6 . 9 5 production in the residential and commercial settings. Motive use is considered 100% sensible. Process heat for both Industrial (including scientific) and other (farming, community services) categories is primarily sensible. A conservative estimate of 15% latent heat gain for these two areas is made. Therefore, the estimated latent electrical heat gain is .46 kW/person, yielding a total latent heat gain due to electrical appliances of 4.6xlo 5 watts for the colony. Table 6.8 compiles the total heat gains for the prototype colony from both solar radiation and electrical power consumption. Total latent heat gain is . 690xl0 7 watts, total sensible heat gain, 2.66xl0 7 watts. The sensible heat ratio is: Sensible Heat Ratio Sensible Heat Gain Total Heat Gain . 794 VI.10.4: Environmental Control Process: A diagram of the environmental control design process is presented in Figure 6.36. The flow of energy from input to the colony through separation into latent and sensible components precedes the choice of dehumidification method and the determination of the air flow scheme. A list of symbols used in the design process is presented in Table 6.9. Psychrometric charts are graphical representations of the relation between properties of moist air. The governing parameter of these charts is the total atmospheric pressure of the environment. A special chart for the 50% o 2 , 50% N 2 atmosphere with pressure of 5.88 psia was produced. Some pertinent data in the calculation of the chart is presented in Table 6.10. The chart is presented in Figure 6.37. The chart is the central tool in the design and sizing of the air conditioning system. Three methods of dehumidification are commonplace on Earth. Absorption uses a substance, solid or liquid, that has a high affinity for water. The substance removes water from air whenever the ambient pressure exceeds that of the water associated with the substance. Absorbents also act as odor filters. Their chief
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