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Peningkatan Kinerja Termoelektrik Ganda pada Mesin Pendingin Air Minum sebagai Solusi Penghematan Energi Amrullah, Amrullah; Djafar, Zuryati
Jurnal Teknologi Terapan Vol 1, No 1 (2015): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v1i1.34

Modul termoelektrik merupakan suatu alat yang bekerja untuk menghasilkan dingin dengan memanfaatkan energi listrik. Pemilihan modul ini didasarkan pada beban kalor, beda temperatur dan daya listrik yang digunakan. Termoelektrik pendingin memiliki beberapa kelebihan diantaranya tidak berisik, mudah perawatan, tidak memerlukan banyak komponen tambahan dan ramah lingkungan. Penerapan termoelektrik dengan dua tingkat atau lebih yang dikombinasikan pada mesin pendingin merupakan metode penting untuk meningkatkan kinerja termoelektrik. Pada penelitian ini akan dilakukan pengujian kinerja modul termoelektrik pendingin pada dispenser air minum dengan memanfaatkan tegangan listrik DC. Model termoelektrik yang akan diuji adalah modul ganda yang dirangkai secara seri listrik dan paralel listrik dengan meninjau temperatur air yang didinginkan, daya listrik yang digunakan termoelektrik dan kecepatan pendinginan. Hasil penelitian menunjukkan bahwa modul terbaik dari segi temperatur air, kecepatan pendinginan dan penghematan energi listrik adalah termoelektrik ganda yang dirangkai secara seri pada tegangan 10 V. Hal ini dapat dilihat setelah 360 menit dengan temperatur air yang didinginkan 12oC, beda temperatur 28oC, kalor yang diserap 19.52810 W ,dan COP 1.25268.

ANALISA KINERJA MESIN REFRIGERASI RUMAH TANGGA DENGAN VARIASI REFRIGERAN Djafar, Zuryati; Piarah, Wahyu Haryadi; Amrullah, Amrullah
Jurnal Teknologi Terapan Vol 3, No 2 (2017): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

The most important component in the refrigerator is the refrigerant. The refrigerant absorbs heat from one side and throw it to another side through the mechanism of evaporation and condensation. This research aims to develop a refrigeration machine using different refrigerants that can be observed with the performance of the compressor, evaporator performance and COP, and hoped this research can show the installation as a medium of learning in applying the working principle of refrigerator. The research method was experimental at setting 8 refrigeration machine with data collection for the pressure and temperature of R-12 and R-134a were measured at the compressor inlet and outlet for 300 minutes. Determining the value of the enthalpy at any point by using REFPROP program. The use of different refrigerants in a refrigeration machine indicates that the refrigerant R-134a better than R-12. It can be seen after 300 minutes for R-134a, compressor performance 29.4 kJ / kg, the performance of the evaporator is 144.5 kJ / kg, COP 4.9 while for R-12 compressor performance 21.8 kJ / kg, the performance of the evaporator is 12.3 kJ / kg, COP 4.6.

PENGARUH LAJU ALIRAN MASSA UDARA PANAS TERHADAP KINERJA MESIN PENGERING RAK TELUR Aziz, Nasruddin; Djafar, Zuryati; Kusumawati, Dian
Jurnal MEKANIKAL Vol 10, No 1 (2019): Jurnal Mekanikal Januari 2019
Publisher : Jurnal MEKANIKAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (515.779 KB)

Mesin pengering rak telur dengan tungku berbahan bakar sekam padi dirancang untuk membantu produsen rak telur agar terhindar dari masalah pengeringan saat musim hujan, di mana selama ini proses pengeringan dilakukan dengan metode konvensional yaitu menggunakan panas matahari. Mesin ini dirancang dengan memanfaatkan udara panas dari hasil pembakaran sekam padi kemudian diteruskan masuk pada Compact heat exchanger plate-fin 2.0 di mana udara panas tersebut bercampur dengan udara lingkungan dan masuk ke dalam oven untuk mengeringkan rak telur. Dalam penelitian ini dilakukan pengambilan data yang dilakukan yaitu data temperatur rak telur, kadar air rak telur, massa awal dan akhir rak telur dan kecepatan aliran udara dari blower udara lingkungan maupun udara panas hasil pembakaran sekam pada mesin pengering rak telur. Dengan variasi laju aliran massa udara panas yaitu 0.041 kg/s, 0.043 kg/s, 0.049 kg/s, 0.053 kg/s dan kecepatan aliran udara lingkungan yaitu 17 m/s, 18 m/s, 19 m/s, 20 m/sHasil penelitian menunjukkan bahwa laju pengeringan sangat dipengaruhi oleh variasi kecepatan aliran udara lingkungan dan laju aliran udara panas hasil pembakaran di mana kecepatan aliran udara yang optimal yaitu sekitar 19 m/s, laju aliran massa udara panas 0.049 kg/s dengan kecepatan putaran blower udara yaitu 2800 rpm baik itu untuk udara bersih maupun udara panas hasil pembakaran sekam padi. Dengan penurunan nilai kadar air setiap 15-20 menit selama proses pengeringan rak telur,besar perubahan kadar air sekitar 19%-20%. Dari keempat variasi laju aliran massa udara panas diperoleh nilai efisiensi pengeringan yang paling tinggi yaitu sebesar 36.01% untuk laju aliran massa udara panas sebesar 0,043 kg/s dan nilai efisiensi pengeringan yang paling rendah yaitu sebesar 32.87% pada laju aliran massa udara panas sebesar 0,053 kg/s.Â Â Kata Kunci : Mesin Pengering Rak Telur, Alat Penukar Kalor, Laju Aliran Massa, Laju Pengeringan.

ANALISIS PENGGUNAAN GASOHOL DARI LIMBAH KULIT PISANG TERHADAP PRESTASI MESIN MOTOR BAKAR BENSIN Piarah, Wahyu H.; Djafar, Zuryati; Mangkau, Andi
Jurnal MEKANIKAL Vol 2, No 1 (2011)
Publisher : Jurnal MEKANIKAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (244.321 KB)

Usage of type alcohol of etanol in gasoline fuel proves a number of machine achievements in terms of parameters, namely actual horsepower, specific fuel consumption, mean effective pressure and thermal efficiency compared to use pure premium fuel. Level of such repair gyrate 73% from maximum energy according to machine specification. In yielding etanol, fermentation process with yeast mixture then destiltaion. Etanol mixed with premium with certain ratio. In this research, variation of mixing of alcohol premium, namely: 95%+5%; 90%+10% and 85%+15% by 3 variation Â throttle opening: 20%, 40% and 60%. The result indicates that with usage of concentration mixing of premium + etanol, reached actual horsepower by Kijang machine 7k experiencing with maximum value equal to 17,347 kW that happened at condition of opening of throttle 60% at rotation 2100 rpm with usage of mixing 95% premium + 5% etanol. With usage of concentration mixing of premium + etanol, specific fuel consumption also experience with maximum value equal to 0,331 kg/ kWh that happened at condition of throttle opening by 20% within rotation of 2100 rpm with usage of mixing 90% premium + 10% etanol.

Mathematical Modeling in Combining Photovoltaic and Thermoelectric Generator Using a Spectrum Splitter Hariyanto Hariyanto; Mustofa Mustofa; Zuryati Djafar; Wahyu H. Piarah
EPI International Journal of Engineering Vol 2 No 1 (2019): Volume 2 Number 1, February 2019 with Special Issue on Composite Materials & Stru
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022019.13

The experimental stages of converting solar energy into electrical energy in Photovoltaic and Thermoelectric Generator (PV-TEG) hybird takes a long time. Modeling is one approach to find out the initial data before conducting experiments leading to minimize design errors, time and budget. A mathematical model is created to analyze the performance of a PV-TEG hybrid module. Modeling is performed as an electrical circuit equivalent to Kirchoff's Curent Law (KCL) by deriving several equations corresponding to the characteristics of each module. Type of PV is amorphous Silicon (a-Si), while TEG is Bismuth Telluride (Bi2Te3). The AM1.5D standard solar spectrum is splitted its wavelength spectrum using hot mirror, where the wavelengths of 400-690 nm are transmitted to PV and 690-1150 nm are reflected to TEG. All of PV-TEG hybrid parameters, for example intensity, temperature, and material property are obtained from the specification data of each module. As a results, the maximum total power is 0.0437 W with 5.1% its efficiency.

The Characterization of Thermoelectric Generator in Utilizing the Heat Waste of the Biomass Egg Drying Machine Sudarmanto Jayanegara; Zuryati Djafar; Zulkifli Djafar; Nasaruddin Azis; Wahyu Haryadi Piarah
EPI International Journal of Engineering Vol 3 No 1 (2020): Volume 3 Number 1, February 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022020.04

This research was conducted to determine the character of the TEG module as a source of electrical energy in utilizing heat in the chimney wall of an egg rack drying machine that uses rice husk as engine furnace fuel. The test is carried out by utilizing heat on 2 pieces of chimney (upper chimney and lower chimney) separated by a Heat Exchanger (HE) with a furnace blower speed of 2600 rpm and environmental blower speed of 2800 rpm with the amount of thermoelectric used as many as 44 units. The results show that the TEG module in the upper chimney obtained temperature difference (∆T), voltage difference (∆V) and power (P) respectively ∆T 38.75 ° C; ∆V 3.68 Volts; P 0.796 Watt and for the lower chimney respectively ∆T 73.25 ° C; ∆V 12.26 Volts; P 2.446 Watt.

Utilization of Gasoline Fuel as an Alternative Fuel for LPG Substitution Asril Mallombasang; Zuryati Djafar; Wahyu Haryadi Piarah
EPI International Journal of Engineering Vol 3 No 2 (2020): Volume 3 Number 2, August 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082020.08

The subsidized gasoline conversion to LPG 3 kg in 2006 became the Indonesian Government’s policy to reduce reliance on fuel oil. The increasing LPG consumption and obstacle distribution have been the scarcity of the LPG in all regions of Indonesia. The gasoline fueled stove has overcome from the LPG scarcity. The purpose of this research was to compare the use of Gasoline types Pertalite and Pertamax with the use of LPG fuel. The research method was carried out by comparing the three types of fuel in the process of boiling 1 (one) litre of water using a gas stove, with several variations in pressure from 1.5 kPa to 2.5 kPa. The results showed that the highest fire temperature for Pertalite was 430 °C fuel, Pertamax 530 °C fuel and LPG 578 °C fuel. Fuel consumption for Pertalite 0,025 kg, Pertamax 0,027 kg and LPG 0,061 kg. The boiling time is 682 s for Pertalite, 669 s Pertamax and 503 s for LPG. The least compaction efficiency value occurs at 1.5 kPa pressure, for Pertalite 6,136 %, Pertamax 7,730 % and LPG 9,018 %. The higher the pressure, the greater the maturity efficiency, instead the fuel consumption and water boiling time are reduced. The cost used to boil water at Pertalite is Rp. 236,-; Pertamax Rp. 251,- and LPG is Rp. 309,-.

Optimum Investigation LED Bulbs Light as Photon Energy on Photovoltaic Panel Installed Inside Buildings Mustofa Mustofa; Anjar Asmara; Yuli Asmi Rahman; Tutang Muhtar Kamaludin; Hariyanto Hariyanto; Zuryati Djafar; Wahyu Hariyadi Piarah
EPI International Journal of Engineering Vol 4 No 2 (2021): Volume 4 Number 2, August 2021
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/10.25042/epi-ije.082021.02

This study was conducted to obtain the angle of elevation of solar panels (PV) to harvest photon light energy sources from LED bulbs that are often used in residential homes or buildings. The PV tilt angles tested are 0, 15, 30 and 90º by placing a constant bulb in its position. The results of the observations show that a slope of 0º produces the highest PV electrical power, although it is not significant compared to the other 3 slope angles. The decrease in PV output power occurs when the slope angle increases. Optimum power of 16.93 Watt is obtained by using a Hannochs bulb at a power of 15 Watt with an angle of elevation of 0º. Furthermore, the power decreased to 16.33, 12.92, and 12.91 Watts at angles of 15, 30 and 90º, respectively. Further research is still needed by increasing the variation of bulb power above 15 Watts to validate the position of the PV panels on the walls of the building according to light source.

Penerapan Termoelektrik Ganda pada Mesin Pendingin Air Minum sebagai Solusi Penghematan Energi Amrullah Amrullah; Zuryati Djafar
Jurnal Teknologi Terapan Vol 1, No 1 (2015): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Modul termoelektrik merupakan suatu alat yang bekerja untuk menghasilkan dingin dengan memanfaatkan energi listrik. Pemilihan modul ini didasarkan pada beban kalor, beda temperatur dan daya listrik yang digunakan. Termoelektrik pendingin memiliki beberapa kelebihan diantaranya tidak berisik, mudah perawatan, tidak memerlukan banyak komponen tambahan dan ramah lingkungan. Penerapan termoelektrik dengan dua tingkat atau lebih yang dikombinasikan pada mesin pendingin merupakan metode penting untuk meningkatkan kinerja termoelektrik. Pada penelitian ini akan dilakukan pengujian kinerja modul termoelektrik pendingin pada dispenser air minum dengan memanfaatkan tegangan listrik DC. Model termoelektrik yang akan diuji adalah modul ganda yang dirangkai secara seri listrik dan paralel listrik dengan meninjau temperatur air yang didinginkan, daya listrik yang digunakan termoelektrik dan kecepatan pendinginan. Hasil penelitian menunjukkan bahwa modul terbaik dari segi temperatur air, kecepatan pendinginan dan penghematan energi listrik adalah termoelektrik ganda yang dirangkai secara seri pada tegangan 10 V. Hal ini dapat dilihat setelah 360 menit dengan temperatur air yang didinginkan 12oC, beda temperatur 28oC, kalor yang diserap 19.52810 W ,dan COP 1.25268.

ANALISA KINERJA MESIN REFRIGERASI RUMAH TANGGA DENGAN VARIASI REFRIGERAN Amrullah Amrullah; Zuryati Djafar; Wahyu Haryadi Piarah
Jurnal Teknologi Terapan Vol 3, No 2 (2017): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

The most important component in the refrigerator is the refrigerant. The refrigerant absorbs heat from one side and throw it to another side through the mechanism of evaporation and condensation. This research aims to develop a refrigeration machine using different refrigerants that can be observed with the performance of the compressor, evaporator performance and COP, and hoped this research can show the installation as a medium of learning in applying the working principle of refrigerator. The research method was experimental at setting 8 refrigeration machine with data collection for the pressure and temperature of R-12 and R-134a were measured at the compressor inlet and outlet for 300 minutes. Determining the value of the enthalpy at any point by using REFPROP program. The use of different refrigerants in a refrigeration machine indicates that the refrigerant R-134a better than R-12. It can be seen after 300 minutes for R-134a, compressor performance 29.4 kJ / kg, the performance of the evaporator is 144.5 kJ / kg, COP 4.9 while for R-12 compressor performance 21.8 kJ / kg, the performance of the evaporator is 12.3 kJ / kg, COP 4.6.

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