This paper presents the study of fluid flow and heat transfer in solar flat plate collector by using Computational Fluid Dynamics (CFD) which reduces time and cost. In the present paper the computational fluid dynamics (CFD) tool has been used to simulate the solar collector for better understanding the heat transfer capability. 3D model of the collector involving air inlet, the collector is modeled by ANSYS Workbench and the grid was created in ANSYS ICEM. The results were obtained by using ANSYS FLUENT and ANSYS CFX. The objective of this work is to compare theoretically and experimentally work done with the work done by using computational fluid dynamics (CFD) tool with respect to flow and temperature distribution inside the solar collector. The outlet temperature of air is compared with experimental results and there is a good agreement in between them.
The study of flow around obstacles is devised into three different positions: above the obstacle, upstream of the obstacle, and downstream of the latter. The behaviour of the fluid downstream of the obstacle is less known, and the physical and numerical modelling is being given the existence of recirculation zones with their complex behaviour. The purpose of the work presented below is to study the influence of the inclined form of the two upper peaks of a rectangular cube. A three-dimensional study was carried out using the ANSYS CFX calculation code. Turbulence models have been used to study the flow characteristics around the inclined obstacle. The time-averaged results of contours of velocity vectors <V>, cross-stream <v> and stream wise velocity <u> and streamlines were obtained by using K-ω shear -stress transport (SST), RANG K-ε and K-ε to model the turbulence, and the governing equations were solved using the finite volume method. The turbulence model K-ω SST has presented the best prediction of the flow characteristics for the obstacle among the investigated turbulence models in this work.
Saving energy and protecting the environment are the cornerstones of the modern concept of energy consumption. Following the Algerian program on renewable energies and energy consumption, dictated by Algeria's new energy transition policy, 40% of electricity production should come from renewable energies by the year 2030. The present article accompanies this policy and makes an attempt to improve the energy efficiency. This work presents a comparative experimental study of two models of flat plate air solar collectors, namely a solar collector with black mini solar concentrators (BMSC) and another model, similar to the first one, with the same geometry and dimensions, and supplied with mini solar concentrators and mirrors (MSCMR) instead of black mini solar concentrators. A comparison of the temperature profiles for these two models of solar collectors is performed in this work, in the two cases of free convection and forced convection. Comments on this innovative design are presented and the results obtained are found encouraging.
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