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All Journal Jurnal Teknik Mesin Jurnal Teknik ITS IPTEK The Journal for Technology and Science Journal of Energy, Mechanical, Material and Manufacturing Engineering Prosiding Seminar Nasional Sains dan Teknologi Terapan Otopro International Journal of Industrial Optimization (IJIO) International Journal of Mechanical Engineering Technologies and Applications (MECHTA) JMES The International Journal of Mechanical Engineering and Sciences Jurnal Nasional Aplikasi Mekatronika, Otomasi dan Robot Industri (AMORI) Sewagati
Heru Mirmanto
Department Of Mechanical Engineering, Institute Teknologi Sepuluh Nopember, Surabaya
Aerospace Engineering Arts Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

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Journal : IPTEK The Journal for Technology and Science

 1 
Numerical Study of Mixed Convection in A Cooled Room Dedy Zul Hidayat Noor; Heru Mirmanto; Eddy Widiyono; liza rusdiyana
IPTEK The Journal for Technology and Science Vol 26, No 1 (2015)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v26i1.570

Abstract

The present work is carried out to study laminar mixed convection heat transfer inside a rectangular cooled room numerically. The chosen model is considered as a representation of a room facing the sun with a floor releasing heat resulted by electronic components or human activities. The Reynolds number and Richardson number are varied from 100 to 400 and 0 to 3, respectively, in order to cover laminar mixed convection phenomena. For the considered range of Re dan Ri, the flow regimes fall into  three modes. The higher Nusselt numbers are found at the higher values of Re, on the other hand, the forced convection leads to higher heat transfer rate than the free/natural convection.
3-D Numerical Study of CFB 110 MW: Fluidization in Furnace and Cyclone with Loads And Air Combustion Variation Ari Wirahadi; Heru Mirmanto
IPTEK The Journal for Technology and Science Vol 30, No 2 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (791.476 KB) | DOI: 10.12962/j20882033.v30i2.4999

Abstract

Circulating Fluidized Bed (CFB) Boiler has advantages when uses low rank coal compared to Pulverized Boiler. It will be less operational cost but it has greater risk in degradation because of sands material inside the process. Air combustion between primary air and secondary air is one importance parameter that influence fluidization of CFB. Numerical simulation of commercial CFD was used with Eulerian multiphase model implemented to analyzed sand volume of fraction, air and sand velocity including distribution of pressure around furnace. It was used 55%-45% air combustion ratio of primary and secondary air as reference when boiler operated at 63% and 100% based on operation performance of CFB and then it was simulated with additional variation of air combustion ratio with 50%-50%. Simulation of 110% load was added using all of variation of air combustion. The simulation showed that fluidization with air combustion ratio 50%-50% and 55%-45% executed well when operated at 63%. Meanwhile, fluidization 100% and 110% with all those air combustion ratios would cause a great number of sands entered inlet cyclone and higher sands and air velocities.
Co-Authors Achmad Choiruddin Ahadiyat Luhung Jati Al Viandari, Nourma Andino Septian Ari Kurniawan Ari Wirahadi Arino Anzip Athallah Ramadhan Atria Pradityana Azlan Arifin Khan Bangga, Galih Dedy Zul Hidayat Noor Dedy Zulhidayat Noor Dwa Desa Warnana Dyon Athallah Ramadhan Eddy Widiyono Ferdina Ramadhansyah Garini, Sherly A. Gilang Firmansyah Gunawan Nugroho Hendro Nurhadi Herman Sasongko Ika Nurjannah Ika Nurjannah, Ika IKAP Utama Ilham Akbar Indriani, Rista F. Insani, Alif N. F. Ira M. Anjasmara, Ira M. Jati, Ahadiyat Luhung Joko Sarsetiyanto Komara, Eki Kusnadi, Dimitra Meidina Lestari, Wien Liza Rusdiyana Mariyono, M. Mashuri Mashuri Mashuri Mohammad Adenan Mohammad Haekal Muhammad Lukman Hakim Noor, Dedy Zulhidayat Nugrahani, Elita Fidiya Nur Ikhwan Palgunadi, Kadek H. Pasaribu, Johan Nicholas Pratama, Dandi S. Putra, Dhea P. N. Rizaldy Hakim Ash Shiddieqy Rohmadoni Rohmadoni Rr. Yuanita Dewi Saresty Saktiawan Okto Bertha Agustien Sarwono Sidi, Amor K. Suhariyanto Suhariyanto Widya Utama Wihardjaka, Anicetus