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All Journal TEKNIK Eduvest - Journal of Universal Studies
Moh. Djaeni
Universitas Diponegoro
Aerospace Engineering Computer Science & IT Engineering Health Professions Neuroscience Social Sciences

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Performance Evaluation and Evaporation Loss Prediction in Counter Flowinduced Draft Geothermal Wet Cooling Tower Type Through Computational Fluid Dynamics (CFD) Simulation Mukhamad Nashir; Moh. Djaeni; Muchammad Muchammad
Eduvest - Journal of Universal Studies Vol. 6 No. 1 (2026): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v6i1.52564

Abstract

Cooling towers are critical components in geothermal power generation systems, playing a vital role in maintaining thermal efficiency and managing water resources. This study investigates the thermal performance and water loss due to evaporation in an induced draft counter-flow cooling tower using a modeling and simulation approach based on Computational Fluid Dynamics (CFD). Validation of the simulation results against actual data demonstrated high accuracy, with an error margin of 1.8%, indicating that CFD is a reliable method for analyzing and optimizing cooling tower design Simulation results show that increasing the hot water inlet temperature from 35°C to 49°C leads to a rise in evaporation loss from 5.0 kg/s to 13.0 kg/s (CFD), while the ASHRAE method yields higher values, ranging from 5.5 kg/s to 14.5 kg/s. For variations in hot water mass flow rate (423–845 kg/s), the ASHRAE method exhibits a linear increase in evaporation loss, whereas CFD results remain relatively stable. Additionally, increasing the hot water mass flow rate causes the cold-water outlet temperature to decrease from 21°C to 11°C, accompanied by a reduction in system effectiveness from 92% to 86%. Furthermore, increasing the cold air inlet velocity from 3.5 m/s to 6.5 m/s raises the evaporation loss from 14.5 kg/s to 16.0 kg/s (CFD) and significantly enhances system effectiveness from 11% to 91%. Overall, the findings demonstrate that CFD simulations provide realistic performance estimations compared to empirical methods, particularly under dynamic operating conditions.
The Role of Algae in Biofuel Production: Potentials and Challenges for Sustainable Transportation Dessy Agustina Sari; Moh. Djaeni; Hadiyanto Hadiyanto; Aji Prasetyaningrum
TEKNIK Vol 46, No 1 (2025)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i1.67532

Abstract

This study aims to explore the potential of algae for sustainable biofuel production by examining their molecular biology and the use of advanced cultivation techniques. As concerns over greenhouse gas emissions and rising transportation energy costs grow, algae offer a promising alternative for fuel derived from both food and non-food sources. This review looks at the main biological pathways involved in making biofuels from algae. It focuses on species diversity, lipid content, and new technologies like photobioreactors and magnetic nanoparticle harvesting. The results showcase noteworthy advancements in biotechnology and genetic engineering that boost algae productivity and fuel yield, while also critically examining the environmental impacts such as CO2 emissions and water use, as well as the economic and policy challenges through a life cycle analysis. Adopting a global perspective, this review emphasizes the role of international collaboration and technology transfer in overcoming barriers. Conclusion: Algae-based biofuels hold considerable potential for reducing CO2 and supporting sustainable transportation, yet scaling up production and lowering costs remain challenges. Future research should focus on improving integrated biorefinery platforms, exploring CO2 capture, and promoting international partnerships.
Co-Authors Aji Prasetyaningrum Dessy Agustina Sari H Hadiyanto Muchammad Muchammad Mukhamad Nashir