Microprocessors and Microsystems 83 (2021) 104033 Available online 16 January 2021 0141-9331/© 2021 Published by Elsevier B.V. An experimental inquisition of waste heat recovery in electronic component system using concentric tube heat pipe heat exchanger with different working fuids under gravity assistance P. Ramkumar a, * , M. Sivasubramanian b , P. Raveendiran c , P. Rajesh Kanna d a Department of Mechanical Engineering, Kalasalingam Academy of Research and Education, Krishnankoil, Virudhunagar, 626126, Tamil Nadu, India b Department of Automobile Engineering, Kalasalingam Academy of Research and Education, Krishnankoil, Virudhunagar, 626126, Tamil Nadu, India c Department of Mechanical Engineering, Alagappa Chettiar Government College of Engineering and Technology, Alagappa University, Karaikudi, 630003, Tamil Nadu, India d Department of Mechanical Engineering, Al Ghurair University, Dubai, 37374, United Arab Emirates A R T I C L E INFO Keywords: Heat pipe Heat exchanger Inclination angle Working fuid Electronic component Effectiveness ABSTRACT In the utilizing of the waste heat in the electronic components meets the power demand and energy utilization for the industries and domestic applications. To meet out this by the understanding and optimization of the waste heat utilization by a compact and cost effective device using heat pipe heat exchanger. This paper states with the design, fabrication, development, and observation of an experimental investigation of the heat pipe introduce in the concentric tube heat exchanger. Working fuids like Methanol, Acetone and heat transport fuid as water. The investigation is further extended by varying the inclination angles, mass fow rates, and temperatures of hot and cold fuid at inlet conditions. The infuence of gravitational effect on the heat pipe heat exchanger is conducted for inclination angle from 10 ◦ to 80 ◦ and the maximum performance is obtained at 60 ◦ inclination angle. It is observed while acetone as working fuid there is an increase in 29.75% for effectiveness, 79.81% as heat transfer coeffcient, 39.53% as heat transfer rate, 6.70% for Reynold’s number and 10.52% decrease in thermal resistance than with methanol. It is concluded that the acetone exhibits better performance when related with methanol as a working fuid. These observations show the suitability of the designed concentric tube heat pipe heat exchanger for the utilization of waste heat dissipation in electronic component system. 1. Introduction Heat pipes are employed in electronic component cooling, automo- tive system, solar energy collectors / storage system, heat exchangers and dehumidifers for effective heat exchanging applications. The de- mand for heat transfer enhancement in waste heat recovery for elec- tronic component applications has been improved with the infuence of heat pipe as better thermal management approach. It is possible to in- crease the heat transfer by 10 to 40% while using heat pipe in heat exchanger for the applications. This leads to the design of a suitable heat exchanging device on waste heat recovery applications in a compact and effcient way using heat pipe with heat exchanger. The heat pipes are employed in electronic cooling, solar collectors, heat exchangers and dehumidifers for effective heat exchanging. Conventionally available heat pipes are using acetone, methanol and deionized water as working fuid and very few used nanofuid. The recovery of heat released in laboratories and hospitals were investigated using methanol and heat pipes in three rows, increased the effciency and effectiveness reported by Baghban and majideian [1]. Vasiliev [2] made a study on heat-pipe with heat exchangers. The heat-pipes were effective heat exchanging equipment employed as thermal links in various systems to ensure en- ergy saving and to safeguard the environment. Yang et al. [3] investi- gated on heat pipe with heat exchanger for analysing an exhaust gas in automobiles. Giovanni et al. [4] studied the analysis on the heat pipe heat exchanger, consisting of 54 horizontal copper tubes of 700 mm length with aluminium fns of 0.115 mm thickness and with 3 mm fn spacing. The analysis was made using hydrofuorocarbon as a refrigerant (HFC 134a) and compared their results with new global warming po- tential hydro fuoro-olefn [HFO 1234 Ze (E)]. The experimentation concluded that refrigerant HFO 1234-Ze(E), the performance of the heat exchanger was equivalent to the traditional HFC 134a refrigerant. Wang ; Abbreviations: HTF, Heat Transport Fluid; LMTD, Log Mean Temperature Difference; LPH, litre per Hour; LPM, litre per Minute; WF, Working Fluid. * Corresponding author. E-mail addresses: rkmailmech@gmail.com, ram@makeittech.in (P. Ramkumar). Contents lists available at ScienceDirect Microprocessors and Microsystems journal homepage: www.elsevier.com/locate/micpro https://doi.org/10.1016/j.micpro.2021.104033 Received 23 November 2020; Received in revised form 4 January 2021; Accepted 14 January 2021