The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/ente.202200118.

Oil-based thermal energy storage system with solar collector has become populous due to its simple design and characteristics. Majorly, the solar-based thermal storage systems operate between 70 C and 150 C temperature, with one disadvantage of inability to store energy during off-peak hours. The stored energy in thermal storage can be used for the different domestic applications, such as water heating, cooking of food, boiling, etc. An effort has been made to investigate the oil-based thermal energy storage system with the potential design to achieve the higher temperature range of above 200 C. These systems can be used for domestic applications such as cooking. The integrated thermal storage system has been developed using nitrate salt as phase changing material to store the latent heat. The phase change material is filled in the cavity of the oil-based thermal storage. The aluminum oxide (Al 2 O 3 ) and soybean oil nanofluid in a thermo-syphon is used as a heat transfer fluid to store and transfer the sensible heat. Parabolic trough solar collector is coupled with thermal storage system. The maximum temperature of the phase change material, during the experiment, in thermal storage system was achieved up to 220 C, which is the melting point of phase change material. The mathematical model for the heat transfer analysis is also developed and the results were validated with the experimental results. The various heat transfer analysis using regression analysis is discussed.

Metal and phase change material (PCM) is used for thermal storage system.Aluminum as a metal and erythritol as the PCM is a better option for the thermal storage. This thermal storage is charging with the help of solar energy through a solar collector. Parabolic trough solar collector is used to collect the solar energy. Evacuated tube was used to absorb solar radiation and soybean oil-based nanofluid containing Al 2 O 3 nanoparticles at volume concentration of 0.1% is filled in tube to transfer heat from absorber tube to thermal storage. Nanofluid was prepared with the help of ultrasonication. The heat transfer from the absorber to thermal storage through self-circulation unit. Experimentation is carried out with and without nanofluid. Nanofluid of soybean oil and Al 2 O 3 is enhanced the performance of solar collector. The thermal storage and absorber temperature is reached upto the 153 C and 178 C while using nanofluid. The discharging of PCM is carried out through experimentation.The PCM is filled in thermal storage, which changes its phase and stores the energy which can be used at night when solar energy is not available. K E Y W O R D Saluminum-based thermal storage, heat transfer fluid, nanofluid, phase change materials, solar collector

AbstractIn the recent years, a lot of research has been carried out in the field of nanofluid based solar collector, leading towards the enhancement of working efficiency even at low atmospheric temperature or at low sunlight levels regions of the world. The present review pertains to the research progress related to the performance execution of solar collector using nanofluid. It is observed that the thermal energy storage system (TES), using solar collector, is a useful device for storing sensible and latent heat in a unit volume. Nanofluid plays an important role in various thermal applications such as heat exchanger, solar power generation, automotive industries, electronic cooling system, etc. The nanoparticles find the use in various industrial applications because of its properties, such as thermal, mechanical, optical and electrical. Most of the investigations carried out earlier on the applications of nanofluid in solar energy are related to their uses in the solar collector and thermal storage system. The parabolic solar collector using nanofluid is still a challenge. This article presents an exhaustive review of thermal storage system using nanofluid based solar collector and a scope of using nanofluid based solar collector for performance enhancement.

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