Thermal modeling with solid/liquid phase change of the thermal energy storage experiment
A thermal model which simulates combined conduction and phase change characteristics of thermal energy storage (TES) materials is presented. Both the model and results are presented for the purpose of benchmarking the conduction and phase change capabilities of recently developed and unvalidated microgravity TES computer programs. Specifically, operation of TES-1 is simulated. A two-dimensional SINDA85 model of the TES experiment in cylindrical coordinates was constructed. The phase change model accounts for latent heat stored in, or released from, a node undergoing melting and freezing.
Thermal analysis of heat storage canisters for a solar dynamic, space power system
A thermal analysis was performed of a thermal energy storage canister of a type suggested for use in a solar receiver for an orbiting Brayton cycle power system. Energy storage for the eclipse portion of the cycle is provided by the latent heat of a eutectic mixture of LiF and CaF2 contained in the canister. The chief motivation for the study is the prediction of vapor void effects on temperature profiles and the identification of possible differences between ground test data and projected behavior in microgravity. The first phase of this study is based on a two-dimensional, cylindrical coordinates model using an interim procedure for describing void behavor in 1-g and microgravity. The thermal analysis includes the effects of solidification front behavior, conduction in liquid/solid salt and canister materials, void growth and shrinkage, radiant heat transfer across the void, and convection in the melt due to Marangoni-induced flow and, in 1-g, flow due to density gradients. A number of significant differences between 1-g and o-g behavior were found. This resulted from differences in void location relative to the maximum heat flux and a significantly smaller effective conductance in 0-g due to the absence of gravity-induced convection.
Nietzsche's Task: An Interpretation of Beyond Good and Evil
When Nictzsche published Beyond Good and Evil in 1886, he told a friend that it was a book that would not be read properly until "around the year 2000". Now Laurence Lampert sets out to fulfill this prophecy by providing a section by section interpretation of this philosophical masterpiece that emphasises its unity and depth as a comprehensive new doctrine on nature and humanity. According to Lampert, Nietzsche begins with a critique of philosophy that is ultimately affirmative, because it shows how philosophy can arrive at a defensible ontological account of the way of all beings. Nietzsche next argues that a new post-Christian religion can arise out of the affirmation of the world disclosed to philosophy. Then, turning to the implications of the new ontology for morality and politics, Nietzsche argues that these can be reconstituted on the fundamental insights of the new philosophy. Nietzsche's comprehensive depiction of this anti-Platonic philosophy ends with a chapter on nobility, in which he contends that what can now be publicly celebrated as noble in our species are its highest achievements of mind and spirit.