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Related Concept Videos

Thermodynamic Systems01:06

Thermodynamic Systems

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A thermodynamic system is a set of objects whose thermodynamic properties are of interest. The system is considered to be embedded in its surroundings or the environment. The system and its environment can exchange heat and do work on each other through a boundary that separates them. However, the immediate surroundings of the system interact with it directly and therefore have a much stronger influence on its behavior and properties.
Consider an example of  tea boiling in a kettle. The...
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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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Efficiency of The Carnot Cycle01:16

Efficiency of The Carnot Cycle

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The hypothetical Carnot cycle consists of an ideal gas subjected to two isothermal and two adiabatic processes. Since the internal energy of an ideal gas depends only on its temperature, which is the same before and after the completion of the Carnot cycle, there is no change in its internal energy. Hence, using the first law of thermodynamics, the total heat exchanged by the ideal gas equals the total work done. Thus, we can quantify the efficiency of the Carnot cycle via the heat exchanged...
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The Carnot Cycle01:30

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Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
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The Carnot Cycle and the Second Law of Thermodynamics01:20

The Carnot Cycle and the Second Law of Thermodynamics

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The Carnot engine works between two heat reservoirs of fixed temperatures. The Carnot cycle begs the following question: Is it possible to devise a heat engine that is more efficient than a Carnot engine between two fixed temperatures? The answer lies in designing a Carnot refrigerator.
Since the individual steps in a Carnot cycle can be reversed, the entire cycle is, thus, reversible. If a Carnot cycle is reversed, it becomes a Carnot refrigerator. It extracts heat Qc from a cold reservoir at...
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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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Chart for Thermoelectric Systems Operation Based on a Ternary Diagram for Bithermal Systems.

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Summary

Thermoelectric systems can be optimized for power conversion by analyzing operating conditions. This study details performance modes, efficiencies, and power outputs, considering material properties and external factors for better thermoelectric device design.

Keywords:
figure of meritfinite time thermodynamicsoperating modesternary diagram for bithermal systemsthermoelectric system optimal performance

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Area of Science:

  • Physics
  • Materials Science
  • Thermodynamics

Background:

  • Thermoelectric systems require careful operation for optimal power conversion.
  • Bithermal systems analysis using ternary diagrams provides insights into work-heat conversion.
  • The standard model of Ioffe is foundational for thermoelectric analysis.

Purpose of the Study:

  • To graphically and analytically characterize thermoelectric system operation modes.
  • To determine optimal efficiencies and powers for heat pump and heat engine modes.
  • To analyze the impact of operating conditions and material properties on performance aims.

Main Methods:

  • Plotting thermoelectric system operation as a parametric curve based on the Ioffe model.
  • Graphical and analytical characterization of operating modes, efficiencies, and powers.
  • Entropy generation analysis to discuss semiconductor phenomena (Seebeck effect, heat leakage, Joule effect).

Main Results:

  • Defined thresholds for heat engine, heat pump, thermal dissipation, and forced thermal transfer modes.
  • Quantified optimal efficiencies and powers for heat pump and heat engine modes.
  • Highlighted the sensitivity of performance aims (max efficiency vs. max power) to operating conditions.

Conclusions:

  • The study provides a comprehensive analysis of thermoelectric system performance under various conditions.
  • Understanding entropy generation and external resistances is crucial for optimizing thermoelectric devices.
  • The findings offer insights for tailoring thermoelectric system operation to specific application requirements.