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All Journal Jurnal Sosial dan Teknologi Makara Journal of Technology Prosiding SNTTM
Arnas Lubis
Universitas Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering

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Thermodynamic Analysis of Irreversible Heat-transformers Giannetti, Niccolo`; Arnas, Arnas; Rocchetti, Andrea; Saito, Kiyoshi
Makara Journal of Technology Vol. 19, No. 2
Publisher : UI Scholars Hub

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Abstract

Absorption heat transformers extend the possibilities for efficient and environment-friendly energy conversion processes. Based on a general thermodynamic model of three-thermal cycles with finite thermal capacity of the heat sources, this paper is intent upon analyzing and optimizing the performance of absorption heat transformers, by including the influence of irreversibility in the analytical expression of the system efficiency. Dimensionless parameters for an overall optimization are defined and a first screening is performed to clarify their influence. Dependence on the main factors is highlighted to suggest how to change them in order to enhance the whole system performance. Under this point of view, the analysis evaluates coefficient of performance (COP) improvements and can be used to perform existing plant diagnostics, besides predicting the system performance. The use of this criterion is exemplified for specific heat transformers data from literature. This approach identifies the limitations imposed to the physical processes by accounting for the inevitable dissipation due to their constrained duration and intensity, and constitutes a general thermodynamic criterion for the optimization of three-thermal irreversible systems.
Thermoeconomic Optimization of Cascade Refrigeration System Using Mixed Carbon Dioxide and Hydrocarbons at Low Temperature Circuit Nasruddin, Nasruddin; Arnas, Arnas; Faqih, Ahmad; Giannetti, Niccolo
Makara Journal of Technology Vol. 20, No. 3
Publisher : UI Scholars Hub

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Abstract

Many applications and industrial processes require very low cooling temperature, such as cold storage in the biomedical field, requiring temperature below -80 °C. However, single-cycle refrigeration systems can only achieve the effective cooling temperature of -40 °C and, also, the performance of the cycle will decrease drastically for cooling temperatures lower than -35°C. Currently, most of cascade refrigeration systems use refrigerants that have ozone depletion potential (ODP) and global warming potential (GWP), therefore, in this study, a cascade system is simulated using a mixture of environmentally friendly refrigerants, namely, carbon dioxide and a hydrocarbon (propane, ethane or ethylene) as the refrigerant of the low temperature circuit. A thermodynamic analysis is performed to determine the optimal composition of the mixture of carbon dioxide and hydrocarbons in the scope of certain operating parameters. In addition, an economic analysis was also performed to determine the annual cost to be incurred from the cascade refrigeration system. The multi-objective/thermoeconomic optimization points out optimal operating parameter values of the system, to addressing both exergy efficiency and its relation to the costs to be incurred.
Pengaruh Desain Inlet Outlet terhadap Distribusi Partikel di Ruang Pencampuran Industri Farmasi : Studi CFD Adiriwanto Sutiono, Devin; Lubis, Arnas
Jurnal Sosial Teknologi Vol. 4 No. 7 (2024): Jurnal Sosial dan Teknologi
Publisher : CV. Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jurnalsostech.v4i7.1299

Abstract

Di industri farmasi, dispersi partikel yang buruk dapat membahayakan kualitas produk, proses manufaktur. Dispersi partikel yang buruk dapat mengganggu proses berikutnya, seperti filtrasi, pengeringan, dan pemerasan tablet. Dispersi partikel sangat dipengaruhi oleh aliran udara. Penempatan saluran masuk dan keluar dapat menentukan pola aliran udara di ruang bersih. Pemakaian purifier juga dapat mengurangi jumlah partikel di dalam ruangan. Tujuan penelitian ini untuk melakukan simulasi CFD untuk menampilkan distribusi partikel, jumlah partikel yang dapat dibersihkan.  Model yang digunakan untuk simulasi adalah single side down, top supply down return. Penambahan purifier mobile di dua lokasi berbeda akan ditinjau penulis untuk mengetahui apakah purifier memberikan dampak signifikan di dalam membersihkan partikel. Supply yang berada di langit langit dapat menyebabkan distribusi partikel yang tidak merata. Sedangkan supply dari sisi samping memberikan turbulensi yang lebih seimbang, sehingga sebaran partikel lebih seragam. Letak purifier yang jauh dari outlet lebih besar dalam mengeluarkan partikel ketimbang letak purifier yang dekat. Dimana untuk model single side down terdapat selisih 61.256.696 partikel. Untuk model top down return terdapat selisih 22.893.261 partikel. Model yang paling banyak mengeluarkan partikel adalah single side dengan purifier jauh yaitu 255.247.925 partikel. Dapat membersihkan sekitar 78,17% dari jumlah partikel di ruangan. Hasil simulasi CFD menunjukkan bahwa desain inlet dan outlet memainkan peran penting dalam menciptakan pola aliran yang optimal dan distribusi partikel yang seragam di dalam ruang pencampuran. Variasi pada jumlah, posisi, dan orientasi inlet serta outlet terbukti mempengaruhi secara signifikan karakteristik aliran dan dispersi partikel.
Sistem pendingin gedung 15.5 MWh dengan ice slurry CTES dan solar PV Agus Sunjarianto Pamitran; Rizqi Rizaldi Azis; Eko Mulyono; Ardiyansyah Yatim; Arnas Lubis
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/jq6wjj06

Abstract

Given the increasing concerns about the environmental impact of fossil fuel-based electricity sources, effective efforts are needed to encourage the use of green energy to meet electricity needs, especially for buildings. Air conditioning systems generally contribute the largest electricity consumption in commercial buildings, so planning an energy conservation system is very important. This study designs a building air conditioning system that uses solar power plants (PLTS) as a power source, by applying the principles of district cooling and cold thermal energy storage (CTS) with ice slurry to optimize the performance of the cooling system. With a case study in a building in Jakarta, Indonesia, this study aims to determine the capacity of the PV system and CTES that can reduce energy consumption and emissions, while considering the costs involved. This study shows 3 CTES charging schemes. In this study, a comparison of several CTES charging schemes shows that the charging scheme using a hybrid power supply is the most cost-efficient option, followed by the off-grid scheme, while the conventional system is the most expensive due to the high cost of electricity. Overall, the CTES system with ice slurry is not only a technological innovation, but also a strategic step towards a more environmentally friendly and energy-efficient building system, where energy needs are balanced with the principle of long-term sustainability.
Co-Authors Adiriwanto Sutiono, Devin Agus Sunjarianto Pamitran Ahmad Faqih Andrea Rocchetti, Andrea Ardiyansyah Yatim Eko Mulyono Giannetti, Niccolo Kiyoshi Saito, Kiyoshi Nasruddin Nasruddin Niccolo` Giannetti, Niccolo` Rizqi Rizaldi Azis