Thermal conditions of systems for solar thermal regeneration of adsorbents

Abstract

Energy supply of fruit and vegetable storages, especially in those remote from the centralized energy supply using solar energy, is relevant. The authors of the article propose a system of thermal regeneration of adsorbents based on the use of solar energy. The paper presents studies of heat transfer and thermal regime of the developed system of solar-thermal regeneration of the adsorbent (activated carbon) in non-stationary mode. The results of the study of heat transfer and thermal regime of systems for solar-thermal regeneration of adsorbents (activated carbon) under unsteady conditions are presented. A mathematical model of the temperature field of the adsorbent layer during solar heating using a solar air collector is proposed. The proposed mathematical model of the thermal regime of the solar adsorption installation allows you to qualitatively control the technological process of thermal regeneration of adsorbents and significantly reduce the cost of traditional energy resources.

Analysis of thermophysical parameters of solar water desalination plant with an external camera

“…The dimensions of the main camera are width-1 m, depth-1 m, height-0.9 m. The section where salt water is poured consists of width-1 m, depth-1 m, height-0.1 m. A separate section connected to the main chamber is a chimney and its height is 2 m. The 3D geometry of the two-chamber solar water heater was created in COMSOL Multiphysics software, and Figure 1 shows the schematic model of the designed 3D model. Establishing accurate boundary conditions and their types played a crucial role in achieving precise solutions for fluid flow problems [16][17][18][19][20][21][22]. While certain boundary conditions were determined based on physical phenomena, others were set using the simulation software COMSOL Multiphysics.…”

Simulation of hydrodynamics of the dispersed layer of fruit during solar-convective drying

“…There are many equations for calculating the pressure drop in random packages of spherical and lumpy (irregularly shaped) granular bodies [2][3][4][5][6][7][8][9][10][11]. In foreign and domestic practice, the Ergan equation (internal problem) is most often used at 0.1<Re<10 4 according to equation ( 2 At low Reynolds numbers (laminar mode Re<2*103), equation ( 4) turns into equation (5).…”

Modeling and optimization of the parameters of the heat accumulator of the combined livestock-heliogreenhouse complex

“…Where, w ttemperature of water in water tank accumulators, ºC; air tthe temperature of the air moving through the space between the batteries, ºC; air Nuis the Nusselt number in the turbulent regime for a cross-sectional set of air flow washing water tank accumulators and can be found using the following expression: through which the air moves (aw.t./deq.) and the Reynolds number for the air flow, it is selected according to [13] Taking into account the expressions (3), ( 4), ( 5), (6), calculate the coefficient of heat transfer by heated (cooling) air to the water tank accumulator set (in charging mode) and the coefficient of heat transfer to the air accumulated in the water tank accumulator (in discharge mode) we can write as follows [15]:…”

“…By building a livestock building and a solar greenhouse side by side, the heat load of the solar greenhouse is compensated by three sources, namely, ventilation between them, solar radiation passing through the transparent surface of the greenhouse, and burning biogas obtained from livestock waste in the boiler unit and heating water. On sunny days, excess heat is transferred to the greenhouse through a water tank installed on the wall between the livestock building and the solar greenhouse, and a certain part of the heat is accumulated in the water [10][11][12][13][14][15][16].…”