Auxiliary Equation for the Boundary between Regions 2 and

The boundary between regions 2 and 3 (see Fig. 1) is defined by the following simple quadratic pressure-temperature relation, the B23-equation

where K = pip* and 6 = T/ T* with p* = 1 MPa and T* = 1 K. The coefficients n1 to n3 of Eq. (5) are listed in Table 1. Equation (5) roughly describes an isentropic line; the entropy values along this boundary line are between s = 5.047 kJ kg"1 K"1 and s = 5.261 kJ kg"1 K"1.

Alternatively Eq. (5) can be expressed explicitly in temperature as

0 0

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