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Chapter 4: Modeling where Un is a nominal heat transfer determined by the complete steady state model (section 2.2 ) for the nominal flow rate M ̇ n . m is the Reynolds exponent and is equal to 0.8 for turbulent flows. For the boiling and condensing heat transfer coefficients, such a simplification is trickier since the latter also depends on the heat flux through the heat exchanger. However, in order to keep the model as simple as possible and since two-phase heat transfer coefficients are generally high compared to the secondary fluid heat transfer coefficient, it is decided to assume the boiling number constant to simplify equations (32) and (34). Another non-negligible influence is the vapor quality. However, since an average heat transfer coefficient is assumed for the whole two-phase zone, this influence is not taken into account. The evaporation heat transfer is evaluated from a correlation provided by (Y.- Y. Yan & Lin, 1999). In this correlation, the Nusselt number depends on the Prandlt, Reynolds and Boiling numbers. The exponent of the Reynolds number being 0.5, the following relation can be written: Ul Ul+(Utp−Ul)⋅(1+sin( π⋅x )) for x<−Δx for −ΔxPDF Image | Organic Rankine Cycles for Waste Heat Recovery and Solar Uses
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