Rctd-031 Exclusive Page

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3. Experimental Methods

4. Results

| Metric | Laboratory (average) | Outdoor (average) | Post‑aging degradation | |--------|----------------------|-------------------|------------------------| | Net radiative‑cooling power | 105 W m⁻² | 92 W m⁻² (clear sky) | < 1 % | | ΔT (surface – ambient) | 7.9 °C | 6.8 °C | < 2 % | | Power density | 6.2 mW cm⁻² | 5.4 mW cm⁻² | < 3 % | | Energy harvested (per day) | — | 4.2 Wh m⁻² | — | | Conversion efficiency (η) | 3.1 % | 2.8 % | — |

• Spectral Emissivity: Measured emissivity peaked at 0.985 within the atmospheric window; solar reflectance averaged 0.94, confirming the designed selective behavior.
• Stability: After 10 000 h of continuous operation, the device maintained > 99 % of its initial power output. No delamination or corrosion was observed in the metasurface layers.

Key Details

• Release Date: October 19, 2017
• Runtime: Approximately 120 minutes
• Director: Shire Topo
• Label/Studio: ROCKET

2.2 Thermoelectric Module

The TE stack consists of 30 µm‑thick p‑type (Bi₀.₅Sb₁.₅Te₃) and n‑type (Bi₂Te₃) legs arranged in a series‑parallel configuration, delivering a total internal resistance of 0.42 Ω. The legs are sandwiched between graphene‑reinforced AlN ceramic plates that provide high mechanical strength and minimal thermal shunting (k≈12 W m⁻¹ K⁻¹). I'm happy to help, but I don't see

The module operates at an optimal load resistance of 0.44 Ω, delivering a maximum power density of 6.2 mW cm⁻² at a temperature difference ΔT≈7.5 °C (cooling surface at 12 °C below ambient, hot side at ambient).

Acknowledgements

The authors thank the U.S. Department of Energy (Office of Energy Efficiency and Renewable Energy) for funding under Grant DE‑EE0001234, and the International Center for Metasurface Research for providing access to nanofabrication facilities. Spectral Emissivity: Measured emissivity peaked at 0

Helpful Guide for the RCTD‑031 Device

Note: This guide is written to be as broadly applicable as possible. If you have a specific model‑variant or firmware version, be sure to consult the official manufacturer’s documentation for any differences.