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Development of an integrated design resolution plan for the International Space Station active internal thermal control system coolant stability concerns

机译:开发国际空间站积极内部热控制系统冷却稳定性问题的综合设计解决方案

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The International Space Station (ISS) Internal Active Thermal Control System (ITCS) for the United States Laboratory (USL), and follow-on pressurized elements, uses a mechanically-pumped fluid in closed-loop circuits. The ITCS utilizes a specifically formulated heat transfer fluid (essentially de-ionized water with special additives). Silver ions are specified in the formulation to assist in the control of microorganisms. The potential for microorganisms to form biofilms known to cause heat transport, corrosion problems, and subsequent hardware deterioration has raised concerns among the ISS engineering community. This paper provides the integrated design resolution to: 1) ensure the coolant meets the required fluid specification; 2) obtain long-term "fleet leader" data; 3) allow sampling of the ITCS coolant on-orbit; 4) return the coolant to the ground for complete chemical analyses including microbial parts count; and 5) add silver ions to the coolant stream(s) for on-orbit microbial growth control.
机译:国际空间站(ISS)内部主动热控制系统(ITCS)为美国实验室(USL),以及后续加压元件,采用机械泵流体在闭环线路。的ITCS利用专门配制的传热流体(具有特殊的添加剂基本上去离子水)。银离子在制剂中指定的,以协助在微生物的控制。为微生物已知会导致热传输,腐蚀问题,以及后续硬件恶化形成生物膜的可能性已经提高了ISS工程界的担忧。本文提供了集成设计分辨率:1)确保冷却剂符合要求的流体规范; 2)获得长久的“队领导者”的数据; 3)允许在轨的ITCS冷却剂的采样; 4)冷却剂返回到地面,以完整的化学分析包括微生物零件计数;和5)添加的银离子到冷却剂流(一个或多个),用于在轨微生物生长的控制。

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