Abstract
For the flow through type selected geometry of the designed evacuated tube collector ETC, a three dimensional simulation and analysis of the thermal performance was done, using the ray-tracing solar load model provided by the ANSYS-FLUENT software. In this model the solar radiation heat flux is solved using fair weather condition radiation equations, and then solar radiation load is considered as a heat source term in the energy equation. The thermal effects of the fluid flow and heat transfer in the collector, temperature fields as well as the solar radiation distribution, and other related factors under the different conditions have been discussed and analyzed.
Highlights
The ordinary flat plate collectors are not practical for elevated temperature ranges due to their high heat loss coefficient
The evacuated tube collectors (ETCs) can be achieved using selective coatings of the absorber, because with no coated absorber, radiation losses would dominate at high temperatures, and eliminating convection alone would not be very effective[1]
Heating of surfaces due to radiation can be achieved in Computational Fluid-Dynamics (CFD) model using Discrete Transfer Radiation Model, or P-1 Radiation Model, or Rosseland Radiation Model, or Surface-to-Surface (S2S) Radiation Model, or Discrete Ordinates (DO) Radiation Model
Summary
The ordinary flat plate collectors are not practical for elevated temperature ranges due to their high heat loss coefficient. ANSYS-FLUENT commercial software is providing five radiation simulation models, which allow inclusion of radiation, with or without a participating medium, in the heat transfer simulations. The objective of this work is to develop a CFD numerical model that provides useful information to analyze the solar evacuated tube collector behavior, and to obtain the behavior of the developed ETS collector without performing the set of complicated and expensive experimental tests
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