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Investigation of Natural Circulation Flow Under Steady-State Conditions Using a Rectangular Loop Roswandi, Iwan; Dimas, Dimas; Gunawan, Hyundianto Arif; Budiman, Arif Adtyas; Amelia, Almira Citra; Sanda, Sanda; Tjahjono, Hendro; Juarsa, Mulya
JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA Vol 26, No 2 (2024): June 2024
Publisher : Pusat Teknologi Dan Keselamatan Reaktor Nuklir (PTKRN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/tdm.2024.7055

Abstract

Passive safety systems have garnered significant attention, particularly in situations where active systems fail. The comprehension of natural circulation phenomena plays a vital role in the advancement of passive cooling systems in nuclear power plants. The objective of this study is to examine the flow patterns under steady state conditions and assess the Grashof number. The experimental approach involved maintaining temperature differences of 60°C, 70°C, 80°C, and 90°C for a duration of 3 hours, with 3 replications. Alterations in temperature have an impact on the physical properties of water, such as density, viscosity, and specific heat. The calculations indicate that the minimum Grashof number occurs at 60°C (2.49×1012), while the maximum is observed at 90°C (9.42×1012), with an R2 value of 0.96533. Turbulent flow patterns were observed during each temperature fluctuation, which aligns with previous research on the Ress value of Grm/NG.
Menafsir Baby Grave di Kalimbuang Bori’ Toraja: Memahami Ruang, Budaya dan Perubahan di Era Modernitas Hasrin, Sri Wahyuni; Muhammad, Zakiyudaulah; Alwiyah, Tri Nur; Kurniawan, L. M. Rezky; Sanda, Sanda; Silsiyana, Jusnita; Ridwan, Serly Novita; Fatwa, Fatwa; Salsabila, Kalsum Azizah; Allobunga', Immanuel
DISCOURSE: Indonesian Journal of Social Studies and Education Vol. 2 No. 2 (2025): March
Publisher : Citra Media Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69875/djosse.v2i2.190

Abstract

The infant burial tradition in Kalimbuang Bori’, Toraja, is an integral part of the local culture that is rich in symbolism, reflecting the community's beliefs about the cycle of life and death. This study aims to answer three main questions: first, the meaning and role of baby graves in the formation of social and spiritual values of the Kalimbuang Bori' community; second, the location selection and spatial interaction of the baby grave tradition with the natural environment that influences the community's culture; and third, the role of the younger generation of Toraja in preserving this tradition amidst the influence of modernization. Primary data collection methods were carried out through interviews, questionnaires, documentation, and direct observation in the field, while secondary data were obtained from scientific journal articles, map databases, and other research papers. The analysis method used is descriptive qualitative, which allows researchers to explore the meaning of this tradition in depth. This study adopts the Environmental Determinism Theory to explain how culture is shaped by the natural environment. The results show that the baby grave tradition reflects deep social and spiritual values and shows a close relationship between humans and nature. The role of the younger generation is very important in preserving this tradition so that cultural values remain alive amidst the challenges of modernization, and it is hoped that this research can provide deeper insight into the interaction between space and culture in the context of infant burials in Toraja.
Implementation of adaptive PID control for maintaining temperature stability during steady-state conditions in stirred heating tank Valentina, Pricylia; Tjahjono, Hendro; Pamitran, Agus Sunjarianto; Roswandi, Iwan; Setiawan, Putut Hery; Budiman, Arif Adtyas; Haryanto, Dedy; Sanda, Sanda; Prayogo, Kukuh; Juarsa, Mulya
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 4: December 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i4.pp2389-2399

Abstract

Temperature stability is a crucial factor in industries such as chemicals, pharmaceuticals, and food processing, where fluctuations can damage product quality and increase energy consumption. This study aims to optimize heater power control using an adaptive proportional integral derivative (PID) control system to maintain temperature stability under steady-state conditions. The method involves applying adaptive PID control to a stirred heating tank using LabVIEW software with a national instruments controller module and a single-phase SCR to regulate heater power and adjust control parameters in real time. The results indicate that the system operates more effectively under stable conditions, with faster response times and a lower overshoot of less than 0.12%. However, under disturbed conditions, such as water drainage and replacement, the system requires more time to adjust the temperature and experiences increased energy consumption and heat loss. Despite this, the system still achieves an energy efficiency improvement, with efficiency values ranging from 77.66% to 80.03%. The implementation of adaptive PID control demonstrates significant potential in enhancing system accuracy and response to temperature changes, contributing to the development of more efficient industrial control technologies.