The Early External Active Thermal Control System (EEATCS) is used to perform the cooling of the US Laboratory (USL) during early assembly stages of the International Space Station (ISS) to support assured early research (AER). It will provide the ability to transport the thermal load generated by the USL to space by thermal radiation via two photovoltaic radiators (PVR). The EEATCS can be described as an indirect heat rejection system composed of two ammonia loops. Each loop contains accumulators, radiators, a heat exchanger, piping and an independent pump flow control subassembly (PFCS). The PFCS contains the flow control valve (FCV), which controls the radiator bypass flow in each loop. Performance modeling of the EEATCS was accomplished to identify its capabilities under a low-Earth orbit space environment for different flight modes, orbit beta angles and vehicle torque equilibrium attitudes (TEA). The model geometry was based on finite element models developed on Master Series that were generated from CATIA Initial Graphics Exchange Specification (IGES) files. A translator program was used to convert the model to a Thermal Radiation Analyzer System (TRASYS) input deck. TRASYS was then used to determine the thermal radiation space environment. The FCV control logic was based on an algorithm developed on EASY5, and the Systems improved Numerical Differencing Analyzer and Fluid Integrator (SINDA/FLUINT) program was used to model and perform the analysis. Analytical checks were derived to help baseline the results. The analysis presented a high degree of understanding of the EEATCS capabilities.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Performance modeling of the Early External Active Thermal Control System for the International Space Station


    Contributors:


    Publication date :

    1997


    Size :

    5 Seiten, 3 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Early External Active Thermal Control for the International Space Station

    Delgado, Adon / Gombos, Frank / Hajela, Gyan et al. | SAE Technical Papers | 1996




    Thermal Analysis of International Space Station Freeze-Tolerant Early External Active Thermal Control System Radiators

    Andish, K. K. / Chen, I. Y. / University of New Mexico | British Library Conference Proceedings | 2000