A novel optical-thermal modeling of a parabolic dish collector with a helically baffled cylindrical cavity receiver

Soltani, Sara; Bonyadi, Mohammad; Avargani, Vahid Madadi

doi:10.1016/j.energy.2018.11.097

Cited by 71 publications

(13 citation statements)

References 30 publications

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“…For this reason, the proper design of this focal point and the good choice of its location are very important and vital factor. Therefore, many recent scientific studies focus on improving the focus point design of the PDC [45,46]. In addition, the PDC technology can be connected with Stirling engine, where Advanco Corporation developed Dish/Stirling solar concentrating technology between 1984 and 1988.…”

Section: Parabolic Dish Collectors (Pdcs)mentioning

confidence: 99%

Brief on Solar Concentrators: Differences and Applications

Ghodbane¹,

Benmenine²,

Khechekhouche³

et al. 2020

I2M

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In light of the global crises that the world suffers from, the renewable energy exploitation is a viable solution to remedy the various energy crises, knowing that renewable energy is a source of environmental credibility, as it does not cause any pollution or any emissions harmful to the environment. Among the most important renewable energy sources, solar energy is the most important type as it can be exploited thermally by adopting various solar collectors, especially solar concentrators. This paper has been devoted to illustrate the types of solar concentrators, namely point-focus concentrators (Heliostat Field Collectors and Parabolic Dish Collectors) and linear concentrators (Linear Fresnel Reflectors and Parabolic Trough Collectors), in an attempt to clarify its principle and its multiple uses domestically and industrially, especially in areas that are characterized by the abundance of its direct solar radiation. The solar concentrator is a solar thermal energy concentration system, because its use reduces the consumption of fossil fuels harmful to the environment and directly contributes to climate change. Solar thermal concentrators are an effective alternative to fossil generators for thermal energy, as they have many important uses such as the solar electricity production of solar electricity in power plants, industrial and domestic water heating, and have many other industrial uses.

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Section: Parabolic Dish Collectors (Pdcs)mentioning

confidence: 99%

Brief on Solar Concentrators: Differences and Applications

Ghodbane¹,

Benmenine²,

Khechekhouche³

et al. 2020

I2M

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show abstract

“…The position of flux-maxima has been shifted deep inside the cylindrically shaped cavity by shifting focus inside the cavity aperture plane. On finding the actual distribution of solar radiative heat flux inside the cylindrical shaped receiver, Soltani et al (2019) have optimized the parameters; ratio of cavity aperture distance to the focus location, concentration-ratio, height (length) to diameter ratio of a cavity, temperature of HTF at entry, a flow rate of HTF and the intensity of solar radiation, which enhanced the performance of a PDC system up equal to 65.0%. The system thermal efficiency showed a linearly reducing trend with the rise of temperature of HTF at entry, on account of increased heat losses.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance analysis of a Solar parabolic dish concentrator system with modified cavity receiver

Kumar

Bopche

2021

WJE

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Purpose This paper aims to present the numerical models and experimental outcomes pertain to the performance of the parabolic dish concentrator system with a modified cavity-type receiver (hemispherical-shaped). Design/methodology/approach The numerical models were evolved based on two types of boundary conditions; isothermal receiver surface and non-isothermal receiver surface. For validation of the numerical models with experimental results, three statistical terms were used: mean of absolute deviation, R2 and root mean square error. Findings The thermal efficiency of the receiver values obtained using the numerical model with a non-isothermal receiver surface found agreeing well with experimental results. The numerical model with non-isothermal surface boundary condition exhibited more accurate results as compared to that with isothermal surface boundary condition. The receiver heat loss analysis based on the experimental outcomes is also carried out to estimate the contributions of various modes of heat transfer. The losses by radiation, convection and conduction contribute about 27.47%, 70.89% and 1.83%, in the total receiver loss, respectively. Practical implications An empirical correlation based on experimental data is also presented to anticipate the effect of studied parameters on the receiver collection efficiency. The anticipations may help to adopt the technology for practical use. Social implications The developed models would help to design and anticipating the performance of the dish concentrator system with a modified cavity receiver that may be used for applications e.g. power generation, water heating, air-conditioning, solar cooking, solar drying, energy storage, etc. Originality/value The originality of this manuscript comprising presenting a differential-mathematical analysis/modeling of hemispherical shaped modified cavity receiver with non-uniform surface temperature boundary condition. It can estimate the variation of temperature of heat transfer fluid (water) along with the receiver height, by taking into account the receiver cavity losses by means of radiation and convection modes. The model also considers the radiative heat exchange among the internal ring-surface elements of the cavity.

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“…Soltani et al. (2019) experimentally and theoretically studied the thermal performance of a helically baffled cylindrical 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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A novel optical-thermal modeling of a parabolic dish collector with a helically baffled cylindrical cavity receiver

Cited by 71 publications

References 30 publications

Brief on Solar Concentrators: Differences and Applications

Brief on Solar Concentrators: Differences and Applications

Thermal performance analysis of a Solar parabolic dish concentrator system with modified cavity receiver

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

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