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ANALISA PERFORMA HEAT RECOVERY STEAM GENERATOR SEBELUM DAN SESUDAH CLEANING DI PT INDONESIA POWER TAMBAK LOROK SEMARANG MENGGUNAKAN SOFTWARE MATLAB R.12 Yusron, Ahmad; Saputro, Danang Dwi
Sainteknol : Jurnal Sains dan Teknologi Vol 16, No 1 (2018): Juni No 1, 2018
Publisher : Unnes Journal

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Abstract

Pembangkit Listrik Tenaga Gas Uap (PLTGU) atau pembangkit jenis combine cycle adalah gabungan antara Pembangkit Listrik Tenaga Gas (PLTG) dan Pembangkit Listrik Tenaga Uap (PLTU), dimana di dalam PLTGU memanfaatkan gas buang dari PLTG digunakan untuk menghasilkan uap yang digunakan sebagai fluida kerja di PLTU. Dalam instalasi PLTGU terdapat peralatan yang dinamakan Heat Recovery Steam Generator (HRSG). Peralatan utama dari pembangkit listrik tenaga uap yang berfungsi untuk memanfaatkan gas buang. Penggunaan HRSG dapat meningkatkan efisiensi dari pembangkit listrik tenaga uap karena HRSG hanya memanfaatkan gas buang dari turbin gas, gas buang yang terkandung didalam exhaust turbine gas yang temperaturnya masih mencapai 560o C masih bisa dimanfaatkan untuk memproduksi uap air bertekanan. Pada penelitian ini variabel bebas yang digunakan adalah variasi beban yang diberikan pada saat pagi, siang dan malam hari sedangkan Variabel terikat pada penelitian ini adalah temperature, tekanan, entalpi dan massa aliran. Pada bulan Agustus efisiensi HRSG sebesar 78,9% turun sebesar 4,05% untuk bulan September. Sedangkan penurunan bulan Oktober dan November masing-masing sebesar 9,64% dan 33,63%. Nilai penurunan efisiensi semakin besar mendekati masa cleaning. Hal ini karena semakin mendekati masa cleaning, kondisi HRSG semakin buruk yang berpengaruh terhadap kinerja HRSG yang semakin buruk pula. Pada bulan Desember setelah dilaksanakan cleaning, nilai rata-rata efisiensi HRSG kembali meningkat sebesar 89.3%.
STUDI PENDAHULUAN TENTANG PENERAPAN METODE AMBANG BERTINGKAT UNTUK ANALISIS KEKERINGAN HIDROLOGI PADA 15 DAS DI WILAYAH JAWA TIMUR Indarto, Indarto; Wahyuningsih, Sri; Pudjojono, Muhardjo; Ahmad, Hamid; Yusron, Ahmad
JURNAL AGROTEKNOLOGI Vol 8 No 02 (2014)
Publisher : Faculty of Agricultural Technology, University of Jember

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Abstract

This research deals with identification of potential hydrological drought at 15 watersheds in Eastern part of East Java Province. Hydrological drought events is indicated by water deficits at the main river of the watersheds during certain period of record. Discharge data from 15 watersheds in East Java are used as main input for this analysis. TLM modul based on HydroOffice platform is used to calculate the deficit. Deficit event is counted when the discharge during more than > 7 days is below the threshold level. The threshold level is set up using percentile 90% (Q90). The value of Q90 is determined from discharge times series. Furthermore, the discharge is rangked from high to low flow. Results from TLM are then imported to EXCEL for further analysis. Furthermore, GIS software package (Quantum GIS) is used for mapping the spatial variation of discharge values (avarage, maximum, Q90), frequency and duration of deficits events. This analysis produces the spatial maps of discharge value and deficit events ( averaged annually).Keywords: TLM, hydrological drougth, percentile 90 (Q90), discharge
Analisis Kinerja Penyelesaian Sengketa Informasi pada Komisi Informasi Daerah Kabupaten Cirebon Yusron, Ahmad
JIKE : Jurnal Ilmu Komunikasi Efek Vol 2 No 1 (2018): DESEMBER
Publisher : Prodi Ilmu Komunikasi, FISIP, Universitas Muhammadiyah Cirebon

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Abstract

One important element in public information disclosure is the Information Commission. the information commission has a function in conducting mediation and adjudication. The Cirebon Regency Regional Information Commission is one of the commissions authorized to resolve information disputes in Cirebon Regency. the important thing in carrying out its duties is the Cirebon Regency Regional Information Commission's performance. The performance will be related to human resource competencies. The formulation of research is the competence and performance of the Secretariat and the Regional Information Commission of Cirebon Regency in resolving information disputes. The purpose of the study was to determine the competence and performance of the Secretariat and the Regional Information Commission of Cirebon Regency in resolving information disputes. This study uses a quantitative approach. The research data was taken through a questionnaire with a total sampling method from the secretariat elements and commissioners. The results obtained that human resource competencies secretariat unit  and commissioner have very good competence in resolve information disputes. the performance of the secretariat and commissioners based on statistical calculations is stated to be very good.