Experimental study on thermophysical parameters of a solar assisted cascaded latent heat thermal energy storage (CLHTES) system

Man Fan, Hanxiao Suo, Hua Yang, Xuemei Zhang, Xiaofei Li, Leihong Guo and Xiangfei Kong

Energy, 2022, vol. 256, issue C

Abstract: The low thermal conductivity of PCMs limited thermal storage/release properties of latent heat thermal energy storage (LHTES) systems, and the performance enhancement of PCMs thermal conductivity, PCMs stages and operating conditions needed to be investigated simultaneously. This study selected polyethylene glycol (PEG) as PCM and expanded graphite (EG) as matrix to prepare composite PCMs (CPCMs). When the mass ratio of PEG:EG was 9:1 and CPCM density was 954.8 kg/m3, the thermal performance was excellent without leakage. Compared to the single-stage LHTES tank, the heat storage/release time of four-stage cascaded LHTES (CLHTES) tank was 1040/320s longer, the heat storage/release rate was 0.92/1.04 times and the maximum exergy efficiency was 10.6% higher. For the four-stage CLHTES tank, its heat storage/release rate was fast and efficiency was high at the inlet temperature of 75/10 °C and flow rate of 3 L/min. When the four-stage CLHTES tank was used in a solar heating system, a wider range of phase change temperatures (31.4–55.2 °C) and a longer delay time of temperature peak (2290s) were obtained. Therefore, the CLHTES tank with high thermal conductivity CPCMs could play a significant role in improving the storage/release performance of renewable energy sources.

Keywords: Composite phase change material; Cascaded latent heat storage; Experimental study; Solar heating system; Thermophysical characteristics (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:256:y:2022:i:c:s0360544222015420

DOI: 10.1016/j.energy.2022.124639

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