Analysis of Flow and Thermal Phenomena In Evacuated Tube Collectors

The subject of this case study is an issue of optimisation of flat tube solar collectors. Basic elements of energy analysis of performance parameters described by Hottel-Whillier equation are presented in the article. It is considered to be crucial to precisely analyse fluid flow through flow elements in evacuated tube collectors. It is especially important in the case of systems with channels of cross sections shapes different from circular and for the use of detailed mathematical description of complex film conduction phenomena. It is presented that the advanced analysis of the flow and thermal phenomena in complex heat transfer systems, represented by evacuated tube collectors, enables engineering rationalisation of technical solutions for these devices.