GRAPH #3 The black line illustrates the mixed air temperature, the blue line illustrates the discharge air temperature and the green line illustrates the return air relative humidity. The graph three shows almost an inverse situation from graph one. On graph three the mixed air temperature rises significantly while the discharge experiences only a small drop in temperature when the humidity sprays are active. This graph illustrates the more effective use of energy where the system automatically uses heat contained in the return air to provide the energy required to evaporate the moisture for humidification demands. Prior to the control change the humidity circuit forced the heating equipment in the building to provide the heat to compensate for the evaporization. GENERAL The evaporative cooling has to be compensated for with heat or the space will become too cold. The heat can come from: 1. the mechanical heating system as illustrated in graph one at great expense and pollution generation from extra combustion, or 2. the return air where the heat is already paid for, which saves money and reduces pollution by reducing combustion. The discharge air temperature could have the drop in temperature eliminated completely by automatically resetting the discharge controllers set point as required, but the range of control experienced with the sprays active and inactive was well within the acceptable limits. 8.100
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