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POSSIBILITY TO REDUCE DRUDGERY AND TIME IN HARVESTING INDIVIDUAL RIPE FRUITS OF JATROPHA CURCAS LINN BY WHOLE BUNCH HARVESTING Silip, Jupikely James; Tambunan, Armansyah H.; Hambali, Erliza; Sutrisno, ,; Surahman, Memen
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 38 No. 2 (2010): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (190.486 KB) | DOI: 10.24831/jai.v38i2.1800

Abstract

<!-- /* Font Definitions */ @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:-1610611985 1073750139 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin-top:0cm; margin-right:0cm; margin-bottom:10.0pt; margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:Calibri; mso-fareast-font-family:"Times New Roman"; mso-bidi-font-family:"Times New Roman"; mso-ansi-language:IN; mso-no-proof:yes;} @page Section1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> A study was conducted to determine Jatropha fruits ripening uniformity on its tree and bunches characteristics. To get more information about its ripening off, the tree characteristics a respiration pattern was determined. The data were collected on ?  ve trees for each ten selected accessions (n=50) for fruit ripening uniformity on its trees study and ?  fteen bunches for each seven selected accessions (n=105) for fruits bunches ripening uniformity study at two jatropha pilot projects at Sabah state of Malaysia at the end of March 2009 when the trees were exactly one year old. This study con?  rmed that heterogeneous ripening occured in all jatropha accessions and within individual jatropha bunches. Respiration tests con?  rmed that jatropha is a climacteric fruit. The results showed an upsurge in CO2 production at the end of ripening and at the beginning of senescence. This study has  revealed indications of the possibility to harvest jatropha fruit in bunches rather than harvesting individual ripe fruit, which could potentially improve harvest ef? ciency by reducing harvesting time and drudgery. Keywords: ripening, respiration rate, post-harvest, climacteric
EXPERIMENTAL AND THEORITICAL ANALYSIS OF THERMAL PROPERTIES IN ZEPHYR BAMBOO TALI (GIGANTOCHLOA APUS KURZ) Mudiastuti, Sri; Tambunan, Armansyah H.; Simbolon, Athur
Jurnal Keteknikan Pertanian Vol. 25 No. 2 (2011): Jurnal Keteknikan Pertanian
Publisher : PERTETA

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Abstract Specific heat, thermal conductivity and thermal diffusivity of Bamboo panel are usable to support  the Programming of Design and Planning in the Structure of the Agricultural Building Construction. The Specific heat of Bamboo?s fiber, sheet and panel using the method of mixtures varied from 1.585-2.789 J/gr oC, with a mean value of 2.227 J/gr oC in the temperature difference range of  9 ± 0.1oC . It was found it will increase linearly with an increase in the sample temperature. Thermal conductivity values of Bamboo?s fiber based on the transient line heat source technique varied from 0.1035 x 10-3-0.1322 x10-3 J/ cm2 sec oC in the sample temperature 22 to 30 oC on thermal diffusivity of bamboo fiber in 22-30 oC was found to be 0.0823 x 10-3J/cm secoC.   The sorption Isotherm and the water activity in the bamboo?s panel is depend on the chemical composition, glue laminated, additive and the porosity. There are related with the absorbing of the water into the bounded water and the diffusivity of the water in and out the panel. The moisture equilibrium range are 7.89 to 19.22 percent in the control of the circumstances and 11 to 75 % of  the environment.relative humidity. Keywords: bamboo zephyr, thermal properties, sorption isothermal Abstrak Kapasitas panas jenis, konduktivitas dan difusivitas ernal panel bambu dapat digunakan untuk mendukung Program Desain dan Perencanaan pada Struktur Bangunan dan Gedung dibidang pertanian. Kapasitas panas jenis, pada panel dan papan sera bambu dengan menggunakan metode campuran bervariasi 1,585-2,789 /gr J 0C, dengan nilai rata-rata 2,227 J/gr 0C pada rentang perbedaan suhu 9 ± 0.1 0C. Ditemukan akan serat bambu yang berbasis pada teknik pemanasan transient bervariasi dari 0,1035 x 10-3-0.1322 x 10-3 J/cm2 0C det pada suhu sampel 22-30 OC pada difusivitas termal serat bambu di 22-30 0C ditemukan menjadi 0,0823 x 10-3 J/cm secoC. Penyerapan secara isotermis dan kegiatan aktifitas air pada panel bambu, tergantung pada komposisi kimia, bahan perekat laminasi, aditif dan porositas. Mempunyai kaitan dengan penyerapan air. ke dalam air terikat difusivitas air yang masuk dan keluar panel. Nilai rentang dari keseimbangan kelembaban adalah 7,89 sampai 19,22 persen dalam pengendalian kondisi lingkungan dari 11 sampai 75% dari kelembaban lingkungan. Kata Kunci: Bambu angin sepoi-sepoi, sifat termal, Penyerapan Isotermal Diterima: 13 April 2011; Disetujui: 29 Agustus 2011  
RE-CIRCULATING RICE DRYERS SUITABLE FOR LARGE AMOUNT OF LOADING CAPACITY.  IT GENERALLY COMPRISES OF TWO PARTS, THE TEMPERING SECTION AND A DRYING SECTION, AND THE GRAINS ARE DRIED IN AN INTERMITTENT WAY UNTIL THE FINAL MOISTURE CONTENT OF THE GRAINS CAN BE ACHIEVED.  WET GRAINS ARE INITIALLY DRIED FOR ABOUT 11 MINUTES WITHIN THE DRYING SECTION OF THE DRYER.  THE GRAINS THEN ARE CONVEYED TO THE TEMPERING SECTION WHERE IT WILL BE STORED FOR ABOUT 40 TO 50 MINUTES.  AT EVERY PASSES, ABOUT LESS Prasetyo, Totok; Abdullah, Kamaruddin; Tambunan, Armansyah H.; Nelwan, Leopold; K.D, I Made
Forum Pasca Sarjana Vol. 32 No. 1 (2009): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Re-circulating rice dryers suitable for large amount of loading capacity.  It generally comprises of two parts, the tempering section and a drying section, and the grains are dried in an intermittent way until the final moisture content of the grains can be achieved.  Wet grains are initially dried for about 11 minutes within the drying section of the dryer.  The grains then are conveyed to the tempering section where it will be stored for about 40 to 50 minutes.  At every passes, about less than 2%(wb) of the moisture content can be removed from the grains. The number of passes required to accomplish a drying process in a recirculation dryer depends on the initial moisture content and the amount of rough rice to be dried.  The drying and tempering duration can be adjusted by means of a mechanical valve.  The purpose of this study was to examine the performance of re-circulating dryers equipped with pneumatic conveyor instead of bucket elevator to reduce electricity cost and heated using a proper blend between kerosene and jatropha oil.  Several experimental runs had been conducted under a constant drying temperature of 60oC and was controlled by adjusting the rate of fuel consumption.  The experimental results showed that the drying efficiency was in the range of 22.2% to 31.1%, the specific energy consumption was between 3.475-4.785 MJ/kg H2O evaporated, fuel consumption at 0.95 to 1.15 (liters/hr) and the drying rate was 0.9%/hr.  The entire drying operation using 465 kg of rough rice required 10 hours of drying time with 74.3% of head yield.  Mathematical model used in this study also had indicated close agreement with experimental data.   Key words: re-circulating dryer, pneumatic conveyor, drying performance, tempering period, bio-kerosene blend
PENGARUH PENYUSUTAN TEMU PUTIH (CURCUMA ZEDOARIA (BERG) ROSCOE) TERHADAP KARAKTERISTIK PENGERINGAN LAPISAN TIPIS Tulliza, Inge Scorpi; Tambunan, Armansyah H.; Ahmad, Usman
Jurnal Keteknikan Pertanian Vol. 24 No. 2 (2010): Jurnal Keteknikan Pertanian
Publisher : PERTETA

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Abstract The objective of this study is to analyze the occurrence of shrinkage during thin layer drying of Temu Putih (Curcuma zedoaria (Berg) Roscoe) and its effects to the drying characteristics. The experiments were conducted using a laboratory scale dryer with data acquisition and equipped with machine vision system.The drying conditions was controlled at temperatures (T) of 50°C, 60°C, 70°C,relative humidity (RH) 20%,30%, 40%, 50% and air velocity 0.78 m/s ? 1.95 m/s with a specific combinations. The results show that the temu putih?s slices were shrinking as the moisture content was decreasing with almost linier correlation.The drying data was used to determine the drying constants using three models, namely Henderson andPabis, Lewis, and Page model. The effects of the shrinkage to the drying characteristics is discussed in term of the relation between surface area ratio (AR) to moisture ratio (MR). Keywords: Drying;Thin Layer drying; Shrinkage; Temu Putih Diterima: 24 Maret 2010; Disetujui: 13 September 2010
MANAJEMEN KONSERVASI ENERGI LISTRIK MELALUI PENDEKATAN FINANCIAL ASSESSMENT PADA PT XYZ Mukarom, Ajen; Irwanto, Abdul Kohar; Tambunan, Armansyah H.
Widyariset Vol 17, No 1 (2014): Widyariset
Publisher : LIPI-Press

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Abstract

ThisresearchdiscussestheimplementationofelectricalenergyconservationmanagementatPT XYZ.The method used in this research utilizes measurement, survey, and interview. The data analysis includes descriptive analysis,EnergyConsumptionIntensity(IKE)measurement,identification ofenergysavingopportunities,and financialassessmentanalysisapproach.Theresultsofthisresearchshowthattheusagelevelandelectricalenergy costandIKEvalueon  PTXYZduring2012fluctuatedbuttheytendtodecline,theelectricityqualityofcosphi, electrical current unbalance, electrical frequency, voltage and current harmonic are still quite good.  However, the maximum value of electrical current unbalance exceeds the standard value, mainly in TR2/AC. Based on the observationandmeasurementontheOverallThermalTransferValue,ventilatingandairconditioning,andbuild- ing illumination areal system are suitable to the Indonesia National Standards (SNI). However, there are several ways to achieve the electrical energy conservation in ventilating and air conditioning, and lighting systems.MANAJEMEN KONSERVASI ENERGI LISTRIK MELALUI PENDEKATAN FINANCIALASSESSMENT PADAPTXYZ
Kajian Eksergi pada Mesin Pendingin Adsorpsi Menggunakan Pasangan Silikagel-Metanol Rudiyanto, Bayu; Abdullah, Kamaruddin; Tambunan, Armansyah H.
Agritech Vol 28, No 3 (2008)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (783.047 KB) | DOI: 10.22146/agritech.9777

Abstract

Adsorption refrigeration system (ARS) is one of environment friendly refrigerating machines, which can be operatedby using renewable energy sources available locally such as solar and biomass. The experimental adsorption refrigera- tion system developed in this study utilizes silica gel­methanol combination as the adsorbent and refrigerant which is harmless for human being. The objectives of the research were to identify the performance of adsorption refrigeration system using silicagel­methanol and to conduct exergy analysis of adsorption refrigeration system. The research was started by testing of ARS and than developing energy and exergy balance to determine the exergy loss from the ARS. The results show that the value of exergy loss was obtained for each process in ARS. The exergy loss expresses the most ineffective operation of ARS. The exergy loss in desorption process was found 35.33 Watt (90.57 %). The Condensation process was found 0.2 Watt (0.51 %). The evaporation was found 0.07 Watt (0.18 %) and adsorption process was found1.37 Watt (3.51 %).ABSTRAKSistem pendingin adsorpsi merupakan salah satu dari sistem pendingin yang ramah lingkungan, dimana dalam ope-rasinya sistem ini dapat dibangkitkan menggunakan sumber energi terbarukan seperti biomassa ataupun sinar surya. Sistem pendingin adsorpsi yang digunakan dalam percobaan ini menggunakan pasangan silika gel-metanol sebagai absorben dan refrigeran. Tujuan dari penelitian ini adalah mendapatkan kinerja mesin pendingin adsorpsi intermit- ten pasangan silikagel-metanol dan melakukan analisis eksergi pada mesin pendingin adsorpsi intermitten pasangan silikagel­metanol. Metode penelitian diawali dengan pengujian terhadap kebocoran pada semua komponen di da- lam sistem pendingin adsorpsi dan dilanjutkan dengan pengujian sistem pendingin adsorpsi menggunakan pasangan silikagel­metanol. Suhu tiap komponen yaitu generator, kondensor, evaporator dan pipa­pipa masukan dan keluaran diukur dengan menggunakan termokopel tipe C­C yang dihubungan dengan alat perekam suhu. Sedangkan untuk analisis eksergi diawali dengan perancangan model pada masing­masing komponen dalam sistem pendingin adsorpsi intermitten. Hasil percobaan menunjukkan nilai kehilangan eksergi yang diperoleh untuk tiap proses dalam sistem pendingin adsorpsi. Nilai kerugian eksergi menggambarkan ketidak efektifan proses transfer energi dalam sistem pendinginan adsorpsi. Rincian hasil yang dicapai dari perhitungan dengan analisis eksergi memberikan data pada generator desorpsi kehilangan eksergi (exergy destroy) sebesar 35.33 Watt (90.57 %). Kondensor memberikan nilai sebesar 0.20 Watt (0.51 %). Evaporator memberikan nilai sebesar 0.07 Watt (0.18 %) dan pada generator adsorpsi memberikan nilai sebesar 3.51 %.
Penentuan kondisi proses pengeringan temu lawak untuk menghasilkan simplisia standar Manalu, Lamhot P.; Tambunan, Armansyah H.; Nelwan, Leopold O.
Jurnal Dinamika Penelitian Industri Vol 23, No 2 (2012): JURNAL DINAMIKA PENELITIAN INDUSTRI
Publisher : Balai Riset dan Standardisasi Industri Palembang

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The purpose of this research was to study the effect of drying conditions on the simplicia quality of java turmeric (Curcuma xanthorrhiza Roxb.) and determine the best conditions to make standardized simplicia. There are some criteria such as the conditions which can reach the standard moisture content of 10%, drying time is relatively fast, the result of dried simplicia still contains high level of curcumin, optimum shrinkage and good visual appearance. The results showed that the final moisture content can not reach 10% at the drying temperatures below 50 °C and RH above 40%. The average surface area shrinkage during the drying process crude ginger was 66.2%. There is a tendency of the lower temperatures and higher RH drying the higher levels of curcumin. Drying condition for Java turmeric recommended by this research is at a temperature of 50 °C and 30% RH.Keywords : Curcumin, drying, java turmeric, quality standardAbstrakTujuan penelitian ini adalah untuk mempelajari pengaruh kondisi proses pengeringan terhadap mutu simplisia temu lawak (Curcuma xanthorrhiza Roxb.) dan menentukan kondisi proses pengeringan terbaik untuk menghasilkan simplisia standar. Kriteria kondisi tersebut adalah yang dapat memenuhi kadar air standar 10%, waktu pengeringan yang relatif cepat, hasil pengeringannya masih mengandung kadar kurkumin yang tinggi dan penyusutan serta tampilan visual yang optimal. Hasil studi menunjukkan bahwa pada kondisi pengeringan di bawah suhu 50 oC dan RH diatas 40% kadar air akhir temu lawak tidak dapat mencapai kadar air standar. Rata-rata penyusutan luas permukaan simplisia temu lawak selama proses pengeringan adalah 66,2%. Terdapat kecenderungan semakin rendah suhu dan semakin tinggi RH pengeringan maka semakin tinggi kadar kurkumin simplisia temu lawak. Kondisi proses pengeringan simplisia temu lawak yang direkomendasikan adalah pada suhu 50 oC dan RH 30%.Kata kunci : Kurkumin, mutu, pengeringan, standar, temu lawak
ANALISIS ENERGI DAN EKSERGI PENGERINGAN LAPISAN TIPIS TEMU PUTIH Manalu, Lamhot P.; Tambunan, Armansyah H.; Nelwan, Leopold O.; Hoetman, Agus R.
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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This paper is concerned with the energy and exergy analyses of the thin layer drying process of temu putih (Curcuma zedoaria (Berg.) Rosc) at three different air temperatures (40, 50 and 60 oC) and air relative humidities (RH 20%, 40% and 60%) using a laboratory dryer. Using the first law of thermodynamics, energy analysis was carried to estimate the amounts of energy gained from air drying and the ratios of energy utilization. However, exergy analysis was accomplished to determine exergy losses and exergy efficiencies during the  drying process by applying the second law of thermodynamics. The values of energy and exergy efficiencies were found to be in the range of 23.5 - 49.1% and 3.8-14.1% from 40 to 60 oC, respectively,  while from RH 20% to 60% its values are 48.4-62.8% and 13.6-14.6%, respectively.
PENGARUH RECEIVER TERHADAP KINERJA REFRIGERASI MESIN PEMBEKU Sukusno, Paulus; Tambunan, Armansyah H.; Setiawan, Radite Praeko Agus; Purwanto, Yohanes Aris
Jurnal Keteknikan Pertanian Vol. 6 No. 3 (2018): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

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AbstractFreezing is the best method to preserve the quality of food for a long period of time compared to other technologies such as drying and canning. Technology of freezing requires more energy than other preservation technologies, however. Therefore, an energy efficient freezer is needed. This research aims to the effect of utilization of a receiver to improve the freezer performance efficency. The research is conducted on freezer used to cool and freeze 1 kg of water from a temperature of 27oC to -14oC, then a receiver is installed in the freezer and the same research is conducted (the type and setting of expansion valve and test materials are the same). The refrigerant medium is R404A working fluid. The receiver is installed between condenser and filter dryer in the system circuit of the freezer. The result shows that the utilization of receiver increases the coefficent of performance (COP) from 2.24 to 2.69 and reduce the electricity consumption. The time required for freezing becomes shorter particularly on the transition of liquid to solid phase (ice) . Consequently, the freezing rate becomes quicker and provides advantages for application of food freezing.AbstrakPembekuan merupakan metode yang paling baik untuk menjaga kualitas makanan dalam jangka waktu lama, dibanding dengan teknologi lain seperti pengeringan dan pengalengan. Namun teknologi pembekuan membutuhkan lebih banyak energi daripada teknologi pengawetan lainnya, karena itu diperlukan mesin pembeku yang hemat energi. Penelitian ini bertujuan untuk mempelajari pengaruh penggunaan receiver untuk meningkatkan efisiensi kinerja mesin pembeku. Penelitian dilakukan pada mesin pembeku yang digunakan untuk mendinginkan dan membekukan air 1 kg dari suhu 27oC sampai -14oC, selanjutnya penelitian mesin pembeku ditambahkan receiver dan dilakukan penelitian yang sama (bukaan katup ekpansi diatur tetap dan sama, serta bahan uji dilakukan dalam kondisi sama). Media pendingin menggunakan fluida kerja R404A. Receiver diletakkan di antara kondensor dan filter dryer pada rangkaian sistem mesin pembeku. Hasil penelitian menunjukkan bahwa penggunaan receiver pada mesin pembeku berdampak pada peningkataan koefisien kinerja (COP) dari 2.24 menjadi 2.69, dan terjadi penghematan konsumsi energi listrik. Waktu proses pembekuan menjadi lebih singkat, khususnya pada tahap perubahan fase cair menjadi es, sehingga laju pembekuan menjadi lebih cepat dan memberi keuntungan untuk penerapan pada pembekuan bahan pangan.
FISH IS A PERISHABLE PRODUCT, AND THEREBY NEEDS A SPECIAL TREATMENT TO PROLONG ITS SHELF LIFE. TRADITIONALLY, DRYING IS A COMMON TREATMENT FOR THE PURPOSE, ESPECIALLY BY USING SUN DRYING. THIS PAPER IS DEVOTED TO THE STUDY OF HISTIOPHORIDAE FISH  DRYING USING A TRUNEATED  TRAPEZOIDALLY SHAPED GREEN HOUSE EFFECT SOLAR DRYER  IN ORDER TO MAXIMIZE THE  USE OF SOLAR ENERGY. THE DRYING SYSTEM USED DIFFERENT SIZE OF RACKS AND TRAY FOLLOWING THE DIMENSION OF THE STRUCTURE SO AS TO MINIMIZE EMPTY SP Nababan, Binsar; Abdullah, Kamaruddin; Tambunan, Armansyah H.; Soepardjo, A Harsono
Forum Pasca Sarjana Vol. 30 No. 1 (2007): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Fish is a perishable product, and thereby needs a special treatment to prolong its shelf life. Traditionally, drying is a common treatment for the purpose, especially by using sun drying. This paper is devoted to the study of histiophoridae fish  drying using a truneated  trapezoidally shaped green house effect solar dryer  in order to maximize the  use of solar energy. The drying system used different size of racks and tray following the dimension of the structure so as to minimize empty space.  The dryer was   equipped with 25  watt DC blowers to remove  the moist air.  From two experimental runs, the results show that the system can properly dry the histiophoridae fish to its desired moisture content, which ranged from 30.08% (wb) to 32.80% (wb).  Utilization of the truneated  trapezoidally shaped green house effect solar dryer was found to be effective in enhancing the absorbtion of solar irradiation not only by the heat absorber but also by the producs on speated the vertically arranged racks. Solar PV modules were used to power inlet  exhaust fans as well as for temperature control. A PCM energy storage was also provided to provide heating  during night time.   Keywords: fish drying, trapezoidal shape green house, solar drying, PCM heat  storage, PV modul temperature control