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The Crew Refrigerator/Freezer Racks (RFR) are being developed and built at Astrium Friedrichshafen under ESA contract. The RFR will provide conditioned storage volume for astronaut food during transport in the MPLM and on board the ISS. To support the design of the RFR a thermal model has been established at Astrium in the early project phase using the ESATAN software which is the ESA standard thermal analysis tool. This model has been extended to allow full operational simulation of the RFR during a typical mission scenario. For demonstrating the capabilities of EcosimPro, a state of the art tool to address Environmental Control and Life Support analysis, the same model is built up with EcosimPro. The results are validated by comparing them to those from the ESATAN simulation.

The Columbus Orbital Facility (COLUMBUS) is the main European contribution to the ISS. Its Temperature and Humidity Control (THC) subsystem consists of the Condensing Heat Exchanger and Filter Assembly (CHXFA), the Condensate Water Separator Assembly (CWSA) and the Cabin Temperature Control Unit (CTCU). The paper provides a description of the THC subsystem and its equipment focusing on the humidity removal function which has shown to be the major design challenge. Design solutions have been realised by optimising all equipment of the THC with respect to its system needs. Test results both on equipment and on THC subsystem level are presented demonstrating that the humidity removal performance is adequate to meet the system requirements in the wide operational range of COLUMBUS.