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Annual Review of Heat Transfer, Vol. 15, p.131-177 https://doi.org/10.1615/AnnualRevHeatTransfer.2012004651 Abstract Renewable energy generation is inherently variable. Solar energy shows seasonally (summer- winter), daily (day-night) and hourly (clouds) variations. TES systems correct the mismatch between the solar supply and the demand of thermal energy. Hence, TES is a key technology for solar thermal energy utilization with growing present and future importance. This chapter gives a broad overview of different TES materials and technologies. The text follows the classification commonly adopted in the academic literature. The three major TES types are sensible (Section 2), latent (Section 3) and thermochemical (Section 4). The chapter focuses on high temperature applications in the area of concentrated solar power (CSP) generation. Nomenclature a Thermal diffusivity b Thermal effusivity CF Cylinder factor cp Specific heat capacity Δhm Heat of melting [m2/s] a = λ/(ρcp) [J/(m2Ks1/2)] [1] [J/(kgK)] R = 8.314472 J/(mol·K) St = cp(Tm-Tw)/L λ Thermal conductivity [W/(mK)] ρ Density [kg/m3] Δhr Heat of reaction l Distance L Latent heat of the PCM m Mass M Molar mass q Heat per mass qmol Molar Heat Q Heat R Molar gas constant St Stefan number [1] t Time [s] T Temperature [K] ΔT Temperature difference [K] V Volume [m3] ΔV Volume change on melting [m3] [J/kg] [J/kg] [m] [J/kg] [kg] [kg/mol] [J/kg] [J/mol] [J]PDF Image | Annual Review of Heat Transfer
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