Comparison of Heat Transfer Fluid and Direct Steam Generation technologies for Integrated Solar Combined Cycles

Rovira, Antonio; Montes, María José; Varela, Fernando; Gil, Miguel

doi:10.1016/j.applthermaleng.2012.12.008

Cited by 105 publications

(47 citation statements)

References 26 publications

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“…Rovira et al [11] assessed a number of ISCC configurations with solar parabolic trough collectors and found that the direct steam generation (DGS) configuration is the best choice for solar energy integration. However, there are a number of challenges associated with this configuration such as control of solar field during solar radiation transients, two-phase flow inside the receiver tubes, and temperature gradients in the receiver tubes [40].…”

Section: Literature Reviewmentioning

confidence: 99%

Integrated Solar Combined Cycle Power Plants: Paving the way for thermal solar

Alqahtani

Patiño‐Echeverri

2016

Applied Energy

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Integrated Solar Combined Cycle Power Plants (ISCCs), composed of a Concentrated Solar Power (CSP) plant and a Natural Gas-fired Combined Cycle (NGCC) power plant, have been recently introduced in the power generation sector as a technology with the potential to simultaneously reduce fossil fuel usage and the integration costs of solar power. This study quantifies the economic benefits of an ISCC power plant relative to a stand-alone CSP with energy storage, and a NGCC plant. A combination of tools is used to estimate the levelized cost of electricity (LCOE) and the cost of carbon abatement (CoA) for CSP, NGCC and ISCC technologies under different natural gas prices, and at several locations experiencing different ambient temperatures and solar resources. Results show that an ISCC with up to 10-15% of nameplate capacity from solar energy can be cost effective as a dispatchable electricity generation resource.Integrating the CSP into an ISCC reduces the LCOE of solar-generated electricity by 35-40% relative to a stand-alone CSP plant, and provides the additional benefit of dispatchability. An ISCC also outperforms a CSP with energy storage in terms of LCOE and CoA. The current LCOE of an ISCC is lower than that of a stand-alone NGCC when fuel price reaches 13.5 $/MMBtu, while its CoA is lower at a fuel price of 8.5 $/MMBtu.Although, under low to moderate natural gas price conditions an NGCC generates electricity and abates carbon emissions at a lower cost than an ISCC; small changes in v the capacity factor of an ISCC relative to the NGCC, or capital cost reductions for the CSP component have great impact tilting the balance in the ISCC's favor.

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Section: Literature Reviewmentioning

confidence: 99%

Integrated Solar Combined Cycle Power Plants: Paving the way for thermal solar

Alqahtani

Patiño‐Echeverri

2016

Applied Energy

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“…The model allows the calculation of the thermal power and thermal efficiency of the collector. The latter results a function of the temperature of the fluid inside the tubes [31]: Like in Reference [19], the nominal solar thermal power is set to 50 MW th . For that, the ISCC configuration requires 82,632 m 2 of reflectors in about 260,000 m 2 of land [31].…”

Section: Simulation Of Ptcmentioning

confidence: 99%

“…In the case of solar integration into the steam cycle (Figure 1a), namely PTC-DSG, the configuration corresponds to the conventional ISCCs. Solar energy is used to boil part of the water of the high pressure level in parallel with the corresponding evaporator of the HRSG (which is the optimum layout for solar integration into the steam cycle [31,32]). …”

Section: Reference Ccgtmentioning

confidence: 99%

Comparison of Different Technologies for Integrated Solar Combined Cycles: Analysis of Concentrating Technology and Solar Integration

et al. 2018

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This paper compares the annual performance of Integrated Solar Combined Cycles (ISCCs) using different solar concentration technologies: parabolic trough collectors (PTC), linear Fresnel reflectors (LFR) and central tower receiver (CT). Each solar technology (i.e. PTC, LFR and CT) is proposed to integrate solar energy into the combined cycle in two different ways. The first one is based on the use of solar energy to evaporate water of the steam cycle by means of direct steam generation (DSG), increasing the steam production of the high pressure level of the steam generator. The other one is based on the use of solar energy to preheat the pressurized air at the exit of the gas turbine compressor before it is introduced in the combustion chamber, reducing the fuel consumption. Results show that ISCC with DSG increases the yearly production while solar air heating reduces it due to the incremental pressure drop. However, air heating allows significantly higher solar-to-electricity efficiencies and lower heat rates. Regarding the solar technologies, PTC provides the best thermal results.

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“…Direct steam generation (DSG) from water eliminates the need for components like heat transfer fluid, heat exchangers, is non-toxic, have simpler overall plant configuration, allows the solar field to operate at higher temperatures, resulting in higher power cycle efficiencies and lower fluid pumping energies [96,97] Though, DSG still is one of the most promising opportunities for future cost reductions in high concentration solar collectors, it suffers from a number of operational issues such as two-phase flow, higher control requirement, difficult and expensive storage (mostly sensible heat storage), higher temperature gradients, high operating pressures resulting into frequent leakages etc. Compact Linear Fresnel Reflectors (CLFR) were designed to be using only water as its heat transfer fluid in direct steam generation and the trend of DSG is slowly being experimented in Parabolic Solar Collectors as well as in some of the Solar Towers [98].…”

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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Comparison of Heat Transfer Fluid and Direct Steam Generation technologies for Integrated Solar Combined Cycles

Cited by 105 publications

References 26 publications

Integrated Solar Combined Cycle Power Plants: Paving the way for thermal solar

Integrated Solar Combined Cycle Power Plants: Paving the way for thermal solar

Comparison of Different Technologies for Integrated Solar Combined Cycles: Analysis of Concentrating Technology and Solar Integration

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

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