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In order to ensure uninterrupted gas supply to the population, there is a need for its underground storage under high pressures. The value of this pressure depends on the type of soil and its mechanical strength. The volume of storage depends on the number of people living in the area and for what purposes the gas is used. Because it is used for heating, local heat supply and domestic purposes, it is crucial to determine which sources of heat are used by individual and central sources of heat. Therefore, such heat sources have been considered, whose thermal loads have been determined according to the particular region’s heat specific expenses and for the provision of local heat supply. Gas consumption was also determined by electric energy indicators of heat sources, heat losses during the transformation and transportation of the heat pipe. Accordingly, it is introduced a method to determine the storage volumes of gas storage facilities of settlements with different quantities of populations, the amount of electric power consumed by compressors and by electric drives for air cooling, the required surfaces.

The issues of energy saving in buildings are considered by using recuperators to save heat and cold, lost when removing air from the buildings space and transferring some of the energy to the fresh air that is supplied into the premises. Such heat exchangers can be a part of the mechanical ventilation system, as well as stand alone and carry out partial (due to heat exchange) or complete heating of fresh air (by using a heat transfer agent or an electric heater). Depending on the place of application and the recuperator type, they can have different energy efficiency or thermal efficiency, price, and respectively, energy economic indicators and payback period. Often, the developers and plants, the manufacturers go on partial deterioration of these indicators to reduce the product price, suggesting to use simpler structures, in particular, recuperators of “air-air” type with a different number of pipes in the heat exchanger. In the present material, the methods of calculation of multi-pipe recuperators for utilization of heat of exhausted air, having the simplest structures, are given. The areas of expedient use in various climatic conditions of the Republic of Armenia are determined. The criteria are the given expenses, fuel economy, their manufacture costs.