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：US20190249666A1

公开(公告)日：2019-08-15

申请号：US16312929

申请日：2017-06-01

Applicant: Johnson Controls Technology Company

Inventor： Gail E. Lindberg ,  Curtis C. Crane

IPC: F04C28/12 ,  F04C18/16

CPC classification number: F04C28/12 ,  F04C18/16 ,  F04C2210/22 ,  F04C2270/015 ,  F04C2270/195 ,  F04C2270/585

Abstract: A compressor system includes a screw compressor (48) and a controller (100). The screw compressor includes a slide valve (49) 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 example embodiment, the controller (100) does not receive feedback from the screw compressor (48) regarding a position of the slide valve (49).