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Two-Degree-of-Freedom Heater Control of a Loop Heat Pipe Based on Stationary Modeling

Gellrich, Thomas ORCID iD icon; Meinicke, Sebastian; Knipper, Paul; Hohmann, Sören; Wetzel, Thomas

Abstract (englisch):

Loop Heat Pipes (LHP) are widely used for thermal control in satellites. They separate heat supply and rejection spatially by establishing a capillary-driven cooling cycle featuring an evaporator (supply) and a condenser (rejection). By this, it is possible to transport heat over longer distances than with common heat pipes. Mass shifts in a LHP between the evaporator and the condenser depending on the heat load and the sink temperature are counterbalanced by a so-called compensation chamber (CC). By heating the CC it is possible to move the natural operating temperature of the LHP to a desired operating temperature while obtaining the needed heat conductance. It is common practice to improve the design of LHP components with stationary models. In this paper, a stationary model is developed to calculate the CC heater power gap between the natural stationary operating temperature curve and the desired operating temperature level. The quantified stationary CC heater power is then used in a two-degree-of-freedom PI control. It achieves a stable temperature control and an improved reaction to disturbances than commonly used PI controllers by separating the response to setpoint changes from the response to disturbances. ... mehr

Zugehörige Institution(en) am KIT Institut für Regelungs- und Steuerungssysteme (IRS)
Institut für Thermische Verfahrenstechnik (TVT)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2018
Sprache Englisch
Identifikator KITopen-ID: 1000088246
Erschienen in 48th International Conference on Environmental Systems (ICES-2018), Albuquerque, New Mexico, USA, 8-12 July, 2018
Externe Relationen Siehe auch
Schlagwörter loop heat pipe, control design, two-degree-of-freedom control, PI control, stationary modeling, experimental characterization
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