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This paper details the analysis and design of the Temporary Sleep Station (TeSS) environmental control system for International Space Station (ISS). The TeSS will provide crewmembers with a private and personal space, to accommodate sleeping, donning and doffing of clothing, personal communication and performance of recreational activities. The need for privacy to accommodate these activities requires adequate ventilation inside the TeSS. This study considers whether temperature, carbon dioxide, and humidity remain within crew comfort and safety levels for various expected operating scenarios. Evaluation of these scenarios required the use and integration of various simulation codes. An approach was adapted for this study, whereby results from a particular code were integrated with other codes when necessary.

A small team of NASA engineers continues to work on development of the X-38 Experimental Crew Return Vehicle (CRV). The project has continued to take incremental steps, by building and conducting atmospheric flight tests on a series of increasingly-complex vehicles. The project culminates with fabrication and flight test of a space vehicle (designated as V-201), with a projected flight as a space shuttle payload in late 2000 or 2001. The emphasis for this paper will be to discuss the current status of the X-38 project, describe in further detail the vehicle-level requirements and design approach, discuss the Environmental Control and Life Support (ECLS) system-level requirements and design, recent system updates, and assembly and component-level details. Additionally, data will be presented from the most relevant analyses and tests which have been used to validate the system design and component selections