The enthalpy, entropy, and exergy flows resulting from the real gas effects of in ideal pulse tube cryocoolers are described. The discussion follows a previous description of the real gas effects of in ideal pulse tube cryocoolers and makes use of a recently developed model of the thermophysical properties of This model is used to describe how the thermodynamic flows are affected by real gas phenomena of and compares these effects to similar effects for
The analysis was done over the pressure range 0.3–2 MPa and temperatures down to 1 K. At 2 MPa there is almost no difference in the cooling power between and At lower pressures, using is advantageous. There is a 1–2 K reduction in the cooling power vs. temperature curves compared to those for in the 0.3–1 MPa range.
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