Space Cryogenic Systems Model and Capabilities

This paper describes the capabilities of a simplified modeling approach for end-to-end IR sensor cryogenics subsystems. It uses an Excel-based model that exercises a variety of thermal subsystem components including cryocoolers, ambient radiators, cryoradiators, flexible thermal links, and high-performance MLI. This model takes detector temperature and power dissipation inputs and outputs requirements for the supporting subsystems. The advantage of this approach is the ability to quickly respond to trade studies and configuration changes. Outputs of the model include radiator sizing, subsystem power requirements and cryocooler margins. Other advantages include ease of thermal model margin bookkeeping, (universal) software, and ease of comprehension.The need for this type of modeling approach is outlined below, followed by a model example referred to as the Case Study.