Comparative performance of coriander dryer coupled to solar air heater and solar air-heater-cum-rockbed storage

Chauhan, P. M.; Choudhury, C.; Garg, H.P.

doi:10.1016/1359-4311(95)00038-0

Cited by 54 publications

(13 citation statements)

References 7 publications

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“…Thermal energy storage using rock beds and phase change materials are successfully demonstrated by different authors [8][9][10][11]. However, the recent trend for continuous solar drying during off-sunshine hours is to incorporate desiccants in the drying process.…”

Section: Nomenclaturementioning

confidence: 98%

Experimental investigation of forced convection and desiccant integrated solar dryer

2006

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Section: Nomenclaturementioning

confidence: 98%

Experimental investigation of forced convection and desiccant integrated solar dryer

2006

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“…The duration of crop drying in the solar dryer was shorter than that in the open air. Chauhan et al [9] studied the drying characteristics of coriander in a stationary 0.5 tonne/batch capacity deep-bed dryer coupled to a solar air heater and a rock bed storage unit. The results revealed that for reducing the moisture content from 28.2 (d.b.)…”

Section: Introductionmentioning

confidence: 99%

Performance improvement studies in a solar greenhouse drier using sensible heat storage materials

Ayyappan¹,

Mayilsamy²,

Sreenarayanan³

2015

Heat Mass Transfer

103

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heat is stored when the material changes phase from solid to a liquid. Thermo-chemical storage is a technique, which involves chemical reactions.Sensible heat storage is the most simple and inexpensive way of energy storage system although there are few advantages of phase change energy storage over sensible heat storage, but the technological and economical aspects make sensible heat storage superior. Packed beds represent the most suitable storage units for air-based solar system. A packed bed storage system consists of loosely packed solid material through which the heat transport fluid is circulated. Heated fluid (usually air) flows from solar collectors into a bed of graded particles from top to bottom in which thermal energy is transferred during the charging phase.Solids have been reported as widely used storage materials on low temperature range. Energy can be stored up to 800 °C in sand, cast iron, steel, aluminium, aluminium oxide, magnesium oxide and granite. Metals have good conductive characteristics and thus require only a small heat transfer area. Sand and rocks on the other hand, need a relatively large heat transfer area. Solar greenhouse driers can be used very effectively for crop drying. Many studies have been conducted by the researchers in different regions of the world with different climatic conditions for the drying of fruits, vegetables, cereals, grains, oil seeds, spices, fish etc. using solar greenhouse dryer. Thermal energy storage either sensible or latent heat are required to improve the utility and performance of the solar greenhouse dryers. Many studies have been conducted by the researchers using various sensible heat storage materials like water tanks, gravel beds, ground, sand, concrete etc. where energy is stored in the form of sensible heat. Hasnain [1] reported that solid materials such as rocks, metals, concrete, sand and brick can be used for low as well as Abstract Experiments were conducted in a natural convection solar greenhouse dryer using different sensible heat storage materials (concrete, sand and rock-bed) in order to study their thermal performance. For both sand and rockbed, 4″ thickness was found to be optimum as it provides better drying environment both during day and night. The dryer reduced the moisture content of coconuts from 52 (w.b.) to 7 % (w.b.) using concrete as heat storage material in 78 h saving 55 % of drying time compared to open sun drying which takes 174 h for reducing the moisture content to the same level. The sand took 66 h saving 62 % of drying time whereas rock-bed took only 53 h thereby saving 69 % of drying time compared to open sun drying. The efficiency of the dryer was found to be 9.5, 11 and 11.65 % using concrete, sand and rock-bed respectively.

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“…Solar drying systems with sensible and latent heat storage are successfully demonstrated by many researchers [5][6][7][8]. Generally the equipment required to store and exchange heat by sensible and latent heat storage is not practical for solar drying.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of regenerative desiccant integrated solar dryer with and without reflective mirror

Shanmugam

Natarajan

2007

Applied Thermal Engineering

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Comparative performance of coriander dryer coupled to solar air heater and solar air-heater-cum-rockbed storage

Cited by 54 publications

References 7 publications

Experimental investigation of forced convection and desiccant integrated solar dryer

Experimental investigation of forced convection and desiccant integrated solar dryer

Performance improvement studies in a solar greenhouse drier using sensible heat storage materials

Experimental study of regenerative desiccant integrated solar dryer with and without reflective mirror

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