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The NASA-wide CEV Smart Buyer Team (SBT) was assembled in January 2006 and was tasked with the development of a NASA in-house design for the CEV Crew Module (CM), Service Module (SM), and Launch Abort System (LAS). This effort drew upon over 250 engineers from all of the 10 NASA Centers. In 6 weeks, this in-house design was developed. The Thermal Systems Team was responsible for the definition of the active and passive design architecture. The SBT effort for Thermal Systems can be best characterized as a design architecting activity. Proof-of-concepts were assessed through system-level trade studies and analyses using simplified modeling. This nimble design approach permitted definition of a point design and assessing its design robustness in a timely fashion. This paper will describe the architecting process and present trade studies and proposed thermal designs

The Hubble Space Telescope (HST) was launched in 1990 and has undergone several Servicing Missions that have replaced and repaired various scientific and support hardware. As preparations begin for Servicing Mission Four (SM4) in 2008 and the life extension activities that follow, the Telescope Thermal Math Model (TMM) has been improved using the latest thermal analysis software and techniques. Several efforts have been made to improve the HST system-level TMM since launch. A brief history of the major model updates, as well as the motivation behind the changes has been provided. The current improvements have provided the HST systems-level TMM a greater level of detail, while making model control more user-friendly and the results easier to verify. Several modeling techniques useful for spacecraft thermal design and operations support are discussed.

Having been in operation for over 15 years, the Hubble Space Telescope (HST) had experienced significant changes in both hardware upgrades and operational modes. The changes were necessary to improve performance of some equipment and to replace failed electronics in others. Hardware replacements were done in several servicing missions. To accommodate the change in physical condition of HST, alterations in the way the telescope is operated were also required. The final opportunity to make any hardware changes on HST is during Servicing Mission 4 (SM-4) which is currently scheduled for December of 2007. It is important to make the most appropriate changes in order to ensure that HST will be in good operating condition until its planned termination. In order to provide manifest input to the HST project for the final servicing mission, the HST thermal team must conduct careful evaluation of every single piece of hardware on HST.