6.109 The power needed for environmental control, Pthermal' is the sum of cons~~ptions by air and refrigerant handling equipment: Pthermal = Pfan + Ppump .375xl0 7 watts These additional heat generating devices are configured such that their load is directly wasted through the hull and no additional environmental load is placed on the conditioning equipment. Thus, by transferring the entire heat gain to a refrigerant and cooling this refrigerant by passive radiation, the air conditioning system achieves Earth-normal conditions within the colony. The condensed water is part of the closed water cycle, and serves as a supply for agriculture and inhabitants. The large number of air handling units provides flexibility to adjust for temperature changes and variations in power input to the colony. The electrical power requirement for environmental control raises the operations and lifestyle requirement by 67%: P = (5.6xl0 6 ) + (3.75xl0 6 ) inputelectrical 9.35xl0 6 watts VI.11: FOOD PRODUCTION AND WASTE RECYCLING VI.11.1: Summary: The space colony must provide food for its inhabitants independent of supply from Earth. There has never been an attempt to reproduce a completely controlled, closed, healthy ecological system. At LS, there is no place for "loose ends" in any of many biological cycles to be absorbed. Any imbalance in the lifestyle of the prototype would have significant effects on the well-being of the colonists. A thorough study of the prototype's ecology and its many parameters is needed. This study addresses portions of the problem. The nutritional requirements of the colony's population are set and their implications on food production are explored. A number of options are
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