A condenser, an air conditioner outdoor unit, and an air-conditioning system. The condenser includes at least one row of heat exchange tubes and a plurality of fins arranged along the heat exchange tubes, where any fin is provided with at least one column of through holes, which correspond to the number of rows of the heat exchange tubes, for the heat exchange tubes to pass through; the fins are evenly divided, in the width direction, into at least one basic unit corresponding to the number of rows of the heat exchange tubes; the width of any basic unit is greater than 18.2 mm; and the center distance between two adjacent through holes from among any column of through holes is less than 21 mm. As a result, the heat exchange efficiency can be improved, and the energy efficiency can also be improved.

According to one embodiment, an air conditioner includes an outdoor unit including a control unit which controls an operation of a compressor, an expansion valve kit, at least one air-handling unit, and a controller. The control unit or the controller adjusts, when a parameter value indicating a change in temperature of air blown out of an indoor fan or a parameter value indicating a change in temperature of air sucked by the indoor fan is not within a range defined by a first threshold and a second threshold smaller than the first threshold, each of an opening degree of an indoor expansion valve and a change period of the opening degree or each of an operation frequency of the compressor and a change period of the operation frequency.

According to one embodiment, an air conditioner includes an outdoor unit including a control unit which controls an operation of a compressor, an expansion valve kit, at least one air-handling unit, and a controller. The control unit or the controller adjusts, when a parameter value indicating a change in temperature of air blown out of an indoor fan or a parameter value indicating a change in temperature of air sucked by the indoor fan is not within a range defined by a first threshold and a second threshold smaller than the first threshold, each of an opening degree of an indoor expansion valve and a change period of the opening degree or each of an operation frequency of the compressor and a change period of the operation frequency.

Internal control devices (41A to 41D) included respectively in air conditioners (10A to 10D) in an air conditioning system (1) are communicably connected one by one correspondingly to external control devices (42A to 42D). Each of the external control devices (42A to 42D) is configured to execute command generating operation of generating an operation command to a corresponding one of the air conditioners (10A to 10D). The external control devices (42A to 42D) constitute an external control system (50). In the external control system (50), one of the external control devices (42A) functions as a master control device configured to execute the command generating operation whereas remaining ones of the external control devices (42A to 42D) other than the external control device (42A) functioning as the master control device function as sub control devices configured not to execute the command generating operation.

Internal control devices (41A to 41D) included respectively in air conditioners (10A to 10D) in an air conditioning system (1) are communicably connected one by one correspondingly to external control devices (42A to 42D). Each of the external control devices (42A to 42D) is configured to execute command generating operation of generating an operation command to a corresponding one of the air conditioners (10A to 10D). The external control devices (42A to 42D) constitute an external control system (50). In the external control system (50), one of the external control devices (42A) functions as a master control device configured to execute the command generating operation whereas remaining ones of the external control devices (42A to 42D) other than the external control device (42A) functioning as the master control device function as sub control devices configured not to execute the command generating operation.

An adiabatic cooling system includes a condenser coil and one or more adiabatic pads positioned such that intake air for the adiabatic cooling system passes through the pads prior to contacting the condenser coil. The adiabatic cooling system includes a vibration device attached to each adiabatic pad. A controller is communicatively coupled to the vibration device for each of the adiabatic pads. The controller determines that cleaning of the adiabatic pads is needed. In response to detecting cleaning is needed, the controller causes the vibration device attached to each adiabatic pad to vibrate, thereby causing debris in the one or more adiabatic pads to become loosened and/or removed from the adiabatic pads.

A rotor includes a rotor core having an outer circumference extending in a circumferential direction about an axis and having magnet insertion holes, and permanent magnets disposed in the magnet insertion holes. The permanent magnet constitutes a magnet magnetic pole, and a part of the rotor core constitutes a virtual magnetic pole. The width of the virtual magnetic pole in the circumferential direction is narrower than the width of the permanent magnet in the circumferential direction. The rotor core has at least one slit at the virtual magnetic pole.

A heater assembly for a heating, ventilation, and/or air conditioning (HVAC) system has a heater and a controller enclosure. The heater has a plurality of heating elements in a frame that has two opposing ends. The controller enclosure has two end walls and a plurality of side walls in a non-rectangular polygonal configuration. One of the two opposing ends of the frame is coupled to one of the two end walls such that an orientation of the heating elements may be changed based on respective locations of the plurality of side walls of the controller enclosure.

A heater assembly for a heating, ventilation, and/or air conditioning (HVAC) system has a heater and a controller enclosure. The heater has a plurality of heating elements in a frame that has two opposing ends. The controller enclosure has two end walls and a plurality of side walls in a non-rectangular polygonal configuration. One of the two opposing ends of the frame is coupled to one of the two end walls such that an orientation of the heating elements may be changed based on respective locations of the plurality of side walls of the controller enclosure.

A housing assembly includes a panel having a plurality of sub-panels including a first sub-panel and at least one second sub-panel, the first sub-panel being fitted with an electric control box of an air-conditioner outdoor for shielding the electric control box. According to the housing assembly provided in the present disclosure, when an electric control box is to be maintained, only the first sub-panel is removed to expose the electric control box, without removing two panels to expose the electric control box, thereby reducing the difficulty of electric control maintenance and improving the convenience of electric control maintenance.