Related Experiment Video
Updated: May 15, 2026
10:03
Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
Published on: October 5, 2018
Correlation between thermodynamic efficiency and ecological cyclicity for thermodynamic power cycles
Astrid Layton1, John Reap, Bert Bras
1George W. Woodruff School of Mechanical Engineering, Sustainable Design and Manufacturing, Georgia Institute of Technology, Atlanta, Georgia, USA. alayton6@gatech.edu
Plos One
|December 20, 2012
Summary
This study links ecological principles to engineering by applying the biological metric cyclicity to thermodynamic power cycles. Higher cyclicity correlates with greater maximum thermal efficiency, offering a new comparison method.
Area of Science:
- Thermodynamics
- Ecological Engineering
- Industrial Ecology
Background:
- Sustainable development necessitates integrating environmental considerations with engineering practices.
- Cyclical resource networks are increasingly adopted to enhance efficiency and minimize environmental impact.
- Industrial systems can benefit from mirroring natural ecological network patterns.
Purpose of the Study:
- To investigate the relationship between the cyclicity metric and the thermal efficiency of thermodynamic power cycles.
- To explore the applicability of a biological metric in an engineering context.
- To develop a novel method for comparing and evaluating power cycles.
Main Methods:
- The biological metric 'cyclicity' was applied to 28 distinct thermodynamic power cycles.
- The complexity of these cycles varied.
- A correlation analysis was performed between cyclicity values and maximum thermal efficiency.
Main Results:
- A positive correlation was observed between the cyclicity of thermodynamic power cycles and their maximum thermal efficiency.
- Higher cyclicity values indicate a greater potential for maximum thermal efficiency.
- This correlation holds despite significant scientific differences between engineered cycles and natural ecosystems.
Conclusions:
- The study establishes a direct link between ecological principles and engineering thermodynamics.
- Cyclicity serves as a valuable metric for predicting and comparing the potential thermal efficiency of power cycles.
- This finding encourages further research into fundamental connections between natural and engineered systems for sustainable solutions.
Related Concept Videos
01:26Carnot Cycle and Efficiency
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...
01:30The Carnot Cycle
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.
What could be the theoretical limit to the efficiency of a heat engine? The...
What could be the theoretical limit to the efficiency of a heat engine? The...
01:16Efficiency of The Carnot Cycle
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...
01:20The Carnot Cycle and the Second Law of Thermodynamics
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...
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...
00:46Trophic Efficiency
Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
01:18Entropy
The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...