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Rahmat Iman Mainil
Universitas Riau
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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EVALUASI KINERJA DIRECT EXPANSION SOLAR-ASSISTED HEAT PUMP WATER HEATER KAPASITAS 30 LITER DENGAN MENGGUNAKAN REFRIGERAN R134A Irawan, Teguh; Mainil, Rahmat Iman; Aziz, Azridjal
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1502

Abstract

Experiments were carried out to determine the performance of a direct expansion solar assisted heat pump water heater (DX-SAHPWH) which mainly consists of an evaporator panel with a surface area of ​​0.23 m2, a rotary compressor with an input power of 122.5 W, an insulated water tank that has been wrapped around a condenser with a diameter of 0.024 m and a length of 15 m and a capillary tube with a diameter of 0.001 m and a length of 1.61 m. Tests were carried out in open spaces, enclosed spaces and air-conditioned rooms exposed to direct sunlight. The results of this test are that the highest coefficient of performance (COP) on the DX-SAHPWH system is obtained at 1,25 and the smallest COP is obtained at 0.60. The higher intensity of solar radiation has a positive effect on the performance of the DX-SAHPWH system, which results in the heat transfer rate at water (Q wm) increases, the time required for heating is faster, and the COP of the DX-SAHPWH system increases.
Pengembangan Pemasaran Produk Ikan Patin Berkualitas Berbasis Pasar Online di Rumbai Bukit Pekanbaru Mainil, Rahmat Iman; Hasibuan, Saberina; Syawal, Henni; Darfia, Novreta Ersyi; Martina, Atria
Unri Conference Series: Community Engagement Vol 6 (2024): Seminar Nasional Pemberdayaan Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/unricsce.6.101-110

Abstract

The Mina Usaha Fish Cultivation Group (Pokdakan) is located in the Rumbai Bukit area, Rumbai District, Pekanbaru, Riau with patin fish as the main aquaculture commodity. Community service activities that overcome the problem of cultivated fish often experiencing mass mortality have been carried out in the first year by increasing knowledge about aspects of aquaculture activities. The problems faced by cultivators in terms of providing quality feed and pond sedimentation rate have also been carried out in the second year. In this third year, processing and marketing activities for various quality patin fish products based on the online market are carried out. The harvest from the Mina Usaha Pokdakan cultivation pond has not been processed optimally into processed products due to the limited knowledge and skills of cultivators in product processing. Assistance and coaching in the processing of harvested products and the development of marketing of various quality patin fish products based on the online market are the main focus of service activities. The activities carried out are preparation for implementation, surveys and market analysis to identify superior patin fish products, discussions and consultations to design product development strategies in tandem with online platform development activities, delivery of materials to empower cultivators in the aspects of maintenance, processing, and improvement of product quality and materials on the use of online platforms, and the implementation of diversified products is carried out through product procurement, promotions, and online advertising. The products that were successfully made were nuggets, fish balls, and surimi. This frozen food product has also been successfully sold through the online market. Implementation evaluations are carried out on an ongoing basis to ensure the effectiveness of activities and allow for adjustments if necessary. The results of the evaluation showed that the enthusiasm of the participants who participated in the activity was very high.
Potensi Kulit Kayu Sebagai Sumber Serat Alam untuk Penguat pada Biokomposit yang Ramah Lingkungan dan Terbarukan: Artikel Review Yoan Perima; Rahmat Iman Mainil
JURNAL SURYA TEKNIKA Vol. 11 No. 2 (2024): JURNAL SURYA TEKNIKA
Publisher : Fakultas Teknik UMRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jst.v11i2.8328

Abstract

The increasing awareness of environmental issues has influenced the use of eco-friendly materials, one of which is the use of natural fibers in biocomposites. Plant fibers are one of the sources of natural fibers that can be used as reinforcement in polymer matrix composites. Various studies have been conducted on many types of plants to explore sources of natural fibers. One natural fiber that has potential as a reinforcement in biocomposites is fiber from bark. In terms of physical and chemical properties, bark fibers can meet the criteria for reinforcement in polymer matrix composites. The tensile strength of single fibers from various types of bark ranges from 243.94 MPa to 1608 MPa. When compared to other natural fibers, such as ramie fiber with a tensile strength of 408 MPa and areca palm petiole fiber with 104.12 MPa, it can be concluded that bark fibers are equivalent to or even stronger than several other types of natural fibers. This review aims to provide background and information about the potential of bark fibers through several characterizations and tests, allowing for conclusions to be drawn regarding the feasibility of bark fibers as reinforcement in polymer matrix composites.
The Application of Numerical Study for Dynamic Vibration Absorber in Suspension System to Improve Four Wheel Vehicle Comfort Hafizah, Hafizah; Mainil, Rahmat Iman; Abdurrahman, Ridwan; Nazaruddin, Nazaruddin
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 1 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i1.384

Abstract

This study aims to develop a Dynamic Vibration Absorber (DVA) for a four-wheeled vehicle, specifically the "Toyota Fortuner 4.0 V6 SR" model. The quarter vehicle structure was modeled as a two degree of freedom system with disturbances in the form of road contours and speed. The natural frequency of the DVA was designed to be equal to the lowest natural frequency of the vehicle. Hence, if the vehicle moved at a speed or road contour disturbance close to its natural frequency, the vibration energy will be transferred or received by the DVA so that the vehicle structure did not oscillate. Two DVAs were mounted on the top of the vehicle body. The results obtained the vibration that occurs when the disturbance frequency was closed to the lowest natural frequency of the ¼ vehicle structure. It was significantly reduced by the addition of two DVAs. The design model of the ¼ vehicle test structure and Dynamic Vibration Absorber (DVA) in this study can be used as a reference for the implementation of experiments. The results of experimental calculations can be compared with the results of theoretical calculations to strengthen the credibility of the results.
Optimalisasi Pemasaran Produk Olahan Ikan Patin melalui Pemanfaatan Pasar Online Hasibuan, Saberina; Iman Mainil, Rahmat; Syawal, Henni; Darfia, Novreta; Martina, Atria
CARADDE: Jurnal Pengabdian Kepada Masyarakat Vol. 7 No. 3 (2025): April
Publisher : Ilin Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31960/caradde.v7i3.2966

Abstract

Desa Rumbai Bukit Pekanbaru memiliki potensi perikanan yang cukup besar, terutama dalam budidaya ikan patin. Pengabdian ini bertujuan untuk mengoptimalisasikan pemasaran produk olahan ikan patin melalui pemanfaatan pasar online. Kegiatan Pengabdian kepada Masyarakat ini dilaksanakan dengan metode pelatihan secara langsung yang terdiri dari 4 tahapan dengan melibatkan mitra para pembudidaya ikan patin dan masyarakat di Rumbai Bukit Pekanbaru. Tahapan 1 yaitu identifikasi masalah dan kebutuhan pembudidaya dan masyarakat; 2. pelaksanaan pelatihan dan workshop; 3. pendampingan dan 4. evaluasi dan monitoring. Produk olahan ikan patin memiliki potensi pasar yang besar. Program pengabdian masyarakat ini telah berhasil membantu para pembudidaya dan pelaku usaha olahan ikan patin di Rumbai Bukit menggunakan pasar online sebagai alat pemasaran yang efektif. Produk olahan ikan patin yang telah dikemas yaitu nugget, bakso, dan surimi. Produk-produk ini dibuat dari daging ikan patin segar berkualitas tinggi yang dipanen langsung dari kolam budidaya Pokdakan Mina Usaha dan dipasarkan dalam bentuk frozen food. Hasil evaluasi menunjukkan terjadi peningkatan pengetahuan dan keterampilan pemasaran digital; peningkatan penjualan dan jangkauan pasar; dan pengelolaan pengiriman yang lebih baik. Capaian dari 4 kriteria pertanyaan pengolahan produk ikan patin, seperti pengolahan produk ikan patin, pemasaran produk olahan ikan patin, harga produk olahan ikan patin, dan prospek pengembangan usaha produk olahan ikan patin masih dibawah 60%. Namun demikian sudah bisa dikatakan memadai untuk mengoptimalisasi pemasaran produk olahan ikan patin melalui pemanfaatan pasar online.
Experimental study on a laboratory-scale archimedes screw turbine using pitch-to-diameter ratio for low-head hydropower Helmizar Helmizar; Nurcholish Windiharto; Yovan Witanto; Afdhal Kurniawan Mainil; Rahmat Iman Mainil; Khotso Sai
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.6690

Abstract

The Archimedes screw is a hydropower technology well-suited for low-head applications This study investigates the performance of a laboratory-scale Archimedes screw turbine for low-head hydropower applications by varying pitch-to-diameter ratio (P/D = 0.3, 0.38, 0.45, 0.52) and inclination angle (β = 22°, 25°, 27°). Experiments were conducted in a controlled water flow environment to evaluate torque, power output, and efficiency at different rotational speeds. Results indicate that both P/D and β significantly influence energy conversion. The highest performance was achieved at P/D = 0.45 and β = 22°, producing a peak torque of 0.36 Nm, a power output of 2.4 W, and a maximum efficiency of 52.37%. Lower inclination angles contributed to improved hydraulic energy capture due to better water filling and reduced slippage. These findings highlight the importance of optimizing geometric parameters to enhance turbine performance in small-scale, sustainable energy systems. The results offer design guidance for implementing Archimedes screw turbines in rural or off-grid low-head hydropower scenarios.
The Characterization Methods of Natural Fibers (Cellulose Fibers) as Reinforcement for Polymer Matrix Composites: A Review : Natural Fibers Characterization Perima, Yoan; Iman Mainil, Rahmat
Jurnal Rekayasa Mesin Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i2.6663

Abstract

The interest in using natural fibers as reinforcement in polymer matrix composites is increasing, driven by their abundant availability, biodegradability, and significantly lower production costs compared to synthetic fibers. The cellulose content in natural fibers has a significant impact on the mechanical properties and thermal stability of the fibers, ultimately affecting the mechanical strength of the composites. To enhance the cellulose content in the fibers, one approach is to use alkali treatment with a NaOH solution on the fibers. To evaluate the effectiveness of the chemical treatment and study the physical and mechanical characteristics of the fibers, as well as to assess the potential and feasibility of the fibers as reinforcement in polymer matrix composites, a series of characterizations or tests on the fibers needs to be conducted. This review article will discuss in depth the methods of characterizing natural fibers and the influence of their physical and mechanical properties on composite strength. This article is expected to provide a positive contribution to the development of polymer matrix composite materials reinforced with natural fibers.
Design of Air Blast Freezing System Using Cascade Refrigeration R290/R32 System with Capacity 5kg Martin, Awaludin; Nasution, Fikri Fahlevi; Mainil, Rahmat Iman
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 68 No 1 (2024): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v68i1.359

Abstract

Indonesia is a maritime country that has an abundance of marine catches. In 2022, the production of marine catches reached 24.85 millions tons, while the export amount was 1.221 millions tons. This is due to the limited technology that can extend the freshness of marine catches. Based on this problem, a cooling system was designed in the form of an ABF that can freeze marine catch products. The Air Blast Freezing (ABF) system is designed at an air temperature of -40oC using a cascade refrigeration system. The working fluid used is R290/R32 hydrocarbon, which has very low GWP and ODP so it is safe for the environment and the earth's ozone layer. The results obtained show that the cooling load is 444.037 Watts, the LTC compressor power and HTC compressor power are 116.19 Watts and 205.98 watts. The designed air blast freezing system has a surface area of LTC evaporator of 2.670 m2 and HTC condenser of 4.780 m2. The calculated capillary pipe length is 1.94 m for HTC and 1.51 m for LTC, the COP of the ABF system is 2.774.
EVALUASI KINERJA DIRECT EXPANSION SOLAR-ASSISTED HEAT PUMP WATER HEATER KAPASITAS 30 LITER DENGAN MENGGUNAKAN REFRIGERAN R134A Irawan, Teguh; Mainil, Rahmat Iman; Aziz, Azridjal
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1502

Abstract

Experiments were carried out to determine the performance of a direct expansion solar assisted heat pump water heater (DX-SAHPWH) which mainly consists of an evaporator panel with a surface area of ​​0.23 m2, a rotary compressor with an input power of 122.5 W, an insulated water tank that has been wrapped around a condenser with a diameter of 0.024 m and a length of 15 m and a capillary tube with a diameter of 0.001 m and a length of 1.61 m. Tests were carried out in open spaces, enclosed spaces and air-conditioned rooms exposed to direct sunlight. The results of this test are that the highest coefficient of performance (COP) on the DX-SAHPWH system is obtained at 1,25 and the smallest COP is obtained at 0.60. The higher intensity of solar radiation has a positive effect on the performance of the DX-SAHPWH system, which results in the heat transfer rate at water (Q wm) increases, the time required for heating is faster, and the COP of the DX-SAHPWH system increases.
Optimizing Steam to Electricity Ratio in Crude Palm Oil Refinery Captive Power Plant: A Six Sigma-DMAIC Capability Assessment Anggriawan, Akbar; Susilawati, Anita; Mainil, Rahmat Iman
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 3 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i3.552

Abstract

This study applies the Six Sigma-DMAIC (Define, Measure, Analyze, Improve, Control) methodology combined with process capability analysis to enhance energy efficiency, specifically by reducing the steam to electricity ratio of a steam turbine. Initial measurements indicated a steam-to-electricity ratio of 4.5 to 5.34 kg/kWh, highlighting high steam consumption and poor efficiency. The process was unstable, with Cp and Cpk values of 0.30 and -0.16, and a defect rate exceeding 560,000 DPMO. Using an Ishikawa diagram, a vacuum leak in the steam turbine condenser was identified as the main cause of excessive steam consumption. After repairing the condenser, monitoring showed significant improvements, with the steam to electricity ratio reducing to 3.0 – 4.0 kg/kWh. Process capability improved, with Cp increasing to 1.39, Cpk to 1.02, and Z-bench to 3.05 (equivalent to 1,143 DPMO). The Anderson-Darling test confirmed a normal distribution (p-value = 0.464). Six Sigma-DMAIC effectively optimized steam turbine performance.
Co-Authors Abd. Rasyid Syamsuri Adha, Aidil Adi Hans Purba Adriyus putra Afdhal Kurniawan Mainil Ahmad Surya Ahmad Wisnu Sulaiman Anggriawan, Akbar Anita Susilawati Atria Martina Aulian Samri Awaludin Martin Aziz, Azdrizal Azridjal Aziz Bungsu Herwanto Cahyati, Wulan Dani Ikhsan Putra Darfia, Novreta Deni Kurniawan Dicky Ikhwandi Eigko Malau Eko Saputra Faisal Afif Faisal Tanjung Farida Isroani Ferly Septian Iskandar Gihon Matondang Giri Saputra Gontor Andrapica Gordon HTTM Hasra Rafika Helmizar - Hendra Abdul Aziz Hendrik Syahputra Henni Syawal Herisiswanto ' Herisiswanto, Herisiswanto Irwandi Hidayat Izzuddin Ali Raja Siregar, Izzuddin Ali Raja Izzudin Ali Raja Siregar Jenvrizen, David KHOIRUL ANAM Khotso Sai Listiono, Hendra luthfi afiif yazu Muh Wira Tri Kusuma, Muh Wira Tri Muhammad Faizal Syukrillah Muhammad Faizal Syukrillah, Muhammad Faizal Muhammad Ilham Muhammad Rif’at Syahnan N. Nazaruddin Nasution, Fikri Fahlevi Nofriadi Nofriadi Novreta Ersyi Darfia NST, Berriansyah Cipta Nugrah Suryanto Nurcholish Windiharto Nurman Saputra Nurul Deswita P. Eko Prasetyo Perima, Yoan Purba, Adi Hans Putra, Rio Ahmad Juliansyah Rahman Asfaranda Renaldi Khaesar Kumara Renhard Niptro G, Renhard Niptro Renhard Niptro Gultom Ridwan Abdurrahman Ruben Siregar Saberina Hasibuan Sarwo Fikri Sayfri Syafri Solly Aryza Suprayitno Suprayitno Surya, Ahmad Syafri ' Teguh Irawan Thalal, Thalal Tio Vani Nesri Utari Prayetno Wandi Wahyudi Yandra, Vicky Yoan Perima Yovan Witanto