Abstract: A controller for heating, ventilation, or air conditioning (HVAC) equipment includes a communications interface configured to communicate with first HVAC equipment and second HVAC equipment and a processing circuit communicably coupled to the communications interface. The processing circuit is configured to detect a staging event for the first HVAC equipment occurring at a first time, obtain a delay time based on an estimated amount of time required to reach steady state after the staging event for the first HVAC equipment occurs at the first time, determine whether the delay time has elapsed since the staging event for the first HVAC equipment has occurred, and prevent the second HVAC equipment from staging in response to a determination that the delay time has not elapsed since the staging event for the first HVAC equipment has occurred.

Abstract: An assembly includes a thermoelectric tripping device, a flange, and a gland. The thermoelectric tripping device is configured to be detachably coupled with a damper. The thermoelectric tripping device includes an extending arm including a fuse configured to trip at a pre-defined temperature. The flange is configured to be coupled to a surface of the damper. The gland is defined by a pair of fixtures positioned in-line with each other and having a passage configured therewithin to facilitate passage of the extending arm therethrough. A first fixture of the pair of fixtures is configured to be coupled with the flange, and a second fixture of the pair of fixtures is configured to be detachably coupled with the extending arm.

Abstract: Example implementations include a method, apparatus, and computer-readable medium comprising determining, by a processor of a control panel, that a security event has happened, wherein the security event is associated with a user identification or authentication; capturing one or more still images or videos by at least one camera in the control panel subsequent and in response to determining that the security event has happened; and using the one or more still images or videos to perform facial recognition.

Abstract: Example implementations include a method, apparatus and computer-readable medium for estimating a real world distance in an image, comprising obtaining an image from a camera installed in an environment and identifying, in the image, a first set of parallel lines on a real world ground plane and a second set of parallel lines on the real world ground plane. The implementations include determining a first intersection point of the first set of parallel lines and a second intersection point of the second set of parallel lines, identifying a ground line connecting the first intersection point and the second intersection point, and estimating an internal camera matrix based on a focal length and an image size associated with the camera. The implementations include calibrating the camera for real world distance measurement by determining a perpendicular vector to the ground line based on the internal camera matrix.

Abstract: Example implementations include a method, apparatus, and computer-readable medium comprising capturing visual or audio data using at least one camera or microphone in a control panel; performing, by a processor of the control panel, at least one of a voice recognition or a facial recognition, based on the visual or audio data captured by the at least one camera or microphone in the control panel; recognizing an individual according to at least one of the voice recognition or the facial recognition; and presenting, on a display of the control panel, a graphical user interface that includes features associated with the individual.

Abstract: A frequency response optimization system includes a battery, a power inverter, and a frequency response controller. The battery is configured to store and discharge electric power. The power inverter is configured to control an amount of the electric power stored or discharged from the battery. The frequency response controller includes a high level controller configured to determine values of clipping parameters and a low level controller configured to use the values of the clipping parameters to modify battery power setpoints. The power inverter is configured to use the modified battery power setpoints to control the amount of the electric power stored or discharged from the battery.

Abstract: A predictive controller for a building energy system obtains a function that defines an amount of energy consumed by both waterside equipment and airside equipment during a time period as a summation of multiple equipment-specific energy components including a waterside energy component indicating an amount of energy consumed by the waterside equipment during the time period and an airside energy component indicating an amount of energy consumed by the airside equipment during the time period. The predictive controller performs a predictive control process using the function to determine values of the equipment-specific energy components during the time period. The predictive control process includes predicting the amount of energy consumed by both the waterside equipment and the airside equipment during the time period based on the values of the equipment-specific energy components.

Abstract: One or more message brokers configured to communicate over a message bus and provide one or more features and the one or more features are executed in response to a field in a first message communicated to a message broker of the one or more message brokers. The operations also include creating a second set of the one or more message brokers in a second set of isolated compute environments. The second set of the one or more message brokers capable of performing an additional feature in addition to the one or more features. The communications over the message bus include sending a structured data format. The second set of one or more message brokers are configured to execute extension instructions related to the additional feature in response to a second message containing a specified field in the structured data format. The second set of one or more message brokers are deployed to the message bus while the first set of one or more message brokers communicates over the message bus.

Abstract: Example implementations include a method, apparatus and computer-readable medium for generating deployment capabilities of a device, comprising generating a machine-readable optical label that is specific to the device during manufacturing, wherein the device is a new device that is to be added to a network comprising a plurality of devices. The implementations further include configuring a firmware of the device to create a web server that provides a webpage, wherein the webpage includes a user interface that receives and provides configuration information. Additionally, the implementations further include linking the machine-readable optical label to the webpage such that when the machine-readable optical label is scanned by a different device, the webpage is generated on the different device.

Abstract: A heat exchanger for a heating, ventilation, and/or air conditioning (HVAC) system includes a header having a longitudinal axis, a first plurality of microchannel tubes coupled to the header, where each microchannel tube of the first plurality of microchannel tubes has a first width, and a second plurality of microchannel tubes coupled to the header, where each microchannel tube of the second plurality of microchannel tubes has a second width greater than the first width.

Abstract: A method for automatically programming a security system including a plurality of access control readers and a plurality of image sensors includes receiving user credential information from a first access control reader. A first door associated with the first access control reader is further associated with a first image sensor. A user is identified based on the user credential information and based on visual content provided by the first image sensor. Upon receiving the user credential information from one or more access control readers of the plurality of access control readers different from the first access control reader, the user is reidentified based on visual content provided by the plurality of the image sensors. The image sensor that provided the visual content used for reidentification of the user is associated with a door associated with the access control reader that provided the user credential information.

Abstract: Example implementations include a method, apparatus, and computer-readable medium comprising first broadcasting, by at least one primary speaker of a control panel, a first sound toward a front or a side of the control panel; and second broadcasting, concurrently with the first broadcasting, by a removable back speaker that is removably attachable to a back side of the control panel, a second sound toward the back side of the control panel. In some aspects, the removable back speaker is configured as a stand for placing the control panel on a flat surface.

Abstract: A building management system (BMS) includes one or more memory devices having instructions stored thereon. When executed by one or more processors, the instructions cause the processors to perform operations including ingesting semantic information associated with a plurality of BMS objects, classifying the plurality of BMS objects into a plurality of predetermined classifications that pertain to the plurality of BMS objects using the semantic information, updating a semantic site model for a building site by including at least one of the semantic information associated with the plurality of BMS objects or the plurality of predetermined classifications that pertain to the plurality of BMS objects, and adjusting a plurality of parameters associated with the plurality of BMS objects using the semantic site model.

Abstract: Disclosed is a refrigeration system, comprising refrigeration system components, a connecting pipeline, a switch structure, and discharging channels (123, 124; 623, 624). The refrigeration system components comprise three heat exchangers (101; 102; 112). The refrigeration system components can be connected via the connecting pipeline, and are combined into different working systems via the switch structure. When two heat exchangers are selected by the switch structure to form one working system and the saturation temperature corresponding to the internal pressure of the unselected heat exchanger is higher than the medium or environment temperature of the heat exchanger, a liquid refrigerant accumulates inside the non-working heat exchanger.

Abstract: A system for predicting the vulnerability of a building management system (BMS) includes one or more memory devices configured to store instructions that, when executed on one or more processors, cause the one or more processors to establish a first communication link to a first data source and receive a first data using a communication module communicatively coupled to the processor. The first data includes information related to at least one of a plurality of IoT-enabled devices. The system is further configured to generate a historical record composed of a plurality of received data feeds received from a plurality of data feeds at unanticipated time intervals and analyze at least one of the plurality of data feeds with at least one or more of: the first data, the historical record, and another of the plurality of data feeds to predict the vulnerability of the BMS.

Abstract: A compressor includes a diffuser passage configured to receive refrigerant flow from an impeller of the compressor, where the diffuser passage is at least partially defined by a compressor discharge plate of the compressor. The compressor also includes a variable geometry diffuser positioned within the diffuser passage and configured to adjust a dimension of a refrigerant flow path through the diffuser passage, an actuator coupled to the variable geometry diffuser and configured to adjust a position of the variable geometry diffuser within the diffuser passage, and a controller configured to regulate operation of the actuator.

Abstract: An access control system includes an identification unit having an infrared (IR) transmitter, an IR detector that receives reflected IR radiation from one or more body parts of the user, one or more signal processing components to determine a temperature of the user, a hand sanitization unit that sanitizes hands of the user when the hands are placed in a palm placement area, and an identification device to receive identification information of the user. The access control system also includes a processor that receives the reading of the user, instructs a door lock controller to unlock a door when the temperature is below the threshold temperature or the temperature is within the temperature range. The processor sends an alert when the temperature is above the threshold temperature or the temperature is outside the temperature range, and sends identification information of the user to one or more network devices.

Abstract: A controller for an HVAC system includes processing circuitry configured to perform a volumetric offset control (VOC) scheme based on a flowrate offset setpoint to operate a valve to drive an actual flowrate offset between a supply rate of air entering a space and an exhaust rate of air leaving the space toward the flowrate offset setpoint. In some embodiments, the valve is configured to control the supply rate of air entering the space or the exhaust rate of air leaving the space and to provide sensor data indicating a flowrate therethrough. In some embodiments, the processing circuitry is configured to monitor a pressure of the space to detect a pressure condition and update the flowrate offset setpoint in response to detecting the pressure condition. In some embodiments, the processing circuitry is configured to perform the VOC scheme based on the updated offset flowrate setpoint.

Abstract: A student tracking system deploys distributed sensors throughout a school building. The distributed sensors receive identification information broadcast by user devices carried by occupants of the school such as students, teachers and school administrators. The student tracking system tracks the location of the occupants within the building based on which sensors most recently detected the user devices. The system sends the location information for the occupants to tracking devices operated by tracking users such as school administrators, emergency responders and/or parents. The tracking devices also present to the parents image data captured by surveillance cameras depicting the students. Additionally, the distributed sensors detect the presence of unauthorized individuals within the school building by determining whether an individual detected via a proximity or motion detector corresponds to identification information for a registered user device received by the sensors.

Abstract: A valve assembly, includes a valve body having an inlet portion, an outlet portion, and a constriction portion; a shaft positioned within the valve body and extending along a longitudinal axis of the valve body; a cone provided within the inlet portion and configured to move along the shaft; a spring configured to bias the cone away from the constriction and positioned between a first piston fixed to the cone and a second piston fixed to the shaft; and an adjustable spacer positioned between a fixed position on the shaft and the second piston. The adjustable spacer is adjustable in length to change an effective length of the adjustable spacer and change a position of the second piston on the shaft.