Climatic Conditions Of Operation Research Articles

Annual degradation rates and soiling losses of photovoltaic systems composed of recent crystalline silicon technologies in temperate climate

AbstractThe purpose of this study is to investigate the annual degradation rates of photovoltaic (PV) systems composed of PV modules based on recent crystalline silicon (c‐Si) PV technologies. We investigated the annual degradation rates of four PV systems composed of different c‐Si PV technologies, comprising p‐type multi‐crystalline silicon with a passivated emitter rear cell, n‐type silicon heterojunction, p‐type single‐crystalline silicon (sc‐Si) with an aluminum back surface field, and n‐type (sc‐Si) solar cell technologies. These systems were located in Gunma Prefecture in Japan and were measured over 6 years. Furthermore, the effects of soiling on the annual degradation rates of these PV systems were examined by partially surface cleaning the PV arrays two times. The results obtained indicate that the apparent annual degradation rates of the PV strings before surface cleaning were 0.8, 1.6, 1.4, and 1.2%/year, respectively, because of optical losses due to dust particles. However, the inherent annual degradation rates of the PV strings after surface cleaning were 0.1, 0.6, 0.0, and 0.3%/year, respectively. These low degradation rates indicate that the PV systems composed of the recent c‐Si PV technologies all offered reasonably stable performance that was reduced by 3.6%, 5.5%, 7.3%, and 4.8%, respectively because of the effects of surface soiling, although the surfaces of the PV arrays had been washed by plentiful rainfall under their humid subtropical climatic operating conditions.

ABCD method for determination of low-temperature properties of ordinary and modified binders

Introduction. The active introduction into practice of the system of volumetric and functional design (OFP) is aimed at the large-scale development by the Russian road construction industry of advanced foreign approaches to the technology of designing asphalt concrete pavements (Superpave). One of the fundamental differences between the OFP methodology and the previously established practice of evaluating technical, technological and operational indicators of road construction materials is the introduction of new methods that characterize quantitative indicators with a high degree of accuracy, based on the actual physical, chemical and mechanical properties of the components used. Thus, as methods for assessing the low-temperature properties of bitumen binders, it is proposed to use the bending beam method (BBR), which has proven itself quite well when working with traditional (ordinary) bitumen. However, the natural and climatic conditions of operation of highways in Russia clearly require the use of binders modified with high- and low-molecular compounds, including polymers. In this study, the task of applying the ABCD method to evaluate the low-temperature parameters of ordinary bitumen and polymer-bitumen binders was realized.Materials and methods. Samples of industrial batches of petroleum road viscous bitumen (GOST 33133-2014) and polymer-modified bitumen (GOST R 52056-2003) were used as objects of research. To determine the lowtemperature parameters, an ABCD 8.0 device and an air-cooled climate chamber were used. The study of bitumen binders according to the parameters laid down in the technical requirements of GOST R 58400.11–2019 ‘Automobile roads of general use. Petroleum-based bitumen binders. Method of determining the temperature of cracking using the device ABCD’ was carried out.Results. The values of the cracking temperature for ordinary and modified bitumen binders were determined. It is shown that the low-temperature parameters of polymer-bitumen binders significantly exceed similar properties of oxidized road bitumen.Discussion and conclusions. A comparative analysis of the low-temperature properties of ordinary and modified binders obtained during their determination by the direct method enables to confirm the effectiveness of the methodology developed in GOST R 58400.11-2019 for assessing the performance of binders of various component composition in difficult climatic conditions of Russia. The effectiveness of the domestic second-generation ABCD 8.0 device for direct assessment of the cracking temperature of bitumen binders of variable composition has been confirmed.

Исследование ударной вязкости стали литых несущих деталей грузовых вагонов

Objective: to conduct comprehensive experimental studies of the impact toughness of 20GL cast steel, which is used for the manufacture of load-bearing parts of freight cars. To obtain a serial diagram of the dependence of the impact toughness value on the test temperature. Methods: the method of mechanical testing of cast steel specimens under impact loading was used, which allows obtaining quantitative estimates of the material’s ability to resist impact fracture at different temperatures (impact toughness tests). Micrographic analysis of the fracture surface was used to study the surface of impact fracture. Results: based on the results of tests of specimens made of 20GL cast steel, experimental dependences P = f (τ); E = f (τ) and a serial diagram (KCV — T) were constructed, which allow evaluating the performance of cast steel in the manufacture of load-bearing parts of cars for various climatic conditions of operation. Practical significance: the results obtained allow us to carry out work to improve the technological and service properties of cast load-bearing parts of freight cars.

Comparative Agrotechnological Assessment of Disk Tillage Tools

Currently, in Krasnodar Territory, disk tools are most often used for surface tillage. The efficiency of using disk tools primarily depends on the design and technological layout of their working bodies, soil and climatic conditions of operation and the number of working passages through the field. The article presents an agrotechnical assessment of disk tillage tools based on open data from machine testing stations of the Russian Federation. Based on the results obtained, the main agrotechnical performance parameters that do not meet generally accepted requirements are determined.

Comparison of drying process of plantain bananas under natural sunny and confined oven environments: experiments and assessment of mathematical models

ABSTRACT In this paper, the drying process of plantain bananas from Democratic Republic of Congo (DRC) is investigated under two climatic operating conditions, the sunny and the confined oven environments. First, the effect of these environments at 40°C on the process evolution in terms of moisture content, particle size distribution of dried bananas and phytochemical properties (color, composition) is pointed out. Obtained results essentially show that natural sun drying is more favorable for all banana slice thicknesses used. The moisture content of plantain is reduced by 57.2% for natural drying in 28 h, while it is lowered by 52.76% for oven drying in 29 h. Phytochemical composition not detected for fresh bananas features an important quantity of sugar (433,4 ± 4,9 mg/g glucose) for sunny dried bananas and (60,8 ± 0,7 mg/g glucose) for oven drying. In contrast, the total polyphenol contents obtained using natural drying is less (1,78 ± 0,05 mg/g eq GA) and (3,05 ± 1,0 mg/g eq GA) for oven drying, even though the total lipids are mostly similar in both configurations (0,12 g/100 g) for natural drying and (0,13 g/100 g) for oven drying. Considering the impact of banana slice thickness, the use of small thicknesses is more affordable. Finally, the gathered data are used to fit in selected mathematical models for thin layer drying. It turns out that the models by Page (MR = exp(−0,1838t0,9795) and MR = exp(−0,5611t0,0025)) are the best fit to explain the moisture transfer in the DRC banana in the confined oven and in the natural sun environments, respectively. These results are novel as they determine for the first time the drying characteristics of the DRC plantain bananas (abb DRC) while providing their drying kinetics in the two environments under consideration.

КОРРЕКТИРОВАНИЕ ПЕРИОДИЧНОСТИ ОПЕРАЦИЙ ТЕХНИЧЕСКОГО СЕРВИСА МОБИЛЬНЫХ МАШИН С УЧЕТОМ ЖЕСТКОСТИ КЛИМАТА

Based on the analysis of the main operational factors, among which, for specific areas of equipment supply, one of the main ones is the climatic factor, as well as the main damaging degradation processes during the operation of machines, an effective mechanism for planning the frequency of maintenance operations is proposed, which helps to ensure a high level of technical readiness of machines. The operability potential was analyzed, its active, reserve and passive parts were considered, which made it possible to present a model for changing and restoring the operability potential of a mobile machine. Mathematical dependences are given for certain models of machines of the same functional purpose, as well as characterizing processes of reducing the potential of their performance in a certain external environment, their transformation is noted when changing natural and climatic operating conditions. The construction of a priori diagram of the ranks of climatic factors made it possible to note that the most significant adverse effect is exerted by temperature, humidity and solar radiation in the operating area. Taking into account the distribution of zones of technical rigidity of the climate, its score and the coefficient of continentality, a method is proposed for correcting the frequency of operations of technical service of transport-technological machines for the zone of their actual operation.

Building an algorithm for calculation of distances between overground gas pipeline supports of different diameters depending on climatic characteristics

The use of averaged norms in the process of performing engineering calculations of gas distribution systems significantly reduces the design time, but does not take into account the influence of climatic operating conditions of linear sections of the aboveground gas network. The paper considers the possibility of using a tabular model of the algorithm for determining the distances between the supports of aboveground gas pipelines of various diameters depending on climatic characteristics on the example of the Samara region. Examples of visualization of the information structure of computational algorithms by means of spreadsheets are given. A block diagram of an algorithm for calculating the values of average spans between aboveground gas pipeline supports for various climatic conditions is proposed. The advantages of using the proposed tabular modeling technique in engineering calculations of gas distribution systems are shown.

A multicriteria analysis of the potential degradations of a photovoltaic module to assess its robustness

Photovoltaic (PV) modules in service undergo more or less severe degradation depending on their operating environments, ages and technologies. In this work, we investigated the coupled influence of the climatic conditions of operation and of the degree of deterioration of a PV module on its energy production. We considered four silicon PV modules characterized in standard test conditions. The PV conversion is modeled by a single diode model taking into account the presence of a fault. Matlab/Simulink software was used to calculate the energy supplied at a constant load for the PV module with and without defects. The ratio between the energy produced with fault and without fault allowed to quantify the percentage of loss. This loss was plotted according to the degrees of degradation of the short-circuit current Isc, the open-circuit voltage Voc, the series resistance Rs and the shunt resistance Rsh. It is shown that when irradiance is held constant, the energy loss is lower with increasing temperature for Isc and Rsh, and vice versa for Voc and Rs. While the temperature is kept constant, the energy loss is lower when the irradiance increases for Isc and Rsh, and inversely for Voc and Rs. A multicriteria analysis enabled to determine the most robust module among the four ones.

Equivalent thermal resistance of the road surface

The design and construction of highways in the cryolithozone is associated with a number of difficulties, which are determined not only by geocryological and climatic operating conditions, but also by the complexity of the actual forecast of the thermal regime of road coverings and foundations. Many thermal calculations to substantiate technical solutions for the protection of highways in the cryolithozone from negative cryogenic phenomena are based on the determination and selection of a given thermal resistance of the structural layers of the pavement. The purpose of these studies was to assess the feasibility of using equivalent thermal resistance in modeling thermal processes and to determine the error in calculations that we make by replacing the layered pavement structure with an equivalent one. Simple engineering dependences are obtained that allow us to determine the error in calculations when using equivalent thermal resistance. The calculation of the thermal resistance of the three-layer construction of the pavement is made. It is established that for a three-layer pavement structure, the error value in the calculation of thermal resistance is directly related to the degree of deviation of the values of the thermal conductivity coefficient of the materials of individual layers from each other. Moreover, the parameters of the inequality of thermal conductivity coefficients for individual structural layers when determining the minimum calculation error are functionally related to each other. The results of variant numerical calculations are presented in the form of 3D and 2D graphs, which allow us to visually assess the influence of the studied parameters on the relative error of calculating the thermal resistance of the pavement.

A NEW METHOD FOR DETERMINING THE PERMISSIBLE WEAR OF PARTS, CONNECTIONS, MACHINE CONDITION PARAMETERS

The technical documentation contains a standard for permissible wear of machine parts. An indicator of the technical condition is a resource parameter that depends on the operating time or operating time of the selected part or node. (Research purpose) The research purpose is in developing a new methodology for determining the permissible wear of machine parts. (Materials and methods). When developing the method at the first stage, they tried to solve this problem economically, reducing the calculated costs of downtime, while optimizing the allowable wear. For the parts of the same name, the result gave large calculation errors, since they did not take into account the influence of different wear rates on reliability indicators, the probability of failure and service life. With an increase in the rate of wear, the probability of failure turns into the probability of preventive replacement. In order to increase the reliability of the results of the study, it is necessary to take into account the climatic conditions of operation. Since the standard is constant for all regions of the country, it is necessary to change its value for different regions. (Results and discussion). The article presents the dependence of the increase in operating time on the wear rate of a group of the same name; the lower the wear rate, the greater the operating time of such parts. The probability of failure also changes by changing the resource of these parts. (Conclusions). This technique makes it possible to reduce the probability of failure by five or more times during the inter-control period. This circumstance can make the diagnosed machine trouble-free, provided it is equipped with modern means of monitoring the technical condition.

PROBABILITY METHODS OF ANALYSIS OF ASSESSMENT OF THE CONDITION OF ROAD CLOTHES IN USE

This article is a continuation of the analysis of methods and criteria for assessing the condition of non-rigid pavement, which contains in its structural layers such hidden defects as cracks, material disintegration, violation of the structure of intermediate layers of monolithic material and others. The variety of models for assessing the condition of the pavement with destruction is explained by: variability of soil-geological, climatic conditions of operation of pavement; the variety of physical and mechanical characteristics of the materials of the structural layers of the pavement and the soil of the ground; heterogeneity of geometric parameters of pavements in the longitudinal and transverse profiles. According to many scientists to assess the condition of the pavement is a necessary condition for the use of methods of probabilistic analysis. Methods of designing and assessing the condition of the pavement structure must take into account the principles of reliability, including probabilistic methods of reliability analysis. Most of the considered probabilistic models for assessing the condition of pavement are focused on the design of new construction, which allows not to take into account the patterns of changes in physical and mechanical properties of materials of structural layers and their geometric parameters during operation. However, the most relevant is to assess the condition of pavement with damage, including hidden cracks. Much of the article is devoted to the analysis of this area of research. According to the results of the analysis, it is concluded that probabilistic methods allow to take into account the heterogeneity of parameters that characterize the stress-strain state of the pavement structure and can be used in models to assess the condition of pavement with cracks in layers of monolithic materials.

Dependence of thermogasodynamic parameters of operation of a helicopter gas turbine engine on its operation and dust in the atmosphere

By scanning the blades of the impeller and the guide devices of the full-scale compressor of the helicopter gas turbine engine, a solid-state design model of the compressor with a tunable geometry in the height of the blades was developed. The empirical dependencies of the values of nonlinear wear of the blade of the 1st stage of the compressor on the operating time and the concentration of dust in the air are presented. A block diagram of the procedure for calculating the characteristics and parameters of a helicopter gas turbine compressor is presented. When calculating the flow in the gas–air path of the compressor, the numerical solution of the Navier–Stokes equations averaged by Reynolds, the finite element method in combination with the establishment of patterns of erosive wear of the blades depending on the operating conditions of the engine is used. Mathematical dependencies of the thermogasodynamic parameters of the helicopter gas turbine compressor operation on its operating time and the dustiness of the atmosphere are obtained using modeling. The obtained results can be used in the development of a methodology for automated monitoring of the wear condition of the compressor blades of a helicopter gas turbine engine according to its thermogasodynamic parameters, applied to various climatic operating conditions.

Розробка програмного комплексу раціонального проектування систем охолодження на основі термопресорних технологій

The most common way to increase power and reduce fuel consumption by modern power plants is contact cooling of a gas or air flow by water injection. A promising development of this direction is to use aerothermopressor technologies. The use of heat air, which is compressed by the power plant compressors, accelerates the flow to a speed close to the sound one and almost instantaneous evaporation of injected water (the effect of thermo-gas-dynamic compression). It is important to determine the rational parameters of the organization of thermophysical and hydrodynamic processes when developing such technologies. In this case, one should be taken into account the appropriate development of the flow path design and a special software product. It is necessary to use methods and means to determine the optimal operating parameters of the power plant heat recovery systems. This paper presents a block diagram and an algorithm of a rational methodology for designing an aerothermopressor, which makes it possible to accurately determine the efficiency of using an aerothermopressor as part of a power plant (based on a gas turbine engine) for cooling cycle air, considering the peculiarities of operating modes in the flow path, as well as under various climatic operating conditions. The algorithm of a rational methodology for designing aerothermopressor technologies allows calculating the characteristics of equipment, systems, and circuit design solutions when used as part of a power plant: an electric generator; heat-using refrigerating machines (ejector refrigerating machines, absorption refrigerating machines); turbine generator or steam generator as part of a trigeneration unit or as part of a turbo-compound unit (power plants of marine vessels); recovery boiler of one or two pressures. Modeling the aerothermopressor-cooling system operation makes it possible to reveal the effectiveness of using such a system as part of a power plant and compare it with traditional methods of cooling and humidifying cycle air.

DEVELOPMENT OF MEASURES TO IMPROVE THE OPERATIONAL EFFICIENCY OF AUTONOMOUS LIGHTING COMPLEXES FOR UKRAINIAN HIGHWAYS

Reducing highway hazards through the creation of modern lighting systems is an important practical task that currently has some difficulties. The rapid development of renewable energy makes it possible to use off-the-shelf solutions to create autonomous lighting complexes for unregulated pedestrian crossings. The analysis of peculiarities of design, constructive structure and operation of autonomous lighting complexes, which are located in Kharkiv region and use renewable energy sources and energy storage systems to power lighting devices and flashing signal lights, is carried out. The analysis results showed that the lighting complexes under investigation are not capable of supplying sufficient energy for themselves and of functioning properly at low insolation and low ambient temperatures. The reasons for the unstable operation of autonomous lighting complexes have been identified, with the main one being the insufficient accuracy of taking into account the actual climatic operating conditions of facilities when forming design solutions. Measures have been developed to improve the efficiency of the autonomous lighting complexes under study, involving the use of off-the-shelf technical solutions based on modern tools and technologies. A criterion for sufficiency of the developed measures to solve the problem of autonomous power supply of lighting complexes for highways is proposed. The sign of the resulting capacity of the complex over the calculation time period is taken as a sufficiency criterion. The practical use of the developed criterion confirmed the feasibility of the proposed measures to improve the operational efficiency of the investigated autonomous lighting complexes for highways. Calculations have shown that it is not sufficient to use solar panels alone to supply highway lighting complexes located in regions with unstable levels of insolation. The feasibility of hybrid power supply systems for autonomous lighting complexes that use additional power sources such as wind turbines and systems with electromechanical converters in addition to solar panels has been quantitatively confirmed.

Effect of Nozzle Angel & Cyclic Pressure Head Variation on Water Distribution Uniformity for Stationary Sprinkler Systems

The present research included studying the effect of the sprinkler nozzle angle and cyclic variation of the operating pressure head on the uniformity of water distribution for many sprinkler heads spacing with rectangular and triangular sprinkler heads arrangement for different sprinkler heads. The research conducted 40 tests to measure a single sprinkler water distribution pattern under similar climatic operating conditions by adopting the water distribution pattern along a beam that represents the radius of the wetting circle which its center is a sprinkler head for different sprinkler nozzle angles (Ɵ + 5 °, Ɵ + 3.5 °, Ɵ, Ɵ -3.5 °, Ɵ -5 °) and the constant-cyclic operating pressure head conditions for different sprinkler heads. 320 patterns were found for field water distribution pattern and uniformity coefficient for four different spacing with a rectangular and triangular sprinkler heads arrangement for the sprinkler heads and the measured water distribution patterns. The research revealed that 70% of the uniformity coefficients in the rectangular arrangement are greater or equal to its value in a triangular arrangement. The increase in the nozzle angle results in increasing the uniformity coefficient of 1.4% for each degree, an increase in the nozzle angle, and can reach 2.4% for each degree for a specific spacing, arrangement, and sprinkler head. Also, the difference between the two water distribution patterns in the case of operating with constant pressure head and variable pressure head is slight, but it shows in the values of the uniformity coefficient, where the maximum difference reaches 10%, and in general, the best in the values of the uniformity coefficient requires determining the nozzle angle, the spacing and the arrangement of sprinkler head as well as the case of operating pressure head constant or variable.

Influence of cooling air selections on the efficiency of a gas turbine installation

A gas turbine installation (GTI) consists of 5 main parts: an input device, a compressor, a combustion chamber, a gas turbine, and an output device. In this work, due to the lack of sufficiently extensive information about stationary GTI, data from the characteristics of aviation GTI were partially used. The GTI operation efficiency is influenced by many factors, among which, apparently, the determining factor is the degree of air compression in the compressor π К . Of course, the compression ratio depends on the design scheme of the gas turbine, the type of fuel, the climatic conditions of operation, and others. The most important operational parameter of the GTI is the effective power NP and specific fuel consumption bud . The article provides a numerical analysis of the effect π К on NP and bud under variations in the temperature of gases at the turbine inlet T3 , as well as the influence of other factors, including the selection of part of the air for cooling high-temperature surfaces of the structure. The conclusions were made based on the calculations, the results of which are shown in the tables, and in the comparison graphs of obtained results.

ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГТД ХОЛОДИЛЬНИМИ МАШИНАМИ ШЛЯХОМ АКУМУЛЯЦІЇ ХОЛОДУ

The efficiency of air cooling at the inlet of gas turbine engines by exhaust heat conversion chiller, which transforms the GTE exhaust gases heat into cold, under variable climatic operating conditions, has been investigated. Considered is the use of a combined absorption-ejector exhaust heat conversion chiller with a step-by-step principle of air cooling at the gas turbine engines inlet: preliminary down to 15°C – by an absorption lithium-bromide chiller (ACh), which is used as a high-temperature air cooling stage, and further cooling down to 10°C – by a refrigerant ejector chiller (ECh) as a low-temperature cooling stage. Reserves have been identified for reducing the design (installed) refrigeration capacity of chillers by accumulating excess cold at reduced current heat loads with its use at increased heat loads. In this case, the design (installed) refrigeration capacity of chillers was determined by two methods: the first – based on the close to the maximum reduction in annual fuel consumption, the second – according to the maximum rate of increase in the reduction in annual fuel consumption. A scheme of the air cooling system at the gas turbine engines inlet using the refrigeration capacity reserve of the ACh, which provides preliminary cooling of the ambient air at the gas turbine engines inlet, in the booster stage, using the ACh accumulated excess refrigeration capacity has been proposed. The ACh excess refrigerating capacity, which is formed at decreased heat loads on the air coolers at the gas turbine engines inlet, is accumulated in the cold accumulator and is used at increased heat loads. The simulation results show the advisability of using the air cooling system at the gas turbine engine inlet with using the ACh accumulated excess refrigeration capacity, which allows reducing the ACh design (installed) refrigeration capacity by approximately 40%.

Experience in the development of an effective thermal management system for the high-voltage battery of the vehicle

For the effective operation of the vehicle, which includes a high-voltage battery (HVB), it is first necessary to understand what conditions it is designed for. There are a number of criteria for the selection of HVBs for vehicles. One of them is the thermal management system, which ensures the operation of a HVB in optimal temperature mode. In HVBs, it is necessary to maintain an optimum temperature for maximum efficiency and service life. The article discusses the preferred thermal management system of the main manufacturers of vehicles with HVB. The technical solutions, the applied designs and the development trends of the designs of the temperature control of HVBs are described. On the basis of the considered structures, operating conditions and prospects for the development of the market for such vehicles, the concept of creating an effective thermal management system for HVBs for projected vehicles has been proposed. A classification of the thermal management system of HVBs as part of a vehicle, depending on the climatic conditions of operation, is proposed. One of the developed variants of perspective designs of high-voltage batteries of a vehicle operated in a wide range of temperatures is presented.

МОДЕЛИРОВАНИЕ ДВИЖЕНИЯ АВТОМОБИЛЯ В ТРАНСПОРТНОМ ПОТОКЕ НА ЭВМ

In this work, a critical analysis of the mathematical model of the Traiber is performed and a new model is developed, based on the concept of "following the leader" and which allows you to take into account the dynamic characteristics of a particular car, its load, road and climatic conditions of operation, as well as more realistic modeling of acceleration processes. braking and stopping the vehicle.

ПОРІВНЯННЯ ХАРАКТЕРИСТИК ГЛИБОКОГО ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГТУ ДЛЯ РІЗНОГО ТИПУ КЛІМАТУ

The efficiency of deep air cooling at the inlet of gas turbine units has been investigated for changed climatic conditions of operation during the month. For air cooling, the use of waste heat recovery chiller has been considered, which transform the heat of exhaust gases of gas turbine units into the cold. The efficiency of air cooling at the inlet of gas turbine units to different temperatures has been analysed: to 15°C – an absorption lithium-bromide chiller, which is used as the first pre-cooling stage of ambient air and down to 10°C – a combined absorption-ejector chiller, with ejector refrigerant chiller as the second stage of air cooling.The air cooling efficiency is estimated for different climatic conditions: a temperate climate on the example of Odessa (Ukraine) and a subtropical climate for Guangzhou (China). The subtropical climate peculiarity of Guangzhou is the high relative humidity of the air, respectively, and its moisture contents at the same time its high temperatures. As an indicator, when evaluating the efficiency of air cooling at the inlet of gas turbine units to 15°C in an absorption lithium-bromide chiller and deep cooling of air to 10°C in a combined absorption-ejector chiller, the specific fuel consumption reduced has been used. In this case, the needs for specific production of refrigeration capacity and specific capacity of cooling towers for cooling waste heat recovery chillers when cooling air to different temperatures are compared. It is shown that, through extremely different thermal and humidity parameters of ambient air, its cooling at the inlet of gas turbine units to 10ºС for the climatic conditions of Ukraine provides the current decrease in specific fuel consumption due to deeper cooling of the air at the inlet of the GTU in 1.6 ... 1.7 times compared with cooling to 15ºС, and for climatic conditions of the PRC - 1.4 ... 1.45 times. However, it should be noted that a deeper cooling of the air at the inlet of the gas turbine unit to a temperature of 10°C in a combined absorption-ejector chiller compared to its traditional cooling to 15°C in an absorption bromine-lithium chiller requires an increase in the required specific amount of cold by 1.7 ... 2, 0 times and the required specific capacity of cooling towers for cooling chillers by 2.6 ... 3.0 times for the climatic conditions of Ukraine, while for China - 1.25 ... 1.3 and 1.5 ... 1.6 times, respectively.