented in multisection heat exchangers for the utilization of the waste gases heat.

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Comprehensive approach to improving heat exchangers for heat recovery and utilization of heat power installations is achieved by applying a step-by-step heat exchange process to be implemented in multi-section heat exchange equipment. Determination of its optimal structural, design and layout parameters can be carried out taking into account various criteria, including the use of the thermal efficiency function. Expressions for the thermal efficiency function of the objects under study are obtained in the form of complex, non-uniform heat exchange systems, on the basis of which the method for evaluating their execution options is developed. Optimal sequences of heat exchange sections, heat load distribution and operating modes for this equipment are determined.