Europa Clipper Thermal Control Valve Thermal and Hydraulic Analysis and Development Testing

Date

2019-07-07

Journal Title

Journal ISSN

Volume Title

Publisher

49th International Conference on Environmental Systems

Abstract

This manuscript describes the thermal and hydraulic analysis performed on Europa Clipper heat recovery system (HRS) thermal control valves as well as a radiation test to reduce risk of hardware failure during the mission. Europa Clipper is a solar powered mission to Jupiter where solar irradiance can be as low as 48 W/m2. The spacecraft also flies by Venus for gravity assist where the solar irradiance can reach 3300 W/m2. The spacecraft thermal design requires 1) the conservation of maximum amount of heat possible near Jupiter and 2) rejection of large amounts of heat during the Venus flyby. To achieve this, the HRS employs two JPL heritage thermal control valves in series to modulate flow to the radiator between 2.4 ml/min and 1.3 LPM. The thermal and hydraulic analysis were key in determining flow rate to the radiator as a function of fluid temperature in order to predict spacecraft temperatures. Hydraulic analysis was also performed to determine leak paths between the block redundant pairs of the thermal control valves. Finally, a development test was undertaken to determine the effects of ionizing radiation on the performance of the thermal control valve. The valve was exposed to a total ionizing dose of 300 krad, the maximum expected dose in the Clipper Vault. The flow characteristics of the valve was performed as a function of temperature before and after radiation exposure to determine ionizing radiation impact on valve performance.

Description

Razmig Kandilian, Jet Propulsion Laboratory (JPL), USA
Pradeep Bhandari, Jet Propulsion Laboratory (JPL), USA
Arthur Mastropietro, Jet Propulsion Laboratory (JPL), USA
Conan Zhang, Jet Propulsion Laboratory (JPL), USA
Brian Carroll, Jet Propulsion Laboratory (JPL), USA
ICES101: Spacecraft and Instrument Thermal Systems
The 49th International Conference on Environmental Systems as held in Boston, Massachusetts, USA on 07 July 2019 through 11 July 2019.

Keywords

Thermal control systems, thermal control valve, ionizing radiation, heat rejection system, hydraulic analysis, mechanically pumped fluid loop, single phase, Europa Clipper

Citation