Abstract: A flash gas bypass system includes a separation assembly having an inlet configured to receive a refrigerant flow from an expansion valve. A bypass conduit is coupled to a first port of the separation assembly and configured to receive a first portion of the refrigerant flow via the first port, where the first portion of the refrigerant flow includes flash gas. A second port of the separation assembly is coupled to an outlet conduit in fluid communication with an evaporator. The outlet conduit is configured to receive the second portion of the refrigerant flow via the second port and direct the second portion of the refrigerant flow toward the evaporator, where the second portion of the refrigerant flow includes liquid refrigerant. A filter is configured to redirect droplets captured by the filter from the first portion of the refrigerant flow into the second portion of the refrigerant flow.

Abstract: A method for performing extremum-seeking control of a plant includes determining multiple values of a correlation coefficient that relates a control input provided as an input to the plant to a performance variable that characterizes a performance of the plant in response to the control input. The performance variable includes a noise-free portion and an amount of noise. The method includes determining an adjusted correlation coefficient by scaling a first value of the correlation coefficient selected from the multiple values relative to a second value of the correlation coefficient selected from the multiple values. The adjusted correlation coefficient relates the noise-free portion of the performance variable to the control input. The method includes using the adjusted correlation coefficient to modulate the control input provided as an input to the plant.

Abstract: Disclosed herein are related to a system, a method, and a non-transitory computer readable storing instructions for operating an energy plant comprised of heating, ventilation and air conditioning (HVAC) devices. In one aspect, the system generates gradient data indicating a gradient of operating performance of the energy plant with respect to values of a plurality of control variables of HVAC devices. The system determines, from the plurality of control variables, a reduced group of control variables of the HVAC devices based on the gradient data. The system determines a set of values of the reduced group of control variables. The system operates the energy plant according to the determined set of values of the reduced group of control variables.

Abstract: Aspects of the present disclosure include a PIR assembly including a dome comprising a plurality of optical components, a stationary circuit board, and a moveable PIR sensor moveably coupled to the stationary circuit board via a flexible cable, wherein the moveable PIR sensor is configured to move to a first position to monitor a first zone via a first optical component of the plurality of optical components and to a second position to monitor a second zone via a second optical component of the plurality of optical components.

Abstract: A centrifugal compressor assembly is provided. The centrifugal compressor assembly includes a scroll assembly having a suction plate defining an inlet fluid passage, a suction plate housing, a diffuser plate, and a collector. The suction plate is detachably coupled to the suction plate housing, the suction plate housing is detachably coupled to the collector, and the diffuser plate is detachably coupled to the collector. The centrifugal compressor assembly further includes an impeller rotatably mounted in the scroll assembly for compressing fluid introduced through the inlet fluid passage, and a variable geometry diffuser system.

Abstract: Example implementations include a method, apparatus and computer-readable medium for managing security events via a graphical user interface (GUI), comprising receiving an indication of a first security event occurring in an environment, determining a priority value of the first security event, and creating a first identifier of the first security event, wherein the first identifier is a visual icon of a given shape. The implementations further include assigning a size and color to the first identifier of the first security event based on the priority value and generating, for display on the GUI, the first identifier of the first security event, wherein the GUI is configured to display identifiers of one or more security events in a selectable layout of a plurality of selectable layouts, wherein selection of the first identifier generates a panel of selectable actions that can be executed to address the first security event.

Abstract: A heating, ventilation, and/or air conditioning (HVAC) unit includes a drain pan configured to collect condensate generated by the HVAC unit. The HVAC unit also includes a drain spout having a rigid outlet port coupled to the drain pan and a flexible conduit coupled to the rigid outlet port. The drain spout is adjustable between a first configuration configured to discharge the condensate from the HVAC unit via a first opening of the HVAC unit and a second configuration configured to discharge the condensate from the HVAC unit via a second opening of the HVAC unit.

Abstract: The present disclosure relates to a heating, ventilation, and/or air conditioning (HVAC) system that includes a drain pan. The drain pan is configured to collect condensate into a basin of the drain pan from an evaporator of the HVAC system and to direct the condensate from the basin via a drain port of the drain pan. A draining surface is formed in the basin and includes a compound slope including a first slope extending along a length of the drain pan and a second slope extending along a width of the drain pan. A raised surface extends from the draining surface and includes protrusions extending from a spine that extends along a side of the drain pan. The raised surface is configured to support the evaporator of the HVAC system.

Abstract: A method for controlling equipment includes grouping a plurality of granular assets to form one or more general assets and generating models of the general assets based on the granular assets that form the general assets. Each model corresponds to a general asset and defines a relationship between resources produced by the general asset and resources consumed by the general asset. The method includes performing a first control process using the models of the general assets to determine a first allocation of resources among the general assets. The first allocation defines amounts of the resources to be consumed, produced, or stored by each of the general assets. The method includes operating the equipment to consume, produce, or store the resources in accordance with the first allocation.

Abstract: A noise suppression apparatus for an air handling unit includes an inlet section connectable to a fan of the air handling unit. The inlet section includes a forward wall spaced apart from an aft wall to define an internal chamber, and an inlet wall extending between the forward wall and the aft wall, the inlet wall defining an inlet air opening. A plurality of internal walls in the inlet wall define a plurality of resonator openings that each open to at least one of a plurality of resonator sections within the internal chamber. The plurality of resonator sections include at least one quarter wave tube section and at least one Helmholtz resonator section. One or more resonator sections are configured to attenuate noise generated by the fan at two or more frequencies. At least one resonator opening of the plurality of resonator openings opens to a plurality of resonator sections.

Abstract: A system for controlling building equipment devices includes a processing circuit comprising a processor and memory storing instructions executed by the processor. The system is configured to generate a first combination profile indicating a number of active devices within each of one or more device groups according to a first combination of the building equipment devices, and generate a second combination profile indicating a number of active devices within each of the one or more device groups according to a second combination of the building equipment devices. The system is also configured to compare the first combination profile against the second combination profile to determine whether the first combination is redundant with the second combination, generate control decisions for the building equipment devices based on whether the first combination is redundant with the second combination, and operate the building equipment devices in accordance with the control decisions.

Abstract: A variable refrigerant flow (VRF) system for a building includes an outdoor VRF unit, a plurality of indoor VRF units, a battery, and a predictive VRF controller. The outdoor VRF unit includes powered VRF components configured to apply heating or cooling to a refrigerant. The indoor VRF units are configured to use the heated or cooled refrigerant to provide heating or cooling to a plurality of building zones. The battery is configured to store electric energy and discharge the stored electric energy for use in powering the powered VRF components. The predictive VRF controller is configured to optimize a predictive cost function to determine an optimal amount of electric energy to purchase from an energy grid and an optimal amount of electric energy to store in the battery or discharge from the battery for use in powering the powered VRF components at each time step of an optimization period.

Abstract: A method for generating paths in a building space, the method including retrieving, by a processing circuit, a heatmap for the building space, generating, by the processing circuit, a plurality of vectors, the vectors defined by a first grid location and a second grid location of a plurality of grid locations, determining, by the processing circuit, a subset of vectors from the plurality of vectors based on a proximity of the plurality of vectors to a selected vector in the plurality of vectors, and combining, by the processing circuit, the subset of vectors to generate a merge location, wherein the merge location is used to adjust at least one of the first grid location or second grid location of at least one vector in the subset of vectors.

Abstract: A building risk analysis system including one or more memory devices storing instructions thereon, that, when executed by one or more processors, cause the one or more processors to receive threats, each of the threats including a location, wherein each of the threats are threats of a particular threat category, determine a number of threats for each of geographic areas based on the location of each of the threats, and generate a distribution based on the number of threats for each of the geographic areas. The instructions further cause the one or more processors to determine a risk score for each of the geographic areas based on one or more characteristics of the distribution and the number of threats for each of the geographic areas.

Abstract: The present disclosure relates to a building network system for a building. The system includes network devices forming a network for the building. Each of the network devices include a communications processing circuit including an access point configured to communicate with any of the network devices to form the network, and a second processing circuit removably communicably connected to the communications processing circuit. The communications processing circuit and the second processing circuit are configured to operate independently of each other. The access point is a wireless radio configured to wirelessly communicate with the access points of any of the network devices.

Abstract: A blower mounting assembly of a heating, ventilation, and/or air conditioning (HVAC) system includes a bracket assembly including a base panel, a plurality of mounting flanges extending from the base panel, and an alignment flange extending from and transverse to the base panel. The blower mounting assembly includes a first mounting aperture extending through the base panel in a first direction and includes second mounting apertures extending through the plurality of mounting flanges in a second direction transverse to the first direction. The blower mounting assembly includes a bolt configured to extend through and slidably engage with an aperture of the alignment flange and a blower mounting skid such that the bolt limits movement of the blower mounting skid relative to the bracket assembly. The aperture of the alignment flange extends through the alignment flange in a third direction transverse to the first mounting aperture and the second mounting apertures.

Abstract: Sensorized commercial buildings are a rich target for building a new class of applications that improve operational and energy efficiency of building operations that take into account human activities. Such applications, however, rarely experience widespread adoption due to the lack of a common descriptive schema that would enable porting these applications and systems to different buildings. Our demo presents Brick [4], a uniform schema for representing metadata in buildings. Our schema defines a concrete ontology for sensors, subsystems and relationships among them, which enables portable applications. Using a web application, we will demonstrate real buildings that have been mapped to the Brick schema, and show application queries that extracts relevant metadata from these buildings. The attendees would be able to create example buildings and write their own queries.

Abstract: A heating, ventilation, and/or air conditioning (HVAC) unit includes a housing having a base wall, a first electrical component coupled to the base wall, a panel movably coupled to the housing and configured to transition between a closed configuration that defines an air gap between the panel and the base wall and that blocks access to the first electrical component and an open configuration that enables access to the first electrical component, and a second electrical component coupled to the panel. The second electrical component is disposed on a side of the panel opposite the air gap in the closed configuration of the panel.

Abstract: A building cooling system includes one or more cooling devices operable to affect an indoor air temperature of a building and a system management circuit. The system management circuit is configured to obtain an objective function that includes a power consumption term and a comfort term, perform an optimization of the objective function over a time horizon to determine values of the cooling capacity of the cooling devices where each value of the cooling capacity corresponds to a time step of the time horizon, and control the cooling devices based on the values of the cooling capacity of the cooling devices. The comfort term of the objective function a difference between a prediction of the indoor air temperature of the building and a temperature setpoint for the building, while the power consumption term is a function of the power consumption of the one or more cooling devices.