Energy Efficiency Indicators Research Articles

ОЦЕНКА ЭКОЛОГИЧЕСКОЙ БЕЗОПАСНОСТИ И ЭНЕРГЕТИЧЕСКОЙ ЭФФЕКТИВНОСТИ ТРАНСПОРТНЫХ СРЕДСТВ, ОБСЛУЖИВАЮЩИХ МАРШРУТЫ ГОРОДСКОГО НАЗЕМНОГО ТРАНСПОРТНОГО КОМПЛЕКСА

The urban passenger transport complex is the most important part of the infrastructure of modern cities and provides a number of key functions. The condition for the effective operation of the transport complex is the balanced development of the subsystems included in its structure, which in turn necessitates the formation of a methodological framework that determines the conditions for such development. Based on the indicated provisions, the purpose of the study is formulated, which is to increase the efficiency of the operation of vehicles serving the routes of the urban ground passenger transport complex, based on the results of an assessment of their environmental safety and energy efficiency. To achieve this goal, it is necessary to solve a number of tasks: – study and analysis of the content of research papers, regulatory and technical documents in the field of environmental safety assessment of energy efficiency of vehicles; – development of a methodology for assessing and comparative analysis of environmental safety and energy efficiency, vehicles serving urban public transport routes; – assessment of environmental safety of various categories of vehicles serving the routes of the urban ground passenger transport complex; – generalization and analysis of the results obtained, formulation of conclusions and practical recommendations. During the study, an approach was used that assumes: modeling of energy consumption parameters of vehicles implementing various technologies of fuel and energy supply and a comparative assessment of indicators determining their energy efficiency and environmental safety in traffic conditions on urban passenger routes. Based on the implemented approach, the methods of system and statistical analysis of the initial information, mathematical modeling and methods of multi-criteria evaluation of the results are used in the work. The main result of the study is the numerical values of the indicators of energy efficiency and environmental safety of vehicles implementing various technologies of fuel and energy supply in the conditions of urban ground passenger transport complex, which is the scientific novelty of the study. The use of the obtained values in assessing the efficiency of passenger transportation by vehicles of various categories allows for the formation of a fleet of vehicles based on the results of a multi-criteria analysis. One of the directions of further research involving the use of the results obtained is the development of a comprehensive methodology for determining the optimal structure and coordinated formation of subsystems that make up the urban ground passenger transport complex.

Determining the energy efficiency indicators of the diesel train DPKr-2 and the rail bus 620M based on traction calculations using the numerical method of solving the equation of train movement

The purpose of the article is to compare the technical and energy parameters of the diesel train DPKr-2 and the railbus 620M based on traction calculations using mathematical modeling when solving the train movement equation. The mathematical model of the train is adapted to determine the movement parameters of the specified rolling stock units according to different variable phase coordinates for different movement modes. To achieve this purpose, the authors used methods of system analysis, nonlinear programming, and numerical methods for solving differential equations. The accuracy of the calculations was verified using simulation modeling methods and compared with experimental data. To analyze the results, the obtained indicators of traction calculations – technical speed and specific consumption of diesel fuel – were compared. As a result of the comparison, the specific fuel consumption per ton-kilometer meter, a significant saving of energy resources is observed. Comparative specific fuel consumption per passenger-kilometer meter, on the contrary, indicates an increase in the consumption of energy resources. The mathematical model of the train is adapted to determine the movement parameters of diesel trains and rail buses according to different variable phase coordinates for different drive modes. The practical significance lies in determining the efficiency indicators of the use of different types of rolling stock on the railways of Ukraine, taking into account economic, social and migration factors.

To evaluation of the efficiency of UzTE16M3 diesel locomotives on the high-speed section of the railway

The results of the calculation of the kinematic parameters of the movement of a freight train by a graphical method on a virtual hilly section of a high-speed railway when moving without stops and with stops at an intermediate and final station are presented. The values of energy efficiency indicators of UzTE16M3 diesel locomotives were obtained in quantitative and monetary terms when driving a freight train of a unified mass of train. The research results are presented in the form of tabular data and will be implemented by specialists of the locomotive complex in substantiating the efficiency of the transportation work of UzTE16M3 diesel locomotives in real operating conditions.

To the effectiveness of using of UzTE16M3 diesel locomotives on a hilly section of railroad

A program algorithm and a method for producing (performing) traction calculations are proposed, based on geometric constructions of changes in the speed and time of train movement along the track, relying on the specific resultant forces of the train in the travel track of rolling stock. Calculations of the kinematic parameters of the movement of a freight train on a virtual hilly section of the railway were carried out using a graphic-analytical method when moving with stops and without stops at the intermediate and final stations. The values of the energy efficiency indicators of UzTE16M3 diesel locomotives when driving a freight train with a minimum train weight in quantitative and monetary terms are substantiated. The numerical results of the research are obtained in the form of tabular data, which specialists of the locomotive complex can use when analyzing and assessing the efficiency of the transportation work of UzTE16M3 diesel locomotives under real operating conditions.

ENERGY EFFICIENCY OF USING THE ACCUMULATED IN THE SOIL OF SOLAR ENERGY IN THE HEAT PUMP HEATING SYSTEM

A heat pump scheme is proposed to ensure heat supply to the building, which during the heating period of the year uses the energy received in the summer by solar collectors located on this building and stored in the soil battery. A thermodynamic analysis of the efficiency of the heat pump heating system in combination with a vertical soil heat exchanger during the accumulation of solar radiation in the soil in the summer period and with the subsequent extraction of this heat from the soil in the heating period was carried out. The main operating parameters of the heat pump heating system (optimal speed of the heat carrier, minimum specific consumption of external energy, effective coefficient of transformation of the heat pump from the month of the heating period) were determined using balance equations at different values of the depth of the well and the diameter of the pipe. Graphical dependences of energy efficiency indicators on the determining parameters of the system were constructed and analyzed. The obtained ratios between the parameters can be used in calculating the optimal operating conditions of the vertical soil heat exchanger in heat pump systems of low-temperature heating in order to achieve its maximum energy efficiency.

Applying Energy Efficiency Indicators in the Industrial Sector - Case Study in the Furniture Industry Focused on Electricity Consumption

Applying Energy Efficiency Indicators in the Industrial Sector - Case Study in the Furniture Industry Focused on Electricity Consumption

The Impact of Heating Systems on Society and Nature New Opportunities Based on Blockchain Technology

The paper assesses the importance of the models used to determine the efficiency and the environmental impact of the heating products like heating pumps (HP). An appropriate model of evaluation may help identifying the presence of greenhouse gases and reducing their influence. The paper's novelty resides in the way the hidden sides linked to greenhouse gases' presence, are identified, and eliminated. The research methodology considers an environmental model linked both to the Global Emission Model for Integrated Systems on energy efficiency indicators and to the break-even analysis for greenhouse gases. The model gives hints on reducing the high costs to upgrade the living conditions in residential buildings. The results illustrate the environmental and societal impact and the social potential and highlight the technical implications for such operating systems. They incite optimizing the Heat Hybrid Pumps' design within decentralized energy systems to strengthen energy networks' flexibility and the environmental convenience. The research straightens out the understanding of heat pumps mechanisms, delineates the efficiency of their increasing use through the block-chain technology outlining its future potential for people and society's health and benefit.

О ПРИМЕНЕНИИ КРИТЕРИЕВ TEWI, LCCP И LCC ДЛЯ СРАВНЕНИЯ ЭНЕРГОПРЕОБРАЗУЮЩИХ ХОЛОДИЛЬНЫХ СИСТЕМ

The paper considers environmental metrics that assess the man-made impact of energy-converting refrigeration systems on the environment. The results of a comparative analysis of TEWI and LCCP obtained for a medium-temperature vapor-compression heat pump unit (VCHP) operating on refrigerants R1234ze, R1336mzz (E), R600a and R744 are presented. R1336mzz (E) has the worst environmental indicators, because the total emission of equivalent CO2 for the entire period of the life cycle exceeds the same indicator for R600a by 4.2 times. The LCCP results show that system performance and equipment manufacturing emissions are the dominant drivers of CO2 emissions over the life of the SHP unit. The results of comparing refrigerants based on TEWI and LCCP are directly proportional and depend on the amount of energy consumed by the VCHP, which is also reflected in the energy efficiency indicators of the system. It is advisable to take into account the TEWI, LCCP and LCC criteria when comparing and selecting energy-converting refrigeration systems using the multi-criteria optimization method, which will help the user get a more informative understanding of the VCHP.

The effect of crop rotations and mineral fertilizers on economic and energy efficiency indicators when cultivating winter wheat in the Central Blackearth region

Economic efficiency is an integral method of analyzing agricultural technologies, especially against the rising prices for plant protection products, seeds, fertilizers, and fuels and lubricants. Identification and implementation of the most effective methods of field crops, growing using crop rotation and fertilizers remains an urgent task. The purpose of the current research was to study the effect of crop rotations and doses of mineral fertilizers on productivity of winter wheat grain, to analyze the economic and energy efficiency of its cultivation in the conditions of the Central Blackearth region. The study was carried out in the conditions of the experimental field of the Federal Agricultural Kursk Research Center in 2016, 2020. The soil of the experimental plot was typical medium-loamy, medium-humus blackearth (chernozem). The experimental scheme included such factors as grain-fallow-row crop, grain-grass-row crop, and grain-grass rotations; with doses of fertilizers or without fertilizers, N20P40K40 and N40P80K80. The weather conditions for the rotations of the studied crop rotations differed slightly. As a result of the study, there was found that winter wheat grain productivity in grain-grass and grain-grass-row crop rotations was 17.2 and 13.8 % lower than in grain-fallow-row crop rotation. When applying mineral fertilizers at a dose of N40P80K80, the largest winter wheat productivity was 4.52 t/ha. The lowest cost of grain was established in the grain-fallow-row crop rotation, which varied from 4.68 to 5.04 thousand rubles/t due to higher yields compared to other studied crop rotations and with a dose of N20P40K40 (4.68, 4.80 and 4.97 thousand rubles/t, respectively for crop rotations). A higher level of profitability of 113.7 % was observed in grain-fallow-row crop rotation with a dose of mineral fertilizers N20P40K40, a dose of N40P80K80 not allowing obtaining a high payback of fertilizers. The energy intensity of production increased with increasing doses of applied fertilizers; its minimum values were determined in grain-fallow-row crop rotation (1.35–2.77 GJ/t). Energy efficiency coefficients when applying a dose of N20P40K40 in crop rotations were higher than when applying N40P80K80.

Design and control intended low-order model for transient investigation of an electric oven: Static mode

In general, electric ovens represent a low-efficiency class among home appliances, contributing to overall environmental changes in buildings and apartments. To improve their low efficiency, which is typically between 10% to 12%, industries are increasingly focused on developing effective technologies. One suitable strategy is to design and control the oven's center temperature, as specified by the EN 60350-1 European standard, which regulates the energy efficiency index (EEI) test. The present simulation study explains the transient thermo-fluid behavior of a domestic electric oven subjected to free convection, i.e., static mode. For this purpose, appropriate dynamic models are employed, intended for design and control. A lumped-parameter based methodology is considered to develop a low-order dynamic model, resulting in reduced computational cost and run time. A finite level of discretization is introduced into the model, enabling the capture of limited insights, such as temperature, heat flux, mass flow rate, pressure drop, etc., particularly at the cavity center, internal and external cavity wall surfaces, and at suction and exit openings. The electric oven is mainly divided into four sub-systems: door, cavity, ventilation, and cabinet. Each sub-system has a suitable level of discretization signifying a lumped mass parameter to reproduce the transient behavior within the electric oven. Heaters are considered as individual lumped masses and are integrated within the cavity sub-system. The above sub-systems employ both the first principle equations and correlations based on experimental data, giving a low-order grey-box identity to the system. In addition to conduction and convection, a non-linear form of radiation is considered to increase model accuracy. The developed model is further calibrated with available physical data. Once calibrated, the model is then compared with the remaining physical data produced at different heat loads to understand the accuracy in terms of transient temperature prediction at various temperature set points.

Patial-temporal Analysis of Energy Efficiency of Different Transport Modes in China

This research employs stochastic frontier analysis (SFA) to investigate the development of transport energy efficiencies of railway, highway, water and civil aviation transport in different stages. In addition, total factor energy efficiency indicator (TFEE), technology efficiency change indicator (TECH) and frontier technology change indicator (TPCH) are introduced to further analyze the technology gaps among thirty studied provinces in China from 2000 to 2018. The results indicate that the transport energy efficiencies in China decrease from 2000 to 2010, which mainly caused by regional technological gaps. On the contrary, the transport energy efficiencies increase from 2011 to 2018 owing to the technological improvement. Furthermore, the energy efficiency of railway transport is the highest among four transport modes. The energy efficiency of highway transport is relatively low although highway transport takes a large proportion of all the intercity transports. Therefore, in order to make the development of transport more sustainable, it is necessary to narrow the technology gaps among the provinces and adjust the transport volume of different transport modes rationally.

Index modulation-based efficient technique for underwater wireless optical communications

This paper presents and experimentally demonstrates energy and spectral efficient index modulation (IM) scheme for underwater wireless optical communications (UWOC). The proposed scheme utilizes IM with direct-current optical orthogonal frequency division multiplexing which is based on discrete Hartley transform (DHT-OFDM) instead of conventional discrete Fourier transform-based OFDM (DFT-OFDM). Although DHT-OFDM has been previously studied in various applications such as optical and wireless communications, this is the first work that practically investigates it with the UWOC system. In this paper, we first demonstrate that DHT-OFDM can inherit all advantages of conventional DFT-OFDM with less computational complexity and higher robustness to the inter-carrier interference (ICI). Therefore, the DFT process is employed at receiving end instead of DHT to guarantee low-complexity frequency-domain estimation and equalization processing and ensure that shorter required pilot overheads are required to track the UWOC channel effects. Furthermore, IM-DHT-OFDM has been presented to provide better flexibility of spectral and energy efficiency (SE/EE) to UWOC and offers higher robustness to the ICI effect as the transmitted data is modulated and physically transmitted via some active subcarriers while others must be kept idle. For instance, IM-DHT-OFDM provides up to 50% spectral efficiency improvement compared to DFT-OFDM and DHT-OFDM with better performance over the UWOC system. Simulation and experimental tests, performed over 2-meter UWOC, are provided to demonstrate the outperformance of the proposed schemes against the existing benchmarks in terms of bit error rate (BER), achieved SE, peak-to-average ratio (PAPR), and computational complexity.

Влияние авторского метода виброакустического массажа поющими чашами на статокинетическую устойчивость

In the human population, statokinetic stability disorders are extremely common, although in the vast majority of cases they do not manifest themselves clinically. Such disorders can occur in the pathologies of the central and peripheral nervous systems as well as vestibular and musculoskeletal systems. In recent years, researchers have turned their attention to vibroacoustic massage with singing bowls as one of the methods used to improve the physiological functions of the human body. Of interest is the effect produced by vibroacoustic waves on the balance function, which is partly regulated by the vestibular system. A convenient, safe and objective way to assess the balance function is stabilometry, whose main parameters (length and area of the statokinesiogram, work, and centre of pressure sway velocity) directly reflect a person’s ability to keep the centre of mass in a relatively stable state. The purpose of this article was to study the influence of the author’s method of vibroacoustic massage with singing bowls on statokinetic stability, presented by stabilometric parameters. Materials and methods. The research was performed from November 2019 to March 2020 at the Urals State University of Physical Culture (Chelyabinsk). The subjects (n = 22) underwent a course of procedures according to the author’s method of vibroacoustic massage with singing bowls performed in line with the protocol of the state patent RU2687006C1 (author: Viktor O. Oguy). Stabilometric parameters were assessed before the course, immediately after the course and two weeks after the course using the ST-150 system (OOO Mera-TSP, Moscow) in the standard Romberg’s test and the combined Target Test. Results. It was established that this course of vibroacoustic massage with singing bowls provides a lasting improvement in energy efficiency index of posture control under complicated conditions as well as a temporary improvement in the balance function, which is manifested in increased statokinesiogram length and centre of pressure sway velocity in the Target Test with a fixed target.

Comparative assessment of energy efficiency indicators of a multi-fuel internal combustion vehicle and an electric vehicle

In the current discussions on the future of the automotive industry, two extreme opinions clash: electromobility or vehicles with conventional drive but powered by alternative fuels. The article discusses the issue related to modeling the energy efficiency factors of a combustion engine operating on three types of fuels (Diesel 100%, Biofuel 100%, and Hemp Oil 100%) as well as an electric drive powered by energy from a coal power plant. Analytical research was conducted based on the external characteristics of the engine's performance. The external characteristic of the Fiat Panda 1.3 JTD combustion engine was obtained on the Automex dynamometer. The engine operated on three fuels: Diesel 100%, Biofuel 100% (rapeseed), and Biofuel 100% (hemp oil). The Nissan Leaf vehicle manufacturer provided the external characteristics of the electric engine. The calculation results showed that the combustion engine consumes less energy at lower speeds than the electric one. At higher speeds, the consumption rates are at a similar level. The recipients of the research are both the demand side – that is, vehicle users, as well as future manufacturers and government institutions responsible for shaping and developing future mobility in the field of individual transport.

Energy poverty prediction in the United Kingdom: A machine learning approach

Energy poverty affects billions worldwide, including people in developed and developing countries. Identifying those living in energy poverty and implementing successful solutions require timely and detailed survey data, which can be costly, time-consuming, and difficult to obtain, particularly in rural areas. Through machine learning, this study investigates the possibility of identifying vulnerable households by combining satellite remote sensing with socioeconomic survey data in the UK. In doing so, this research develops a machine learning-based approach to predicting energy poverty in the UK using the low income low energy efficiency (LILEE) indicator derived from a combination of remote sensing and socioeconomic data. Data on energy consumption, building characteristics, household income, and other relevant variables at the local authority level are fused with geospatial satellite imagery. The findings indicate that a machine learning algorithm incorporating geographical and environmental information can predict approximately 83% of districts with significant energy poverty. This study contributes to the expanding body of research on energy poverty prediction and can help shape policy and decision-making for energy efficiency and social fairness in the UK and worldwide.

Yield and energy efficiency in winter wheat agrocenosis under different fertilization systems in the conditions of the northern part of the Forest-Steppe

The influence of different types of fertilizers on the yield and energy efficiency of winter wheat cultivation was evaluated. It was found that the highest productivity was obtained under the organic-mineral fertilizer system, which involves the combined use of 12 t/ha of cattle bedding manure and mineral fertilizers in a dose of N100Р60К100, applied against the background of two-time fertilization with complex chelated fertilizers at a dose of 2 l/ha, where the yield was 5.67 t/ha, and when applying a double mineral dose (N100Р60К100) and a triple dose (N150Р90К150) – 5.76 and 6.00 t/ha respectively, which in terms of yield growth was lower than the NIR05 values. The combined use of litter manure and mineral fertilizers resulted in a synergistic effect, as winter wheat grain yields were 15–20 % lower when mineral and organic fertilizers were applied separately than when they were applied together. Increasing NPK doses by 1.5 times to N150P90K150 compared to N100P60K100 did not compensate for the lack of manure. Under the organic fertilizer system, the grain yield was the highest when OMBF was applied at a dose of 2 t/ha against a background of pea straw 3 t/ha, which amounted to 5.18 t/ha with an increase of 41 %, compared to the control (straw). The highest levels of energy efficiency were determined for the application of organic-mineral fertilizer of the organic brand in doses of 1 and 2 t/ha (5.4 and 5.3) and OMBF brand 4-4-4 in a dose of 1 t/ha (5.2). Under the organic-mineral system of fertilizing application of N50P30K50 and N100P60K100 at the background of 12 t/ha of manure established the index of energy efficiency at the level of 3.4 and 3.7 units, respectively. Application of cattle manure at a dose of 12 t/ha did not provide a significant difference in crop energy, compared to the variant 6 t/ ha – 75755 and 73305 MJ/ha respectively, but due to increased energy inputs in production and application of more manure Kee was 3.9 and 4.6 respectively. Key words: cattle manure, fertilizers, OMBF, yield, mineral fertilizers, by-products, fertilizer system, energy efficiency.

The energy efficiency and environmental analysis of open-type commercial display cabinet with a multi-flow air curtain design

Open vertical display case refrigerators are often preferred as commercial refrigerators. This is because, despite their high energy consumption they have a higher marketing potential with the product display and offer easy access. Commercial refrigeration system accounts for half of the energy consumption in supermarkets. Air curtains of different designs are used in open vertical cabinets to reduce heat and mass transfer between the cooled air and the indoor environment. Hence, an experimental study was conducted to evaluate the multi-flow designed air curtain effects on the energy efficiencies of open display case-type commercial refrigerators. The experiments were conducted with ISO 23953:2005 standard in a controlled test room. During the trials, four different temperatures of air flowed to the refrigerator: +25 °C, +11 °C, +2°C, and 0 °C respectively through the air curtains. As a result of the experiments, a higher Coefficient of Performance COP value and lower Energy Efficiency Index (EEI) value were obtained with multi-flow air curtains. The multi-flow designed air curtain has nearly 40 % eliminated the air entrained from the outside to the indoor environment. It has ensured that the interior temperature values remain at the desired level. The second polyurethane body has reduced heat transfer through the surface by about 30 %, thereby reducing cooling load and energy consumption.

Investigating the thermal-hydraulic enhancement and ash deposition characteristics of leeward-cut spiral finned tube heat exchangers

The spiral finned tube (SFT) heat exchanger is a vital component in industrial boilers for energy utilization and recovery. To enhance its efficiency and reduce material usage, a leeward-cut spiral finned tube (LSFT) structure is proposed. In this study, LSFTs with different cutting angles are numerically simulated within the range of Re = 6800–10,850 using a CFD model, which is later validated using a self-developed experimental platform. The discrete phase model (DPM) coupled with the van Beek collision model is utilized to depict the ash deposition characteristics with different particle sizes on LSFTs. The results demonstrate that the LSFT outperforms SFT. The 60° cutting angle LSFT, for example, the Nu improves by 12% and the deposition density decreases 28.3% at Re = 9500 compared to SFT. The light gradient boosting machine (LightGBM) model and multi-objective particle swarm optimization (PSO) algorithm are adopted to optimize the design parameters including longitude and transversal tube pitch (sL, sT), fin high and pitch (Ph, Pf), cutting angle (θ). Compared with the original designed SFT, energy efficiency index JF increase by 15.1%–23.6% at various Re when using the optimized LSFT. Besides, the deposition density of particles in optimized LSFT decreases by 63.6%, while the overall weight lessens by 21%.

Condensation Performance of Symmetrical and Parallel Capsule Plate Heat Exchangers

Condensation characteristics of symmetrical and parallel capsule plate heat exchangers were experimentally investigated in this article. Plate heat exchangers with parallel capsule corrugation, symmetrical capsule corrugation, and chevron-type corrugation are manufactured as the test sections, each containing 41 plates. Pure steam and water are the hot and cold fluids, respectively. The experiments covered a range of equivalent Reynolds number from 9,000 to 25,000, mass flux of condensing fluid from to 18 to 49 kg/(m2·s), liquid Prandtl number from 1.37 to 1.71, average vapor quality from 0.5 to 0.7, and condensation pressure from 110 to 240 kPa. The correlations of condensation heat transfer coefficient and friction factor of the symmetrical and parallel capsule plate heat exchangers are developed. Compared with chevron-type plate heat exchangers, capsule plate heat exchangers show low friction pressure drop, and 33% higher energy efficiency index for condensation flow and heat transfer. Specifically, the energy efficiency index of the symmetrical capsule plate heat exchanger is 8.6% higher than that of the parallel capsule plate heat exchanger, indicating the superiority of counter-rotating longitudinal vortices over co-rotating longitudinal vortices in condensation, similar to what is observed in single-phase flow and heat transfer.

Дослідження взаємозв’язку показників екологічної та енергетичної ефективності на рівні країни

The world community strives to develop methods of assessing the most important factors of environmental impact, as well as to develop mechanisms for its adjustment in order to reduce greenhouse gas emissions to the minimum possible level. Increasing environmental efficiency should simultaneously contribute to increasing energy efficiency, which in turn can contribute to increasing the general living standard. When choosing energy-saving measures in industrial technologies, the primary fuel savings and the economic effect of the implementation of the up-to-date technologies are taken into account. This effect, as a rule, includes the cost of saved energy resources, a reduction in operating costs and a reduction in environmental tax. The ecological restrictions determined by Ukraine in the 2021 National Determined Contribution should be taken into account for forecasting primary fuel consumption. As a result, this consumption is limited by the greenhouse gas emissions, which in 2030 should not exceed 35 % compared to 1990. The purpose of the study is to upgrade the existing methodology of comprehensive assessment of energy-saving measures with new environmental restrictions and improved performance indicators based on the identification and formalization of the relationship between energy and environmental indicators. The analysis of the existing environmental indicators and regulatory environmental documents made it possible to choose the environmental indicator of specific CO2 emissions per GDP for the methodology of comprehensive assessment at the country level, to study the regression dependence between this indicator and the fuel capacity of GDP. This graphic analysis allows for determining the marginal fuel capacity of GDP in 2030, which will correspond to the accepted environmental restrictions. Thus, the method of comprehensive assessment of energy-saving measures should be developed for different hierarchical levels of the economy and take into account the marginal fuel capacity of GDP under environmental restrictions. Keywords: GDP energy intensity, specific CO2 emissions, energy efficiency indicators, ecological restrictions.