Mathematical Model of Heat and Mass Exchange in Bundle of Textile Material Where Moisture Permeability is Present

2019 ◽  
Vol 51 (2) ◽  
pp. 147-152
Author(s):  
N. M. Sharpar ◽  
Z. N. Osmanov
Keyword(s):  
Mathematical Model ◽  
Mass Exchange ◽  
Textile Material ◽  
Heat And Mass Exchange ◽  
Moisture Permeability

scholarly journals Modeling of greenhouse radiant heating

2018 ◽  
Vol 193 ◽  
pp. 03006 ◽  
Author(s):  
Mikhail Pavlov ◽  
Sergey Lukin ◽  
Oleg Derevianko
Keyword(s):  
Mathematical Model ◽  
Air Temperature ◽  
Mass Exchange ◽  
Thermal Power ◽  
Equation System ◽  
Radiant Heating ◽  
Heat And Mass Exchange ◽  
Heating Systems ◽  
Exchange Processes ◽  
The Impact

Commercially available greenhouses are commonly used for provision of year-round growing of agricultural crops at protected ground. In order to provide favorable conditions for plants growth these agricultural constructions should be equipped by artificial heating systems in cold sea-sons. This work presents an overview of basic traditional and alternative heating systems which find their applications in agriculture. Advantages of application of roof radiant heating with infrared radiation sources for green-houses are discussed. It was discovered that now there is no appropriate mathematical model of greenhouse radiant heating, which takes into account both heat and mass exchange processes. Here we propose a mathematical model of radiant heating, which includes equation system of both heat and mass exchange processes for greenhouse, its enclosure and soil. The numer-ical calculations were performed for commercially available greenhouse “Farmer 7.5”. We investigated the impact of external air temperature and heat exchange rate on the following greenhouse radiant heating characteris-tics: internal air temperature, heating system thermal power and water dis-charge for soil watering.

scholarly journals TIME-VARIANT MODEL OF HEAT-AND-MASS EXCHANGE FOR STEAM HUMIDIFIER

2020 ◽  
Vol 10 (2) ◽  
pp. 24-27
Author(s):  
Igor Golinko ◽  
Volodymyr Drevetskiy
Keyword(s):  
Mathematical Model ◽  
Control Systems ◽  
Mass Exchange ◽  
Dynamical Model ◽  
Heat And Mass Exchange ◽  
Automatic Control Systems ◽  
Exhaust Ventilation ◽  
Industrial Complexes ◽  
Dynamical Properties ◽  
Lumped Parameters

The dynamical model of heat-mass exchange for a steam humidifier with lumped parameters, which can be used for synthesis of control systems by inflowing-exhaust ventilation installations, or industrial complexes of artificial microclimate, is considered. A mathematical description that represents the dynamical properties of a steam humidifier concerning the main channels of control and perturbation is presented. Numerical simulation of transient processes for the VEZA KCKP-20 humidification chamber to the influence channels was carried out. The achieved dynamical model of a humidification chamber can be the basis for the synthesis of automatic control systems and simulation of transient states. A significant advantage of the obtained mathematical model in the state space is the possibility of synthesis and analysis of a multidimensional control system.

Aspects of Mathematical Modelling of Heat and Mass Exchange at Burning of Droplet of Water Fuel Oil Emulsion

2013 ◽  
Vol 371 ◽  
pp. 642-646 ◽  
Author(s):  
Ştefania Roxana Buzdugă ◽  
Tudor Sajin
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Mathematical Modelling ◽  
Mass Exchange ◽  
Fuel Oil ◽  
Gas Cell ◽  
Heat And Mass Exchange ◽  
Conservation Of Energy ◽  
Oil Emulsion ◽  
Thermo Physical Properties

This paper presents some aspects regarding modelling of heat and mass exchange at burning of droplet of water-oil emulsion (WOE). Based on nonstationary differential equations of conservation of energy and matter in the liquid and gaseous phases, it was formulated a physical and mathematical model of heat and mass exchange in system of WOE drop-elementary gas cell. Unlike other models, in this model is taken into account the dependence of thermo physical properties of phase by temperature. The heating, micro explosion, vaporization and combustion stages of droplet burning were considered. For numerical solution and computer simulation of mathematical model has been developed an algorithm in Mathcad14 software. The numerical results were validated experimentally.

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