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All Journal Journal of Appropriate Technology for Community Services Equilibrium Journal of Chemical Engineering Journal of Applied Sciences, Management and Engineering Technology (JASMET)
Sawitri, Dyah Retno
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Energy Analysis of the Refrigeration System and Its Impact on Process Parameter in Shortening Oil Production Hartanto, Hartanto; Sawitri, Dyah Retno; Mamun, Sholeh
Journal of Applied Sciences, Management and Engineering Technology Vol 6, No 1 (2025)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2025.v6i1.7035

Abstract

The food industry continuously evolves to meet the increasing demand for high-quality products such as shortening oil. This study analyzes the performance of refrigeration systems in shortening oil production, focusing on the effects of suction pressure on energy efficiency and product quality. Experimental results demonstrate that increasing the suction pressure from 1,2 bar to 1,6 bar leads to a reduction in cooling capacity (Qe) from 110,08 kJ/kg to 91,36 kJ/kg, heat rejection capacity (Qc) from 137,34 kJ/kg to 122,85 kJ/kg, and the Coefficient of Performance (COP) from 4,04 to 2,90. Despite these declines in system efficiency, the penetration value (Pen.V) of the final product increased from 272 mm/s to 314,4 mm/s, indicating an improvement in the texture of the shortening oil. These findings underscore the critical role of optimizing suction pressure and operational parameters to balance energy efficiency and product quality. The study highlights the importance of maintaining precise control over refrigeration system variables to enhance production sustainability and meet industry standards.
Penerapan Teknologi Pembuatan Produk dari Limbah Tutup Botol Bekas Hidayat, Arif; Sawitri, Dyah Retno; A'yuni, Deriza Qurrotun; Safitri, Indah; Ida, Yusticia Eka Noor
Journal of Appropriate Technology for Community Services Vol. 7 No. 1 (2026)
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jattec.vol7.iss1.art5

Abstract

Masalah penumpukan limbah plastik, khususnya tutup botol, menjadi tantangan serius di Tempat Pengelolaan Sampah (TPS) 3R Girimulya. Limbah jenis ini memiliki nilai ekonomis rendah dan sulit diurai, namun memiliki potensi sebagai bahan baku alternatif dalam pembuatan papan daur ulang. Kegiatan pengabdian ini bertujuan untuk merancang dan mengimplementasikan alat cetak tekan panas sederhana berbasis panas dan tekanan yang dapat digunakan masyarakat setempat untuk mengolah tutup botol plastik menjadi papan. Metode yang digunakan meliputi studi lapangan, perancangan teknis, pembuatan prototipe, uji coba alat, serta pelatihan penggunaan kepada masyarakat TPS 3R. Hasilnya menunjukkan bahwa alat yang dikembangkan mampu memproduksi papan plastik daur ulang dengan kekuatan struktural memadai untuk keperluan kerajinan atau pelapis dinding. Partisipasi masyarakat dalam kegiatan ini juga menunjukkan peningkatan kesadaran akan potensi ekonomi dari limbah plastik. Upaya untuk meningkatkan efisiensi pengelolaan dan harga jual dari sampah plastik khususnya tutup botol plastik di TPS 3R Girimulya. Melalui penerapan alat cetak tekan panas yang dirancang khusus. Program ini melibatkan perancangan, proses produksi, sosialisasi, dan uji coba alat oleh para Pegawai TPS 3R Girimulya. Meskipun keluhan terkait waktu pembuatan produk yang lama, namun secara keseluruhan program ini dinilai berhasil dan memberikan dampak positif terutama dalam meningkatkan nilai jual plastik daur ulang dan mendukug pengelolaan sampah yang berkelanjutan.
Density Evaluation of Alkyl Ester from Different Types of Alcohol and Vegetable Oil Sawitri, Dyah Retno; Azzam, Khusnul; Isnani, Ani Chalwa; Husein, Darryl Al
Equilibrium Journal of Chemical Engineering Vol 9, No 2 (2025): Volume 9, No 2 December 2025
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v9i2.107798

Abstract

ABSTRACT. Alkyl ester, also known as biodiesel, is an alternative renewable energy source and is produced through the reaction of vegetable oil and alcohol. One of the important characteristics of biodiesel lies in the density value. This study evaluates the density value of alkyl esters from several raw materials. The raw materials used include palm oil and rice bran oil. In comparison, the types of alcohol used include methanol, ethanol, and isopropanol. The density values of palm oil ethyl ester and rice bran oil ethyl ester were measured at 30 – 100°C. The density measurement results were then compared with the simulation results using ASPEN Plus® software. The density of alkyl esters was measured over a temperature range of 30-100°C. The density measurements were then compared with the simulation results using ASPEN Plus® software. The measurement and simulation results showed that the density was higher in the order ethyl > methyl > isopropyl ester for palm oil. When viewed from the vegetable oil, the density of rice bran oil ethyl ester is higher than that of palm oil ethyl ester. The results of measuring biodiesel from rice bran oil and palm oil at 40°C show that only the isopropyl ester has a density that does not meet the quality requirements of biodiesel as defined by the Indonesian National Standard. Keywords:Biodiesel, Density, Palm oil, Rice bran oil 
Co-Authors A'yuni, Deriza Qurrotun Arif Hidayat Azzam, Khusnul hartanto hartanto Husein, Darryl Al Ida, Yusticia Eka Noor Isnani, Ani Chalwa Mamun, Sholeh Safitri, Indah