# Exergy analysis on throttle reduction efficiency based on real gas equations

*Yuxi Luo* and
*Xuanyin Wang*

*Energy*, 2010, vol. 35, issue 1, 181-187

**Abstract:**
This paper proposes an approach to calculate the efficiency of throttling in which the exergy (available energy) is used to evaluate the energy conversion processes. In the exergy calculation for real gases, a difficult part of integration can be removed by judiciously advised thermodynamic paths; the compressibility factor is calculated by using Peng–Robinson (P–R) equation. It is found that the largest deviation between the exergies calculated by the real gas equation and ideal gas assumption is about 1%. Because the exergy is a function of the pressure and temperature, the Joule–Thomson coefficients are used to calculate the temperature changes of throttling, based on the compressibility factors of the Soave–Redlich–Kwong (S–R–K) and P–R equations, and the temperature decreases are compared with those calculated by empirical formula. The result shows that the heat exergy contributes very little in throttling. The simple equation of ideal gas is suggested to calculate the efficiency of throttling for air at atmospheric temperatures.

**Keywords:** Efficiency of throttling; Exergy; Compressibility factor; Joule–Thomson effect; Real gas (search for similar items in EconPapers)

**Date:** 2010

**References:** View references in EconPapers View complete reference list from CitEc

**Citations** View citations in EconPapers (1) Track citations by RSS feed

**Downloads:** (external link)

http://www.sciencedirect.com/science/article/pii/S0360544209003946

Full text for ScienceDirect subscribers only

**Related works:**

This item may be available elsewhere in EconPapers: Search for items with the same title.

**Export reference:** BibTeX
RIS (EndNote, ProCite, RefMan)
HTML/Text

**Persistent link:** https://EconPapers.repec.org/RePEc:eee:energy:v:35:y:2010:i:1:p:181-187

Access Statistics for this article

Energy is currently edited by *Henrik Lund* and *Mark J. Kaiser*

More articles in Energy from Elsevier

Series data maintained by Dana Niculescu ().