Yogi Sirodz Gaos, Yogi Sirodz
Mahasiswa Program Ddoktoral, Program Studi Ilmu Keteknikan Pertanian Sekolah Pascasarjana IPB

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INVESTIGASI EKSPERIMENTAL PENGARUH LAJU ALIRAN MASSA AIR PADA SOLAR TERMAL TIPE CPC Marzuki, Edi; Nur Khasan, Mokhamad; Gaos, Yogi Sirodz; Juarsa, Mulya; Yulianto, Muhamad
Jurnal Energi Dan Manufaktur Vol 9 No 1 (2016): April 2016
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Optimasi penggunaan energi matahari masih perlu ditingkatkan, salah satunya dengan menggunakan kolektor surya.Panas yang diterima digunakan sebagai sumber kalor untuk sistem pembangkit Organic Rankine Cycle (ORC).Kegiatan penelitian diawali dengan desain, konstruksi, dan pengujian kolektor termal solar, tipe concentrated paraboliccollector (CPC). Banyak paramater yang mempengaruhi capaian temperatur pada CPC, salah satunya laju aliran.Tujuan penulisan makalah adalah untuk menentukan temperatur optimal CPC berdasarkan perubahan laju aliransecara eksperimen. Investigasi secara eksperimental dilakukan untuk dapat memanfaatkan potensi radiasi matahariyang bisa mencapai 5,2 kWh/m2 sebagai media evaporasi pada sistem pembangkit ORC yang merupakan langkahawal penelitian. Kolektor surya tipe CPC yang digunakan memiliki geometri panjang 1 m, tinggi 0,9 m, lebar alas 0,028m, lebar tutup 1,16 m. Solar collector dilapisi dua bahan yang berbeda yaitu polistirena foam dengan tebal 0,02 m danarmaflex dengan tebal 0,02 m. Pengambilan data dilakukan dengan melakukan pengukuran besaran radiasi dantemperatur pada dinding kolektor, temperatur masuk air, dan temperatur keluar air. Pengambilan data radiasi mataharimenggunakan lux meter dan temperatur menggunakan thermocouple tipe K. Hasil dari penelitian ini adalah temperaturcapaian maksimum terjadi ketika laju aliran massa air paling rendah.Kata kunci: Kolektor surya, CPC, temperatur, laju aliran, ORCAbstract:Optimization of solar energy utilization is still needs to be improved, either by using solar collectors. Absorbed heat willuse as a heat source for an Organic Rankine Cycle (ORC) plant system. Research activities begins with the design,construction, and testing of solar thermal collectors, the type of concentrated parabolic collector (CPC). Manyparameters that affect the achievement of the temperature on the CPC, one of which flow rate. The purpose in thispaper is to determine the optimal temperature CPC based on changes in flow rate experimentally. Experimentalinvestigation has been done to exploit the potential of solar radiation that could reach 5.2 kWh/m2 as evaporation mediain ORC plant system as the first step of the study. The CPC solar collectors type has geometries with length 1 m, height0.9 m, width of pedestal 0,028 m, and width 1.16 m cap. Solar collector coated with two different materials, namelypolystyrene foam with a thickness of 0.02 m and armaflex with a thickness 0.02 m. The data collection was performedby measuring the amount of radiation and temperature on the collector wall, the water inlet temperature, and wateroutlet temperature. Measurement for solar radiation was conducted using a lux meter, and temperature using athermocouple type K. The results of this study shows that the highest of temperature achievement is occurs for thelowest mass flow rate.Keywords: Solar collector, CPC, temperature, flow rate, ORC
EFEK VARIASI TEMPERATUR PELAT PADA CELAH SEMPIT REKTANGULAR TERHADAP BILANGAN REYNOLDS Saepudin, Saepudin; Gaos, Yogi Sirodz; Kusuma, Muhammad Hadi; Juarsa, Mulya; Marzuki, Edi; Heru, Gregorius Bambang
SIGMA EPSILON - Buletin Ilmiah Teknologi Keselamatan Reaktor Nuklir Vol 16, No 1 (2012): Februari 2012
Publisher : Badan Tenaga Nuklir Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/sigma.2012.16.1.2899

Abstract

Penelitian terkait manajemen keselamatan reaktor khususnya saat terjadi kecelakaanreaktor nuklir, salah satunya yaitu karakteristik bilangan Reynold pada celah sempit rektangular. Celahsempit yang berbentuk rektangular diasumsikan sebagai celah pada lelehan teras reaktor saat terjadi kecelakaanpada suatu reaktor nuklir. Penelitian tersebut perlu dilakukan untuk memahami fenomena pendinginanpada saat terjadinya kecelakaan pada suatu reaktor. Pemahaman yang diperoleh dapat digunakan untuk mengetahuikondisi kecelakaan yang terjadi pada reaktor daya dan reaktor riset. Penelitian ini bertujuan untuk memperolehkarakteristik bilangan Reynold pada celah sempit terhadap efek variasi temperatur pelat. Penelitian inidilakukan dengan 3 variasi temperatur pelat 30oC, 40oC, 60oC, dengan temperatur air masukan 40oC dan debitaliran konstan 0,472 L/s pada celah 2,25 mm. Eksperimen dilakukan dengan cara mengalirkan dengan debitaliran air 0,472 L/s dengan tempertur air 40oC kedalam celah sempit rektangular setelah pelat dipanaskan terlebihdahulu. Perekaman data pada saat eksperimen berlangsung dengan menggunakan sistem akuisisi data NIcDAQdengan laju perekaman 1 data per-detik. Hasil penelitian menunjukkan bahwa untuk keadaan pelat yangdipanaskan dengan temperatur air 40oC, terlihat bahwa bilangan Reynold pada celah semakin meningkat padadebit aliran yang konstan. Bilangan Reynolds tertinggi 37553 pada temperatur pelat 60oC, temperatur air 40oCdan debit aliran air 0,472 L/s. Persentase kenaikan bilangan Reynolds pada saat eksperimen untuk temperaturpelat 30°C didapatkan 0,14%, untuk temperatur pelat 40°C didapatkan persentase 0,07%, untuk temperaturpelat 60°C didapatkan persentase 0,24% dengan debit aliran air 0,472 L/s pada temperatur air masukan 40oC.Sehingga dapat disimpulkan bahwa perubahan temperatur pelat mempengaruhi perubahan bilangan Reynoldspada celah sempit rektangular.
ANALISIS SISTEM HEAT PUMP KOMPRESI UAP UNTUK PENGERINGAN GABAH Biksono, Damawidjaya; Nelwan, Leopold Oscar; Mandang, Tineke; Wulandani, Dyah; Gaos, Yogi Sirodz
Jurnal Keteknikan Pertanian Vol. 4 No. 2 (2016): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

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AbstractAs a drying system, heat pump drying with appropriate configuration is potential to safe energy. The objective of this research was to develop vapor compression heat pump system for rough rice drying and to obtain low energy consumption from several system configurations. Therefore, the model of vapor compression heat pump system was designed in which its configuration was modifiable. The result showed that the ratio of specific moisture extraction rate which calculated mechanic and thermal consumption (SMERTot) upon resistive heating dryer for those several configurations was 159 ? 329%. The open cycle heat pump drying method with intermittent operation produced the highest specific moisture extraction rate which only calculated thermal energy (SMERT) and SMERTot at 7.06 and 5.06 kg/kWh, respectively. Intermittent operation did not much influence drying rate but significantly reduced energy consumption. Ambient air inlet which placed before evaporator and condenser on a closed cycle could produce different SMERTot i.e. 4.01 dan 3.07 kg/kWh respectively. The utilization of ambient air through forced convection in heat exchanger could increase SMERTot, while the utilization of air flow the dryer from outlet could reduce SMERTot.AbstrakPengeringan heat pump merupakan sistem pengeringan yang berpotensi menghemat energi terutama apabila konfigurasinya sesuai. Tujuan dari penelitian ini adalah mengembangkan sistem heat pump kompresi uap (HPKU) untuk pengeringan gabah dan mendapatkan konsumsi energi yang rendah dariberbagai konfigurasi sistem. Untuk itu pada penelitian ini didesain sebuah model sistem pengering heat pump yang konfigurasinya dapat diubah-ubah untuk  pengeringan gabah. Hasil percobaan memperlihatkan bahwa rasio peningkatan specific moisture extraction rate yang memperhitungkan konsumsi energi mekanik dan termal (SMERTot) terhadap pengering pemanas resistif untuk berbagai konfigurasi tersebutadalah 159 ? 329%. Metode pengeringan heat pump siklus terbuka dengan pengoperasian HPKU yang intermittent memberikan specific moisture extraction rate yang hanya memperhitungkan konsumsi energi termal (SMERT) dan SMERTot yang paling tinggi yaitu masing-masing 7.06 dan 5.06 kg/kWh. Pengoperasian intermittent tidak banyak mempengaruhi laju pengeringan, tetapi secara nyata menurunkan konsumsi energi. Penempatan inlet udara lingkungan sebelum evaporator dan sebelum kondensor pada siklus tertutup memberikan SMERTot yang berbeda yaitu 4.01 dan 3.07 kg/kWh. Penggunaan udara lingkungan dengan menggunakan konveksi paksa melalui penukar panas dapat meningkatkan SMERTot, sedangkan penggunaan aliran udara dari keluaran pengering dapat menurunkan nilai SMERTot.
PENGARUH DEBIT ALIRAN AIR SISI PRIMER UNTAI UJI BETA TERHADAP EFEKTIVITAS ALAT PENUKAR KALOR Suhendra, Suhendra; Juarsa, Mulya; Kusuma, Muhammad Hadi; Tjahjono, Hendro; Gaos, Yogi Sirodz; Heru, Gregorius Bambang
SIGMA EPSILON - Buletin Ilmiah Teknologi Keselamatan Reaktor Nuklir Vol 16, No 1 (2012): Februari 2012
Publisher : Badan Tenaga Nuklir Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/sigma.2012.16.1.2898

Abstract

Telah dilakukkan analisis perubahan alat penukar kalor pada fasilitas Untai UjiBETA. Fasilitas Untai Uji BETA merupakan fasisilitas eksperimen untuk menginvestigasi fenomena thermohidrolikbaik dalam keadaan transien (kecelakaan) ataupun dalam keadaan tunak (operasi normal) sebagaisimulasi sistem pendingin. Adapun komponen dari untai uji BETA terdiri dari pre-heater, pompa primer dansekunder, alat penukar kalor, reservoir tank dan cooling tower. untuk meningkatkan performa alat penukarkalor yang terdapat di UUB adalah dengan cara mengganti alat penukar kalor tersebut. Dengan pergantian alatpenukar kalor maka perlu dilakukan karakterisasi untuk mengetahui performa alat tersebut. Eksperimen ini dilakukan dengan memvariasikan 3 macam debit aliran pada sisi primer, yaitu : 0,377 L/s, 0,472 L/s dan 0,567 L/s adapun untuk debit aliran pada sisi sekunder di beri nilai konstan, yaitu : 1,07 L/s dengan temperatur air60oC . Eksperimen karakterisasi di fokuskan untuk memperoleh hasil efektivitas temperatur pada alat penukarkalor pada kondisi untai uji tertutup. Hasil penelitian dengan kondisi untai tertutup menunjukkan bahwa padadebit aliran 0,377 L/s di dapat nilai efektifitas sebesar 0,35. Kemudian Pada debit aliran 0,472 L/s di dapat nilaiefektifitas sebesar 0,30 , dan pada debit aliran 0,567 di dapat nilai efektifitas sebesar 0,25. Dan ahasil analisapada eksperimen menunjukan bahwa debit aliran air mempengaruhi terhadap efektivitas pertukaran kalor padaalat penukar kalor dimana semakin besar debit aliran maka semakin kecil nilai efektivitasnya.
DESIGN OPTIMIZATION AND EXPERIMENTAL DATA OF LOW ENTHALPY GEOTHERMAL POWER PLANT DESIGN BY USING ORGANIC RANKINE CYCLE Gaos, Yogi Sirodz; Wicaksono, Muhammad Faisal; Rodiah, Iis
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol 2, No 1 (2016)
Publisher : UNIVERSITAS IBN KHALDUN BOGOR

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A lot of heat energy can be tap to produce electricity by converting the heat and enthalpy to move a steam turbine cycle, or usually known as Rankine Cycle. But steam cycle has to have a high temperature and high enthalpy, so lower temperature and lower enthalpy source such as geothermal brine water, solar thermal, and waste heat gas cannot be tap to produce electricity. These potential belongs to ORC or Organic Rankine Cycle. ORC has no need to utilized high temperature and enthalpy, it can use temperature as low as 80ºC instead of 170ºC or more. By utilizing ORC system, these sources is open to produce electricity. These days a lot of research for ORC is done either by simulation or by experiment and the source is also varied. For this case, the source is geothermal brine water. The design of ORC begins with calculating the overall ORC heat balance using Cycle Tempo. Thus the duty of preheater, evaporator, turbine, condenser, pump, and cooling tower can be obtained. Then using working fluid n-pentane, we calculate and optimized the thermal efficiency. After that, every individual equipment is designed and calculated by using HTRI. Design optimization which had been obtained then used as reference to do the experiment. Unfortunately, the data from the latest experiment showed that the temperature from the geothermal brine water has not met requirement yet. Therefore, further experiment has to be done with some improvement to the system.
REVERSE ENGINEERING OIL COOLER DOUBLE TUBE PLTA JATILUHUR Gaos, Yogi Sirodz; Damis Widiawati, Candra
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol 3, No 1 (2017)
Publisher : UNIVERSITAS IBN KHALDUN BOGOR

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Double tube heat exchanger is one of the modifications of shell and tube, which use as transformer cooler in power plant system AT PLTA Jatiluhur, Purwakarta, Jawa Barat. It has double tube, the outer contacts with the oil and the inside one contacts with water as cooling medium. One of the benefits of this type can reduce explosion risk of the transformer, because the warning system will be on when there is leakage at inside tube, so water and oil will not mix. But this type needs cost more expensive than the single one. ,Design optimization was using reverse engineering. The dimensions are 339.6 mm inner shell diameter, outer tube dimension 15mmOD, 1mmThickness, 2208mmLength, inside tube dimension 13mmOD, 1.2mmThickness, 2208mmLength, and 124 pcs in each. The performance tests of the reverse engineering at 23.23 MW were; 27.4oC/31oC water in/out, 41.5oC/38.8oC oil in/out, oil flow rate 2.92 kg/s, 10.94oC log mean temperature difference, and temperature work of transformer 41.1oC. Using reverse engineering the work temperature of transformer at 28 MW was 60oC when using original equipment the work temperature of transformer at 26 MW was 80oC. Design of reverse engineering increased cooling capacity 16% and only 71.43% from OEM.
ANALISA COOLING SISTEM GE FRAME 9 PLTG SICANANG 120MW Gaos, Yogi Sirodz; Widiawati, Candra Damis
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol 2, No 2 (2016)
Publisher : UNIVERSITAS IBN KHALDUN BOGOR

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Power plant is an industrial facility for the generation of electric power. Mechanical power is produced by a heat engine that transforms thermal energy, often from combustion of a fuel, into rotational energy for generator, than produces electric power. On all the power plant is operated in high temperature and high pressure, so it needed cooling system to prevent from over heating, if not the power plant system will be damaged. PLTG Sicanang produced 120MW electric power; the cooling systems consist of generator cooler and turbin cooler. Design input data was temperature inlet and outlet water, volumerate water, and ambient temperature. Design performance of generator cooler 1) capacity 2450 kW 2) water inlet 46.5oC and water outlet 40oC 3) water volume flow 330 m3/h 4) air volume flow 312m3/s. Design performance of turbin cooler 1) capacity 1570 kW 2) water inlet 56.3oC dan water outlet 46.5oC 3) water volume flow 140 m3/h 4) air volume flow 312m3/s. The actual performance for 50 MW load 1) generator cooler; water inlet 43oC, water outlet 40oC, water volumerate 330 m3/h, air volumerate 182m3/s 2)turbin cooler water inlet 47oC, water volumerate 140 m3/h, air volumerate 182m3/s. 100 MW load 1) generator cooler; water inlet 45oC, water outlet 40oC, water volumerate 330 m3/h, air volumerate 208m3/s 2)turbin cooler water inlet49oC, water volumerate 140 m3/h, air volumerate 208m3/s. The generator cooler has been designed with reverse surface 25% which was capable to cooling heat 3066 kW, where as the turbin generator has been designed with reverse surface 17% which was capable to cooling heat 1850 kW. The reverse surface was designed to anticipate hinger ambient temperature and over load.
EFEK SUDUT KEMIRINGAN UNTAI SIMULASI SIRKULASI ALAMIAH TERHADAP RUGI TEKANAN DI SEPANJANG PIPA Gaos, Yogi Sirodz
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol 1, No 1 (2015)
Publisher : UNIVERSITAS IBN KHALDUN BOGOR

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EFFECTS OF SIMULATION strand tilt angle NATURAL CIRCULATION OF LOSS IN ALL THE PRESSURE PIPE. Have been made to optimize the energy utilization efficiency, performed in addition to designing up a new energy conversion devices, as well as utilize natural laws that act as natural circulation phenomena. Experimental studies conducted to understand the natural phenomenon of circulation by calculating the pressure loss based on temperature changes in the cold and the heat in the USSA strand FT-02. USSA construction consists of FT-02 components of SUS 304 pipe 1 inch in diameter, heater, cooler and expansion tank. Experimental variation is the height difference between the hot side and cold side based on the variation of the angle of the strand, which is 30o, 60o and 90o or cooler altitude of 0.275 meters, 0.476 and 0.550 meters. Outlet temperature of the heater (TH) and the outlet of the cooler temperature (TC) is used as a parameter to be measured and on-record with a time span of the experiment for 40 minutes. Experimental results and calculations using multiple correlation showed, the pressure loss will have price stability in a row bar is 0.000044, 0.000063 and 0.00021 bar bar by changing the angle of 30o, 60o and 90o, while the influence of water mass flow rate led to an increase of 0.002626 (kg / s) to 0.01487 (kg / s). The effect of the forces that affect the loss of pressure has different characteristics for each of the difference in height cooler and heater.Keywords: angle, flow rate, pressure loss
ANALISIS KINERJA GASIFIER UNGGUN TETAP ALIRAN KE BAWAH MENGGUNAKAN UMPAN KAYU UNTUK MESIN PEMBANGKIT LISTRIK TENAGA GAS Gaos, Yogi Sirodz; Putra, Hanang Agna Pradana; Bahry, Syamsul
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol 1, No 1 (2015)
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (548.194 KB) | DOI: 10.32832/ame.v1i1.104

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Pengaruh Perubahan Material CuNi dengan Stainless Steel SA 213 TP304 terhadap Performansi Air Cooler Generator di PLTA Saguling Gaos, Yogi Sirodz; Widiawati, Candra Damis
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol 1, No 1 (2015)
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (578.619 KB) | DOI: 10.32832/ame.v1i1.101

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