Solar linear Fresnel collector using molten nitrates as heat transfer fluid

Grena, Roberto; Tarquini, P.

doi:10.1016/j.energy.2010.12.003

Cited by 120 publications

(59 citation statements)

References 15 publications

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“…The mirrors are usually aligned on a north-south axis, and rotated to track the sun during it daily movement; they are oriented toward the sun to concentrate solar rays on the receiver tubes, which contains the liquid heated to high temperature by the absorbed energy; these hot fluids can be used for many purposes, domestic and industrial [34][35][36]. Figure 1 shows a photo of a linear Fresnel concentrator prototype, it was constructed in the Saad DAHLEB University, Blida 1 (beside the department of mechanics).…”

Section: Design Of the Concentratormentioning

confidence: 99%

Design and experimental study of a solar system for heating water utilizing a linear Fresnel reflector

Ghodbane¹,

Boumeddane²,

Settou³

2018

J. Fundam and Appl Sci.

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This work presents a design and an experimental study of a linear Fresnel reflector solar with trapezoidal cavity. This prototype is used for heating the tap water. The reflector was designed, constructed and tested in mechanical engineering department, University of Blida 1, Algeria.Various combinations of reflecting mirrors were tried to achieve hot temperature at the concentration line. The absorber tube was made of copper; it was painted with black paint and covered by selective suitable surface. The quantity of heat available to the absorber tubes was evaluated and compared with 7, 9 and 11 mirrors. The experimental works on the concentrator were accomplished within two days in the winter of 2015. Water temperature reached a maximum of 74°C with eleven reflective mirrors. The maximum value of the thermal efficiency is 29.21%. The results obtained are very encouraging for using linear Fresnel concentrator in the solar fields allocated to the domestics and industrial water-heaters.

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Section: Design Of the Concentratormentioning

confidence: 99%

Design and experimental study of a solar system for heating water utilizing a linear Fresnel reflector

Ghodbane¹,

Boumeddane²,

Settou³

2018

J. Fundam and Appl Sci.

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“…However, salts suffer from certain major disadvantages in that they have a high freezing point of about 250°C, which requires lot of auxiliary power during shut-off periods to keep them in molten state and is thus a huge maintenance problem. Further, owing to their corrosive nature, they require expensive operational machineries and system engineering in terms of pipings, pumps, joints etc for their efficient operation [103][104][105][106][107][108][109][110]. Molten salts have been used as heat transfer fluids in solar towers in a number of concentrated power plants around the world.…”

Section: Molten Saltsmentioning

confidence: 99%

Recent Developments in Heat Transfer Fluids Used for Solar Thermal Energy Applications

Srivastva¹,

Malhotra²,

Sc³

2015

J Fundam Renewable Energy Appl

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Solar thermal collectors are emerging as a prime mode of harnessing the solar radiations for generation of alternate energy. Heat transfer fluids (HTFs) are employed for transferring and utilizing the solar heat collected via solar thermal energy collectors. Solar thermal collectors are commonly categorized into low temperature collectors, medium temperature collectors and high temperature collectors. Low temperature solar collectors use phase changing refrigerants and water as heat transfer fluids. Degrading water quality in certain geographic locations and high freezing point is hampering its suitability and hence use of water-glycol mixtures as well as water-based nano fluids are gaining momentum in low temperature solar collector applications. Hydrocarbons like propane, pentane and butane are also used as refrigerants in many cases. HTFs used in medium temperature solar collectors include water, waterglycol mixtures -the emerging "green glycol" i.e., trimethylene glycol and also a whole range of naturally occurring hydrocarbon oils in various compositions such as aromatic oils, naphthenic oils and paraffinic oils in their increasing order of operating temperatures. In some cases, semi-synthetic heat transfer oils have also been reported to be used. HTFs for high temperature solar collectors are a high priority area and extensive investigations and developments are occurring globally. In this category, wide range of molecules starting from water in direct steam generation, air, synthetic hydrocarbon oils, nanofluid compositions, molten salts, molten metals, dense suspension of solid silicon carbide particles etc., are being explored and employed. Among these, synthetic hydrocarbon oils are used as a fluid of choice in majority of high temperature solar collector applications while other HTFs are being used with varying degree of experimental maturity and commercial viability -for maximizing their benefits and minimizing their disadvantages. Present paper reviews the recent developments taking place in the area of heat transfer fluids for harnessing solar thermal energy. Refrigerants/phase changing materials: These are low boiling point but high heat capacity substances used in the solar collectors to transfer heat in applications like solar space cooling and heating, refrigerators, air conditioning, etc [7]. These materials absorb heat from the solar collectors, produce work either by expanding in a turbo-generator of a vapor compression cycle or by dissociating the refrigerant from its absorbent in a vapor absorption cycle [8]. In some of the relatively high temperature applications, higher boiling point refrigerants are used as indirect heat transfer fluids, wherein the heat collected from the solar collectors is transferred to another fluid like water from where the refrigerants pick-up heat to do the required work in the turbo-generators [9,10]. Recent Developments in Heat Transfer

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“…Nitrate salts have many favorable properties for solar applications: low corrosion rate with common piping materials, thermal stability in the upper temperature range of the steam Rankine cycle, good heat transfer properties, very low vapor pressure, wide availability, low environmental impact and they are relatively inexpensive [6,7]. The controllability of the solar field is easier in the case of liquid one-phase flow than in the case of two-phase flow in DSG [8].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, freeze protection is required, such as preheating the piping with Joule and trace heating, salt recirculation, external burner and draining of the salt. [4,7] In the case of molten salt, LFC technology has some advantages with respect to PTC technology, such as fixed receiver, higher concentration factor and easier salt drainage, described more closely in [4,6]. With respect to solar tower technology, control issues are easier to handle due to lower concentration factor, which can though be compensated by lower heat loss, risk of salt freezing is lower and auxiliary power for pumping is smaller [4].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic modelling and simulation of linear Fresnel solar field model based on molten salt heat transfer fluid

Hakkarainen

Tähtinen

2016

AIP Conference Proceedings

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Recently, molten salts have been proposed to be used as HTF and directly as storage medium in both line-focusing solar fields, offering storage capacity of several hours. This direct molten salt (DMS) storage concept has already gained operational experience in solar tower power plant, and it is under demonstration phase both in the case of LFC and PTC systems. Dynamic simulation programs offer a valuable effort for design and optimization of solar power plants. In this work, APROS dynamic simulation program is used to model a DMS linear Fresnel solar field with two-tank TES system, and example simulation results are presented in order to verify the functionality of the model and capability of APROS for CSP modelling and simulation.

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Solar linear Fresnel collector using molten nitrates as heat transfer fluid

Cited by 120 publications

References 15 publications

Design and experimental study of a solar system for heating water utilizing a linear Fresnel reflector

Design and experimental study of a solar system for heating water utilizing a linear Fresnel reflector

Recent Developments in Heat Transfer Fluids Used for Solar Thermal Energy Applications

Dynamic modelling and simulation of linear Fresnel solar field model based on molten salt heat transfer fluid

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