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Chapter 4: Modeling Figure 42: Three zones, moving boundaries heat exchanger evaporator model Each heat transfer coefficient U is calculated by considering two convective heat transfer resistances in series (secondary fluid and refrigerant sides). 1= 1+ 1 U hf hsf (27) The respective heat transfer area of each zone is obtained by imposing the total heat transfer area of the heat exchanger: Al+Atp+Av=(Np−2)⋅L⋅W (28) where Np is the number of plates, L is the plate length between inlet and outlet ports and W is the plate width between gaskets (Figure 43). The heat exchangers considered in the studied applications show relatively low pressure drops (typically not more than 200 mbar). Therefore, to facilitate the convergence of the numerical iteration process, these pressures drops are summed and lumped into one single pressure drop on the vapor exhaust line. Δptot=Δpl+Δptp+Δpv (29) The vapor line is selected because pressure drops in liquid state are relatively smaller in plate heat exchangers. 13 Figure 43: Plate heat exchangerPDF Image | Organic Rankine Cycles for Waste Heat Recovery and Solar Uses
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