The Kennedy Controls Corporation specializes in innovative solutions to complex business problems.
Computer Controlled Energy Management System.
Problem - What should the temperature be?
Second, what about weekends or school holidays? And perhaps more important, what about returning the temperature back to normal for special events or meetings held at night or weekends.
Third, since the outdoor temperature is always changing, doesn’t all of the above have to change to match the outdoor conditions – in other words, if it isn’t so cold (or windy) out on a given night could the setback period be longer than if it was colder? Of course, the answer to that one is yes – but how much longer could it have been?
Fourth, if the setback was for a longer period it could be ‘deeper’. For instance, consider the difference between an overnight setback and a weekend or holiday setback. If an overnight setback is too deep, the system may not be able to restore the room to the desired temperature on time. On the other hand, a deep setback can be used when the setback period is for several days, as the setback wouldn’t be ‘undone’ by the requirement of an early return that took a large percentage of the setback time.
All of the above is for one room. The thermal characteristics of a given room are unique to that room. Every other room in that building has a different set of characteristics based on its makeup, its location with respect to other rooms, the direction it faces, capability of the heating system in it, and a host of other factors.
As you can see, the optimization of any set back program is based on a number of conditions as explained above. . . but the most significant conditions are ones that have to do with the variability of the weather, or the ‘weather pressure’ on the building. Weather pressure as used here is a term used to identify a plurality of characteristics. The most obvious is the temperature outside. Another factor is the wind outside. Higher wind causes more effect on the building through both degradation of the stationary or boundary layer of air on the outside of the building and by increasing infiltration loss through increased leakage around doors, windows, ventilator openings, etc. A third factor is the effect of the sun on the building. There are other factors that play a role in weather pressure as well. The sophisticated data gathering and proprietary algorithms the computer executes in the KenTrol software plus the individual room KenTrol WatchDogs are required to resolve the complex mathematical problems and operate the system for maximum energy savings.
Kennedy Controls Corporation, P.O. Box 38 Taylorville, IL 62568
217-287-7231 (office) 217-287-7232 (fax)
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