Experimental and analytical thermal analysis of cylindrical cavity receiver for solar dish

Azzouzi, Djelloul; Boumeddane, Boussad; Abene, Abderahmane

doi:10.1016/j.renene.2016.12.102

Cited by 80 publications

(27 citation statements)

References 13 publications

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“…Conduction heat loss from receiver is from bottom and curved surface (radial direction) of the receiver through the insulation. The conduction heat loss from the bottom and radial surface is estimated as [6] The heat loss resistance from the bottom and radial surface of the receiver is shown in figs. 5 and 6.…”

Section: Conduction Heat Loss Through the Receiver Wallmentioning

confidence: 99%

“…The heat loss by natural convection was observed to be more sensitive to the cavity inclination as compared to heat losses by radiation and conduction in constant heat flux boundary condition. Azzouzi et al [6] also presented the experimental and analytical study on the helical coil cavity receiver with non-uniform high temperature wall condition. Most of the numerical and experimental studies on heat loss are performed on cylindrical cavity receivers, used for isothermal wall condition and high temperature applications (>400 C) such as power generation, which cannot give accurate heat loss estimation for tubular cavity receivers for low and medium temperature process heat applications.…”

Section: Introductionmentioning

confidence: 99%

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Heat loss analysis of three coil cylindrical solar cavity receiver of parabolic dish for process heat

Sinha¹,

Gulhane²,

Taler

et al. 2019

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI19S4301SThe share of solar thermal energy for process heat at sub cooled temperature is estimated about 30% of the total demand. The assessment of heat loss from tubular receiver used for the process heat is necessary to improve the thermal efficiency and consequently the cost effectiveness of the parabolic dish receiver system. The study considers a modified three coil solar cavity receiver of wall area three times (approximately) as compared to the existing single coil receiver and experimentally investigates the effect of increases in cavity inner wall area, fluid inlet temperature (50-75 ºC), and cavity inclination angle (θ = 0-90º) on the combined (total) heat loss from receiver under no wind condition. This paper also develops an analytical model to estimate the different mode of heat losses from the downward facing receiver. In the mean fluid temperature range of 50 ºC to 70 ºC, the total heat loss from three coil receiver is reduced up to 40.98% at 90º and 20% at 0º inclination, as compared to single coil receiver. The analytical modeling estimates very low heat loss from conduction (1-3%) and radiation (2-8%) and high heat loss from convection (97-89%). The heat loss by natural convection decreases sharply with increase in cavity inclination, while the heat loss by radiation and conduction increases slowly with inclination. A three coil cavity receiver might be considered in the design to reduce heat loss from parabolic dish receiver system to improve the thermal performance and cost effectiveness.

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Section: Conduction Heat Loss Through the Receiver Wallmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat loss analysis of three coil cylindrical solar cavity receiver of parabolic dish for process heat

Sinha¹,

Gulhane²,

Taler

et al. 2019

THERM SCI

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“…The highest optical efficiency was obtained with the conical receiver. Azzouzi et al (2017) experimentally and analytically studied the influence of the receiver inclination angle, water flow rate within the receiver, solar concentration ratio, and report/ ratio between the cavity depth and the aperture diameter L/D on the total heat loss and thermal efficiency of a downward-facing cavity receiver. The experimental and analytical thermal efficiency estimates are in relatively good agreement, with a maximum deviation of $12%.…”

Section: Introductionmentioning

confidence: 99%

“…Azzouzi et al. (2017) experimentally and analytically studied the influence of the receiver inclination angle, water flow rate within the receiver, solar concentration ratio, and report/ratio between the cavity depth and the aperture diameter L/D on the total heat loss and thermal efficiency of a downward-facing cavity receiver.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the receiver of a solar thermal dish collector with a dual layer, staggered tube arrangement, and multiscale diameter

Dulaimi

2020

Energy Exploration & Exploitation

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A new experimental model is proposed and tested to enhance the ability of receivers of solar thermal dish collectors in absorbing solar energy. An innovative model consisting of a dual layer, staggered arrangement, and multiscale diameter tubes is established. The enhancement augments the capability of the solar receiver of the collector to transform solar energy to thermal energy within the heat transfer fluid. The new design depends on the exploitation of the dead regions of the solar receiver, that is, surfaces with weak solar energy absorption which include the space between the pipes and the terminal sides of the pipes. The surface areas of the circular pipes in these regions are almost parallel to the solar energy radiation, which leads to a reduction in the ability of the tube to absorb solar energy. The design was validated through five receiver ([Formula: see text]) models for solar thermal dish collectors, in addition to the model base (which has single layer). Each model consists of a two-layer staggered arrangement and tubes with four different staggered diameter ratios [Formula: see text] between the two layers. Each of them has an octagonal shape and consists of three serial paths of copper tubes; each path consists of a bank of parallel tubes. The results show a noteworthy increase in the ability of the receiver to absorb solar energy and greater with model ([Formula: see text]) which [Formula: see text]equal (0.269) than for a plain tube collector. The enhancement leads to an increase in the thermal efficiency [Formula: see text]and exergetic performance [Formula: see text], that equal (78.8%) and (19.8%) respectively at (0.07 kg/s). Furthermore, the pressure difference, and efficiency evaluation criterion was estimated to evaluate dish collector receivers.

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“…Cylindrical (Wang et al 2013;Azzouzi et al 2017;Karimi et al 2018;Loni et al 2018b, a;Soltani et al 2019), conical (Li et al 2015a;Pavlovic et al 2018;Awasthi andKhan 2019), spherical (Si-Quan et al 2018), modified cavity receivers (Sendhil Kumar and Reddy 2007a;Sendhil Kumar 2008, 2009;Reddy 2014, 2015;Reddy et al 2015cReddy et al , b, 2016 are some of the frequently used receiver types.…”

mentioning

confidence: 99%

Comparative study of modified conical cavity receiver with other receivers for solar paraboloidal dish collector system

Kopalakrishnaswami¹,

Natarajan²

2021

Environ Sci Pollut Res

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Solar Parabolic Dish Concentrators are one of the most efficient solar power conversion technologies. The cavity receivers are most common type, used for reducing the heat losses from the receiver. In this paper a novel cavity receiver is proposed and the objective is to compare the novel modified conical cavity receiver with the existing cavity receivers such as cylindrical, conical and modified cavity receivers. The cavity receivers are designed for the parabolic dish of 4m diameter which is installed at National Institute of Technology Puducherry, India. Ray tracing analysis is carried out to determine the size of the receiver. The analysis was carried out for various orientations of the receivers from 0° to 90° with a step size of 15° and also for the cavity temperatures: 300℃, 400℃, 500℃, 600℃ and 700℃. Based on the results obtained the modified conical cavity receiver is found to be the best design in terms of minimum heat losses compared to other receivers. The next best choices are found to be modified cavity, conical cavity and cylindrical cavity receiver. The whole analysis is conducted with a developed model in COMSOL Multiphysics.

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Experimental and analytical thermal analysis of cylindrical cavity receiver for solar dish

Cited by 80 publications

References 13 publications

Heat loss analysis of three coil cylindrical solar cavity receiver of parabolic dish for process heat

Heat loss analysis of three coil cylindrical solar cavity receiver of parabolic dish for process heat

Experimental investigation of the receiver of a solar thermal dish collector with a dual layer, staggered tube arrangement, and multiscale diameter

Comparative study of modified conical cavity receiver with other receivers for solar paraboloidal dish collector system

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