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Related Concept Videos

Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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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?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
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Thermal Stress01:09

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
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Appearance is a multidimensional aspect of self-presentation that encompasses observable attributes such as clothing, grooming, speech, and nonverbal behavior. These elements are often strategically managed to align with socially constructed expectations in different settings. For instance, individuals tailor their appearance during job interviews, social gatherings, or athletic events to meet the perceived norms of those environments.Contextual Adaptation and Social SignalsThe research...
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Related Experiment Video

Updated: Jan 22, 2026

Making Record-efficiency SnS Solar Cells by Thermal Evaporation and Atomic Layer Deposition
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Making Record-efficiency SnS Solar Cells by Thermal Evaporation and Atomic Layer Deposition

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Multilayer hydrogel thermal management for high-efficiency solar cells.

Rui Guo1, Haotian Ding1, Haoyu Pan1

  • 1Key National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, Department of Materials Science and Engineering, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.

Science Bulletin
|January 20, 2026
PubMed
Summary

This study introduces a novel thermal management system to boost solar cell power conversion efficiency (PCE). The system enhances PCE by over 1% through advanced cooling and waste heat recovery, improving photovoltaic (PV) panel performance.

Keywords:
Energy conversion efficiencyEnergy harvestingSolar cellThermal managementWaste heat recovery

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Area of Science:

  • Materials Science
  • Energy Science
  • Thermodynamics

Background:

  • Monocrystalline silicon photovoltaic (PV) panel power conversion efficiency (PCE) has seen minimal improvement (~1%) over the last decade.
  • Enhancing solar cell PCE is crucial for renewable energy advancements.

Purpose of the Study:

  • To develop a general strategy for improving practical PCE in solar cells.
  • To integrate a layered thermal-management module combining evaporative cooling and radiative heat dissipation.

Main Methods:

  • Designed a layered thermal-management module integrating evaporative cooling and radiative heat dissipation.
  • Monitored in-situ temperature to observe thermal buffering effects.
  • Measured waste heat recovery for thermoelectric power generation.

Main Results:

  • Achieved up to 332 W m⁻² cooling power, reducing solar cell temperature by over 20 °C.
  • Demonstrated a 1.1% increase in actual working PCE under high-temperature conditions.
  • Observed a giant thermal buffering effect, reducing grid impact and extending solar cell lifespan.
  • Recovered waste heat to generate 713 mW m⁻² of additional thermoelectric (TE) power.

Conclusions:

  • The proposed scalable thermal-management module is compatible with various solar cells (silicon, gallium arsenide, perovskite).
  • The system offers significant environmental and economic benefits for existing photovoltaic power plants.
  • This strategy effectively enhances solar cell performance and longevity.