Analysis of Temperature and Humidity Field in a New Bulk Tobacco Curing Barn Based on CFD

Bai, Zhipeng; Guo, Duoduo; Li, Shoucang; Hu, Yaohua

doi:10.3390/s17020279

Cited by 12 publications

(5 citation statements)

References 19 publications

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“…In recent years, CFD simulation studies on tobacco drying have increased and yielded many beneficial results. CFD models have been built based on porous, heat transfer, and turbulence models from which to study the temperature and humidity fields in the drying chamber [14][15][16][17]. The simulation results are consistent with the experimental data and are used to study energy saving, design optimization and improve the quality of the drying process.…”

Section: Introductionmentioning

confidence: 80%

Influences of Loading Density of Tobacco Drying Chamber on Drying Quality

Chuong¹,

Nam²,

Huong³

et al. 2022

IJHT

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Drying is one of the most important steps in tobacco processing because it determines the color, taste, and micronutrients in tobacco. The loading density and the arrangement of tobacco leaves in the drying chamber affect the temperature and humidity distribution of the air, thereby affecting the drying quality. In this paper, three drying cases with different tobacco weights were studied by computational fluid dynamics (CFD) simulation as well as experimental. The results show that when the loading density of the tobacco drying chamber increases, the local resistance of tobacco leaves increases sharply, and the velocity difference and temperature difference of the air in the tobacco drying chamber increases. The maximum temperature difference in the highest loading density reaches 10 K. The uneven temperature distribution of the air reduces the quality of the dried tobacco.

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Section: Introductionmentioning

confidence: 80%

Influences of Loading Density of Tobacco Drying Chamber on Drying Quality

Chuong¹,

Nam²,

Huong³

et al. 2022

IJHT

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show abstract

“…Bao et al [10] conducted numerical studies on temperature, humidity and velocity fields in the tobacco baking room. To reduce this dependency and achieve high quality the curing process, Bai et al [11] proposed a new structure of the tobacco bulk baking room based on the heat pump and conducted numerical simulation with CFD to conduct the temperature and humidity of the baking room. Portia et al [12] proposed a biomass fired flue curing tobacco barn design for small-medium scale farmers in Zimbabwe with a clear objective to control the temperature and humidity.…”

Section: Introductionmentioning

confidence: 99%

Design and Temperature Modeling Simulation of the Full Closed Hot Air Circulation Tobacco Bulk Curing Barn

2022

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For now, the open humidification method is applied in the tobacco bulk curing barn, which has some disadvantages, such as the loss of the oil content and aroma components of the tobacco leaves and the waste heat loss of the exhaust air flow. In this context, a tobacco bulk curing barn with totally closed hot air circulation is designed to perfect the curing quality of tobacco and avoid the loss of residual heat in the bulk curing barn. Meanwhile, due to the balance and symmetry of input and output of the curing barn temperature, according to the law of conservation of energy, a mathematical model of the temperature control system of the closed hot air circulation tobacco bulk curing barn is established, and the temperature transfer function of the system is obtained. On this basis, 10 algorithms are used to optimize the full closed hot air circulation tobacco bulk curing barn temperature control system PID parameters. The result of the sobol sequence seeker optimization algorithm (SSOA) is better than the other algorithms. So, the PID control strategy based on the SSOA is used to simulate and experiment the temperature control system of tobacco bulk curing barn. The simulation and experimental results show that for the tobacco bulk curing barn temperature control system, the sobol sequence seeker optimization algorithm PID control has better dynamic characteristics compared with fuzzy PID control, and the temperature control system of tobacco bulk curing barn has fast adjustment and small overshoot. Therefore, the new baking barn with proper PID parameters can improve the tobacco’s curing quality and save energy by reducing the residual heat.

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“…[4][5][6], and their abnormal values can be life-threatening [7]. Besides, environmental temperature and humidity are the key elements to affect production efficiency and product quality in many industrial activities such as manufacturing, processing and production of biological product [8,9], food [10,11], tobacco [12,13] and so on. These prove that the values of them are closely related to our life.…”

Section: Introductionmentioning

confidence: 99%

A direct nonlinear humidity and temperature tracking controller for an air-handling unit based on backstepping scheme

Sun

Liu

Li³

et al. 2022

Preprint

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Aim at an air-handling unit (AHU), this article describes a direct design scheme for humidity and temperature tracking control. The nonlinear dynamic model of the AHU is treated directly by backstepping strategy, which can reserve the modeling qualifications and make better use of known information than proportion integration differentiation (PID) and other non-model-based schemes. Simultaneously, the linearization technique is not adopted, so that the model structure is not changed, which can retain the original system model restrictions to variables and does not lose useful conditions about the system model. These two points ensure the developed controller to achieve higher accuracy and better tracking performance, which is verified by stability analysis and comparisons of simulation results.

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Analysis of Temperature and Humidity Field in a New Bulk Tobacco Curing Barn Based on CFD

Cited by 12 publications

References 19 publications

Influences of Loading Density of Tobacco Drying Chamber on Drying Quality

Influences of Loading Density of Tobacco Drying Chamber on Drying Quality

Design and Temperature Modeling Simulation of the Full Closed Hot Air Circulation Tobacco Bulk Curing Barn

A direct nonlinear humidity and temperature tracking controller for an air-handling unit based on backstepping scheme

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