Abstract: The disclosed technology includes systems and methods for controlling an air conditioning system. The method of controlling the air conditioning system can include receiving air temperature data from an air temperature sensor and determining that the air conditioning system should operate in a reheat mode based on the air temperature being less than a threshold air temperature. The method can include outputting a control signal to a first electronic expansion valve to close and thereby prevent refrigerant to flow through an outdoor condenser coil. The method can also include outputting a control signal to a second electronic expansion valve to open and thereby permit refrigerant to flow through a reheat coil.

Abstract: In one embodiment, an overflow sensor assembly of an HVAC unit includes a sensor mounting bracket that is configured to be coupled to a mounting surface of the HVAC unit such that sensor probes of the overflow sensor assembly are suspended within and extend into a condensate drain pan of the HVAC unit. The sensor probes are defined by a sensor element that is coupled to the sensor mounting bracket and a spring that is coupled to the sensor element. The sensor probes are configured to activate an overflow detection circuit when the sensor probes come in contact with condensate fluid collected in the condensate drain pan prior to the condensate fluid overflowing from the condensate drain pan.

Abstract: The disclosed technology includes devices and systems for an economizer of a heating ventilation and air conditioning (HVAC) system. The disclosed technology can include an economizer for an HVAC system comprising a housing, an air inlet extending through a wall of the housing, a sliding door configured to transition between a closed position and an open position, and a controller configured to cause the sliding door to transition between the closed position and the open position based on temperature data. The sliding door can comprise a first portion forming a barrier and a second portion comprising at least one aperture. In the closed position, the first portion can align with the air inlet and substantially prevent ambient air from moving through the air inlet. In the open position, the second portion can align with the air inlet and permit the ambient air to move through the air inlet.

Abstract: The disclosed technology includes devices, systems, and methods for a battery-integrated heat pump system. The disclosed technology can include a heat pump system having an indoor heat exchanger coil, an outdoor heat exchanger coil, and a compressor. The disclosed technology can further include a third heat exchanger coil, a battery, and a pump configured to circulate a fluid through the third heat exchanger coil and the battery. The disclosed technology can be configured to manage the temperature of the battery by operating the pump to facilitate heat transfer between the refrigerant and the fluid to heat or cool the battery.

Abstract: The disclosed technology includes devices, systems, and methods for a battery-integrated heat pump system. The disclosed technology can include a heat pump system having a battery, a compressor, and a variable speed drive in electrical communication with the battery and the compressor. The variable speed drive can be configured to control a speed of the compressor. The heat pump system can include a fan that can be configured to move air across a heat exchanger coil of the heat pump system and the battery can be located in an airflow path of the fan such that the fan can also move air across the battery to regulate a temperature of the battery.

Abstract: An interlaced heat exchanger is described. The interlaced heat exchanger includes a plurality of microchannel tubes configured to allow flow of a first fluid therethrough and a plurality of flat tubes configured to allow flow of a second fluid therethrough to exchange heat with the first fluid. The plurality of microchannel tubes and the plurality of flat tubes are stacked in an alternating arrangement along a longitudinal axis of the interlaced heat exchanger such that the plurality of microchannel tubes and the plurality of flat tubes are interlaced. The interlaced heat exchanger further includes a plurality of fin plates interspersed with the plurality of microchannel tubes and the plurality of flat tubes. The plurality of fin plates allows a flow of air across a width of the interlaced heat exchanger to exchange heat with at least one of the first fluid and the second fluid.

Abstract: The disclosed technology includes a method for identifying and determining a fault or a potential fault in an air system having an outdoor unit and an indoor unit in fluid communication via a refrigerant circuit. The method can include receiving, from a sensor, vibration data indicative of one or more sounds or vibrations detected by at least a portion of the refrigerant circuit. The method can include identifying, based at least in part on the vibration data and stored baseline vibration data, an abnormality in the vibration data. The abnormality can be indicated by vibration data indicative of a frequency that is outside a range of acceptable frequencies. The method can include analyzing the identified abnormality according to a predetermined set of evaluation factors to determine the fault or the potential fault.

Abstract: An air mover system for use in an indoor unit of a heating, ventilation, and air conditioning (HVAC) system includes a blower comprising a motor and a blower control unit configured to control operations of the motor. The blower control unit includes a controller and a sensor communicably coupled to the controller. The sensor is configured to sense air inside the indoor unit and to provide sensor information to the controller. The controller is configured to determine whether a refrigerant is present in the air based on the sensor information and to control the blower to move the air out of the indoor unit in response to determining that the refrigerant is present in the air.

Abstract: Systems and methods for pressure expanding a tube to fit a heat exchanger fin are disclosed. The systems can include one or more pressure relief devices, and each pressure relief device can be configured to release at least some pressurized fluid via a respective auxiliary flow path in response to a pressure of the pressurized fluid being greater than a predetermined pressure relief threshold.

Abstract: A heat pump system including a charge compensator having a liquid line port for an inflow of a refrigerant into the charge compensator and for an outflow of the refrigerant from the charge compensator. The heat pump system further includes an isolation valve configured to control flows of the refrigerant to and from the charge compensator through a liquid line piping of the heat pump system based on whether the heat pump system is operating in a cooling mode, a defrost mode, or a heating mode, where the liquid line port is fluidly coupled to the liquid line piping of the heat pump system.

Abstract: Methods for expanding a tube to create a tight fit or an interference fit with one or more fins for the manufacture of a heat exchanger are disclosed. The methods can include providing an internal pressure to the tubes in a successive pulsing manner with each pulse having a short duration. The methods can include creating a temperature differential between the bend sections of the tubes and the straight sections of the tubes such that the bend section has a lower temperature than the straight sections. The methods can include creating an external pressure differential between the bend sections of the tubes and the straight sections of the tubes such that the external pressure acting on the bend sections is greater than the external pressure acting on the straight sections.

Abstract: Systems and methods for pressure expanding a tube to fit a heat exchanger fin are disclosed. The systems can include one or more pressure relief devices, and each pressure relief device can be configured to release at least some pressurized fluid via a respective auxiliary flow path in response to a pressure of the pressurized fluid being greater than a predetermined pressure relief threshold.

Abstract: The disclosed technology includes systems and methods for controlling an air conditioning system. The method of controlling the air conditioning system can include receiving air temperature data from an air temperature sensor and determining that the air conditioning system should operate in a reheat mode based on the air temperature being less than a threshold air temperature. The method can include outputting a control signal to a first electronic expansion valve to close and thereby prevent refrigerant to flow through an outdoor condenser coil. The method can also include outputting a control signal to a second electronic expansion valve to open and thereby permit refrigerant to flow through a reheat coil.

Abstract: The disclosed technology includes an integrated system including a space conditioning system, a liquid heating system, and a controller. The space conditioning system can include a refrigerant circuit fluidly connecting a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, an expansion valve, and a reversing valve such that refrigerant can flow through the circuit. The liquid heating system can include a liquid heating device and a liquid circuit configured to direct liquid from the liquid heating device through the first heat exchanger. The controller can be in electrical communication with the space conditioning system and the liquid heating system. The controller can be configured to determine a demand of the space conditioning system and the liquid heating system, and in response, output instructions to a plurality of valves to direct the refrigerant through the refrigerant circuit and direct the liquid through the liquid circuit.

Abstract: Systems and methods for pressure expanding a tube to fit a heat exchanger fin are disclosed. The systems can include one or more pressure relief devices, and each pressure relief device can be configured to release at least some pressurized fluid via a respective auxiliary flow path in response to a pressure of the pressurized fluid being greater than a predetermined pressure relief threshold.

Abstract: Methods for expanding a tube to create a tight fit or an interference fit with one or more fins for the manufacture of a heat exchanger are disclosed. The methods can include providing an internal pressure to the tubes in a successive pulsing manner with each pulse having a short duration. The methods can include creating a temperature differential between the bend sections of the tubes and the straight sections of the tubes such that the bend section has a lower temperature than the straight sections. The methods can include creating an external pressure differential between the bend sections of the tubes and the straight sections of the tubes such that the external pressure acting on the bend sections is greater than the external pressure acting on the straight sections.

Abstract: Systems and methods for improved heat exchange performance are disclosed. The system can include a first slab of refrigerant tubes having an upstream side and a downstream side. The system can further include a second slab of refrigerant tubes having an upstream side and a downstream side. The system can additionally include an airflow distribution device configured to distribute air along the first and second slabs. Further, the downstream side of first slab can be set apart a first distance from the downstream side of the second slab and the upstream side of the first slab can be attached to the upstream side of the second slab. The airflow distribution device can include a perforated plate having perforations of various dimensions or various sized vanes positioned in the path of airflow.

Abstract: Systems and methods for improved heating, ventilation, air conditioning, and refrigeration systems incorporating a plurality of refrigerant circuits. The system can include a compressor having a first compression chamber, a second compression chamber, and a motor. The system can further include a heat exchanger having a first set of microchannel coils and a second set of microchannel coils. The system can have a first circuit fluidly coupled between the first compression chamber and the first set of microchannel coils and a second circuit fluidly coupled between the second compression chamber and the second set of microchannel coils. Further, the first circuit comprises a first refrigerant and the second circuit comprises a second refrigerant.

Abstract: The disclosed technology includes a variable refrigerant flow (VRF) conditioning system including a single outdoor unit and a VRF path extending between the single outdoor unit and a plurality of terminals. The plurality of terminals can include a first terminal configured to condition air of an interior room and a second terminal configured to heat or cool a liquid. The VRF system can provide heating or cooling of air in different rooms or zones within a building or home while also providing heating or cooling of water. In response to a demand for heating or cooling at each terminal, the VRF system can vary the supply of refrigerant to each terminal, such that efficient and precise temperature regulation of air and liquid can be provided.

Abstract: A heat pump system including a charge compensator having a liquid line port for an inflow of a refrigerant into the charge compensator and for an outflow of the refrigerant from the charge compensator. The heat pump system further includes an isolation valve configured to control flows of the refrigerant to and from the charge compensator through a liquid line piping of the heat pump system based on whether the heat pump system is operating in a cooling mode, a defrost mode, or a heating mode, where the liquid line port is fluidly coupled to the liquid line piping of the heat pump system.