Bioactive compounds conservation and energy-mass analysis in the solar greenhouse drying of blackberry pulps

López‐Ortiz, Anabel; Norman, Azucena Silva; Garcı́a-Valladares, O.

doi:10.1007/s00231-021-03039-4

Cited by 2 publications

(2 citation statements)

References 45 publications

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“…A low-cost active greenhouse dryer (GHD;L opez-Ortiz et al, 2021) was used for the experiments. The covering material of the GHD was polyethylene (2 mm of thickness) with a transmittance of 0.59 ± 0.3% in region UV, 5.18 ± 3.33% in the visible region, the maximum value in IR was 65% with an average of 50 ± 15% (L opez-Ortiz et al, 2021).…”

Section: Drying Equipmentmentioning

confidence: 99%

“…It results in situations when excessive uncontrolled solar irradiance could impact product quality (Diamante & Munro, 1993; Sonmete et al, 2017). Covering the greenhouse with a nontransparent material can partially mitigate this problem (López‐Ortiz et al, 2021). Another way to control incident solar energy is active airflow control, available in active solar dryers.…”

Section: Introductionmentioning

confidence: 99%

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Energy analysis of drying basil (Ocimum basilicum) leaves in an active greenhouse solar dryer

López‐Ortiz

Ituna‐Yudonago

Gallardo‐Brígido

et al. 2023

J Food Process Engineering

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The need for better utilization of solar greenhouses during summer in the hot climate conditions of Mexico led to the development of the concept of active greenhouse solar dryers. The objective of this research was energy analysis of an active greenhouse solar dryer for basil leaves drying. The effect of variable solar irradiation on drying was accounted for by monitoring instantaneous effective diffusivity. Our experiments showed that the effective diffusivity of basil leaves increased with solar irradiation 100 times from 0.08 Â 10 À10 m 2 /s in the morning to 8.11 Â 10 À10 m 2 /s at the solar noon. The air temperature in the solar dryer was ranging from 42 to 48 C at the solar noon with solar irradiance of 806 W/m 2 . The energy required for moisture evaporation of basil leaves depended on the air temperature, reaching 337.6 kJ/mol just before solar noon. The amount of energy available in the solar dryer at noon was 124.14 MJ, much exceeding the energy required for basil leaves drying (16.94 MJ). The results of our study showed the feasibility of basil solar drying. The predictive model of basil drying in an active greenhouse solar dryer was developed. Practical ApplicationsThe feasibility of adaptation of an active greenhouse solar dryer to variable solar irradiance to ensure energy-saving drying is a contribution in the field DSG's. For this purpose, we propose to evaluate the energy transferred to the solar greenhouse, the instantaneous effective diffusivity of basil leaves accounting for air thermophysical properties Cp(T a ,x), k(T a ,x), as well as material thermophysical [Cp(T i ,x), k(T i ,x)] and mass transport properties Deff, (t) as time-dependent values. These, leads to monitoring the drying process under uncertain weather conditions, which allows to minimize risks of product quality loss and introduce advanced energy-saving control of active greenhouse dryers. Furthermore, the greenhouse driers can be uses as a cheap technology, with low energetic cost.

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Section: Drying Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy analysis of drying basil (Ocimum basilicum) leaves in an active greenhouse solar dryer

López‐Ortiz

Ituna‐Yudonago

Gallardo‐Brígido

et al. 2023

J Food Process Engineering

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Optical and thermal properties of edible coatings for application in solar drying

López‐Ortiz

Pineda

Méndez-Lagunas

et al. 2021

Sci Rep

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Solar drying is a sustainable process that may impact the quality of dried food. This is because, pigments contained in food are sensitive to sunlight, and exposure to ultraviolet radiation can affect them. We applied biopolymer-based coatings on strawberry, from hydro-colloidal solutions of Opuntia ficus indica-mucilage, fenugreek, xanthan gum, gum Arabic, and guar gum to evaluate their potential use as UV filters for solar drying of food. Thermal properties and the optical transmittance, absorbance and reflectance of the coatings were measured to assess their influence on food-sunlight interaction. During the drying experiments, the moisture content, total anthocyanins (TA), and total phenolic compounds (TPC) were measured. Optical and thermal properties are influenced by the biopolymer-based coatings. Also, the optical properties are influenced by the coating thickness. The differences in optical and thermal properties influence the drying process. Differences exist in the drying rate for strawberry slices with coating, compared with those without the coatings. In general, the TA and TPC content in the product are better preserved under solar drying than in control experiments done in a drying oven. A partial transmittance of solar UV radiation is recommended to obtain increased TA and TPC contents in the dried product.

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Bioactive compounds conservation and energy-mass analysis in the solar greenhouse drying of blackberry pulps

Cited by 2 publications

References 45 publications

Energy analysis of drying basil (Ocimum basilicum) leaves in an active greenhouse solar dryer

Energy analysis of drying basil (Ocimum basilicum) leaves in an active greenhouse solar dryer

Optical and thermal properties of edible coatings for application in solar drying

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