Download or read book An Evaluation of Shadow Shielding for Lunar System Waste Heat Rejection written by Cheyn Worn and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Shadow shielding is a novel and practical concept for waste heat rejection from lunar surface spacecraft systems. A shadow shield is a light shield that shades the radiator from parasitic thermal radiation emanating from the sun or lunar surface. Radiator size and mass can reduce if the radiator is not required to account for parasitic heat loads in addition to system energy rejection requirements. The lunar thermal environment can be very harsh towards radiative heat rejection. Parasitic heat loads force the radiator to expand in size and mass to compensate. On the Moon, there are three types: surface infrared, solar insulation, and albedo. This thesis tests shadow shielding geometry and its effect on the radiator and nuclear reactor in a reactor-powered Carnot heat engine. Due to the nature of cooling by radiative heat transfer, the maximum shaft work a Carnot system can produce and the minimal required radiator area occurs when the Carnot efficiency is 25%. First, a case for shadow shielding is made using an isothermal, control radiator model in Thermal Desktop. Six radiator temperatures and three latitudes are considered in the tests. Test variables in this section include radiator shapes and shade geometry. The simulations found that shadow shielding is best suited for a low-temperature radiator at the lunar equator. Optimized parabolic shade geometry includes a focus right above or at the top of the radiator and full to three-quarters shade height. The most useful rectangular radiator shape for shadow shielding is that which has a low height and long width. All simulations were conducted using a shade with a 10 kg/m2 area mass. A sensitivity study was conducted for different shade area masses using high and low values found in the literature. The shade is the most useful when the shade's area mass is less than or equal to that of the radiator. If the shade mass is below this threshold, the shade would be applicable to all radiator temperatures tested. Optimized shade and radiator geometry results were then factored into a second model where the radiator is comprised of heat pipes which is similar to radiators from actual system designs. Further simulations were conducted implementing the SAFE-4001 fast fission nuclear reactor design. The study found that shadow shielding allowed the system to use a low-temperature radiator where other configurations were not viable because shadow shielding drastically improves radiative heat transfer from the radiator, but at the consequence of raising radiator mass.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Control Systems for Low Temperature Heat Rejection on a Lunar Base written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-13 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the important issues in the lunar base architecture is the design of a Thermal Control System (TCS) to reject the low temperature heat from the base. The TCS ensures that the base and all components inside are maintained within the operating temperature range. A significant portion of the total mass of the TCS is due to the radiator. Shading the radiation from the sun and the hot lunar soil could decrease the radiator operating temperature significantly. Heat pumps have been in use for terrestrial applications. To optimize the mass of the heat pump augmented TCS, all promising options have to be evaluated and compared. Careful attention is given to optimizing system operating parameters, working fluids, and component masses. The systems are modeled for full load operation. Sridhar, K. R. and Gottmann, Matthias Unspecified Center NAG5-1572...
Download or read book Proceedings of the Intersociety Energy Conversion Engineering Conference written by and published by . This book was released on 1968 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1962 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lunar Sourcebook written by Grant Heiken and published by CUP Archive. This book was released on 1991-04-26 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only work to date to collect data gathered during the American and Soviet missions in an accessible and complete reference of current scientific and technical information about the Moon.
Download or read book Intersociety Energy Conversion Engineering Conference 1968 Record Papers written by and published by . This book was released on 1968 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Collection of Technical Papers written by and published by . This book was released on 1993 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Resources Energy power and transport written by and published by . This book was released on 1992 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of the British Interplanetary Society written by British Interplanetary Society and published by . This book was released on 1980 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bound with vol. 1- , 1934- , is the Society's annual report and list of members, 1934- .
Download or read book Energy for the Marketplace written by and published by . This book was released on 1983 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1969 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The 34th AIAA ASME ASCE AHS ASC Structures Structural Dynamics and Materials Conference Adaptive Structures Forum 93 1370 93 1445 written by and published by . This book was released on 1993 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Nuclear Propulsion for Human Mars Exploration written by National Academies of Sciences Engineering and Medicine and published by . This book was released on 2021-11-12 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Space Nuclear Propulsion for Human Mars Exploration identifies primary technical and programmatic challenges, merits, and risks for developing and demonstrating space nuclear propulsion technologies of interest to future exploration missions. This report presents key milestones and a top-level development and demonstration roadmap for performance nuclear thermal propulsion and nuclear electric propulsion systems and identifies missions that could be enabled by successful development of each technology.
Download or read book The Sun the Earth and Near earth Space written by John A. Eddy and published by Government Printing Office. This book was released on 2009 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: " ... Concise explanations and descriptions - easily read and readily understood - of what we know of the chain of events and processes that connect the Sun to the Earth, with special emphasis on space weather and Sun-Climate."--Dear Reader.
Download or read book The Sense of an Ending written by Julian Barnes and published by Vintage. This book was released on 2011-10-05 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: BOOKER PRIZE WINNER • NATIONAL BESTSELLER • A novel that follows a middle-aged man as he contends with a past he never much thought about—until his closest childhood friends return with a vengeance: one of them from the grave, another maddeningly present. A novel so compelling that it begs to be read in a single setting, The Sense of an Ending has the psychological and emotional depth and sophistication of Henry James at his best, and is a stunning achievement in Julian Barnes's oeuvre. Tony Webster thought he left his past behind as he built a life for himself, and his career has provided him with a secure retirement and an amicable relationship with his ex-wife and daughter, who now has a family of her own. But when he is presented with a mysterious legacy, he is forced to revise his estimation of his own nature and place in the world.
Download or read book Lunar Science A Post Apollo View written by Stuart Ross Taylor and published by Elsevier. This book was released on 2016-06-06 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lunar Science: A Post-Apollo View: Scientific Results and Insights from the Lunar Samples explains the scientific results and discoveries of the manned Apollo lunar missions as they are understood. The emphasis is less on sample description and data and more on the interpretative aspects of the study, with the aim of providing a coherent story of the evolution of the moon and its origin as revealed by the lunar samples and the Apollo missions. This text has seven chapters; the first of which provides a historical background of efforts to study the moon prior to the Apollo missions, including lunar photogeologic mapping and direct exploration by spacecraft. Attention then turns to the Apollo missions and the lunar samples collected, beginning with Apollo 11 that landed on the moon on July 20, 1969 and followed by more missions. The next chapter describes the geology of the moon, with emphasis on craters, central peaks and peak rings, the large ringed basins, rilles, and maria lava flows. The reader is also introduced to the nature of the lunar surface material, the maria basalts, the highlands, and the moon's interior. This book concludes with a discussion on the evidence that has been gathered by the Apollo missions that offers insights into the origin and evolution of the moon. An epilogue reflects on the usefulness of manned space flight. This book will appeal to lunar scientists as well as to those with an interest in astronomy and space exploration.
