Exergoeconomic Analysis
Also known as: exergy costing, thermoeconomic analysis
Exergoeconomic analysis combines thermodynamics and economics by assigning monetary costs to exergy streams. It reveals how thermodynamic irreversibilities translate into economic losses within industrial systems. This approach enables engineers to identify the most economically significant inefficiencies and make informed decisions about component improvements and system optimization.
Key highlights
- Integrates thermodynamics and economics in a unified framework
- Reveals economically significant irreversibilities not evident from exergy analysis alone
- Enables rational cost allocation for multi-product systems
- Guides improvement prioritization based on economic impact
Intuition
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How it works
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When to use it
Use exergoeconomic analysis for complex energy systems where optimization must balance thermodynamic and economic objectives. It is particularly valuable for systems with multiple products (e.g., cogeneration plants) or when capital costs are significant. Avoid using for simple systems where exergy destruction distribution is obvious or when reliable cost data is unavailable.
Strengths & limitations
- Integrates thermodynamics and economics in a unified framework
- Reveals economically significant irreversibilities not evident from exergy analysis alone
- Enables rational cost allocation for multi-product systems
- Guides improvement prioritization based on economic impact
- Requires reliable economic data that may be difficult to obtain or verify
- Results depend sensitively on assumptions about component lifetimes and cost evolution
- Cannot directly optimize capital vs. operating cost trade-offs without additional optimization
- More complex than pure thermodynamic or pure economic analysis
Common pitfalls
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Applications
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Frequently asked
What is an exergy cost and how does it differ from economic cost?
An exergy cost (Z_ex) is the unit monetary cost per unit exergy flow. It captures the relationship between thermodynamic irreversibility and economic loss. Components destroying high-exergy material have high economic cost per unit, guiding investment decisions.
How do I allocate capital costs in a multi-product system like a cogeneration plant?
Common methods include allocation by exergy content of products, by thermodynamic product definition, or by economic benefit. Each method has physical meaning; choice depends on decision context and stakeholder priorities.
Can exergoeconomic analysis predict absolute profitability?
No. It reveals how thermodynamic inefficiency translates to costs and guides improvement prioritization. Absolute profitability depends on market prices, competition, and external factors beyond the scope of this analysis.
Sources
- 1.Tsatsaronis, G. (1993). Thermoeconomic analysis and optimization of energy conversion processes. Progress in Energy and Combustion Science, 19(4), 323-356.
- 2.Lozano, M. A., & Valero, A. (1994). Theory of exergetic cost. Energy Policy, 21(12), 1109-1140.
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Cite this page
ScholarGate. (2026, June 3). Exergoeconomic Analysis. ScholarGate. https://scholargate.app/thermodynamics/exergoeconomic-analysis