Molten Salt as a Heat Transfer Fluid in a Linear Fresnel Collector – Commercial Application Backed by Demonstration

Morin, G.; Karl, Martin; Mertins, M.; Selig, Michael S.

doi:10.1016/j.egypro.2015.03.079

Cited by 39 publications

(10 citation statements)

References 3 publications

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“…The flow behavior of molten salt is similar to water, so that almost the same time period can be estimated roughly for the drainage time of molten salt in this pipe. Considering the tilt angle this rough estimation coincides with the results of drainage tests by Novatec Solar GmbH, where a 550m horizontal 70mm-pipe (filled with Hitec-Salt) was drained in about 12 minutes [4]. Overall a 70mm pipe filled with solar salt of 290°C takes about 1 hour to cool down to 240°C, which is still 17K above the freezing point, assuming average heat losses of 150W/m.…”

Section: Solar Field Drainagesupporting

confidence: 58%

New operating strategies for molten salt in line focusing solar fields - Daily drainage and solar receiver preheating

Eickhoff¹,

Meyer-Grünefeldt²,

Keller³

2016

AIP Conference Proceedings

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Abstract. Nowadays molten salt is efficiently used in point concentrating solar thermal power plants. Line focusing systems still have the disadvantage of elevated heat losses at night because of active freeze protection of the solar field piping system. In order to achieve an efficient operation of line focusing solar power plants using molten salt, a new plant design and a novel operating strategy is developed for Linear Fresnel-and Parabolic Trough power plants. Daily vespertine drainage of the solar field piping and daily matutinal refilling of the solar preheated absorber tubes eliminate the need of nocturnal heating of the solar field and reduce nocturnal heat losses to a minimum. The feasibility of this new operating strategy with all its sub-steps has been demonstrated experimentally.

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Section: Solar Field Drainagesupporting

confidence: 58%

New operating strategies for molten salt in line focusing solar fields - Daily drainage and solar receiver preheating

Eickhoff¹,

Meyer-Grünefeldt²,

Keller³

2016

AIP Conference Proceedings

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“…DSG systems use water/steam as HTF . The solar field is arranged into several parallel loops, where each loop is composed of a series of collector modules.…”

Section: Approachmentioning

confidence: 99%

Design, economic, and environmental assessments of linear Fresnel solar power plants

Mihoub

2019

Env Prog and Sustain Energy

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In the present work, the design-environmental and economic (D2E) comparative study of seven different configurations of Linear Fresnel solar thermal power plants using two-generation modes (direct and indirect steam generation) with nine various working fluids, with and without integrated thermal energy storage or/and backup fuel system is presented, with minimum levelized cost of energy (LCOE) as objective.This study is based on a power plant of capacity of 50 MW. A sensitivity analysis is developed to optimize the solar multiple of the solar field, Fossil fuel fraction of backup system (BS), and TES hours capacity, using System Advisor Model software.The results show that the wrong choice of plant's components and inexact performance optimization lead to the increasing cost of electricity generated due to operating costs and additional investments. The BS was the most significant contributor to greenhouse gas emissions at all sites, contributing over 90% of total emissions, due to its relative contribution (95 kg/MWh). Finally, the combination of the storage and BSs in molten salt mode makes it more competitive under Algerian climates, which confirms that molten salt linear Fresnel solar plant with 25% of a BS and 6 hr of the storage system is the best and optimum solution. K E Y W O R D S levelized cost of electricity, assessment, linear Fresnel plant, system advisor model 1 | INTRODUCTION The 2015 United Nations Climate Conference in Paris marked a turning point for renewable energy (RE). It reinforced what advocates have long argued: That a rapid and global transition to RE technologies offers a realistic means to achieve sustainable development and avoid catastrophic climate change. 1 Moreover, RE technologies can help countries meet their policy goals for secure, reliable and affordable energy, electricity access for all, reduced price volatility, and the promotion of social and economic development. 2 In Algeria, With the development of economy and the rapidly increasing of electricity demand, environmental issues, and fossil energy shortage are becoming increasingly serious, which allows the government to use other sources as REs. Therefore, the challenge facing governments has shifted from identifying what needs to be done and how best to achieve it.Different questions can be given for the electricity system by variable renewable, but the principle is the same: A mix of technologies in a range of locations will be required to meet the demand that varies

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“…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%

“…The indirect molten salt storage system exploited in the currently operating PT plants is already commercial technology, and the solar tower technology with direct molten salt (DMS) storage system is implemented in commercial scale in Gemasolar power plant [3]. First DMS demonstration plants are already constructed for testing, by Novatec Solar based on the LFC technology [4] and by Archimede Solar Energy based on the PTC technology [5].…”

Section: Introductionmentioning

confidence: 99%

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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Molten Salt as a Heat Transfer Fluid in a Linear Fresnel Collector – Commercial Application Backed by Demonstration

Cited by 39 publications

References 3 publications

New operating strategies for molten salt in line focusing solar fields - Daily drainage and solar receiver preheating

New operating strategies for molten salt in line focusing solar fields - Daily drainage and solar receiver preheating

Design, economic, and environmental assessments of linear Fresnel solar power plants

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

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