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Control system

A technology of control panel and restricted area, applied in the field of capacity control system of centrifugal compressors, which can solve the problems of stall, output capacity without capacity control function, surge, etc.

Active Publication Date: 2014-12-17
JOHNSON CONTROLS TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, compressor operating conditions dictated by the capacity control function can cause surge or stall conditions to occur
similarly, the surge / stall control function may not provide the desired output capacity required by the capacity control function
Additionally, other safety or operating parameters can further conflict with capacity control functions

Method used

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Examples

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Embodiment Construction

[0023] figure 1 One exemplary environment is shown for a heating, ventilation and air conditioning (HVAC) system 10 used in a building 12 in a typical commercial environment. System 10 may include a vapor compression system 14 that may supply cooling liquid that may be used to cool building 12 . System 10 may include a boiler 16 to supply heating liquid that may be used to heat building 12 , and an air distribution system to circulate air in building 12 . The air distribution system may include an air return duct 18 , an air supply duct 20 and an air handler 22 . Air handler 22 may include a heat exchanger connected to boiler 16 and vapor compression system 14 by conduit 24 . The heat exchanger in air handler 22 may receive heated liquid from boiler 16 or cooled liquid from vapor compression system 14 depending on the operating mode of system 10 . The system 10 is shown with a separate air handler on each floor of the building 12, but it is understood that these components ...

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PUM

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Abstract

A control system controls the output capacity of a compressor to avoid surge conditions in the compressor. The control system determines a capacity control output for the compressor and then modifies the capacity control output in view of any output limiters or overrides as determined by system operating parameters and to maintain a minimum frequency of operation for the compressor.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 640,308, filed April 30, 2012, entitled "CONTROL SYSTEM," which is incorporated herein by reference in its entirety. technical field [0003] The present application generally relates to control systems for compressors. More specifically, the present application relates to capacity control systems for centrifugal compressors. Background technique [0004] One method of controlling capacity in a centrifugal compressor is by adjusting the position of the pre-rotation vane (PRV), or inlet guide vane, located at the inlet of the centrifugal compressor to control the flow of refrigerant or other fluid into the compressor . The actuator can be used to open the PRV to increase the amount of refrigerant or fluid to the compressor, thereby increasing the capacity of the system. Similarly, an actuator may be used to close the PRV to reduce the amount of ...

Claims

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Application Information

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IPC IPC(8): F25B1/053F25B49/02F25B1/10F25B9/00F25B25/00
CPCF25B1/053F25B1/10F25B9/008F25B25/005F25B49/022F25B49/025F25B2339/047F25B2500/19F25B2600/021F25B2600/0261F25B2600/17F25B2600/21F25B2700/151F25B2700/195F25B2700/197F25B2700/21152F25B2700/21155F25B2700/21173Y02B30/70F04B27/02F04D29/46F25B49/02F04D27/002F04D27/004
Inventor C·C·克莱恩
Owner JOHNSON CONTROLS TECH CO