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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 tha Totok Prasetyo; Kamaruddin Abdullah; Armansyah H. Tambunan; Leopold Nelwan; I Made K.D
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

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. Binsar Nababan; Kamaruddin Abdullah; Armansyah H. Tambunan; A Harsono Soepardjo
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

Penentuan kondisi proses pengeringan temu lawak untuk menghasilkan simplisia standar Lamhot P. Manalu; Armansyah H. Tambunan; Leopold O. Nelwan
Jurnal Dinamika Penelitian Industri Vol 23, No 2 (2012): JURNAL DINAMIKA PENELITIAN INDUSTRI
Publisher : Balai Riset dan Standardisasi Industri Palembang

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

Application of Evaporative Cooling System for Post Harvest Handling of Agricultural Products Armansyah H. Tambunan; Hedi R. Rismawan; Isabella Silalahi
Jurnal Keteknikan Pertanian Vol. 13 No. 1 (1999): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.013.1.%p

Post harvest handling and treatment of agricultural prodz~ct isextremely important in maintaining all of the possible qzralify of the prodzilrct. Most of the product needs to be handled and treated at low temperature. Duly. a cheap and easy-to-handle cooling facility is very important to be provitied nearer to producer's/ farmer's location. The objectives of the experiment were to design and evaluate the performance of an evaporative cooling system, uwd to develop a simulation model for predicting the performance and temperature distribution inside the storage room. Experimental data showed that the performance of the design was fairly good and acceptable. The cooling system could keep the temperature of product under ambient temperature, although the optimal temperaturecouldn't be reached. Performance of the design could be increased by improving the performance of nozzle, fan and the insulation system of the storage wall.

Study on Energy Consumption For Soybean-Sauce Production 'Pabrik Kecap Zebra' Ciampea, Bogor . Sonhaji; Armansyah H. Tambunan
Jurnal Keteknikan Pertanian Vol. 13 No. 3 (1999): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.013.3.%p

Energy is an Important factor for the success of industrialitation. and energy consumption of an industry. especially the small and medium industry. should be optimized based on the energy efficiency system. The objective of this research is to analyse the energy consumption for soybean sauce production at 'Pabrik Kecap Zebra'. Ciampea Bogor. and to evaluate the efficiency of stoves used at the industry.

Faktor Influencing the Vacuum Freezing Rate of Liquid Food Armansyah H. Tambunan
Jurnal Keteknikan Pertanian Vol. 14 No. 3 (2000): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.014.3.%p

Many,freezing methods, mechanicul as well as cryogenic, have been in wide application in food industries. Each method has its own advantage, but in regard with the food quality, freezing rule can be accomplished by the method is one of the tnost important factors. Nowadays, many researchers are conducting experiment in order to enhance thefi.eezing rate. This paper deals with the advantage of vacuum freezing method in enhancing the freezing rate and its applicability for liquidfood.Experinrent was carried out for distilled water, milk, and fruit juice using multi-purpose vacuum equipment. As easily predicted, minimum pressure of the freezing chamber determine temperature of the product. Vuriation on the fruit juice concentration shows that faster freezing rate canbe achieved if the product is more dilute. The experiment also showed that freezing rute obtained by vacuumj-eeziirg was signijkantly faster than contact plate freezing method.

Vacuum Freezing Characteristics of Passion Fruit Armansyah H. Tambunan; Ainun Rohanah; Y. Aris Purwanto
Jurnal Keteknikan Pertanian Vol. 17 No. 1 (2003): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.017.1.%p

Pemilihan metode pembekuan merupakan salah satu aspek penting, khususnya dari sisi keteknikan. Pembandingan karakteristik pembekuan dan mutu produk yang dibekukan dengan berbagai metoda dapat digunakan untuk keperluan tersebut. Tujuan penelitian ini adalah untuk melakukan perbandingan karakteristik pembekuan antara metoda pembekuan vakum dan metoda pembekuan lempeng sentuh. Bahan yang dibekukan adalah pulp markisa. Parameter banding yang digunakan adalah profil dan sebaran suhu bahan, laju pembekuan, konsumsi energi dan parameter mutu seperti warna, kadar air, kandungan protein dan kandungan vitamin C.

Simulation Study on Freeze-drying Characteristics of Mashed Beef Armansyah H. Tambunan; M. Solahudin; Estri Rahajeng
Jurnal Keteknikan Pertanian Vol. 14 No. 1 (2000): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.014.1.%p

Drying characteristic of a particular product is important in analyzing the appropriateness of the drying method for the product. This is especially important for freeze drying, which is known as the most expensive drying method, asideji-om its good drying quality. The objectives of this experiment are to develop a computer simulation program using a retreating drying-frontmodel for predicting freeze drying characteristics of mashed nteat, especially for the influence of sublimation temperature and thermal conductivity.

The Influence of LRC Current from the Q-Meter to the Measured Value of Dielectric Properties Within Radio Frequency Range Harmen .; Armansyah H. Tambunan
Jurnal Keteknikan Pertanian Vol. 17 No. 1 (2003): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.017.1.%p

Various measurement method of dielectric properties has been studied by researches, one of wich is the Booton 160-A Q-meter operated within the radio frequency range. Determination of dielectric properties by the Q-meter is accomplised through the measurement of voltage (Q) and capacitance (C) of the LRC, which is naturally in the form of alternating current (AC). Measurement of the AC voltage by a voltmeter shows instability of the measured value, while using an osciloscope require an expensive apparatus. The problem seems can be solved by convertion of the LRC output from alternating to direct current. This paper is to study the influence of LRC output to the measured dielectric properties, by converting the output from alternating to direct current.

Design and Performance Test of Measuring Apparatus of Dielectric Properties Using Q-Meter Method Armansyah H. Tambunan; Nugroho A. Suyanto; . Harmen
Jurnal Keteknikan Pertanian Vol. 14 No. 2 (2000): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.014.2.%p

Dielectric heating has received a lot of attention recently. Microwave heating, however, has the problem of noticeable hot and cold spots within a food. Radio frequency (RF) has the potential to overcome this problem because of its longer wavelength and greater penetration depth, which would lead to more uniform distribution of the electric field and thus a more uniform temperature distribution. The dielectric properties are the measure of a sample's response to an electromagnetic field, which vary significantly with frequency, temperature, moisture, and salt content. The potential of a medium to respond to dielectric heating can be characterized by its dielectric properties, which can be strong functions of frequency and temperature. This experiment is aimed to design and test the performance of a measurement apparatus for the dielectric properties, using the Q-meter method.

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