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Mokh. Hairul Bahri
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Electrical & Electronics Engineering Engineering Mechanical Engineering

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Pengaruh Jenis Katalis Heterogen Terhadap Nilai Kalor Dari Minyak Jelantah Melalui Proses Transesterifikasi Gusti Zakariya Gofururrohim; Asroful Abidin; Mokh. Hairul Bahri
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 2 (2026): Juli: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i2.6373

Abstract

Pelmanfaatan elnelrgi telrbarukan melnjadi selmakin pelnting seliring delngan melnipisnya cadangan bahan bakar fosil dan melningkatnya dampak pelncelmaran lingkungan. Biodielsell melrupakan salah satu sumbelr elnelrgi altelrnatif yang potelnsial karelna dapat dipelrolelh dari minyak nabati maupun limbah minyak, belrsifat ramah lingkungan, selrta belrkellanjutan. Pelnellitian ini belrtujuan untuk melngkaji pelngaruh pelnggunaan katalis heltelrogeln belrbasis biomassa telrhadap nilai kalor biodielsell yang diproduksi dari minyak jellantah mellalui relaksi transelstelrifikasi. Katalis yang digunakan telrdiri dari daun pelpaya, kalsium oksida (CaO) hasil kalsinasi cangkang tellur, dan karbon aktif yang belrasal dari selkam padi. Prosels transelstelrifikasi dilakukan delngan melnggunakan meltanol pada rasio meltanol telrhadap minyak selbelsar 8:1 selrta konselntrasi katalis 4% dari massa minyak, delngan suhu relaksi dijaga pada 60°C. Biodielsell yang dihasilkan kelmudian diuji karaktelristik elnelrginya mellalui pelngukuran nilai kalor melnggunakan bomb kalorimeltelr. Hasil pelnellitian melnunjukkan bahwa pelrbeldaan jelnis katalis melmbelrikan pelngaruh yang signifikan telrhadap nilai kalor biodielsell. Katalis belrbasis selkam padi melnghasilkan nilai kalor telrtinggi selbelsar 922,28 Cal/gram, seldangkan katalis dari cangkang tellur dan daun pelpaya melnghasilkan nilai kalor yang lelbih relndah, masing-masing selbelsar –99,6 Cal/gram dan –146,24 Cal/gram. Telmuan ini melnelgaskan bahwa sifat matelrial katalis belrpelran pelnting dalam melnelntukan kualitas elnelrgi biodielsell, selhingga selkam padi belrpotelnsi dikelmbangkan selbagai katalis heltelrogeln altelrnatif yang elfisieln dan ramah lingkungan.
Pengaruh Tinggi dan Berat Badan Pengemudi terhadap Kenyamanan Ergonomi Mobil Listrik 2 KW Barata Berdasarkan Metode RULA Andre Setiawan; Asroful Abidin; Mokh. Hairul Bahri
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 2 (2026): Juli: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i2.7430

Abstract

The BARATA 2 kW electric car is a compact electric vehicle developed to support energy efficiency and research activities. The limited cabin space in this vehicle has the potential to affect driver comfort due to differences in anthropometric characteristics, particularly height and weight. This study aims to analyze the influence of driver height and weight on ergonomic comfort in the 2 kW BARATA electric car using the Rapid Upper Limb Assessment (RULA) method. The study involved 30 participants, with data collected on height, weight, elbow angle, and knee angle. The anthropometric data were used to model the driver’s posture in CATIA V5 software, followed by an ergonomic analysis using the RULA method and statistical testing using SPSS. The results showed that 80% of the respondents obtained RULA scores in the 3–4 range, which falls into the category requiring further investigation, while 20% of the respondents obtained scores of 5–6, indicating the need for posture improvement. Partial test results showed that height did not have a significant effect on the RULA score with a significance value of 0.815, while body weight had a significant effect with a significance value of 0.000. In addition, the results of the simultaneous test indicate that height and weight together have a significant effect on the driver’s ergonomic comfort. Thus, the cabin design of the 2 kW BARATA electric car has been able to accommodate most drivers, but still requires refinement to improve the user’s ergonomic comfort
Pengaruh Produksi Bioetanol Melalui Fermentasi Oleh Ampas Tebu Dengan Variasi Penambahan Ragi Terhadap Nilai Kalor Dan Kadar Bioetanol A.Wahid Al Farisi; Asroful Abidin; Mokh. Hairul Bahri
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 2 (2026): Juli: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i2.7489

Abstract

The increasing energy demand and depleting fossil fuel reserves drive the development of eco-friendly alternative energy sources, such as bioethanol. Sugarcane bagasse, an agro-industrial waste with high lignocellulosic content, holds great potential for processing into bioethanol feedstock. Therefore, this study was conducted to examine the impact of varying dosages of Saccharomyces cerevisiae yeast on bioethanol production from sugarcane bagasse through fermentation, while also determining the most effective dosage. This research employed a laboratory experimental method utilizing three yeast dosage variations: 5 grams, 10 grams, and 15 grams. The fermentation process was carried out for 10 days, followed by four stages of distillation. The evaluation focused on four main parameters: moisture content, yield, bioethanol concentration, and calorific value. Based on the experimental results, oven-drying effectively reduced the moisture content of the sugarcane bagasse from 72% to 28%. Furthermore, it was found that an increase in yeast quantity was directly proportional to the concentration of the resulting bioethanol. The optimum result was achieved using 15 grams of yeast, which yielded a bioethanol concentration of up to 94% after the fourth distillation and recorded the highest calorific value at 2187.19 Cal/gram. In conclusion, increasing the yeast mass optimizes the fermentation process, thereby producing higher bioethanol concentrations and calorific values. This confirms that sugarcane bagasse holds great promise as a sustainable and eco-friendly feedstock for bioethanol production
Pengaruh Variasi Konsentrasi Zeolit Alam Terhadap Karakteristik Minyak Hasil Pirolisis Campuran Plastik Polypropylene (PP) Dan Serbuk Kulit Durian Rega Andreawan Ari Wahyudi Arto; Mokh. Hairul Bahri; Asroful Abidin
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 2 (2026): Juli: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i2.7529

Abstract

The increasing accumulation of polypropylene (PP) plastic waste and durian peel waste has become an environmental concern that requires effective and sustainable management strategies. One promising approach is the conversion of these wastes into liquid fuel through the pyrolysis process. This study aims to investigate the effect of natural zeolite addition on the quality of pyrolysis oil produced from a mixture of PP plastic waste and durian peel powder. The study is based on the principles of pyrolysis, PP plastic depolymerization, the role of biomass in co-pyrolysis, and the function of natural zeolite as a catalyst for hydrocarbon cracking. An experimental laboratory method was employed using a batch-type pyrolysis reactor operated at 400°C for 60 minutes. Natural zeolite concentrations of 5%, 10%, and 15% were applied, while the amount of durian peel powder was maintained at 5 grams for each sample. The parameters analyzed included pyrolysis oil yield, density, viscosity, and calorific value. The results showed that the addition of natural zeolite increased oil production, with the highest yield reaching 375 mL in sample D3. The highest density was obtained in sample D4 at 9.021 g/mL, while the highest viscosity and calorific value were achieved by sample D5 at 0.38 mm²/s and 5,277.01 cal/g, respectively. These findings indicate that natural zeolite significantly influences the characteristics of pyrolysis oil, with a 15% zeolite concentration providing the best energy quality based on the calorific value obtained
Analisis Pengaruh Variasi Suhu Pirolisis Terhadap Rendemen, Nilai Kalor, dan Densitas Bahan Bakar Cair dari Limbah Plastik Polypropylene (PP) Yudha Aditya Pratama; Asroful Abidin; Mokh. Hairul Bahri
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 2 (2026): Juli: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i2.7612

Abstract

The increasing amount of polypropylene (PP) plastic waste has become an environmental challenge that requires effective management. One promising technology to address this issue is pyrolysis, a thermal decomposition process carried out in the absence of oxygen that converts plastic waste into valuable liquid fuel. This study aimed to analyze the effect of pyrolysis temperature on the yield, calorific value, and density of liquid fuel produced from polypropylene plastic waste. The pyrolysis process was conducted using a batch reactor with a feedstock mass of 1.25 kg for 60 minutes at temperatures of 300°C, 400°C, and 500°C. The calorific value was determined using a Bomb Calorimeter, while the density was measured using the pycnometer method. The results showed that pyrolysis temperature significantly influenced the characteristics of the liquid fuel produced. The highest calorific value was obtained at 300°C, reaching 38,022.85 J/g (9,087.68 cal/g), which decreased to 33,538.23 J/g (8,015.83 cal/g) at 400°C and further declined to the lowest value of 3,798.05 J/g (907.76 cal/g) at 500°C. Meanwhile, the density values obtained at 300°C, 400°C, and 500°C were 1.028 g/mL, 1.011 g/mL, and 1.031 g/mL, respectively. Based on these findings, a pyrolysis temperature of 300°C produced the highest-quality liquid fuel in terms of calorific value, whereas 400°C yielded a density that was closest to the characteristics of commercial liquid fuels
Analisis Pembakaran Biopelet Bongkol Jagung Dan Batok Kelapa Dengan Tambahan Zeolit Alam Rajif Nailul Fikri; Mokh. Hairul Bahri; Rohimatush Shofiyah
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 5 No. 3 (2025): November: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v5i3.6058

Abstract

Penelitian ini bertujuan untuk menganalisis karakteristik pembakaran biopelet yang terbuat dari campuran bongkol jagung dan batok kelapa dengan penambahan zeolit alam. Metode yang digunakan adalah eksperimen laboratorium dengan variasi komposisi zeolit alam (15 g dan 20 g) dan metode karbonisasi (torefraksi 200°C dan pirolisis 450°C). Biopelet dicetak dengan ukuran diameter 10 mm dan panjang 25 mm menggunakan tepung tapioka sebagai bahan perekat. Pengujian dilakukan terhadap tiga parameter utama: kadar air, nilai kalor, dan laju pembakaran. Hasil penelitian menunjukkan bahwa sampel CT1 (torefraksi, zeolit 15 g) menghasilkan kadar air terendah sebesar 10% dan nilai kalor 2907.57 kal/g, sedangkan sampel CP1 (pirolisis, zeolit 15 g) menghasilkan nilai kalor tertinggi sebesar 4047.80 kal/g. Pada uji laju pembakaran, sampel CP1 memiliki laju pembakaran tercepat (0,06 g/detik) dengan waktu pembakaran 1,03 menit. Semakin tinggi komposisi zeolit, nilai kalor cenderung menurun, namun penambahan zeolit dan variasi metode karbonisasi terbukti mempengaruhi kinerja pembakaran biopelet. Kesimpulan dari penelitian ini adalah kombinasi bongkol jagung dan batok kelapa dengan penambahan zeolit alam serta perlakuan pirolisis dapat menghasilkan biopelet dengan kualitas pembakaran yang baik. Biopelet ini berpotensi sebagai sumber energi terbarukan yang ramBiopelet, Bongkol Jagung, Batok Kelapa, Zeolit Alam, Nilai Kalor, Laju Pembakaranah lingkungan dan dapat mengurangi limbah pertanian.
PENGARUH JENIS MINYAK NABATI TERHADAP NILAI KALOR BIODIESEL HASIL TRANSESTERIFIKASI DENGAN KATALIS KOH Aan Candra Ajis, Aan Candra Ajis; Asroful Abidin; Mokh. Hairul Bahri
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 5 No. 3 (2025): November: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v5i3.6234

Abstract

The research utilizes three types of oil, namely used cooking oil, candlenut oil, and olive oil, which were selected due to their availability and potential as biodiesel feedstocks. The main issue addressed in this study is the high dependence on fossil fuels and the need for renewable energy sources with sufficient energy content. This research aims to compare the calorific values of biodiesel produced from different vegetable oils to determine their potential as alternative fuels. Biodiesel was produced through a transesterification process using methanol with a methanol-to-oil ratio of 6:1 and 1% KOH catalyst by weight of oil. The calorific value of the biodiesel was measured using a bomb calorimeter. The results show that biodiesel derived from candlenut oil has the highest calorific value of 8037.07 Cal/gram, followed by biodiesel from used cooking oil at 7399.07 Cal/gram, while biodiesel from olive oil has the lowest calorific value of 7295.15 Cal/gram. These results indicate that the type of vegetable oil significantly influences the calorific value of biodiesel. In conclusion, candlenut oil has the greatest potential as a biodiesel feedstock based on its higher energy content compared to used cooking oil and olive oil.
Pengaruh Jenis Katalis Heterogen Terhadap Nilai Kalor Dari Minyak Jelantah Melalui Proses Transesterifikasi Gusti Zakariya Gofururrohim; Asroful Abidin; Mokh. Hairul Bahri
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 5 No. 3 (2025): November: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v5i3.6366

Abstract

Thel delpleltion of fossil fuell relsourcels and increlasing elnvironmelntal issuels havel intelnsifield thel neleld for sustainablel relnelwablel elnelrgy altelrnativels. Biodielsell has elmelrgeld as a promising substitutel fuell duel to its relnelwablel naturel, elnvironmelntal compatibility, and its production from velgeltablel oils and wastel cooking oil. This study invelstigatels thel influelncel of biomass-baseld heltelrogelnelous catalysts on thel calorific valuel of biodielsell delriveld from wastel cooking oil through a transelstelrification relaction. Thel heltelrogelnelous catalysts elxamineld includel papaya lelavels, calcium oxidel (CaO) obtaineld from calcineld elggshellls, and activateld carbon produceld from ricel husk. Thel transelstelrification procelss was conducteld using melthanol with a melthanol-to-oil ratio of 8:1 and a catalyst loading of 4% by welight of oil at a relaction telmpelraturel of 60°C. Thel produceld biodielsell was subselquelntly elvaluateld for its elnelrgy charactelristics by melasuring thel calorific valuel using a bomb calorimeltelr. Thel relsults delmonstratel that thel typel of heltelrogelnelous catalyst significantly affelcts thel calorific valuel of biodielsell. Thel ricel husk-baseld catalyst elxhibiteld thel highelst calorific valuel of 922.28 Cal/gram, whilel thel elggshelll- and papaya lelaf-baseld catalysts relsulteld in lowelr calorific valuels of –99.6 Cal/gram and –146.24 Cal/gram, relspelctivelly. Thelsel findings indicatel that thel physicochelmical propelrtiels of thel catalysts play a crucial rolel in deltelrmining biodielsell elnelrgy pelrformancel. Ovelrall, ricel husk shows strong potelntial as an elfficielnt, low-cost, and elnvironmelntally frielndly heltelrogelnelous catalyst for sustainablel biodielsell production.
Pengaruh Penambahan Katalis Zeolit Pada Proses Pirolisis Bubble Wrap Terhadap Densitas Dan Hasil Minyak Zidane Alisyah Arief; Mokh. Hairul Bahri; Asroful Abidin
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 1 (2026): Maret
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i1.6835

Abstract

Limbah plastik bubble wrap berbahan Low-Density Polyethylene (LDPE) merupakan limbah yang sulit terurai dan berpotensi mencemari lingkungan. Pirolisis menjadi salah satu metode yang efektif untuk mengonversi limbah plastik menjadi bahan bakar cair. Penelitian ini bertujuan untuk menganalisis pengaruh penambahan katalis zeolit alam (clinoptilolite) terhadap densitas minyak hasil pirolisis limbah bubble wrap. Proses pirolisis dilakukan pada temperatur 350–400 °C dengan variasi katalis sebesar 0%, 5%, 10%, dan 15%. Produk cair yang dihasilkan kemudian diuji densitasnya menggunakan metode piknometer. Hasil penelitian menunjukkan bahwa penambahan katalis zeolit berpengaruh terhadap nilai densitas minyak pirolisis. Densitas tertinggi diperoleh pada penggunaan katalis 5% sebesar 0,9241 g/ml. Pada variasi katalis 10% densitas menurun, sedangkan pada katalis 15% densitas kembali meningkat. Hasil ini menunjukkan bahwa konsentrasi katalis tidak selalu berbanding lurus dengan peningkatan densitas minyak. Secara keseluruhan, katalis zeolit 5% merupakan kondisi optimal dalam penelitian ini.
Pengaruh Variasi Zeolit Clinoptilolite pada Pirolisis Limbah Plastik PP dan PE terhadap Karakteristik Minyak serta Nilai Kalor dan Viskositas Ziddan Al Fachry; Mokh. Hairul Bahri; Nanang Saiful Rizal
Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer Vol. 6 No. 2 (2026): Juli: Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/juritek.v6i2.7530

Abstract

The increasing generation of plastic waste has become a significant environmental concern due to its resistance to natural degradation and its potential to cause long-term pollution. Pyrolysis offers a promising approach for converting plastic waste into valuable liquid fuels while reducing environmental burdens. This study investigates the effect of clinoptilolite zeolite catalyst concentration on the characteristics of pyrolysis oil derived from mixed Polypropylene (PP) and Polyethylene (PE-HDPE) plastic waste. An experimental method was employed using catalyst concentrations of 0%, 5%, 10%, and 15% under a pyrolysis temperature of 550°C for 2 hours. The resulting liquid products were evaluated based on their calorific value and kinematic viscosity. The results demonstrated that catalyst addition significantly influenced fuel quality. The highest calorific value was obtained at a catalyst concentration of 5%, reaching 11,521.45 cal g⁻¹, indicating enhanced energy content compared to other treatments. Meanwhile, calorific values at catalyst concentrations of 0%, 10%, and 15% were 9,865.55 cal g⁻¹, 10,618.11 cal g⁻¹, and 9,377.89 cal g⁻¹, respectively. Increasing catalyst concentration also reduced the viscosity of the pyrolysis oil, from 1.215 mm² s⁻¹ at 0% catalyst to 0.652 mm² s⁻¹ at 15% catalyst, suggesting more effective cracking of long-chain hydrocarbons into lighter fractions. The viscosity value closest to the commercial gasoline standard was achieved at a catalyst concentration of 10% (0.790 mm² s⁻¹). Overall, clinoptilolite zeolite proved effective in improving the physicochemical properties of pyrolysis oil, with a 5% catalyst concentration providing the most favorable performance in terms of energy content. These findings highlight the potential of catalytic pyrolysis as a sustainable strategy for plastic waste valorization and alternative fuel production
Co-Authors A.Wahid Al Farisi Aan Candra Ajis, Aan Candra Ajis Andre Setiawan Asroful Abidin Gusti Zakariya Gofururrohim M.Rizqi Rosyadi Ahlis Suddin Nanang Saiful Rizal Rajif Nailul Fikri Rega Andreawan Ari Wahyudi Arto Shofiyah, Rohimatush Yudha Aditya Pratama Zidane Alisyah Arief Ziddan Al Fachry