A manned spacecraft capsule has a shape of a cylinder 2.5 m in diameter and 9 m
Question:
A manned spacecraft capsule has a shape of a cylinder 2.5 m in diameter and 9 m long. The air inside the capsule is maintained at 20?C and the convection-heat-transfer coefficient on the interior surface is 17 W/(m2 K). Between the outer skin and the inner surface is a 15 cm layer of glass-wool insulation having a thermal conductivity of 0.017 W/(m K). If the emissivity of the skin is 0.05 and there is no aerodynamic heating or irradiation from astronomical bodies, calculate the total heat transfer rate into space at 0 K.GIVENA glass-wool insulated cylinder in space filled with airDiameter (D) = 2.5 cmLength (L) = 9 mAir temperature (Ta) = 20?C = 293 KInterior convective heat transfer coefficient (hc) = 17 W/(m2 K)Insulation thickness (t) = 15 cm = 0.15 mThermal conductivity of insulation (k) = 0.017 W/(m K)Emissivity of the skin (ε) = 0.05No aerodynamic heating or irradiation from astronomical bodiesASSUMPTIONSSteady stateThermal resistance of the capsule walls is negligible compared to that of theinsulation
Step by Step Answer:
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn