Some experiments on drying grain by solar radiation

Bailey, P. H.; Williamson, W. F.

doi:10.1016/0021-8634(65)90115-0

Cited by 10 publications

(1 citation statement)

References 3 publications

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“…Forced-convective greenhouse dryers are used for large-scale commercial applications (Huang and Bowers, 1977;Huang andToksoy, 1981, 1983;Huang, 1980;Ozisik et al, 1980;Müller et al, 1989;Taylor and Weir, 1985). There is a large diversity of forms from large-scale transparent roof ''solar barns" (Shove et al, 1981) to small-scale forced-convection dryers (Bailey and Williamson, 1965;Bassey, 1985;Umarav and Ikramov, 1978). For a active indirect solar dryer the components, are a drying chamber, air heating solar collector, fan and connecting ducts (Garg et al, 1994;Ong, 1982Ong, , 1999Roa and Macedo, 1976;Sharma et al, 1993;Tiris et al, 1994;Eissen and Miihlbauer, 1983;Fohr and Arnaud, 1992;Akachukwu, 1986;Plumptre, 1979;Calderwood, 1981;Pattanayak et al, 1978;Reddy et al, 1979;Smith, 1977;Trim and Ko, 1982;Bolin et al, 1978;Calderwood, 1981;Miller, 1985;Tiris et al, 1995;Tschernitz and Simpson, 1979).…”

Section: Active Forced-circulation Solar Energy Dryersmentioning

confidence: 99%

Solar dryers for tropical food preservation: Thermophysics of crops, systems and components

Tomar

Tiwari

Norton³

2017

Solar Energy

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Drying reduces the moisture content of harvested crops thus slowing decay processes to enable longerterm storage. Solar dryers contain the crop being dried, to enhance solar energy collection incurring lower crop losses than are associated with open-sun drying and recurrent costs than are inherent to uses of fossil-fuels for drying. The influences of key environmental, operational and design parameters for solar dryers are discussed including: (i) psychrometry of drying processes and ambient conditions, (ii) how initial crop properties are converted to final desired product attributes, (iii) feasibility of using powered components such as fans and (iv) air-heating solar collector selection.

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Section: Active Forced-circulation Solar Energy Dryersmentioning

confidence: 99%

Solar dryers for tropical food preservation: Thermophysics of crops, systems and components

Tomar

Tiwari

Norton³

2017

Solar Energy

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Flat-Plate and Evacuated Tube Collectors

Norton¹

2013

Lecture Notes in Energy

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The sun has got his hat on Hip hip hip hooray! The sun has got his hat on, and he's coming out to play Gay and Butler (1932) 5.1 Overview Solar-energy collectors are devices employed to gain useful heat energy from the incident solar radiation. They can be of the concentrating or the flat-plate type. A simple flat-plate solar energy collector consists basically of an absorbing surface which absorbs the insolation and transmit it in form of heat to a working fluid commonly air or water. A general steady-state analysis for flat-plate collectors is shown in Fig. 5.1.Instantaneous efficiencies are plotted against (T fii ÀT a )/I and the intercept and the slope determined (7.1.5). The long-term performance of many solar heating collectors can be characterized by a thus determined intercept and slope as shown by the illustrative examples for different collector types given in Fig. 5.2. These parameters are not constant but depend on temperature and wind speed. Heat removed is also a weak function of overall heat loss. To account for these effects non-linear equations have been developed and together with an angular dependent "incident angle modifier" are used in various versions as the basis for rating tests. These are shown in Fig. 5.3.The absorber material in a flat-plate collector, in addition to having a high absorbance of the incident radiation should also have a low emissivity, good thermal conductivity, and be stable thermally under temperatures encountered during operation and stagnation. It should also be durable, have low weight per unit area and, most importantly, be cheap. Black coated metal sheets (in air heater) and fins in water heaters are used frequently as absorbers due to their effectiveness, ease of use, availability and relatively low cost. Wisely or not, a multitude of

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