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By Graham Walker

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The temperature and pressure remain the same but the piston will move a long way up the cylinder. The volume of the evaporated state is much greater than the liquid state. The heat added to cause evaporation of the working fluid is called the latent heat (or enthalpy) of vaporization. In the process of vaporizing we can think of the fluid moving from point B to point C. At some intermediate point, say D, we can talk about the fluid having a "vapor fraction" x. This is the fraction of fluid at the saturated vapor state C.

4. There are an infinite number of process paths 36 Chapter 2 D T F Fig. 4. Representation of thermodynamic processes on the T-S diagram. which the system may change from state A to state B. Three such paths are shown. The most direct ,route between A and B is the straight line process ACE. An alternative involving some high temperatures is the path ADB. Another alternative involving low temperatures is the process AEB. Whatever the path followed the state properties at B will always be the same.

Walker, G. (1980). Stirling Engines. Oxford University Press, Oxford. , J. (1983). Free-Piston Stirling Engines (in preparation). 28 Chapter 1 Woodard, R. , Welch, P. , and Jansson, R. M. (1978). "Manufacturing Methods and Technology for the Establishment of Production Techniques for a Split-Cycle Stirling Cryogenic Cooler," Report No. S. Army Elec. R. and D. , Orlando, Florida). Zimmerman, J. , and Radebaugh, R. (1977). "Operation of a SQUID in a Very Low-Power Cryocooler. App. of Closed Cycle Cryocoolers to Small Superconducting Devices," Proc.

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