Welcome to the Exergoecology Portal
You are here: Home / Chemical Exergy Calculator / Instructions for the exergy calculator

Instructions for the exergy calculator

Instructions for the exergy calculator

How it works

  • If the chemical formula or name of the mineral introduced is in the database, the system will calculate its corresponding exergy and will show the standard Gibbs free energy and Enthalpy value with which the chemical exergy has been calculated.
  • If the system does not recognize the chemical formula introduced, it is still able to calculate its exergy once you enter its specific Gibbs free energy.
  • The given exergy is calculated with Eq.1 with the chemical exergy of the elements shown in Table 1, from the latest Reference Environment defined by Szargut et. al. 2005
  • The Gibbs free energy values are taken from Faure 1991, which is a compilation of the following sources: Woods and Garrels (1987), Weast et al. (1986), Drever (1982), Brookins (1988) , Lindsay (1979) , Krauskopf (1979) , Garrels and Christ (1965) and Tardy and Garrels (1974).

How to enter the chemical formula

  1. 1. The program will only recognize numbers and letters belonging to chemical elements. No special characters such as “-”; “+”; “.” are allowed:
    • You should write “Ag” for: “Ag+”; Ag+2”; “Ag (c)”; The output will show you all possible substances with compound formula “Ag”
    • Compound “NaAlSi2O6.2H2O” should be rewritten as: “NaAlSi2O6(H2O)2”
  2. 2. The program is sensible to upper and lower case letters:
    • "Co" is Cobalt, while "CO" is Carbon Monoxide
  3. 3. The program recognizes only parenthesis “( )”, do not include any square brackets “[ ]” or accolades “{ }”
EXERGY MANIFESTO
SUPPORTED BY
WHAT'S NEW?

TaesLab: New version!

New version of TaesLab available! Free download here.

TaesLab is a software tool designed for the thermoeconomic analysis of energy systems.

TaesLogo

RELEVANT BOOKS

The Material Limits of Energy Transition: Thanatia

Antonio Valero Capilla, Alicia Valero Delgado and Guiomar Calvo

This book provides a holistic view of raw mineral depletion in the context of renewable energy transistion.

The material limits Thanatia

BUY NOW

Thanatia. Los límites minerales del planeta

mites minerales del planeta

Antonio Valero Capilla and Alicia Valero Delgado interviewed by Adrián Almazán

We need a material transition, not only energetic, that restores nature and effectively reuses materials. Gaia must be cared for by extending life on Earth and slowing its degradation towards Thanatia.

Thanatia los limites

BUY NOW

Thermodynamics for Sustainable Management of Natural Resources

Cover Thermodynamics

Wojciech Stanek (Editor)

This book examines ways of assessing the rational management of nonrenewable resources. Integrating numerous methods, it systematically exposes the strengths of exergy analysis in resources management.

Thanatia: The Destiny of the Earth's Mineral Resources

Cover Thanatia

A Thermodynamic Cradle-to-Cradle Assessment by (author): Antonio Valero Capilla and Alicia Valero Delgado

Is Gaia becoming Thanatia, a resource exhausted planet? For how long can our high-tech society be sustained in the light of declining mineral ore grades, heavy dependence on un-recycled critical metals and accelerated material dispersion? These are all root causes of future disruptions that need to be addressed today.