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Auxiliary equipment: Other cycle components simulated in the code are the pumps for water circulation and reinjection. Numerical simulation model: P5 model requires the following design parameters or equipment performance factors to identify a steady-state operating point: Pinch point temperature for all heat exchangers Waste heat source mass flow rate, temperature, specific heat Component pressure drops Pump, expander, generator efficiencies Coolant supply specific heat, temperature & temperature rise Finite size thermodynamics: The objective of the finite size thermodynamics optimization is to determine the operating conditions which minimise the total UA/net power output (where UA is the product of the overall heat transfer coefficient and the surface area) of the two heat exchangers. This parameter is directly related to the heat exchangers’ surfaces and is often used to give a global idea of their dimensions. Program Execution: The pressure and temperature changes are calculated using pressure-drop and heat- transfer correlations, which involve thermodynamic properties of the refrigerant. The circulating mass flow rate was determined by heat balance. The pump and expander exit were calculated based on two steps firstly, calculation of the isentropic expansion end point then, calculation of the real expansion end point. The water cooled condenser model predicts the condensing pressure, given the inlet coolant temperature, pinch point and assumed temperature rise. It must be emphasized that feed pump & expander pressure changes influence the outlet stream temperature. In the case of the expander temperature decrease, it is associated with isentropic expansion. The pump always increases the temperature while operating in the power cycle. For the pump, the temperature change is small compared to the expander but it is not neglected in the analysis. 43PDF Image | study of ORC with the expansion process twin screw machines
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