公开(公告)号：US11035600B2

公开(公告)日：2021-06-15

申请号：US16312929

申请日：2017-06-01

Applicant: Johnson Controls Technology Company

Inventor： Gail E. Lindberg ,  Curtis C. Crane

IPC: F25B49/02 ,  F04C18/16 ,  F25B1/047 ,  F04C28/12

Abstract: A compressor system includes a screw compressor and a controller. The screw compressor includes a slide valve selectively actuatable between a first position and a second position to facilitate modulating a capacity of the screw compressor between fully-loaded and fully-unloaded. The controller is communicably coupled to the slide valve. The controller is configured to receive a chilled fluid temperature setpoint for a fluid in heat transfer communication with a refrigerant of the refrigeration circuit; receive temperature data indicative of a chilled fluid temperature of the fluid; determine a difference between the chilled fluid temperature and the chilled fluid temperature setpoint; and provide one of a load command and an unload command to the slide valve based the difference between the chilled fluid temperature and the chilled fluid temperature setpoint. According to an embodiment, the controller does not receive feedback from the screw compressor regarding a position of the slide valve.

公开(公告)号：US20200300524A1

公开(公告)日：2020-09-24

申请号：US16088790

申请日：2017-03-29

Applicant: Johnson Controls Technology Company

Inventor： Brian Thomas Gallus ,  Curtis C. Crane ,  Justin P. Kauffman

IPC: F25B49/02 ,  G01F1/684

Abstract: The present disclosure relates to a sensor disposed in a conduit on a suction side of a compressor, wherein the conduit is configured to convey a fluid and a controller communicatively coupled to the sensor. The controller includes a processor and a memory, the memory is configured to store instructions to be performed by the processor, and the controller is configured to receive one or more indications from the sensor of an amount of power consumed by an active sensor component, determine a presence of liquid in the fluid based at least on the one or more indications, and control a device based on the presence of liquid in the fluid.

公开(公告)号：US20200240685A1

公开(公告)日：2020-07-30

申请号：US16652581

申请日：2018-10-04

Applicant: Johnson Controls Technology Company

Inventor： David Andrew Bradshaw ,  Andrew Michael Welch ,  Curtis C. Crane ,  Calvin Andrew Nelson

IPC: F25B39/04 ,  F25B43/04

Abstract: Embodiments of the present disclosure are directed toward purge units of vapor compression systems, and methods of control thereof, that improve efficiency by selectively activating and deactivating the purge unit in response to one or more conditions to, for example, enable refrigerant-to-air ratios within the purge unit within certain industry standards while still minimizing the durations of the purge cycles. For example, in certain embodiments, these conditions may include conditions within the chiller condenser, time since last purge activation, time since last venting of non-condensables, and combinations thereof. By reducing an amount of time that the purge unit would be active without removing a substantial amount non-condensables from the vapor compression system, present embodiments reduce the power consumption of the purge unit, as well as the vapor compression system as a whole, while still being responsive to prevent or mitigate a loss of efficiency due to a substantial accumulation of non-condensables in the condenser of the vapor compression system.

公开(公告)号：US20180101157A1

公开(公告)日：2018-04-12

申请号：US15424593

申请日：2017-02-03

Applicant: Johnson Controls Technology Company

Inventor： Christopher R. Amundson ,  David A. Kondrad ,  Kraig D. Ritmanich ,  Aron M. Seiler ,  Jameel Ahmed ,  Curtis C. Crane ,  Vivek V. Gupta ,  Daniel F. Leising ,  Brandon A. Sloat ,  Lisa E. Strand

IPC: G05B19/042

Abstract: An equipment controller in a building management system (BMS) includes a feature detector and a dynamic point list generator. The feature detector is configured to receive sensor input from a sensor and determine a set of features available to the equipment controller based on the sensor input. The dynamic point list generator is configured to determine unavailable features based on the set of available features and identify one or more points in a complete point list associated with the set of unavailable features. The dynamic point list generator is configured to generate a dynamic point list by removing the identified points from the complete point list and expose the dynamic point list to a BMS controller communicably connected to the equipment controller.