scholarly journals Simulation of drying process of secondary products of fish cutting and description of the main processes of heat and moisture transfer in the model

Author(s):  
O. P. Dvoryaninova ◽  
A. V. Sokolov

The effectiveness of drying is largely determined by the ability to quickly manage this process and maintain the regime parameters at a given level. At the heart of any control system is a mathematical description of the process. The paper discusses the process of drying secondary products of fish cutting, as an object of possible modeling and mathematical description of complex physical phenomena of heat and mass transfer. To simulate the processes of heat and moisture transfer, a method based on the generally accepted equations of heat and moisture transfer A.V. Lykova is used. For the convenience of modeling and repeated computer experiments, the computer program "Program for modeling the drying of fish products with additional microwave heating" in the language of Object Pascal in the integrated programming environment Borland Delphi 7 was developed. The program is designed to simulate the drying process of fish products by solving the problem of heat - and moisture transfer on a cubic grid, taking into account the combined heating technology (convective and microwave heating). The program can be used to optimize the drying modes and parameters of the microwave source. In the text of the program, the thermophysical parameters can be given to solve the problem of heat and moisture transfer, the geometric parameters and structure of the fish parts, the parameters of the microwave source. In the process of computer experiment on drying products from fish, the program regularly displays on the computer screen the graphs and cartograms of the spatial distribution of humidity and temperature. The main technical characteristics of the program: the number of grid nodes for solving the problem of heat and moisture transfer: 50 x 50 x 40; the approximate time of one computer experiment is about 5 minutes.

2015 ◽  
Vol 33 (9) ◽  
pp. 1124-1137 ◽  
Author(s):  
Perapong Tekasakul ◽  
Racha Dejchanchaiwong ◽  
Yuttana Tirawanichakul ◽  
Supawan Tirawanichakul

2001 ◽  
Vol 6 (1) ◽  
pp. 9-19 ◽  
Author(s):  
A. Buikis ◽  
J. Cepitis ◽  
H. Kalis ◽  
A. Reinfelds ◽  
A. Ancitis ◽  
...  

The mathematical model of wood drying based on detailed transport phenomena considering both heat and moisture transfer have been offered in article. The adjustment of this model to the drying process of papermaking is carried out for the range of moisture content corresponding to the period of drying in which vapour movement and bound water diffusion in the web are possible. By averaging as the desired models are obtained sequence of the initial value problems for systems of two nonlinear first order ordinary differential equations. 


Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4180
Author(s):  
Joowook Kim ◽  
Michael Brandemuehl

Several building energy simulation programs have been developed to evaluate the indoor conditions and energy performance of buildings. As a fundamental component of heating, ventilating, and air conditioning loads, each building energy modeling tool calculates the heat and moisture exchange among the outdoor environment, building envelope, and indoor environments. This paper presents a simplified heat and moisture transfer model of the building envelope, and case studies for building performance obtained by different heat and moisture transfer models are conducted to investigate the contribution of the proposed steady-state moisture flux (SSMF) method. For the analysis, three representative humid locations in the United States are considered: Miami, Atlanta, and Chicago. The results show that the SSMF model effectively complements the latent heat transfer calculation in conduction transfer function (CTF) and effective moisture penetration depth (EMPD) models during the cooling season. In addition, it is found that the ceiling part of a building largely constitutes the latent heat generated by the SSMF model.


Author(s):  
Dinghua Xu ◽  
Peng Cui

AbstractThe thickness, thermal conductivity and porosity of textile material are three key factors which determine the heat-moisture comfort level of the human body to a large extent based on the heat and moisture transfer process in the human body-clothing-environment system. This paper puts forward an Inverse Problem of Textile Thickness-Heat conductivity-Porosity Determination (IPT(THP)D) based on the steady-state model of heat and moisture transfer and the heat-moisture comfort indexes. Adopting the idea of the weighted least-squares method, we formulate IPT(THP)D into a function minimization problem. We employ the Particle Swarm Optimization (PSO) method to stochastically search the optimal solution of the objective function. We put the optimal solution into the corresponding direct problem to verify the effectiveness of the proposed numerical algorithms and the validity of the IPT(THP)D.


Sign in / Sign up

Export Citation Format

Share Document