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All Journal Rotasi METANA Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik agriTECH Jurnal Pengabdian Vokasi Journal of Vocational Studies on Applied Research
Sri Utami Handayani
Departemen Teknologi Industri, Sekolah Vokasi, Universitas Diponegoro
Agriculture, Biological Sciences & Forestry Computer Science & IT Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mechanical Engineering

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KARAKTERISTIK POMPA SENTRIFUGAL ALIRAN CAMPUR DENGAN VARIABLE FREQUENCY DRIVE Handayani, Sri Utami
ROTASI Vol 15, No 3 (2013): VOLUME 15, NOMOR 3, JULI 2013
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (485.026 KB) | DOI: 10.14710/rotasi.15.3.30-34

Abstract

In an industry that uses large centrifugal pumps continuously, pump speed setting can reduce energy consumption significantly. By changing the speed of a centrifugal pump,  capacity, head, and pump power required will change according to pump affinity laws. Speed of a centrifugal pump can be changed  by variable frequency drive . This study aimed to investigate the characteristics of mixed flow centrifugal pumps with variable frequency drive. The results showed that 10% of maximum speed reduction can decrease power consumtion until 50%, while the increase in the efficiency is maximum 7.2%. The power reduction is different for different speed reduction. In a dynamic head dominated system the efficiency will remain constant during speed reduction while in static head dominated system will change.
Pengaruh Kondisi Operasi Ekstraksi Reaktif Gelombang Mikro Untuk Produksi Biodisel Dari Biji Kemiri Sunan Secara In Situ Yulianto, Mohamad Endy; Firyanto, Rudi; Mulyaningsih, M.F. Sri; Handayani, Sri Utami; Amalia, Rizka
METANA Vol 12, No 2 (2016): Desember 2016
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1123.31 KB) | DOI: 10.14710/metana.v12i2.9749

Abstract

Krisis energi berbasis bahan bakar fosil  telah menjadi masalah global karena ketersediaannya sangat terbatas. Berbagai upaya telah dilakukan untuk mencari bahan bakar alternatif yang memiliki sifat dapat diperbaharui dan ramah lingkungan, diantaranya dengan penggunaan biofuel biodisel. Tujuan riset adalah mempelajari pengaruh variable proses ekstraksi reaktif gelombang mikro untuk produksi biodisel dari biji kemiri sunan. Kebaruan dan inovasi utama dari skema proses yang dikembangkan adalah pengambilan minyak kemiri sunan dan reaksi transesterifikasi terjadi pada satu tahap. Pengukuran data dilakukan di Laboratorium Bioenergi Teknik Kimia Sekolah Vokasi UNDIP dan Laboratorium Teknik Separasi Teknik Kimia UNTAG dan selama 4 bulan. Kegiatan yang dilaksanakan antara lain: (i) desain dan pabrikasi alat ekstraktor reaktif gelombang mikro kapasitas 5 liter/hari, dan (ii) studi pengaruh variabel proses ekstraksi reaktif untuk produksi biodisel. Variabel proses dalam ekstraksi dan metanolisis minyak kemiri sunan sebagai upaya dalam meningkatkan produktifitas dibagi menjadi dua, yaitu: variabel tetap dan variabel berubah. Penelitian telah dilaksanakan dengan berat biji kemiri sunan sebesar 250 gr dan dan dihaluskan. Variabel berubah menggunakan parameter suhu ekstraksi reaktif 50, 55, 60, dan 65 oC, dan perbandingan umpan metanol:biji kemiri sunan pada rasio 5:1, 4:1, 3:1, dan 2:1. Hasil kajian menunjukkan bahwa alat ekstraktor reaktif gelombang mikro untuk produksi biodisel dari biji kemeri sunan telah dipabrikasi secara baik. Semakin besar rasio metanol-biji kemiri sunan, konversi minyak kemiri sunan menjadi metil ester semakin meningkat. Peningkatan  perolehan metil ester juga juga semakin besar seiring meningkatnya temperatur operasi ekstraksi reaktif. Effect of Micro-Reactive Reactive Extraction Operation Condition For Biodisel Production Of Sunan Kemiri Seed In SituThe energy crisis based on fossil fuel has become a global problem because of its limited availability. Various attempts have been done to find another alternative fuels which have renewable characteristic and environmentally friendly, by using biofuel biodiesel. The aim of this research is to study the effect of process variable microwave reactive extraction to produce biodiesel from the “Sunan” seeds of candlenut. The main novelty and innovation of the developed process was extraction of Sunan candlenut oil and transesterification reaction occurs at one stage. Measurement was carried out in the Bioenergy Laboratory of Chemical Engineering Vocational School UNDIP and Separation Engineering Laboratory of Chemical Engineering UNTAG for 4 months. Activities carried out include: (i) designing and manufacturing reactive extractor microwave with capacity 5 liters / day, and (ii) study of the effect of reactive extraction process variable for biodiesel production. Process variables of extraction and methanolyisis from Sunan candlenut oil as an effort to increase productivity were divided into two types: independent  and dependent variable. Research has been conducted by grinding Sunan seed weight of 250 grams. Variable changed using parameter of reactive extraction temperature 50, 55, 60, and 65 ° C, and the ratio of methanol feed: Sunan seeds at  5: 1, 4: 1, 3: 1 and 2: 1. The results show that the reactive extractor microwaves produce biodiesel from the Sunan seeds has been fabricated as well. The greater the ratio of methanol- Sunan seed, the bigger of Sunan oil conversion to methyl ester. Increasing methyl ester also getting bigger with increasing operating temperature of reactive extraction.
Uji Unjuk Kerja Sistem Pengering Dehumidifier untuk Pengeringan Jahe Sri Utami Handayani; Rahmat Rahmat; Seno Darmanto
agriTECH Vol 34, No 2 (2014)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (272.313 KB) | DOI: 10.22146/agritech.9514

Abstract

Indonesian ginger market share has decreased in recent years due to competition with ginger products from other countries because of its quality still does not meet the standards. To meet the quality standards, post-harvesting processing technology should be improved. Some literature suggest that the active content of ginger will remain high after drying when the drying is performed at low or room temperature. So it will be more effective when done with a dehumidifier mechanism. This study aimed to test the performance of the dehumidifier drying equipment which includes distribution of temperature and humidity, drying capacity and capability. Dryer with a dehumidifier using a modified split AC by adding heater and a drying box. While the products studied are ginger. The results showed that the equipment is capable of producing inlet air temperature of 60°C and RH up to 0% as well as lowering the water content from 36% up to 0.1% in 7 hours.ABSTRAKPangsa pasar jahe Indonesia mengalami penurunan dalam beberapa tahun terakhir karena kalah bersaing dengan produk jahe dari negara lain akibat dari kualitasnya yang masih belum memenuhi standar.  Untuk memenuhi standar mutu, teknologi pengolahan pasca panen harus lebih dikembangkan. Beberapa studi literatur menunjukkan bahwa kandungan zat aktif jahe akan tetap tinggi apabila pengeringan dilakukan pada temperatur rendah sehingga akan lebih efektif bila dilakukan dengan mekanisme dehumidifier.Penelitian ini bertujuan untuk menguji unjuk kerja peralatan pengering dehumidifier yang meliputi distribusi suhu dan kelembaban udara, kapasitas dan kemampuan pengeringan. Peralatan pengering dengan dehumidifier menggunakan AC split yang dimodifikasi dengan menambahkan heater dan ruang pengeringan. Sedangkan produk yang diteliti adalah jahe. Hasil penelitian menunjukkan bahwa peralatan mampu menghasilkan udara dengan temperatur udara masuk ruang pengering 60 oC dan RH hingga 0% serta  menurunkan kadar air dari 36% hingga menjadi 0,1% dalam waktu 7 jam.
KAJIAN EKSPERIMENTAL KELAYAKAN DAN PERFORMA ALAT PENUKAR KALOR TIPE SHELL AND TUBE SINGLE PASS DENGAN METODE BELL DELAWARE Sri Utami Handayani; Didik Ariwibowo; Fauzi Kusuma NH2)
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2012): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 3 2012
Publisher : Prosiding SNST Fakultas Teknik

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Abstract

Peranan Alat Penukar Kalor dalam industri sangat besar, misalnya dipergunakan pada industri makanan, pembangkit tenaga listrik, perminyakan, transportasi, pendingin dan pemanas, dll. Pada umumnya Alat Penukar Kalor berperan dalam peningkatan efisiensi sistem. Penelitian ini bertujuan untuk mengetahui performa Alat Penukar Kalor tipe Shell and Tube Aliran Tunggal dengan Metode Bell Delaware. Penelitian dilakukan di Lab Konversi Energi PSD III Teknik Mesin Undip secara ekperimental dengan laju aliran pada shell sebesar 5 lpm dan laju aliran pada tube sebesar 10 lpm. Dari hasil perhitungan data diperoleh hasil bahwa nilai effectiveness peralatan adalah berkisar antara 0,4 – 0,5. Sedangkan nilai koefisien perpindahan kalor total alat penukar kalor 132,618 W/m2K.Kata kunci: penukar kalor, shell and tube single pass, bell delaware
PENINGKATAN PRODUKTIVITAS INDUSTRI KECIL MENENGAH CINCAU HITAM MELALUI PENERAPKEMBANGAN ALAT PEMERAS HIDRAULIK PRESS Mohamad Endy Yulianto; Zainal Abidin; Sri Utami Handayani; Mandy Ayulia Dwisukma; Hanifah Hanifah
Prosiding SNST Fakultas Teknik Vol 1, No 1 (2015): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 6 2015
Publisher : Prosiding SNST Fakultas Teknik

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Abstract

Kegiatan teknologi tepat guna ini bertujuan mengembangkan dan menerapkan alat proses  ramah lingkungan menggunakan mesin pemeras mekanis untuk produksi cincau hitam. Pengembangan dan penerapan alat pemeras mekanis pada UKM Cincau Hitam “Juragan Janggelan” di Weleri Kabupaten Kendal untuk mereduksi waktu pendinginan dan pemerasan dari 4 jam menjadi 2 jam, sehingga meningkatkan produktivitas. Pola pemecahan masalah yang diterapkembangkan secara umum dibagi menjadi empat tahap, meliputi: desain dan pabrikasi, pelatihan penggunaan alat, pengoperasian alat dan monitoring serta uji keandalan mesin. Parameter yang digunakan untuk mengukur hasil produksi dan keragamannya adalah kualitas produk (kekentalan), kecepatan pemeras mekanis, kapasitas produksi, dan waktu proses. Pemeras mekanis berupa hidraulik press terpabrikasi yang terdiri dari tangki pengepress, kawat filter, piston pengepres, dan penampung ekstrak. Rebusan tanaman janggelan dimasukkan ke dalam bak penyaring. Setelah isi bak seimbang, pompa piston hidraulik akan mengepres, sehingga cairan akan terlempar ke pinggir akibat gaya sentrifugal. Cairan tersebut akan menembus penyaring dan terkumpul pada casing luar, lalu dialirkan menuju bak penampung. Jika cairan sudah tidak mengalir, piston pengepres diturunkan. Setelah selesai kawat filter dapat dibersihkan dari sisa  ampas. Filtrat dapat  ditampung dalam bak penampungan. Hasil analisa produksi  menunjukkan bahwa alat pemeras mekanis yang diaplikasikan di UKM Juragan Janggelan mampu meningkatkan produktivitas mencapai 6,8%. Kata kunci : cincau hitam, janggelan, pemeras mekanis, produksi
PELATIHAN PENERAPAN MANUAL PROSEDUR PERAWATAN DAN PERBAIKAN MESIN PEMBUAT PELLET BAGI KELOMPOK TANI ASA MINA MULIA MIJEN SEMARANG Ireng Sigit Atmanto; Sri Utami Handayani; Seno Darmanto; Didik Ariwibowo
Jurnal Pengabdian Vokasi Vol 2, No 2 (2021): Nopember 2021
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (446.508 KB) | DOI: 10.14710/jpv.2021.12587

Abstract

Catfish is one source of animal protein that is highly nutritious and popular, so it has a bright prospect of cultivating by the community. In catfish farming, the main factor determining fish growth and production costs is fish feed.  It is easier to control the nutrient intake and reduce production costs if catfish farmers can make fish feed independently. Ownership of a fish pellet machine is advantageous for the fish farmer group because the machines can be used interchangeably. Members of the farmer group need to understand how to operate, maintain and repair fish pellet machines so that the machine has a longer service life. This community service activity provides maintenance and repair training for fish pellet machines for the farmer group Asa Mina Mulia Mijen, Semarang.
PENGEMBANGAN PRODUKTIVITAS MINUMAN KESEHATAN REMPAH-REMPAH MELALUI GRANULATOR YANG DILENGKAPI FOTO-PASTEURISASI–UV UNTUK MENINGKATKAN IMUN TUBUH Sutrisno Sutrisno; Mohamad Endy Yulianto; Didik Ariwibowo; Hermawan Dwi Ariyanto; Sri Utami Handayani
Jurnal Pengabdian Vokasi Vol 2, No 2 (2021): Nopember 2021
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (485.171 KB) | DOI: 10.14710/jpv.2021.12646

Abstract

[Development of Ginger-Based Herbal Beverages Using a Granulator and Photo-Pasteurization–UV to Boost Body Immunity] Ginger Emprit is a low-cost Indonesian spice with a high antioxidant content. Micro, Small and Medium Enterprises (MSMEs), such as Gendhis Manes in Ungaran, are the main producers of herbal beverage such as instant ginger drinks. In this UMKM, the traditional method of making instant ginger drink is still used, such as using a traditional stirrer instead of a stirrer. The granulator is used to speed up the production process. Through the use of a granulator or sub-critical extractor machine, as well as photo-pasteurization-uv, this operation intends to boost the productivity of MSME Gendhis Manes.
PENINGKATAN HYGIENITAS INDUSTRI TAHU MELALUI PERBAIKAN SISTEM PEMASAKAN DAN LINGKUNGAN KERJA Murni Murni; Sri Utami Handayani; Hermawan Dwi Ariyanto; Sutrisno Sutrisno; Didik Ariwibowo
Jurnal Pengabdian Vokasi Vol 2, No 2 (2021): Nopember 2021
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (629.585 KB) | DOI: 10.14710/jpv.2021.12515

Abstract

Tofu is one of the traditional Indonesian foods that are cheap and have high nutritional value. Consumption of tofu reaches more than 1.5 ounces/capita per week, and the trend continues to increase. Tofu production is generally carried out by Micro, Small and Medium Enterprises (MSMEs), including Berkah Jaya and Sumber Hidup in Ungaran. In these SMEs the production of tofu is still not hygienic, for example a container made of cement. The tofu rack is also not sufficient so that the tofu container is often placed on the floor. This activity aims to increase the productivity and hygiene of the tofu industry through replacing the barrel material from cement to stainless steel and making tofu container racks.
Mechanical Properties of Commercial Recycled Polypropylene from Plastic Waste Sri Utami Handayani; Muhamad Fahrudin; Wiji Mangestiyono; Alaya Fadlu Hadi Muhamad
Journal of Vocational Studies on Applied Research Volume 3, Issue 1, Year 2021 (April 2021)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (331.225 KB) | DOI: 10.14710/jvsar.v3i1.10868

Abstract

In Indonesia increasing the use of plastic will increase plastic waste because waste management in Indonesia is still poor. Plastics can be recycled and used to make plastic bags, toys and various household utensils, but their use is still very limited. This limitation is because the strength of recycled plastic is not as good as virgin plastic pellets, so the resulting product tends to be brittle. This study aims to determine the mechanical properties of plastics made from recycled polypropylene plastic. Five specimens are made according to the ASTM D 638 type II standard. The results show that yield strength is 16.357±2.65 MPa, elastic modulus 295,926 ± 41,97 MPa and ultimate tensile stress 19,701±1,261 MPa. The yield stress of recycled polypropylene has a lower value than the yield stress on recycled polypropylene studied by Abdelhaleem et.al or Barbosa et.al which is around 21 MPa[7][5]. This difference is possible due to the different quality of raw materials and processing.
Effect of Winglets on Improving Wind Turbine Performance Sri Utami Handayani
Journal of Vocational Studies on Applied Research Volume 3, Issue 1, Year 2021 (April 2021)
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (328.987 KB) | DOI: 10.14710/jvsar.v3i1.10906

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Indonesia, with the longest coastline in the world, has enormous potential to develop large-scale wind energy. In wind turbines, the formation of a wake behind the wind turbine can reduce efficiency. It is estimated that the formation of a vortex tip behind the wind turbine blade can be reduced by adding a winglet. The main function of winglets attached to the blade is to reduce the effect of the wingtip vortices which are generated due to 3D spanwise flow that occurs because of the pressure non- equalization between the upper and lower blade surfaces. This paper aims to summarize the results of research on the effect of adding winglets to wind turbines.
Co-Authors Alaya Fadlu Hadi Muhamad Didik Ariwibowo Didik Ariwibowo Didik Ariwibowo Fauzi Kusuma NH2) Hanifah Hanifah Hermawan Dwi Ariyanto Hermawan Dwi Ariyanto Ireng Sigit Atmanto Mandy Ayulia Dwisukma Margaretha Tuti Susanti Mohamad Endy Y Yulianto Mohamad Endy Yulianto Muhamad Fahrudin Mulyaningsih, M.F. Sri Murni Murni Rahmat Rahmat Rizka Amalia Rudi Firyanto Seno Darmanto Seno Darmanto Seno Darmanto Sutrisno Sutrisno Sutrisno Sutrisno Wiji Mangestiyono Windu Sediono Zainal Abidin