Horizontal Radiator with Active Horizontal Sunshield In equatorial regions the sunscreen must be modified to be horizontal and some 50 m above the radiator (five times the radiator width). The sunshield has a solar reflector coating on top and a black underside to prevent reflection from the lunar soil. Active pointing is needed to maintain the radiator in shadow at all times without an excessively large sunscreen, because the larger the sunscreen the worse the radiator performance. The radiating power is 395 W/m2 and the nighttime temperature is 296 K for a 10 m wide radiator and a 10 m wide sunscreen at 50 m elevation. Active pointing could be accomplished by slinging the sunscreen between four poles and controlling the location and angle with pulleys. It should be noted that perfect shadowing is not required in the early morning or late evening when the soil temperature is lower. Radiation Analysis The approach taken in analysis is the network technique of Edwards [7]. Figure 4 shows the radiation diagrams and networks derived from them for two of the radiator
RkJQdWJsaXNoZXIy MTU5NjU0Mg==