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Self tuning pull-down fuzzy logic temp control for refrigeration systems

A refrigeration system, temperature control system technology, applied in the field of fluid temperature control, can solve the problem of cooler shutdown, etc., to minimize or eliminate the effect of pull-down overshoot

Inactive Publication Date: 2006-11-01
YORK INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the control is still not fully compensated for the initial overshoot, these algorithms can cause the cooler to shut down during the initial and subsequent pull-down

Method used

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  • Self tuning pull-down fuzzy logic temp control for refrigeration systems
  • Self tuning pull-down fuzzy logic temp control for refrigeration systems
  • Self tuning pull-down fuzzy logic temp control for refrigeration systems

Examples

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Embodiment Construction

[0019] figure 1A general system to which the invention is applied is exemplified in . As shown, HVAC refrigeration system 100 includes compressor 110 , condenser 112 , water cooler or evaporator 126 , and control panel 140 . The control panel 140 includes an analog-to-digital (A / D) converter 148 , a microprocessor 150 , non-volatile memory 144 , and an interface board 146 . The operation of the control panel 140 will be discussed in more detail below. Traditional liquid cooling systems include many other figure 1 parts not shown. For ease of illustration and simplification of the drawings, these parts are omitted here.

[0020] Compressor 110 compresses refrigerant vapor and sends it to condenser 112 . The compressor 110 is preferably a centrifugal compressor, however other types of compressors such as screw compressors, reciprocating compressors, and screw compressors may also be used. The condenser 112 includes a heat exchanger coil 116 connected to a cooling tower 122...

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PUM

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Abstract

A pull-down control algorithm for an HVAC refrigeration system (100) is provided. The control algorithm utilizes fuzzy logic methods to automatically adjust the flow of refrigerant in the system (100) during pull down to maintain the desired pull down rate. As the temperature of the fluid being pulled approaches the desired operating set point, the desired pull down rate is reduced proportionally to avoid or minimize any overshoot to the operating set point. The desired pull-down rate is obtained by adjusting the rate sensitivity factor used in the control algorithm. When the temperature of the fluid being pulled is above the operating set point by a predetermined value, the control algorithm uses fuzzy logic methodology to determine the rate sensitivity that results in the desired pull down rate approaching the operating set point without overshoot.

Description

technical field [0001] The present invention relates to fluid temperature control in refrigeration systems. In particular, it relates to the use of fuzzy logic to control the rate at which the cooling water temperature exiting the chiller is reduced to a predetermined set point while minimizing overshoot of the predetermined set point. Background technique [0002] In a chilled water system, chilled water is circulated throughout a building to remove heat from that building. The water in this chilled water system is cooled using a heat exchanger in an evaporator or cooler, where the refrigerant that receives heat from the water cools the water. For optimum efficiency, cooling water systems typically operate at a temperature within a few degrees of the freezing point of the water (the operating set point). In existing coolers, a control system is usually designed to shut off the cooler when the evaporator water temperature drops to a certain temperature (cut-off point) clos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/02G05B5/01F25B49/00F24F11/02G05D23/19
CPCF25D2700/121G05B5/01G05B13/0275F25B13/00
Inventor 格雷戈里·比弗森万达·米勒
Owner YORK INT CORP
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