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Improve of Water Flow Acceleration in Darrieus Turbine Using Diffuser NACA 11414 2,5R Nugroho, Setyo; Safitra, Arrad Ghani; Aribowo, Teguh Hady; Julianto, Mochammad Arief
EMITTER International Journal of Engineering Technology Vol 6, No 1 (2018)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24003/emitter.v6i1.236

Indonesia has potential hydro energy around 70000 MW which has been used around 6% (3529 MW). One of the development constraint is the stream velocity in Indonesian rivers is relative low. It causes bigger turbine dimension needed to achieve power which is desired. Â An alternative is to utilize adiffuser, which is a device that could accelerate the fluid flow in order to give more energy to the turbine. Based on contiunity equation, diffuser can increase velocity by ratio of cross-section area. It can be Â used to achieve expected power as long as it is not too much reduce the pressure. This research is conducted in 0.566 m/s of water velocity with Darrieus turbine with hydrofoil NACA 0018, height 0.74 m, radius 0.17 m, chord 0.11 m and 3 number of blades. The performance (Cp) was determined by numerical and experimental without and with diffuser NACA 11414 2.5R for variation of angle 8o, 16o, and 20o. Both of those result showed that the best performance of NACA 11414 2,5R is on angle 16o which numerically has stream velocity 0,91 m/s of water and 7 times of Cp, while experimentally has 0,891 m/s of water velocity and 3,16 times of Cp. This diffuser could improve the power generated by the turbine and increase the turbine efficiency.

STUDI EKSPERIMEN PENGARUH POROSITY RATIO PADA PERFORATED TWISTED TAPE INSERT TERHADAP KARAKTERISTIK HEAT TRANSFER DAN FRICTION FACTOR PADA PENUKAR KALOR PIPA GANDA Puspitasari, Susi; Safitra, Arrad Ghani
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Heat exchanger is used device to transfer thermal energy (enthalpy) between two or more fluids at different temperatures. One type of heat exchanger is double pipe heat exchanger. Double pipe heat exchanger consists of one pipe placed concentrically in another pipe with a larger diameter. One fluid passes through the inner pipe and the other fluid passes through the outer pipe (annulus). Performance of double pipe heat exchangers can be determined based on the characteristics of heat transfer and friction factor. One effort to improve the performance of double pipe heat exchanger can by passive method which is adding perforated twisted tape in the inner pipe. Perforated twisted tape had three different porosity ratios, that is 1.88, 3.77, and 5.65% that comparison with plain twisted tape (porosity ratio 0). Fluid flowed in double pipe heat exchanger is water in liquid phase in laminar-transition flow regime. Reynolds number in annulus is made constant at 2000, while in inner pipe is 1000-5000. Temperature of water entering annulus and inner pipe is kept constant at 20ÂºC and 50ÂºC, respectively. From the experimental results it found that perforated twisted tape increased Nusselt number and friction factor values respectively 0.1-0.8% and 203-1536% higher than double pipe heat exchanger without twisted tape (plain tube). Perforated twisted tape with porosity ratio 3.77% has the best performance, that is increasing Nusselt number average of 0.31% from 28.8913 in plain tube to 28.9810 and increasing friction factor average of 366.34% from 0.6521 in plain tube to 3.0410.

ANALISIS BEBAN PENDINGINAN DAN OTTV PADA BANGUNAN GEDUNG RUMAH SAKIT CEMPAKA PUTIH PERMATA SURABAYA Arifin P. P., Moch. Denis; Safitra, Arrad Ghani; G. P., Hendrik Elvian
Prosiding Seminar Nasional Sains dan Teknologi Terapan Pendekatan Multidisiplin Menuju Teknologi dan Industri yang Berkelanjutan
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (267.687 KB)

Konservasi energi didefinisikan sebagai penggunaan energi, sumber energi dan sumber daya energi secara efisien dan rasional tanpa mengurangi penggunaan energi yang memang benar-benar diperlukan. Konservasi dilakukan pada salah satu rumah sakit di Surabaya yaitu Rumah Sakit Cempaka Putih, Kebon Agung, Surabaya. Konservasi energi difokuskan pada sistem tata udara dengan metode menghitung Cooling Load Temperature Difference (CLTD) dan Overall Thermal Transfer Value (OTTV) untuk mengetahui peluang penghematan energi. OTTV memiliki standar nilai yaitu ? 45 watt/m2yang ditentukan oleh SNI 03-6389-2000 sedangkan perhitungan beban pendinginan akan dibandingkan dengan kapasitas AC yang terpasang. Hasil perhitungan beban pendinginan dengan asumsi okupansi setiap ruangan maksimum maka gedung RSIA Cemapaka Putih Permata termasuk tidak terjadi pemborosan ketika dibandingkan dengan kapasitas AC yang terpasang namun dari sisi kenyamanan dapat dikatakan kurang memenuhi kebutuhan. Hasil perhitungan OTTV gedung RSIA Cemapaka Putih Permata dengan nilai OTTV sebesar 31,47 Watt/m2 termasuk bangunan hemat energi. Penerapan yang dapat diterapkan berdasarkan analisa di atas yaitu penambahan kapasitas AC supaya tercapainya kenyamanan yang dibutuhkan dan selanjutnya dikuiti penerapan penggantian pendingin dengan MC-22 guna untuk menekan konsumsi daya listrik sebesar 20%.

Studi Eksperimen Pengaruh Kecepatan Aliran dengan Penambahan Insert Twisted Tape terhadap Performa Double Pipe Heat Exchanger Aji, Pandu Gautama; Amalia, Rif?ah; Safitra, Arrad Ghani
Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Vol 2 (2019): PROSIDING SENTIKUIN
Publisher : Fakultas Teknik Universitas Tribhuwana Tunggadewi

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The double pipe heat exchanger (DPHE) is one type of heat exchanger (HE) that is commonly used in industrial applications such as electricity generation, petrochemical industry, process industry, and other industries. The double pipe heat exchangers are commonly used because of low design costs and maintenance costs. The need to achieve optimal double pipe heat exchanger performance, this research will examine the optimization of double pipe heat exchanger performance by varying fluid flow velocity and adding twisted tape insert with a twist ratio (H/D) = 6 in terms of Nusselt number (Nu), friction factor (f), and effectiveness (?). The test is carried out with fluid in the form of water and fluid flow velocity variations are 2.5, 3.5, 4.5, 5.5, and 6.5 LPM. The experimental results show that the Nusselt number value and effectiveness have increased with increasing fluid flow velocity. While the friction factor value decreases with increasing fluid flow velocity. The increase in Nusselt numbers was 2.14 times and the effectiveness value was 8.69%. While the value of the friction factor decreased by 55%. The optimum fluid flow velocity obtained from the results of the study is 6.5 LPM with Nusselt number, friction factor, and effectiveness reaching 48.43; 0.27; and 0.259.

Studi Eksperimen Pengaruh Kecepatan Aliran terhadap Performa Double Pipe Heat Exchanger Elby , Alvin Christian ; Amalia, Rif?ah ; Safitra, Arrad Ghani
Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Vol 2 (2019): PROSIDING SENTIKUIN
Publisher : Fakultas Teknik Universitas Tribhuwana Tunggadewi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (545.689 KB)

Heat Exchanger is a device used to transfer thermal energy between two or more fluids, or between solid surface and fluids, with different temperature. One of low capacity heat exchanger known in Industry is the double pipe heat exchanger. This heat exchanger usually consists of two concentric pipes with plain of finned inner pipe. Because of its low capacity, the performance of double pipe heat exchanger needs to be improved to achieve optimal operating condition. This research contains an experimental study of optimizing double pipe heat exchanger?s performance by varying the Reynolds number which is reviewed from the value of Nusselt number (Nu) and friction factor (f). The double pipe heat exchanger is tested with 2500, 3500, 4500, 5500, and 6500 Reynolds number value with 20?C of cold fluid flows through the inner pipe, and 40?C of hot fluid flows through the annulus pipe. The fluids flow with counterflow condition. Based from the experimental results, it is known that by the increasing of Reynolds number, the Nusselt number increased by 2.14 times, and the friction factor decreased by 1.13 times from Reynolds number of 2500 to Reynolds number of 6500. The optimal Reynolds number resulted in Reynolds number of 3900 with Nusselt number of 32.41 and friction factor of 0.0491.

Pengaruh Tinggi Reservoir dan Debit Masukan terhadap Efisiensi Pompa Hidram Syariful Hadi, Muhammad; Nugroho, Setyo; Ghani Safitra, Arrad; Ghani Safitra, Arrad
Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Vol 2 (2019): PROSIDING SENTIKUIN
Publisher : Fakultas Teknik Universitas Tribhuwana Tunggadewi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (479.743 KB)

Water is a fundamental human need. One effort to obtain a constant water supply is by pumpingmethod. The Hydram pump is one of the alternatives that can be used to meet these needs. Inaddition to cost-effective, this pump is also very simple in manufacturing, assembling, andoperation. The installation components of the hydram pumps consist of water tanks, input pipes,output pipes, exhaust valves, sender valves, and air tubes. The workmanship of this final taskwill be measured the number of discharge pumping, tapping the exhaust valve, pressuredischarge, D'aubuisson efficiency, and hydram pump efficiency to the height variation of thereservoir and discharge input. On the workmanship of this final task will be used the hydrampump with specification: 1-inch input pipe diameter, the output pipe diameter of 0.75 inches, thediameter of air tube 2 inch, high air tube 0.75 m, and heavy exhaust valve load 0.4 kg.Variations in working conditions that will be tested on the Hydram pump are high reservoir (1m, 1.25 m, 1.5 m) and discharge input (10 LPM, 12 LPM, 14 LPM). From the experiments thathave been carried out the highest pumping discharge of 2.1 LPM at an altitude of 1.5 m with aninput discharge of 14 LPM. The large pressure discharge value that occurs during the workingcycle of the hydram pump is directly proportional to the reservoir height. Best hydram pumpperformance is obtained at 1.5 m altitude variation with 14 LPM input discharge where theefficiency of D'aubussion is 44.06% and the efficiency of the Hydram pump 29.91%.

Pengaruh Tinggi Reservoir dan Debit Masukan terhadap Efisiensi Pompa Hidram Syariful Hadi, Muhammad; Nugroho, Setyo; Ghani Safitra, Arrad; Ghani Safitra, Arrad
Prosiding SENTIKUIN (Seminar Nasional Teknologi Industri, Lingkungan dan Infrastruktur) Vol 2 (2019): PROSIDING SENTIKUIN
Publisher : Fakultas Teknik Universitas Tribhuwana Tunggadewi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (479.743 KB)

Water is a fundamental human need. One effort to obtain a constant water supply is by pumpingmethod. The Hydram pump is one of the alternatives that can be used to meet these needs. Inaddition to cost-effective, this pump is also very simple in manufacturing, assembling, andoperation. The installation components of the hydram pumps consist of water tanks, input pipes,output pipes, exhaust valves, sender valves, and air tubes. The workmanship of this final taskwill be measured the number of discharge pumping, tapping the exhaust valve, pressuredischarge, D'aubuisson efficiency, and hydram pump efficiency to the height variation of thereservoir and discharge input. On the workmanship of this final task will be used the hydrampump with specification: 1-inch input pipe diameter, the output pipe diameter of 0.75 inches, thediameter of air tube 2 inch, high air tube 0.75 m, and heavy exhaust valve load 0.4 kg.Variations in working conditions that will be tested on the Hydram pump are high reservoir (1m, 1.25 m, 1.5 m) and discharge input (10 LPM, 12 LPM, 14 LPM). From the experiments thathave been carried out the highest pumping discharge of 2.1 LPM at an altitude of 1.5 m with aninput discharge of 14 LPM. The large pressure discharge value that occurs during the workingcycle of the hydram pump is directly proportional to the reservoir height. Best hydram pumpperformance is obtained at 1.5 m altitude variation with 14 LPM input discharge where theefficiency of D'aubussion is 44.06% and the efficiency of the Hydram pump 29.91%.

STUDI EKSPERIMEN PENGARUH POROSITY RATIO PADA PERFORATED TWISTED TAPE INSERT TERHADAP KARAKTERISTIK HEAT TRANSFER DAN FRICTION FACTOR PADA PENUKAR KALOR PIPA GANDA Puspitasari, Susi; Safitra, Arrad Ghani
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 11 No 2 Februari 2019
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v11i2.806

Heat exchanger is used device to transfer thermal energy (enthalpy) between two or more fluids at different temperatures. One type of heat exchanger is double pipe heat exchanger. Double pipe heat exchanger consists of one pipe placed concentrically in another pipe with a larger diameter. One fluid passes through the inner pipe and the other fluid passes through the outer pipe (annulus). Performance of double pipe heat exchangers can be determined based on the characteristics of heat transfer and friction factor. One effort to improve the performance of double pipe heat exchanger can by passive method which is adding perforated twisted tape in the inner pipe. Perforated twisted tape had three different porosity ratios, that is 1.88, 3.77, and 5.65% that comparison with plain twisted tape (porosity ratio 0). Fluid flowed in double pipe heat exchanger is water in liquid phase in laminar-transition flow regime. Reynolds number in annulus is made constant at 2000, while in inner pipe is 1000-5000. Temperature of water entering annulus and inner pipe is kept constant at 20ÂºC and 50ÂºC, respectively. From the experimental results it found that perforated twisted tape increased Nusselt number and friction factor values respectively 0.1-0.8% and 203-1536% higher than double pipe heat exchanger without twisted tape (plain tube). Perforated twisted tape with porosity ratio 3.77% has the best performance, that is increasing Nusselt number average of 0.31% from 28.8913 in plain tube to 28.9810 and increasing friction factor average of 366.34% from 0.6521 in plain tube to 3.0410.

STUDI NUMERIK PENGARUH OBSTACLE PRISMA SEGITIGA SUDUT TEKUK 40Â° TERHADAP PERPINDAHAN PANAS PADA PEMANAS UDARA SURYA BERBENTUK TRAPEZOIDAL Dewi, Naili Husna; Diana, Lohdy; Safitra, Arrad Ghani
Prosiding Seminar Nasional Sains dan Teknologi Terapan Inovasi Teknologi Infrastruktur Berwawasan Lingkungan
Publisher : Institut Teknologi Adhi Tama Surabaya

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Matahari merupakan sumber energi terbarukan, Energi tersebut dapat digunakan sebagai pemanas udara. Prinsip kerja pemanas udara surya adalah energi panas matahari ditransmisikanÂ oleh kaca kemudian diserap oleh plat penyerap. Panas tersebut digunakan untuk memanaskan udara yang dialirkan ke dalam saluran plat penyerap melalui bantuan induced fan. Pada penelitian ini, membahas tentang pengaruh obstacle berbentuk prisma segitiga terhadap perpindahan panas dan penurunan tekanan di dalam saluran pemanas udara yang berbentuk trapezoidal. Obstacle yang digunakan berbentuk prisma segitiga dengan sudut tekuk 40Â° disusun secara segaris atau inline dengan memvariasikan parameter S/H= 0.7; 1; 1.3. Penelitian dilakukan secara simulasi numerik dengan menggunakan software CFD komersial. Simulasi dilakukan secara tiga dimensi menggunakan model RNG k-? viscous model. Kriteria konvergen 10-6 untuk residual kecepatan, momentum serta energi.Â Kondisi batas yang diberikan antara lain kecepatan sisi masukan 2.62m/s, sepanjang dinding saluran diberikan heat fluxs 620W/m2, dinding bawah terisolasi sempurna serat sisi keluaran merupakan outflow. Hasil simulasi menunjukan obstacle dengan sudut tekuk 40Â° dengan parameter S/H=1.3 memiliki nilai kenaikan temperatur sebesar 17.73K, energi yang berguna 132.12watt, penurunan tekanan terendah sebesar 31.59Pa dan memiliki effectiveness tertinggi sebesar 0.78 sehingga dapat dikatakan paling optimum

KARAKTERISTIK MENARA PENDINGIN TIPE INDUCED DRAFT DENGAN BAHAN ISIAN KAIN FLANEL Safitra, Arrad Ghani; Sholihah, Fifi Hesty; Fauziyyah, Inas Nabilah
Prosiding Seminar Nasional Sains dan Teknologi Terapan Inovasi Teknologi Infrastruktur Berwawasan Lingkungan
Publisher : Institut Teknologi Adhi Tama Surabaya

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Makalah ini menyajikan tentang studi eksperimen untuk menguji karakteristik kinerja termal pada counter flow wet cooling tower yang direpresentasikan dengan panas yang dibuang ke atmosfir, efektivitas dan NTU. Cooling tower diisi dengan bahan isian kain flanel yang memiliki tinggi 0.3 m dan susunan bahan isianÂ zigzag, setengah, 2:1, dan susunan penuh. Pada makalah ini telah dianalisa pengaruh laju aliran udara pendingin terhadap temperatur, panas yang dibuang, efektivitas, dan NTU. Hasil eksperimen menunjukkan bahwa karakteristik menara meningkat dengan adanya peningkatan kecepatan udara pendingin yang disertai dengan variasi susunan bahan isian. Karakteritik tertinggi diperoleh pada bahan isian dengan susunan penuh yang ditambahkan lapisan penutup berupa kain flanel karena semburan air tertahan oleh kain flanel akibat adanya kapilaritas pada bahan. Kemudian dengan membandingkan bentuk susunan bahan isian dan variasi kecepatan udara pendingin, panas tertinggi yang dibuang adalah 5.02 kW, efektivitas 0.9 dan nilai NTU sebesar 4.19 pada kecepatan udara pendingin 7.1 m/s dengan variasi bahan isian menggunakan susunan penuh yang dilapisi kain flanel.

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