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Noncondensible Gas, Mass, and Adverse Tilt Effects on the Start-up of Loop Heat Pipes
Technical Paper
1999-01-2048
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In recent years, loop heat pipe (LHP) technology has transitioned from a developmental technology to one that is flight ready. The LHP is considered to be more robust than capillary pumped loops (CPL) because the LHP does not require any preconditioning of the system prior to application of the heat load, nor does its performance become unstable in the presence of two-phase fluid in the core of the evaporator. However, both devices have a lower limit on input power: below a certain power, the system may not start properly. The LHP becomes especially susceptible to these low power start-ups following diode operation, intentional shut-down, or very cold conditions. These limits are affected by the presence of adverse tilt, mass on the evaporator, and noncondensible gas in the working fluid. Based on analytical modeling correlated to start-up test data, this paper will describe how the minimum power required to start the loop is increased due to the presence of mass, noncondensible gas, and adverse tilt. The end-product is a methodology for predicting a “safe start” design envelope for a given system and loop design.
Authors
Citation
Baumann, J., Cullimore, B., Yendler, B., and Buchan, E., "Noncondensible Gas, Mass, and Adverse Tilt Effects on the Start-up of Loop Heat Pipes," SAE Technical Paper 1999-01-2048, 1999, https://doi.org/10.4271/1999-01-2048.Also In
References
- Thermohydraulic Solution for Thermal Control, Propulsion,Fire Suppression, and Environmental Control Systems Cukkimore, Brent A; johnson, David A; 1999-01-2159 july 1999
- Heat Pipes Dunn, Reay
- A Method of Correlating Heat Transfer Data for Surface Boiling Liquids Rohsenow, W.M; Trans. ASME 74 969 1952
- Handbook of Heat Transfer Rohsenow, W.M; Hartnett, J.P; McGraw-hill 1973
- Start-Up Behavior of LHPs at Low Powers and with a Large Mass Attached to the Evaporator Bienert, Walter B; ICES 99ES-295 July 1999