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The International Space Station (ISS) Internal Active Thermal Control System (IATCS) performance has been studied during the Hardware/Software Integration (HSI) Brassboard Development Testing. The ITCS Brassboard Development Test was built to verify the flight Thermal Control System performance and control. This paper describes the key results obtained with the flight like Pump Package Assembly, System Flow Control Assembly, Loop Cross-over Assembly, and Three Way Mixing Valve embedded in development hardware driven by flight software operated on a Functional Equivalent Unit Multiplexer-Demultiplexer (MDM).

This report will discuss the design methodologies used to date in the development of the US Laboratory Internal Thermal Control System (ITCS) and describe the role heuristics played during the design process over the past six years. From designing the baseline system to conducting Hardware/Software Integration (HSI), and Acceptance testing with flight software, this report will provide the reader with an understanding of how we achieved the system topology and command/control of ITCS.

A defined Active Thermal Control System (ATCS) Kit has been generated for the International Standard Payload rack (ISPR) in the U.S. Laboratory (U.S. Lab). This Kit, consisting of a Payload heat exchanger and set of coldplates, provides a mechanism to transport the heat load generated by the experiments to Internal Thermal Control System loops. This paper gives an overview of the ISPR Kit that will be available in the International Space Station Alpha (ISSA).