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Penerapan Energi Terbarukan untuk Proses Thermal Bagian I. Pengeringan Hasil Pertanian Kamaruddin Abdullah; Armansyah H Tambunan; Harsono Soepardjo
Jurnal Ilmu Pertanian Indonesia Vol. 13 No. 1 (2008): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Study on thermal processes using renewable energy sources for drying and cooling purposes hasc been selected due to their importance in extending shelf life of agro and marine products which arc susceptible to high temperature and humidly under the tropical climatic conditions. The unavailability of these facilities had resulted in significant amount post harvest which sometime may reached up to 30% of harvest. This research was aimed to determine the proper design and construction of renewable energy conversion, namclyt, solar, wind and biomass to generate thermal energy for drying and cooling of agricultural and marine produccts. Both processes could also be used as the main component of a Small Processing Unit (SPU), an early form of SME and cooperative at village level. This paper will discuss Part I of the study which will be focused on the application of renewable energy sources for the drying of agricultural products. The following conclusions had been achieved. a). Study on simultaneous momentum, energy and mass transfer in thin layer drying process of rough rice have provided information on air temperature, velocity and RH distribution above the grain. b). A novel ventury type CIIE solar dryer with solar PV power supply and PCM energy storage, has been successfully designed and constructed. Test results have shown that the dryer could he used to dry 75-95kg of fish within 36 to 40 hrs. wirh apparent PCM energy storage of 6.9M.J (6 hrs. drying time). c). Mathematical modelling and simulation of a biomass stove heated recirculation dryer indicated that drying of rough rice could be completed within 3-6hrs (1.8-3.7T.hrs-1 recirculation rate with one hour tempering time) if 2 HP blower is used. Keywords : energy storage, momentum and mass transfer, recirculation dryer, renewable energy conversion, simultaneous energy

Freeze drying of food materials is a time and energy consuming process, hence a high cost process. The drying rate is limited by heat and mass transfer process within the dried portion of the product. In order to improve the freeze drying performance, it is important to know parameters which affect the drying characteristics of each spesific food material, in regard to the drying time and the energy consumption. The objective of this experiment was to study the freeze drying characteristic of mi Yulia Lisnawati; Armansyah H Tambunan
Jurnal Keteknikan Pertanian Vol. 11 No. 1 (1997): Buletin Ketenikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.011.1.%p

Freeze drying of food materials is a time and energy consuming process, hence a high cost process. The drying rate is limited by heat and mass transfer process within the dried portion of the product. In order to improve the freeze drying performance, it is important to know parameters which affect the drying characteristics of each spesific food material, in regard to the drying time and the energy consumption. The objective of this experiment was to study the freeze drying characteristic of miched beef especially the effect of freezing rate and surface temperature of the material to the drying time. The study was conducted with freezing rate at 7.71 cmhours and 1.94 cmhours which are classified into fast and slow freezing rate, while the surface temperature of the material was controlled at 40 OC, 35 OC, and 30 OC. The experimental results confirmed that the faster freezing rate then the longest drying time, while the higher surface temperature give a shorter drying time of miched beef. It is important to determine the optimal freezing rate and surface temperature from the view point of energy consumption.

The ratio of specifc heat capacity, at constant presszrre to that at constant volume (cdc,J, of a gas can be determined by either the adiabatic expansion method or the sound velocity method. The objective of this experiment is apply the adiabatic expansion method for determining the spec$c heat capacity ratio of gas N2 and O2 The result showed that the ratio were 1.14 and 1.19 respectively for gas N2 and 02.T he value obtained by the experiment was d~flerenta bout 15 to 19% from the result deter Wiludjeng Trisasiwi; Dyah Wulandani; Kamaruddin Abdullah; Armansyah H Tambunan
Jurnal Keteknikan Pertanian Vol. 12 No. 2 (1998): Buletin Ketenikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.012.2.%p

The ratio of specifc heat capacity, at constant presszrre to that at constant volume (cdc,J, of a gas can be determined by either the adiabatic expansion method or the sound velocity method. The objective of this experiment is apply the adiabatic expansion method for determining the spec$c heat capacity ratio of gas N2 and O2 The result showed that the ratio were 1.14 and 1.19 respectively for gas N2 and 02.T he value obtained by the experiment was d~flerenta bout 15 to 19% from the result determined by theoretical method using 5 degree of Jkeedom. Theoretically cdc,, of both gas N2 and 0 2 which have 5 degree offreedom are 1.4. The dzflerence was considered to be caused by thee xperimental condition, which were not suflciently adiabatic, as required by the method. However, the simplicity of the method and clarity of its theoretical approach is advantageous to be used by students of Advance Thermodynamic class as a practical exercise.

Analisis Biaya Produksi Pelet Kayu (Cost Analysis of Wood Pellet Production) Bintang CH Simangunsong; Karina A Wilma; EG Togu Manurung; Vera J Sitanggang; Armansyah H Tambunan
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 15, No 1 (2017): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Eco-friendly renewable energy such as wood pellet is necessary to replace fossil fuels. Hence, the wood pellet industry has been rapidly developed, particularly, in European and America countries. To capitalize a high demand of wood pellet in those countries, Indonesia’s wood pellet companies need analysis tools to make decision on management and operation of their wood pellet production such as productivity, efficiency, production cost and and profitability assessments. The objectives of this study were to analyze cost, break-event point and profitability of wood pellet production. This study was conducted at a large integrated wood based panel and wood working products company, which produces wood pellet from its forest products residues. The results showed that the production cost was about IDR 1.41 millions per ton or US$ 114 per ton. The break-even point was about 1400 tons per year or about 84.7% of actual production. The return on investment (ROI) was about 14.15 %, which was slightly higer than a lending rate of 10.25%.Key words: energy, production cost, profitability, wood pellet, wood residues

Analisis Levelized Cost of Energy Pelet Kayu (Levelized Cost of Energy Analysis of Wood Pellet) Bintang CH Simangunsong; Ganesha SJ Silalahi; Mohammad DG Maulana; Elisa GT Manurung; Vera J Sitanggang; Armansyah H Tambunan
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 15, No 2 (2017): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The availability of fossil energy resources as an input of production is limited and eventually will be rare. One of potential alternative energy that is recently developed to partly substitute fossil fuels based energy is wood pellet. The objective of this research was to analyze the levelized cost of energy (LCoE) of wood pellet made from wood processing residues. LCoE was the minimum energy prices that should be sold for an energy project to break even. The LCoE of wood pelet was obtained about IDR 259 per kWh or USD 0.02 per kWh. This LCoE value is lower than the LCoE of fossil fuels. It is indicating that energy derived from wood pellet is a very competitive.Keywords: LCoE, renewable energy, wood pellet, wood industry, wood residues

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