Analysis of a latent thermocline storage system with encapsulated phase change materials for concentrating solar power

Nithyanandam, Karthik; Pitchumani, R.; Mathur, Anoop

doi:10.1016/j.apenergy.2013.08.053

Cited by 132 publications

(49 citation statements)

References 23 publications

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“…Subsequent charge and discharge processes are carried out until the difference between the total utilizations is less than 0.5% in the subsequent cycles (periodic state) [37]. It is noticed that the difference of total utilization of the system between cycle 2 and 3 is 0.16%, and the total charge and discharge times are not varied.…”

Section: Cyclic Charging and Dischargingmentioning

confidence: 98%

“…Since the power block cycle process depends on the HTF temperature, it requires the termination of discharge process when the HTF exit temperature reaches minimum cut-off temperature, T d , [37]. Similarly the maximum cut-off temperature, T c , assigned for the HTF exit temperature during charge mode due to the receiver temperature limitations [37]. The minimum and maximum cut-off temperatures are determined by the application of interest, in this investigation T c and T d are assumed to be 301.8 and 311.8 C respectively.…”

Section: Cyclic Charging and Dischargingmentioning

confidence: 99%

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Numerical analysis of charging and discharging performance of a thermal energy storage system with encapsulated phase change material

Bellan

González-Aguilar

Romero

et al. 2014

Applied Thermal Engineering

101

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Section: Cyclic Charging and Dischargingmentioning

confidence: 98%

Section: Cyclic Charging and Dischargingmentioning

confidence: 99%

Numerical analysis of charging and discharging performance of a thermal energy storage system with encapsulated phase change material

Bellan

González-Aguilar

Romero

et al. 2014

Applied Thermal Engineering

101

View full text Add to dashboard Cite

“…Other authors studied the effect of several parameters on TES performance for one charge/discharge cycle with molten salt as HTF [25]. Recently, the performance of a packed bed storage system with encapsulated phase change material was investigated using molten salt for CSP applications [26], synthetic oil [27] or gas as HTF [28]. A new TES configuration for CSP applications based on the combination of sensible and latent heat storage obtained by adding a relatively small amount of encapsulated PCM at the top of a packed bed was proposed to stabilize outflow temperature during the discharging phase [29].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research Activity on a Packed Bed TES System

et al. 2016

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This paper presents the results of experimental and numerical research activities on a packed bed sensible thermal energy storage (TES) system. The TES consists of a cylindrical steel tank filled with small alumina beads and crossed by air used as the heat transfer fluid. Experimental tests were carried out while varying some operating parameters such as the mass flow rate, the inlet-outlet temperature thresholds and the aspect ratio (length over diameter). Numerical simulations were carried out using a one-dimensional model, specifically developed in the Matlab-Simulink environment and a 2D axisymmetric model based on the ANSYS-Fluent platform. Both models are based on a two-equation transient approach to calculate fluid and solid phase temperatures. Thermodynamic properties were considered to be temperature-dependent and, in the Computational Fluid Dynamics (CFD) model, variable porosity of the bed in the radial direction, thermal losses and the effective conductivity of the alumina beads were also considered. The simulation results of both models were compared to the experimental ones, showing good agreement. The one-dimensional model has the advantage of predicting the axial temperature distribution with a very low computational cost, but it does not allow calculation of the correct energy stored when the temperature distribution is strongly influenced by the wall. To overcome this problem a 2D CFD model was used in this work.

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“…Suitable phase change materials for high temperature processes have been investigated since the LTES system with PCM has been identified as a promising low-cost system for CSP plants; molten salt has been found as promising material to be used as the PCM for high temperature storage systems, range from 100°C to above 600°C. Thus, numerical models have been developed to investigate the thermal performance characteristics of the LTES system with molten salt as the PCM [2,11,[13][14][15][16][17]. The main aim of this investigation is to numerically analyze the charging behavior of latent heat storage system with encapsulated phase change material in spherical capsules.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of latent heat storage system with encapsulated phase change material in spherical capsules

Bellan

Cordiviola

Barberis

et al. 2017

Renew. Energy Environ. Sustain.

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Abstract. Solar energy has been considered as one of the promising solutions to replace the fossil fuels. To generate electricity beyond normal daylight hours, thermal energy storage systems (TES) play a vital role in concentrated solar power (CSP) plants. Thus, a significant focus has been given on the improvement of TES systems from the past few decades. In this study, a numerical model is developed to obtain the detailed heat transfer characteristics of lab-scale latent thermal energy storage system, which consists of molten salt encapsulated spherical capsules and air. The melting process and the corresponding temperature and velocity distributions in every capsule of the system are predicted. The enthalpy-porosity approach is used to model the phase change region. The model is validated with the reported experimental results. Influence of initial condition on the thermal performance of the TES system is predicted.

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Analysis of a latent thermocline storage system with encapsulated phase change materials for concentrating solar power

Cited by 132 publications

References 23 publications

Numerical analysis of charging and discharging performance of a thermal energy storage system with encapsulated phase change material

Numerical analysis of charging and discharging performance of a thermal energy storage system with encapsulated phase change material

Experimental and Numerical Research Activity on a Packed Bed TES System

Numerical analysis of latent heat storage system with encapsulated phase change material in spherical capsules

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