scholarly journals Drying the corn in a farm heat pump dryer with fluidized bed

2018 ◽  
Author(s):  
Stanislav Pavlovich Rudobashta ◽  
Galina Albertovna Zueva ◽  
V.M. Dmitriev ◽  
E.A. Muravleva
Keyword(s):  
Analytical Solution ◽  
Fluidized Bed ◽  
Heat Pump ◽  
Zonal Method ◽  
Layer Height ◽  
Kinetic Calculation ◽  
Mass Conductivity ◽  
Kinetic Calculations ◽  
On Farm ◽  
Corn Grain

The possibility of using a heat pump as a part of on-farm drying plant is considered taking drying of corn grain as an example. The methodology for kinetic calculations of a drying plant with a batch fluidized bed for granular materials is developed. These calculations are based on the use of an analytical solution for the problem of mass conductivity  and taking into account the time-related changes in drying agent parameters over the layer height. To determine the concentration dependence of the mass-conductivity coefficient, a zonal method has been used. Keywords: heat pump; dryer; kinetic calculation.

On-farm heat pump - assisted fluidized bed dryer and its kinetics calculation

2019 ◽  
Vol 38 (1-2) ◽  
pp. 6-18
Author(s):  
Stanislaw P. Rudobashta ◽  
Galina A. Zueva
Keyword(s):  
Fluidized Bed ◽  
Heat Pump ◽  
Fluidized Bed Dryer ◽  
On Farm

A Model for a Geothermal Well in a Hydraulic Groundwater Flow for Ground Source Heat Pump Systems

2011 ◽  
Author(s):  
Kevin D. Woods ◽  
Alfonso Ortega
Keyword(s):  
Thermal Conductivity ◽  
Analytical Solution ◽  
Groundwater Flow ◽  
Heat Pump ◽  
Temperature Response ◽  
Ambient Air ◽  
Heat Pumps ◽  
Thermal Reservoir ◽  
Geothermal Well ◽  
Ground Source

Heat pumps are mechanical systems that provide heating to a space in the winter, and cooling in the summer. They are increasingly popular because the same system provides both cooling modes, depending on the direction of the cycle upon which they operate. For proper operation, the heat pump must be connected to a constant temperature thermal reservoir which in traditional systems is the ambient air. In ground source heat pumps however, subterranean ground water is used as the thermal reservoir. To access the subterranean groundwater, “geothermal” wells are drilled into the formation. Water from the building heating or cooling system is circulated through the wells thereby promoting heat exchange between the coolant water and the subterranean formation. The potential for higher efficiency heating and cooling has increased the utilization of ground source heating ventilating and air conditioning systems. In addition, their compatibility with a naturally occurring and stable thermal reservoir has increased their use in the design of sustainable or green buildings and man-made environments. Groundwater flow affects the temperature response of thermal wells due to advection of heat by physical movement of groundwater through the aquifer. Research on this subject is scarce in the geothermal literature. This paper presents the derivation of an analytical solution for thermal dispersion by conduction and advection from hydraulic groundwater flow for a “geothermal” well. This analytical solution is validated against asymptotic analytical solutions. The traditional constant linear heat source solution is dependent on the ground formation thermal properties; the most dominant of which is the thermal conductivity. The results show that as hydraulic groundwater flow increases, the influence of the ground formation thermal conductivity on the temperature response of the well diminishes. The diminishing influence is evident in the Peclet number parameter; a comparison of thermal advection from hydraulic groundwater flow to thermal conduction by molecular diffusion.

scholarly journals MASS CONDUCTIVITY FOR DRYING NUCLEI AND SEED SUNFLOWER SHELLS

2021 ◽  
Vol 64 (5) ◽  
pp. 80-87
Author(s):  
Stanislav P. Rudobashta ◽  
Vadim N. Kochetkov ◽  
Galina A. Zueva ◽  
Vyacheslav M. Dmitriev
Keyword(s):  
Mass Transfer ◽  
Moisture Content ◽  
Internal Heat ◽  
Morphological Structure ◽  
Convective Drying ◽  
Animal Origin ◽  
Seed Kernel ◽  
Zonal Method ◽  
Concentration Dependences ◽  
Mass Conductivity

The mass-conduction (diffusion) properties of sunflower seeds of the "MAS 95 OL" variety were experimentally investigated. From the experimental drying curves obtained in the intradiffusion kinetic mode at two temperatures of the drying agent (air), the coefficients of mass conductivity (moisture diffusion) were calculated by the zonal method, which are presented as dependences on the moisture content of the core and shell, respectively. It is shown that the coefficients of mass conductivity of nuclei and shells depend on the moisture content of the material and differ significantly both in magnitude and in the nature of the concentration dependences. The coefficient of mass conductivity of nuclei in different areas of moisture content is 15-25 times higher than that of shells, this is explained by differences in the structure of these materials. In the area of moisture content less than 0.5 kg / (kg of dry materiall), both dependences have the same character of concave functions increasing with moisture content, this is a consequence of the same mechanism of mass transfer dominating in this area of moisture content, which is osmotic mass transfer. In seed kernels, the area of moisture content of more than 0.5 kg / (kg of dry material) is absent, but in seed shells it is present and vapor diffusion dominates in it. The data on the coefficient of mass conductivity for seed shells were compared with the coefficient of mass conductivity of another capillary-porous colloidal material with a similar structure - wood. The nature of the concentration dependences for both materials is the same, which is explained by the similarity of the morphological structure of wood and seed shells, which have a tree-like structure. The coefficient of mass conductivity of the seed kernel was compared with the coefficients of mass conductivity of other capillary-porous colloidal materials of plant and animal origin. Comparison showed that they have the same order of mass conductivity coefficient: 10-9 m2/s. This is explained by the identical structure of these materials, which have a cellular structure, and, probably, by the same mechanisms of mass transfer at the corresponding moisture content. The obtained data on the coefficients of mass conductivity of the kernel and shell of sunflower seed can be used for the kinetic calculation of the process of convective drying of this material based on the solution of the differential equations of internal heat and mass transfer A.V. Lykov with the representation of the seed as a two-layer body.

scholarly journals Fluidization Characteristics of Moist Food Particles

2006 ◽  
Vol 2 (1) ◽  
Author(s):  
Wijitha Senadeera ◽  
Bandu Wijesinghe ◽  
Gordon Young ◽  
Bhesh Bhandari
Keyword(s):  
Moisture Content ◽  
Linear Model ◽  
Fluidized Bed ◽  
Heat Pump ◽  
Generalized Equation ◽  
Height Variation ◽  
Minimum Fluidization Velocity ◽  
Fluidized Bed Dryer ◽  
Food Particles ◽  
Green Peas

Changes in fluidization behaviour of green peas particulates with change in moisture content during drying were investigated using a fluidized bed dryer. All drying experiments were conducted at 50 + 2 0C and 13 + 2 % RH using a heat pump dehumidifier system. Fluidization experiments were undertaken for the bedheights of 100, 80, 60 and 40 mm and at 10 moisture content levels.Fluidization behaviour was best fitted to the linear model of Umf = A + B m. A generalized model was also formulated using the height variation. Also generalized equation and Ergun equation was used to compare minimum fluidization velocity.

scholarly journals Biosecurity on Poultry Farms from On-Farm Fluidized Bed Combustion and Energy Recovery from Poultry Litter

2010 ◽  
Vol 2 (7) ◽  
pp. 2135-2143 ◽  
Author(s):  
Barry Bowen ◽  
Declan Lynch ◽  
Deirdre Lynch ◽  
Anne Marie Henihan ◽  
James J. Leahy ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Energy Recovery ◽  
Poultry Litter ◽  
Fluidized Bed Combustion ◽  
Poultry Farms ◽  
On Farm
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