EP1892489A2 - Procédé destiné à surveiller un circuit de refroidissement de compression - Google Patents

Procédé destiné à surveiller un circuit de refroidissement de compression Download PDF

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Publication number
EP1892489A2
EP1892489A2 EP07016052A EP07016052A EP1892489A2 EP 1892489 A2 EP1892489 A2 EP 1892489A2 EP 07016052 A EP07016052 A EP 07016052A EP 07016052 A EP07016052 A EP 07016052A EP 1892489 A2 EP1892489 A2 EP 1892489A2
Authority
EP
European Patent Office
Prior art keywords
temperature
throttle
compressor
refrigerant
heat exchanger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07016052A
Other languages
German (de)
English (en)
Other versions
EP1892489A3 (fr
Inventor
Markus Hiegemann
Peter Menne
Axel Schöps
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vaillant GmbH
Original Assignee
Vaillant GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vaillant GmbH filed Critical Vaillant GmbH
Publication of EP1892489A2 publication Critical patent/EP1892489A2/fr
Publication of EP1892489A3 publication Critical patent/EP1892489A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21163—Temperatures of a condenser of the refrigerant at the outlet of the condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of the evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters

Definitions

  • the invention relates to a method for monitoring a compression refrigeration cycle with at least one compressor, a condenser, a throttle and an evaporator.
  • the refrigerant must be liquid between the compressor and the throttle in the high pressure range. Between the throttle and the compressor, the refrigerant must be gaseous in the low pressure range. If this is not the case, it will cause interference.
  • the overheating ⁇ T L is defined as the difference between the temperature of the superheated gas (inlet temperature in the compressor) T L and the evaporation temperature T " L on the dew line at the low pressure associated with T L Temperature difference between the measured temperature of the gas from the dew line.
  • the supercooling .DELTA.T H is defined as the difference between the high pressure present at T H associated boiling temperature T ' H on the boiling line and the temperature of the supercooled liquid (inlet temperature in the throttle) T H. It thus indicates the distance or the temperature difference of the measured liquid temperature from the boiling line.
  • the causes of a too low overheating ⁇ T L are, for example, an incorrectly set throttle (Thermostatic Expansion Valve (TEV)), insufficient contact of the temperature sensor of the TEV or a defective or incorrectly adjusted TEV.
  • TEV Thermostatic Expansion Valve
  • Cause of fault for too high overheating ⁇ T L could also be a leak in the refrigerant circuit with the loss of refrigerant.
  • a permanent operation with too little refrigerant and thus an operation with too high overheating can lead to an excessive compressor end temperature and thus also permanently damage the compressor thermally.
  • the object of the invention is an automatic monitoring by an automatic calculation of overheating and subcooling, which is based on the measurement of integrated in the refrigerant circuit temperature and pressure sensors and corresponding stored algorithms.
  • This automatic comparison of overheating and super-cooling with critical values protects the refrigeration circuit from erroneous operation.
  • the data in the display of the device and online can be read.
  • the monitoring can be done very easily via the display or online in the form of a remote diagnosis / remote monitoring.
  • active refrigerant leakage monitoring can be ensured.
  • Figure 1 shows a compression refrigeration cycle with a compressor 1, a condenser 2, an internal heat exchanger 5, a throttle 3 and an evaporator 4.
  • a gaseous refrigerant is compressed in a compressor 1 to high pressure; In this case, the refrigerant is heated. Subsequently, the refrigerant in a condenser 2 gives off heat. This heat can be used for heating purposes.
  • the refrigerant is then introduced into the internal heat exchanger 5. Subsequently, the then liquid refrigerant reaches the throttle 3, in which it is relaxed and partially gaseous. In which subsequent evaporator 4, the refrigerant absorbs heat; This happens with heat pumps by environmental heat. The refrigerant becomes completely gaseous.
  • the refrigerant enters the internal heat exchanger 5, in which a heat exchange with the refrigerant flow between the condenser 2 and throttle 3 takes place. After the internal heat exchanger 5, the gaseous refrigerant flows back to the compressor. 1
  • the temperature T H between the condenser 2 and throttle 3 is detected.
  • the temperature difference ⁇ T H results from the difference between T ' H and T H.
  • an error status is activated. This can be displayed on an ad. Furthermore, the error status can be retrieved via a remote data connection.
  • the compression refrigeration cycle is turned off to prevent damage.
  • An equivalent monitoring is carried out in the low pressure range.
  • a fault condition is activated when the temperature difference .DELTA.T L falls below a critical limit, as well as an error status activated when the temperature difference .DELTA.T L exceeds a critical limit.
  • FIG. 2 shows the wet steam area N of a cooling process in the pressure-enthalpy diagram (log p-h) in which the operating points A to D are shown in FIG.
  • the refrigerant is in two phases.
  • To the left of the wet steam area N is subcooled liquid SL, to the right of the wet steam area N is superheated gas SG.
  • the wet steam area N is separated from the supercooled liquid area by the boiling line BL.
  • the dew line DL separates the wet steam area N from the area of the superheated gas SG.
  • the critical point K at maximum pressure of the wet steam area N separates the boiling line BL from the dew line DL.
  • the numbers 1 to 5 in FIG. 2 clarify which operating states in units 1 to 5 are traversed with respect to their position in the wet steam zone N or in the gaseous SG and liquid zone SL.
  • the refrigerant Downstream of the compressor 1, the refrigerant is present as a superheated gas at a pressure p H at point B.
  • the refrigerant In the condenser 2, the refrigerant is cooled and in this case passes through the wet steam area N.
  • the refrigerant releases further heat. It adjusts a temperature T H at the point C in the region of the supercooled liquid SL.
  • the throttle 3 In the throttle 3, the refrigerant is expanded to a pressure p L at the point D.
  • the refrigerant In the evaporator 4, the refrigerant is heated along the line 4 through the wet steam area N.
  • the refrigerant absorbs the heat which emits the refrigerant between the condenser 2 and the throttle 3.
  • Both the overheating ⁇ T L and the subcooling ⁇ T H are setpoints or nominal ranges. If the values for the overheating ⁇ T L and / or supercooling ⁇ T H determined from the measured values T H , T L , p H and p L differ significantly from the desired value, this is an indication of the presence of an error.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Air Conditioning Control Device (AREA)
EP07016052A 2006-08-21 2007-08-16 Procédé destiné à surveiller un circuit de refroidissement de compression Withdrawn EP1892489A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006038961 2006-08-21
AT20612006 2006-12-14

Publications (2)

Publication Number Publication Date
EP1892489A2 true EP1892489A2 (fr) 2008-02-27
EP1892489A3 EP1892489A3 (fr) 2011-05-11

Family

ID=38814468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07016052A Withdrawn EP1892489A3 (fr) 2006-08-21 2007-08-16 Procédé destiné à surveiller un circuit de refroidissement de compression

Country Status (1)

Country Link
EP (1) EP1892489A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3922924A1 (fr) * 2020-06-09 2021-12-15 Stiebel Eltron GmbH & Co. KG Procédé de fonctionnement d'une installation de réfrigération à compression et installation de réfrigération à compression

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4124363C2 (de) * 1991-07-23 1994-02-03 Daimler Benz Ag Verfahren zur Überwachung des Kältemittel-Füllstandes in einer Kälteanlage
DE4401415C1 (de) * 1994-01-19 1994-12-01 Daimler Benz Ag Verfahren zur Überwachung des Kältemittelfüllstandes in einer Kälteanlage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3922924A1 (fr) * 2020-06-09 2021-12-15 Stiebel Eltron GmbH & Co. KG Procédé de fonctionnement d'une installation de réfrigération à compression et installation de réfrigération à compression

Also Published As

Publication number Publication date
EP1892489A3 (fr) 2011-05-11

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