6.104 saturation point at approximately 53°F (285°K). Cooling coils typically process air to about 95% Relative Humidity. Therefore, a convenient point C, Figure 6.38, is chosen to fall on the environmental gain line and exhibit 95% RH. Point C = [55°F DB, 54°F WB, 95% RH, W = .022, h = 37] The entire latent heat load must be extracted by the dehumidification process. The sensible load can be so extracted, but may also be dispersed passively through the hull. The capability of the hull to waste heat is taken as a variable. Whatever sensible heat load remains after the latent load is satisfied is assumed wasted through the double hull. Moisture is uniformly distributed in the colony atmosphere. The air flow rate necessary to maintain steady-state condition is proportional to the rate of sensible heat gain, 2.66xl0 7 watts. Figure 6.40 shows the schematic cooling coil process. The equations describe the relation of different states for the required steady flow energy and material balances. Table 6.11 lists the values of the variables mentioned. The mass of air is determined by dividing the air flow volume by the specific volume at the design state. The air flow rate, CFM, for any cooling process is related to the sensible heat gain by this formula: CFM = Sensible Heat/hr x {Unit Conversion Factor) {pair) {Cpair) {lit) The volume flow rate is then related to mass flow rate Ma: Ma = CFM/V Q can then be determined by equation (4) of Figure 6.40, and the amount of water removed by equation (3) of Figure 6.40. These calculations are presented in Table 6.12. Note that the removal of the latent heat load also satisfies the entire sensible heat load.
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