Overview of the International Space Station Multi-Purpose Logistics Module Active Thermal Control Subsystem Water Pump Package

Hamilton Standard’s subsidiaries, Microtecnica/Italy and Hamilton Standard Space Systems International/USA, have collaborated to design and fabricate a Water Pump Package (WPP) for the International Space Station (ISS) Multi-Purpose Logistics Module (MPLM). MPLM active payloads (Refrigerator/Freezer Racks (R/FR)) supply cold volume for food and scientific sample storage. The MPLM Active Thermal Control Subsystem (ATCS) maintains specific structural and equipment temperatures for the active payloads. The active thermal control is provided via a low temperature water loop whose flow rate is created by the WPP during MPLM pre-launch and MPLM pre-ISS attach and post-ISS detach mission phases. The WPP also provides compensation for water loop volume variations.

This paper will provide a detailed overview of the MPLM Water Pump Package design, as well as providing system performance data.