Notation
Variables with dimensions
Dimensionless variables
Subscripts
| b | relating to boundary layer |
| cr | value at critical point |
| d | unswept, or ‘dead’ |
| c, C | relating to compression space |
| e, E | relating to expansion space |
| e | relating to excitation (or free-stream) conditions |
| g | relating to working gas (or fluid) |
| L, R | left, right |
| L, U | lower, upper |
| 0 | (zero) ambient value of (e.g. T0) |
| opt | optimum value of |
| r | relating to regenerator |
| ref | reference value of |
| su | relating to Sutherland equation for temperature dependence of fluid property |
| w | relating to wall or wire (of regenerator) |
| x | (heat) exchanger |
| xc | relating to compression exchanger |
| xe | relating to expansion exchanger |
| 1, 2, 3 | strategic points on cycle diagram |
| I, II | I-wave (right-running) or II-wave (left-running) ... |
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