Phase Change Material Selection for Thermal Energy Storage at High Temperature Range between 210 °C and 270 °C

Maldonado, José Miguel; Fullana, Margalida; Martín, Marc; Solé, Aran; Fernández, Ángel G.; Gracia, Álvaro de; Cabeza, Luisa F.

doi:10.3390/en11040861

Cited by 39 publications

(16 citation statements)

References 23 publications

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“…The PCM storage tank, investigated by Northumbria University [24] and the University of Lleida [25], was made of a nitrate solar salt kNO 3 (40 wt%)/NaNO 3 (54 wt%), which has a melting temperature in the range 216-223 • C [26], a high heat of fusion, but a low thermal conductivity. The TES was designed to store about 100 kWh of latent thermal energy from the solar field in order to guarantee 4 h of ORC unit operation during night time.…”

Section: Pcm Tes Orcmentioning

confidence: 99%

Multi-Country Analysis on Energy Savings in Buildings by Means of a Micro-Solar Organic Rankine Cycle System: A Simulation Study

et al. 2018

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In this paper, the smart management of buildings energy use by means of an innovative renewable micro-cogeneration system is investigated. The system consists of a concentrated linear Fresnel reflectors solar field coupled with a phase change material thermal energy storage tank and a 2 kWe/18 kWth organic Rankine cycle (ORC) system. The microsolar ORC was designed to supply both electricity and thermal energy demand to residential dwellings to reduce their primary energy use. In this analysis, the achievable energy and operational cost savings through the proposed plant with respect to traditional technologies (i.e., condensing boilers and electricity grid) were assessed by means of simulations. The influence of the climate and latitude of the installation was taken into account to assess the performance and the potential of such system across Europe and specifically in Spain, Italy, France, Germany, U.K., and Sweden. Results show that the proposed plant can satisfy about 80% of the overall energy demand of a 100 m2 dwelling in southern Europe, while the energy demand coverage drops to 34% in the worst scenario in northern Europe. The corresponding operational cost savings amount to 87% for a dwelling in the south and at 33% for one in the north.

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Section: Pcm Tes Orcmentioning

confidence: 99%

Multi-Country Analysis on Energy Savings in Buildings by Means of a Micro-Solar Organic Rankine Cycle System: A Simulation Study

et al. 2018

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“…Nowadays fossil fuel energy resources are severely reduced, which is causing an increasing demand for the development and application of suitable alternative energies, especially solar energy, which is a renewable energy [1]. Concentrated solar thermal power (CSP) is one of the main technologies for solar energy utilization [2][3][4][5], while the suitability of a solar collector should be chosen according to the testing conditions specified in the existing standards [6]. A CSP system always uses heat transfer fluid (HTF) to send the intense heat to a thermal power plant which is able to provide power at night-time with the amount of stored thermal energy.…”

Section: Introductionmentioning

confidence: 99%

Rheological Characteristics of Molten Salt Seeded with Al2O3 Nanopowder and Graphene for Concentrated Solar Power

et al. 2019

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HITEC salt (NaNO2-NaO3-KNO3) and solar salt (NaO3-KNO3) are typical molten salts used in concentrated solar power. Adding nanoparticles is an effective method to improve the thermo-physical properties of pure salt. It is indispensable to experimentally study the rheological behaviours of salt seeded with nanoparticles, which can increase the specific heat capacity of pure salt. In this work, the viscosities of HITEC salt were measured with different shear rates in the temperature range of 200 °C to 450 °C firstly, while those of solar salt were measured in the temperature range of 250 °C to 500 °C. The experimental data showed reasonable agreement with the literature correlations, which verify the Newtonian behaviours of pure salts. The evolutions of the viscosities of nanocomposites in the same temperature range were measured and analysed, where the nanocomposites were synthesized with 1 wt.% or 2 wt.% Al2O3 nanopowder and graphene, respectively. Results showed that the addition of Al2O3 nanopowder had relatively little effect on viscosity, and the variations were about −35.4%~8.1% for the HITEC salt nanocomposites and −9.2%~68.1% for the solar salt nanocomposites. While graphene would apparently increase the viscosities of HITEC salt and solar salt, HITEC salt with the addition of graphene showed slight non-Newtonian fluid behaviour.

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“…For the different enhancement methods, the comparison of models with experiments are common, often with improper assumptions as in [35], where the authors consider conduction as the sole heat-transfer mechanism. The selection of the suitable PCM can be challenging, as Gasia et al is demonstrating in [36] or Maldonaldo et al for a higher temperature range between 210 • C and 270 • C [37]. The influence of the inner heat transfer from the HTF to the tube can also be crucial, as presented in [38].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer in Latent High-Temperature Thermal Energy Storage Systems—Experimental Investigation

2019

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Thermal energy storage systems with phase-change materials promise a high energy density for applications where heat is to be stored in a narrow temperature range. The advantage of higher capacities comes along with some challenges in terms of behavior prediction. The heat transfer into such a storage is highly transient and depends on the phase state, which is either liquid or solid in the present investigation. The aim is to quantify the heat transfer into the storage and to compare two different fin geometries. The novel geometry is supposed to accelerate the melting process. For this purpose, a single tube test rig was designed, built, and equipped with aluminum fins. The phase-change material temperature as well as the heat-transfer fluid temperature at the inlet and outlet were measured for charging and discharging cycles. Sodium nitrate is used as phase-change material, and the storage is operated ±30 ∘ C around the melting point of sodium nitrate, which is 306 ∘ C . An enthalpy function for sodium nitrate is proposed and the methodology for determining the apparent heat-transfer rate is provided. The phase-change material temperature trends are shown and analyzed; different melting in radial and axial directions and in the individual geometry sections occurs. With the enthalpy function for sodium nitrate, the energy balance is determined over the melting range. Values for the apparent heat-transfer coefficient are derived, which allow capacity and power estimations for industrial-scale latent heat thermal energy systems.

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Phase Change Material Selection for Thermal Energy Storage at High Temperature Range between 210 °C and 270 °C

Cited by 39 publications

References 23 publications

Multi-Country Analysis on Energy Savings in Buildings by Means of a Micro-Solar Organic Rankine Cycle System: A Simulation Study

Multi-Country Analysis on Energy Savings in Buildings by Means of a Micro-Solar Organic Rankine Cycle System: A Simulation Study

Rheological Characteristics of Molten Salt Seeded with Al2O3 Nanopowder and Graphene for Concentrated Solar Power

Heat Transfer in Latent High-Temperature Thermal Energy Storage Systems—Experimental Investigation

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