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Related Concept Videos

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Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
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Mechanisms of Heat Transfer II01:20

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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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Mechanisms of Heat Transfer01:14

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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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Mechanisms of Heat Transfer I01:14

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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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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.
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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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High-performance multimode elastocaloric cooling system.

Suxin Qian1,2, David Catalini2, Jan Muehlbauer2

  • 1Department of Refrigeration and Cryogenic Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China.

Science (New York, N.Y.)
|May 18, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a high-performance elastocaloric cooling system using fatigue-resistant nitinol tubes. This innovative technology offers significant cooling power and temperature span, paving the way for commercializing advanced cooling solutions.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Sustainable Energy

Background:

  • Global climate change necessitates the development of refrigerants with zero global warming potential.
  • Caloric cooling techniques offer high efficiency but face challenges in scaling to practical applications.
  • Elastocaloric cooling is a nascent technology with potential for sustainable cooling solutions.

Purpose of the Study:

  • To develop and evaluate a high-performance elastocaloric cooling system.
  • To demonstrate the feasibility of using fatigue-resistant nitinol tubes in a novel heat exchange architecture.
  • To assess the potential of elastocaloric cooling for commercialization.

Main Methods:

  • Fabrication of a cooling system utilizing fatigue-resistant elastocaloric nitinol (NiTi) tubes.
  • Implementation of a versatile multimode heat exchange architecture.
  • Experimental testing to determine cooling power and temperature span.

Main Results:

  • Achieved a maximum cooling power of 260 watts.
  • Demonstrated a maximum temperature span of 22.5 Kelvin.
  • Reported performance metrics among the highest for caloric cooling systems.

Conclusions:

  • The developed elastocaloric cooling system exhibits high performance, showcasing significant cooling power and temperature span.
  • The use of fatigue-resistant NiTi tubes in a multimode heat exchanger is key to achieving these results.
  • Elastocaloric cooling presents a promising avenue for the commercialization of advanced, sustainable cooling technologies.