№79-20

Justification of non-traditional energy-conserving measures in power equipment of substations

H. Olishevskyi¹

¹Dnipro University of Technology, Dnipro, Ukraine

Coll.res.pap.nat.min.univ. 2024, 79:231–240

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ABSTRACT

Purpose. Analysis and justification of the use of a heat pump method of utilizing heat emissions in the cooling system of a powerful power transformer for various energy consumption schemes with subsequent recommendation of the most rational options.

The methods. When developing the calculation methodology, methods of analysis and mathematical modeling of thermodynamic processes occurring during the refrigeration cycle of a heat pump, as well as steam processes in a microturbine, were used.

Findings. An assessment of previously developed proposals for the transformation of electrical energy into thermal energy in various sources of electrical generation was carried out. The need for the introduction of non-traditional energy-saving technologies for the utilization of heat emissions of powerful power transformers was substantiated. According to the results of the research, it was determined that the most rational scheme for using a heat pump in the system for the utilization of heat emissions of a power transformer TDNM - 160 MVA/330 kV is a heating scheme, which has clear advantages in terms of energy saving (savings of conventional fuel by more than 4 times compared to a boiler) and requires significantly lower capital and operating costs compared to other schemes. The possibility of significant savings in conventional fuel (8%) when using a heat pump for preheating feed water for a microturbine is substantiated.

The originality. Mathematical dependences of the heat pump parameters were obtained to study unconventional methods of its application in the cooling system of powerful power transformers in order to utilize heat emissions for the needs of various power plants with the determination of rational modes of their operation.

Practical implementation. A comprehensive calculation methodology has been developed that takes into account specific parameters of the power transformer, steam power and heating plants, characteristics of the refrigerant, refrigeration cycle and other parameters of the heat pump and allows determining rational operating modes of power equipment and making recommendations on the possibility of using a heat pump in certain schemes of power plants.

Keywords: energy saving, conversion coefficient, steam microturbine, power transformer, heat pump, heat utilization.

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