Usage of hybrid solar collector system in drying technologies of medical plants

Čiplienė, Aušra; Novošinskas, Henrikas; Raila, Algirdas; Zvicevičius, Egidijus

doi:10.1016/j.enconman.2015.01.051

Cited by 34 publications

(7 citation statements)

References 25 publications

(32 reference statements)

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“…A 10 g portion of each sample is aseptically cut and then thoroughly milled using the stomacher mill, decimal dilutions are carried out using a 1/4 diluted Ringer solution previously sterilized. The microbiological analysis included the assessment of total contamination by enumeration of total aerobic mesophilic and detection of spoilage bacteria including E. coli, Staphylococcus aureus, Salmonella Typhi and Clostridium perfringens [20,21].…”

Section: Microbiological Analysismentioning

confidence: 99%

Experimental Measurement of Isothermal Sorption, Microbiological and Physicochemical Analysis of Dried Tomatoes Cultivated in Adrar, Algeria

Loumani¹,

Larbi²,

Mediani³

et al. 2020

IJDNE

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The fresh tomato is a very perishable product in arid regions for that the drying is an indsipendable technique to preserve this product and used at all times, in this study the fresh tomatoe was sampled from different farms in Adrar and subjected to the drying method using an indirect dryer solar. The dried tomatoes were screened for microbiological and physicochemical analysis including E. coli, Staphylococcus aureus, Salmonella Typhi, anaerobic sulfito- redactors, molds and yeasts in addition, the value of pH, water activity, dry matter, and assay of ash. The obtained results showed the presence of mesophilic aerobic total bacteria, and coliform total, the absence of Salmonella Typhi, Staphylococcus aureus, Clostridium perfringens and spores of anaerobic sulfito reducting and some colonies of yeasts, for the pH value, activity water, dray matter and assay of ash, the results were (4.10), (0.41), (9.63%) and (5.71%) respectively, which do not affect the final quality of the dried products and satisfactory to norms imposed by the commercial legislation of Algerian. On the other hand, the isothermal sorption is indispensable step to mastering the process of drying tomatoes, and to know the distribution and the intensity of the water connections in the products as a result, this experimental study aims to determine the physicochemical components' and the desorption isotherms curves for tomato harvested from the Touat region, in South-West Algeria, using the saturated salt solution method. The experiment is carried out for three temperature values 40℃, 50℃ and 60℃, to study the influence of the temperature on the equilibrium curves of the product and finally to describe the isothermal moisture desorption for tomato product for three temperatures using known models of GAB, GAB, modified BET who showing the best models isotherms sorption to model at and predict hygroscopic behavior during drying and storage. The results of this research can be used to determine characteristic drying curves and to have optimal storage conditions.

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Section: Microbiological Analysismentioning

confidence: 99%

Experimental Measurement of Isothermal Sorption, Microbiological and Physicochemical Analysis of Dried Tomatoes Cultivated in Adrar, Algeria

Loumani¹,

Larbi²,

Mediani³

et al. 2020

IJDNE

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“…The prepared raw material of purple coneflower was dried by active ventilation; temperature of heated ambient air was 44.8 ± 1.5°C and relative humidity -65.2 ± 3.8%. On the basis of recommendations (Raila et al, 2009;Čiplienė et al, 2015), an average comparative ventilation intensity equal to 4100 ± 550 m 3 (t h) -1 was maintained during the experiment. The drying experiment was conducted on a special test-bench with three drying containers, i.e.…”

Section: Methodsmentioning

confidence: 99%

The quantity of biologically active substances in purple coneflower as influenced by the preparation methods and drying technologies

Čiplienė

Maruška

Raila

et al. 2015

Zemdirbyste-Agriculture

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The purple coneflower (Echinacea purpurea (L.) Moench) is one of the most promising medicinal plants in Lithuania. More than 200 biologically active substances, and the most important components among themphenolic acids, including chicoric acid are accumulated in the medicinal plant raw material. Moisture content of purple coneflower raw material can reach up to 80% just after harvest, thus different drying technologies are used to reduce moisture content and this process involves losses of bio-active substances. An experimental comparative research was carried out to determine the influence of preparation and drying methods of purple coneflower for drying process and quality. It was found that weight of purple coneflower stems accounted for 48.7% of the total plant weight and they formed the largest above-ground part of a plant, which was by 1.5 and 2.6 times higher than the weight of leaves and flowers, respectively. In flowers, leaves and stems of purple coneflower, phenolic acids constituted the biggest part of phenolic compounds. The distribution of phenolic acids in different above-ground plant parts was from 64.66 ± 3.23 to 92.08 ± 4.60 mg g d.m.-1 RE (rutin equivalent) in flowers, from 47.46 ± 2.37 to 76.9 ± 3.85 mg g d.m.-1 RE in leaves and from 15.2 ± 1.05 to 22.99 ± 1.15 mg g d.m.-1 RE in stems.

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“…The main disadvantage in greenhouse dryer is that crops cannot be dried in off-sunshine hour (Prakash et al, 2016). To minimize this issue, the greenhouse dryer can be integrated with heat storage systems (Čiplienė et al, 2015;Kant et al, 2016). In order to improve the efficiency of greenhouse dryer, it can be coupled with solar air heater to make as hybrid system.…”

Section: Introductionmentioning

confidence: 99%

Drying Kinetics and Economic Analysis of Bitter Gourd Flakes Drying Inside Hybrid Greenhouse Dryer

Ahmada¹,

Prakash²,

Kumar

2021

Preprint

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In this study, heat storage-based hybrid greenhouse dryer has been developed and analysed for drying bitter gourd flakes under the climatic condition of Ranchi, India. The propose heat storage based hybrid greenhouse dryer consists of a solar air heater with 2.12 m2 area, greenhouse dryer and DC fan to induce and force the air. The significant objective of the present study is to analyse the drying efficiency, drying kinetics, property analysis, economic analysis, embodied energy and CO2 mitigation of the hybrid greenhouse dryer for drying of bitter gourd flakes. An experiment was performed simultaneously on proposed system and open sun drying for the proper comparative analysis. The results show that the mass of crop reduced from 4000g to 458g in 6 hr in proposed dryer and 4000g to 500g in 15 hr for open system. Thus, significant drying time is reduced in proposed system by 8 hours as compared to open system. Environmental impact analysis shows that the EPBT was found to be 0.4907 years only. The cost analysis of the proposed system dryer was 22664.30 INR. The total embodied energy is found to be 1591.07 kWh and earned carbon credit ranges from 16844.76 INR to 67379.05 INR, while CO2 mitigation was 46.28 tonnes for 35 years of expected lifetime. Seven standard mathematical models for drying of bitter gourd flakes were studied. Ahmad and Prakash model was found to be best as compared to other models. The metal contents of dried bitter gourd flakes were also examined. Bitter gourd dried in proposed dryers possesses superior metal content as compared to open system. Impact analysis demonstrates that the hybrid greenhouse dryer is more suitable for reducing post-harvest loss with environmental sustainability.

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Usage of hybrid solar collector system in drying technologies of medical plants

Cited by 34 publications

References 25 publications

Experimental Measurement of Isothermal Sorption, Microbiological and Physicochemical Analysis of Dried Tomatoes Cultivated in Adrar, Algeria

Experimental Measurement of Isothermal Sorption, Microbiological and Physicochemical Analysis of Dried Tomatoes Cultivated in Adrar, Algeria

The quantity of biologically active substances in purple coneflower as influenced by the preparation methods and drying technologies

Drying Kinetics and Economic Analysis of Bitter Gourd Flakes Drying Inside Hybrid Greenhouse Dryer

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