Variable speed drive chiller system

a chiller system and variable speed technology, applied in the field of variable speed drive chiller systems, can solve the problems of adding a variable speed drive to a conventional compressor, greatly increasing the cost, and adding a degree of redundancy, so as to minimize the initial cost and minimize the operating cost

Inactive Publication Date: 2007-05-01
CARRIER CORP
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Benefits of technology

[0011]Basically, the compressor in a refrigeration system is controlled solely by a variable speed drive which controls the motor of the compressor by virtue of the varying of the frequency of the electric current provided to the motor. To minimize th

Problems solved by technology

So, adding a variable speed drive to a conventional compressor greatly increases the cost and adds a degree of redundancy since the unloader valve, or other mechanical unloading structure, has some functional overlap with

Method used

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  • Variable speed drive chiller system
  • Variable speed drive chiller system

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Embodiment Construction

[0014]For a refrigeration system a particular system capacity is the starting point in designing the system. A compressor capable of producing the required capacity will be chosen based upon factors such as cost, efficiency and operating speed. The selection of the compressor will be in conjunction with the selection of the motor. Motors are available having power factors in the range of 0.80 to 0.93 and the motor will be selected based upon cost, power factor, efficiency at design compressor speed. Variable speed drives are available which have power factors running from 0.99 to unity. However, the differences between the standard sizes of the variable speed drives are relatively large such that a considerably oversized variable speed drive might be the smallest standard drive available sufficient to meet design requirements. By cooling the variable speed drive with refrigerant from the condenser, it may be operated at higher than its air cooled drive design capacity because of the...

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Abstract

The compressor in a refrigeration system is controlled solely by a variable speed drive which controls the motor of the compressor by virtue of the varying of the frequency of the electricity provided to the motor. To minimize the initial cost and to minimize operating costs, the variable speed drive is cooled by refrigerant from the refrigeration system which permits the use of a smaller drive, and the variable speed drive is operated at, or approaching, a unity power factor.

Description

[0001]A second reissue application, 11 / 397,888, for U.S. Pat. No. 6,434,960, has been filed on Apr. 4, 2006.BACKGROUND OF THE INVENTION[0002]In screw compressors the bores for the rotors overlap. The overlapping bores create cusps in the nature of the waist of a figure eight. One of the cusps in the normal lactation for one form of a mechanical unloader which forms a portion of the bore and coacts with the rotors as it moves axially in the cusp to unload and to control the V1 or discharge volume to suction volume ratio, of the compressor. The unloader is normally driven by a solenoid. To provide a greater degree of control, it is common to provide a variable speed drive which controls the motor by changing the frequency of the electric power being supplied to the motor by the variable speed drive.SUMMARY OF THE INVENTION[0003]The cost of a variable speed drive is on the order of that of a compressor. So, adding a variable speed drive to a conventional compressor greatly increases th...

Claims

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Application Information

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IPC IPC(8): F25B49/00F25B1/00F25B27/00F25B1/047F25B31/00F25B49/02
CPCF25B1/047F25B31/006F25B49/025F25B2400/13F25B2400/23F25B2600/024F25B2600/0253F25B2700/21173Y02B30/70A01K61/51
Inventor ROUSSEAU, WILLIAM H.
Owner CARRIER CORP
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