Can PCM capsule filling structure be optimized for packed-bed heat storage system?
Based on the experimental platform, this paper proposed an optimized two-layered PCM capsule filling structure of packed-bed heat storage system (OT-PTES), considering the PCM phase transition temperature, capsules size, filling volume ratio and other parameters.
What is the arrangement of spherical capsules and temperature measuring points?
The arrangement of spherical capsules and temperature measuring points in PLTES. At the same time, HTF and PCM were measured more intuitively in real-time to investigate the temperature variation trend of different positions in the packed-bed. The arrangement of the temperature measuring point in the tank is illustrated in Fig. 7 (a).
Do capsule combination parameters affect OT-PTEs efficiency?
Fig. 21 shows the variation in an overall efficiency of the OT-PTES system with capsule combination parameters. According to previous studies, the cascade packed-bed could achieve higher overall efficiency compared to the single packed-bed filled with PCM capsules of the same diameter.
Which two-layered heat storage system has a higher thermal efficiency?
It can be seen that the OT-PTES system has a higher thermal efficiency. In summary, it can be concluded that the optimized two-layered heat storage system has better thermal performance and better development prospects, which can be further applied to research. Table 2. Comparison of thermal performance parameters of three system. Fig. 14.
Does a cascaded PTEs system work with PCM capsules?
To date, there are few experiments reported to investigate the performance of the cascaded PTES system using PCM capsules. Most experiments focus on the dynamic charging/discharging process of the single type of PTES systems. Wang et al. designed and constructed a new medium–high temperature packed-bed heat storage system.
What is the heat transfer process of PCM capsule and heat transfer fluid?
The heat transfer process of PCM capsule and heat transfer fluid (HTF) during charging/discharging process were studied in detail by experiments. Under consistent working conditions, the average charging/discharging rate, total heat capacity, overall efficiency, and exergy efficiency was evaluated.
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