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Related Concept Videos

Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

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.
A household refrigerator removes heat from the...
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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...
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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.
Thermodynamic Potentials01:26

Thermodynamic Potentials

Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...

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Related Experiment Video

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
11:04

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Leveraging gigawatt potentials by smart heat-pump technologies using ionic liquids.

Peter Wasserscheid1, Matthias Seiler

  • 1Lehrstuhl für Chemische Reaktionstechnik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany. wasserscheid@crt.cbi.uni-erlangen.de

Chemsuschem
|January 29, 2011
PubMed
Summary

Developing novel ionic liquid (IL)-based heat pumps offers a sustainable solution for industrial waste heat recovery. This technology promises higher efficiencies and reduced environmental impact in energy transformation systems.

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Area of Science:

  • Sustainable energy technologies
  • Thermochemical engineering
  • Materials science

Background:

  • Global energy challenges necessitate efficient heat production, storage, and transformation systems.
  • Significant industrial energy is wasted as low-temperature heat (40-80°C) due to inefficient technologies.
  • Current heat transformation methods lack the efficiency required for optimal energy utilization.

Purpose of the Study:

  • To introduce a novel heat-transformation technology utilizing ionic liquid (IL)-based working pairs.
  • To address the challenge of low-grade waste heat recovery in industrial applications.
  • To enable advancements in smart heat pumps for improved energy efficiency.

Main Methods:

  • Development and application of novel ionic liquid (IL)-based working pairs for heat pumps.
  • Engineering of heat-transformation devices incorporating these new IL-based pairs.
  • Investigation of thermodynamic properties and performance of IL-based heat pump systems.

Main Results:

  • Achieved significantly higher potential efficiencies in heat-transformation devices.
  • Demonstrated reduced corrosion rates and enhanced thermal stability with IL-based working pairs.
  • Enabled higher driving temperatures for multi-effect absorption chillers, utilizing waste energy.

Conclusions:

  • Ionic liquid (IL)-based heat pumps represent a breakthrough in efficient energy transformation.
  • This technology unlocks the potential of industrial waste heat, improving sustainability.
  • The novel working pairs facilitate advanced heat pump designs with broader applications.