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158 APPENDIX A TRNSYS Listing: Type 996 (APS ORC Power Cycle Model) Equation Chapter 1 Section 1 General Description Type 996 models the performance of a 1-MW organic Rankine cycle powerplant that uses n-pentane as the power cycle working fluid and Radco Industries XCELTHERM®600 as the solar field heat transfer fluid. Type 996 is a linear regression of a detailed power cycle model developed using EES [Klein, 2006]. A regression, rather than the detailed model is used because repeated solving of the detailed model would be computationally prohibitive in a simulation. A detailed description of the power plant as well as modeling techniques and validation are presented by McMahan [2006]. The EES files used to develop Type 996 are included with this thesis. This EES model can be used to recalculate the linear regression parameters allowing the consideration of varied plant operating parameters. Nomenclature a0-a9 b0-b9 m& H T F m& H T F , m a x m& H T F , m i n Net_Power Plant_Size T_WF_min T_HTF_in T_HTF_max T_HTF_min T_HTF_out = Linear regression coefficients for equation A.1 [-] = Linear regression coefficients for equation A.2 [-] = Heat transfer fluid mass flow rate [kg/s] = Maximum heat transfer fluid mass flow rate [kg/s] = Minimum heat transfer fluid mass flow rate [kg/s] = Net power produced by the power cycle [kW] = Capacity of plant being simulated (scaling factor for model) [kW] = Minimum power cycle working fluid temperature [C] = Heat transfer fluid power cycle inlet temperature [C] = Maximum heat transfer fluid power cycle inlet temperature [C] = Minimum heat transfer fluid power cycle inlet temperature [C] = Heat transfer fluid power cycle outlet temperature [C] Mathematical Description All outputs are correlated as functions of powerplant thermal boundary conditions: minimum working fluid temperature, heat transfer fluid inlet temperature and heat transfer fluid flow rate. The minimum working fluid temperature is specified by the user, either with arbitrary inputs or outputs from another component representing cooling system performance. This enables the incorporation of seasonal variation in cooling performance as well as the flexibility to consider a variety of cooling technologies and scenarios into simulations. The default minimum working fluid temperature is based on 250 kg/s of cooling water delivered at 20oC.PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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