Statistical Method to Define Rational Heat Loads on Railway Air Conditioning System for Changeable Climatic Conditions

Radchenko, Andrii; Radchenko, Mykola; Trushliakov, Eugeniy; Kantor, Serhiy; Tkachenko, Veniamin

doi:10.1109/icsai.2018.8599355

Cited by 25 publications

(5 citation statements)

References 4 publications

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“…Following this approach, a rational design overall heat load is chosen to provide a maximum annular refrigeration capacity generation and shared into a comparatively stable and a remaining parts for ambient air precooling at varying heat loads [35,36].…”

Section: Methodsmentioning

confidence: 99%

An Innovative Air Conditioning System for Changeable Heat Loads

Trushliakov

Radchenko

Bohdal

et al. 2020

Lecture Notes in Mechanical Engineering

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The efficiency of air conditioning (AC) systems depends on the operation of their air coolers at varying heat loads in response to current changeable climatic conditions. In general case, an overall heat load of any AC system comprises the unstable range, corresponding to ambient air processing with heat load fluctuations, and a comparatively stable part for subsequent air subcooling. Following from this approach, a rational design overall heat load is chosen to provide a maximum annular refrigeration capacity generation and divided into a comparatively stable basic part and a remaining part for ambient air precooling at changeable heat loads. The ambient air precooling mode with considerable heat load fluctuation needs load modulation, whereas the comparatively stable heat load range can be covered by operation at about nominal mode. According to modern trend in AC systems the load modulation is performed by varying refrigerant feed to air coolers in Variable Refrigerant Flow (VRF) system. But with this the problem of inefficient operation of air coolers caused by dry-out of inner walls at the final stage of inside tube refrigerant evaporation followed by dropping the intensity of heat transfer remains unsolved. As alternative approach of the heat load modulation in AC systems there is a concept of incomplete refrigerant evaporation with overfilling air coils that leads to excluding a dry-out of inner surface of air coils and is realized through liquid refrigerant recirculation by injector (jet pump).

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Section: Methodsmentioning

confidence: 99%

An Innovative Air Conditioning System for Changeable Heat Loads

Trushliakov

Radchenko

Bohdal

et al. 2020

Lecture Notes in Mechanical Engineering

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“…A general way to increase the efficiency of power plants is to utilize the exhaust heat [1][2][3] and cool the working fluid [4] to provide favorable conditions for their efficient operation by application of waste heat recovery chillers [5,6] or electrically driven vapor compression refrigeration machines as in air conditioning system [7,8]. The air is a general working fluid in the majority of the power plants based on combustion engines, in particular, gas turbines [9,10], internal combustion engines [11,12], as well as in air conditioning systems as subsystems which provide processing (cooling) engine intake air or as autonomous systems in stationary [13][14][15] and transport application [16,17]. The various types of heat exchangers and feeding circuits are used for cooling air [18][19][20].…”

Section: Literature Reviewmentioning

confidence: 99%

Research of hydrodynamic processes in the flow part of a low-flow thermopressor

Konovalov,

Kobalava,

Radchenko

et al. 2024

Journal of Energy Systems

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This research explores the hydrodynamic processes within the flow section of a low-flow thermopressor as a jet-type heat exchanger that utilizes the instantaneous evaporation of highly dispersed liquid in accelerated superheated gas flow resulting in reducing gas temperature with minimum resistance losses in contrast to conventional surface heat exchanger. The efficiency of thermopressor, as a contact heat exchanger, is highly dependent on the design of the flow section and the water injection nozzle. Geometric characteristics perform a crucial role in shaping gas-dynamic processes along the length of the thermopressor's flow section, influenced by resistance losses and local resistance in the tapering and expanding channel segments. Therefore, the optimum thermopressor design has to ensure minimize pressure losses. Using Computational Fluid Dynamics (CFD), the prototype thermopressor models were simulated and the results were compared with experimental data. The empirical equations for local resistance coefficients of thermopressor diffuser and confuser were received to evaluate the impact of various design parameters. The obtained local resistance coefficients for the confuser ranged from 0.02 to 0.08 and for the diffuser – from 0.08 to 0.32. The practical recommendations on geometric and operating parameters and characteristics for enhancing the efficiency of hydrodynamic processes in thermopressor flow part were given.

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“…Основні положення методології вибору встановленої (проектної) холодопродуктивності холодильних машин (ХМ) СКПП в умовах нерівномірних теплових навантажень розглянуті в роботі [3].…”

Section: аналіз проблеми і постановка мети дослідженняunclassified

Аналіз Екологічної Ефективності Систем Кондиціювання Повітря Комбінованого Типу

Трушляков¹,

Radchenko²,

Фордуй

et al. 2019

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Since the supply air conditioning systems operation effect depends on the cooling duration and depth, it is quite justified to estimate it by the value of the specific annual cold production, which is the product of the necessary cooling capacity for cooling the air to the target temperature multiplied by duration of operation at a given cooling capacity and, thus, considers current climatic conditions. Obviously, the realization of the cooling potential (air conditioning) of the ambient air depends on the installed (design) cooling capacity of the air conditioning units, which, in turn, must considering fluctuations in thermal loads by the current variable thermal and humidity parameters of the ambient air. With an increase in the temperature of the ambient air, fuel consumption for the production of a unit capacity (mechanical/electrical energy) increases, and, accordingly, the more harmful substances are removed to the atmosphere with exhaust gases. To reduce the negative impact of unproductive fuel consumption during the operation of air conditioning systems at elevated ambient temperatures, resort to various methods for determining the installed cooling capacity of the installation, to reduce it. In the work, the ecological efficiency of air cooling is studied considering the climatic operating conditions for the Kyiv city that are variable during the year. The annual reduction in emissions of carbon dioxide CO2 and nitric oxide NOX was chosen as indicators for assessing the environmental effect of air cooling. It has been shown that when choosing the installed cooling capacity, by the method of ensuring the maximum growth rate of the annual cold production considering the increase in the installed cooling capacity of the chiller, there is a greater reduction in specific fuel consumption compared to the method of choosing the maximum annual cold production, respectively, and harmful emissions. When comparing the methods for choosing the design cooling capacity, air cooling to 15 °C provides a reduction in carbon dioxide CO2 emissions of more than 34 t for 2017 for the climatic conditions of Kiev, in favor of the method of ensuring the maximum growth rate of annual cold production, and nitric oxide NOX – about 5,8 t.

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Statistical Method to Define Rational Heat Loads on Railway Air Conditioning System for Changeable Climatic Conditions

Cited by 25 publications

References 4 publications

An Innovative Air Conditioning System for Changeable Heat Loads

An Innovative Air Conditioning System for Changeable Heat Loads

Research of hydrodynamic processes in the flow part of a low-flow thermopressor

Аналіз Екологічної Ефективності Систем Кондиціювання Повітря Комбінованого Типу

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