Development of an Engineering Model of a monophasic Electro Hydro Dynamic (EHD) pumped fluid loop within the frame of the NEOSAT pre-development activities
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This publication presents the development of a novel pumped fluid loop thermal regulation system, completely free of moving parts. This technology is using electro hydro dynamic pumping of a dielectric coolant. This pumping mechanism gives unique advantages, e.g. regulated thermal conductivity and high reliability. In the framework of ESA “NEOSAT Phase B Pre-Development Activities”, APR Technologies has delivered an Engineering Model of a monophasic pumped fluid loop for a potential application on a satcom platform under development by TAS and ADS. The thermal regulation system is specified to a qualification operating temperature range between -20 to 70 °C with a thermal conductance between 0 and 3 W/K over a 0.5 m transport length and 1/8” tubing. EHD pumped fluid loop systems have a potential wide range of applications addressing • General heat removal from heat dissipating equipment and payloads. • Closed loop temperature control. For example temperature sensitive sensors. In comparison with heat pipes and thermal conduction, the EHD pumped loop system is particularly suited for thermal switching and temperature control applications. The fluid flow rate is directly controlled by the strength of the electrical field generating the EHD flow and on/off or analogue control schemes can be utilized. Although driven by externally applied electric field, the required energy input is low (0.3W) and much less than typical electrical motors used in mechanically pumped fluid loops. The EHD pump technology developed under this contract is furthermore scalable across a wide range of fluid flow rates, operating temperature ranges and mechanical envelopes. In comparison with heat pipes and Loop Heat Pipes, EHD pumped fluid loops are much less affected by gravitational field thus simplifying ground testing. In comparison with mechanically-pumped fluid loop, EHD pumped fluid loops have advantageously no moving mechanical parts.