Development of an algorithm for determining the heat transfer coefficient of the body of an isothermal vehicle based on the results of analysis of the heat exchange processes occurring in it

Голубин, А. А.; Науменко, С. Н.

doi:10.21780/2223-9731-2017-76-5-306-311

Cited by 6 publications

(1 citation statement)

References 1 publication

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“…The determination of the heat transfer coefficients was carried out in works [27,28,[34][35][36][37][38][39][40][41]. The main difficulty is that part of the heat flux created by heating is dissipated into the environment, and measuring the heat flux through the structure under study presents a known difficulty.…”

Section: Methods Of Conducting Experimental Researchmentioning

confidence: 99%

Experimental Research of New Design Solutions for Fencing Refrigerated Wagon Bodies and Containers

Rahimov¹,

Abdullaev²

2024

Civil Engineering

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In this chapter, in order to select the directions of development and develop scientifically based technical solutions to improve the thermal parameters of the bodies of refrigerated wagons and containers for the transportation of perishable goods in the conditions of the Republic of Uzbekistan, experimental studies of new design solutions for fencing refrigerator bodies and containers have been carried out. For conducting experimental research a method of experimental determination of the body heat transfer coefficient using a closed thermally insulated chamber in the form of a parallelepiped with a replaceable upper face (cover) has been developed. As a result of comprehensive research using analytical calculations and field experiments, it was found that a promising option for thermal body fencing is a technical solution where polyurethane foam and “Corundum” are used as thermal insulation. The use of these technical solutions in the fences of refrigerated wagons bodies and containers will reduce the heat transfer coefficient by up to 20% and, accordingly, reduce the thickness of the fence by 20–30%, which will lead to an increase in the internal useful volume of the body, a decrease in its mass and consumption of materials used, and an improvement in the thermal state of the body.

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Section: Methods Of Conducting Experimental Researchmentioning

confidence: 99%

Experimental Research of New Design Solutions for Fencing Refrigerated Wagon Bodies and Containers

Rahimov¹,

Abdullaev²

2024

Civil Engineering

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The computer program for determining the heat transfer coefficient as a tool for saving fuel and energy resources

Голубин¹,

Науменко

2018

Vestnik Naučno-issledovatelʹskogo instituta železnodorožnogo tr

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The article shows the structure of the computer program “Express estimation system of the heat transfer coefficient for the vehicle”. The performance sequence of the automated calculation for determining the heat transfer coefficient ( K ) is described on the example of the refrigerator car body with the use of the data obtained during the accelerated thermal engineering tests. The advantages of the announced program are shown, consisting in a substantial reduction in the duration of testing, excluding the influence of the human factor when performing calculations and reducing the costs of organizing documentation flow. It was noted that for the operators of isothermal vehicles (ITV) the formation of an automated database with the calculated values results of K allows not only to monitor the dynamics of their changes during the ITV operations, but also with sufficient accuracy to predict the time of reaching the critical values of K , after which the regular energy installations will work with a significant expenditure of fuel and energy resources. The results of the expected economic efficiency in determining K by the accelerated method are presented; its value for the main types of ITV operating in the JSC “RZD” will be at least 14.0 billion rubles.

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Effect of measurement errors in determining the heat transfer coefficient of the enclosing structures of an isothermal car

Голубин¹,

Белова

Науменко

2019

Vestnik Naučno-issledovatelʹskogo instituta železnodorožnogo tr

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When conducting thermal tests, the purpose of which is to determine the heat transfer coefficient of the body of an isothermal car K, the study of measurement errors affecting the accuracy of the obtained value plays an important role. The results of such experiments may contain various measurement errors that can introduce significant deviations into the resulting values of the desired coefficient. Obtaining accurate results when conducting this kind of experiments is impossible without a preliminary study of the causes that affect the final result. The article presents the types of measurement errors that affect the accuracy of determining the heat transfer coefficient of the body of an isothermal car when conducting thermal tests. It was noted that the magnitude of labor costs and energy losses during the further operation of this body significantly depends on the accuracy of the value of this coefficient. It was emphasized that one of the main types of random errors arising from measurements and compliance with the established procedure for conducting typical thermal tests is a voltage drop (“slump”) in the electrical network, leading to significant errors in the calculations of the heat transfer coefficient of the isothermal car body. The values of this coefficient are presented, which were obtained as a result of heat engineering tests performed using the equilibrium mode method and the express method. It is shown that the use of the express method to determine the heat transfer coefficient of the bodies of isothermal cars reduces the risk of random errors due to the minimum experiment duration (from 5.5 h), allows to obtain exact values of the desired coefficient (with an error not higher than 3 % of its value of long-term equilibrium method) and use this data for practical purposes.

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Development of an algorithm for determining the heat transfer coefficient of the body of an isothermal vehicle based on the results of analysis of the heat exchange processes occurring in it

Cited by 6 publications

References 1 publication

Experimental Research of New Design Solutions for Fencing Refrigerated Wagon Bodies and Containers

Experimental Research of New Design Solutions for Fencing Refrigerated Wagon Bodies and Containers

The computer program for determining the heat transfer coefficient as a tool for saving fuel and energy resources

Effect of measurement errors in determining the heat transfer coefficient of the enclosing structures of an isothermal car

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