Experimental investigation and economic evaluation of a new mixed-mode solar greenhouse dryer for drying of red pepper and grape

Elkhadraoui, Aymen; Kooli, Sami; Hamdi, Ilhem; Farhat, Abdelhamid

doi:10.1016/j.renene.2014.11.090

Cited by 190 publications

(57 citation statements)

References 24 publications

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“…[4][5][6] The GHSD is more advantageous compared to other technologies; it has a simple construction with low operational costs; it has a high convective heat transfer (CHT) coefficient; it gives a very high quality of the dried product and reduces the drying time; 7,8 it can be used in mixed-mode with natural or forced convection; and under forced convection can reduce moisture content in lower time as well as increase drying rate compared with natural convection mode. 9,10 The main disadvantages of GHSD are that drying efficiency depends on climatic conditions and seasons; the need to use additional heat sources; the fact that facilities occupy a large area; and the possibility of odor emission released during drying of some products. 7 However, the design of the GHD must be based on sound scientific principles that facilitate good quality control of products during the drying process.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis of heat transfer in a greenhouse solar dryer “chapel‐type” coupled to an air solar heating system

Román-Roldán

López‐Ortiz

Ituna-Yudonago

et al. 2019

Energy Science & Engineering

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The distribution of turbulent kinetic energy (TKE), temperature, and velocity of humid air inside the greenhouse solar dryer (GHSD) was numerically investigated using 3D CFD ANSYS FLUENT code. The effect of solar radiation was coupled with the energy equations using the discrete ordinate model. Numerical simulations were based on two geometric models: Real model and model with reduced height, the solution was in good agreement with experimental data of temperature. The results of the real model showed that the TKE is ranged between 1.27 m2/s2 and 6 m2/s2 with an average of about 1.6 m2/s2 for the entire greenhouse dryer (GHD) volume. The greatest TKE magnitude is in the paths of the diffusers, which caused a temperature drop of about 2 K in the areas near the walls. Consequently, almost homogeneous temperature distribution was obtained in the entire volume of the GHD, although the average temperature was 315 K, and a gradient with respect to ambient temperature was of 14 K, that is, suitable for drying. Also, the average air velocity at 1 m height was 0.71 m/s, which is a value near the lowest limit (0.6 m/s) of forced convection drying. The improvement in the GHD by 36.5% volume reduction allowed an increase in the average TKE of 3.8 m2/s2 (2.4 times more than the previous one) located in the middle of the greenhouse; the average temperature reached 316.5 K with a gradient of 15.5 K, which represents an increase of 1.5 K (11%) compared to the real geometric model. The air velocity at 1 m height increased to 0.9 m/s in the improved geometric model (a growth of 35.7% compared with the previous geometry). More than 95% of the improved GHD volume has a uniform temperature, which is very suitable for a good quality drying process with higher speed.

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Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis of heat transfer in a greenhouse solar dryer “chapel‐type” coupled to an air solar heating system

Román-Roldán

López‐Ortiz

Ituna-Yudonago

et al. 2019

Energy Science & Engineering

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“…The HTF inlet and outlet has a temperature of 88.7 and 92.8°C, respectively at 11.30h, decreases until 74.72 and 75.85°C, respectively at 12.05h and then increases again till reaching 89. 1 Fig. 7.…”

Section: A Test Methodologymentioning

confidence: 99%

“…Tunisia enjoys an important solar energy potential, Tunisia has between 2860 and 3200 h of sunshine per year with a daily insolation range from 5 h in December to 13 h in July. It receives a daily average solar energy of 4.8 kW h/m2 /day [1].…”

Section: Introductionmentioning

confidence: 99%

Design, manufacturing and performance evaluation of a new parabolic trough collector

Chafie

Aissa

Farhat

et al. 2016

2016 7th International Renewable Energy Congress (IREC)

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In this work, a parabolic trough collector system with aperture area of 10.66 m 2 was designed, manufactured and evaluated. The experimental study was conducted and realized in the Research and Technology Center of Energy (CRTEn) in Tunisia. In order to evaluate the thermal performance of the PTC, many experimental tests were carried out in keeping with the ASHRAE 93-1986 standard. The intercept and the slope given by the collector's efficiency curve were found to be 0.5586 and 0.3199, respectively. In this context, an experimental performance investigation of typical days (sunny and cloudy days) is presented. The results show that the average thermal efficiency for sunny and cloudy days is found to be 41.63% and 29.3%, respectively and the average useful heat gain are 255.91 W/m 2 and 173.78 W/m 2 for the sunny and cloudy days, respectively.

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“…Fresh air comes in contact with crop through the exposed bottom of the PVT dryer; and moisture has been taken away with the help of hot air through DC fan. Various researchers theoretically and experimentally studied the active greenhouse dryers (Tiris et al, 1995;Sarsilmaz et al, 2000;Bala et al, 2003;Al-Juamily et al, 2007;Zomorodian et al, 2007;Sreekumar et al, 2008;Janjai et al, 2011;Singh and Kumar, 2013;Elkhadraoui et al, 2015;Kumar et al, 2016).…”

Section: Photovoltaic Thermal (Pvt) Greenhouse Dryermentioning

confidence: 99%

“…They optimized the three number of fans for rated capacity of the solar dryer. Elkhadraoui et al (2015) investigated the performance of FPC integrated mixed dryer under natural circulation mode; and found that the dried the red pepper and sultana grapes within 7 and 17 h respectively.…”

Section: Photovoltaic Thermal (Pvt) Greenhouse Dryermentioning

confidence: 99%

Review on series connected photovoltaic thermal (PVT) systems: Analytical and experimental studies

Sahota

Tiwari

2017

Solar Energy

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Experimental investigation and economic evaluation of a new mixed-mode solar greenhouse dryer for drying of red pepper and grape

Cited by 190 publications

References 24 publications

Computational fluid dynamics analysis of heat transfer in a greenhouse solar dryer “chapel‐type” coupled to an air solar heating system

Computational fluid dynamics analysis of heat transfer in a greenhouse solar dryer “chapel‐type” coupled to an air solar heating system

Design, manufacturing and performance evaluation of a new parabolic trough collector

Review on series connected photovoltaic thermal (PVT) systems: Analytical and experimental studies

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