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Adaptive environment control system
| Details |
Inventors: Cler, Lawrence J.;
Assignee: American Telephone and Telegraph Company (New York, NY); AT&T Information Systems Inc. (Morristown, NJ)
Primary Examiner: Lall; Parshotam S.
Assistant Examiner: Mattson; Brian M.
Attorney, Agent or Firm: Volejnicek; David
This adaptive environment control system provides an HVAC control system that adapts to the continually-changing thermal characteristics of the building in which it operates. The adaptive environment control system periodically estimates the thermal characteristics of the building and uses these estimates to control the operation of the HVAC system. The adaptive environment control system also periodically measures the performance characteristics of the HVAC system to obtain data with which to update these thermal characteristic estimates. These thermal characteristic estimates enable the adaptive environment control system to determine both the length of time it takes the building to heat up and cool down when the HVAC system idles, as well as the amount of time it takes the HVAC system to heat or cool the building. These measurements and estimates are taken on a dynamic basis so that the adaptive environment control system responds to any changes in the environment, either within or without the building, including degradation of the operation of the HVAC system. The adaptive environment control system can calculate, through the estimates and measurements, the thermal performance of both the building and the HVAC system, so that the HVAC system is operational sufficiently early to maintain the building interior temperature within a predetermined range of the set-point threshold level of the thermostat. |
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DETAILED DESCRIPTION The adaptive environment control system of the present invention is illustrated in block diagram form in FIG.
1.
This system is located in a building 110 and consists of a number of control elements 102 to 105-n in conjunction with the building heating, ventilation, and air conditioning (HVAC) system 101.
The control elements consist of various sensor devices 105-l to 105-n, such as thermostats and humidity sensors.
Variable predictor 102 is connected to the various sensor devices 105-l to 105-n to obtain measurements of the building environment.
Variable predictor 102 provides output signals comprising estimates of the thermal characteristics of the building to control element 103.
Control element 103 is a processor which uses the data provided by variable predictor 102 to control the operation of HVAC System 101 to thereby regulate the environment throughout building 110.
Control element 103 also analyzes the data provided by variable predictor 102 to determine the operational efficiency of HVAC system 101.
A terminal 104 is provided so that control element 103 can provide human-readable output to maintenance personnel in building 110 to indicate the operational status of HVAC System 101 as well as data indicative of the environment in building 110 throughout the course of the day.
Terminal 104 also provides a user with a means to input data into the HVAC system, such as: times of building occupancy, setback temperature, occupied temperature, etc.
FIG.
1 also illustrates the thermal characteristic components associated with the operation of the subject adaptive environment control system.
In a building such as 110, the building itself absorbs energy from the surrounding interior environment, and that is illustrated on FIG.
1 as element M which illustrates the thermal mass of the building.
A second component in the thermal balance in building 110 is represented by arrow L which represents the thermal transfer through the exterior surfaces of the building to the surrounding environment
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