Measurement of rock pile heat transfer coefficients

Alanís, Elvio; Saravia, Luis; Rovetta, Leticia

doi:10.1016/0038-092x(77)90114-1

Cited by 23 publications

(6 citation statements)

References 2 publications

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“…This heat transfer can be determined in two ways namely, (a) on the basis of area of crop for thin layer and (h) on the basis of volume of grain bed for deep bed drying Alanis et al (1977) studied heat transfer in rock pile, hut with lower air flow Fetes. Wang eta1 (1979) measured the convective heat transfer coefficient in packed bed of rice.…”

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confidence: 99%

Heat and Mass Transfer Relations for Crop Drying

Goyal

Tiwari

1998

Drying Technology

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In present communication, an attempt has been made to study the heat and mass transfer for crops namely wheat and gram. The removal of moisture from the crop was determined under simulated conditions and it was used to develop heat and mass transfer relation using linear as well as multiple regression analysis. The observations were recorded for relative humidity, temperature of crop and air and for moisture evaporated. Experimental error in terms of per cent uncenainty was calculated for recorded data which is in the range of 20 -30 per cent for forced convection and natural cooling, respectively.

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confidence: 99%

Heat and Mass Transfer Relations for Crop Drying

Goyal

Tiwari

1998

Drying Technology

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“…The thermo-physical properties of air are calculated using high-order polynomial fits of tabulated data (Incropera et al, 2007). The convective heat transfer in the packed bed of rocks is calculated using the correlation of (Alanis et al, 1976), which was developed for similar particle sizes (d = 2.1-5.8 cm), void fraction (e = 0.421), and Reynolds numbers (10 < Re 0 < 200) as encountered in the present work,…”

Section: Modelingmentioning

confidence: 99%

Experimental and numerical investigation of combined sensible–latent heat for thermal energy storage at 575°C and above

et al. 2015

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“…Various rock-to-fluid convective heat transfer correlations have been proposed for different flow conditions (Alanis et al, 1977;Coutier and Farber, 1982;Löf and Hawley, 1948;Pfeffer, 1964). It has been found that hv may significantly affect the final results.…”

Section: Volumetric Solid-fluid Convective Heat Transfer Coefficients (Hv)mentioning

confidence: 99%

High performance integrated receiver-storage system for concentrating solar power beam-down system

et al. 2019

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Concentrating solar power systems (CSP) with thermal storage units can provide dispatchable power. Here we propose a new modified design of a cavity receiver combined with a thermocline heat storage unit for the beam-down CSP. Instead of using a separate receiver and heat storage unit, an integrated unit consisting of an extended cylindrical cavity with a packed bed storage is proposed. The new approach was designed using validated cavity radiation and quasi-1D 2-phase numerical heat transfer models. As the concentrated irradiation can be directly absorbed in such a system, the structure used can be simplified and operation of the unit is more effective.A high solar-to-exergy conversion ratio of 0.52 was reached with an optimized design, charging and discharging efficiencies being well beyond 99% and 92% at 770℃. An important detail in the integrated receiver-storage design was the use of a circulation air flow fan, which enhanced the heat transfer inside the packed bed storage. The proposed new design is promising for improving the efficiency and economics of beam down CSP.

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Measurement of rock pile heat transfer coefficients

Cited by 23 publications

References 2 publications

Heat and Mass Transfer Relations for Crop Drying

Heat and Mass Transfer Relations for Crop Drying

Experimental and numerical investigation of combined sensible–latent heat for thermal energy storage at 575°C and above

High performance integrated receiver-storage system for concentrating solar power beam-down system

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