Date: 02-22-82 Classification: u Keywords: thermal control, materials and coatings Abstract: Low mass high performance radiators and thermal management systems need to be developed for advanced space systems. The key to these new/improved thermal systems are high performance heat pipes. One aspect in achieving low mass/high performance heat pipes requires working fluids compatible with low ATTACHMENT : mass materials of construction, such as aluminum, magnesium, beryllium and titanium. The application of heat pipe systems in manned spacecraft also requires the use of low or non-toxic working fluids. The development of new or improved heat pipe fluid/vessel combinations for advanced space systems should be carried out. Two approaches worthy of investigation are: the synthesis of new high performance fluids compatible with appropriate envelope materials and the development of integral impervious coatings and/or passivation to prevent the reaction of currently acceptable working fluids with the envelope. Title: Enhanced heat pipe theory and operation Source: Proceedings of the AFOSR Special Conference on Prime-Power for High Energy Space Systems, Norfolk, Virginia, USA, Feb. 22-25, 1982. (Paper No. X-5) Authors: Ernst, D. M.; Eastman, G. Y.; <Thermacore, Inc.> Date: 02-22-82 Classification: u Keywords: thermal control, nuclear Abstract: Heat pipes to extract heat from the cores of compact fast reactors require unusually high power densities. This performance appears to be feasible, but necessitates more detailed exploration of theoretical and operational limits than has been carried out to date. Closely aligned to heat ATTACHMENT : pipes for heat removal from the core are the low mass high performance, high temperature radiator heat pipes. Much of the work concerning the theory and operational limits of high performance heat pipes has been hit or miss, distorted by funding limits or specific mission requirements. To reach the levels of performance required by large space power systems, the work must be unified, a fully descriptive analytical model developed and the analyses experimentally verified. The areas requiring the greatest attention are the startup and shutdown characteristics of long heat pipes, the limits on wick-augmented thin film evaporation (burn out heat flux) and the prediction of the true temperature profile along the heat pipe. It will also almost certainly require exploration and analysis of higher capacity capillary wicks than have been demonstrated to date. Title: Two-phase heat transport for thermal control Source: Proceedings of the AFOSR Special Conference on Prime-Power for High Energy Space Systems, Norfolk, Virginia, USA, Feb. 22-25, 1982. (Paper No. X-6) Authors: <Arthur D. Little, Inc., Cambridge, Mass. 02140> Date: 02-22-82 Classification: u Keywords: thermal control Abstract: The thermal control of future orbiting payloads will require the transfer of tens of kilowatts of thermal power over tens of meters with small driving temperature differences. To help meet these needs, a pumped, two-phase
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