Int. J. Thermal-Fluid Engineering and Modern Energetics 1 (2022) 2-18 www.tfeme-ba.com doi: 10.51558/2831-0527.2022.1.1.2 2 Article Energy Efficiency of the Novel Adaptive In-Line Process Electric Heaters Fikret Alic Faculty of Mechanical Engineering Tuzla, Department of Thermal and Fluid Technique, Bosnia and Herzegovina Correspondence: fikret.alic@untz.ba A R T I C L E I N F O A B S T R A C T Article history: Available online 1 July 2022 The novel segment electric in-line process electric heaters heater designed to heat various fluids analyzed in this work. The complete electric heater consists of several hollow cylindrical segment heating elements. The segment heating elements can vary positioned in relation to the fluid flow. The total power of the segment process heater is equal to the sum of the power of all heating segments and is 0.756kW. Volumetric air flow variations in the amount of 0.001m 3 s -1 , 0.002m 3 s -1 and 0.003m 3 s -1 . The heating elements are positioned in the three combinations in relation to the direction of the fluid flow. The comparative numeric analysis, conducted for this work, has the goal to determine the influence of the arrangement of segment heaters on the overall energy efficiency of the segment electric heater. In order to verify the results of the numeric simulations carried out and experimental investigations of the segment electric heater. Keywords: In-line heater Energy efficiency Segment elements Fluid flow, Convective heating 1. Introduction For convective heating of the compressible and incompressible fluids used a large number of process heaters. Most process heaters are the heat generated by conversion from electrical energy. Convectively heating of the air or gas can carry at normal atmospherically pressure or under high pressure. The heating of the compressible fluid under atmospherically pressure includes a channel within which installed the electric heater. The heating of the compressed fluid additional includes a compression system and using electric process heaters. Fluid flows through the convection heating surface, while the forced convection this fluid is heated with different intensities. The wide field through the application of these process heaters, so heat used to clean, dry air orgasm for baking, drying, laminating, metalworking, packaging, plastic welding, preheating, sealing, soldering, etc. Many technical factors influence the efficiency of the process of electric heaters, i.e. the electricity used to heat the fluid. The fluid velocity, the temperature of the convective surfaces, and the geometric architecture of the channel for the passage of the fluid are significantly affected by the process heating efficiency. One of the frequently used electric heaters of this type is the band heater, with efficient and economical heating of the outer surface to the pipe through which fluid flows. These heaters can produce with ceramic housing if they want to achieve a high temperature. The main heating element is Ni-Cr wire, which is built within the wall of the heater. Many studies and researchers have focused on maximizing the efficiency of the convective heating fluid, with or without phase change fluid. K.J.Brown et al. [1] investigated radiant energy efficiency of infrared heating elements. The results indicate that the radiant efficiencies are strongly dependent on the input power to the element and depend on the distance from the heater. Bahadori A and Vuthaluru HB [2] studied simple-to-use correlations to design the radiant and convective sections of direct-fired heaters. A simple correlation presented to predict the gross thermal efficiency as a function of percent excess air and stack gas temperature. C.Hemmer, G.Polidori, and C.Popa, [3] noted an industrial application concerning the