The model conductance UASH,model is checked against the NTU
conductance UASH,NTU. The initial guess of the fraction of the tube
length required for de superheating, FSH, is iterated until UASH,model
and UASH,NTU converge. Upon convergence, the fraction of tube
length required for de superheating is known and the process is
repeated for the two-phase section.