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Journal : Semesta Teknika

Pengaruh Fraksi Udara Terhadap Koefisien Perpindahan Kalor Kondensasi Refrigeran Petrozon Rossy-22 Di Dalam Pipa Tegak Sudarja, Sudarja; Purnomo, Purnomo; Prajitno, Prajitno
Jurnal Semesta Teknika Vol 10, No 2 (2007): NOVEMBER 2007
Publisher : Jurnal Semesta Teknika

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Abstract

Petrozon Rossy-22 is one of hydrocarbon refrigerants which environmentally safe, since there is no effect on either ozone depletion or global warming. In the refrigeration cycle, imperfect vacuuming process or other factors that permit circulation of air taken place in the system predicted influencing heat transfer rate in condenser. Therefore, research on the influence of air fraction against condensation heat transfer coefficient of Petrozon Rossy-22 inside vertical pipe to be done. A modified refrigeration system of vapor compression was applied in this research, where the condensation was done in the 2 meters straight vertical condenser (double pipe heat exchanger, that further called as test section). The diameter of internal and external pipe were ¾” and 1 ¼” respectively. Electric heater was installed on upstream of the test section. Mixture of air- refrigerant was flowed downward inside internal pipe, while cooling water was flowed upward through annulus. The varied parameters were: air fraction, air-refrigerant and cooling water flow rate. The result of the research indicated that condensation heat transfer coefficient significantly decreased when air fraction increased. The proposed empiric equation is :       Nu = 0.0138. (1-w)8.8198. Re0.7941. Pr4.7315with determination coefficient of 0.6927 and average absolute deviation of 17.65 %. The equation was for Re= 6.922-12.953, Pr= 2,008-2,696, and w= (0,25-1)%.
Karakterisasi Aliran Uap-Kondensat pada Saluran Mendatar Berdasarkan Pengukuran Temperatur Sukamta, Sukamta; Indarto, Indarto; Purnomo, Purnomo; Rokhmat, Tri Agung
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
Publisher : Jurnal Semesta Teknika

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Abstract

The objective of the current investigation is to find out temperature distribution regimes in a horizontal pipe when condensation process is happened.  The research was conducted at Pusat Studi Ilmu Teknik Universitas Gadjah Mada. The experiment apparatus consists of an inner annulus pipe made from copper (din = 17.2 mm, do = 19 mm) with the length of 1.8 m. The outer annulus pipe is a galvanized iron pipe (din = 108.3 mm, do = 114.3 mm) with the length of 1.6 m. Thermocouples type K 36 TT OMEGA with chromel (+) and alumel (-) materials were used as temperature sensors, to detect the spread of temperature in radial or axial direction along the pipe. The measurement ranged from -50 to 260 oC, with an accuracy of 0.01 °C. A data logger of RX 40 serial (OMRON, 20 Channels) was used to read and record temperature data with the sampling rate of 5 Hz. In the experiment, the water (H2O)was heated using a boiler to generate steam which was then flowed and condensed inside the annulus pipe to form a steam-condensate two-phase flow in horizontal pipe. On the other hand, the water was used as a coolant in the outer of annulus pipe. The results indicated that the temperature distribution regimes are influenced by axial posisition.The farther distances from the inlet the lower the temperatures being recorded which indicate the increase of film condensate thickness. Such phenomena can affect slugging in the location.
Identifikasi Pola Aliran Dua Fasa Uap-Kondensat Berdasarkan Pengukuran Beda Tekanan pada Pipa Horisontal Sukamta, Sukamta; Indarto, Indarto; Purnomo, Purnomo; Rohmat, Tri Agung
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
Publisher : Jurnal Semesta Teknika

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Abstract

An experiment of two-phase flow patterns of steam-condensate based on differential pressure measurement in horizontal tube was conducted by varying the flow rate of the steam. The experiment utilised annulus pipe with inner section test pipe was made from copper and outer section was made from Galvanized Iron Pipe (GIP) wrapped with a 10-mm-thick insulation. The pipe was 1.6 meter length, and 4 inch outer diameter and 17 mm inner diameter. The two-phase flow regime was investigated based on pressure gradien between its inlet and outlet. In order to support the result, visualition was conducted using a ¾ inch diameter and 1.3 m length of transparent pipe connected with the test pipe section. Five variations of steam flow rate ranging from 0.00211361 m3/s to 0.007078511 m3/s were selected. The results show that for lowest steam flow rate, stratified flow pattern was identified while for the ot her variations, stratified, wavy, plug and slug flow pattern were observed. Wavy flow pattern occured on transition of stratified to slug or plug. Annular flow pattern was not observed in this experiment. Generally speaking, an increase in steam flow rate resulted in a more significant pressure gradient signals.
Co-Authors , Agustiansyah . Zulfan Abdul Ghofur Abid, Moh. Khusnul Achmad Hufad Achmad, Mansur Achmad, Syaefudin Adhim Kurniawan, Hanif Afandi, Muhamad Sidik Afif , Azzah Afifah Aghnia Wulandari Agnes Kurniawan Agus Budiman Agus Karyanto Agus Muhammad Hariri, Agus Muhammad Agustiana, Elia Agustin, Natasya Ahmad Rizani, Ahmad Ainun Nikmati Laily Aisyah Yusofia, Siti Aji Prasetya Wibawa Akhmad Endang Zainal Hasan Akhyadi, Ade Sadikin Alin Liana Amalia, Lathifah Amin Setyo Leksono Ana Hidayati Anak Agung Gede Sugianthara Andreas Luki Indratmoko Andrew Johan Angga Hadiapurwa Anggono, Atma Cahyo Aprilia, Tsaqif Ardiansyah, Mochamad Wildan Ardika, Made Ariansyah, Mochamad Yunus Arini, Rani Eka Asih, Rizqi Retno Aslam Chitami Priawan Siregar, Aslam Chitami Priawan Assyadera Marwan, Vannisa Az Zahra, Puti Azaria, Tabitha Aziz Purwantoro Bagyo Yanuwiadi Bahana Aditya Adnan Bintari Rukmono Budi Cahyono, Ilham BUDI SETIADI DARYONO Chandra, Fredy Cucu Sukmana, Cucu Dad Resiworo Sembodo, Dad Resiworo Dadang Yunus Lutfiansyah, Dadang Yunus dahyar daraba, dahyar Damayanti, Fransisca Dellya, Terryluana Dewi Puspitasari DIAH RACHMAWATI Dian Julianto Wahyudi Diatrinari, Farizka Didik Nurhadi Dika, Johan Wayan Dini Oktavia, Salsa Diniharianti, Yusfira Dwi Agus Sudjimat Dwi Putranto, Rahmat Dwi Sulistyaningsih Dwiyanto, Felix Andika Dwiyono, Gunawan Dzaki, Muhammad Fadhil Dzikrillah, Jordan Amran E. Suharyanto Eddy Sutadji Edy Setiti Wida Utami Eka Lestari Hafqi Putri Eka Tarwaca Susila Putra Eko Ganis Sukoharsono Eko Suroso Elda Nazriati Eliza Fitria Endah Wahyuni Endang Dwiyanti Endang Purwaningsih Endang S. Wardhani Enrico, Steven Erma Handarsari Erwin Yuliadi F.X. Susilo, F.X. Fadillah, Azi Fadillah, Faisal Fairuz , Sayida Abqaria Fairuz, Sayida Abqaria Fajar, Latahita Farhati, Ismi Fatmasari Sukesti Febriansah, Aris Triwahyu Fegeler, Sando Felix Partono Fiandani, Ambar Fitriani, Annisya Fitriani, Evi Tunjung Franciscus Xaverius Susilo, Franciscus Xaverius Gassing, nasirah Guntur Cahyono, Guntur Habibi, Muhamad Hamim Sudarsono . Hanafi, Fuad Handayani, Ayu Handayani, Christifani Handayani, Sekti Hanin, Jihan Al Hapsari, Dyah Ayu Kunti Hariri, Agus M Harsuko Riniwati Hediningsih, Yekti Helina, Selvi Heny Herawati Hidayati, Islamiyah Nur Husna, Fathiyah I GEDE SWIBAWA, I GEDE I Gede, Swibawa I Ketut Suada I Wayan Susila Ilyas, Muh. Inaku, Awaluddin Hidayat Ramli Indah Pratiwi Indarto Indarto Indradewa, Rhian Indriyati . Irhamni, Muhammad Ricza Issirep Sumardi Iwan Nugroho Izzaturrijal, Izzaturrijal Jamalam Lumbanraja Jati Batoro Juhana Suhanda, Juhana Junairiah Junairiah Juniarahman, Nur Azizah Juwita Juwita, Juwita Kartikawati, Dwi Kartini, Apriani Dwi KETUT AYU YULIADHI Khasani Khasani Kirana, Tjandra Koderi Kusiyah Kuswanta Futas Hidayat Laili Hidayati Latifah Latifah Lestari Wibowo Lientje Setyawati Lilik Sugirahayu Lilis Sulistyorini Linda Oktavianingsih Lubis, Siti Hawa M.Nurdin Ma'ruf, Ma'ruf Maftuchin Romlie Maghfiroh, Muliatul Mahardhika, Aditya Putra Mahdi Mahdi, Mahdi Mahyudi, Erik Tri Maksum Maksum Mardhiyyah, Khansa'atul Maria, Riri Maria, Riri Marsono Marsono Maulidiyah, Nur 'Aini Mazarina Devi Merdiana, Eryka MERTA, I NGURAH MEGA Miftakhul Nizar, Angga MK, Iwa Garniwa Muchsin Muchsin Muhammad Aji Nugroho Muhammad Kamal Muhammad, Badarruddin Musfirotun, Latifah MUSLIMIN IBRAHIM Mutamam, Mohamad Hadi Ali Nabila, Khurin Nabilah, Syifa Nada, Rona Sifaun Nadya Permata, Andhini Nafrizal, Nafrizal Najmudin, Muhammad Faisal Naldi, Anri Nanang Yusroni Natasha, Felisitas Negara, Balqis Najma Nelly Patria Nengsih, Luluk Wahyu Nike Kamarubiani Nisoh, Anan Nisrina Nisrina Ni’matuzahroh, Ni’matuzahroh Novitasari, Salwa Aulia NUNUNG, AI Nurdiansyah, Yohan Nurhafid, Mohammad Nurhasanah Nurhasanah Nuri Aslami Nurliawati, Afifah Nurwegiono, Muhammad Nuzulah, Unsiyah Olivia Cindowarni Oxamudra, Levana P Purwanto Pardamean Naibaho, Sahabman Tua Parwata, I Made Oka A Pasyah, A. Chalid Paul Benyamin Timotiwu Pebriyanti, Bunga Peni, Wiwik Prabowo, Bagas Pradani, Merinda Sintya Prajitno Prajitno Prameswari, Maria Immaculata Pramono, Atik Pramono, Elvina Pramudia, Joni Rahmat Prastyo, Adam Pratama, Bernardinus Pratama, Yolanda Lusiana Pribadi, Marius PUJI LESTARI Purnomo Puspa Anggraini, Leny Puspita, Malika Dwi Putra, Anugrah Perdana Putra, Apriza Hongko Putri , Nabila Adelia Putrianto, Novenda Putrianto, Novenda K. Putrianto, Novenda Kartika Rabiatul Adawyah, Rabiatul Rachmat Subagyo Radix Suharjo Rahayu Astuti Rahmawati, Nur'azizah Raihandhany, Reza Rama Danti, Yulita Ramadana, Muhammad Rifqy Ramadhani, Ayu Syahputri Ramadhani, Naely Azkiya Ratih Pratiwi Rengga Prakoso Nugroho Rengganis, Mufidah Revikhasa, Ariyo Riandi, Ahmad Riansa, Yulius Rika Lidyah Rika Purnamasari Riko Herdiansah Rini Dharmastiti Rita Ekarina Roberdi, Roberdi Rohman, Randi Abdur Romadhoni, Revianto Rosma Hasibuan, Rosma Rosmia, Ade Romi Rosyadah, Sirly Amria Rosyida, Chusna Nur Rudi Siswanto, Rudi Rudy Setiawan Rugayah Rugayah Ruruh Anjar Rwandini, Ruruh Anjar Sabaria, Ria Saepudin, Asep Saipul Nasution Santoso, Agung Dwi Saputra, Endra Saputra, Syifa Sasmitha, Cendana Anggun Saw Shu Zhen, Angelica Audrey Sa’adi, Sa’adi Setiyowati, Sari Setyani, Elvi Setyawati, Yuli Setyo Dwi Utomo Shahada, Rukma Amala Shifah, Layyinatush Sigit Dwi Maryanto Siti Nurhidayah Soejanto, Jessica Clarissa Soetam Rizky Wicaksono Solikhah, Putri Irma Solikhatin, Umi Solikhin ., Solikhin Solikhin Solikhin Solly Aryza Stefanus Yufra M. Taneo Sudarja Sudarja, Sudarja Sudi Pramono . Sugiyanto - Suharmanto Sukamta Sukamta Sulistiyanto, Hendrik Sunday Noya Suputa Suputa Suraya Suraya Suskandini Ratih Dirmawati SUWARNO HADISUSANTO Syahfarini, Zakinah Mutiara Syahrani, Kristinda Syamsu Rijal Syamsul Hadi Syifa’ul Qolbi, Muhammad Tahir, Irwan Tamam, Berliyan Tamjidilah, Mastiadi Taniawati Supali Taqiyya, Hedona Hilwa Taslim, Muhammad Tati Tati Tawiri, Ndeva Helmi Teguh Oktiarso, Teguh Titik Nur Aeny Tjahaya Haerani Tony Liwang Tri Agung Rohmat Tri Agung Rokhmat, Tri Agung Tri Dekayanti, Tri Tri Rini Nuringtyas Trianti Nugraheni Triyono Triyono Tuti Alawiyah Tuti Nuraini Tuwoso Untung Sujianto Utama, Agung Bella Putra Utomo, Condro Uyu Wahyudin Wahyu Hidayat Wardhani, Windi Novia Ratri Wardoyo Wardoyo Wati, Irma Hajjar Widiamsa, Adam Edward Wijaya, I Made Saka Wilandari, Riri Yahya, Maula Devina Yanti Shantini, Yanti Yasir Sidiq Yerry Soepriyanto Yolanda, Metta Yossie Susanti Eka Putri Yoto Yoto, Yoto Yulia Fitriani, Yulia Yuliaristiawan, Ervan Dwi YURIDA EKAWATI, YURIDA Yuswono Hadi Yuyun Fitriana Zuairiyah, Zuairiyah Zulhanif, Zulhanif