Plant operation energy exchange pump

The RO system consists of nine first-pass and three second-pass skids. The RO membranes are 20 cm spiral-wound TFC polyoxide type. The membrane pressure vessels have side-entry front/rear permeate ports. The high-pressure first-pass SWRO unit is supplied by a multi-pump system (three on-Hne, one on-standby). The SWRO feed pressure is 60 bar g TDH (total dehvery head). The second-pass RO unit treats the first-pass permeate and, therefore, operates at much lower feed pressure. The SWRO unit deploys dual work exchanger energy recovery devices. The plant is among the most energy efficient in the world, with an average efficiency of 3.58 kWh/m. The ERDs recover about 97% of the energy required to convert seawater to product permeate. 

The heat transport loop assembly uses a fluid to transport heat from the gas cooler to the radiator panels. This assembly consists of the loop ducts, fluid, pumps, accumulator, valves, trace heaters, insulation, and attachment and deployment hardware that connect these ducts to the boom and radiator panels. A loop flow path through the radiator panels is shown on Figure 9-57. The NRPCT prelimtnBfy plant ctmcept architecture has four independent loops, whictr d s not vary with the number of energy conversion components selected, with the exception of the 3-3-3 concept operating all Braytons at part load power capability, which has 3 loops. The Interface of the loops to the Brayton gas cooler heat exchanger(s) is presented in Section 9.3 with the failure combinations that viioutd lead to mission success or failure for vanous failure scenarios. 

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