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All Journal Equilibrium Journal of Chemical Engineering Jurnal Sains dan Teknologi
Sabrianah Badaruddin
Universitas Pattimura
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Veterinary

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Performance Analysis of a 1-1 Shell-and-Tube Intercooler for Compressed Air Cooling Systems Farida Diyah Hapsari; Hana Nikma Ulya; Esther Mutiara Santallum Ekklesia Tibalia; Sabrianah Badaruddin; Alif Nur Laili Rachmah
Equilibrium Journal of Chemical Engineering Vol 10, No 1 (2026): Volume 10, No 1 July 2026 (First Online)
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v10i1.116048

Abstract

This study presents an evaluation of a 1-1 shell-and-tube heat exchanger (Intercooler-2) utilized in a multi-stage air compressor. The evaluation was conducted using plant operational data and classical heat exchanger analysis methods, including heat balance, overall heat transfer coefficient under clean (Uc) and operating (Ud) conditions, dirt factor (Rd) and pressure drop (ΔP). The calculation results show a heat transfer rate of 557,640.622 Btu/h with a true temperature difference of 113.774 °F, indicating an adequate thermal driving force. The flow on the shell side is in the turbulent regime (Re ≈ 79,952), while the tube side shows laminar flow (Re ≈ 829), which limits the optimization of convective heat transfer of water as a cooling medium. The overall heat transfer coefficient under clean conditions of 25.627 Btu/h.ft².°F decreased to 23.125 Btu/h.ft².°F due to a fouling factor (Rd) of 0.004. The pressure drop values on both sides are still well below the permitted limits, so the unit is declared operationally feasible. However, the presence of fouling and laminar flow regime on the tube side indicates the potential for performance improvement thru optimization of water flow rate and periodic cleaning. This study emphasizes the importance of periodic performance evaluation to maintain the efficiency and reliability of heat exchanger operations in air compression systems.
Pengaruh Substitusi Abu Bonggol Jagung sebagai Pozzolan pada Semen Portland Komposit terhadap Kuat Tekan Mortar Alif Nur Laili Rachmah; Binti Ruliana; Sabrianah Badaruddin; Ratih C F Ratumanan; Ronald Darlly Hukubun
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 4 (2025): Agustus 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i4.6142

Abstract

The effect of additive corn cob ash (CA) on Portland Composite Cement (PCC) on the compressive strength of the mortar is influenced by pozzolan. The material that makes up pozzolan is silica. Corn cobs are agricultural waste that contains silica and every year continue to increase, so corn cob waste is as an additional material to Portland Composite Cement (PCC). This study was conducted to determine the compressive strength value of mortar using additive corn cob ash (CA) and corn cob ash that has been washed with HCl 2N (CA*) and the feasibility of these additives as a PCC-type cement mixture. The weight percentages of additives used were 5%, 10%, and 15%, and the duration of the mortar compressive strength test was 3, 7, and 28 days. The experimental results showed that the compressive strength (σm) was highest at the addition of 5% additives, the effect of additives on compressive strength resulted in σm research > standard σm (SNI). The results of the activation index analysis obtained additive corn cob ash of 76% and corn cob ash+HCl 2N of 76.71%, the value is above the minimum limit according to ASTM C.618-99 which is 75%.
Proses Ekstraksi Antioksidan dari Daun Kalanchoe pinnata: Studi Pengaruh Ukuran Partikel dan Kinetika Maserasi Sabrianah Badaruddin; Alif Nur Laili Rachmah; Ratih C F Ratumanan; Ronald Darlly Hukubun; Tamaratritania Citta Trisnantari
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 4 (2025): Agustus 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i4.6183

Abstract

Kalanchoe pinnata leaves are rich in bioactive compounds, including flavonoids and phenolic constituents, which exhibit notable antioxidant properties. However, the efficiency of extraction processes is highly influenced by operational variables such as the type of physical pre-treatment and maceration duration. This study aims to evaluate the effect of three physical pre-treatment methods (manual grinding, chopping, and blending) and maceration periods ranging from 3 to 5 days on the antioxidant activity of K. pinnata leaf extracts using the DPPH radical scavenging assay. Results indicate that the grinding method combined with five days of maceration yields the highest antioxidant activity (95.04%), while blending leads to the lowest activity (81.78%), presumably due to heat-induced degradation of active compounds. Kinetic observations show that antioxidant activity tends to plateau on day five, particularly in ground samples. These findings highlight the critical influence of particle size reduction and solvent–solid contact time on mass transfer efficiency during extraction. This preliminary investigation provides a scientific basis for further research on the optimization of natural antioxidant extraction processes and the development of functional herbal formulations derived from K. pinnata leaves.
Co-Authors Alif Nur Laili Rachmah Binti Ruliana Esther Mutiara Santallum Ekklesia Tibalia Farida Diyah Hapsari Hana Nikma Ulya Ratih C F Ratumanan Ronald Darlly Hukubun Tamaratritania Citta Trisnantari