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ANALISIS KINERJA ALAT SUPERHEATER PADA INSTALASI PEMBANGKIT TENAGA UAP Sugiarto, Tris; Soekardi, Chandrasa
ENGINEERING Vol 4, No 1 (2012)
Publisher : ENGINEERING

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1135.204 KB)

This paper presents the performance characteristic of a superheater of boiler power plant evaluated by measuring the working parameters such as pressure, temperature, steam flowrate, and gas temperatures flowing through the equipment as a function of time during 12 months of operation with the aim of providing data on the influence of fouling on superheater performance. These data were used to calculate the change of heat transfer rate with time as fouling deposition progressed. The results showed that after 12 months of operation the heat transfer rate declined by 28% below the initial condition. This condition is probably due to more severe fouling in the equipment. The gas flow rate must be reduced below its design value in order to maintain the design heat duty when the equipment is first placed in service. Thus the equipment will have to be taken out for cleaning at an undesirable time. To avoid these conditions it seems interesting to apply the rational design method providing available information of time dependence of fouling thermal resistance.Keywords : boiler, superheater, maintenance, cleaning interval, fouling, heat load, fouling thermal resistance

PERANCANGAN DAN PREDIKSI PERFORMANCE SEBUAH ALAT KONDENSOR INSTALASI PROSES PEMBUATAN ES BALOK ., Darmansyah; Soekardi, Chandrasa
INTEKNA Vol 12, No 2 (2012)
Publisher : Politeknik Negeri Banjarmasin

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The energy consumption of a compression refrigeration system depends the ability of the condenser to release heat. Improved condenser design can make a significant contribu-tion to increase the heat removal in the condenser that in turn reduces the energy con-sumption. This paper presents, firstly the optimization design of a condenser with the objective to estimate the minimum dimension required for a given heat duty, and se-condly the prediction of the condenser performance when it is first placed in service. Vari-ous design variables such as tube diameter, pitch ratio, tube layout, and fouling factor are considered. Simultance optimization of these variables was tried and 9 design configu-rations have been experimented. The effect of the design variables and its constraints on the number of tubes required for the condenser are discussed. The results showed that the design conditions that give the minimum number of tube of 187 will be at tube diame-ter 1.5 inch, tube layout 30o, pitch ratio 1.25, and excess area 1.25.Â The results of the performance calculations showed that when the condenser is first placed in service its performance is beyond the design conditions. The condenser performance will attain its design conditions when the fouling factor approachs the value that was selected at the design stage.

ANALISIS KINERJA ALAT SUPERHEATER PADA INSTALASI PEMBANGKIT TENAGA UAP Sugiarto, Tris; Soekardi, Chandrasa
ENGINEERING Vol 4, No 1 (2012)
Publisher : Universitas Pancasakti Tegal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1135.204 KB)

This paper presents the performance characteristic of a superheater of boiler power plant evaluated by measuring the working parameters such as pressure, temperature, steam flowrate, and gas temperatures flowing through the equipment as a function of time during 12 months of operation with the aim of providing data on the influence of fouling on superheater performance. These data were used to calculate the change of heat transfer rate with time as fouling deposition progressed. The results showed that after 12 months of operation the heat transfer rate declined by 28% below the initial condition. This condition is probably due to more severe fouling in the equipment. The gas flow rate must be reduced below its design value in order to maintain the design heat duty when the equipment is first placed in service. Thus the equipment will have to be taken out for cleaning at an undesirable time. To avoid these conditions it seems interesting to apply the rational design method providing available information of time dependence of fouling thermal resistance.Keywords : boiler, superheater, maintenance, cleaning interval, fouling, heat load, fouling thermal resistance

PERANCANGAN DAN PREDIKSI PERFORMANCE SEBUAH ALAT KONDENSOR INSTALASI PROSES PEMBUATAN ES BALOK ., Darmansyah; Soekardi, Chandrasa
INTEKNA informasi teknik dan niaga Vol 12 No 2 (2012)
Publisher : P3M Politeknik Negeri Banjarmasin

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KARAKTERISTIK BEBAN TERMAL MESIN PENGKONDISIAN UDARA PADA RUANGAN PEMROSESAN BATERAI LITHIUM Budihadi, Agus; Soekardi, Chandrasa
Jurnal Ilmiah Teknologi dan Rekayasa Vol 24, No 1 (2019)
Publisher : Universitas Gunadarma

Karakteristik termal sirkulasi aliran udara dingin di dalam ruang pemrosesan baterai lithium pada sebuah industri yang berlokasi di Jakarta telah diteliti secara eksperimental. Mesin pengkondisian udara yang dipergunakan pada ruang tersebut sering beroperasi pada kondisi yang berbeda-beda, tanpa diketahui kondisi operasi mana yang paling optimal dalam hal konsumsi energinya. Serangkaian pengujian telah dilakukan dengan mengukur temperatur, kelembaban, dan laju aliran udara di dalam ruang pemrosesan baterai untuk memperoleh gambaran kondisi operasi yang terbaik. Hasil pengukuran dipergunakan untuk mengevaluasi beban termal pada mesin pengkondisian udara. Pengujian dilakukan pada tiga hari yang berbeda, masing-masing dengan kondisi operasi tertentu yang serupa dengan yangseperti yang biasa diterapkan sehari-hari pada mesin tersebut. Hasil rangkaian pengujian, dibandingkan dengan dua kondisi operasi lainnya yang menunjukkan bahwa mesin pengkondisian udara bekerja paling efisien sepanjang hari apabila dioperasikan pada kondisi di mana aliran udara suplai dari evaporator berada pada temperature 19 oC dan kelembaban 66 %, dengan kecepatan rata-rata 2 m/s. Konsumsi energinya paling tinggi terjadi apabila mesin dioperasikan pada kondisi di mana udara suplai temperaturnya 15 0 C dan kelembaban 53 %.

ANALISIS KINERJA ALAT SUPERHEATER PADA INSTALASI PEMBANGKIT TENAGA UAP Tris Sugiarto; Chandrasa Soekardi
Engineering : Jurnal Bidang Teknik Vol 3 No 1 (2012): April
Publisher : Universitas Pancasakti Tegal

This paper presents the performance characteristic of a superheater of boiler power plant evaluated by measuring the working parameters such as pressure, temperature, steam flowrate, and gas temperatures flowing through the equipment as a function of time during 12 months of operation with the aim of providing data on the influence of fouling on superheater performance. These data were used to calculate the change of heat transfer rate with time as fouling deposition progressed. The results showed that after 12 months of operation the heat transfer rate declined by 28% below the initial condition. This condition is probably due to more severe fouling in the equipment. The gas flow rate must be reduced below its design value in order to maintain the design heat duty when the equipment is first placed in service. Thus the equipment will have to be taken out for cleaning at an undesirable time. To avoid these conditions it seems interesting to apply the rational design method providing available information of time dependence of fouling thermal resistance.Keywords : boiler, superheater, maintenance, cleaning interval, fouling, heat load, fouling thermal resistance

PERANCANGAN DAN PREDIKSI PERFORMANCE SEBUAH ALAT KONDENSOR INSTALASI PROSES PEMBUATAN ES BALOK Darmansyah .; Chandrasa Soekardi
INTEKNA informasi teknik dan niaga Vol 12 No 2 (2012)
Publisher : P3M Politeknik Negeri Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar

The energy consumption of a compression refrigeration system depends the ability of the condenser to release heat. Improved condenser design can make a significant contribu-tion to increase the heat removal in the condenser that in turn reduces the energy con-sumption. This paper presents, firstly the optimization design of a condenser with the objective to estimate the minimum dimension required for a given heat duty, and se-condly the prediction of the condenser performance when it is first placed in service. Vari-ous design variables such as tube diameter, pitch ratio, tube layout, and fouling factor are considered. Simultance optimization of these variables was tried and 9 design configu-rations have been experimented. The effect of the design variables and its constraints on the number of tubes required for the condenser are discussed. The results showed that the design conditions that give the minimum number of tube of 187 will be at tube diame-ter 1.5 inch, tube layout 30o, pitch ratio 1.25, and excess area 1.25. The results of the performance calculations showed that when the condenser is first placed in service its performance is beyond the design conditions. The condenser performance will attain its design conditions when the fouling factor approachs the value that was selected at the design stage.

ANALISIS PENGARUH EFEKTIVITAS PERPINDAHAN PANAS DAN TAHANAN TERMAL TERHADAP RANCANGAN TERMAL ALAT PENUKAR KALOR SHELL & TUBE Chandrasa Soekardi
SINERGI Vol 19, No 1 (2015)
Publisher : Universitas Mercu Buana

Kajian dalam tulisan ini berisi gambaran tentang hasil analisis pengaruh rata-rata faktor efektivitas perpindahan panas dan faktor koefisien perpindahan panas global terhadap dimensi utama hasil perancangan APK shell & tube dengan metode efektivitas-NTU. Faktor efektivitas perpindahan panas 35%, 40%, dan 45% dan koefisien perpindahan panas global 1700 W/m2K, 1900 W/m2K, dan 2100 W/m2K dipilih sebagai batasan experimen. Hasil rangkaian perhitungan menunjukkan bahwa APK memiliki dimensi utama yang paling ekonomis pada saat dirancang dengan menggunakan efektivitas perpindahan panas 35% dan koefisien perpindahan panas global 2100 W/m2K.

ANALISIS ALIRAN UAP PADA NOZZLE TIP SAMPLING PROBE PLTP MENGGUNAKAN COMPUTATIONAL FLUID DYNAMICS Bayu Yoga Prawira; Chandrasa Soekardi
SINERGI Vol 21, No 3 (2017)
Publisher : Universitas Mercu Buana

Tulisan ini berisi gambaran tentang hasil analisis aliran uap pada Nozzle Tip Sampling Probe di lapangan Pembangkit Listrik Tenaga Panas Bumi dengan menggunakan perangkat lunak Computational Fluid Dynamics (CFD). Tujuan penelitian ini adalah untuk mempelajari mengapa sering terjadi perbedaan hasil pengukuran temperatur dari diameter lubang nozzle tip dengan ukuran 0,125 inch dan 0,25 inch. Simulasi dengan menggunakan perangkat lunak CFD diterapkan terhadap aliran fluida uap panas yang mengalir di dalam sebuah saluran berdiameter 0,5 inch dengan laju aliran massa 23,15 kg/s, tekanan aliran 18,48 bar, dan temperatur fluida 212,97°C. Proses ini dilakukan dengan memasang dua buah sampling probe berukuran berbeda untuk mempelajari vektor kecepatan, vektor tekanan, dan vektor temperaturnya. Hasil simulasi memperlihatkan bahwa kecepatan rata-rata dan temperatur rata-rata aliran uap panas yang bersirkulasi di sekitar nozzle tip sampling probe dengan tip berdiameter 0,125 inch lebih tinggi daripada nozzle tip berdiameter 0,250 inch.

ANALISIS ECONOMIZER#2 PADA HEAT RECOVERY STEAM GENERATION (HRSG) DI TURBIN GAS#2 UNTUK PROSES MAINTENANCE DI PT. XXX Jojo Sumarjo; Chandrasa Soekardi
BAROMETER Vol 2 No 1 (2017): Barometer
Publisher : Fakultas Teknik, Universitas Singaperbangsa Karawang

Economizer#2 pada Instalasi Pembangkit Daya yaitu pada HRSG (Heat Recovery Steam Generator)di Turbin Gas#2, sering mengalami maintenance atau cleaning dari pada seharusnya (tidak sesuai dengan spesifikasi dari alat tersebut) hal ini mengakibatkan performanya menurun dan biaya maintenance meningkat. Evaluasi performa pada alat tersebut telah dilakukan dengan pengujian pada skala industri yang dilaksanakan selama 5 bulandengan interval waktu selama 48 jam (2 hari).Terjadi penurunan performa pada alat tersebut akibat dari bertambahnya faktor pengotor (fouling factor) yang merupakan fungsi dari waktu, dengan tahanan termal asimtotis aktual akibat faktor pengotor sebesar 0.01689 (m2K)/W dan cleaning intervalnya hampir selama 5 bulan untuk proses maintenance, mengurangi lose time pada produksi kertas, dan menekan maintenance cost secara signifikan.

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