Increasing energy efficiency combined device solar dryer-water heater with heat accumulator

Abstract

In the article, the authors proposed a combined device of a solar dryer-water heater with a heat accumulator (CDSDWHHA) for drying agricultural products using solar energy. As a research object - a connected device of a solar dryer-water heater with a heat accumulator, a drying drum installation, and an additional combined solar water-air heating collector for simultaneous heating of water and air was installed. Drying agricultural products is a technological process that requires a large consumption of thermal energy and fuel-energy resources. The results of the conducted analysis showed that electric heating devices are often used to operate such a system, which are always expensive and not economically acceptable. In this paper, in order to reduce the traditional energy consumption for drying agricultural products, a combined device of solar dryer-water heater with heat accumulator is proposed and experiments were conducted in the meteorological climate of Karshi city. As a result of experimental studies shows the heat load compensation and energy efficiency of the solar water-air heating collector drying device with a heat accumulator in the “water + air” heating mode. The installation efficiency was found to be in the range of 0.66 - 0.72.

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).…”

“…For spherical bodies, equations ( 7) and ( 8) give fairly accurate results [2,5]. For flat disks (d>>h) and plates (h<d<<l), equations ( 7) and ( 8) give significant deviations, since these equations are for bodies of isometric shape (d≈h≈l).…”

A technology for teaching ESP to those studying ecology and environmental sustainability

“…Therefore, even in higher education, students should be taught to create an ecological culture, develop new educational technologies, implement new methods of teaching, determine the right attitude towards nature, and instill a love for the environment. Achieving purity is considered an important stage in solving environmental problems [4][5][6][7][8][9]. Ecological education is an educational process aimed at providing students with theoretical ecological knowledge in a consistent, systematic, and continuous manner.…”

“…Waters, and P. Stevens are good examples of pioneers who conducted research in this field, as Hutchinson and Waters noted: "English is now the wants, needs and remained subject to the requirements. people other than language teachers" [5][6][7][8][9][10][11]. Students have different language learning methods for teaching environmental concepts and building environmental knowledge because they are all unique and have different needs.…”