Comparison of simplified heat transfer models and CFD simulations for molten salt external receiver

Rodríguez-Sánchez, M.R.; Marugán-Cruz, C.; Acosta-Iborra, A.

doi:10.1016/j.applthermaleng.2014.08.072

Cited by 93 publications

(43 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two different models for power tower receiver and extracted the effect of varying mass flow rate and wind velocity considering the circumferential temperature variations has also been presented. 37 It was found that major heat loses in the receiver are due to radiation while increase in mass flow rate can improve receiver efficiency. Since the receiver designs are simplified and CFD simulation requires huge computational cost to simulate a receiver, there was a dramatic decrease in computational time mandatory for receiver design.…”

Section: Literature Reviewmentioning

confidence: 99%

Simulation of hybrid two‐tank storage concentrated solar plant using supercritical carbon dioxide in TRNSYS

et al. 2020

View full text Add to dashboard Cite

To meet heating demand without global warming is a huge target for the energy community these days. To attain this challenge, solar energy harvesting to meet domestic hot water demand is a promising solution. Carbon dioxide (CO 2) is becoming ever more significant as heat transporting fluid. Simulationbased efficiency assessment models are requisite for analogous advances. This research presents a dynamic simulation model of high temperature concentrated solar plant using directly heated molten salt to indirectly power a supercritical CO 2 Brayton cycle. Target of the study is to achieve 1 MW generation and simulation work is performed in TRNSYS computer software. The operating conditions for the plant cycle and efficiency for indirectly heated CO 2 recompression Brayton cycle are also calculated with the help of engineering equation solver. The system is divided into three major loops: solar thermal heat collection, power generation, and heat recovery. Results have shown overall cycle efficiency up to 40%. During the day hours from 4688 to 4697, receiver provides a constant outlet temperature of 700 C with a fluid inlet flow rate of 15 kg/s and mediating fluid after exchanging heat enters the receiver's end at 524 C. An optimized value of 2.9 is selected as pressure ratio to meet supercritical conditions at the compressor inlet. Output power generated is 3.035 MW with turbine efficiency is 92%. The power calculated for main compressor and recompressor are 0.68 and 0.228 MW, respectively.

show abstract

Section: Literature Reviewmentioning

confidence: 99%

Simulation of hybrid two‐tank storage concentrated solar plant using supercritical carbon dioxide in TRNSYS

et al. 2020

View full text Add to dashboard Cite

show abstract

“…At this time, there is an increase of nearly 20 bars in the pressure drop. [50] Receiver functioning modes and tube wall Both the basic frameworks are able to determine effect of salt, heat fluxes, and the temperature of tube wall with a 6% less variation than CFD simulations. The findings indicate that constant temperature of tube wall leads to less wall temperature, miscalculating film temperature, salt decomposition, and thermal stress.…”

Section: Authorsmentioning

confidence: 99%

Solar Tower Power: The Impact of External Receiver on Optimal Performance and Energy Storage

Shatnawi,

Lim,

Ismail

2019

IJEAT

View full text Add to dashboard Cite

An external receiver was seen as a major component of the Solar Tower Power (STP) plant. This generated stable power from concentrated sunlight. However, the flux distribution on its surface was an issue related to the external receiver that could affect the performance and energy storage in STP. The heat flux increased during long-term use, failure reduction, receiver efficiency and performance. The main advantage of the STP structure was its substantial heat storage capacity which allowed the system to generate stable and continuous electric power. In this study, the researchers reviewed existing literature to investigate the effect of the STP external receiver on the optimum energy storage and performance of the STP; especially regarding the solar flux distribution and efficiency. The researchers aim to improve the external receiver’s optimal performance without affecting the incident heat fluxes. The literature review indicates that ideal receiver conditions lead to solar energy flux distribution optimal performance. Therefore, system optimisation was necessary to satisfy all limitations; like loss occurring due to heliostat field, solar flux flow patterns, external tubular receiver designs, and Heat Transfer Fluid (HTF) selection. These limitations, along with factors affecting these limitations, are reviewed in this study.

show abstract

“…On the basis of the concepts of AFD and aiming factor, as presented in previous section, a complete methodology to aim all the heliostats in a field was developed. This aiming strategy couples the previously presented optical model [5] and a thermal model for cylindrical receivers using molten salt as heat transfer fluid [22,23]. Limitations by corrosion (e.g.…”

Section: Aiming Strategy For Molten Salt Receivers: Allowable Flux Dementioning

confidence: 99%

Heliostat field aiming strategies for solar central receivers

Sánchez-González¹

2019

Opt. Pura Apl.

View full text Add to dashboard Cite

This thesis work deals with the development and validation of four optical models for Solar Power Tower technology. The first model accurately computes the solar flux distribution incident on any central receiver reflected by a single heliostat; the novelty relies on the oblique projection of the receiver mesh onto the image plane where an analytic convolution function is evaluated. The second model determines the canting errors in the facets of real heliostats using a deterministic optimization algorithm that minimizes the difference between computed flux maps and experimental images captured on a Lambertian target. The third model extends the basic model to complete fields of heliostats where a symmetric aiming strategy is developed; just a single parameter, novel k factor, is needed to aim all the heliostats. The last aiming model maximizes the output in molten salt receivers while meeting the corrosion and thermal stress constraints; which are translated into allowable flux densities.

show abstract

Comparison of simplified heat transfer models and CFD simulations for molten salt external receiver

Cited by 93 publications

References 16 publications

Simulation of hybrid two‐tank storage concentrated solar plant using supercritical carbon dioxide in TRNSYS

Simulation of hybrid two‐tank storage concentrated solar plant using supercritical carbon dioxide in TRNSYS

Solar Tower Power: The Impact of External Receiver on Optimal Performance and Energy Storage

Heliostat field aiming strategies for solar central receivers

Contact Info

Product

Resources

About