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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Sinergi Jurnal Teknik Mesin JMPM (Jurnal Material dan Proses Manufaktur) Warta Ardhia : Jurnal Perhubungan Udara BIOEDUSAINS: Jurnal Pendidikan Biologi dan Sains Jurnal Kelautan Nasional Food Science and Technology Journal (Foodscitech) G-Tech : Jurnal Teknologi Terapan International Journal of Advanced Technology in Mechanical, Mechatronics and Material (IJATEC) JTAM ROTARY Journal of Integrated and Advanced Engineering (JIAE) Jurnal Pengabdian Masyarakat : Pemberdayaan, Inovasi dan Perubahan International Journal of Innovation in Mechanical Engineering and Advanced Materials J-ENSITEC (Journal of Engineering and Sustainable Technology) JCSE: Journal of Community Service and Empowerment Jipmas : Journal Inovasi Pengabdian Masyarakat
Nanang Ruhyat
Universitas Mercu Buana
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CFD Study on Wire Mesh Inserts Enhancing Heat Transfer in Double Pipe Heat Exchanger Parely, Rizky Nanda; Ruhyat, Nanang
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 9 No. 1 (2025): June
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v9i1.27332

Abstract

The efficiency of heat transfer in conventional double pipe heat exchangers (DPHE) was often limited by low heat transfer coefficients. This posed a challenge for compact-scale industrial applications requiring enhanced thermal performance without increasing system dimensions. One potential solution was the insertion of wire mesh inside the pipe to induce local turbulence and intensify forced convection. This study was conducted numerically using Computational Fluid Dynamics (CFD) in ANSYS Fluent 2024 R2. The DPHE consisted of concentric copper pipes with a length of 1240 mm, inner pipe diameter of 26/34 mm, and outer pipe diameter of 68/76 mm. Water was used as the working fluid in counterflow mode, with inlet hot water at 70 °C (Re 4000–16000) and cold water at 31 °C (Re 2000). The parameters varied were wire mesh angle (30°, 60°, 90°), wire spacing (3 mm, 4 mm, 5 mm), and mesh spacing (4 cm, 5 cm, 6 cm), arranged using an L9 orthogonal array. Three-way ANOVA and Tukey HSD test were applied to identify significant effects. The configuration of 30°, 3 mm, and 4 cm was found to be the most optimal, yielding a 34.55% increase in heat transfer compared to the plain DPHE.
COMPARISON OF THE DRYER AIR INLET POSITION ON THE SPRAY DRYER WITH A DOUBLE CONDENSER TO PRODUCE A ROTATING FLOW THROUGHOUT THE DRYING CHAMBER: CFD ANALYSIS Nanang Ruhyat
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 5 No. 1 (2023)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v5i1.21605

Abstract

Simulation of the drying air and the spray of liquid in the spray dryer chamber with Discrete Phase Material (DPM) and Discrete Random Walk (DRW) was presented in this study using CFD methods to analyze the drying liquid. The main problem in spray drying is the adhesion of the material to the drying chamber walls, which causes uneven drying material. This adhesion can slow down the drying process and reduce productivity. The design of the drying air inlet into the drying chamber becomes essential to research. Variations in the position of the drying air inlet into the drying chamber are carried out in the 3D spray dryer room to see the mechanism of the centrifugal velocity of the drying airflow, which can improve uniform mixing with flow resistance due to friction with small walls and the drying air velocity. This phenomenon is impossible to observe in experiments. A geometric model consisting of 1,054,000 hexa-mesh elements at the area around the nozzle, the top spot of the chamber and the remaining area covered with a tetrahedral mesh, was determined to predict velocity, temperature, and fluid flow behavior. The first position, the dryer air inlet, is at an angle from the diameter of the spray drying chamber. The second position is in the middle of the diameter of the drying chamber. The position of the first inlet produces a more even temperature contour with a more tangential velocity due to the small frictional resistance with the walls. At the same time, the second position is not recommended because the flow leads to one side of the wall and creates sticking and even material buildup. A double-heated condenser can dry air at moderate temperatures, and it is a very effective drying product— positioning the dryer air inlet into the drying chamber, achieving the economical production of high-quality products.
Performance Evaluation of a Condenser at a Combined Cycle Power Plant Using the LMTD Method Putut Jaya Swardhamana; Nanang Ruhyat; Sentot Novianto
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 6 No. 2 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v6i2.27450

Abstract

This study evaluates the performance of the condenser at the Cilegon Combined Cycle Power Plant (CCPP) using the Logarithmic Mean Temperature Difference (LMTD) method to measure the heat transfer rate. Routine maintenance carried out on the condenser in the form of cleaning the condenser water box and condenser tube from garbage and crust on the condenser tube wall. Currently, condenser maintenance follows a routine schedule that is tied to steam turbine maintenance, without taking actual condenser performance into account. This can lead to inefficiencies and unnecessary downtime. The goal of this research is to assess the heat transfer rate of the condenser before and after maintenance to judge its effectiveness. Data on temperature changes were gathered in June 2023, before maintenance, and again in July 2023, after an overhaul. The analysis shows that the heat transfer rate increased from 51,362,294.48 kcal/h to 127,246,219.7 kcal/h, while the LMTD value rose from 0.76°C to 1.86°C. Based on these results, the study suggests a new approach to maintenance that focuses on performance. Specifically, maintenance should be done when the heat transfer rate drops below 110,000,000 kcal/h. This approach will help ensure the condenser works at its best, improve the plant's overall efficiency, and prevent the need for unnecessary maintenance. By aligning maintenance with performance data, the plant can boost output while lowering costs and downtime.
Performance Evaluation of Ammonia Refrigeration Systems in a Texturizing Plant Abdul Cholik; Nanang Ruhyat; Sentot Novianto
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 6 No. 3 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v6i3.27476

Abstract

This study evaluates the performance of an ammonia refrigeration system used as a cooling medium in a texturizing plant. The analysis was conducted over a 10-day period, focusing on key performance indicators such as compressor work, condenser exhaust heat, refrigeration effect, mass flow rate, Coefficient of Performance (COP), and overall system efficiency. The data revealed that the system performed optimally on Day 5, achieving a peak efficiency of 91%, with compressor work at 304.1 kJ/kg and condenser exhaust heat at 1414.6 kJ/kg. In contrast, the lowest efficiency was recorded on Day 3, at 77%. The refrigeration effect reached its highest value of 491.3 kJ/kg on Day 3, highlighting efficient heat absorption despite lower overall system efficiency. On Day 4, the mass flow rate was 0.001049929 kg/s, with an actual COP of 1.39, while the ideal COP peaked on Day 10 at 1.69, reflecting the system’s theoretical maximum efficiency under optimal conditions. The study emphasizes the critical role of the condenser in the system’s performance. Optimizing the condenser’s operation by controlling temperature, pressure, and flow rates, alongside regular maintenance, significantly impacts system efficiency. The findings suggest that careful monitoring of operational parameters, including compressor work and refrigerant flow, can enhance the overall efficiency and reliability of ammonia refrigeration systems in industrial settings. This research provides practical insights into improving the cooling performance, reducing energy consumption, and ensuring consistent production quality in texturizing plants.
Design and Analysis of a Vertical Axis Ocean Current Turbine Tunnel Using SolidWorks Computational Fluid Dynamics Hardi Gunawan; Nanang Ruhyat; Sentot Novianto
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 6 No. 1 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v6i1.27652

Abstract

The development of renewable energy in the marine power generation sector presents a promising approach to producing electrical energy in a sustainable and environmentally friendly manner. Indonesia, with its vast oceanic territory, holds significant potential for harnessing marine energy. However, the relatively slow speed of ocean currents in the region, typically ranging from 0.1 m/s to 1.5 m/s, poses a challenge to the efficiency of marine power generation. To overcome this limitation, this research focuses on the design and analysis of a vertical-axis ocean current turbine tunnel aimed at increasing the speed of ocean currents, thereby enhancing the overall efficiency of energy production. The study combines a thorough literature review with experimental research methods, utilizing SolidWorks Computational Fluid Dynamics (CFD) software to simulate the tunnel's impact on ocean current velocity. The simulations reveal that the tunnel construction significantly boosts current speeds, increasing them from 1.0 m/s to 1.7 m/s, and from 1.5 m/s to 2.6 m/s. This increase in velocity directly translates to higher kinetic energy available for conversion into electrical power by the turbine. Moreover, the study shows that the tunnel construction contributes to a more uniform flow of ocean currents, as evidenced by the Reynolds numbers obtained—100.250 at a current speed of 1.0 m/s and 150.375 at 1.5 m/s. These values, being below 2000, indicate laminar flow conditions within the tunnel, which are beneficial for optimizing turbine performance by reducing turbulence and ensuring a stable energy output. The findings underscore the effectiveness of the tunnel design in improving the efficiency of vertical-axis ocean current turbines, making it a viable solution for enhancing renewable energy production in regions with low ocean current speeds.
Performance Analysis of Centrifugal Pumps Before and After Wear Ring Restoration Moh Sahal Rifai; Nanang Ruhyat; Arief Surachman
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 7 No. 1 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v7i1.30324

Abstract

A pump is a mechanical device used to move fluids from a lower elevation to a higher one. In general, pumps are classified into two types: positive displacement pumps and non-positive displacement pumps. Centrifugal pumps fall into the latter category and operate by converting mechanical energy into kinetic energy to transport fluids. A centrifugal pump consists of several key components, including the casing, shaft, bearing, coupling, and impeller. In the case of closed impeller-type centrifugal pumps, wear rings (wearing components) are installed to provide a clearance between the impeller and the casing, preventing physical contact during operation. The size of this clearance significantly affects pump performance. Wear ring damage can result from mechanical wear, corrosion, cavitation, and fatigue, leading to performance losses such as reduced flow rate, lower pressure, and decreased efficiency. This research aims to analyze the effect of wear ring damage on the performance of a centrifugal pump by comparing operational data before and after repair of the wearing components. The performance parameters evaluated include pump head, pressure, hydraulic power, motor power, and overall efficiency. Data were collected through a structured procedure consisting of preparation, testing, measurement, and analysis. Prior to repair, the pump operated with a wear ring clearance of 1.2 mm, resulting in an average efficiency of 8.5% and a flow rate of 0.000646 m³/s. After the clearance was restored to 0.43 mm, the average efficiency increased to 15.5%, with a corresponding flow rate of 0.000932 m³/s. These results demonstrate that maintaining wear ring clearance within recommended standards significantly improves pump performance, highlighting the importance of regular maintenance and timely component repair.
Enhancing Homogeneity and Particle Size Reduction in Coffee–Creamer Mixtures Using Fluidized Bed Mixer Nanang Ruhyat; Erna Multahada; Alfa Firdaus Sirait
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 7 No. 1 (2025)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v7i1.31132

Abstract

This study investigates the application of a fluidized bed mixer to improve the homogeneity, particle size distribution, and moisture reduction of coffee and creamer powder mixtures. The research focuses on three types of coffee particles—Type A (145 μm), Type B (100 μm), and Type C (50 μm)—which were mixed with creamer in a weight ratio of 1:0.7. The mixing process was conducted using a prototype fluidized bed mixer with a capacity of 1,000 grams and a blower speed range of 2,800–3,000 rpm. After 10 minutes of mixing, significant reductions in particle size were observed: Type A decreased by 20–30%, Type B by 10–15%, and Type C by 5–10%, with creamer particles also experiencing a 15% reduction. Moisture content dropped from 10.63% to 8.5%, demonstrating the system’s dual function of mixing and drying. Microscopic analysis revealed a uniform particle distribution with minimal agglomeration or segregation, confirming the effectiveness of the fluidized bed mixer in achieving a homogeneous blend. These findings underscore the potential of fluidized bed technology in improving the quality, stability, and handling properties of powder-based products. The results have important implications for instant beverage production, food formulation, and broader powder processing industries, where consistent product performance is essential.
ANALISIS KINERJA SYSTEM PENDINGIN PORTABLE SEDERHANA MENGGUNAKAN MODUL PELTIER TEC1-12706 Amirul Mu'minin; Nanang Ruhyat
JTAM ROTARY Vol 8, No 1 (2026): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v8i1.16536

Abstract

Penelitian ini bertujuan untuk menganalisis kinerja sistem pendingin portable sederhana yang menggunakan modul Peltier TEC1-12706. Rancangan sistem terdiri dari heatsink, kipas, dan modul Peltier yang dirakit dalam sebuah box pendingin portable. Pengujian dilakukan dengan variasi jumlah modul Peltier (satu dan dua buah) serta perbedaan kondisi beban pendinginan. Hasil penelitian menunjukkan bahwa penurunan suhu terbesar terjadi pada penggunaan dua modul Peltier, dengan rata-rata suhu terendah mencapai 19,3°C pada menit ke-30. Koefisien performa (COP) sistem diperoleh sebesar 0,64, menunjukkan bahwa efisiensi energi sistem masih relatif rendah dibandingkan dengan sistem pendingin konvensional. Namun demikian, sistem pendingin portable ini cukup efektif dalam menurunkan suhu dan stabilitas termal terjaga pada rentang ±5°C. Penelitian ini menunjukkan bahwa sistem pendingin berbasis Peltier berpotensi diterapkan pada aplikasi portable meskipun efisiensi masih perlu ditingkatkan. This research aims to analyze the performance of a simple portable cooling system using a Peltier TEC1-12706 module. The system design consists of a heatsink, fan, and Peltier module assembled in a portable cooling box. Tests were carried out with variations in the number of Peltier modules (one and two units) and different cooling load conditions. The results showed that the largest temperature drop occurred when using two Peltier modules, with the lowest average temperature reaching 19.3°C at the 30th minute. The system coefficient of performance (COP) was 0.64, indicating that the system’s energy efficiency is still relatively low compared to conventional cooling systems. Nevertheless, this portable cooling system was effective in reducing temperature and maintaining thermal stability within a ±5°C range. This study demonstrates that Peltier-based cooling systems have potential for portable applications, although efficiency improvements are still needed.
Analisis Pembakaran Boiler Biomassa Menggunakan Biogas Pome Ahmad Romadhoni; Nanang Ruhyat
BIOEDUSAINS:Jurnal Pendidikan Biologi dan Sains Vol. 9 No. 4 (2026): BIOEDUSAINS:Jurnal Pendidikan Biologi dan Sains
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/0ehygr19

Abstract

This study aimed to analyze the utilization of biogas derived from Palm Oil Mill Effluent (POME) as an alternative fuel in a biomass boiler system at a palm oil mill. This study employed a quantitative experimental approach through direct testing on an existing boiler unit using biomass combustion and hybrid combustion involving biomass and biogas. The research stages included POME biogas characterization, burner prototype design and testing, burner integration with the boiler, and evaluation of combustion stability and solid fuel substitution. The results showed that POME biogas could be utilized as a partial substitute fuel in the biomass boiler system. The use of biogas maintained combustion stability and reduced palm fiber and shell consumption without disrupting the continuity of steam generation. Although the heating value and supply of biogas fluctuated, the combustion system remained operational through appropriate adjustment of the biogas flow rate. Based on these findings, the integrated biogas-burner-boiler system is technically feasible as a solution to improve energy utilization efficiency, optimize POME waste utilization, and reduce dependence on solid biomass fuels in the palm oil industry. Keywords: Biogas, Boiler, Fuel Substitution, Palm Oil Mill Effluent, Thermal Efficiency  
Co-Authors Abdul Cholik Agung Pramu Aji Agung Pramu Aji, Agung Pramu Ahmad Afif Ahmad Romadhoni Alexander, Baimy Alfa Firdaus Sirait Amirul Mu'minin Antonius Angga Andriawan Arief Surachman Baimy Alexander Cholik, Abdul Dedik Romahadi Desti Dorion, L. B. Dewi Murniati Dwiyoga Nugroho Engkos A. Kosasih, Engkos A. Erna Multahada Erna Multahada Faizal Fajar Anggara Fajar Yudi Prabowo Firdianto, Ade Firman Maulana Hardi Gunawan Hardi Gunawan Haris Ilman Fiqih Haris Ilman Fiqih Hariyanto Triwibowo Hilmy Nurfuad Jessi Ray Mardhatilla L. B. Desti Dorion martolis tolis jasani Michael Kirkland Ngala Moh Sahal Rifai Mohammad Ihsan Muhammad, Firhan Adji Parely, Rizky Nanda Putra, Jouvan Chandra Pratama Putut Jaya Swardhamana Rifai, Moh Sahal Sari, Wedha Sentot Novianto Sentot Novianto, Sentot Sirait, Alfa Firdaus Surachman, Arief Swardhamana, Putut Jaya Syukur Pribadi Tyas Wedhasari Utama, Tri Yoga Wahyudi Rahmat