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Production Efficiency01:01

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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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The Second Law of Thermodynamics asserts that it's impossible for any heat engine to achieve 100% efficiency. While contemplating the maximum possible efficiency, Nicolas Sadi Carnot conceptualized an ideal heat engine. This engine gets its energy from a high-temperature reservoir. It then performs some work and releases the remaining energy into a low-temperature reservoir.The Carnot cycle, named after Sadi Carnot, is fully reversible. The cycle consists of four distinct stages. In the first...
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The Carnot Cycle01:30

The Carnot Cycle

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Mechanical Efficiency of Real Machines01:14

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The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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Published on: August 1, 2017

Exergy efficiency in industry: where do we stand?

Robert U Ayres1, Laura Talens Peiró, Gara Villalba Méndez

  • 1INSEAD- Campus Europe, Boulevard de Constance, 77305 Fontainebleau, France. robert.ayres@insead.edu

Environmental Science & Technology
|November 3, 2011
PubMed
Summary

Second law efficiency, considering thermodynamic potential, reveals significant underperformance in U.S. industries and the overall economy. This thermodynamic analysis highlights substantial opportunities for energy efficiency improvements.

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Area of Science:

  • Thermodynamics
  • Chemical Engineering
  • Energy Systems Analysis

Background:

  • Efficiency metrics often rely on the first law of thermodynamics, focusing solely on energy conservation.
  • This approach overlooks the quality of energy and the potential for improvement, leading to misconceptions.
  • A more comprehensive measure, second law efficiency, accounts for thermodynamic potential (exergy).

Purpose of the Study:

  • To critically evaluate energy efficiency in industrial and economic sectors using second law principles.
  • To compare second law efficiencies with commonly cited first law efficiencies.
  • To identify the potential for improvement in energy utilization.

Main Methods:

  • Calculating second law efficiency as the ratio of potential useful (exergy) output to potential useful (exergy) input.
  • Estimating second law efficiencies for the inorganic and organic chemical industries.
  • Assessing the second law efficiency for the U.S. industry sector and the overall U.S. economy.

Main Results:

  • Second law efficiencies for the inorganic and organic chemical industries were estimated at 29% and 35%, respectively.
  • The U.S. industry sector's second law efficiency was estimated at 37.6%.
  • The overall U.S. economy's second law efficiency was found to be significantly lower, at 7.7%.

Conclusions:

  • Second law efficiencies are substantially lower than first law efficiencies, indicating significant potential for energy savings.
  • Published first law efficiencies for U.S. industry (80%) and the overall economy (42.5%) mask considerable inefficiencies.
  • Implementing second law analysis is crucial for accurate assessment and targeted improvements in energy efficiency.