https://stt-pln.e-journal.id/powerplant/issue/feed JURNAL POWERPLANT 2020-10-02T18:35:39+00:00 Riki riki.ruli@sttpln.ac.id Open Journal Systems <p style="text-align: justify;">The Scientific Journal of "<strong>Jurnal PowerPlant</strong>" is a collection of scientific works by lecturers, researchers, and practitioners in the field of Mechanical Engineering that have been published by Institut Teknologi PLN d/h. Sekolah Tinggi Teknik PLN. This journal is the result of scientific work, research in the fields of Energy, Materials and Energy Conversion to contribute in writing scientific which will be useful for the application of science and technology, especially in the field of Mechanical Engineering.</p> <p style="margin-bottom: 0in; line-height: 150%;" align="justify"><span style="font-family: Times new roman, serif;"><span style="font-size: medium;">T</span></span><span style="font-family: Times new roman, serif;"><span style="font-size: medium;">he journal registered in the CrossRef with </span></span><strong><span style="font-family: Times new roman, serif;"><span style="font-size: medium;">Digital Object Identifier&nbsp;(DOI)&nbsp;prefix</span></span></strong><span style="font-family: Times new roman, serif;"><span style="font-size: medium;">: <a href="https://search.crossref.org/?q=PETIR" target="_blank" rel="noopener"><span style="text-decoration: underline;"><strong>10.33322</strong></span></a></span></span></p> <p style="text-align: justify;"><strong>P-ISSN:</strong><a href="https://portal.issn.org/resource/ISSN/2356-1513#" target="_blank" rel="noopener"><strong>&nbsp;2356-1513</strong></a><strong>&nbsp; &nbsp;</strong><strong>e-ISSN (electronics)</strong><strong>:&nbsp;</strong><strong><a href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1549263056&amp;1&amp;&amp;" target="_blank" rel="noopener">2656-372X</a></strong></p> https://stt-pln.e-journal.id/powerplant/article/view/978 Analisis Pengaruh Laju Kalor Kondensor HTC terhadap Kinerja Sistem Refrigerasi Cascade Dengan Refrigerant Hidrokarbon 2020-10-02T18:35:38+00:00 Hendri Hendri hendri@itpln.ac.id Suhengki Suhengki suhengki@itpln.ac.id Roswati Nurhasanah roswati@itpln.ac.id Prayudi Prayudi prayudi@itpln.ac.id <p><em>The need for low temperature storage rooms has not been fulfilled with a single refrigeration system. The problem with a single system is that vacuum pressure is needed to reach very low temperatures. The cascade refrigeration system with two HTC and LTC circuits was developed to answer the problem of low temperature space with hydrocarbon refrigerant. The research was carried out experimentally in the PLN IT Refrigeration System Laboratory. This research uses MC134-R404A and MC22-R404A refrigerant pairs, and uses a heat exchanger plate heat exchanger. From the analysis it was found that the MC22-R404A refrigerant pair had better performance COP, HRR, ratio mass than the MC134-R404A. From the research also obtained the results that the installed heat exchanger cannot work optimally. The results of this study will be very useful for developing further research in developing low temperature storage</em></p> 2020-07-12T23:07:11+00:00 ##submission.copyrightStatement## https://stt-pln.e-journal.id/powerplant/article/view/719 Pengaruh Perlakuan Panas Karburisasi Austempering Pada Baja Laterit Modifikasi Paduan Ni-Cr Terhadap Sifat Mekanik Dan Struktur Mikro 2020-10-02T18:35:39+00:00 Satrio Herbirowo satr006@lipi.go.id <p>Laterite steel is a steel with a low nickel content which is between 1 - 4.5 percent. Generally, the nickel content in laterite steel which was tried to be developed by LIPI ranged from 1.5 to 4.5 percent. The type of laterite steel developed from laterite ore is NPI (Nickel Pig Iron), a type of cast iron that has a high hardness value and optimal toughness. This material is widely used for grinding balls or Hard-Liner materials for crusher or grinder equipment. In the research of the heat treatment process, Carburization of Austempering uses laterite steel with Ni and Ni-Cr alloys. Where this study uses parameters of heating temperature in the Austenisasi temperature of 950 ºC and Austempering temperature of 400 ºC with the same holding time of 1 hour. In this study also used a variation of cooling media (quenching), namely angina fan, water and left in the furnace. Laterite steel which has been processed by carburization Austempering will be tested by testing hardness, impact, metallography. From the test results obtained test data where, the highest value of hardness is found in steel sample 2 (Ni-Cr), which cooling using a fan with a value of 63.6 HRC with the phase produced martensite. And the highest impact value is found in the sample steel 3 (Ni) which cools in the furnace with an impact value of 38J and the phase formed is bainite.</p> 2020-07-12T00:00:00+00:00 ##submission.copyrightStatement## https://stt-pln.e-journal.id/powerplant/article/view/652 Simulai Pengaruh Nilai Kalor Pencampuran Batubara dan Beban Terhadap Kinerja Pembangkit Termal Studi Kasus PLTU di Suralaya 2020-10-02T18:35:39+00:00 Prayudi Suparmin prayudi@sttpln.ac.id Hendri MT hendri@sttpln.ac.id <p><em>The performance of a boiler determined by the quality of coal as its fuel, influenced by its calorific value, moisture content, ash content, nitrogen, and carbon. To be use according the boiler specifications, the plant blends coal to get the heating value according to specifications. This study simulates the effect of mixing the coal heat value and load on the boiler performance</em><em> The coal used is MRC a heating value of 5041 kcal and LRC a heating value&nbsp; 4920 kcal, with a blending ratio of 10:90; 20: 80; 30:70; 40:60 and 50:50. The coal blending used method the Canterper approach, and the boiler efficiency uses standard the ASME PTC 4-1. The results research, that most optimal mixing a ratio of 40: 60 and 50: 50, a calorific value of 4999 kcal/kg. The efficiency boiler increase in proportion to the increase in the calorific value. The boiler efficiency highest at ratio mixture of 50:50. The boiler efficiency highest is 85.94% and minimum is 85.25%. Value characteristics specific coal consumption to decrease proportionally to increase calorific value, the value lowest specific consumption at a mixture ratio of 50:50. The value SFC lowest is 0.465 kg/kWh and the highest is 0.479 kg / kWh. The value calorie higher, the lower the amount of specific coal consumption</em></p> 2020-07-12T00:00:00+00:00 ##submission.copyrightStatement## https://stt-pln.e-journal.id/powerplant/article/view/549 Perancangan Tungku Pengolahan Limbah Plastik Dengan Metode Pemanasan Tidak Langsung 2020-10-02T18:35:39+00:00 Arief Suardi Nur Chairat ar13f5uard1@gmail.com <p><em>Mitigasi sampah plastik melalui proses daur ulang (recycling) menjadi sangat popular saat ini. Salah satu proses daur ulang yang lebih menjanjikan dan berprospek ke depan adalah dengan mengkonversi sampah plastik menjadi BBM. Langkah mitigasi ini tidak hanya bisa mengatasi persoalan sampah plastik saja, tetapi juga bisa memproduksi bahan bakar untuk kebutuhan energi serta mampu meningkatkan nilai ekonomis sampah plastik. Dalam penelitian ini akan dilaukan perancangan tungku untuk mengolah limbah plastik sebagai bahan bakar alternatif dengan metode cracking dan pirolisis, serta dampaknya terhadap ekonomi masyarakat. Hasil percobaan yang didapat adalah tungku pengolah plastik yang dibuat bisa digunakan untuk mengkonversi sampah plastik menjadi energi thermal untuk membakar bahan baku residu plastik yang bermacam-macam jenisnya sebanyak 20 kg. Dengan bahan baku tersebut bisa menghasilkan thermal selama 10 jam dan selama proses pembakaran masih menghasilkan asap meskipun relatif sedikit. Panas atau thermal yang dihasilkan selama percontohan maksimal 1050</em><em>°</em><em>C. Untuk mengoperasikan tungku, sebagai starter panas bisa menggunakan gas LPG. </em></p> <p><strong><em>Kata Kunci: tungku, perancangan, plastik, thermal</em></strong></p> 2020-07-12T00:00:00+00:00 ##submission.copyrightStatement## https://stt-pln.e-journal.id/powerplant/article/view/404 Analisis Pengaruh Penurunan Temperatur LMTD Terhadap Unjuk Kerja HRSG Pada PLTGU 2020-10-02T18:35:39+00:00 Prayudi Suparmin prayudi@sttpln.ac.id <p>The Semarang Gas Generation and Steam Power Plant (PLTGU) is one type of combine cycle which is expected to support electricity needs. Heat Recovery Steam Generator (HRSG) is a device that has a working principle such as a boiler, without the need for additional fuel, an energy source from exhaust gases that have high temperature gas turbines. The problem that in HRSG is the occurrence of pipe leakage which results in the efficiency of HRSG. With overhaul, namely replacing the pipe, cleaning the tube wall, and isolating the HRSG, and plugging the tube, the overhaul has an impact on decreasing the logarithmic mean temperature difference (LMTD) and increase heat Q the impact of efficiency HRSG. This study was conducted to analyze the effect of decreasing LMTD temperature on HRSG performance before and after overhaul. The research method used is descriptive method by conducting a case study in the PLTGU Tambak Lorok Unit 2 Semarang. The data needed in the study was taken directly from the CCR of PLTGU Tambak Lorok Unit 2 Semarang. The results of the analysis showed that after overhaul activities resulted in a decrease in the difference in LMTD temperature and increased the amount of heat in the HRSG. The decrease in the difference in LMTD HRSG due to overhaul activity will result in increased HRSG efficiency, while the increase in heat Q HRSG after overhaul will increase the efficiency of HRSG</p> 2020-07-12T00:00:00+00:00 ##submission.copyrightStatement##