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The Effect of Nonwoven Microfiber Substrate Polypropylene Thickness to Air Filtration Performance of Polyacrilonitrille Nanofiber Rajak, Abdul; Syahputra, Tri Siswandi; Munir, Muhammad Miftahul; Khairurrijal, K.
Jurnal ILMU DASAR Vol 20 No 2 (2019)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1512.963 KB) | DOI: 10.19184/jid.v20i2.9658

Abstract

Since a nanofiber medium on itself is soft and fragile and cannot be used alone as air filters. Coating nanofiber on a rigid substrate to form a composite that can be handled readily is necessary. Beside can improve the filtration efficiency, adding the substrate will also save the use of nanofibers mat itself. The aim of this study is to evaluate the effect of substrate thickness on the performance of nanofibers mat in aerosol filtration in order to find the optimum thickness of substrate that can increase the quality of nanofiber filter. The substrate used was a low cost microfiber non-woven fabric made from polypropylene (PP). The nanofibers mat was composed of electrospun polyacrylonitrile (PAN) with concentration of 9 wt.% which dissolved at N,N dimethylformamide (DMF). Five variations of PP different in thickness was used as substrate. From the SEM image, it was found that there is increasing fiber diameter of PAN after electrospun into PP substrate. From the porosity estimation of each nanofiber, it was found that the porosity decreased with increasing the substrate thickness. For test the performance of nanofiber filter, the particles of polystyrene latex (PSL) which generated by atomizer was used as the aerosol particle. In addition, to evaluate the performance filter in PM2.5 filtration, the experiment was carried out with generate the smoke from burning incense. Air filtration performance of all variations is obtained by comparison the results of measurement including: pressure drop, efficiency and quality factor. From the results, there is limitation on the substrates thickness based on the value of the quality factor obtained. Overall, PP nonwoven as the substrates gives the great contribution on the efficiency of PAN nanofiber. Keywords: substrate, polypropylene, thickness, nanofiber, air filtration.
Startup Reaktor Cepat berpendingin Gas Berbahan Bakar UN-PuN dengan Daya 800 MWth Syahputra, Tri Siswandi; Suud, Zaki
POSITRON Vol 7, No 1 (2017)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v7i1.20809

Abstract

Studi strategi startup reaktor cepat berpendingin helium dengan bahan bakar uranium alam dan campuran plutonium dari PWR telah dilakukan. Reaktor dengan keluaran daya menengah dioperasikan dengan pengisian ulang bahan bakar setiap 10 tahun selama 40 tahun beroperasi. Perhitungan dilakukan dengan menggunakan sistem pengkodean SRAC dan JENDL -33 library, dengan model teras cylindrical cell 2D R-Z. Reaktor didesain dengan strategi stratup pembakaran CANDLE (Constan Axial shape of Neutron flux, nuclide densities and power shape During Life of Energy producing reactor) yang dimodifikasi dalam keadaan non equilibrium state. Dalam skema ini, teras aktif dibagi menjadi region-1 sampai dengan region-10 arah aksial dengan volume yang sama dan 2 region arah radial dengan fuel fraction berbeda. Bahan bakar fresh Uranium alam awalnya dimasukkan ke dalam region- 1, sedangkan region lainnya diisi oleh campuran uranium alam dan spent fuel dari PWR. Setelah satu siklus operasi, dilakukan pergeseran region-1 ke region-2, region-2 ke region -3 dan seterusnya. Bahan bakar pada region -10 dibuang sedangkan region-1 akan diisi kembali oleh bahan bakar Uranium alam. Ukuran daya reaktor 800 MWth dengan variasi fraksi bahan bakar telah diselidiki. Perhitungan dilakukan terhadap desain teras reaktor yang menggunakan variasi fraksi bahan bakar di bagian dalam dan luar : 50%,55%; 55%,60%, dan 60%,65%. Reaktor dengan daya 800 MWth dengan fraksi bahan bakar 50,55% menunjukan desain yang optimal. Rasio antara puncak dengan daya rata-rata diperoleh nilai 1.57 arah radial dan 2.57 arah aksial.