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Related Concept Videos

Calorimetry01:19

Calorimetry

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When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
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Heating and Cooling Curves02:44

Heating and Cooling Curves

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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, and its...
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Specific Heat01:16

Specific Heat

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The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or...
66.6K
Heat Flow and Specific Heat01:12

Heat Flow and Specific Heat

6.4K
Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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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...
1.7K
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

5.5K
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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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

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Caloric materials for cooling and heating.

X Moya1, N D Mathur1

  • 1Department of Materials Science, University of Cambridge, Cambridge, UK.

Science (New York, N.Y.)
|November 13, 2020
PubMed
Summary
This summary is machine-generated.

Caloric heat pumps, including magnetocaloric, electrocaloric, and mechanocaloric effects, offer promising solutions for efficient cooling and heating. Recent advances unify these technologies to combat climate change.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Sustainable Energy

Background:

  • Magnetocaloric materials have been used for heat pumping for decades.
  • Electrocaloric and mechanocaloric materials have gained attention more recently.
  • Caloric effects offer a unified approach to advanced heat pump technology.

Purpose of the Study:

  • To highlight the significance of current research in caloric effects.
  • To discuss recent advancements in caloric materials, measurements, and prototypes.
  • To emphasize the potential of caloric heat pumps in addressing climate change.

Main Methods:

  • Review of recent literature on caloric effects.
  • Analysis of advancements in materials discovery and characterization.
  • Examination of prototype development and performance.

Main Results:

  • Caloric research has unified magnetocaloric, electrocaloric, and mechanocaloric phenomena.
  • Significant progress has been made in developing novel caloric materials.
  • Prototypes demonstrate the potential for efficient cooling and heating applications.

Conclusions:

  • Caloric heat pumping is a rapidly advancing field with significant potential.
  • This unified research area is crucial for developing sustainable energy solutions.
  • Further development of caloric materials and devices is essential for practical applications.