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Journal articles on the topic 'Refrigeration industry Mathematical models'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

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1

Tai, Yanni, Haibin Qu, and Xingchu Gong. "Design Space Calculation and Continuous Improvement Considering a Noise Parameter: A Case Study of Ethanol Precipitation Process Optimization for Carthami Flos Extract." Separations 8, no. 6 (2021): 74. http://dx.doi.org/10.3390/separations8060074.

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The optimization of process parameters in the pharmaceutical industry is often carried out according to the Quality by Design (QbD) concept. QbD also emphasizes that continuous improvement should be performed in life cycle management. Process parameters that are difficult to control in actual production can be regarded as noise parameters. In this study, based on the QbD concept, the ethanol precipitation process of Carthami Flos extract was optimized, considering a noise parameter. The density of the concentrated extract, ethanol concentration, the volume ratio of ethanol to concentrated extr

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2

Lawrence O Agidike, Godslove I Ebiega, Ovis D Irefu, and Seyi J Fanifosi. "Development of a PID-Controlled Refrigeration System for Reduced Power Consumption." World Journal of Advanced Research and Reviews 24, no. 1 (2024): 2435–49. http://dx.doi.org/10.30574/wjarr.2024.24.1.3143.

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Refrigerator systems are used for food preservation as well as other applications. However, the cost of running the system is high due to rising fuel and electricity prices. Traditionally, these systems are controlled by On/Off controllers. This study proposes the use of a proportional-integral-derivative (PID) controller algorithm to reduce costs for domestic and industrial refrigeration without negatively affecting the system performance. To accomplish this, a physical model was developed, comprising a domestic refrigerator, microcontroller, and MATLAB computer software for analysis. A mathe

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Lawrence, O. Agidike, I. Ebiega Godslove, D. Irefu Ovis, and J. Fanifosi Seyi. "Development of a PID-Controlled Refrigeration System for Reduced Power Consumption." World Journal of Advanced Research and Reviews 24, no. 1 (2024): 2435–49. https://doi.org/10.5281/zenodo.15063139.

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Refrigerator systems are used for food preservation as well as other applications. However, the cost of running the system is high due to rising fuel and electricity prices. Traditionally, these systems are controlled by On/Off controllers. This study proposes the use of a proportional-integral-derivative (PID) controller algorithm to reduce costs for domestic and industrial refrigeration without negatively affecting the system performance. To accomplish this, a physical model was developed, comprising a domestic refrigerator, microcontroller, and MATLAB computer software for analysis. A

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4

Sadhan, Jyoti Dutta. "Understanding the Fundamentals of Microwave Processing: A Brief Study of Basic Engineering Mathematical Models." Chemical Axis 21, no. 1 (2022): 84. https://doi.org/10.5281/zenodo.6635049.

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The study of foods has been an interesting subject since the history of mankind, be it intentionally or unintentionally. The way humans evolved has a lot to do with what and how humans consumed the food over the course of time. It all began when the early humans discovered fire and used it as a means to cook the raw food which eventually resulted in tastier foods. Overtime, humans became smarter and their fascination with science led them to discover the unknown and unseen principles of nature that surrounds us all. He began using these principles to his own advantage and one of the purposes w

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Gabibov, Ibrahim Abulfaz, Rabiya Seydulla Nadjafkulieva, and Sevinj Malik Abasova. "MODELING THE HEAT TRANSFER PROCESS IN REFRIGERATION UNITS USED IN THE OIL INDUSTRY." EUREKA: Physics and Engineering 6 (November 30, 2019): 57–62. http://dx.doi.org/10.21303/2461-4262.2019.001056.

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Currently, the main volume of associated petroleum gas production in Azerbaijan is carried out at offshore fields. About 30 % of this volume is used for SOCAR’s own technological needs of the oil company (to maintain the level of oil production). And the rest are transported to onshore facilities and further for processing to a gas processing plant. Subsequently, dry and purified gas is sent through a gas pipeline system for use by the population, or to a network of trunk pipelines for further export. When gas is transferred to the gas lift system and ashore, it is compressed in compressors, a

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Ibrahim, Abulfaz Gabibov, Seydulla Nadjafkulieva Rabiya, and Malik Abasova Sevinj. "MODELING THE HEAT TRANSFER PROCESS IN REFRIGERATION UNITS USED IN THE OIL INDUSTRY." EUREKA: Physics and Engineering 6 (November 30, 2019): 57–62. https://doi.org/10.21303/2461-4262.2019.001056.

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Currently, the main volume of associated petroleum gas production in Azerbaijan is carried out at offshore fields. About 30 % of this volume is used for SOCAR’s own technological needs of the oil company (to maintain the level of oil production). And the rest are transported to onshore facilities and further for processing to a gas processing plant. Subsequently, dry and purified gas is sent through a gas pipeline system for use by the population, or to a network of trunk pipelines for further export. When gas is transferred to the gas lift system and ashore, it is compressed in com

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Никитин, В. В., А. Н. Сучков та А. Г. Белозеров. "Научное обоснование и разработка прогностической модели определения остаточного срока годности упакованного под вакуумом мяса". Food processing industry, № 5 (29 квітня 2025): 48–53. https://doi.org/10.52653/ppi.2025.5.5.008.

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В данной статье проведен комплексный анализ влияния субкриоскопических температур на микробиологические процессы в упакованном под вакуумом, охлажденном и подмороженном мясе свиней. Исследования проводились на образцах M. longissimus dorsi массой 1,5–2,0 кг, выработанных из мяса свиней 2-й категории упитанности. Целью настоящего исследования являлась разработка прогностических моделей, позволяющих оценить остаточный срок годности мясных продуктов в зависимости от условий их хранения. В ходе экспериментов было установлено, что снижение температуры хранения вакуумно-упакованного, охлажденного мя

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Ke, Hanbing, Yuansheng Lin, Zhiwu Ke, et al. "Analysis Exploring the Uniformity of Flow Distribution in Multi-Channels for the Application of Printed Circuit Heat Exchangers." Symmetry 12, no. 2 (2020): 314. http://dx.doi.org/10.3390/sym12020314.

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The maldistribution of fluid flow through multi-channels is a critical issue encountered in many areas, such as multi-channel heat exchangers, electronic device cooling, refrigeration and cryogenic devices, air separation and the petrochemical industry. In this paper, the uniformity of flow distribution in a printed circuit heat exchanger (PCHE) is investigated. The flow distribution and resistance characteristics of a PCHE plate are studied with numerical models under different flow distribution cases. The results show that the sudden change in the angle of the fluid at the inlet of the chann

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9

Baglivo, Cristina, Paolo Maria Congedo, and Pasquale Antonio Donno. "Analysis of Thermodynamic Cycles of Heat Pumps and Magnetic Refrigerators Using Mathematical Models." Energies 14, no. 4 (2021): 909. http://dx.doi.org/10.3390/en14040909.

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This paper proposes a critical review of the different aspects concerning magnetic refrigeration systems, and performs a detailed analysis of thermodynamic cycles, using mathematical models found in the literature. Langevin’s statistical mechanical theory faithfully describes the physical operation of a refrigeration machine working according to a magnetic Ericsson cycle. Results of mathematical and real experimental models are compared to deduce which best describes the Ericsson cycle. The theoretical data are not perfectly consistent with the experimental data; there is a maximum deviation o

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Tršelič, Ivana, and Jurij Avsec. "A CASE STUDY OF EXERGY ANALYSIS OF WASTE HEAT RECOVERY IN REFRIGERATION SYSTEM." Journal of Energy Technology 7, no. 2 (2024): 53–66. https://doi.org/10.18690/jet.7.2.53-66.2014.

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From an energy perspective, refrigeration systems employ a wasteful process; nevertheless, the food industry depends on refrigeration systems. To improve the efficiency of this process, a refrigeration system can be combined with a heating system, by using the waste heat from the condenser of the refrigeration system in the heating system. A case study of the application of a waste heat recovery system is considered in this paper. The conserved energy for three years is calculated, based on the literature, i.e. practical engineering articles. The numbers given are compared with the case study.

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D.K., Joshi. "Geometrical and Process Parameters Affecting Performance of Ejector Refrigeration System- A Study." Research and Applications of Thermal Engineering 2, no. 3 (2019): 1–8. https://doi.org/10.5281/zenodo.3406941.

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<em>Ejector refrigeration system has been used usually because of its simple configuration with no moving parts. Ejector is crucial part of ejector refrigeration system. Design of ejector sturdily affects the performance of refrigeration system. Available past and present literature and up to date information on in ejector refrigeration system were studied. To analyze the effect of exit nozzle position (NXP) on the ejector performance Some of researches have carried out experiments and paid attention 0n selections of working fluid, mathematical modelling, geometrical and operation conditions o

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12

Mani, Kolandavel, Vellappan Selladurai, and Natarajan Murugan. "Experimental investigations with eco-friendly refrigerants using design of experiments technique-mathematical modeling and experimental validation." Thermal Science 18, suppl.2 (2014): 363–74. http://dx.doi.org/10.2298/tsci110805114m.

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In this paper mathematical models were developed using design of experiments technique for the performance prediction of refrigeration system parameters such as refrigerating capacity, power consumption and coefficient of performance. The models developed were checked for their adequacy using F-test. The performances of vapour compression refrigeration system with different refrigerants R12, R134a and R290/R600a were compared. The R290/R600a mixture showed 10.7-23.6% higher coefficient of performance than that with R12 and R134a and it was found that the hydrocarbon mixture with 68% propane an

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13

Wang, Lin, Xiao Long Cui, Ying Ying Tan, and Yu Wang. "Study on Energy Efficiency of a Low Temperature Refrigeration System." Applied Mechanics and Materials 71-78 (July 2011): 292–95. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.292.

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Based on conservation of mass, total mass balance equation and component mass balance equation, mathematical models of thermodynamic for the auto cascade refrigeration cycle are established. Thermophysical properties in solving the governing equation are called from the NIST REFPROP7.0. Thermodynamic properties of the auto cascade refrigeration cycle using binary mixtures, namely, R170/R290, R23/R227ea, R116/R134a, R23/R134a, R170/R600a, R170/R600 and R170/R152a as refrigerants is evaluated. R170/R600a is selected for the low temperature refrigeration system, and the influences of cycle mole f

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14

Gonçalves, R. S. R., B. Jacob-Furlan, E. C. Kollross, et al. "A MATHEMATICAL MODEL OF AN ABSORPTION REFRIGERATION SYSTEM FOR A REFRIGERATED STORAGE FOR FISHING BOATS." Revista de Engenharia Térmica 21, no. 1 (2022): 25. http://dx.doi.org/10.5380/reterm.v21i1.86688.

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The objective of this paper is to determine if it is possible to refrigerate an area by means of a heat source. Theory determines that an absorption refrigerator can work as a possible solution through a refrigeration fluid. According to it, the system works by the evaporation or condensation of the working fluid. The traditional process consists of using engine fuel to run an electric compressor and by its means achieve refrigeration. That process has its toll on fuel economy and engine efficiency and the refrigeration fluid damages the ozone layer or is based on the transportation of ice pre

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15

Syazin, Ivan Evgen'evich, Gennadiy Ivanovich Kas'yanov, and Aleksandr Valerievich Gukasyan. "Osobennosti teplovogo rascheta porshnevogo kholodil'nogo kompressora." Refrigeration Technology 109, no. 6 (2020): 20–24. http://dx.doi.org/10.17816/rf104046.

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Designing refrigeration reciprocal compressors is a knotty engineering problem. Refrigeration reciprocal compressors differ considerably from the gas ones. To calculate refrigeration reciprocal compressors specially developed mathematical models, which are described in educational and scientific literature, are used. A number of hairy calculations should be performed when designing a compressor. One of them is a thermal calculation intended for determining the baselines of the designed compressor, which will be the basis for following calculations such as gasdynamic, dynamic, strength ones, et

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16

Pérez-Gomariz, Mario, Antonio López-Gómez, and Fernando Cerdán-Cartagena. "Artificial Neural Networks as Artificial Intelligence Technique for Energy Saving in Refrigeration Systems—A Review." Clean Technologies 5, no. 1 (2023): 116–36. http://dx.doi.org/10.3390/cleantechnol5010007.

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The refrigeration industry is an energy-intensive sector. Increasing the efficiency of industrial refrigeration systems is crucial for reducing production costs and minimizing CO2 emissions. Optimization of refrigeration systems is often a complex and time-consuming problem. This is where technologies such as big data and artificial intelligence play an important role. Nowadays, smart sensorization and the development of IoT (Internet of Things) make the massive connection of all kinds of devices possible, thereby enabling a new way of data acquisition. In this scenario, refrigeration systems

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17

Yang, Qichao, Xiaonan Chen, Weikai Chi, Liansheng Li, Guangbin Liu, and Yuanyang Zhao. "Thermodynamic Analysis of an NH3/CO2 Cascade Refrigeration System with Subcooling in the Low-Temperature Circuit Utilizing the Expansion Work." International Journal of Energy Research 2023 (February 27, 2023): 1–17. http://dx.doi.org/10.1155/2023/5987368.

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NH3/CO2 cascade refrigeration system is recognized one of the most promising technologies in low-temperature application. In this paper, a NH3/CO2 cascade refrigeration system with subcooling in low-temperature circuit driven by recovery expansion work has been proposed. The aim of this study is to investigate the proposed cascade refrigeration system compared with conventional cascade refrigeration system. Mathematical models based on energy conservation and exergy balance are established. The selection of different refrigerants in auxiliary subcooling system is discussed. The effects of oper

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18

Yang, Shutong, Youlei Wang, and Yufei Wang. "Optimization of Cascade Cooling System Based on Lithium Bromide Refrigeration in the Polysilicon Industry." Processes 9, no. 9 (2021): 1681. http://dx.doi.org/10.3390/pr9091681.

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Cascade cooling systems containing different cooling methods (e.g., air cooling, water cooling, refrigerating) are used to satisfy the cooling process of hot streams with large temperature spans. An effective cooling system can significantly save energy and costs. In a cascade cooling system, the heat load distribution between different cooling methods has great impacts on the capital cost and operation cost of the system, but the relative optimization method is not well established. In this work, a cascade cooling system containing waste heat recovery, air cooling, water cooling, absorption r

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19

James, K. A., and R. W. James. "Transient analysis of thermostatic expansion valves for refrigeration system evaporators using mathematical models." Transactions of the Institute of Measurement and Control 9, no. 4 (1987): 198–205. http://dx.doi.org/10.1177/014233128700900406.

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20

Ge, Y. T., and S. A. Tassou. "Mathematical modelling of supermarket refrigeration systems for design, energy prediction and control." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 214, no. 2 (2000): 101–14. http://dx.doi.org/10.1243/0957650001538218.

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This paper describes a mathematical model developed to simulate the performance of supermarket refrigeration systems. Such a model can be used for the comparison of different systems and control strategies in terms of their energy and total equivalent warming impact. The model is based on a large number of component models which have been linked together within the TRNSYS environment. Major component models include the compressor, air-cooled condenser, thermostatic expansion valve, display cabinet and control. The overall system model has been validated against monitored data obtained from bot

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21

Giovannini, Michael, and Marco Lorenzini. "Numerical Model of an Evaporative Condenser for the Food Refrigeration Industry." Journal of Physics: Conference Series 2177, no. 1 (2022): 012009. http://dx.doi.org/10.1088/1742-6596/2177/1/012009.

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Abstract Evaporative condensers play a key role in refrigeration plants for industrial applications, as they are needed to dispose of the thermal and electric power required by the process. Modelling them as lumped capacitance systems is very expedient when trying to simulate e. g. the steady-state and dynamic behaviour of the whole refrigeration plant, but at the expenses of loss of information and often oversimplifying assumptions. This paper analyses two models for heat and mass transfer in cooling equipment, Poppe’s and its earlier, simpler version, Merkel’s. The two approaches are applied

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22

Liu, Yan Ling, Ling Qun Wang, and Zai Zhong Xia. "Design and Performance Study of a Novel Refrigeration System." Advanced Materials Research 354-355 (October 2011): 819–27. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.819.

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In order to solve the problems of pressure drop and leakage in the refrigerant circuit, a novel continuous adsorption system suited to use low heat source (75-85 oC) was designed and set up. To analyze and compare with the conventional system to reveal the similarity and difference, this paper sets up the mathematical models for these two systems. The adsorbers, condensers and evaporators in these two systems are exactly the same and the two systems are compared by working at the identical conditions, which is not feasible in real experimental lab. All the parameters and models used in this ca

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23

Zhao, Shibo, Yonghui Zhang, Yunqi Nie, Pengyu Qu, and Wenqiang Sun. "Performance of an internet data center refrigeration system using an evaporative cooler." E3S Web of Conferences 194 (2020): 01027. http://dx.doi.org/10.1051/e3sconf/202019401027.

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The traditional refrigeration method of internet data center (IDC) is mostly air refrigeration, which has undesired cooling effect and high power consumption. This study addresses this problem and proposes an evaporative air cooler (EAC) suitable for IDC. Given the high specific heat capacity of water, the evaporative condensing coil and spray device are added to the evaporative cooler to enhance the heat transfer effect. Heat and mass transfer mathematical models are established to analyze the heat transfer performance. The mathematical model is used to simulate the profile of the heat and ma

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24

Poletaykin, V. F., and G. N. Plesovskikh. "Mathematical models of timber loader motion." Traktory i sel hozmashiny 80, no. 11 (2013): 24–26. http://dx.doi.org/10.17816/0321-4443-65728.

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25

Sitotaw, Natnale. "Energy and Exergy Analysis of Single Effect Water-LiBr Vapour Absorption Refrigeration System." International Journal of Advanced Science Computing and Engineering 4, no. 3 (2022): 175–87. http://dx.doi.org/10.30630/ijasce.4.3.94.

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Vapor absorption refrigeration system (VARS) is one of the emerging technology in thermal-driven refrigeration systems and has too many benefits in comparison with another cooling system as their performance is good and the cost is low. Different mathematical models of various complexities have been developed for performance analysis, optimization, and design of such systems. In this study energy and exergy of a single effect LiBr vapor absorption refrigeration system is analyzed with different mathematical model developed so far. The effect of varying the temperature for each component of the

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Sitotaw, Natnale. "Energy and Exergy Analysis of Single Effect Water-LiBr Vapour Absorption Refrigeration System." International Journal of Advanced Science Computing and Engineering 4, no. 3 (2022): 175–87. http://dx.doi.org/10.62527/ijasce.4.3.94.

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Vapor absorption refrigeration system (VARS) is one of the emerging technology in thermal-driven refrigeration systems and has too many benefits in comparison with another cooling system as their performance is good and the cost is low. Different mathematical models of various complexities have been developed for performance analysis, optimization, and design of such systems. In this study energy and exergy of a single effect LiBr vapor absorption refrigeration system is analyzed with different mathematical model developed so far. The effect of varying the temperature for each component of the

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27

Minaev, V. A., V. M. Pizengolts, A. O. Faddeev, A. Y. Bystryakov, E. V. Savenkova, and E. V. Kruglikova. "Modern information and mathematical models in construction industry." E3S Web of Conferences 116 (2019): 00051. http://dx.doi.org/10.1051/e3sconf/201911600051.

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Building information modelling (BIM) – new technology of construction object information maintenance. It allows specifying influence of changes and risks made in it (including geodynamic) at all stages of lifecycle. Objects include products, building equipment, technological platform, the building, engineering, transportation networks and systems of building communication. The model expands possibilities of innovative technologies implementation, allowing creating reasoned economic decisions.

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Liu, Shi Qiang, and Erhan Kozan. "Integration of mathematical models for ore mining industry." International Journal of Systems Science: Operations & Logistics 6, no. 1 (2017): 55–68. http://dx.doi.org/10.1080/23302674.2017.1344330.

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Kumar, Naresh, and Balraj Singh. "Forecast of Indian Automobile Industry Using Mathematical Models." Paradigm 7, no. 2 (2003): 105–16. http://dx.doi.org/10.1177/0971890720030207.

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Izquierdo, J., R. Pérez, and P. L. Iglesias. "Mathematical models and methods in the water industry." Mathematical and Computer Modelling 39, no. 11-12 (2004): 1353–74. http://dx.doi.org/10.1016/j.mcm.2004.06.012.

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Estrada-Flores, S., D. J. Cleland, A. C. Cleland, and R. W. James. "Simulation of transient behaviour in refrigeration plant pressure vessels: mathematical models and experimental validation." International Journal of Refrigeration 26, no. 2 (2003): 170–79. http://dx.doi.org/10.1016/s0140-7007(02)00081-6.

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Huang, Yanjun, Amir Khajepour, Farshid Bagheri, and Majid Bahrami. "Modelling and optimal energy-saving control of automotive air-conditioning and refrigeration systems." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 231, no. 3 (2016): 291–309. http://dx.doi.org/10.1177/0954407016636978.

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Air-conditioning and refrigeration systems are extensively adopted in homes, industry and vehicles. An important step in achieving a better performance and a higher energy efficiency for air-conditioning and refrigeration systems is a control-based model and a suitable control strategy. As a result, a dynamic model based on the moving-boundary and lumped-parameter method is developed in this paper. Unlike existing models, the proposed model lumps the effects of the fins into two equivalent parameters without adding any complexity and considers the effect produced by the superheated section of

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Liu, Yan Ling, Xue Zeng Shi, and Yuan Yu. "Mathematical Analysis on a Special Adsorption Refrigeration System Suitable for Solar Energy System." Advanced Materials Research 953-954 (June 2014): 119–22. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.119.

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s. In this paper, a new adsorption refrigeration system is designed and calculated. In this system, there are two beds, two condensers and two evaporators. The working principle is explained and specified in this paper. And mathematical models are also set up and through calculation, the system performance is analyzed and evaluated.Theory study results demonstrate that the new system nearly has the same cooling capacity as conventional system and this kind of system can be adopted in actual use.

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Dumitrascu, Gheorghe, Michel Feidt, and Stefan Grigorean. "Closed Irreversible Cycles Analysis Based on Finite Physical Dimensions Thermodynamics." Proceedings 58, no. 1 (2020): 37. http://dx.doi.org/10.3390/wef-06905.

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The paper develops generalizing entropic approaches of irreversible closed cycles. The mathematical models of the irreversible engines (basic, with internal regeneration of the heat, cogeneration units) and of the refrigeration cycles were applied to four possible operating irreversible trigeneration cycles. The models involve the reference entropy, the number of internal irreversibility, the thermal conductance inventory, the proper temperatures of external heat reservoirs unifying the first law of thermodynamics and the linear heat transfer law, the mean log temperature differences, and four

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Al-Hemeri, Dr Shurooq Talib, Dr Mumtaz A. Yousif, and Dr Ahmed M. AL Barifcani. "Optimization of Ethylene Refrigeration System Using Genetic Algorithms Method." Journal of Petroleum Research and Studies 7, no. 1 (2021): 1–37. http://dx.doi.org/10.52716/jprs.v7i1.157.

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Ethylene refrigeration for gases separation at low temperature and high pressure for olefin production is an important technique in the chemical industry. Since small changes in the operating conditions of such a process can have a significant influence on its economics, optimization is desirable. The present work was aimed to propose and establish a mathematical model for the ethylene refrigeration system of the ethylene plant in Basrah petrochemical complex NO.1 (PC1) and reformulated as a geometric programming problem using Visual Basic for predicting:- (overall efficiency of the ethylene r

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Khenien, A., A. Benattayallah, and G. Tabor. "CFD Simulation of an Industrial Spiral Refrigeration System." Energies 12, no. 17 (2019): 3358. http://dx.doi.org/10.3390/en12173358.

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In the food industry, heating and cooling are key processes where CFD can play an important role in improving quality, productivity and reducing energy costs. Cooling products after baking is crucial for storage and transportation; the product has to be cooled efficiently to a specified temperature (often to fulfill regulatory requirements) whilst preserving its quality. This study involves the analysis of spiral cooling refrigerators used in cooling food products, in this case, Cornish Pasties. Three separate sets of CFD models were developed and validated against experimental data taken in t

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Dantas, Tarcísio Soares Siqueira, Ivan Carlos Franco, Ana Maria Frattini Fileti, and Flávio Vasconcelos da Silva. "Nonlinear System Identification of a Refrigeration System." International Journal of Air-Conditioning and Refrigeration 24, no. 04 (2016): 1650024. http://dx.doi.org/10.1142/s2010132516500243.

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Applications of advanced control algorithms are important in the refrigeration field to achieve low-energy costs and accurate set-point tracking. However, the designing and tuning of control systems depend on dynamic mathematical models. Approaches like analytical modeling can be time-consuming because they usually lead to a large number of differential equations with unknown parameters. In this work, the application of system identification with the fast recursive orthogonal least square (FROLS) algorithm is proposed as an alternative to analytical modeling to develop a process dynamic model.

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Zhang, Wenyuan, Zhengrong Shi, and Tao Zhang. "Design of A Mobile Photovoltaic Direct-drive Refrigeration Compartment." Journal of Physics: Conference Series 2503, no. 1 (2023): 012034. http://dx.doi.org/10.1088/1742-6596/2503/1/012034.

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Abstract The large consumption of nonrenewable energy has caused energy shortages and environmental climate problems, and improper food storage has caused a large amount of food waste. To solve the problem of energy shortage and waste in grain transportation, a photovoltaic direct-drive refrigeration compartment based on apple transportation is designed. The design adopts a 15-foot refrigeration compartment and uses lightweight crystalline silicon PV modules to reduce the overall weight of the refrigeration compartment. According to the room size, eight parallel PV modules are selected for pow

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Zhuk, Tetyana. "Mathematical Models of Reinsurance." Mohyla Mathematical Journal 3 (January 29, 2021): 31–37. http://dx.doi.org/10.18523/2617-70803202031-37.

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Insurance provides financial security and protection of the independence of the insured person. Its principles are quite simple: insurance protects investments, life and property. You regularly pay a certain amount of money in exchange for a guarantee that in case of unforeseen circumstances (accident, illness, death, property damage) the insurance company will protect you in the form of financial compensation.Reinsurance, in turn, has a significant impact on ensuring the financial stability of the insurer. Because for each type of insurance there is a possibility of large and very large risks

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LESLIE, F. M., and I. W. STEWART. "Editorial. Mathematical models of liquid crystals." European Journal of Applied Mathematics 8, no. 3 (1997): 251–52. http://dx.doi.org/10.1017/s0956792597003082.

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A symposium held in Durham in July 1995 brought together an international collection of key mathematicians, theoretical physicists and experimentalists in the areas of liquid crystals and polymeric systems. Many of the participants met together for the first time, and the symposium stimulated new collaborative interactions among applied mathematicians and others who, prior to this meeting, were working separately on either liquid crystals or polymer fluids. The symposium also enhanced further interchanges of ideas between industry and academia. The flavour of this meeting is captured by the co

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Ansari, F. A. "Simplified and Accurate Mathematical Model for the Analysis of Heat and Moisture Transfer From Food Commodities." Journal of Heat Transfer 120, no. 2 (1998): 530–33. http://dx.doi.org/10.1115/1.2824285.

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The present paper deals with a simple and accurate mathematical model for making reliable heat and mass transfer analyses from high-water–content solids when exposed to a cold air stream. Such physical situations are encountered in the refrigeration industry during air blast cooling of food commodities. The concept of enthalpy potential has been used to develop a simple linear surface boundary condition equation. This equation accounts for the cooling effect due to sensible convective heat transfer as well as the latent cooling effect due to produce desiccation. Investigations on ten fresh sam

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Semenov, Alexander Evgenyevich, and Aleksander Ivanovich Andreev. "Optimization of operating modes of ship refrigeration plant with artificial cold accumulator." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2023, no. 3 (2023): 65–73. http://dx.doi.org/10.24143/2073-1574-2023-3-65-73.

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The ways of optimizing the operation of a refrigeration unit for fishing and refrigerated vessels with the additional inclusion of artificial cold storage devices are investigated. For this purpose, a new technology of cold storage has been developed on the basis of a refrigerating machine with direct contact between media and ice production. The refrigerant RC318 was taken as freon which does not form crystalline hydrates. Based on this, the optimization of the operation of a single-stage refrigeration machine was carried out using the Lagrange multiplier method for the target function of ene

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Turlakova, S. S., R. B. Reznikov та S. V. Balabanov. "Economіc and Mathematіcal Modelіng of Fіscal Stіmulatіon of the Development of Smart-Іndustry". Herald of the Economic Sciences of Ukraine, № 2(45) (2023): 49–62. http://dx.doi.org/10.37405/10.37405/1729-7206.2023.2(45).49-62.

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Objective: The study focuses on analyzing contemporary economic-mathematical models of fiscal stimulation for the development of smart industry. Primary attention is dedicated to systematizing existing approaches, identifying their shortcomings, and determining potential directions for their improvement. Adapting existing models to the specifics of the national economy of Ukraine, as well as considering the contemporary challenges of globalization and digital transformation, represents a key aspect of the research. Tasks: Several key tasks have been defined within the study. First and foremost

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Kandalova, Marina. "Statistical evaluation of production indicators." E3S Web of Conferences 371 (2023): 05051. http://dx.doi.org/10.1051/e3sconf/202337105051.

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The industry is characterized by a rather complex technological cycle and has many economic entities involved in the implementation of the products of this industry. Under these conditions, the construction of an optimal management system of a food enterprise cannot be carried out without the presence of formed practical analysis models that contribute to the identification of patterns of their functioning. The use of statistical data in it, which allow us to take into account laws and established trends in the development of forecasts for the development of various industries. Mathematical an

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Dandoutiya, Bhrant, and Arvind Kumar. "Comparison of mathematical models to estimate the thermal conductivity of titanium oxide-water based nanofluid: A review." Thermal Science, no. 00 (2021): 224. http://dx.doi.org/10.2298/tsci201026224d.

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Heat transfer is a desirable phenomenon in many industries such as in refrigeration, transportation, power generation, cell preservation, incubator, metallurgy and material processing, health services, etc. Different types of fluids like water, oil, ethylene glycol etc are being used as a heat transfer medium. Water is a commonly used as working fluid for transfer of heat. Nanofluids are developed by adding nano sized particle(s) in existing fluid to improve the heat transfer rate. Thermal conductivity of the nanofluid is an important parameter in estimation of heat transfer rate. Different ty

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OVCHYNNIKOVA, OLENA, and GRAZYNA KACICKA. "TREND MODELS OF FOREST INDUSTRY INDICATORS." MODELING THE DEVELOPMENT OF THE ECONOMIC SYSTEMS 2, no. 2 (2021): 25–32. http://dx.doi.org/10.31891/mdes/2021-2-4.

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The article analyzes the main indicators of the forest industry of Ukraine and Khmelnytsky region. The state of timber harvesting by types of products is shown, it is noted that since 2017 there is no financing of the forest industry by the state, so forestries have to manage independently from their own sources. The paper considers the problem of modeling the indicators of the forest industry of the regions with the help of economic and mathematical methods and models. Trend models have been chosen as a research tool, with the help of which the equations of power, logistic, exponential depend

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Uvaliуeva, I., S. Belginova, and A. smukhamedova. "MATHEMATICAL AND COMPUTER MODELING IN THE PHARMACEUTICAL INDUSTRY." BULLETIN of D. Serikbayev EKTU 2 (June 30, 2023): 248–56. http://dx.doi.org/10.51885/1561-4212_2023_2_248.

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Mathematical and computer modeling is one of the most powerful tools for analyzing and designing various technological processes, including the pharmacological process, which allows you to save resources and prevent many risks in the production of innovative medicines. The use of such models is especially necessary during the transition from the research to the production stage of the release of medicines. This article discusses the techno-logical process of drug production using the example of the drug "Atenolol". On the basis of certain parameters of this drug, a mathematical model is built,

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Di Mattia, Edoardo, Agostino Gambarotta, Mirko Morini, and Costanza Saletti. "Application of modelling approaches of twin-screw compressors: thermodynamic investigation and reduced-order model identification." E3S Web of Conferences 312 (2021): 05001. http://dx.doi.org/10.1051/e3sconf/202131205001.

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Refrigeration is an essential part of the food chain. It is used in all stages of the chain, from industrial food processing to final consumption at home. In these processes, mechanical refrigeration technologies are employed, where compressors increase gas pressure from evaporation to condensation. In industrial refrigeration systems, twin-screw compressors represent the most widely used technology. A detailed mathematical model of a twin-screw compressor has been developed in Simulink® using differential equations for energy and mass balances to simulate the compression cycle that includes s

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Muhammad, Hafiz Ali, Hafiz Muhammad Abdullah, Zabdur Rehman, et al. "Numerical Modeling of Ejector and Development of Improved Methods for the Design of Ejector-Assisted Refrigeration System." Energies 13, no. 21 (2020): 5835. http://dx.doi.org/10.3390/en13215835.

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An ejector is a simple mechanical device that can be integrated with power generation or the refrigeration cycle to enhance their performance. Owing to the complex flow behavior in the ejector, the performance prediction of the ejector is done by numerical simulations. However, to evaluate the performance of an ejector integrated power cycle or refrigeration cycle, the need for simpler and more reliable thermodynamic models to estimate the performance of the ejector persists. This research, therefore, aims at developing a single mathematical correlation that can predict the ejector performance

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Haida, Michal, Rafal Fingas, Wojciech Szwajnoch, et al. "An Object-Oriented R744 Two-Phase Ejector Reduced-Order Model for Dynamic Simulations." Energies 12, no. 7 (2019): 1282. http://dx.doi.org/10.3390/en12071282.

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The object-oriented two-phase ejector hybrid reduced-order model (ROM) was developed for dynamic simulation of the R744 refrigeration system. OpenModelica software was used to evaluate the system’s performance. Moreover, the hybrid ROM results were compared to the results given by the non-dimensional and one-dimensional mathematical approaches of the R744 two-phase ejector. Accuracy of all three ejector models was defined through a validation procedure for the experimental results. Finally, the dynamic simulation of the hybrid ROM ejector model integrated with the R744 refrigeration system was

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