Simulation of Heat Transfer in Solar Air Heaters with a Concave Blower Absorber

This article provides a general description of a new type of energy efficient tubular solar air heater operating on the basis of solar energy, including from renewable energy sources, which is considered relevant today. Also, in the working chamber of the solar air heater, the optimal variant of concave air ducts was used, which has the property of accelerating the heat exchange process, a mathematical model was created and solved using numerical methods. As a result of the study, the longitudinal distribution of heat and the flow rate were studied.

The article is aimed at determining the operating parameters of the device, as well as solving the problems of finding the optimal speed when entering the pipe. In the working chamber of the device, an analysis of air movement and the appearance of a vortex inside concave pipes were carried out.

When developing a mathematical model of the longitudinal distribution of heat and velocity in each air pipe of this concave tubular solar air heater, the Reynolds-averaged Navier Stokes equations (English RANS (Reynolds–averaged Navier-Stokes)) were used. The Spalart Allmares turbulence model was used to close the RANS equation. To solve the Reynolds and Spalart Allmares differential equations for convective terms, the scheme against the flow of A A Samarisky was used, and for the diffusion term, the scheme of central separations was used. For the difference approximation of the initial equations, the control volume method was used, and the relationship between velocities and pressure was found using the SIMPLE (SemiImplicit Method for Pressure Linked Equations) procedure.