Numerical modeling of a flat air solar collector fitted with obstacles

Abstract

The weakness of the solution of flat-air solar collectors in the absence of a turbulence promoter has led researchers to seek other means to improve the performance of the collector. to improve the heat exchange in the air stream from the flat solar collector to the air is the creation of baffles or obstacles to give the longest possible flow path and create a large possible turbulence network. In this article, we studied an air flow around an obstacle field in a flat air solar collector, using the Ansys CFX calculator software, we make a digital 3 D similarity and we give results on the heat exchange in the flat air solar collector and the aim of this study is to show the effect of the obstacles for the fluid flow and the heat transfer in the fluid flow of the flat air solar collector.

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

“…In [18][19], a generalized expression in the form ( 6) is recommended. For spheroids, the following expression is given in [20][21][22][23][24][25]. (22) For disks and plates, expressions of the form ( 6), (23) give significant deviations.…”

“…For spheroids, the following expression is given in [20][21][22][23][24][25]. (22) For disks and plates, expressions of the form ( 6), (23) give significant deviations. Using the interpolation method [5], the following expressions were obtained:…”

CFD analysis for absorber tube of a solar water heater collector

“…This manuscript is one of the first steps to address the shortcomings identified in the above works. Different materials were evaluated in the first step to make the most cost-effective SWH collectors, while at different water inlet velocities [15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Determination of the heat losses of insolation passive solar heating systems

“…In the conditions of our Republic, the relevance of using solar energy in heat supply systems as a source of low-grade heat is due to the fact that at present, out of all the heat energy generated in 2000 (46.4 million Gcal), 50,4% was spent for low-temperature needs of the population ( 33.6%) and household sector (16.8%) [1][2][3][4][5][6].…”

“…There are passive solar heating systems that are based on the principles of operation of both passive and isolated systems. In this case, the solar thermal collector is placed on the southern vertical wall, and the thermal accumulator is combined with the blocking of the flow and at the same time acts as a radiator of a panel-radiant heating system [3][4][5].…”