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Related Concept Videos

Radiation: Applications01:17

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Updated: Jan 12, 2026

Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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Radiative cooling with angular shields to mitigate atmospheric and parasitic heat loads.

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    Angular shields enable subfreezing radiative cooling without reducing power. This sustainable technology overcomes humidity and parasitic heating challenges, offering an efficient alternative to conventional cooling systems.

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    Area of Science:

    • Sustainable energy technologies
    • Thermal engineering
    • Materials science

    Background:

    • Radiative cooling offers a sustainable alternative to traditional vapor compression systems.
    • Achieving subfreezing temperatures is challenging, especially in humid conditions, due to atmospheric back-radiation and heat transfer.
    • Current angular-selective thermal emission strategies reduce radiated power, limiting cooling efficiency.

    Purpose of the Study:

    • To investigate angular shields for angularly selective thermal emission without power reduction.
    • To analyze the impact of spectral selectivity, humidity, and parasitic heating on cooling performance.
    • To determine conditions for achieving subfreezing temperatures using angular shielding.

    Main Methods:

    • Theoretical analysis of net radiative flux and equilibrium temperature.
    • Modeling of spectrally selective thermal emission.
    • Evaluation of angular shields versus engineered angular emission under varying environmental conditions.

    Main Results:

    • Spectrally selective thermal emission is crucial for efficient radiative cooling.
    • Angular shields outperform engineered angular emission in parasitic heating scenarios.
    • Angular shields enable subfreezing temperatures with simple insulation when atmospheric transmittance exceeds 70%.

    Conclusions:

    • Angular shielding is a viable strategy for enhancing radiative cooling performance.
    • This method effectively mitigates challenges posed by humidity and parasitic heating.
    • The technology presents a promising path towards sustainable subfreezing cooling solutions.