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Muldiani, Ratu Fenny
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The Effect of Capacitance on the Power Factor Value of Parallel RLC Circuits Hadiningrum, Kunlestiowati; Muldiani, Ratu Fenny; Pratama, Defrianto
Jurnal Internasional Penelitian Teknologi Terapan Vol 1 No 2 (2020): October 2020
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v1i2.27

Abstract

The power factor of the circuit is determined by the amount of pure resistance (R), self-inductance of the coil (L) and the capacitance of the capacitor (C). In this study, the measurement of the power factor value in a parallel RLC circuit was carried out through experimental testing and simulation with the value of C as the independent variable, while the values of R and L were fixed conditioned quantities. The purpose of this study was to determine the effect of capacitance on a parallel RLC circuit. One of the ways to improve the power factor value in a circuit is to install capacitive compensation using a capacitor. The relation between the power factor value and the capacitance and inductive reactance based on the experimental results and the simulation calculation results in the parallel RLC circuit both shows the same pattern with a relative uncertainty below 8%. The experimental results and simulation results both show that the power factor can be improved by using a right capacitance which is around the capacitance value when there is resonance in the circuit.
Pengaruh Main Overhaul pada Boiler Terhadap Kinerja Menggunakan Metode Direct Salsabila Gina Nursyfa; Ika Yuliyani; Ratu Fenny Muldiani
SURYA TEKNIKA Vol 11 No 1 (2024): JURNAL SURYA TEKNIKA
Publisher : Fakultas Teknik UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jst.v11i1.7325

Abstract

Boiler performance is critical for optimal operation, so it requires continuous monitoring to prevent performance degradation. Decreased performance can be caused by drying, reduced fuel and feed water quality, and poor maintenance. One preventive measure is to carry out an overhaul. This research analyzes the effect of overhaul on boiler performance using data before and after overhaul, with a focus on the evaporation ratio and boiler efficiency. The research results show an increase in the evaporation ratio from 17.26 to 18.23 and efficiency from 77.12% to 79.56% after overhaul. This increase shows that the overhaul has succeeded in improving boiler performance. Increased boiler performance occurs as a result of overhaul activities, which include cleaning and replacing equipment. This maximizes heat transfer between the feed water and the gases resulting from fuel combustion.
Pelatihan Penggunaan Aplikasi Homer untuk Optimasi PLTS oleh Tim Polban kepada Mahasiswa UNTL Timor Leste Wuryanti, Sri; M., Bambang P.; Sasono, Teguh; M., Ignatius R.; Pudin, Apip; M., Wahyu B.; Saodah, Siti; M., Ratu Fenny; Eliana, Bella; Mutiarani, Rizky
Jurnal SOLMA Vol. 13 No. 3 (2024)
Publisher : Universitas Muhammadiyah Prof. DR. Hamka (UHAMKA Press)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/solma.v13i3.15950

Abstract

Pendahuluan: Kawasan Timor Leste beriklim tropis kering dengan curah hujan sedang, dengan iklim tersebut, penduduknya bisa memanfaatkan matahari sebagai sumber energi. Potensi alam ini dapat dimanfaatkan untuk menyelesaikan permasalahan pemadaman listrik yang sering tejadi khusus di Desa Macadai de Baixo sebuah desa yang terletak di Bucoli, Timor Leste. Studi ini bertujuan untuk menyelesaikan permasalahan masyarakat Timor Leste  mengenai pemadaman listrik melalui sumber daya manusia. Metode: Software HOMER (Hybrid Optimization of Multiple Energy Resources) dan diikuti oleh 25 mahasiswa UNTL. Hasil: Mahasiswa bisa menjalankan aplikasi dan mengoptimasi PLTS yang nantinya dapat diterapkan untuk membangun PLTS di desa Macadai de Baixo. Kesimpulan: Pelatihan ini memberikan manfaat kepada masyarakat karena dapat menyelesaikan permasalahan tentang PLTS di wilayah Timor Leste.
PENERAPAN TEKNOLOGI INSINERASI SEDERHANA DAN PEMANFAATAN ABU UNTUK PRODUK PAVING BLOCK DI BANK SAMPAH CEMPAKA Muldiani, Ratu Fenny
Jurnal Difusi Vol. 6 No. 2 (2023): Jurnal Difusi
Publisher : Pusat Penelitian dan Pengabdian Masyarakat (P3M) Politeknik Negeri Bandung

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Abstract

Pengelolaan sampah menjadi tantangan utama di Desa Ciwaruga akibat tingginya timbulan sampah rumah tangga yang belum tertangani secara optimal. Program pengabdian ini bertujuan untuk mengatasi permasalahan tersebut melalui penerapan teknologi insinerasi sederhana dan pemanfaatan abu sisa pembakaran sebagai bahan campuran pembuatan paving block. Metode pelaksanaan meliputi identifikasi kebutuhan mitra, studi literatur, penyediaan insinerator, pelatihan teknis, penyusunan SOP, serta peningkatan partisipasi warga melalui sistem tabungan sampah. Hasilnya menunjukkan keberhasilan operasional alat, tersusunnya SOP yang aplikatif, serta peningkatan peran serta masyarakat dalam pengelolaan sampah. Kesimpulannya, teknologi ini terbukti efektif secara teknis dan sosial, serta berpotensi direplikasi di wilayah serupa sebagai solusi berkelanjutan dalam manajemen sampah berbasis komunitas.
Peningkatan Usaha Bank Sampah Cempaka 2 Desa Ciwaruga Melalui Media Online untuk Meningkatkan Kesejahteraan Warga H., Kunlestiowati; Muldiani, Ratu Fenny; Purwaningsih, S.S.; Yuningsih, Nani; Agoes, Farida
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 4 No. 4 (2023): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN)
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v4i4.2161

Abstract

Kegiatan Pengabdian kepada Masyarakat bertujuan untuk mengetahui strategi pemasaran yang tepat untuk Bank Sampah Cempaka 2 yang terletak di RW 02 Desa Ciwaruga Kabupaten Bandung Barat. Pendirian Bank Sampah ini dilatarbelakangi perlunya pengelolaan banyaknya sampah yang menumpuk, yang berasal dari sampah rumah tangga dan terkumpul di wilayah RW 02 Desa Ciwaruga Kabupaten Bandung Barat. Namun dalam pengelolaan Bank Sampah Cempaka 2 ini terdapat kendala dalam bidang pemasaran produk. Berdasarkan analisis situasi tersebut, rendahnya tingkat penjualan produk bank sampah menjadi isu utama yang dialami mitra, sehingga diperlukan adanya kemampuan memasarkan produk-produk bank sampah melalui media online adalah permasalahan utama yang dihadapi mitra. Sebagai solusi atas permasalahan yang terjadi diselenggarakan beberapa kegiatan bersama mitra  antara lain Pelatihan sistem pencatatan yang berkaitan dengan produksi dan penjualan produk mitra, Pendampingan mitra untuk merencanakan program pemasaran produk-produk bank sampah, termasuk menentukan platform media online dan marketplace yang akan digunakan, Pelatihan pembuatan akun bisnis pada media online yang telah ditentukan dalam perencanaan program pemasaran, serta Pelatihan dan pendampingan untuk mitra dalam menggunakan media online untuk pemasaran produk-produk bank sampah. Kegiatan ini memiliki tingkat partisipasi yang tinggi dari mitra yang memberikan dampak positif bagi pelaksanaan program yaitu meningkatnya kreativitas mitra dalam pembuatan produk daur ulang sampai memiliki nilai ekonomi yang tinggi, membantu tercegahnya dari pencemaran lingkungan. Selain itu, melalui digital marketing (media online) dapat menghasilkan peluang pemasaran produk secara nasional dan internasional.
Perbandingan Efisiensi Energi Genset Menggunakan Bahan Bakar Biogas dan LPG pada Berbagai Tingkat Beban Listrik Hadiningrum, Kunlestiowati; Muldiani, Ratu Fenny; Pratama, Defrianto
Jurnal Pendidikan Kimia, Fisika dan Biologi Vol. 1 No. 2 (2025): Maret : Jurnal Pendidikan Kimia, Fisika dan Biologi
Publisher : Asosiasi Riset Ilmu Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupenkifb.v1i2.220

Abstract

Biogas is an alternative energy source that is environmentally friendly, cheap, easy to obtain and renewable. In general, all types of organic materials can be processed to produce biogas, however only homogeneous organic materials (solid and liquid) such as manure and urine (urine) of livestock are suitable for a simple biogas system. Biogas can be burned like LPG and on a large scale can be used to generate electricity, so that biogas can be used as an alternative energy source that is environmentally friendly and renewable. To determine the performance of biogas as an alternative energy source, in this research the method used is to compare the performance of Biogas with LPG gas as a source of electrical energy. Analysis of trial data per minute (RPM), with varying load levels, shows that the RPM of generators using LPG only decreases slightly as the electrical load increases, which shows that the generator is able to maintain more consistent performance. The RPM produced by LPG, which ranges from 2358 to 2420 RPM, indicates that the engine is running faster and more efficiently, while biogas has a lower RPM, ranging from 1715 to 1820 RPM, which indicates slower operation. LPG efficiency ranges from 89.60% to 98.12%, while biogas efficiency ranges from 74.67% to 89.60%. Even though biogas shows less stable performance than LPG, biogas still has potential as an alternative fuel, especially in areas that have limited access to LPG but have abundant sources of biogas raw materials. The use of biogas can reduce dependence on fossil fuels and reduce greenhouse gas emissions. Even though LPG is more efficient, biogas has significant potential to be developed as a more environmentally friendly alternative energy source because LPG relies on non-renewable fossil fuels and has a negative impact on the environment in the long term.
Perancangan Sistem Hibrid Berbasis Panel Surya dan LPG Sebagai Energi Alternatif Terbarukan Pratama, Defrianto; Hadiningrum, Kunlestiowati; Muldiani, Ratu Fenny
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 9 No. 1 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A Hybrid System Based on Solar Panels and LPG offers an alternative energy solution that combines renewable solar energy with LPG for improved efficiency and reliability. Solar panels capture sunlight and convert it into electricity, which can be used immediately or stored in batteries for later use, such as at night or during cloudy weather. Solar energy is eco-friendly, renewable, and widely available. However, when solar energy is insufficient, LPG is used as a backup fuel for a generator to ensure continuous power supply. Although not renewable, LPG is cleaner than other fossil fuels like coal or oil. The hybrid system's advantage lies in its efficiency, as solar panels reduce LPG consumption, while LPG ensures uninterrupted power. This combination makes the system more reliable by providing energy even when one source is unavailable. Despite the use of LPG, this system is more environmentally friendly than relying solely on fossil fuels, as it reduces the overall need for LPG. Keywords: Solar Cells, LPG, Hybrid
Penggunaan Pewarna Alami Untuk Ecoprint Dalam Meningkatkan Ekonomi Kreatif yang Berkelanjutan di Ciwaru Desa Arjasari Amalia Zia Salma; Riniati; Endang Widiastuti; Ari Marlina; Bevi Lidya; Ratu Fenny Muldiani
Jurnal Pengabdian Kepada Masyarakat (MEDITEG) Vol. 10 No. 2 (2025): Jurnal Pengabdian Kepada Masyarakat (MEDITEG)
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Tanah Laut (Politala)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34128/mediteg.v10i2.386

Abstract

Kampung Ciwaru, Desa Arjasari Kabupaten Bandung merupakan kawasan yang sangat potensial dengan sumber daya tanaman untuk ecoprint. Kegiatan Pengabdian Kepada Masyarakat (PKM) di daerah ini bertujuan untuk pemberdayaan masyarakat dengan mengajarkan teknik ecoprint menggunakan pewarna alami lokal. Pelatihan ini melibatkan 15 peserta sebagai perwakilan kelompok karang taruna. Beberapa tanaman lokal yang  di eksplor untuk pewarna alami ecoprint di antaranya: daun kopi, daun mangga, daun jati, daun ketapang dengan variasi warna yang dihasilkan: hijau, merah dan abu-abu. Sedangkan motif daun yang diunggulkan dari daerah ini yaitu  daun singkong, daun afrika, daun jati serta bunga-bunga yang banyak tersedia di sekitar. Indikator hasil terukur meliputi peningkatan keterampilan peserta, pemahaman yang meningkat 74,16% setelah evaluasi kegiatan serta adanya 50 produk ecoprint yang layak jual berupa kain, pasmina, tas, outer dan topi yang dipasarkan melalui galeri "Ciwaru Ecoprint".  Kontribusi keberlanjutan terletak pada pengembangan ekonomi kreatif ramah lingkungan, memperkuat ketahanan ekonomi melalui kreativitas dan inovasi berbasis ecoprint.
PEMBERDAYAAN WARGA RW 14 CIBALIGO DALAM MENGOLAH SAMPAH ORGANIK MENGGUNAKAN KOMPOSTER AEROB SEDERHANA Suprianti, Yanti; Utami, Sri; Muldiany, Ratu Fenny; Gantina, Tina Mulya
Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 9, No 1 (2026): Kumawula: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kumawula.v9i1.62012

Abstract

Waste management has become an acute problem for the Bandung Raya area. The government has so far applied the landfill method at the final disposal site (TPA). This method is not an effective way to manage waste, as evidenced by the fire at the end of 2023 at the Sarimukti TPA, which resulted in a waste emergency in Bandung, driven by methane gas that emerged from the waste mountain. The decision of the West Bandung Regency government to limit the volume of waste transported and encourage people to manage their own waste has unsettled residents who are not ready to do so. This was observed in the RW 14 Cibaligo area, which led to organic waste piling up and causing health and environmental hazards. This issue must be resolved immediately by raising awareness among residents to manage their waste from home. This activity is carried out using counseling methods and practicing waste sorting and composting of organic waste, followed by monitoring the organic waste composting process in an aerobic composter, which produces two main products, namely compost and liquid organic fertilizer (POC). This activity has succeeded in increasing public knowledge and understanding regarding the sorting and processing of organic waste, and has led residents to produce fertilizer for their own needs. The results of compost and POC show good characteristics, based on aspects such as volume content, humidity, acidity level, compost temperature, as well as the presence of odors and animals, and aspects of dissolved solids concentration, salinity, conductivity, and acidity level of POC. These results are expected to encourage residents to remain consistent in managing their waste from their own homes, so that the environment becomes clean and healthy.Permasalahan pengelolaan sampah sudah menjadi beban akut wilayah Bandung Raya. Pemerintah selama ini menerapkan metode land fill di tempat pembuangan akhir (TPA). Metode ini bukan cara efektif dalam pengelolaan sampah, terbukti telah terjadi kebakaran pada akhir tahun 2023 di TPA Sarimukti yang mengakibatkan Bandung darurat sampah yang didorong oleh produksi gas metana dari gunungan sampah. Keputusan pemerintah Kabupaten Bandung Barat yang membatasi volume sampah yang diangkut dan mendorong masyarakat untuk mengelola sampahnya sendiri, menyebabkan kekagetan warga yang belum siap untuk melakukannya. Hal ini ditemui di wilayah RW 14 Cibaligo yang mengakibatkan sampah organik menumpuk dan menimbulkan bahaya kesehatan dan lingkungan. Hal ini harus segera diselesaikan, dengan menggugah kesadaran warga untuk mengelola sampahnya semenjak dari rumah. Kegiatan ini dilakukan dengan metode penyuluhan dan praktek pemilahan sampah serta  pengomposan sampah organik, diikuti dengan pemantauan proses pengomposan sampah organik dalam komposter aerob yang menghasilkan dua produk utama, yaitu pupuk kompos dan pupuk organik cair (POC). Kegiatan ini berhasil meningkatkan pengetahuan dan pemahaman masyarakat mengenai pemilahan dan pengolahan sampah organik, dan mengantarkan warga menghasilkan pupuk untuk keperluannya sendiri. Hasil kompos dan POC menunjukkan karakteristik yang baik, dengan meninjau aspek volume keterisian, kelembapan, tingkat keasaman, dan temperatur kompos, serta timbulan bau dan binatang yang muncul, juga aspek konsentrasi padatan terlarut, salinitas, konduktivitas, serta tingkat keasaman POC. Hasil ini diharapkan mendorong warga terus konsisten dalam mengelola sampahnya semenjak dari rumah sendiri, sehingga lingkungan menjadi bersih dan sehat.
Design of Rice Husk Rotary Dryer using Waste Heat Electrostatic Precipitator of The Cement Industry ASTI DESI FITRIYANI; RATU FENNY MULDIANI; SRI WURYANTI
Journal of Green Science and Technology Vol 7 No 3 (2023): Journal of Green Science and Technology Vol.7 No.3 Special Edition : Applied scie
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v7i3.35

Abstract

ESP or electrostatic precipitator is a device used to capture particulate matter, such as dust, in exhaust gases using electrostatic principles. In the cement industry, ESP is commonly placed after the clinker cooler to clean the exhaust air from the cooling process, ensuring it is free from clinker dust. The clinker cooler is a device that cools down the clinker using air, reducing its temperature from an initial temperature of around 1450°C to approximately 100°C - 120°C. The exhaust air from the clinker cooler is then passed through the ESP at temperatures ranging from around 237°C to 311°C. Based on the temperature data, the exhaust air from the ESP has the potential for heat reuse for other processes, including as a heat source for drying rice husk, which is a common alternative fuel used in the cement industry and typically has a moisture content of around 25%-37%. The results of this design indicate that the exhaust heat from the ESP, with an input temperature of 275°C, is capable of drying rice straw pellets from a moisture content of 25% to 14.73% using a designed rotary dryer with a capacity of 21.6 t/h, a length of 41.58 m, and a diameter of 2.92 m. It is constructed using ASTM 283 C material with a thickness of 8.76 mm and is insulated with a 15.6 mm thick layer of aluminum foil
Co-Authors Adistia Prajani Agoes, Farida Alisa Gandini Suganda Amalia Zia Salma Anny Suryani Ari Marlina ASTI DESI FITRIYANI Bevi Lidya Budi Suharto Chatarina Umbul Wahyuni Defrianto Pratama Eliana, Bella Euis Sartika Fadhila, Nisya Fitri Farida Agoes Farida Agoes GANTINA, TINA MULYA H., Kunlestiowati Hadiningrum, Kunlestiowati Hesti Sekar Sari I Gede Rasagama Ijlal Syaifullah Koesoemah, Nita Hernita Kunlestiawati Kunlestiawati Kunlestiowati Handinigrun Lusiani, Anie M., Bambang P. M., Ignatius R. M., Wahyu B. Mutiarani, Rizky Nani Yuningsih Nani Yuningsih, Nani Neneng Nuryati Nita Henita Koesoemah nita henita koesoemah PUDIN, APIP Purwaningsih, S.S. Riniati Salsabila Gina Nursyfa Sapto Prajogo Siti S Purwaningsih Siti Samsiyah Purwaningsih Siti Samsiyah Purwaningsih SITI SAODAH Siti Syamsiah Purwaningsih Sri Nur Yuliyawati Sri Nuryuliyawati Sri Suratmi Sri Suratmi Sri Utami Sri Widarti Sri Widarti Sri Wuryanti Sri Wuryanti Sri Wuryanti Teguh Sasono Tri Wibianto Widiastuti, Endang YANTI SUPRIANTI, YANTI Yuliyani, Ika