Mathematics – Logic
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..207e&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Mathematics
Logic
Scientific paper
To investigate rare and long lasting events on Venus such as seismicity or large scale atmospheric waves we need to use long lived lander ( LLL). There are meteorological and seismological instruments which survive at 500oC and 100 bar, but bottle neck is power supply and data acquisition system. Today we have no ready-made systems to fulfill this task. Lifetime of one venussian solar day (117 days) can be taken as start point for design of lightweight class lander .We propose basic LLL conception of two concentric rigid spheres with special high-temperature MLI in between and liquid water under ambient pressure inside as heat absorber. Thermal conductivity of MLI made of pure silver or gold foils in high vacuum is calculated. Thermodynamic effects of water: melting, heat capacitance in liquid phase , vaporization at 92 bar and 305 oC and superheating up to ambient temperature of 460oC are considered. In case of 0.4 m diameter and 40 kg water inside you are able to use common silicon electronics (200o C) for one month (even more if water was frozen before entry) and GaN (300oC) special electronics for more then three months after landing. Total mass will be 100 kg on surface and 150 kg before atmospheric entry. Our lightweight LLL conception is balanced and need not for dangerous and exotic components .
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