Abstract:The recovery and storage of process heat in industrial applications are some of the key factors to improve the sustainability and reliability of high temperature applications. In this sense, one of the main drawbacks is focused on the selection of proper thermal energy storage (TES) materials. This paper performs a full characterization of four phase change storage materials (PCM), KOH, LiOH, NaNO3 and KNO3, which are proposed for storage applications between 270 and 500 °C, according to the results obtained t… Show more
“…Nonetheless, an average enthalpy of 1103 ± 14 kJ/kg and 1115 ± 15 kJ/kg are observed for melting and solidification respectively, completely in line with the values reported by Gurvich et al in Ref. [ 25 ]. Fig.…”
Section: Resultssupporting
confidence: 91%
“…[ 24 ] and in Gurvich et al in Ref. [ 25 ] using DSC standard mode. This discrepancy is also observed when compared with values found in earlier report by Tye et al [ 21 ], where the standard drop calorimetry method was employed ( Table 1 ).…”
“…Nonetheless, an average enthalpy of 1103 ± 14 kJ/kg and 1115 ± 15 kJ/kg are observed for melting and solidification respectively, completely in line with the values reported by Gurvich et al in Ref. [ 25 ]. Fig.…”
Section: Resultssupporting
confidence: 91%
“…[ 24 ] and in Gurvich et al in Ref. [ 25 ] using DSC standard mode. This discrepancy is also observed when compared with values found in earlier report by Tye et al [ 21 ], where the standard drop calorimetry method was employed ( Table 1 ).…”
“…A case study with different fins on the bottom of the absorber plate was considered to improve the thermal performance in single-phase and double-phase solar thermal collectors. Moreover, researchers have studied how the fin's shape and design affect and handle heat dissipation [25,26]. In a different study [27], three types of molten salts were used as phase change materials (PCMs) in a computational study of how a three-stage cascaded latent heat thermal energy storage (LHTES) unit is filled and emptied.…”
Highly concentrated triple-junction solar cells (HCTJSCs) are cells that have diverse applications for power generation. Their electrical efficiency is almost 45%, which may be increased to 50% by the end of the year 2030. Despite their overwhelming ability to generate power, their efficiency is lower when utilized in a concentrated manner, which introduces a high-temperature surge, leading to a sudden drop in output power. In this study, the efficiency of a 10 mm × 10 mm multijunction solar cell (MJSC) was increased to almost 42% under the climatic conditions in Lahore, Pakistan. Active cooling was selected, where SiO2–water- and Al2O3–water-based nanofluids with varying volume fractions, ranging from 5% to 15% by volume, were used with a 0.001 kg/s mass flow rate. In addition, two- and three-layer microchannel heat sinks (MCHSs) with squared microchannels were designed to perform thermal management. Regarding the concentration ratio, 1500 suns were considered for 15 August at noon, with 805 W/m2 and 110 W/m2 direct and indirect radiation, respectively. A complete model including a triple-junction solar cell and allied assemblies was modeled in Solidworks software, followed by temperature profile generation in steady-state thermal analyses (SSTA). Thereafter, a coupling of SSTA and Ansys Fluent was made, in combination with the thermal management of the entire model, where the temperature of the TJSC was found to be 991 °C without active cooling, resulting in a decrease in electrical output. At 0.001 kg/s, the optimum average surface temperature (44.5 °C), electrical efficiency (41.97%), and temperature uniformity (16.47 °C) were achieved in the of MJSC with SiO2–water nanofluid with three layers of MCHS at a 15% volume fraction. Furthermore, the average outlet temperature of the Al2O3–water nanofluid at all volume fractions was high, between 29.53 °C and 31.83 °C, using the two-layer configuration. For the three-layer arrangement, the input and output temperatures of the working fluid were found to be the same at 25 °C.
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