Basic engineering of a high performance molten salt tower receiver system

Frantz, Cathy; Binder, Matthias; Busch, K.; Ebert, Miriam; Heinrich, Andreas; Kaczmarkiewicz, Nadine; Schlögl, Bärbel; Kunze, Tobias; Schuhbauer, Christian; Steka, Markus; Schwager, Christian; Spiegel, M.; Boura, Cristiano Teixeira; Bauer, Thomas; Bonk, Alexander; Eisen, Stefan; Funck, B.

doi:10.1063/5.0085895

Cited by 4 publications

(7 citation statements)

References 13 publications

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“…A steam generator is not a part of the loop, therefore an air cooler is installed to dissipate the thermal energy absorbed by the receiver. More Information about the loop can be found in Frantz et al [12,14]. To enable the operation of the solar preheating, the temperature of the receiver backside 𝑇𝑇 𝑎𝑎𝑎𝑎𝑠𝑠,𝑎𝑎𝑎𝑎𝑏𝑏𝑏𝑏 is measured by 48 Type K class 1 thermocouples that are uniformly distributed over the absorber height (FIG 2) and the width of the receiver.…”

Section: Methodsmentioning

confidence: 99%

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Commissioning of a Preheat Strategy of a Molten Salt Test Receiver

Reisch,

Frantz,

Sibum

et al. 2024

SolarPACES Conf Proc

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Solar power tower plants that are operated with molten salt offer the advantage that the molten salt can be used as a heat transfer medium as well as storage medium. Consequently, solar energy can be stored easily and efficiently in only one loop without transformation losses. Furthermore, by using large-scale storage facilities, almost a 24/7 base load operation is possible. Since the molten salt begin to crystallize at temperature of 238 °C, the absorber tube must be preheated before the plants’ operation can begin. During the preheating a subset of heliostats will be aimed on the receiver surface to ensure a solar flux density that leads to tube temperatures above the solar salt crystallization point. Since the absorber tubes are empty during the preheating, there is a risk of high temperature gradients and transients and thus high thermal stresses that may lead to fatigue damage. To prevent this, a preheating strategy for a molten salt test receiver was developed and tested, taking into account ambient conditions and time. The present work shows the results of the commissioning of the developed preheating strategy and discusses its potential for improvement.

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Section: Methodsmentioning

confidence: 99%

“…Apart from the absorber tubes, the receiver is covered with insulation. The engineering of the receiver allows a mass flow range between 1.3 to 12.8 kg/s in serpentine flow and allows the operation at incident solar flux density up to 1000 kW/m² [12].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Commissioning of a Preheat Strategy of a Molten Salt Test Receiver

Reisch,

Frantz,

Sibum

et al. 2024

SolarPACES Conf Proc

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“…At the outer boundary of the tube domain, both radiative heat exchange between tube segment and surroundings with = 0.87 (Ho et al, 2013) and convective thermal losses with a reference heat transfer coefficient of 30 W/m 2 K accounting for considerable wind are considered (cf. Siebers and Kraabel (1984) 11 Compare also Frantz et al (2020), where, in the context of a creep-fatigue evaluation for a prototypic molten salt high temperature receiver at design stage, following ASME BPVC-III-5 as well, a nonlinear Chaboche model is combined with a Norton-Bailey power law approach for the absorber tubes made of austenitic alloy DMV 310N.…”

Section: Methodsmentioning

confidence: 99%

“…Stress relaxation curves are derived from isochronous stress-strain curves at respective modified strain ranges ∆ε eq , resulting creep-rupture times t c are determined both from design and nominal stress-to-rupture curves based upon a Larson-Miller correlation for 0.95-percentile. For design by inelastic analysis 23 (compare Fork et al (2012); Frantz et al (2020)), representative strain ranges ∆ε eq and stress relaxation profiles are extracted from the inelastic mechanical model (see above, Sec. 2.2.1).…”

Section: Rodríguezmentioning

confidence: 99%

“…1, however, -ultimately amounting to real-time, condition-based operational and maintenance strategy optimization -is basically restricted by respective model complexity and available computational resources 26 . Thus, solely relying on conventional modeling and reduction methods, a trade-off between accuracy of thermomechanical modeling on the one hand and temporal resolution on the other hand is inevitable.As consequence, one objective to be demonstrated in upcoming functional testing of a bottom-up approach for local damage accumulation and monitoring of service life consumption at a pilot scale test facility (cf Frantz et al (2020)…”

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confidence: 99%

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Monitoring of service life consumption for tubular solar receivers: Review of contemporary thermomechanical and damage modeling approaches

Hering

Binder²,

Schwarzbözl

et al. 2021

Solar Energy

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Experimental Methods for Measuring the Efficiency of a Molten Salt Central Receiver

Fernández-Torrijos,

Frantz,

Stengler

et al. 2024

SolarPACES Conf Proc

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In this work, two different methods for measuring the efficiency of central receivers are analyzed by the case of the High Performance Molten Salt II Project (HPMS-II): the continuous power-on method, and the semi-analytical method. The main difference between the two methods is the procedure to calculate the thermal losses of the receiver: on the one hand, the continuous power-on method calculates the thermal losses from the measurement of the absorbed power by the molten salt for different measured incident powers on the receiver. Here, it is assumed that the thermal losses are independent of the incident power if the molten salt temperature is kept constant. On the other hand, the semi-analytical method calculates the thermal losses as the sum of convective and radiative losses, calculated directly from the Newton and Stefan-Boltzmann equations by measuring the temperature of the tube surface, the ambient temperature, and the wind speed. Therefore, the calculation of the thermal losses is independent from one method to another. The procedure of applying these methods during the experimental test campaign of the HPMS-II receiver is detailed in this paper. Additionally, an uncertainty analysis of both methods is conducted to determine the uncertainty expected for the receiver efficiency measurements.

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Basic engineering of a high performance molten salt tower receiver system

Cited by 4 publications

References 13 publications

Commissioning of a Preheat Strategy of a Molten Salt Test Receiver

Commissioning of a Preheat Strategy of a Molten Salt Test Receiver

Monitoring of service life consumption for tubular solar receivers: Review of contemporary thermomechanical and damage modeling approaches

Experimental Methods for Measuring the Efficiency of a Molten Salt Central Receiver

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