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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q,...
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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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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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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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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Integrating Radiative Cooling and Solar Heating for On-Demand Thermal Management.

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Summary
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Dual-mode devices combine passive radiative cooling with solar heating for versatile temperature control. This approach overcomes limitations of single-mode systems, enabling on-demand cooling and heating in fluctuating environments.

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Area of Science:

  • Sustainable energy technologies
  • Thermal management

Background:

  • Passive radiative cooling offers a sustainable alternative to conventional cooling systems.
  • Sole reliance on radiative cooling is limited in fluctuating temperatures and can cause overcooling.
  • Integrating solar heating with radiative cooling creates dual-mode devices for enhanced thermal management.

Purpose of the Study:

  • To summarize recent advancements in switchable dual-mode radiative cooling and solar heating devices.
  • To highlight key design strategies for these dual-mode systems.
  • To discuss future prospects for practical applications of on-demand radiative cooling and heating.

Main Methods:

  • Review of current research on dual-mode radiative cooling and solar heating systems.
  • Categorization of design strategies into Janus and all-in-one approaches.
  • Analysis of challenges and opportunities for technological advancement.

Main Results:

  • Dual-mode devices effectively integrate passive radiative cooling and solar heating.
  • Janus and all-in-one designs represent primary strategies for switchable functionality.
  • The integration addresses limitations of single-mode systems in variable thermal conditions.

Conclusions:

  • Switchable dual-mode devices offer a promising solution for on-demand thermal management.
  • Further research is needed to overcome challenges and realize practical applications.
  • Advancements in this field pave the way for more sustainable and versatile cooling and heating solutions.