Unlock instant, AI-driven research and patent intelligence for your innovation.

Vfd control for multiple circuit refrigeration system

a refrigeration system and variable speed drive technology, applied in refrigeration machines, climate sustainability, refrigeration safety arrangements, etc., can solve the problems of multiple speed drives, multiple compressor systems requiring multiple variable speed drives, and high cost of variable speed drives

Inactive Publication Date: 2018-02-01
CARRIER CORP
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a refrigeration system that can control the temperature in two separate cargo compartments using two compressors and a variable frequency drive (VFD). The system can switch between a fixed speed and a variable speed operation based on predetermined conditions in the cargo compartments, such as temperature or ambient temperature. The technical effect of this system is improved temperature control in specific cargo sections, which can help to preserve food or medicine during transport.

Problems solved by technology

Variable speed drives are expensive and therefore, multiple compressor systems requiring multiple variable speed drives also become extensively more expensive.
In addition, the use of multiple speed drives adds to the complexity and space requirements of the air conditioning or refrigeration system.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Vfd control for multiple circuit refrigeration system
  • Vfd control for multiple circuit refrigeration system
  • Vfd control for multiple circuit refrigeration system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010]FIG. 1 illustrates a simplified schematic diagram of an exemplary container refrigeration system 10 operatively associated with a transport container 12 having multiple temperature controlled compartments or zones defined therein. For example, as illustrated, transport container 12 includes a first compartment 14 and a second compartment 16. However, transport container 12 may have more than two compartments.

[0011]Refrigeration system 10 is configured to provide a cooling capacity to temperature controlled compartments 14, 16, which may store perishable commodities and / or frozen or chilled products. Transport container 12 may include, for example, truck trailers for road transport, railroad cars, and shipping container bodies for land and sea service. Refrigeration system 10 may be secured to a portion of transport container 12 such as a wall thereof.

[0012]Refrigeration system 10 generally includes a first refrigerant circuit 20, a second refrigerant circuit 30, a variable fre...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A refrigeration system includes a first refrigerant circuit having a first compressor, and a second refrigerant circuit having a second compressor, the second refrigerant circuit separate from the first refrigeration circuit. A variable frequency drive (VFD) is in signal communication with the first compressor and the second compressor and is configured to enable a variable speed operation of the first and second compressors. A controller is in signal communication with the VFD. The controller is programmed to selectively switch the first and second compressors between a variable speed operation using the VFD and a fixed speed operation such that in a first mode the first compressor is operated in the fixed speed operation and the second compressor is operated in the variable speed operation, and in a second mode the second compressor is operated in the fixed speed operation and the first compressor is operated in the variable speed operation.

Description

FIELD OF THE INVENTION[0001]The subject matter disclosed herein relates to refrigerant systems and, more specifically, to control of compressors for refrigerant systems associated with transport containers having multiple compartments.BACKGROUND[0002]Variable speed control of a compressor in a refrigeration or air conditioning application is often accomplished using a variable speed drive. This allows the removal of all unloading hardware from the compressor system. In typical applications involving more than one compressor, such as multiple circuit chillers, multiplexed compressor chillers, refrigeration, compressor racks, a variable speed control could be used with each compressor to selectively unload compressors as necessary based on system demand. Variable speed drives are expensive and therefore, multiple compressor systems requiring multiple variable speed drives also become extensively more expensive. In addition, the use of multiple speed drives adds to the complexity and s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F25B49/02
CPCF25B49/022F25B2600/0253F25B2600/021F25B2400/06F25B2600/0252Y02B30/70
Inventor KONDRK, JASON R.
Owner CARRIER CORP