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BuildingAutoInterF2
flashcard vocab
| Term | Definition |
|---|---|
| low-priority load | A load that is shed first for electrical demand control. |
| control point | A variable in a control system. |
| control strategy | A method for optimizing the control of building system equipment. |
| shed table | A table that prioritizes the order in which electrical loads are turned OFF. |
| high-priority load | A load that is important to the operation of a building and is shed last when demand goes up. |
| duty cycling control | A supervisory control strategy that reduces electrical demand by turning OFF certain HVAC loads temporarily. |
| optimum start control | A supervisory control strategy in which the HVAC load is turned ON as late as possible to achieve the indoor environment setpoints by the beginning of |
| averaging control | A control strategy that calculates an average value from multiple inputs, which is then used in control decisions. |
| temporary scheduling | The programming of time-based control functions for a one-time temporary schedule. |
| thermal recovery coefficient | The ratio of a temperature change to the length of time it takes to obtain that change. |
| electrical demand control | A supervisory control strategy designed to reduce a building's overall electrical demand. |
| optimum stop control | A supervisory control strategy in which the HVAC load is turned OFF as early as possible to maintain the proper building space temperature until the end |
| hunting | An oscillation of output resulting from feedback that changes from positive to negative. |
| adaptive start time control | A process that adjusts the actual start time for HVAC equipment based on the building temperature responses from previous days. |
| permanent holiday | A holiday that remains on the same date each year. |
| Offset | The difference between the value of a control point and its corresponding setpoint. |
| data trending | The recording of past building equipment operating information. |
| transient holiday | A holiday that changes its date each year. |
| predictive maintenance | The monitoring of wear conditions and equipment characteristics in comparison to a predetermined tolerance to predict possible malfunctions or |
| proportional control algorithm | A control algorithm in which the output is in direct response to the amount of offset in the system. |
| holiday and vacation scheduling | The programming of time-based control functions during holidays and vacations. |
| schedule linking | The association of loads within the building automation system that are always used during the same time. |
| algorithm | A sequence of instructions for producing the optimal result to a problem. |
| supervisory control strategy | A method for controlling certain overall functions of a building automation system. |
| derivative control algorithm | A control algorithm in which the output is determined by the instantaneous rate of change of a variable. |
| feedback | The measurement of the results of a control action by a sensor. |
| high/low signal select | A control strategy in which the building automation system selects the highest or lowest values from among multiple inputs for use in the control |
| estimation start time control | A process that calculates the actual start time for HVAC equipment based on building temperature data and a thermal recovery coefficient. |
| shed load | An electric load that has been turned OFF for electrical demand control |
| scheduled control | A supervisory control strategy in which the date and time are used to determine the desired operation of a load or system. |
| rotating priority load shedding | An electrical demand control strategy in which the order of loads to be shed is changed with each high electrical demand condition. |
| alternate scheduling | The programming of more than one unique time schedule per year. |
| alarm setpoint | The control point value that should trigger an alarm. |
| lead/lag control | A control strategy that alternates the operation of two or more similar pieces of equipment in the same system. |
| integral control algorithm | A control algorithm in which the output is determined by the sum of the offset over time. |
| calibration | The adjustment of control algorithm parameters to the optimal values for the desired control response. |
| open-loop control system | A control system in which decisions are made based only on the current state of the system and a model of how it should work. |
| high-limit control | A control strategy that makes system adjustments necessary to maintain a control point below a certain value. |
| reset control | A control strategy in which a primary setpoint is adjusted automatically as another value (the reset variable) changes. |
| derivative control algorithm | A control algorithm in which the output is determined by the instantaneous rate of change of a variable. |
| adaptive control algorithm | A control algorithm that automatically adjusts its response time based on environmental conditions. |
| control logic | The portion of controller software that produces the necessary outputs based on the inputs. |
| alarming | The detection and notification of abnormal building conditions |
| restored load | A shed load that has been turned ON after electrical demand control. |
| life safety control | A supervisory control strategy for life safety issues such as fire detection and suppression. |
| closed-loop control system | A control system in which the result of an output is fed back into a controller as an input. |
| control loop | The continuous repetition of the control logic decisions. |
| timed override | A control function in which occupants temporarily change a zone from an UNOCCUPIED to OCCUPIED state. |
| setpoint control | A control strategy that maintains a setpoint in the system. |
| setpoint | The desired value to be maintained by a system. |
| setback | The unoccupied heating or cooling setpoint. |
| Offset | The difference between the value of a control point and its corresponding setpoint. |
| low-limit control | A control strategy that makes system adjustments necessary to maintain a control point above a certain value. |
Created by:
Sabrilstar