GRAPH #5 Graph #5 illustrates the difference in the supply water temperature, comparing control when the reset system was allowed to sense the Energy Conservation Demand Signal to reset based on only the actual outside air temperature. The change of reference points was done at noon on March 4, 1996. The sensing points for Graph #5 were obtained as shown on FIGURE #2. If you look back at Graph #1 and Graph #2 to compare them to Graph #5 you will see that the relationship of the supply water up to noon on March 4, 1996 is similar to Graph #2 which graphed resetting from the Energy Conservation Demand Signal. After noon on March 4, 1996 on Graph #5 the relationship is similar to Graph #1 which graphed resetting from actual outside air temperature. The coldest room demand signal reflected the impact of the body heat of the students up to noon March 4, 1996. The system required cooling while the students were in the classrooms during the day, but the signal dropped at night when the effect of the student body heat was gone to stop the cooling and only use heating. After noon on March 4, 1996 the coldest room signal increased to bring in cooling to compensate for the heat which was being forced into the system by the main supply water temperature increase. The unitventilator in the coldest room required more cooling at night, when the students' body heat was not present, than the room did when the classroom was full of students. The increased cooling required is the result of heat escaping into the unitventilator. NOTE: Graphs 1, 2, 3, 4 and 5 were all developed to illustrate the method and need for controlling the supply water temperature based on the Energy Conservation Demand Signal which is created by the coldest room. This signal activates the main heating supply after the coldest room has opened its heating device to receive the requested heat. The information for these charts was obtained from signals in the boiler room at the main steam heat exchangers for the supply water. 8.139
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