Experimental performance of a new design of solar dryer for drying osmotically dehydrated cherry tomatoes

Nabnean, S.; Janjai, Serm; Thepa, Sirichai; Sudaprasert, Kaokanya; Songprakorp, Roongrojana; Bala, B. K.

doi:10.1016/j.renene.2016.03.013

Cited by 104 publications

(25 citation statements)

References 28 publications

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“…pre-treatments have been devised for specific herbs such as thyme (Lahnine et al, 2016). For colour retention in dried cherry tomatoes, osmotic dehydration in a hypertonic solution has been employed for partial water removal before subsequent drying in a solar dryer (Nabneun et al, 2016) to produce high quality dried tomatoes with desired colour in a Table 1 Estimates of post-harvest losses for various commodities in India (Alam et al, 1980;Anon, 2004 considerably reduced drying time. The latent heat of vapourisation depends on the crop, its preparation, moisture content, and temperature (Ekechukwu and Norton, 1999a;Ekechukwu, 1999).…”

Section: Psychometry Of Air In a Solar Dryermentioning

confidence: 99%

Solar dryers for tropical food preservation: Thermophysics of crops, systems and components

Tomar

Tiwari

Norton³

2017

Solar Energy

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Drying reduces the moisture content of harvested crops thus slowing decay processes to enable longerterm storage. Solar dryers contain the crop being dried, to enhance solar energy collection incurring lower crop losses than are associated with open-sun drying and recurrent costs than are inherent to uses of fossil-fuels for drying. The influences of key environmental, operational and design parameters for solar dryers are discussed including: (i) psychrometry of drying processes and ambient conditions, (ii) how initial crop properties are converted to final desired product attributes, (iii) feasibility of using powered components such as fans and (iv) air-heating solar collector selection.

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Section: Psychometry Of Air In a Solar Dryermentioning

confidence: 99%

Solar dryers for tropical food preservation: Thermophysics of crops, systems and components

Tomar

Tiwari

Norton³

2017

Solar Energy

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“…Additionally, osmotic process is not enough sufficient to reach low moisture content of product to be considered a shelf stable so product needs to be dried after the OD process (Ramya & Jain, ). There are many researches that OD is used as a pretreatment of drying of chili flesh (Zhao et al, ), mirabelle plum (Dehghannya, Gorbani, & Ghanbarzadeh, ), cherry tomatoes (Nabnean et al, ), and persimmons (Demiray & Tulek, ; Sampaio, Neto, Perez, Boizan, & da Silva, ).…”

Section: Introductionmentioning

confidence: 99%

Comparison between Artificial Neural Network model and mathematical models for drying kinetics of osmotically dehydrated and fresh figs under open sun drying

Şahin

Öztürk

2018

J Food Process Engineering

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In this study, drying kinetics of figs (Ficus carica L) under open sun drying (OSD) was compared with using Artificial Neural Network (ANN) model and mathematical models. Pulsed vacuum osmotic dehydration (PVOD) was applied as a pretreatment. In experiments, whole figs (Sarılop variety) were immersed in sucrose solution at 50°Brix and 50 °C with a ratio of solution/food was 4:1 for 180 min. Vacuum impregnation was applied at 253 mbar for 15 min. Shrinkage effect was considered, also. Results showed that PVOD reduced drying time of figs. The mean of Deff values of PVOD treated and fresh figs were obtained as 2.55 × 10−10 m2/s and 2.36 × 10−10 m2/s, respectively. It was found that present model was the best drying model with the highest correlation coefficient (R2) values among the mathematical models whereas ANN model had a higher correlation coefficient (R2 = 0.9999) values than the mathematical models for both PVOD treated and fresh figs. Practical applications Dried figs have an economic income for Turkey and Turkey is the biggest dried fig producer and exporter in the World. Drying of figs is very important phenomena because figs have a short harvesting time. Figs are widely dried under open sun because this method has low operating cost. OD method is used before drying step and provides reducing drying time. This study presents experimental results of osmotically dehydrated and fresh figs under open sun drying. Drying kinetics of figs were modeled with empirical and semiempirical models under shrinkage consideration. Shrinkage of fresh and osmotically dehydrated figs during the drying were mathematically modeled thus these correlations can be helpful for researchers. Also, a new mathematical model was established and this model had more accuracy than other mathematical models. The ANN model was used for the prediction of drying curves of figs in different operating conditions.

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“…The efficiency and the payback period of the solar collector were found to be 21%–69% and 1.37 years, respectively. 14 A thermal analysis of the solar tunnel greenhouse peppermint dryer was investigated based on thermal balance equations in order to predict its performance. The performance of solar greenhouse dryer was evaluated in terms of system temperatures, drying rate, drying efficiency, product quality, and drying cost.…”

Section: Introductionmentioning

confidence: 99%

Performance and CO₂ mitigation analysis of a solar greenhouse dryer for coconut drying

Ayyappan¹

2018

Energy & Environment

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A natural convection solar greenhouse dryer with biomass back-up heater was developed and tested for its performance during summer and winter months under the meteorological conditions of Pollachi, India, using coconuts as drying material. The dryer maintained the temperature between 33°C and 60°C during summer, 26°C and 43°C during winter periods. The biomass heater maintained the temperature inside the dryer between 35°C and 45°C during night. The coconuts were dried from an initial moisture content of 53% to a final moisture content of around 7% in 54 h in summer and 74 h in winter in the solar-biomass hybrid dryer compared to 153 h during summer and 247 h during winter in open sun drying. The thermal efficiency of the solar-biomass hybrid dryer was found to be 24% and 21%, respectively, during summer and winter time. The embodied energy of the dryer is found to be 18,302 kWh and the CO2 emission was 1518 kg per year. The net CO2 mitigation is 678 tonnes and the total carbon credit earned is $18,645. The payback period of the drier was found to be 3.3 years.

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Experimental performance of a new design of solar dryer for drying osmotically dehydrated cherry tomatoes

Cited by 104 publications

References 28 publications

Solar dryers for tropical food preservation: Thermophysics of crops, systems and components

Solar dryers for tropical food preservation: Thermophysics of crops, systems and components

Comparison between Artificial Neural Network model and mathematical models for drying kinetics of osmotically dehydrated and fresh figs under open sun drying

Performance and CO₂ mitigation analysis of a solar greenhouse dryer for coconut drying

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Experimental performance of a new design of solar dryer for drying osmotically dehydrated cherry tomatoes

Cited by 104 publications

References 28 publications

Solar dryers for tropical food preservation: Thermophysics of crops, systems and components

Solar dryers for tropical food preservation: Thermophysics of crops, systems and components

Comparison between Artificial Neural Network model and mathematical models for drying kinetics of osmotically dehydrated and fresh figs under open sun drying

Performance and CO2 mitigation analysis of a solar greenhouse dryer for coconut drying

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Product

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Performance and CO₂ mitigation analysis of a solar greenhouse dryer for coconut drying