Comparative System Analysis of Direct Steam Generation and Synthetic Oil Parabolic Trough Power Plants With Integrated Thermal Storage

Feldhoff, Jan Fabian; Schmitz, Kai; Eck, Markus; Schnatbaum-Laumann, Lars; Laing, Doerte; Ortiz-Vives, Francisco; Schulte-Fischedick, Jan

doi:10.1115/es2011-54345

Cited by 29 publications

(44 citation statements)

References 7 publications

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“…The authors conclude that direct steam generation is more efficient than the other two. In spite of that, and although other alternatives are being studied [8][9][10][11][12][13][14], most of the PTC plants use some sort of synthetic oil, mainly due to its lower freezing point (around 12˝C) when compared to other HTFs.…”

Section: Description Of the Heat Transfer Fluid (Htf)-heating Processmentioning

confidence: 99%

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Dynamic Modeling of the Solar Field in Parabolic Trough Solar Power Plants

Barcia

Menéndez²,

Esteban

et al. 2015

Energies

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Parabolic trough solar power plants use a thermal fluid to transfer thermal energy from solar radiation to a water-steam Rankine cycle in order to drive a turbine that, coupled to an electrical generator, produces electricity. These plants have a heat transfer fluid (HTF) system with the necessary elements to transform solar radiation into heat and to transfer that thermal energy to the water-steam exchangers. In order to get the best possible performance in the Rankine cycle and, hence, in the thermal plant, it is necessary that the thermal fluid reach its maximum temperature when leaving the solar field (SF). Also, it is mandatory that the thermal fluid does not exceed the maximum operating temperature of the HTF, above which it degrades. It must be noted that the optimal temperature of the thermal fluid is difficult to obtain, since solar radiation can change abruptly from one moment to another. The aim of this document is to provide a model of an HTF system that can be used to optimize the control of the temperature of the fluid without interfering with the normal operation of the plant. The results obtained with this model will be contrasted with those obtained in a real plant.

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Section: Description Of the Heat Transfer Fluid (Htf)-heating Processmentioning

confidence: 99%

“…V air¨D e GLASS¨ρair µ air (10) where V air , ρ air , µ air are the air speed, density and dynamic viscosity respectively. Equation (11) is used to calculate thermal radiation transference from the outer surface of the metallic pipe to the inner wall of the glass cover .…”

mentioning

confidence: 99%

Dynamic Modeling of the Solar Field in Parabolic Trough Solar Power Plants

Barcia

Menéndez²,

Esteban

et al. 2015

Energies

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“…The concrete storage modules are used for preheating and superheating the steam and the PCM storage module is used to evaporate the heat transfer fluid. Integration of thermal storage system with power plant is considered favourable for the future market potential of such power plants (Feldhoff et al, 2012). Steam accumulators integrated with suitable latent heat storage material is a promising option for most of the process heat applications.…”

Section: Storage Technology and Hybrid Plant Configurationmentioning

confidence: 99%

Solar Thermal Power Sector

Viswanathan¹

2015

Proceedings of the Indian National Science Academy

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Solar power will play a significant role in India's future energy mix. In addition to be able to provide process heat, concentrated solar power (CSP) plays a unique role in India's energy production because of its potential to use hybrid technologies with biomass or fossil fuels. Thermal energy storage is another aspect of solar thermal technology which helps provide dispatchable and base-load power. The low pressure steam available at the outlet of the power turbine can be utilized for other processes such as air-conditioning and thermal desalination. At high temperatures that can be brought about by concentrating solar thermal technology, hydrogen gas can be produced which serves as a clean fuel. Despite many advantages, much more needs to be done to scale-up CSP sustainably. Innovation and indigenization can address some of the barriers that pose challenges for the development of CSP market in India.

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“…However, its use in CSP application remains in RandD stage and it is mostly used as a preferred heat transfer fluid in low and medium temperature solar collector [94,95].…”

Section: Watermentioning

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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Comparative System Analysis of Direct Steam Generation and Synthetic Oil Parabolic Trough Power Plants With Integrated Thermal Storage

Cited by 29 publications

References 7 publications

Dynamic Modeling of the Solar Field in Parabolic Trough Solar Power Plants

Dynamic Modeling of the Solar Field in Parabolic Trough Solar Power Plants

Solar Thermal Power Sector

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

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