Review on Latent Heat Solar Air Collectors

Selvaraj, M.; Girimurugan, R.; Vairavel, M.

doi:10.34218/ijaret.10.6.2019.014

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…Systems the solar drying system is a cheap/cost-effective and good alternative to cultural and during crop harvest season in sunny areas [22]. The vegetables and fruits can be dried like tomato, onion, pepper, garlic and spinach [23][24][25], banana [26] and dates [27,28] by using solar drying system to maintain the international standards of both vegetables [29]. Solar dryers are alternative to dry date fruits on mats in open area.…”

Section: Introductionmentioning

confidence: 99%

The Designing and Optimization of Solar Dryers for Improving the Quality of Dates in Khairpur, Pakistan

Bhatti¹,

Ilyas²,

Korai³

et al. 2022

Pol. J. Environ. Stud.

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The present work was conducted to develop an efficient solar dryer for improving date fruit quality of Khairpur, Pakistan. Three different dryers were developed i.e., a natural convectional solar dryer, direct solar dryer and an oven solar dryer comprising air velocity of 0.5 m/s, 0.6 m/s and 0.4 m/s respectively. The temperature inside the three dryers significantly increased with the increase in time interval from 2 to 10 hrs. An average temperature ranged from 40.4 to 41.4ºC after 2 hrs which was significantly higher (p<0.0001) than the air temperature outside (36.4ºC) the three dryers. Moreover, increased up to 47.9ºC after 10 hrs of interval. Average highest temperature recorded in oven dryer was 41.4, 41.9, 45.8, 41.8 and 47.9 after a time interval of 2, 4, 6, 8 and 10hrs respectively. The highest solar radiation was observed as 985 W/m 2 at 2:30 pm and average solar radiation was found to be 791 W/m 2 . The highest percentage of total sugar (67.7%), non-reducing sugars (18.1%) and reducing sugars (49.54%), proteins (31%) and calcium quantity (32.59 µg/g) was found in conventional dryers, which was followed by (66.88%) of total sugars,( 49.6%) of reducing sugars and (17.61%) non-reducing sugars in direct dryer and (2.19%) of proteins and (22.76) µg/g of calcium in oven dryer. The results revealed that the drying natural oven solar dryer provided a good quality dates with satisfactory and competitive to enforce convective solar drying process. The drying time found to be approximately 8 hours daily and total 5 days taken to complete process of drying dates presents the advantage of being able to avoid the discontinuity of the treatment and to discard the night conservation problems. Owing to its low cost and green energy use, this study offers an efficient alternative to convectional drying under open sunlight for making quality dates.

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Section: Introductionmentioning

confidence: 99%

The Designing and Optimization of Solar Dryers for Improving the Quality of Dates in Khairpur, Pakistan

Bhatti¹,

Ilyas²,

Korai³

et al. 2022

Pol. J. Environ. Stud.

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Heat transfer augmentation in a solar air heater with conical roughness elements on the absorber

Alsaiari

Alzahrani

Madhukeshwara

et al. 2022

Case Studies in Thermal Engineering

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Thermal–hydraulic analysis of a solar air heater fitted with a wire-roughened absorber plate

Madhukeshwara

Alhadhrami

Alzahrani

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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This study is to evaluate heat transmission and friction in a rectangular solar air heater with a V-shaped wire rib roughness on the absorber plate that operates in fully formed turbulent flow. Additionally, studies are performed to generate prediction equations for the average friction factor, Stanton number, and efficiency index. The Reynolds number [Formula: see text]–[Formula: see text], angle of attack [Formula: see text]20[Formula: see text]–90[Formula: see text]), relative roughness pitch [Formula: see text]–[Formula: see text], relative roughness height [Formula: see text]–[Formula: see text], and the aspect ratio [Formula: see text]–[Formula: see text] was varied. The efficiency index [Formula: see text] is commonly employed as a thermo-hydraulic performance metric. It is computed as [Formula: see text]. The wire roughness and airflow parameters [Formula: see text] are optimized to maximize heat transfer while retaining minimal friction losses. On the basis of resemblance criteria, average Stanton numbers, average Nusselt numbers, and even average friction factors are derived. The results are compared to those obtained with a smooth absorber duct under similar airflow circumstances in order to assess the increase in heat transfer coefficient and friction factor. The [Formula: see text], and [Formula: see text] have a significant influence on thermo–hydraulic performance, according to these studies. With [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text], the optimal configuration geometry for wire roughness and solar air heater duct is identified.

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Review on Latent Heat Solar Air Collectors

Cited by 4 publications

References 30 publications

The Designing and Optimization of Solar Dryers for Improving the Quality of Dates in Khairpur, Pakistan

The Designing and Optimization of Solar Dryers for Improving the Quality of Dates in Khairpur, Pakistan

Heat transfer augmentation in a solar air heater with conical roughness elements on the absorber

Thermal–hydraulic analysis of a solar air heater fitted with a wire-roughened absorber plate

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