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All Journal International Journal of Electrical and Computer Engineering Makara Journal of Technology Journal of Engineering and Technological Sciences Prosiding SNTTM
Nandy Putra
Laboratorium Perpindahan Kalor, Fakultas Teknik, Universitas Indonesia, Depok 16424, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Prosiding SNTTM

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Optimalisasi pendinginan pasif dengan dual evaporator loop heat pipes: studi visualisasi dengan radiografi neutron Fathoni, Andhy M.; Hendrayanto, Priska A.; Ramadhan, Ranggi S.; Putra, Nandy
Prosiding SNTTM Vol 22 No 1 (2024): SNTTM XXII Oktober 2024
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/590646

Abstract

In this study, a dual evaporator loop heat pipe (DE-LHP) was developed to accommodate multiple heat sources from a single electronic device. Loop heat pipe (LHP) operation involves complex hydrody-namic phenomena, especially in scenarios involving numerous vapor-liquid interfaces. The complexity of LHPs depends on various elements, such as device design, orientation to gravity, selection of work-ing fluids, heat loads, and condenser cooling conditions. The accuracy of virtual representations in cap-turing the actual hydrodynamic behavior of a working LHP needs to be improved, hampering the de-velopment of precise modeling and design methodologies. This study on thermal performance alone needs to provide a comprehensive picture. Therefore, using visualization is important because research on visualization of working fluid behavior in two phases still needs to be completed. Therefore, neu-tron radiography is used in this experiment to observe the boiling and fluid dynamics in the heat pipe because it has advantages over other visualization methods. Copper material is used to develop the DE-LHP. The capillary wick used is made of stainless steel screen mesh. Deionized water with a 50% filling ratio is selected as the working fluid. To understand the flow behavior phenomenon under steady-state conditions, the heat load varies in a constant temperature range of 40-120oC. Three cartridge heaters simulate multiple heat sources and are controlled using a PID controller. The results show that the pro-posed DE-LHP can function well, accommodate multiple heat sources, and maintain stable performance over a wide range of constant temperatures. Neutron radiography images reveal essential details about the working fluid distribution during operation. The photos also show interesting findings, such as steam pulses and entrained working fluid in the vapor chamber and channels.
Thermal performance enhancement in electric motor rotors: Evaluating the impact of rotating heat pipes Rezqi, Khairu; Putra, Nandy; Sholahudin, Sholahudin; Kiswanto, Gandjar
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/hdn06j82

Abstract

Effective thermal management is essential in high-performance electric motors, where rotor overheating accelerates demagnetization and reduces operational lifespan. This study investigates a horizontally mounted, wick based rotating heat pipe (RHP) as a passive cooling solution for an induction motor rotor. The system was subjected to stepped heat loads 20, 25, 30, and 35 W, also and speeds 0, 250, 500, 750 RPM, with time resolved measurements acquired to evaluate steady state thermal resistance (Rth) and transient response. The results reveal a non monotonic relationship between rotational speed and thermal performance. Contrary to initial assumptions, the RHP achieved its lowest Rth of 0.164 °C/W not at standstill, but at a moderate speed of 250 RPM. This performance peak is attributed to a balanced interplay where gentle centrifugal force enhances capillary-driven liquid distribution, maximizing effective evaporation without inducing flow instability. Compared to the solid rotor baseline, the RHP consistently reduced rotor temperatures by up to 6 °C and lowered thermal resistance by more than 70%. Additionally, the RHP halved the thermal time constant following each power step, indicating superior transient regulation. The identification of an optimal rotational speed window, distinct from any transitional instability zone, offers critical design insight for embedding RHPs in next-generation electric machines where spatial constraints and thermal reliability are paramount.
Co-Authors Abral, Hairul Adi Winarta, Adi Agus Pamitran, Agus Ardian Roekettino Ardian Roekettino, Ardian Ary Maulana Bambang Suryawan, Bambang Bayu Trianto Bayu Trianto, Bayu Dewantara, Annastya Bagas Erwin Prawiro, Erwin Fathoni, Andhy M Fathoni, Andhy M. Fitri Wahyuni Gerry Julian Hakim, Imansyah Ibnu Hendrayanto, Priska A. Hendri D.S. Budiono James Julian Kartika D, I Made Luh Putu Ratna Sundari Mohammad Adhitya, Mohammad Muhamad Asvial Muhammad Amin Putra, Gerardo Janitra Puriadi RA. Koestoer Ramadhan, Ranggi S. Rezqi, Khairu Ridho Irwansyah Sholahudin, Sholahudin Siregar, Yasmine Karenita Wayan Nata Septiadi Wibowo, Cahyo Setyo