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Control arrangements for controlling overheating

A superheating, controller technology, used in refrigeration safety arrangements, refrigerators, refrigeration components, etc.

Active Publication Date: 2017-03-15
DANFOSS AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is a disadvantage because in some applications another control algorithm will be more appropriate

Method used

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  • Control arrangements for controlling overheating
  • Control arrangements for controlling overheating
  • Control arrangements for controlling overheating

Examples

Experimental program
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Effect test

Embodiment Construction

[0058] figure 1 is a block diagram of a control arrangement 1 according to a first embodiment of the invention. figure 1 The control arrangement 1 of can be used to control the supply of refrigerant to an evaporator 2 of a vapor compression system in order to obtain a desired superheat value of the refrigerant leaving the evaporator 3 . This is done by controlling the opening of an expansion valve 3 arranged to supply refrigerant to the evaporator 2 .

[0059] The control arrangement 1 comprises a first sensor 4 and a second sensor 5 . The first sensor 4 is a temperature sensor which is arranged in the refrigerant path between the expansion valve 3 and the evaporator 2 at or near an inlet opening of the evaporator 2 . Thus, the first sensor 4 measures the temperature of the refrigerant entering the evaporator 2 . Alternatively, the first sensor 4 may be arranged on an outer wall of the pipe system leading the refrigerant to the evaporator 2 .

[0060] The second sensor 5 i...

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Abstract

A control arrangement (1) for controlling superheating of a vapor compression system is disclosed herein. The control arrangement (1) comprises: a first sensor (4) and a second sensor (5) for measuring control parameters allowing to derive a superheat value; a first controller (6), the first a controller arranged to receive a signal from the first sensor (4); a second controller (10) arranged to receive a superheat value derived via a subtraction element (9) and supplying a control signal based on the derived superheat value and according to a reference superheat value; and a summation element (8) arranged to receive from the first controller (6) and the second controller (10 ) receives an input, the summing element (8) being arranged to supply a control signal for controlling the opening of the expansion device (3) based on the received input. According to a first aspect, the control arrangement comprises a low pass filter (7) arranged to receive a signal from the first sensor (4) and supply a signal to the subtraction element (9), so The low-pass filter (7) is designed according to the dynamic behavior of the evaporator (2) and / or the first sensor (4). According to a second aspect, the first controller (6) comprises a PD element.

Description

technical field [0001] The present invention relates to a control arrangement for controlling superheating of a vapor compression system such as a refrigeration system, air conditioning system or heat pump. The control arrangement of the present invention may be used in conjunction with any control algorithm suitable for a particular application and is not limited to one particular control algorithm. Background technique [0002] When controlling a vapor compression system such as a refrigeration system, air conditioning system or heat pump, the supply of refrigerant to the evaporator is usually controlled in such a way that the superheat value of the refrigerant leaving the evaporator is maintained at a small positive value. The superheat value is the temperature difference between the temperature of the refrigerant leaving the evaporator and the dew point of the refrigerant leaving the evaporator. Thus, a high superheat value indicates that gaseous and heated refrigerant ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02
CPCF25B49/02F25B2700/197F25B2700/21172F25B2700/21173F25B2700/21175F25B2600/2513F25B2600/21F25B41/34F25B2341/0683
Inventor 罗兹拜赫·艾扎德-扎玛纳巴德孚莱德·施密特
Owner DANFOSS AS
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