GRAPH #1 This graph uses the black line to illustrate the mixed air temperature, which was averaging about fifty-nine degrees Fahrenheit. The mixed air temperature was not affected by the status of humidity sprays; therefore, it remained relatively constant. The blue line illustrates the discharge air temperature. When the humidity sprays were not active the discharge air temperature averaged about sixty-three degrees Fahrenheit. When the humidity sprays were active the discharge air temperature averaged about fifty-three degrees Fahrenheit. The green line illustrates the return air relative humidity. This line indicates the run times for the humidity spray pump. The energy loss is demonstrated by the dips in the discharge air temperature (blue line). At these times the heating system has to contend with a heating load approximately ten Fahrenheit degrees cooler than if the building did not have a humidification capability. A control strategy was developed to allow the discharge air temperature controller to over-ride the mixed air controller to raise the mixed air temperature automatically when the humidity sprays were active. This was intended to keep the discharge air temperature relatively stable and remove the large dips in the discharge air temperature created by the spray activation. This would save energy and reduce the complaints of cold drafts by the occupants. The discharge air controller also retained its control over the fan system's chilled water valve for mechanical cooling. 8.96
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