Treatment design of radio frequency heating based on insect control and product quality

Wang, S.; Yue, Jiguang; Chen, B.; Tang, Juming

doi:10.1016/j.postharvbio.2008.02.004

Cited by 54 publications

(5 citation statements)

References 19 publications

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“…The time required for the temperature to rise from 24.0°C to 48.0°C were 2.8, 4.6, and 8.1 min and the RF heating rates were 8.6°C, 5.2°C, and 3.0°C min -1 for electrode gaps of 13, 14, and 15 cm, respectively. Shorter RF heating time was obtained by using smaller electrode gaps, resulting in higher throughput but relatively poor heating uniformity due to high heating rates, as observed by Wang et al (2008b). To obtain relatively high throughput with acceptable heating uniformity in industrial applications, an electrode gap of 14 cm (about 1 kW of RF power) and heating rate of 5.2°C min -1 were considered as operational parameters for further RF treatment protocol development.…”

Section: Determination Of Electrode Gap and Heating Ratementioning

confidence: 99%

“…Heating uniformity in RF-treated samples is important to achieve effective treatments that ensure insect control and provide acceptable product quality (Wang et al, 2008a(Wang et al, , 2008bTiwari et al, 2011). Many practical methods are used to improve the uniformity of RF heating in agricultural products (Birla et al, 2004;Wang et al, 2006;Tiwari et al, 2008;Sosa-Morales et al, 2009;Gao et al, 2010).…”

mentioning

confidence: 99%

“…Many practical methods are used to improve the uniformity of RF heating in agricultural products (Birla et al, 2004;Wang et al, 2006;Tiwari et al, 2008;Sosa-Morales et al, 2009;Gao et al, 2010). For example, forced hot air, product movement, and mixing have been successfully applied to improve heating uniformity in RF-treated dry products both in laboratory and industrial-scale systems (Wang et al, 2005(Wang et al, , 2007a(Wang et al, , 2008a(Wang et al, , 2008bJiao et al, 2011aJiao et al, , 2011bGao et al, 2011). These practical methods could be further evaluated to improve the RF heating uniformity when treating coffee beans.…”

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confidence: 99%

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Coffee Bean Heating Uniformity and Quality as Influenced by Radio Frequency Treatments for Postharvest Disinfestations

Pan¹,

Jiao²,

Gautz³

et al. 2012

Transactions of the ASABE

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Developing effective and economically viable treatments that replace chemical phytosanitary and quarantine practices is urgently needed for the coffee bean industry to maintain competitiveness in domestic and international markets. The objective of this study was to determine coffee bean heating uniformity and quality as influenced by radio frequency (RF) treatments for postharvest disinfestations. A pilot-scale, 27 MHz, 6 kW RF unit was used to study RF heating uniformity, develop a treatment protocol, and evaluate quality attributes in treated coffee beans. After comparing three selected electrode gaps, an appropriate gap of 14 cm was obtained to raise the central temperature of 2.75 kg samples to 48°C using RF energy by 4.6 min, compared to more than 237 min for samples to reach only 45°C when using forced hot air at 48°C. RF heating uniformity in bean samples was improved by adding forced hot air and back and forth movements on the conveyor at 0.89 m min -1 . The final temperatures reached 50.4°C in the interior of the sample and 50.6°C on the sample surface, resulting in small uniformity index values of 0.023 to 0.060 for the interior temperature and 0.073 for surface temperature distributions. RF treatments combined with forced hot air at 48°C to hold the target temperature for 10 min followed by forced room air cooling through a 3 cm product layer provided good bean quality. No significant differences in weight loss, moisture content, and color were observed between RF treatments and unheated controls.

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Section: Determination Of Electrode Gap and Heating Ratementioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Coffee Bean Heating Uniformity and Quality as Influenced by Radio Frequency Treatments for Postharvest Disinfestations

Pan¹,

Jiao²,

Gautz³

et al. 2012

Transactions of the ASABE

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“…This technology is not fundamentally new for pest control, and it was previously studied and reported since the 1930s [ 13 ]. It has been suggested as a substitute for chemical fumigation for pest management in postharvest agricultural production, including against insect pests of walnut in storage settings [ 3 , [14] , [15] , [16] , [17] ] as well as the cowpea weevil ( Callosobruchus maculatus ), Indian meal moth ( Plodia interpunctella ) [ 18 ], and rice weevil ( Sitophilus oryzae ) [ 19 , 20 ]. Furthermore, microwave and RF heating have been investigated as nonchemical alternatives for controlling field insect pests, including the red palm weevil Rhynchophorus ferrugineus [ 2 , 4 , [21] , [22] , [23] ] and the African bollworm Helicoverpa armigera [ [24] , [25] , [26] ].…”

Section: Introductionmentioning

confidence: 99%

Dielectric heating for controlling field and storage insect pests in host plants and food products with varying moisture content

El Arroud,

El Fakhouri,

Zaarour

et al. 2024

Heliyon

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“…Many studies have explored the possibility of using RF energy to disinfest produce with insect pests (Hallman and Sharp, 1994;Mitcham et al, 2004;Lagunas-Solar et al, 2007;Shrestha and Baik, 2013). RF energy has been used for disinfesting legumes, such as chickpeas (Johnson et al, 2010), green peas (Wang et al, 2010), black-eyed peas, and lentils (Wang et al, 2008b;Jiao et al, 2012). Treatment conditions of 55°C to 58°C for 5 to 10 min have been successfully applied to achieve 100% insect (cowpea weevil) mortality without major effects on legume (chickpea, green pea, and lentil samples) color, weight loss, and germination (Johnson et al, 2004;Jiao et al, 2012).…”

mentioning

confidence: 99%

Finite Element Modeling and Analysis of Radio Frequency Heating Rate in Mung Beans

2015

Trans. ASABE

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Radio frequency (RF) heating has been extensively studied as a novel disinfestation method for dry agricultural products. A major difficulty in using this method is that different heating rates at the corners and edges of materials may cause negative effects on product quality. A systematic analysis of factors that influence the RF heating rate is desirable to help in designing effective treatment protocols. A finite element model using COMSOL Multiphysics software was developed and experimentally validated with 3 kg of mung beans in a 6 kW, 27.12 MHz free-running oscillator RF system to study the influence of sample moisture content, density, specific heat capacity, thermal conductivity, dielectric properties, top electrode voltage, and electrode gap on RF heating rate. Simulation results demonstrated that the variation in sample density and specific heat capacity, especially thermal conductivity, had a relatively slight effect on RF heating rate. The RF heating rate was significantly influenced by electrode gap, top electrode voltage, and the dielectric properties and moisture content of the sample. These heating rate distributions might be valuable in guiding and optimizing RF treatment conditions, which are helpful to improve RF heating uniformity for disinfecting dry products.

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Treatment design of radio frequency heating based on insect control and product quality

Cited by 54 publications

References 19 publications

Coffee Bean Heating Uniformity and Quality as Influenced by Radio Frequency Treatments for Postharvest Disinfestations

Coffee Bean Heating Uniformity and Quality as Influenced by Radio Frequency Treatments for Postharvest Disinfestations

Dielectric heating for controlling field and storage insect pests in host plants and food products with varying moisture content

Finite Element Modeling and Analysis of Radio Frequency Heating Rate in Mung Beans

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