Consequently, the temperature
difference of the fluid between the inlet and wall is 2 C,
sufficiently small to avoid the rapid change of fluid properties
around the pseudo-critical point. From calculations changing inlet
temperature and the flow rate, the Nusselt number correlations for
the water (cold) side and CO2 (hot) side can be obtained individually.
A method to evaluate the heat transfer performance of the
whole heat exchanger from the two correlations is proposed. The
method through the new correlations is validated through comparison
with experimental results using a test piece of the hot water