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All Journal Jurnal Sains dan Teknologi Jurnal Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Teknologi Rekayasa Mesin Jurnal Mechanical Jurnal Rekayasa Mesin Turbo : Jurnal Program Studi Teknik Mesin CARADDE: Jurnal Pengabdian Kepada Masyarakat Energi & Kelistrikan Jurnal Teknik Mesin Indonesia Jurnal Surya Teknika Unri Conference Series: Community Engagement Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) METAL : Jurnal Sistem Mekanik dan Termal SAINSTEK Aceh International Journal of Science and Technology Jurnal Polimesin Prosiding SNTTM
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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Optimizing Preventive Maintenance to Improve Operational Efficiency and Reduce Maintenance Costs - Review Article Ilham, Muhammad; 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.v69i3.483

Abstract

The Total Productive Maintenance (TPM) approach is one of the main operational strategies to improve production efficiency and reduce maintenance costs. This article reviews the important role of TPM components, especially the Planned Maintenance System (PMS) and Computerized Maintenance Management System (CMMS), in supporting operational performance. The implementation of these systems involves structured data collection and systematic analysis to improve predictive and preventive maintenance. This article also highlights the success factors and obstacles to implementing TPM, PMS, and CMMS, including management commitment, employee training, technology integration, and challenges such as resistance to change and system complexity. The review results show that cross-functional collaboration, a continuous improvement mindset, and the use of advanced technology are the keys to success in optimizing equipment maintenance, reducing downtime, and increasing operational efficiency and cost effectiveness. Across reviewed studies, operational efficiency increased by 12–35% and maintenance costs decreased by 10–30% after adopting TPM, PMS, or CMMS. These findings emphasize the critical role of digital integration and proactive culture in maintenance optimization.
Analysis Energy of Freeze Vacuum Drying System with Thermal Energy Storage and Reverse Valve of 4kg Capacity NST, Berriansyah Cipta; Cahyati, Wulan; Mainil, Rahmat Iman; Martin, Awaludin
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.v69i3.541

Abstract

This research evaluates the energy efficiency of the Aloe vera drying process using a Freeze Vacuum Drying (FVD) system, focusing on the thermal performance and the role of a Thermal Energy Storage (TES) unit with paraffin wax as the storage medium. Experiments were conducted with Aloe vera samples of 2 kg, 3 kg, and 4 kg to assess their effects on energy usage, Coefficient of Performance (COP), and moisture removal efficiency. The highest Specific Moisture Extraction Rate (SMER) was 0.132 kg.water/kWh for the 4 kg sample, with a Specific Energy Consumption (SEC) of 7.223 kWh/kg.water and a COP of 5.4. The energy efficiency peaked at 10.80%, achieved by incorporating TES. The results demonstrate that TES improves COP and reduces the specific energy demand, leading to a more energy-efficient drying process.
Perancangan Sistem Air blast freezing Berkapasitas 25 Kg dengan Sistem Refrigerasi Cascade Menggunakan Refrigerant R290/R32 Martin, Awaludin; Sihombing, Tikkos; Rizqullah, Ibnu; Auliaswan, Fayzil; Mainil, Rahmat Iman
TURBO [Tulisan Riset Berbasis Online] Vol 14, No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4399

Abstract

Indonesia is a country rich in marine catch, especially shrimp commodities, with a production volume reaching 1.12 million tons, but only 220 thousand tons or approximately 19.64%, are exported. One contributing factor to the low export rate is poor temperature control throughout the cold chain supply process. The aim of this study to design and develop an air blast freezing system with a capacity of 25 kg, and to compare the design results with experimental data. The main focus of the research is to increase the cooling system’s capacity to meet the demands of the cold chain in the storage of marine catch, while maintaining product temperatures consistently between -18 °C and -25 °C. The design results for the low-temperature cycle (LTC) yielded evaporator load of 788.66 W, compressor power of 221.78 W, condenser load of 1317.64 W, and an evaporator surface area of 4.84 m². For the high-temperature cycle (HTC), the evaporator load was 1499.76 W, compressor power was 159.61 W, condenser load was 948.27 W, and condenser surface area was 8.98 m². Experimental tests showed that the system was able to reach product temperatures between -19.6 °C and -25.3 °C, with a design COP of 2.014 and an actual COP of 2.413 for the cascade system
Perancangan Freeze Vacuum Drying Menggunakan Thermal Energy Storage untuk Mengeringkan Lidah Buaya dengan Kapasitas 4 kg Martin, Awaludin; Cahyati, Wulan; Adriyandy, Warits; Mainil, Rahmat Iman
TURBO [Tulisan Riset Berbasis Online] Vol 14, No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4398

Abstract

Freeze vacuum drying is known as the best drying method in maintaining the nutritional quality and physical appearance of the product. However, this method has the disadvantages of a slow drying rate and high energy consumption. This study aims to improve the efficiency of the drying process by utilizing waste heat from the condenser using a thermal energy storage system using Phase Change Material (PCM) in the form of paraffin wax. This study uses a system design method that is continued to the testing stage with the results of the design of the tube diameter used, namely 0.00953 m, then the evaporator dimensions are obtained with a pipe length of 23 m, and the evaporator surface area is 7.13 x 10-5 m2. For the condenser, the pipe length is 15.9 m, and the condenser heat transfer area is 0.4762 m2. Energy consumption for drying 4 kg of aloe vera using Thermal Energy Storage (TES) is 8.937 kWh, with a design Coefficient of Performance (COP) value of 3.8 and an actual COP of 2.5.
Pengaruh katalis bentonit terhadap produksi minyak pada pirolisis sampah plastik low density polyethylene Mainil, Rahmat Iman; aziz, azridjal; Banjarnahor, Syahdi Fahala
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/hn999r48

Abstract

Pyrolysis is the heating of plastic waste at high temperatures with or without oxygen, producing oil, gas, and carbon residue. The use of catalysts in the pyrolysis process can accelerate the conversion of plastics, resulting in better-quality oil. This study aims to examine the potential of oil produced from the pyrolysis of Low-Density Polyethylene (LDPE) plastic with the addition of bentonite clay catalyst as an alternative fuel. The pyrolysis process was carried out experimentally at a temperature of 450 °C with a residence time of 60 minutes, and variations of catalyst composition of 0%, 5%, 10%, 15%, and 20% were tested to obtain the optimum condition. The composition that produced the highest oil yield was then tested at lower temperatures of 350°C and 400 °C with the same residence time. The optimum composition of bentonite clay catalyst was 15% at 450 °C. Without the catalyst (0% composition), the oil yield was 54.2%, which increased to 66% from a total feedstock of 500 g, and when compared to the plastic mass of 425 g, the oil yield reached 82.5%. The density of the oil was 0.766 g/ml, the viscosity was 1.53 cP, and the calorific value was 11302.33 cal/g. LDPE pyrolysis oil with bentonite clay catalyst showed characteristics closer to diesel fuel and kerosene. Thus, LDPE pyrolysis oil has the potential to be used as an alternative substitute for diesel fuel in energy applications.
Kaji performa mesin refrigerasi siklus kompresi uap dengan refrigeran R134a dan refrigeran hidrokarbon sebagai drop-in substitute pada dengan alat ekspansi berbeda Aziz, Azridjal; Parija, Iqbal; Mainil, Rahmat Iman
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/d8day211

Abstract

Refrigerant is an essential working fluid in refrigeration system. However, the use of synthetic refrigerant such as R-134a is now restricted due to its high Global Warming Potential (GWP) value. As an alternative, MC-134 as hydrocarbon refrigerant offers more environmentally friendly solution. This research aims to compare the performance of R-134a and MC-134 in a vapor compression refrigeration cycle system, as well as analyze the influence of expansion devices, namely capillary pipes and Thermostatic Expansion Valves (TEV). The test results show that for R-134a, increasing the length of the capillary pipe, increases the Coefficient of Performance (COP) by 20.83% due to decrease in compression work. In contrast, for MC-134, there is  decrease in COP by 3.35%. TEV provides the best performance with an increase in refrigeration effect of 6.05% and COP of 25.07%. However, TEV is not suitable for MC-134 because the low condensing pressure inhibits the phase change to liquid. In the use of 1.25 m and 1.5 m capillary pipes, MC-134 even has a higher COP of up to 16.65% compared to R-134a. Despite this, MC-134 still shows potential as a replacement for R-134a, with 30% of the mass capable of producing twice the refrigeration effect and 7.52% lower electric current consumption.
A Review: Thermoelectric cooler application for portable beverage cooler Fuad, N; Aziz, Azridjal; Iman Mainil, Rahmat
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/94ctf896

Abstract

Thermoelectric cooler (TEC) based on the Peltier effect offers a compact, silent, and environmentally friendly portable cooling solution. It can be used to preserve perishable food, medicine on remote area with limited or no electricity. This review explores experimental and theoretical findings from studies published between 2015 and 2025, with focus on portable beverage applications. Key material advances (average ZT ≈ 1–1.4) are traced, dominant thermal management bottlenecks are identified, and emerging optimization methods including artificial intelligence-assisted design are discussed. The system coefficients of performance (COPs) reported for one-stage beverage coolers have remained modest (0.2–0.9). However, recent prototypes have demonstrated the capability to achieve drink temperatures below 5 °C from 25 °C ambient within 30 minutes. These prototypes also show promising pathways for higher efficiency through hybrid photovoltaics, advanced heat sinks, and adaptive control.
Co-Authors Abd. Rasyid Syamsuri Adha, Aidil Adi Hans Purba Adriyandy, Warits Adriyus putra Afdhal Kurniawan Mainil Ahmad Surya Ahmad Wisnu Sulaiman Anggriawan, Akbar Anita Susilawati Atria Martina Aulian Samri Auliaswan, Fayzil Awaludin Martin Aziz, Azdrizal Azridjal Aziz Banjarnahor, Syahdi Fahala 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 Fuad, N 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 Parija, Iqbal Perima, Yoan Purba, Adi Hans Putra, Rio Ahmad Juliansyah Rahman Asfaranda Renaldi Khaesar Kumara Renhard Niptro G, Renhard Niptro Renhard Niptro Gultom Ridwan Abdurrahman Rizqullah, Ibnu Ruben Siregar Saberina Hasibuan Sarwo Fikri Sayfri Syafri Sihombing, Tikkos Solly Aryza Suprayitno Suprayitno Surya, Ahmad Syafri ' Teguh Irawan Thalal, Thalal Tio Vani Nesri Utari Prayetno Wandi Wahyudi Yandra, Vicky Yoan Perima Yovan Witanto