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Summary In this paper, the solidification process of the phase change material (PCM) in the shell-and-tube latent-heat thermal energy storage unit (LTESU) strengthened by fin is studied. For improv...
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In this regard, sensible , latent , and thermo-chemical energy storage are the three important methods of thermal energy storage (TES) for solar energy utilization and peak load shifting , .
Taking the LTESU with no-fins as a comparison basis, the heat storage intensity of increases by 104.33%, the heat storage and exergy efficiency reduce by 22.64% and 7.23%, respectively, for case 4. The exergy efficiency increases by 8.53% when the fin layout is changed from no-fins case to case 1.
Moreover, the exergy efficiency of LTESU decreases with the increase of THTF,in, and its decrement rate is increasing. It can be seen that the exergy efficiency decreases by 8.71% when the THTF,in is increased from 333 to 353 K. Similar trend can also be observed for other cases also.
The heat storage represents the amount of energy stored in LTESU, which is described as follows: (19) Q storage = Q s, s e n s + Q l, s e n s + Q H (20) Q s, s e n s = m PCM C PCM, s T PCM, s - T 0 1000 (21) Q l, s e n s = m PCM C PCM, l T PCM - T PCM, l 1000 (22) Q H = m PCM L PCM 1000
It is seen that the heat storage and the exergy efficiency improve by 3.21% and 8.53%, respectively, when the fin layout is changed from no-fins case to case 1, whilst they decrease by 2.64% and 7.23%, when the fin layout is changed from no-fins to case 4. Moreover, the fin layout plays a significant role in the heat storage intensity of LTESU.
As displayed in Fig. 6 (c), the heat storage of LTESU increases with incrementing the HTF inlet velocity, and its growth rate (taking the vin = 1.5 m/s reference) is also increased. For example, the heat storage amount is increased by 0.28% when the vin is increased to 7.5 m/s.
