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APPENDIX C TRNSYS Listing: Type 998 (Indirect Storage Heat Exchanger and Dispatch) Equation Chapter 1 Section 1 General Description Type 998 models a heat exchanger designed to couple a thermal storage system to a solar-thermal powerplant. In addition to heat exchanger calculations, it provides two basic control strategies that interface a storage system with a power cycle and solar field. Figure C.1 shows the anticipated component configuration: Figure C.1: sample simulation configuration using Type 998as the solar field – storage coupling heat exchanger and controller. The heat exchanger is modeled using an effectiveness-NTU technique. Based on one known flow rate (generally on the solar field side) Type 998 calculates the mass flow rate of the storage system fluid such that the capacitance rates are as closely matched as possible. Matched capacitance rates are chosen in order to maximize heat exchanger (and storage system) performance and minimize required fluid flow rates. Nomenclature HTF_Fluid m& i n , b o t t o m m& i n , s t o r e , b o t m& i n , s t o r e , t o p m& i n , t o p m& out ,bottom m& o u t , s t o r e , b o t = integer representing power-cycle side fluid [-] = mass flow input from the power cycle [kg/s] = mass flow input from the bottom of the storage tank [kg/s] = mass flow input from the top of the storage tank [kg/s] = mass flow input from the solar field [kg/s] = mass flow output to the solar field [kg/s] = mass flow output to the bottom of the storage tank [kg/s] 175PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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