Johnson Controls Technology Company

York International Corporation

Johnson Controls Tyco IP Holdings Llp

Johnson Controls Building Efficiency Technology (wuxi) Company

Johnson Controls Builsing Efficiency Technology (wuxi) Company, Ltd.

Mark Robinson Bodell, Ii

Curtis Christian Crane

Xiuping Su

Wanda Jean Miller

Shenglong Wang

John C Hansen

Dean K Norbeck

Justin Patrick Kauffman

Andrew Michael Welch

Robert E Stabley

Shimin Sheng

Curtis G Rager

Hongming Hu

Wanda J Miller

Russell Mark Thompson

Dennis L Deitz, Jr

A chiller includes an evaporator, a compressor including a prime mover, a first pressure sensor that detects a first pressure in the evaporator, a second pressure sensor that detects a second pressure in a condenser, and a controller. The controller determines a predicted energy level of the compressor based on the first pressure and the second pressure, the predicted energy level associated with liquid droplet flow into the compressor, compares the predicted energy level to an operating energy level, and modifies the at least one of the input power and the input current to the prime mover based on the comparison satisfying a modification condition.

Chiller suction flow limiting with input power or motor current control

A chiller system includes a compressor, a condenser and an evaporator in fluid communication. A motor drives the compressor. A variable speed drive powers the motor. An oil heater and pump system circulate heated lubricating oil in the compressor. A control panel is arranged to determine whether an input parameter is greater than or equal to a threshold parameter; deactivate the VSD in response to sensing that the input parameter is less than the threshold parameter; determine at least one chiller capacity control parameter at a point when the VSD is deactivated, and maintain the at least one chiller capacity control parameter while the VSD is deactivated; determine that the input parameter has been restored; determine a motor rotation and motor rotational speed; and in response to determining that the input parameter is restored and the motor is rotating in a forward direction, reactivate the VSD.

Variable speed drive control for chiller coast-through

A condenser includes a shell having a vapor refrigerant inlet, a first tube bundle and a liquid refrigerant outlet. A second tube bundle is positioned in a subcooler component. The subcooler component has a center channel and at least two outer channels and conforms to the shell.

Heat exchanger

A stability control algorithm is provided for a centrifugal compressor. The stability control algorithm is used to control a variable geometry diffuser and a hot gas bypass valve (when provided) in response to the detection of compressor instabilities. The stability control algorithm can adjust the position of a diffuser ring in the variable geometry diffuser in response to the detection of a surge condition or a stall condition. The diffuser ring in the variable geometry diffuser can be adjusted to determine an optimal position of the diffuser ring. The stability control algorithm can also be used to open a hot gas bypass valve in response to the detection of continued surge conditions.

Control system

A stability control algorithm is provided for a centrifugal compressor. The stability control algorithm is used to control a variable geometry diffuser and a hot gas bypass valve (when provided) in response to the detection of compressor instabilities. The stability control algorithm can adjust the position of a diffuser ring in the variable geometry diffuser in response to the detection of a surge condition or a stall condition. In addition, the diffuser ring in the variable geometry diffuser can be adjusted to determine an optimal position of the diffuser ring. The stability control algorithm can also be used to open a hot gas bypass valve in response to the detection of continued surge conditions.

System and method for stability control in a centrifugal compressor

A dual centrifugal compressor refrigeration system has one evaporator for both compressors. The evaporator provides the centrifugal compressors with refrigerant vapor through separate suction connections for each compressor. Each suction connection has a protrusion that extends into the evaporator vessel to disturb the axial flow of refrigerant vapor in the evaporator vessel. The disturbance of the axial flow of refrigerant vapor in the evaporator vessel permits a surging compressor to draw refrigerant vapor in order to recover from the surge condition.

Suction connection for dual centrifugal compressor refrigeration systems

A control system is provided to determine when to use additional compressors in a multiple compressor refrigeration system during a pull down operation. The control system determines the rate of change of the difference between the leaving chilled water temperature and a setpoint temperature during the pull down operation of the refrigeration system. If the determined rate of change of the leaving chilled water temperature difference provided by the current configuration of the refrigeration system is not adequate, then an additional compressor of the refrigeration system can be started to obtain a better rate of change. The control system can repeat this evaluation of the determined rate of change of the leaving chilled water temperature difference until all compressors in the multiple compressor refrigeration system are used.

Initial pull down control for a multiple compressor refrigeration system

A control system is provided to maintain stable operating conditions for centrifugal compressors operating in parallel when one of the centrifugal compressors enters into an unstable operating condition. The control system determines an unstable operating condition in response to signals indicating the motor current or power consumption of each compressor and the position of the pre-rotation vanes of the compressors. Once an unstable operating condition is determined, the control system closes the pre-rotation vanes to each compressor until the unstable operating condition has been corrected.

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York, PA, United States of America

Mark Robinson Bodell, Ii