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All Journal Angkasa: Jurnal Ilmiah Bidang Teknologi Compiler KACANEGARA Jurnal Pengabdian pada Masyarakat

Bahrul Jalaali

Sekolah Tinggi Teknologi Adisutjipto

Author-ID : 3750990

Computer Science & IT Education

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Articles

The Alternative Binary Geothermal Power-Plant Design to Utilize the Waste Heat in Lahendong Plant Eli Kumolosari; Bahrul Jalaali; Kutut Suryopratomo; Okto Dinaryanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 2 (2020): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

The first geothermal binary system in Indonesia that has successfully implemented is a 500kW binary system in Lahendong. Yet, there is still a plenty room of improvement for binary system development in Lahendong. This study aims to give an alternative design of the binary system by using an organic Rankine cycle. The investigations of thermodynamic analysis based on the law of thermodynamics, silica scaling analysis, and optimization of working fluid selection are presented. Flashing process from separator produces vapor and liquid-brine with mass flow rates 48.6 kg/s and 173.6 kg/s at separator pressure of 10.23 bar. Based on second law thermodynamics analysis, obtained the maximum useful energy from brine flow is 7.2MW. Based on the simulation results, it is achieved that the potential power generated by waste heat from the Lahendong plant is 2.46MW with the net thermal and exergy efficiency by 11% and 34%, respectively. Compared to the current operating binary system, still, much available energy needs to be harnessed in the future from the Lahendong plant.

THE NAVIER-STOKES-CONTINUITY EQUATION SOLVER BASED ON ARTIFICIAL COMPRESSIBILITY METHOD Bahrul Jalaali
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 1 (2020): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Fluid dynamics analysis can be accurately approximated by using a computer-based numerical method. Rely on the mass and momentum governing equation, the mathematics model for the compressible condition is numerically difficult to overcome. Through an artificial compressibility method, the quasi-compressible condition solution can be simplified. This study will investigate the classical lid-driven cavity case model to affirm the artificial compressibility method. The result shows that the current model is in-line with the previous study for the lid-driven cavity case. A conventional benchmark with the previous numerical study is shown as well.

IMPLEMENTASI VISI SUSTAINABLE DEVELOPMENT GOALS(SDGs) PADA PROGRAM BERBASIS MASYARAKAT DI ERA PANDEMI Bahrul Jalaali
KACANEGARA Jurnal Pengabdian pada Masyarakat Vol 4, No 1 (2021): Januari
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/kacanegara.v4i1.711

The COVID-19 pandemic situation is directly affecting both the health and economic sectors, especially in Indonesia. The synergy between university, community, and practitioner is needed as an effort for COVID-19 prevention and to help driving the economical sector in terms of the community service program. Sustainable development goals (SDGs) are the global actions that will be referred to as the community service program. The indicator analysis between global action and the outcomes of the community service program is performed to give further the recommendation related to the globally oriented program on solving a local problem. As a scheme of university tri dharma, SGDs based community service program has been implemented to the COVID-19 affected region, namely, a small business of convection in Wedi, Klaten, and health equipment distribution towards Wonosari hospital (RSUD). Program is evaluated in terms of ethical, social and economical dimension, yet the result intepretation is presented as well. The results of these activities have achieved the collaboration of community service activities with the mission of the SDGs on the implementation of the economy, health, and partnership sectors.

LATTICE BOLTZMANN PSEUDO-POTENTIAL MODELLING OF MULTIPHASE DROPLET PHENOMENA Thomas Ken Darmastono; Bahrul Jalaali
Compiler Vol 9, No 2 (2020): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

The multiphase modeling of a droplet in a multiphase system is considered becoming a fundamental problem in fluid dynamics. A complex understanding of droplet behavior is critical to reveal a deeper insight into a more complex multiphase system. Droplet behavior studies are necessary to obtain a better understanding of solving multiphase problems in both the science and industrial aspect. The droplet behavior is characterized by a non-dimensional number such as the Eötvös number. In this study, numerical simulation was performed using the Lattice Boltzmann method. Parametric studies of Eötvös number was done. The parametric study of the Eo number is obtained using LBM. Based on the results obtained, it is concluded that the gravitational force influences the downwards rate of the droplet. Furthermore, the shape of the droplet during falling was depended on the Eo number as well. The higher Eo number means higher gravitational force, hence the velocity of the droplet is increasing as well as the reaction force of surface tension. This study is beneficial to give a deeper explanation of multiphase phenomena as well as contribute to the modeling of multiphase phenomena using an alternative numerical method of LBM.

Co-Authors Eli Kumolosari Kutut Suryopratomo Okto Dinaryanto Thomas Ken Darmastono

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