Layout A proposed layout is shown on Fig. 12. This layout is shown because it is very efficient in water inventory. A wider radiator may be desirable in order to use longer tubes and such trade-off calculations are very valuable. It is in fact common terrestrial practice to make heat exchangers 20 ft long because the tubes come in 20 ft lengths. The convenience of fabrication out weighs any theoretical benefits of different lengths. Since the lunar tube factory would be constructed to make radiator tubes, any length can be considered. The key fabrication question may well be how long a pipe can be made and handled. If water is made from lunar oxygen then the water inventory question becomes moot. This may not occur because the water is required to operate the radiator before the large oxygen plant comes on line. However very little oxygen is required and it would be good engineering practice to build a small pilot facility first which would probably have enough capacity to fill the radiator.
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