Design and experimental evaluation of a mixed-mode continuous solar dryer for plaster molds

Aguilar-Castro, K.M.; Flores-Prieto, J. J.; Baltazar-Lopez, Martin E.; Macías-Melo, E.V.

doi:10.1007/s12206-012-0707-x

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…The active mode indirect solar dryer has a significant effect on the reduction of the drying time compared to the traditional drying method with a reduction of drying time at 42.85% [7]. The final food products were considered as clean and had better quality compared to the open sun drying method [1]. The drying time was found to be shorter when drying a variety of range of food products at different air flow rates during drying.…”

Section: The Advantages Of the Indirect Solar Dryer (Active Mode)mentioning

confidence: 99%

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Semi empirical modelling for thin sliced potato drying under active-mode indirect solar dryer

D Pagukuman,

Wan Ibrahim,

Mat Roni

2024

E3S Web Conf.

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This paper aims to select the best semi-empirical model for thinly sliced potato drying under active mode indirect solar dryer with variations of the exhaust air velocities. The exhaust air velocities to remove the vaporized moisture inside the drying chamber were set at 0.2m/s, 0.4m/s, 0.6m/s, and 0.8m/s. The solar intensity, temperature and relative humidity were measured. The Sigmaplot software was used to select the best thin layer drying model for sliced potatoes drying under indirect solar dryer assisted with a solar accumulator and exhaust fan. From the result, drying at 0.2m/s shows a significant drying performance with reduced mass percentages at 69%. The lowest the exhaust air velocity, the better reduction of the mass percentages and the higher the evaporation rate. Consequently, a Rational four (4) parameter was selected as the best of all the drying models, according to r2, RSME, and x2. This study gives a useful understanding of the significant effect of the variations of the exhaust air velocities on the drying performance.

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Section: The Advantages Of the Indirect Solar Dryer (Active Mode)mentioning

confidence: 99%

“…The active mode of the indirect solar dryer was proven to increase the quality of the final dried products quality. It has a faster drying rate than the passive mode [1]. Active circulation of the warm air inside the drying chamber can help to improve heat transmission through the product inside the drying chamber [2].…”

Section: Introductionmentioning

confidence: 99%

Semi empirical modelling for thin sliced potato drying under active-mode indirect solar dryer

D Pagukuman,

Wan Ibrahim,

Mat Roni

2024

E3S Web Conf.

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“…The solar drying method is one of the most effective methods to preserve excessive production of agriculture produces. Among two categories of solar dryers, the active type of indirect type can improve the quality of food products by providing a higher drying rate compared to the direct type or passive dryer (Aguilar-Castro et al , 2012).…”

Section: Literature Reviewmentioning

confidence: 99%

“…As for the hybrid indirect solar dryer the direct energy supply (thermal energy) is available during sunny days and the indirect supply will be needed after sun-off and cloudy or during raining season. This hybrid indirect solar dryer is categorized as a direct and indirect solar heating method where the direct energy supply when available and indirect supply when complementary (Aguilar-Castro et al , 2012).…”

Section: Forced Convection Solar Dryer (Active Dryer)mentioning

confidence: 99%

“…Solar energy is one of the most promising alternate energy sources, as it is comprehensive and has contributed significantly to the sustainability of energy worldwide. The continuous process and supply of solar thermal applications make it required by industrial processes (Aguilar-Castro et al , 2012). Hot air drying is one of the most common and widely used drying methods used by most farmers in undeveloped and developing countries during the post-harvest season to dry surplus harvested crops.…”

Section: Introductionmentioning

confidence: 99%

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A review of the significance effect of external factors of the solar dyer design to dried foods product quality

Pagukuman

Ibrahim

2021

JEDT

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Purpose The purpose of this paper is to present and discuss the external factors of the solar dryer design that influenced the thermal efficiency of the solar dryer that contribute to the better quality of dried food products. Design/methodology/approach From the reviewed works of literature, the external factors including the drying temperature, airflow rate and relative humidity have significant effects to increase the rate of moisture diffusivity of the freshly harvested products during the drying process. The proper controls of airflow rate (Q), velocity (V), relative humidity (RH%) and drying temperature (°C) can influence the dried product quality. The dehydration ratio is the procedure to measure the quality of the dried food product. Findings The indirect solar dryer including the mixed-mode, hybrid and integrated was found shorter in drying time and energy-intensive compared to sun drying and direct drying. The recommended drying temperature is from 35.5°C to 70°C with 1–2 m/s velocity and 20%–60% relative humidity. The optimum thermal efficiency can be reached by additional devices, including solar collectors and solar accumulators. It gives a simultaneous effect and elongated the drying temperature 8%–10% higher than ambient temperature with 34%–40% energy saving. The recommended airflow rate for drying is 0.1204 to 0.0894 kg/s. Meanwhile, an airflow rate at 0.035–0.04 kg/m2 is recommended for an optimum drying kinetic performance. Research limitations/implications This paper discusses the influence of the external factors of the solar dryer design on the thermal performance of the solar dryer and final dried food products quality. Therefore, the findings cannot serve as a statistical generalization but should instead be viewed as the quantitative validation subjected to fundamentals of the solar dryer design process and qualitative observation of the dried food product quality. Practical implications A well-designed of solar dryer with low operating and initial fabrication cost, which is simple to operate is useful for the farmers to preserve surplus harvested crops to an acceptable and marketable foods product. The optimization of the external and internal factors can contribute to solar dryer thermal performance that later provides an organoleptic drying condition that results in good quality of dried product and better drying process. The recommended drying temperature for a drying method is between 35°C up to 70°C. Drying at 65.56°C was effective to kill microorganisms. Meanwhile, drying at 50°C consider as average drying temperature. The recommended airflow rate for drying is 0.1204 to 0.0894 kg/s. Meanwhile, air flowrate at 0.035–0.04 kg/m2 is recommended for optimum drying kinetic performance. The recommended value of aspect ratio and mass flow rate is 200 to 300 for an optimum evaporation rate. The good quality of dried products and good performance of solar dryers can be developed by proper control of airflow rate (Q), velocity (V), relative humidity (RH%) and drying temperature (°C). Social implications The proper control of the drying temperature, relative humidity and airflow rate during the drying process will influence the final dried food products in terms of shape, color, aroma, texture, rupture and nutritious value. It is crucial to control the drying parameters because over-drying caused an increment of energy cost and reduces the dry matter. The quick-drying will disturb the chemical process during fermentation to be completed. Originality/value This study identifies the potential of the solar drying method for dehydrating agricultural produces for later use with the organoleptic drying process. The organoleptic drying process can reduce mold growth by promising an effective diffusion of moisture from freshly harvested products. The research paper gives useful understandings that well-designed solar drying technology gives a significant effect on dried product quality.

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Near infrared reflectance spectroscopy: Moisture content measurement for ceramic plaster

2014

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Design and experimental evaluation of a mixed-mode continuous solar dryer for plaster molds

Cited by 9 publications

References 16 publications

Semi empirical modelling for thin sliced potato drying under active-mode indirect solar dryer

Semi empirical modelling for thin sliced potato drying under active-mode indirect solar dryer

A review of the significance effect of external factors of the solar dyer design to dried foods product quality

Near infrared reflectance spectroscopy: Moisture content measurement for ceramic plaster

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