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Figure 7 shows the radial temperature profile through a full storage cycle. The surface node is heated directly, causing an internal thermal gradient easily observed toward an adiabatic boundary condition at the fifth (black line) radial node. The temperatures approach thermal equilibrium between the charging and discharging before the thermal gradient is reversed during discharging and the concrete is cooled. The surface is now the coolest portion of the concrete and heat is being drawn out. In this specific model, the concrete can achieve radial thermal equilibrium between the discharging and charging phases. Figure 7. Radial temperature (°C) profile during charging then discharging cycle. Figure 8 shows the CTES energy storage content throughout the daily cycle, reset to 0 before the charging and discharging cycle. The energy content is measured by the heat transfer in and out of the concrete surface. Figure 8. Storage energy content during charging, discharging cycle. 2.2.2 Dual pipe Configuration Results Figure 9 contains the surface temperature profile in the dual-pipe configuration during repeated charging and discharging cycles. The temperature gradient along the axis of fluid flow always remains in the same direction throughout the simulation. Note that this is the surface along the charging pipe only. A similar behavior is observed on the discharging pipe. 8PDF Image | Thermal Energy Storage Model Development
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