Thermal analysis of a Phase Change Material for a Solar Organic Rankine Cycle

Iasiello, Marcello; Braimakis, Konstantinos; Andreozzi, Assunta; Karellas, Sotiriοs

doi:10.1088/1742-6596/923/1/012042

Cited by 12 publications

(9 citation statements)

References 28 publications

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“…In Figure 3 a comparison between the 1D finite-difference model developed by Iasiello et al [34] and the 2D model without natural convection of the present study is shown in terms of temperature profiles for the four boundary conditions. From the figure, the good agreement for all the cases can be confirmed.…”

Section: Resultsmentioning

confidence: 85%

“…Results comparing the models with and without natural convection included will be presented in terms of temperature profiles and cumulated energy. Cumulated energy is obtained by performing the internal energy integration over time for two consecutive times as in [34], where the internal energy is proportional to the temperature difference via the effective specific heat capacity defined in Equation (8).…”

Section: Resultsmentioning

confidence: 99%

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Numerical Investigation of a Phase Change Material Including Natural Convection Effects

2021

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Nowadays, Organic Rankine Cycle (ORC) is one of the most promising technologies analyzed for electrical power generation from low-temperature heat such as renewable energy sources (RES), especially solar energy. Because of the solar source variation throughout the day, additional Thermal Energy Storage (TES) systems can be employed to store the energy surplus saved during the daytime, in order to use it at nighttime or when meteorological conditions are adverse. In this context, latent heat stored in phase-change transition by Phase Change Materials (PCM) allows them to stock larger amounts of energy because of the larger latent energy values as compared to the specific heat capacity. In this study, a thermal analysis of a square PCM for a solar ORC is carried out, considering four different boundary conditions that refer to different situations. Furthermore, differences in including or not natural convection effects in the model are shown. Governing equations for the PCM are written with references to the heat capacity method and solved with a finite element scheme. Experimental data from literature are employed to simulate the solar source using a time-variable temperature boundary condition. Results are presented in terms of temperature profiles, stored energy, velocity fields and melting fraction, showing that natural convection effects are remarkable on the temperature values and consequently on the stored energy achieved.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Numerical Investigation of a Phase Change Material Including Natural Convection Effects

2021

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“…The Net Present Value (NPV) of the system was compared for different types of storage units and it was found that applying pure oil results in the lowest NPV for all the considered collecting areas. According to the findings of this study, it can be determined that system performance in terms of technical and financial criteria is under the influence of storage material and type since the stored heat in the thermal storage unit is dependent on the properties of the applied material, such as the latent and sensible heat capacities, and thermal conductivity of the material (Iasiello et al, 2017). In this regard, it would be beneficial to assess different storage types and materials to find the most appropriate choice.…”

Section: Thermal Storage Units In Solar Orcsmentioning

confidence: 99%

Applications of Thermal Energy Storage in Solar Organic Rankine Cycles: A Comprehensive Review

et al. 2021

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Organic Rankine Cycles (ORCs) are promising approaches for generating power from medium or low temperature heat sources. In this regard, ORCs can be used to indirectly produce power from solar energy. Due to intermittent nature of solar energy, storage unit should be coupled with solar ORCs to improve the output power and operating hours. In this article, studies on solar ORCs integrated with various types of storage units were reviewed; the main findings of such studies were extracted and provided. Based on the findings, several factors such as the temperature and pressure at the inlet of the turbine, as well as the operating condition affect the performance of solar ORCs with thermal storage unit just like the conventional ORCs. In addition, the optimum size of the storage unit in the solar ORCs was found to depend on the operating condition. From the financial perspective, it can be noted that the storage unit affects the corresponding indicators. Moreover, the improvement rate in the ORCs by applying storage units could be affected by the configuration of the system.

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“…The other PCMs used in the solar ORC were erythritol, xylitol, D-mannitol and magnesium chloride hexahydrate (MgCL 2 6H 2 O). When compared to MgCL 2 6H 2 O, erythritol can store 30% more energy per unit volume as a PCM in solar ORC [51]. However, these studies have not considered the design of heat exchangers such as embedded and packedbed heat exchangers that can use encapsulated PCMs for effective heat transfer performance.…”

Section: Pcms For Storage Of Solar Energymentioning

confidence: 99%

Recent advances in phase change materials for thermal energy storage-a review

Venkateswarlu¹,

Konijeti

2021

J Braz. Soc. Mech. Sci. Eng.

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The research on phase change materials (PCMs) for thermal energy storage systems has been gaining momentum in a quest to identify better materials with low-cost, ease of availability, improved thermal and chemical stabilities and eco-friendly nature. The present article comprehensively reviews the novel PCMs and their synthesis and characterization techniques for improving the properties and long-term storage capabilities. They include eco-friendly PCMs based on wood and tree fruit oils, microPCMs, nanoconfinement of organic PCMs, metal organic PCMs, bio-based PCMs, metal organic framework (MOF) PCMs and form-stable PCMs with gelators. The novel approaches such as cryogenically treated microencapsulated PCMs and treating them with photo-switching dopants to improve the properties are also presented. This review provides the useful insights about recent advances in the field of PCMs. The phase change slurries can effectively improve the thermal performance of photovoltaic/thermal systems. The thermal conductivity of PCMs can be enhanced significantly by PCM slurries, MOFs, exfoliated graphite nanoplatelets and composite PCMs. Optical control of PCMs by doping them with azobenzene dopants is found to be the most promising technique to improve the thermal stability and long-term storage capacity of PCMs. Cyclic cryogenic treatment by liquid nitrogen followed by heat treatment of PCMs can improve the latent heat, thermal and chemical stabilities significantly. The insightful information presented in this article can serve as an important tool for the researchers in the field of PCMs research to further innovate the technology in different applications such as thermal management of buildings, solar energy storage and cryogenic storage etc.

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Thermal analysis of a Phase Change Material for a Solar Organic Rankine Cycle

Cited by 12 publications

References 28 publications

Numerical Investigation of a Phase Change Material Including Natural Convection Effects

Numerical Investigation of a Phase Change Material Including Natural Convection Effects

Applications of Thermal Energy Storage in Solar Organic Rankine Cycles: A Comprehensive Review

Recent advances in phase change materials for thermal energy storage-a review

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