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Publication Title | Thermophysical Properties at Critical and Supercritical Conditions

Organic Rankine Cycle

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1. Introduction

22

Thermophysical Properties at Critical and Supercritical Conditions

Igor Pioro and Sarah Mokry

University of Ontario Institute of Technology Canada

Prior to a general discussion on specifics of thermophysical properties at critical and supercritical pressures it is important to define special terms and expressions used at these conditions. For better understanding of these terms and expressions Fig. 1 is shown below.

35.0 32.5 30.0 27.5 25.0 22.5 20.0 17.5 15.0 12.5 10.0

7.5

5.0

200 250 300 350 400 450 500 550 600 650

Temperature, oC

Compressed Fluid Supercritical Fluid

High Density Low Density

(liquid-like)

(gas-like)

Pcr=22.064 MPa

Liquid

Critical Point

Superheated Steam

Steam

Fig. 1. Pressure-Temperature diagram for water.

Definitions of selected terms and expressions related to critical and supercritical regions

Compressed fluid is a fluid at a pressure above the critical pressure, but at a temperature below the critical temperature.

www.intechopen.com

Tcr=373.95 oC

Pressure, MPa

Pseudocritical Line

Saturation Line

Image | Thermophysical Properties at Critical and Supercritical Conditions



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