Study of Fabricated Solar Dryer of Tomato Slices under Jordan Climate Condition

Olimat, Abdullah N.

doi:10.14710/ijred.6.2.93-101

Cited by 8 publications

(9 citation statements)

References 10 publications

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“…Because the values of Me are too small to compared to Mt or M0 for a long period of time (Olimat 2017). , b, c, n, k,: empirical constants and coefficients in drying models…”

Section: Mathematical Modeling Of the Drying Curvesmentioning

confidence: 99%

Determination of Sliced Pineapple Drying Characteristics in A Closed Loop Heat Pump Assisted Drying System

Tunçkal

Coşkun

Doymaz

et al. 2018

Int. J. Renew. Energy Dev.

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Pineapple (Ananascomosus) slices were dried with the aid of a heat pump assisted dryer (HPD). During this process, air velocity was kept constant at 1m/s, while air temperatures were changed as 37°C, 40°C and 43°C. The drying air was also circulated by using an axial fan in a closed cycle and fresh air was not allowed into the system. The drying rate and drying time were significantly influenced by drying temperature. It was observed that drying temperatures had significant effects on the drying rate and drying time. During the conduct of the study, pineapple slices were dried at 37, 40 and 43°C for 465, 360 and 290 min, respectively. The specific moisture extraction ratio (SMER) values were observed to change as drying temperatures were changed. The drying rate curves indicated that the whole drying process occurred in the falling rate period. Seven well-known thin-layer models (Lewis, Henderson &Pabis, Logarithmic, Page, Midilli & Kucuk, Weibull and Aghbashlo et al.) were employed to make a prediction about drying kinetics through nonlinear regression analysis. The Midilli & Kucuk and Aghbashlo et al. models were consistent with the experimental data. Fick’s second law of diffusion was used to determine the moisture diffusivity coefficient ranging from 3.78×10–9 to 6.57×10-9 m2/s the each of the above mentioned temperatures. The dependence of effective diffusivity coefficient on temperature was defined by means a fan Arrhenius type equation. The activation energy of moisture diffusion was found to be 75.24kJ/mol. Article History: Received: July 18th 2017; Received: October 27th 2017; Accepted: January 16th 2018; Available onlineHow to Cite This Article: Tunçkal, C., Coşkun, S., Doymaz, I. and Ergun, E. (2018) Determination of Sliced Pineapple Drying Characteristics in A Closed Loop Heat Pump Assisted Drying System. International Journal of Renewable Energy Development, 7(1), 35-41.https://doi.org/10.14710/ijred.7.1.35-41

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“…Because the values of Me are too small to compared to Mt or M0 for a long period of time (Olimat 2017). , b, c, n, k,: empirical constants and coefficients in drying models…”

Section: Mathematical Modeling Of the Drying Curvesmentioning

confidence: 99%

Determination of Sliced Pineapple Drying Characteristics in A Closed Loop Heat Pump Assisted Drying System

Tunçkal

Coşkun

Doymaz

et al. 2018

Int. J. Renew. Energy Dev.

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“…Energy is necessary for different human activities such as heating (Arab et al 2012), transportation and some other purposes like desalination systems (Jahangiri et al 2014;Olimat 2017;Tarwidi et al 2016). Over the past century, fossil fuels have provided most of human energy demand; however, due to growing environmental concerns and predicted lack of fossil fuels in the near future, there are many attempts to find appropriate alternative resources for energy which is environmentally benign and renewable (Toghi et al 2015, Dellosa 2016.…”

Section: Introductionmentioning

confidence: 99%

Multi-Criteria Decision Making (MCDM) Approach for Selecting Solar Plants Site and Technology: A Review

Ghasempour

Nazari

Ebrahimi

et al. 2019

Int. J. Renew. Energy Dev.

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Renewable energies have many advantages and their importance is rising owing to gravely mounting concerns for environmental issues and lack of fossil fuels in the future. Solar energy, well acknowledged as an inexhaustible source of energy, is developing dramatically for different purposes such as desalination and electricity generation. Appropriate solar power plant is very important factor for power generation due to its cost and other constraints. The applied technology is as important as the solar power plants location. In this paper, a wide variety multi criteria decision making (MCDM) methods, investigated by various researchers, are presented to obtain effective criteria in selecting solar plants sites and solar plants technologies. There is not any comprehensive research providing all required criteria for decision making for site and technology selection. Based on the reviewed researches, weight of each criterion depends on many factors such as region, economy, accessibility, power network, maintenance costs, operating costs, etc. The important criteria for site selection are represented and investigated thoroughly in this review paper.© 2019. CBIORE-IJRED. All rights reservedArticle History: Received June 17th 2017; Received in revised form March 7th 2018; Accepted June 16th 2018; Available onlineHow to Cite This Article: Ghasempour, R., Nazari, M.A., Ebrahimi, M., Ahmadi, M.H. and Hadiyanto, H. (2019) Multi-Criteria Decision Making (MCDM ) Approach for Selecting Solar Plants Site and Technology: A Review. Int Journal of Renewable Energy Development, 8(1), 15-25.https://doi.org/10.14710/ijred.8.1.15-25

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“…The dehydration process has two stages where the first stage is the moisture content shifted up to product surfaces and evaporated by convection of heated air-stream. The moisture content (%) were removed from the product center and surfaces then evaporated to the environment or chamber where later will be exhausted by a static pressure fan through the chimney (Olimat, 2017). The vaporization of moisture content of the products during the drying process needs a supply of latent heat and adequate airflow to increase vapor pressure over the products to remove the vaporized water away from the drying chamber.…”

Section: Literature Reviewmentioning

confidence: 99%

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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Study of Fabricated Solar Dryer of Tomato Slices under Jordan Climate Condition

Cited by 8 publications

References 10 publications

Determination of Sliced Pineapple Drying Characteristics in A Closed Loop Heat Pump Assisted Drying System

Determination of Sliced Pineapple Drying Characteristics in A Closed Loop Heat Pump Assisted Drying System

Multi-Criteria Decision Making (MCDM) Approach for Selecting Solar Plants Site and Technology: A Review

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

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