The boiler efficiency is improved with the help of economizer it is one of the main accessory part in the boiler. Boiler feed water is preheated with the entry of reused flue gas through economizer. This present work is planned to analyze the overall heat flux and overall heat transfer in the boiler economizer. Higher amount of flue gases passing around the economizer to preheat the feed water at the same time much more heat is transferred. The heat transfer is analyzed by statistical method with influence of different process parameters. Economizer fin dimensions are major consideration to taken for this analysis and estimate the overall heat flux and overall heat transfer. The process parameters of this study are named as thickness of the fin (3.5 mm, 4 mm, 4.5 mm and 5 mm), Height of the fin (4 mm, 5 mm, 6 mm and 7 mm), Fin gap (12 mm, 14 mm, 16 mm and 18 mm and Tube diameter (44 mm, 46 mm, 48 mm and 50 mm). The response values are finding as overall heat flux and overall heat transfer.
Heat pipe-type evacuated tube solar collector (HP-ETSC) is one of the most efficient solar thermal collectors used to harness solar energy as it prevents various thermal losses. A heat pipe uses a working fluid in it so that, it transfers heat to water in heat exchangers. The Use of nanofluids (nanoparticle suspensions) instead of the normal working fluid in HP-ETSC is the current focus of research. Nanofluids help in increasing thermal conductivity, hence the efficiency of the ETSC heat pipes increases by great magnitudes. The main objectives of this investigation are to evaluate the performance of a thermosyphon-ETSC and to study the effect of using hybrid nanofluids of different concentration on the performance of the thermosyphon-ETSC. Three different percentages of titanium dioxide (TiO 2 ) + copper oxide (CuO) hybrid nanofluid were used and the composition were 0.5, 1, 1.5% v/v. The results of the experimental investigation are presented in this paper.
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