Photothermal energy storage application of light energy

What is photothermal phase change energy storage?

To meet the demands of the global energy transition, photothermal phase change energy storage materials have emerged as an innovative solution. These materials, utilizing various photothermal conversion carriers, can passively store energy and respond to changes in light exposure, thereby enhancing the efficiency of energy systems.

Are photothermal storage 3D phase change blocks controllable?

Therefore, a novel controllable strategy was proposed in this study to fabricate dual-functional photothermal storage three-dimensional (3D) phase change blocks (PCBs) with higher thermal conductivity (27.98 W/m·K) and spectral absorption (98.03 %) compared to those of most previously reported PCM-based devices.

How to calculate photothermal storage efficiency?

The following formula was used to calculate the photothermal storage efficiency: (7) η = m (Δ H + Q) I S (t e − t s) × 100 % where m is the mass of PCB-20, ∆ H and Q are the latent and sensible heats of PCB-20 respectively.

How does photothermal heat release work?

This device effectively controls temperature through photothermally driven heat release under conditions as low as −40 °C and achieves a high energy density of 380.76 J/g even at −63.92 °C. The thermal effect is primarily due to light-induced molecular isomerization, a nonradiative relaxation process.

Why do photothermal interfaces have limited sunlight absorption?

While the aforementioned techniques modify the light-absorption properties of the PCM interface, the resultant photothermal interfaces exhibit limited sunlight absorption owing to the intricate nature of the preparation methods and unpredictable interfacial morphology.

What is the maximum photothermal storage efficiency of 3d-pcb-20?

At a solar-radiation intensity of 2 kW/m 2, the maximum photothermal storage efficiency of 3D-PCB-20 was 93.04 %, whereas that of 2D-PCB-20 was only 70.63 % (Fig. 7 c). This is because the high solar flux can shorten the energy storage duration and thus reduces heat losses.