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Online determination of exergy

The calculation routine ExEst is a tool that has been developed to simplify the approximation of exergy losses. ExEst is a software program that estimates in a simple, fast and systematic way the exergy of 71 different compounds. This tool mainly is suitable for small and medium-sized production locations with chemical and/or thermal processes.

Calculation routine
The calculations are based on integrated polynomial functions for the values of specific heat, enthalpy and entropy. The calculation routine also takes into account phase transitions. On the Dutch language page, a Dutch version of the same tool is available.  The use of a polynomial function for the calculation of the enthalpy and entropy values has the disadvantage that the value slightly deviates from the real values, that can be found in the tables of handbooks. The data of a large number of renowned sources has been used. Errors never exceed the value of 5%. If you want more information concerning the concept of exergy and/or the calculationroutine ExEst you can have a look at the website or send an e-mail with questions.

Calculation
First choose a component and fill out the temperature and pressure. Since the enthalpy and entropy are compared with reference conditions, the calculation needs a reference temperature and a reference pressure. The chemical exergy can be checked optionally. The units of both temperature and pressure can be selected from two kinds of units. Please note: ExEst is only meant for fluids, i.e. gas and liquid phase chemicals. For carbon and sulphur only the chemical exergy should be used.
Click here tot start the tool >

For questions about ExEst please contact CCS at the following email address exergy@cocos.nl


 
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