Direct steam generation in parabolic troughs: Final results and conclusions of the DISS project

Zarza, Eduardo; Valenzuela, Loreto; Leon, J.M. Ponce de; Hennecke, Klaus; Eck, Markus; Weyers, H.-Dieter; Eickhoff, Martin

doi:10.1016/s0360-5442(03)00172-5

Cited by 224 publications

(87 citation statements)

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“…According to the typical operation procedure the solar field is supplied with a surplus of feed water, so that only a part of the water is evaporated in the absorbers. [1][2][3][4]. This secures enough cooling of the absorbers to avoid overheating, which would occur at a dry-out of the absorbers.…”

Section: Technical Descriptionmentioning

confidence: 99%

Solar process steam for a pharmaceutical company in Jordan

Berger

Mokhtar

Zahler

et al. 2016

AIP Conference Proceedings

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Section: Technical Descriptionmentioning

confidence: 99%

Solar process steam for a pharmaceutical company in Jordan

Berger

Mokhtar

Zahler

et al. 2016

AIP Conference Proceedings

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“…In fact, alternative solar thermal plants using water and water-vapor as heat transfer fluids have been successfully operated for more than 4000 hours through the Direct Solar Steam (DISS) project [17]. The alternative system, the so-called direct steam generation (DSG) solar thermal plants, will be separately discussed in Section 4: Direct Steam.…”

Section: 1 E V a L U A T I O N O F H E A T T R A N S F E R F L U I D Smentioning

confidence: 99%

Heat Transfer Fluids

Lenert

Nam

Wang

2012

Annual Rev Heat Transfer

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The choice of heat transfer fluids has significant effects on the performance, cost and reliability of solar thermal systems. In this chapter, we evaluate existing heat transfer fluids such as oils and molten salts based on a new figure of merit capturing the combined effects of thermal storage capacity, convective heat transfer characteristics and hydraulic performance of the fluids.Thermal stability, freezing point and safety issues are also discussed. Through a comparative analysis, we examine alternative options for solar thermal heat transfer fluids including watersteam mixtures (direct steam), ionic liquids/melts and suspensions of nanoparticles (nanofluids), focusing on the benefits and technical challenges. DOI: 10.1615/AnnualRevHeatTransfer.2012004122 SOURCE: Lenert, Andrej, Youngsuk Nam, and Evelyn N. Wang. "Heat Transfer Fluids." Annual Review of Heat Transfer 15, 2012. 2 DOI: 10.1615/AnnualRevHeatTransfer.2012004122 SOURCE: Lenert, Andrej, Youngsuk Nam, and Evelyn N. Wang. "Heat Transfer Fluids." Annual Review of Heat Transfer 15, 2012. 3 V averaged bulk velocity (ms -1 )

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“…Concentrated solar technologies offer promising opportunities for efficient solar-driven power generation systems (e.g., concentrated solar power (CSP) [1][2][3][4][5], solar thermochemical fuel production (STFP) [6][7][8][9][10], or solar driven high-temperature electrolysis (SHTE) [11]). The solar receiver is a key component in these applications converting solar energy efficiently into thermal energy.…”

Section: Introductionmentioning

confidence: 99%

Modeling and design guidelines for direct steam generation solar receivers

et al. 2018

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• A computational model for solar receiver for direct steam generation is developed.• Experiments are conducted and used to validate the model.• Practical designs, operational conditions and material choices are investigated.• Model provides design tool for direct steam generation solar cavity receivers. A R T I C L E I N F OKeyword: Solar energy Multi-mode heat transfer modeling Two-phase flow modeling Solar receiver Steam generator Concentrated solar A B S T R A C T Concentrated solar energy is an ideal energy source for high-temperature energy conversion processes such as concentrated solar power generation, solar thermochemical fuel production, and solar driven high-temperature electrolysis. Indirectly irradiated solar receiver designs utilizing tubular absorbers enclosed by a cavity are possible candidates for direct steam generation, allowing for design flexibility and high efficiency. We developed a coupled heat and mass transfer model of cavity receivers with tubular absorbers to guide the design of solardriven direct steam generation. The numerical model consisted of a detailed 1D two-phase flow model of the absorber tubes coupled to a 3D heat transfer model of the cavity receiver. The absorber tube model simulated the flow boiling phenomena inside the tubes by solving 1D continuity, momentum, and energy conservation equations based on a control volume formulation. The Thome-El Hajal flow pattern maps were used to predict liquid-gas distributions in the tubular cross-sections, and heat transfer coefficients and pressure drop along the tubes. The heat transfer coefficient and fluid temperature of the absorber tubes' inner surfaces were then extrapolated to the circumferential of the tube and used in the 3D cavity receiver model. The 3D steady state model of the cavity receiver coupled radiative, convective, and conductive heat transfer. The complete model was validated with experimental data and used to analyze different receiver types and designs made of different materials and exposed to various operational conditions. The proposed numerical model and the obtained results provide an engineering design tool for cavity receivers with tubular absorbers (in terms of tube shapes, tube diameter, and water-cooled front), support the choice of best-performant operation (in terms of radiative flux, mass flow rate, and pressure), and aid in the choice of the component materials. The model allows for an indepth understanding of the coupled heat and mass transfer in the solar receiver for direct steam generation and can be exploited to quantify the optimization potential of such solar receivers.

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Direct steam generation in parabolic troughs: Final results and conclusions of the DISS project

Cited by 224 publications

References 1 publication

Solar process steam for a pharmaceutical company in Jordan

Solar process steam for a pharmaceutical company in Jordan

Heat Transfer Fluids

Modeling and design guidelines for direct steam generation solar receivers

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