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Performance assessment of a porous flow distributor in arresting the effect of temperature fluctuation in a thermocline system
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DOI：10.1016/j.tsep.2024.102942.png)
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Abstract
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Performance of a thermocline storage integrated solar thermal system is susceptible to mixing due to thermal fluctuations. In present study, the effect of thermal fluctuations is investigated on a thermal energy storage system with co-axial porous flow distributor. First aspect of work is to examine the effect of thermal fluctuations on performance of thermocline storage systems, and the second is to understand the role of a porous distributor in mitigating thermal fluctuations. Numerical simulations for charging a storage tank are performed with inlet temperature perturbation in the form of a box and a sinusoidal function. Simulations on storage tank are carried out for wide range of charging rates, represented as Peclet numbers, with and without flow distributor. The axial temperature profiles with temperature fluctuation are compared against the base case without any inlet temperature perturbation. Further, the performance of the flow distributor is inferred by comparing the Stratification number, Mix number, and charging efficiencies during charging of the tank with and without distributor. It is observed that the distributor helps to preserve the thermal stratification in tank when the inlet temperature is perturbed. The effectiveness of porous distributor increases with the Peclet number. Higher charging efficiencies are obtained in the presence of distributor with a maximum difference of 5.38%.
Keywords:
Solar thermal energy
Single-media thermocline (SMT)
Thermal energy storage (TES)
Porous flow distributor
Thermal fluctuation charging
Charging efficiency
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