Development of Energy Enterprises in the Context of Green
Transformation

Plotkin, Juriy; Левченко, Наталія Михайлівна; Shyshkanova, Gannа; Levchenko, Serhii

doi:10.21272/jes.2023.10(1).g3

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…While heat-using thermotransformers are becoming widespread, a more detailed study of the operating process and improvements to their working cycle are needed [4]. The research works [5,6] considered the possibility of using CO 2 in heat pump systems.…”

Section: Introductionmentioning

confidence: 99%

An Increase in the Energy Efficiency of R744 Heat-Using Thermotransformers

Arsenyev,

Piteľ,

Korol

et al. 2023

Energies

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This article deals with improving waste heat transformation in heat-using thermotransformers. Based on the directives of the European Commission on refrigeration equipment requirements, the possibility of using carbon dioxide (R744) in heat-using thermotransformers was evaluated. The possibility of the effective use of heat-using thermotransformers operating within the Chistyakov–Plotnikov cycle in the heat pump mode was assessed. As a result, a comparative analysis was performed with existing modern plants for combined cycles with an expander, for the expansion of CO2 in saturated steam, a suction gas heat exchanger (SGHE), and a compressor–expander unit. The design schemes with a throttling device and an SGHE were selected for a comparative analysis. As a result, calculation models for evaluating the operating parameters for the initial and proposed design schemes were developed. These models allow for evaluating thermodynamic and mode parameters for heat-reducing thermotransformers. They also allow for ensuring energy efficiency indicators and conversion factors for each cycle. Overall, the dependencies for the cycle conversion ratio for the pressure increase stage in the compressor were obtained for various under-recovery rates. Moreover, the cycle conversion ratios for the proposed design schemes were obtained depending on the discharge pressure of the first compressor. The proposed design schemes allow for increasing the energy efficiency of heat-using thermotransformers by an average of 23%, depending on the suction pressure in the compressor.

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Section: Introductionmentioning

confidence: 99%

An Increase in the Energy Efficiency of R744 Heat-Using Thermotransformers

Arsenyev,

Piteľ,

Korol

et al. 2023

Energies

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“…Achieving this aim will make it possible to implement measures to achieve several UN Sustainable Development Goals [17], e.g., clean water and proper sanitation; affordable and clean energy; and industry, innovation, and infrastructure.…”

Section: Introductionmentioning

confidence: 99%

Development of a High-Rotational Submersible Pump for Water Supply

Kondus,

Pavlenko,

Kulikov

et al. 2023

Water

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Submersible pumps are the leading electricity consumers in centralized water supply systems. Considering the cost structure of the life cycle of pumping equipment, the main costs should include investment costs, electricity costs during operation, and costs of repairing pumping equipment. Considering the growing cost of electricity in the world, the cost of manufacturing pumping equipment is significantly increasing, which in turn causes an increase in its price. The key factor in increasing the competitiveness of such equipment on the market is its modernization with the achievement of a higher level of energy efficiency with a simultaneous reduction in cost due to a reduction in weight and dimension parameters. In the research, a significant increase in the head from 15 m to 65 m of the submersible pump stage was achieved by increasing the rotation frequency from 3000 rpm to 6000 rpm and designing the pump for this rotation frequency. As a result, the pump head, created by the flowing part with the basic stage (eight pieces), can be provided by the pump using only two designed stages. It creates the prerequisites for reducing the mass of the pump from 200 kg to 45 kg, or by 77.5%. Also, in designing the pump, energy efficiency was increased from 74.6% (for the existing pump) to 79.4% (by 5% for the developed pump). The research results made it possible to significantly contribute to reducing the cost of the life cycle of the submersible pump installation.

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