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

Published : 7 Documents
Articles

Found 7 Documents
Search

ANALlSIS ENERGI DAN SEBARAN SUHU PADA GASIFIER UNGGUN TETAP Gaos, Yogi Sirodz; Tambunan, Armansyah H.; Abdullah, Kamaruddin; Prawoto, Prawoto
Jurnal Keteknikan Pertanian Vol 21, No 2 (2007): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Original Source | Check in Google Scholar

Abstract

ABSTRACT Performance test of Imbert Downdraft Gesifier by using cyclone as an auxiliary for tar filtering has been conducted with three kinds of feeding chips, i. e; borneo wood, tamarind wood and leucena wood. The research has been developed to support as an energy source for combined heat power generation. Gesifier will be coupled to diesel generating set and waste heat from the exhaust gas will be used as energy source for an adsorption type refrigeration system. The test had produced the best combustible gas with the chemical composition CO = 55,59 %, CH4 = 0,14 %, C2H6 = 0,3 % and C3H8= 0, 08 %. The maximum temperature 1142 oC has been found in oxidation zone based on the leucena wood test, meanwhile the calculation result of energy availability for the combustible gas was 60,39 kW and specific energy availability was 0,082 kg/kWh. The test result of temperature distribution along the reactor compare to numerical solution of mathemathicai modelling has got the similar curve. Diterima: 26 Pebruari 2007, Disetujui: 25 Mei 2007
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 | Original Source | Check in Google Scholar | Full PDF (320.258 KB)

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.
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 | Original Source | Check in Google Scholar | Full PDF (652.66 KB)

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.
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

Show Abstract | Original Source | Check in Google Scholar | Full PDF (197.672 KB)

Abstract

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

Show Abstract | Original Source | Check in Google Scholar | Full PDF (596.839 KB)

Abstract

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

Show Abstract | Original Source | Check in Google Scholar | Full PDF (760.128 KB)

Abstract

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

Show Abstract | Original Source | Check in Google Scholar

Abstract

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