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Sustainability 2015, 7 15369 with a constant specific to the expander. The constant is used to calculate the enthalpy of the fluid at the exit of this process, and takes into account internal frictional losses and other irreversibilities, which cause non-isentropic operation. The last step is to undergo a constant volume pressure rise or a constant enthalpy pressure drop, depending on the pressure ratio and the fluid. Finally the fluid mixes with the fluid, which has leaked internally to form state 2. Figure 2. Scroll expander thermodynamic model diagram. The leakage mass flow rate is calculated as follows [35]: m =ζP−P (1) v v Based on leakage flow rate, the mass flow rate exiting the expander is determined [35]: m =2×h−h (2) m h − h The coefficient used to calculate the exit conditions at the constant volume pressure building section is called the “isochoric pressure building coefficient” (Π). This is used to determine state 2v in Figure 2. The isochoric pressure building coefficient is defined as follows [36]: Π = h − h (3) h − h The next part of the model relates pressure forces with angular velocity and torque. The toque–pressure drop coefficient follows [36]: τ =k×Δp (4) = m (5) τ = τ − τ (6)PDF Image | Selection of Optimum Working Fluid for Organic Rankine Cycles
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