GRAPH #4 Graph #4 illustrates the relationship of the actual outside air temperature and the Energy Conservation Demand Signal. Graph #4 also illustrates the simultaneous relationship of the reset water temperatures for control from the Energy Conservation Demand Signal as well as control from actual outside air temperature. The sensing points for Graph #4 were obtained as shown on FIGURE #2. The Energy Conservation Demand Signal responds directly to the actual heating requirements of the coolest spot in the building while the outside air temperature sensor is oblivious to the building's needs and only reports the outside air temperature condition. During the afternoon of February 25, 1996 the actual outside air temperature was declining which would have increased the supply water temperature; however, the Energy Conservation Demand Signal was increasing because of the return of the body heat from the students to the classrooms. This caused the supply water temperature to be reduced to reflect the actual heating requirements of the building. In the morning of February 26, 1996 the Energy Conservation Demand Signal dropped to -152°F. The actual outside air temperature was only 10°F. The system is designed to believe the higher of the actual outside air temperature or the Energy Conservation Demand Signal; therefore, the supply water temperature was limited to the temperature which was the old outside air reset schedule desired. The reason the Energy Conservation Demand Signal dropped was that an unauthorized person had turned off the circuit breaker for the unitventilator. The room dropped in temperature, which caused the thermostat to demand full heat; however, the heat, which the thermostat was demanding from the building's primary supply system, was prevented from getting to the room because the room's fan was turned off. As you will see later in this report, this caused the other rooms on the same water supply to bring excessive amounts of fresh air into their unitventilators to attempt to compensate for the unwanted BTUs that escape from the coils. The result is a loss of comfort, a waste of energy and an increase in pollution from products of combustion while producing the unnecessary heat. 8.137
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