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Roswati Nurhasanah
Jurusan Teknik Mesin, Sekolah Tinggi Teknik – PLN
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Perbandingan Efisiensi Boiler Awal Operasi Dan Setelah Overhaul Terakhir Di Unit 5 PLTU Suralaya Roswati Nurhasanah; Orlando Firdaus
JURNAL POWERPLANT Vol 4 No 1 (2016): JURNAL POWER PLANT
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/powerplant.v4i1.835

Abstract

The boiler is functioning equipment turn the water into steam by heating. Existing plants are specified in the supply of electrical energy required by konsumen.Effisiensi is one of the many parameters used to assess whether or not the performance of a boiler.Metode used in the calculation of boiler efficiency is the input-output method and heat losses by the aim of knowing the cause of the decrease in efficiency. Suralaya boiler efficiency analysis unit 5 meliputianalisaawaloperasidananalisasetelah terakhir.Dari overhaul both the analysis of these calculations will be elaborated based on the method of heat losses, thus resulting to a conclusion after comparison. Based on the analysis, the efficiency of the boiler when the last overhaul lower than initial efficiency of development. From the calculation of the authors analyzed the causes of decline in the efficiency and the conclusion of the decline 0.71% boiler efficiency and operation early last overhaul.
Pengaruh Penambahan Liquid Suction Heat Exchanger Terhadap Performa Mesin Pendingin Menggunakan R404A Roswati Nurhasanah; Prayudi Prayudi
JURNAL POWERPLANT Vol 4 No 2 (2016): JURNAL POWER PLANT
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (700.591 KB) | DOI: 10.33322/powerplant.v4i2.847

Abstract

One method to improve the performance of vapor compression refrigeration system using subcooling. The liquid line suction heat exchanger (LLHX) sub-cooler is a method to increase the cooling capacity of the evaporator by lowering temperature at the condenser outlet. LLHX always Increased effect of refrigeration, work of compressor and heat rejected in the condenser. The results Showed that LLHX lowering condenser exit temperature and exit temperature compressor increases as a result of superheat. LLHX exit temperature compressor with stable at 28oC compared to 16oC on the operation without LLHX in 60 minutes. The experimental results also showed that the evaporation temperature decreases of 15.2 with the addition LLHX be 17.4oC. and the latter can increase the value of COP of 2.85 until 3.5.
Co-Authors Orlando Firdaus Prayudi Prayudi