Influence of the storage period between charge and discharge in a latent heat thermal energy storage system working under partial load operating conditions
Data de publicació2019
MetadadesMostra el registre d'unitat complet
The supply intermittency of energy sources like solar energy or industrial waste heat should be properly addressed when studying latent heat thermal energy storage (TES) systems, since it might cause an incomplete melting/solidification of phase change materials (PCM). In the present paper, and experimental study was performed to analyse the storage period (also known as stand-by period) in a latent heat TES system working under partial load operating conditions and the effect of its duration on the subsequent discharging process. In the experimental set-up, 99.5 kg of high density polyethylene (HDPE) was used as PCM in a 0.154m3 storage tank based on the shell-and-tube heat exchanger concept. Four different percentages of charge were evaluated: 58%, 73%, 83% (partial charge), and 97% (full charge). Each charging level was followed by three different periods of storage: 25 min, 60 min, and 120 min. The fact of working at different levels of charge caused that in some regions of the TES system the PCM was not completely melted. Thus, at the end of the charging process different levels of thermal homogenisation were observed. However, during the storage period, the PCM temperature showed a tendency to homogenisation, which was influenced by the energy distribution within the PCM, the heat losses, and the duration of the storage period. Focusing on the discharging period, it was observed that the duration of the storage period slightly affected the temperature and heat transfer profiles, causing the main differences of performance during the first 30 min of process.
És part deApplied Energy, 2019, vol. 235, p. 1389-1399
Projectes de recerca europeus
Els fitxers de llicència següents estan associats amb aquest element:
Mostrant elements relacionats per títol, autor i matèria.
Gasia, Jaume; Gracia Cuesta, Alvaro de; Peiró Bell-lloch, Gerard; Arena, Simone; Cau, Giorgio; Cabeza, Luisa F. (Elsevier, 2018)A proper management of thermal energy storage (TES) charging and discharging processes allows the final users to optimize the performance of TES systems. In this paper, an experimental research is carried out to study how ...
Numerical analysis of a latent heat thermal energy storage system under partial load operating conditions Arena, Simone; Casti, Efisio; Gasia, Jaume; Cabeza, Luisa F.; Cau, Giorgio (Elsevier, 2018)One of the features that should be considered when designing a thermal energy storage (TES) system is its behaviour when subjected to non-continuous (partial loads) operating conditions. Indeed, the system performance can ...
Vérez, David; Borri, Emiliano; Crespo, Alicia; Mselle, Boniface Dominick; Gracia Cuesta, Alvaro de; Zsembinszki, Gabriel; Cabeza, Luisa F. (MDPI, 2021)The use of latent heat thermal energy storage is an effective way to increase the efficiency of energy systems due to its high energy density compared with sensible heat storage systems. The design of the storage material ...