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All Journal JURNAL SAINS DAN TEKNOLOGI INDONESIA Jurnal Keteknikan Pertanian Jurnal Teknologi Pertanian Jurnal Dinamika Penelitian Industri Jurnal Teknologi Energi
Lamhot P. Manalu
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Agriculture, Biological Sciences & Forestry Computer Science & IT Education Energy Industrial & Manufacturing Engineering

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Penentuan sifat termofisik (Thermophysic Properties) temu lawak dan temu putih Lamhot P. Manalu
Jurnal Dinamika Penelitian Industri Vol 22, No 2 (2011): JURNAL DINAMIKA PENELITIAN INDUSTRI
Publisher : Balai Riset dan Standardisasi Industri Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2162.062 KB) | DOI: 10.28959/jdpi.v22i2.542

Abstract

The most important limitation in process design for agricultural products is the lack of information on their thermal properties. Although a lot of experimental data can be found, the variety of products and the differences in measurement method make limitation on the value of the available data, especially for Indonesia’s products. These data are needed to get information about temperature change when product was processed like heating or cooling. It is worth due to optimizing the efficiency of energy. The objective of this study isto determine thermal diffusivity and conductivity of java turmeric and zedoary herbs. The values were determined numerically with indirect methods. The result shows that thermal conductivity of java turmeric and zedoary are 0.2797 W/moC and 0.1359 W/moC, respectively, while thermal diffusivity are 9.34x10-8 m2/s and 1.00x10-7 m2/s, respectively.Keywords : thermal properties, java turmeric, zrdoary, thermal conductivity, thermal diffusivity AbstrakDalam merancang suatu sistem proses dan peralatan pengolaan hasil pertaniandiperlukan pengetahuan tentang sifat-sifat panas suatu bahan diantaranya panas jenis, konduktivitas dan difusivitas panas. Nilai-nilai tersebut untuk produk pertanian lokal sangat jarang ditemukan, sehingga dalam aplikasinya sering digunakan data sifat panas dari literatur luar yang belum tentu sesuai dan tepat dengan produk dalam negeri, hal ini dapat menyebabkan terjadinya bias dalam perhitungan dan perancangan. Studi ini bertujuan untuk menentukan sifat-sifat/properti panas dari tanaman obat temu lawak dan temu putih. Hasil studi mendapatkan bahwa nilai panas konduktivitas panas temu lawak dan temuputih masing-masing adalah 0.2797 W/moC dan 0.1359 W/moC, sedangkan nilai difusivitas panasnya masing-masing adalah 9.34x10-8 m2/detik dan 1.00x10-7 m2/detik.Kata Kunci : sifat panas, temu lawak, temu putih jenis, konduktivitas, difusivitas panas
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3157.131 KB) | DOI: 10.28959/jdpi.v23i2.611

Abstract

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
SISTEM PENGONTROLAN KONDISI UDARA PADA ALAT PENGERING TERKENDALI Lamhot P. Manalu
Jurnal Dinamika Penelitian Industri Vol 21, No 2 (2010): JURNAL DINAMIKA PENELITIAN
Publisher : Balai Riset dan Standardisasi Industri Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8524.308 KB) | DOI: 10.28959/jdpi.v21i2.3170

Abstract

A microprocessor-based laboratory dryer system was constructed to control experimental conditions in the study of the moisture content of agricultural products and medicinal plants (simplicia). The equipment also recorder the condition of the air and the sample weights during the thin-layer drying tests for these products. This paper describes the hardware and software which were developed for use in the study of drying properties of various products. Two condition process variables are controlled simulataneously: the humidity and temperature of the air in drying chamber with temperature accuracy of ± 1 oC and relative humidity accuracy of ± 2%. The drying conditions were held constant and the variation in conditions in the drying chamber was shown to have no measurable effect on the thin-layer drying process subject to requirement of ASABE standard.
Performance of Pepper Post Harvest Machines Wahyu Purwanto; Lamhot P. Manalu
Jurnal Keteknikan Pertanian Vol. 16 No. 1 (2002): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.016.1.%p

Abstract

The purpose of this study was to learn technical performance and financial feasibility of a unit of mechanical post-harvest processing of pepper. The equipment used in such a process is thresher, peeler and dryer. The equipment was tested to learn its technical performances. It was found that the threshing efficiency of the thresher was 98% with a capacity of 269 kg fresh pepper spikes per hour and damaged berries of 5.3%. The peeling efficiency of the peeler was 98% with an optimum capacity (in term of fresh pepper spikes) of 224 kg per hour.The financial analysis showed that a unit of mechanical post-harvest processing of pepper with a capacity of 30,000 kg per year needs an investment of Rp. 82,060,000.00. This investment wi/l give an NPV of Rp. 141,605,144; net BIC of 2.37 and IRR value of 81.33%. An intensive and local specific study must be carried out to get appropriate conclusions of such an analysis.
Desorption Equilibrium Moisture Content Isotherm of Corn Lamhot P. Manalu
Jurnal Keteknikan Pertanian Vol. 15 No. 1 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.1.%p

Abstract

The concept of equilibrium moisture content or EMC is important in study of storage. The EMC of cereal grain is defined as the moisture content' of the material after it has been exposed to a particular environment for an infinitely longperiod of time. The EMC is dependent upon the humidity and temperature conditions of the environment.The more important limitation in process design for agricultural products is the lack of exprimental data can be found. The variety of products and the differences in measurement method make limitation on the valueof the available data, especially for Indonesian's products. The data are needed to get information about moisture content change when product was processed like storage or drying.The objective of this research is to determine the EMC equation models of local corn with the static method. The result indicates that Chung-Pfost and polynomial models are better reprentative to predict the EMC than Henderson's.
Co-Authors Agus R. Hoetman Amos ., Amos Armansyah H. Tambunan Armansyah H. Tambunan Cakranegara, Pandu Adi Jamhari Jamhari Jusuf Jakfar, Jusuf Leopold O. Nelwan Leopold O. Nelwan Tri Yogo Wibowo