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Ahmad Lubi
Universitas Negeri Jakarta, Indonesia
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mechanical Engineering

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Experimental Investigation of Using Thermoelectric Coolers under Different Cooling Methods as An Alternative Air Conditioning System for Car Cabin Ragil Sukarno; Agung Premono; Yohanes Gunawan; Apri Wiyono; Ahmad Lubi
Automotive Experiences Vol. 7 No. 2 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.11485

Abstract

The cabin car temperature will increase when parked in direct sunlight, so the energy required to cool cabin space by the air conditioner will be higher. This study aims to investigate using a thermoelectric cooling system as an alternative to a chiller system to supply cold air to the car cabin under different cooling methods for parked cars. Experimental testing of thermoelectric cooling systems was conducted to produce cold air that can be applied to car cabins as an alternative to conventional air conditioners. The thermoelectric cooling system was varied with single and double TEC modules. The double TEC modules are arranged in a series of electrical and parallel thermal arrangements. A cooling water block using a mixture of water and ethylene glycol with variations of 0.4 lpm, 0.5 lpm, and 0.6 lpm was added to the hot side of the thermoelectric module. The result shows that the thermoelectric cooling system can work properly during the 2-hour test, which constantly supplies air to the cabin space between 20-25 °C, depending on the configuration of the cooling system. The highest COP of 0.84 was obtained when using the double TEC with heatsink and added 0.5 lpm water cooling system, while the lowest COP of 0.53 was obtained when using the single TEC module without a cooling water block.
Distillation, Characterizations, and Testing of Distillation Products from Waste Lubricant Oil (WLO) using Compression-Ignition Engine Sugeng Priyanto; Ahmad Lubi; Ferry Budhi Susetyo; Danar Hari Krisyono; Sigit Dwi Yudanto; Fakhrony Sholahudin Rohman; Sudibyo Sudibyo
Automotive Experiences Vol. 7 No. 3 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.11497

Abstract

Waste lubricant oil is always found in motor vehicle repair shops. Utilizing waste lubricant oil by distilling it will provide benefits. For this reason, waste lubricant oil was distilled in this research. Several characterizations were conducted to determine the viscosity, density, low heat value (LHV), and flash point of waste lubricant oil and distillation products. The distillation product is less viscous, denser, LHV, and flash point than lubricant oil waste. The distillation product was mixed with Pertamina DEX (0, 5, 10, and 15 vol.%) and then filled into the fuel tank for the engine performance test. The present experiment utilized a compression-ignition (CI) engine to measure performance. CI engine speed variations were carried out at 1000, 1500, 2000, and 2500 to see the influence of the mixed fuel on torque, power, specific fuel consumption (SFC), thermal efficiency, and smoke opacity. The increase in CI engine speed leads to an increase in torque, power, thermal efficiency, and smoke opacity, but at the same time, SFC decreases to 2500 rpm. Increasing the distillation product content in the mixed fuel decreased torque, power, SFC, thermal efficiency, and increased smoke opacity.
Synthesis and Characterization of Hybrid Teak Wood/Water Hyacinth Reinforced Polyester Composites for Eco-Friendly Motorcycle-Brake Pad Application Ferry Budhi Susetyo; Rani Anggrainy; Ahmad Lubi; Ahmad Mashuri Sahid; Ahmad Fathurahman; Fitri Kurniawati; Nora'aini Ali; Jan Setiawan
Automotive Experiences Vol. 8 No. 3 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.14627

Abstract

Non-asbestos materials are developed to replace asbestos as brake pad due to the dangers to human health. Therefore, this study aimed to explore the development of hybrid reinforced polyester composites using natural fibers such as teak wood and water hyacinth for brake pad application. Natural fibers were prepared by drying, cutting, and filtering through a 30-mesh sieve. The quantity of polyester/catalyst resin was fixed at 30 g, while teak wood and water hyacinth fibers were varied (15, 10, and 5 g). Fillers and composites were investigated using Fourier transform infrared (FTIR) and composites were further analyzed through scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), thermogravimetric analysis-differential scanning calorimetry (TGA-DSC), hardness, and wear resistance testing. The results of FTIR spectra showed that a 5TW-15WH sample had the lowest lignin content, while surface morphology of composites was inhomogeneous with few voids and cracks. Based on EDS investigation, carbon (C) and oxygen (O) were the two most abundant elements, indicating lignin, cellulose, and hemicellulose as the main components in composites. TGA measurement showed that 15TW-5WH sample had lower weight loss compared to others. Increasing water hyacinth caused a significant improvement in material performance, with 5 g teak wood-15 g water hyacinth in the composite, showing the highest hardness at 71.2 Shore D and lowest wear rate of 5.373 × 10-6 mm2/kg.
Co-Authors Agung Premono Ahmad Fathurahman Ahmad Mashuri Sahid Anggrainy, Rani Apri Wiyono Danar Hari Krisyono Fakhrony Sholahudin Rohman Ferry Budhi Susetyo Fitri Kurniawati Jan Setiawan Nora'aini Ali Ragil Sukarno Sigit Dwi Yudanto Sudibyo Sudibyo Sugeng Priyanto Yohanes Gunawan