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All Journal Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) Science and Technology Indonesia Automotive Experiences
Lubi, Ahmad
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Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics

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

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.
Carbon Micron-size Content Dependency in Epoxy/Carbon Composite Coated onto SPCC Plate for Automotive Bodies Protection Anggrainy, Rani; Susetyo, Ferry Budhi; Lubi, Ahmad; Yudanto, Sigit Dwi; Rosyidan, Cahaya; Soegijono, Bambang; Ajiriyanto, Maman Kartaman; Kurniawan, Ova; Nanto, Dwi
Science and Technology Indonesia Vol. 9 No. 4 (2024): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.4.989-998

Abstract

Conventional epoxy coating for surface metal corrosion protection reported many unsolved technical problems. Adding filler in the epoxy could enhance the promising properties of the composite coating. Our work describes in detail the synthesizing and characterizing epoxy/carbon composite coating. Epoxy was mixed with thinner high gloss (HG) and hardener and stirred using a stirrer apparatus. After blending, various carbons were added (1 wt. %, 3 wt. %, and 5 wt. %) and then appropriately stirred. The different mixture composite was coated onto the steel plate cold rolled coiled (SPCC) plate using high-volume low-pressure (HVLP) in two passes. Various characterizations were performed, including crystallographic orientation, Infra-Red (IR)-spectra, surface morphology, thickness, hydrophobicity, hardness, and corrosion using X-ray diffraction (XRD), Fourier transform infrared (FTIR), Scanning electron microscopy (SEM), portable dry film coating thickness (DFT), digital camera, Vickers microhardness tester, and Potentiostat, respectively. More carbon micron-sized content led to elevate the peak intensity, surface bumpiness, and hydrophobicity. The uppermost external bumpiness and hydrophobicity values are 23.51 µm and 101◦. Hardness depends on carbon content and more carbon leads to an increase in the hardness of the composited coating. The highest average Vickers hardness value is 28.24 HV. The coating thickness influenced the corrosion rate, more coating thickness promoted lesser corrosion rate. The highest coating thickness (60.8 µm) promoted a corrosion rate of around 5.65×10−4 mmpy.
APPLICATION OF JIGSAW-TYPE COOPERATIVE LEARNING MODEL TO IMPROVE LEARNING OUTCOMES Anggrainy, Rani; Tresdiawan, Rendi Ardi; Mubarak, Ibnu; Sutia, Iyep; Lubi, Ahmad
Journal of Mechanical Engineering Education (Jurnal Pendidikan Teknik Mesin) Vol 9, No 2 (2022): Desember 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jmee.v10i2.52725

Abstract

This study aims to (1) find out the difference in improving student learning outcomes between those who use the jigsaw-type cooperative model and students who use the lecture model, and (2) find out the increase in student learning outcomes   after applying the cooperative learning model with jigsaw type. Metode penelitian yang digunakan adalah metode eksperimental. The experimental method is used to look for a causal relationship between two factors that the researcher deliberately caused. The population in this study was all Class XI students majoring in Motorcycle Business Engineering at one of the State Vocational Schools in Bandung totaling 5 classes. The research samples were taken in two classes, namely one experimental class and one control class, the sampling technique was carried out random sampling cluster. The instruments used are test instruments and obsrvation sheets. The results showed that there was a significant difference between the learning outcomes of students who used a jigsaw-type cooperative model and students who got learning with a lecture model. The average final score of learners using the jigsaw-type cooperative model was higher than those using lectures. The N-Gain value index of the jigsaw type cooperative model category is quite effective and the lecture model of its N-Gain index category is ineffective.Keywords: Learning Model; cooperative; jigsaw; Experimental; N-Gain
Co-Authors Anggrainy, Rani Apri Wiyono Bambang Soegijono Cahaya Rosyidan, Cahaya Dwi Nanto, Dwi Ferry Budhi Susetyo Ibnu Mubarak Kurniawan, Ova Maman Kartaman Ajiriyanto Premono, Agung Sukarno, Ragil Sutia, Iyep Tresdiawan, Rendi Ardi Yohanes Gunawan, Yohanes Yudanto, Sigit Dwi