Organic Rankine Cycle Solar-Thermal Powerplants

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Organic Rankine Cycle Solar-Thermal Powerplants ( organic-rankine-cycle-solar-thermal-powerplants )

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168 through [B.15] is a fixed value (idle_timestep). idle_timestep should be a multiple of the TRNSYS time step to minimize error. Storage size calculations Shown below are the calculations involved in determining system simulation parameters based on the user-specified storage capacity. The required tank volume is calculated based on the design temperature difference and storage capacity as: Vtank = StorageSize (1−ε)ρsCs(Thot_design −Tcold_design)+ερf (hf T_hot_design −hf T_cold_design) The tank height is then calculated based on the specified tank diameter: H = 4Vtank tank π ⋅TankDiameter2 Tank top, bottom and wall surface area are then calculated: Aw =π⋅TankDiameter⋅Htank [B.16] [B.17] [B.18] [B.19] A ,A = top bot π ⋅TankDiameter2 4 Systems Integration information The Storage_Mode parameter determines how Type 994 will interact with all balance-of- system TRNSYS components. The three available storage modes are: Storage_Mode 1 Direct 2 Indirect 3 Control System Bypass In direct mode the storage system is should be directly connected to the solar field for charging and the power cycle for discharging. It is important in this mode to ensure that Type 994 is using the same fluid as other TRNSYS components. In direct mode the dispatch and control strategies are administered directly from Type 994 (details follow). Storage mode 2 (indirect) is designed to interface with Type 998. Type 998 models the heat exchanger that interfaces the solar field and power cycle heat transfer fluid loops. In Storage mode 2 the control strategies are administered from Type 998. See Type 998 documentation for further details. The OUTPUT_CODE output of Type 994 is used to signal tank status to Type 998 (or other TRNSYS types). The OUTPUT_CODE is defined such that: OUTPUT_CODE

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