Microwave drying kinetics of jack pine wood: determination of phytosanitary efficacy, energy consumption, and mechanical properties

Ouertani, Sahbi; Koubaa, Ahmed; Azzouz, Soufien; Bahar, Rim; Hassini, Lamine; Belghith, Abdelfettah

doi:10.1007/s00107-018-1316-x

Cited by 23 publications

(40 citation statements)

References 52 publications

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“…Semakin tipis rumput laut maka MR akan semakin rendah, karena air dalam bahan lebih mudah menguap. Quertani et al (2018); Jiang, Dang, Tan, Pan, dan Wei (2017) mengemukakan, dalam pengeringan menggunakan gelombang mikro, uap air yang dihasilkan gelombang elektromagnetik akan mudah melewati permukaan bila bahan yang dikeringkan memiliki ketebalan lebih kecil sehingga proses evaporasi berjalan cepat.…”

Section: Effect Of Different Thickness On Temperature and Weight Deunclassified

Performa dan Analisis Konsumsi Energi Pengeringan Rumput Laut Menggunakan Energi Gelombang Mikro

Hakim¹,

Handoyo²,

Prasetyo³

2020

JPBKP

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Pengeringan menggunakan energi gelombang mikro menjadi alternatif agar pengeringan berjalan lebih cepat tanpa terpengaruh kondisi cuaca. Namun performa dan efisiensi energi dalam mengeringkan rumput laut belum diketahui. Tujuan penelitian ini adalah untuk mengetahui performansi pengeringan rumput laut menggunakan energi gelombang mikro (microwave) dan analisa konsumsi energinya. Metode yang digunakan ialah mengeringkan rumput laut segar dalam oven gelombang mikro secara batch. Dalam proses pengeringan dilakukan variasi level daya (400, 500, 600 watt) ke dalam oven gelombang mikro dan variasi ketebalan rumput laut (3, 5, 7 cm). Parameter yang diamati meliputi rasio kadar air (moisture ratio/MR), laju pengeringan (g/menit), difusi efektif air/Deff (mm2/detik), specific energy consumption/SEC (J/g H2O) dan efisiensi energi (%). Hasil penelitian menunjukkan, level daya magnetron 600 watt menghasilkan MR terendah (0,19), laju pengeringan tertinggi (13,15 g/menit) dan Deff tertinggi (2,28 x 10-2 mm2/detik). Rumput laut ketebalan 3 cm memperoleh MR terendah (0,05), laju pengeringan tertinggi (6,42 g/menit) dan Deff tertinggi (9,42 x 10-2 mm2/detik). SEC pengeringan sebesar 4,38-4,51 J/g H2O dan efisiensi energi 22,56-23,42% untuk level daya 400-600 watt. Perbedaaan level daya tidak memberikan pengaruh signifikan terhadap SEC dan efisiensi. Sedangkan variasi ketebalan rumput laut antara 3 cm dan 7 cm memberi hasil yang berbeda. SEC terendah diperoleh pada perlakuan rumput laut tebal 3 cm yaitu 2,96 J/g H2O sementara efisiensi tertinggi pada rumput laut dengan tebal 5 cm yaitu 22,93%.Oleh karena itu pengeringan rumput laut menggunakan energi gelombang mikro dengan level daya 600 watt dan ketebalan 3 cm menghasilkan performasi dan konsumsi energi yang lebih baik. AbstractMicrowave drying becomes alternative method to get faster process without being influenced by weather. However performance and energy efficiency of microwave drying for seaweed are still unknown. This research aims to find out performance of seaweed drying in microwave oven as well as energy consumption analysis. The method used was drying seaweed in microwave oven. Seaweed drying was conducted at various power level (400, 500, 600 watt) and thickness of seaweed (3, 5, 7 cm). Observed parameters were moisture ratio/MR, drying rates (g/min), effective diffusion/Deff (mm2/s), specific energy consumption/SEC (J/g H2O) and energy efficiency (%). Result of research showed that power level, 600 watt of magnetron produced lowest MR (0,19), highest drying rate and Deff i.e 13.15 g/min and 2.28 x 10-2 mm2/s respectively. Seaweed 3 cm thickness achieved lowest MR (0.05), highest drying rates 6.42 g/min and Deff 9.42 x 10-2 mm2/s. SEC of drying were 4.38-4.51 J/g H2O while energy efficiency were 22.56-23.42 % for 400-600 watt. Differences of power level have not given significant effect to SEC and efficiency values. Whereas differences of seaweed thickness between 3 cm and 7 cm have given significant effect. Seaweed in 3 cm thickness resulted in the lowest SEC i.e 2.96 J/g H2O, however, the highest efficiency energy was 5 cm thickness i.e 22.93%. Therefore drying seaweed utilize microwave energy of 600 watt power level and 3 cm thickness generated better performance and energy consumption.

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Section: Effect Of Different Thickness On Temperature and Weight Deunclassified

Performa dan Analisis Konsumsi Energi Pengeringan Rumput Laut Menggunakan Energi Gelombang Mikro

Hakim¹,

Handoyo²,

Prasetyo³

2020

JPBKP

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“…The more considerable power of microwave leads to rapid mass transfer due to more heat generated in the sample, creating a large vapor pressure differential between the center and the material's surface. Ouertani et al (2018) reported that increasing the power level of magnetrons enhances the material's internal gas pressure, forming a narrow space with radial orientation. Such an application also influences the structure of a material by gaining liquid and gas permeability.…”

Section: Moisture Ratiomentioning

confidence: 99%

“…However, at four very high since the applied frequency was 2.45 GHz, which means that molecules rotated 2.45 x 10 9 times per second. High rotation generates friction between water molecules, producing heat (Hakim et al, 2020b;Rattanadecho & Makul, 2016). It happens when wet or fresh material contains a bipolar molecule.…”

Section: Moisture Ratiomentioning

confidence: 99%

Design and Performance of Scaled-Up Microwave Dryer for Seaweed Drying

Hakim

Handoyo

Prasetya

2020

Squalen Bull. Marine Fisheries Postharvest Biotech.

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Direct sunlight is commonly used to dry fresh seaweed by artisanal farmers in Indonesia due to its low cost and ease of handling. Nevertheless, this method poses some drawbacks such as lengthy duration, weather dependency and quality degradation. The application of microwave technology in food processing has progressed dramatically, including in the drying process. The microwave drying method is more efficient and can shorten the processing time. This study aimed to describe a large-scale microwave dryer (MD) design and performance to assist the fresh seaweed drying process. The design concept applies microwave energy with a volumetric heating feature to accelerate the seaweed drying process without damaging its functional groups. The MD dimensions were 2410 (l) x 270 (w) x 210 (h) mm with a dryer capacity of up to six kilograms, an enlarged cavity and multiple magnetrons. The main components of the MD were cavity, air circulation system, drying system and control system. According to the performance testing, the MD’s optimum performance was at a power level setting of P7 and six kilograms load. At this setting, we obtained a dried seaweed with a moisture ratio of 0.68±0.05, drying rate of 30.29±1.32 g/min, specific energy consumption of 3.96±0.08 MJ/kg H2O and energy efficiency of 58.45±2.65%. The total power of the P7 setting operation required 2.00 kW. Fourier-Transform Infrared (FTIR) spectra showed that the functional groups of the dried seaweed were unaltered.

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“…Extensive experimental results on the topic [1][2][3][4] were obtained earlier, the present study is based on them, but known statistics will not be enough to derive a moisture model. A review of some foreign studies [1,[5][6][7][8][9][10][11][12][13][14][15][16][17] shows a similar picture, but no results have been obtained for practical application in intelligent control systems. In this case, solving problems of this class is possible using the TFS (theory of fuzzy sets) apparatus, which should determine the relevance, goals and objectives of modern research.…”

Section: )mentioning

confidence: 99%

“…This direction is knowledge-intensive and high-tech. The aim of the study [16] was to determine the effect of microwave irradiation on the kinetics of the wood drying process, phytosanitary efficiency and energy consumption for processing, as well as to evaluate the mechanical strength of the dried product. For conditions at a frequency of 2.45 GHz and with radiation power in the range from 300 to 1000 W, a picture of the dependence of speed, drying time and energy consumption on the radiation power, initial temperature of the wood and the geometry of the sample was experimentally obtained.…”

Section: A Review Of Literature On the Topic Of Wood Dryingmentioning

confidence: 99%

Fuzzy Modeling in the Management of the Lumber Drying Process: Formalization of uncertainties in the problem

Gorokhovsky¹,

Pobedinsky²,

Gorokhovsky³

et al. 2018

International Scientific and Practical Conference "AgroSMART - Smart Solutions for Agriculture" (AgroSMART 2018)

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The problem of lumber drying is considered. The relevance of the research is due to the need to improve the system of automated control of the technological process of drying lumber on the basis of modern information technologies, reducing the energy-intensity of these technologies, which is enshrined in the program documents of forest industry development at the governmental level. It is shown that the most effective solution will be the use of fuzzy modeling. In this case, the characteristics of the uncertainty of the input parameters and the influencing factors will be taken into account. The functional purpose of the automated control system is to provide a given level of moisture content of wood with the required quality of wood (exclusion of damage). It is extremely difficult to obtain such a functional dependence on the heating temperature in the drying chamber and equilibrium air humidity by traditional statistical methods due to the uncertainty of the parameters, therefore, the apparatus of the theory of fuzzy sets should be used for this task. The purpose of this work was to analyze researches in the field of lumber drying and substantiate the meaningful formulation of the problem of moisture content and lumber drying time modeling. The methodological basis of theoretical studies were: the drying theory, wood science, apparatus of mathematical and fuzzy modeling. The result of the research is the substantiation of the meaningful formulation of tasks of fuzzy modeling of the humidity and lumber drying time. The scientific novelty of research follows from the proposed theoretical approach to estimating the parameters of moisture content and drying time of lumber on the basis of fuzzy modeling. The practical applicability of the results lies in the possibility of using the developed problem statement for fuzzy inference of the functional dependence of the control of drying of materials.

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Microwave drying kinetics of jack pine wood: determination of phytosanitary efficacy, energy consumption, and mechanical properties

Cited by 23 publications

References 52 publications

Performa dan Analisis Konsumsi Energi Pengeringan Rumput Laut Menggunakan Energi Gelombang Mikro

Performa dan Analisis Konsumsi Energi Pengeringan Rumput Laut Menggunakan Energi Gelombang Mikro

Design and Performance of Scaled-Up Microwave Dryer for Seaweed Drying

Fuzzy Modeling in the Management of the Lumber Drying Process: Formalization of uncertainties in the problem

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