Trane International Patente

A climate control system for conditioning an interior space is described. The climate control system includes a chiller, an air handler and ducting. The climate control system additionally includes one or more controllers that are configured to set a first target for a performance metric for the airflow based on a desired climate parameter for the interior space. The one or more controllers of the climate control system further to set a second target for a heat transfer rate for the coil of the air handler based on the first target. In addition, the one or more controllers of the climate control system to adjust a flow rate of heat transfer fluid through the coil to reduce an error associated with the second target.

A method is described for operating a refrigerant circuit that includes a compressor with a driveshaft and one or more gas bearings for supporting the driveshaft. The method includes operating the refrigerant circuit in a first mode which includes supplying gaseous working fluid compressed by the compressor to the one or more gas bearings of the compressor, and the one or more gas bearings using the compressed gaseous working fluid to support the driveshaft. The method includes operating the refrigerant circuit in a second mode which includes supplying liquid working fluid to the one or more gas bearings of the compressor, and the one or more gas bearings using the liquid working fluid to support the driveshaft. A refrigerant circuit includes a compressor, a condenser, an expander, an evaporator, and a controller configured to selectively operate the refrigerant circuit in at least a first mode and a second mode.

A climate control system that includes a refrigerant compressor and a discharge line coupled to the refrigerant compressor is described. The climate control system further includes a muffler assembly in fluid communication with the discharge line. The muffler assembly can include an adjustable resonator that is in fluid communication with the discharge line, where the adjustable resonator has an adjustable internal volume. In addition, the climate control system includes a controller communicatively coupled to the adjustable resonator, wherein the controller is configured to adjust the adjustable internal volume of the adjustable resonator based at least in part on an operating speed of the refrigerant compressor to thereby attenuate a pressure pulsation in a flow of refrigerant emitted from the refrigerant compressor.

A climate control system that includes a refrigerant compressor (26) and a muffler assembly (100) in fluid communication with a discharge flow path coupled to the refrigerant compressor is described. The climate control system further includes that the muffler assembly is configured to attenuate pressure pulsations in a flow of refrigerant emitted from the refrigerant compressor. The muffler assembly includes a plurality of radial resonators (120,121,122), where each of the plurality of radial resonators defining a volume in fluid communication with the discharge flow path that extends radially outward from an inner diameter of the discharge flow path and circumferentially about a central axis of the discharge flow path.

An evaporator (100) is for a heating, ventilation, air conditioning, and refrigeration (HVACR) system and includes a shell (110) with an internal space (112), tubes (122) for a process fluid extending through the internal space, and a displacement array (130) disposed in the internal space. The displacement array includes baffles (140), demisters (160), and channels that extend through the displacement array. Each channel includes a demister portion and a baffle portion configured to discharge gaseous working fluid into the demister portion shaped to remove entrained liquid working fluid. A method for operating an evaporator includes directing working fluid into an internal space of a shell, and heating, with working fluid flowing though tubes, the working fluid within channels of a displacement array to generate gaseous working fluid. The method further includes directing gaseous working fluid from a baffle portion through a demister portion in each channel to remove entrained liquid working fluid.

A heating, ventilation, air conditioning, and refrigeration (HVACR) system includes a plurality of devices, and a controller. The controller is configured to generate an operation parameter based on an input, control the plurality of devices to operate based on the operation parameter when the operation parameter is outside of a predetermined operation region, and control the plurality of devices to operate based on a plurality of parameters differing from the operation parameter when the operation parameter is within the predetermined operation region.

A heating, ventilation, air conditioning, and refrigeration (HVACR) system includes a compressor, a condenser, a liquid-vapor separator having a vapor outlet and a liquid outlet, a cascade heat exchanger, an expander, and an evaporator fluidly connected. The system also includes a modulator disposed downstream of the liquid outlet, and a controller. The controller is configured to determine an operation parameter of the system, and to control the modulator to modulate a liquid flow from the liquid outlet based on the determined operation parameter. The expander is disposed downstream of the liquid outlet. The cascade heat exchanger is disposed downstream of the vapor outlet. The modulator is disposed between the liquid outlet and the vapor outlet and upstream of the cascade heat exchanger.

The ordering or staging of packaged units corresponding to an array thereof includes detecting environmental conditions proximate to the array, selecting a calculation for ordering the packaged units based on at least one of the detected environmental conditions, executing the selected calculation for each of the packaged units included in the array, and ranking the respective packaged units based on respective results of the executed calculation. The selected calculation for each of the respective packaged units factors an operational coefficient, a weighted value of a detected runtime, and at least one of a detected intake air temperature or a detected wind speed

A heating and cooling system including a first heat transfer circuit that includes a first heat exchanger and a second heat exchanger; a second heat transfer circuit that includes a third heat exchanger and a fourth heat exchanger; a coolant loop; and a controller. The controller selectively operates the heating and cooling system in: a heating mode, in which the heating and cooling system is configured to operate the first heat transfer circuit and the second heat transfer circuit in a cascaded operation to heat a first process fluid via heat transfer with the first heat exchanger, and a cooling mode, in which the heating and cooling system is configured to operate the first heat transfer circuit and the second heat transfer circuit in parallel operation to both provide cooling to a second process fluid via heat transfer with the fourth heat exchanger and the second heat exchanger.

A heating, ventilation, air conditioning, and refrigeration (HVACR) system includes a first heat transfer circuit; a second heat transfer circuit; a fluid loop between the first heat transfer circuit and the second heat transfer circuit; a heat exchanger connecting to the fluid loop; and a controller. The controller is configured to determine an operation parameter of the system; and control the heat exchanger to remove heat from the fluid loop when the operation parameter is above a first threshold.

A heating, ventilation, air conditioning, and refrigeration (HVACR) system includes a screw compressor, a condenser, and an evaporator fluidly connected; a suction pipe connecting the evaporator and the screw compressor; an actuator configured to modulate a first flow control device in the suction pipe; and a controller. The controller is configured to determine a discharge superheat of the screw compressor, and to control the actuator to modulate the first flow control device to increase the discharge superheat when the discharge superheat is below a first threshold.

An autocascade heat transfer fluid circuit includes an evaporator, a sub-cooler, a heat exchanger, a compressor, a condenser, a working fluid concentration sensor, a pressure sensor, a temperature sensor, and a unit controller. The unit controller converts properties of respective components of a working fluid flowing through the heat transfer fluid circuit; receive a temperature and pressure of the working fluid; convert the received properties, temperature, and pressure of the working fluid into concentration percentages for the respective components of the working fluid; determine a suction super heat of the working fluid based on the concentration percentages for the respective components of the working fluid; and control an expander to regulate a flow of the working fluid into an evaporator based on the determined suction super heat of the working fluid.

Centrifugal compressors can incorporate a side stream flow of intermediate pressure vapor between stages of that compressor. The side stream flow can be controlled by a side stream injection port controlled by a throttle ring disposed between stages of the compressor. The throttle ring can allow or obstruct flow through the side stream injection port. The throttle ring can extend and retract in a direction substantially perpendicular to the direction of flow from the first stage impeller to the second stage impeller. A method of operating a centrifugal compressor can include actuating a throttle ring by rotating a drive ring to adjust a flow of interstage fluid into the second stage impeller.

The present invention relates to a method for controlling a cooling system, the cooling system comprising: a mechanical cooling circuit and a free cooling circuit; the method comprising: receiving a temperature setpoint value indicative of a required temperature of the cooling load; receiving an ambient temperature value indicative of a temperature of the ambient fluid; calculating a difference between the temperature setpoint value and the ambient temperature value; determining whether to activate the mechanical cooling circuit and/or the free cooling circuit based on the calculated difference; and outputting a control signal to activate the mechanical cooling circuit and/or the free cooling circuit based on the determination.

A method for adjusting compression efficiency for an HVACR system having a variable-frequency drive (VFD) is disclosed. The method includes determining a first compression efficiency, determining an operating point, determining a region of an operating map when a difference between the operating point and a previously determined operating point exceeds a predetermined threshold, adjusting a VFD input to a first input based on the region of the operating map, and controlling the VFD using the first input for a predetermined period of time. The method also includes determining a second compression efficiency and an operation restriction, adjusting the VFD input to a second input based on the operation restriction and a difference between the first compression efficiency and the second compression efficiency, and controlling the VFD using the second input. The method also includes utilizing machine learning control techniques to control several system variables to optimize the compression efficiency.

Stabilization and drive linkages of a compressor capacity control valve are separated, for example physically and/or entirely, such that the respective linkages use separate and discrete attachment projections provided on the drive and throttle rings of the capacity control valve. The use of discrete attachment projections places lower stress on each attachment projection compared to linkages including paired stabilization and drive linkages sharing some attachment projections. The stabilization linkages can connect to an interstage casing. The linkage assemblies allow the throttle ring to be driven in an axial direction so as to open or close the compressor capacity control valve.

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This disclosure relates generally to cabinets for commercial heating, ventilation, air conditioning and refrigeration (HVACR) systems. More particularly, this disclosure relates to HVACR cabinets including one or more plenum fans located in a fan box. The fan box may be located between an indoor coil and a heat exchanger compartment of an HVACR unit. The fan box may be configured to direct air into a heat exchanger compartment inlet. The fan box may be parallel with or angled with respect to the indoor coil.

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