EP1590617A1 - Dispositif et procede pour diagnostiquer une obstruction dans des canaux d'un micro-echangeur thermiques - Google Patents

Dispositif et procede pour diagnostiquer une obstruction dans des canaux d'un micro-echangeur thermiques

Info

Publication number
EP1590617A1
EP1590617A1 EP04703780A EP04703780A EP1590617A1 EP 1590617 A1 EP1590617 A1 EP 1590617A1 EP 04703780 A EP04703780 A EP 04703780A EP 04703780 A EP04703780 A EP 04703780A EP 1590617 A1 EP1590617 A1 EP 1590617A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
channels
micro heat
diagnosing
changes
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Withdrawn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
EP04703780A
Other languages
German (de)
English (en)
Inventor
Herbert Grieb
Astrid Lohf
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1590617A1 publication Critical patent/EP1590617A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2260/00—Heat exchangers or heat exchange elements having special size, e.g. microstructures
    • F28F2260/02—Heat exchangers or heat exchange elements having special size, e.g. microstructures having microchannels

Definitions

  • the fluids are evenly distributed over these microchannels due to their relatively high flow resistance. If individual microchannels are now blocked, the heat transfer area and thus the efficiency of the heat transfer decrease.
  • the efficiency is calculated from the capacity flows (mass flow x specific heat capacity) of the fluids involved in the heat exchange and their temperatures as they enter and exit the heat exchanger.
  • the fluid temperatures cannot be recorded directly in the microchannels because the temperature sensors currently available are so large that they would block at least a large part of the channel cross-section and that even if there is little contact with the channel wall, falsification due to heat conduction can be expected ,
  • the invention is therefore based on the object of enabling a simple diagnosis of blockages in channels of a microwave heat exchanger.
  • the object is achieved by the arrangement for diagnosing blockages in channels of a micro heat exchanger, at least one temperature sensor being arranged on the outside of the micro heat exchanger and being connected to an evaluation device which is based on changes in the measured temperature if the entry parameters of the fluids involved in the heat exchange remain unchanged, a blockage is diagnosed.
  • the object is achieved by a corresponding method specified in claim 4.
  • the axial heat conduction in the duct wall plays a major role in micro heat exchangers in contrast to conventional heat exchangers, since the ratio of wall cross-sectional area to duct cross-sectional area is greatly increased. This results in greatly reduced efficiencies compared to conventional heat exchangers, especially with materials that conduct heat well.
  • NTUs Numberer of Transfer Units
  • the efficiency decreases with falling NTU, while it remains constant in the area of large NTUs.
  • a laminar-creeping flow always prevails in the microchannels, so that the heat transfer coefficient is independent of the flow velocity. Now clog some
  • the invention now makes use of the fact that, due to the high heat conduction, the temperature of the micro heat exchanger wall with unchanged entry parameters of the fluids involved in the heat exchange, that is to say with constant mass flows and constant fluid inlet temperatures, and with sufficiently small NTU (approximately> 5) a measure for the efficiency of heat Transmitter.
  • the temperature also due to the high heat conduction in the wall, is relatively homogeneous in micro heat exchangers, so that the temperature of the micro heat exchanger can be used to draw conclusions about the efficiency, which in turn can be detected much more easily, since the temperature sensor is mounted on the outside of the micro heat exchanger is unproblematic.
  • Another advantage is that the temperature sensor does not come into contact with the fluids, so that there is no need to pay attention to the chemical resistance or the catalytic effect of the temperature sensor. With very large micro heat exchangers, the temperature can be measured with several temperature sensors at several points.
  • the blockages are not diagnosed on the basis of changes in the measured temperature; instead, a control device is connected to the temperature sensor, which regulates the mass flow of one of the fluids involved in the heat exchange in the sense of keeping the measured temperature constant, a blockage being diagnosed due to changes in the mass flow.
  • micro heat exchanger If the micro heat exchanger is used as a residence for chemical reactions, then the reaction heat to be added or removed must also be taken into account, which can be done by a more complex evaluation (fuzzy, neural networks).
  • Figure 1 shows a first embodiment
  • FIG. 1 shows a micro heat exchanger 1 with a feed line 2 and a discharge line 3 for a fluid 4 to be cooled and a feed line 5 and a discharge line 6 for a cooling fluid 7.
  • Inside the microwave heat exchanger 1 there are 2 and 3 or 5 between the feed and discharge lines and 6 each have parallel microchannels 8 with a channel diameter ⁇ 1 mm.
  • a temperature sensor 9 is arranged on the outside of the heat exchanger 1 and measures the temperature on the micro heat exchanger wall and is connected to an evaluation device 10. This detects a reduction in the efficiency of the heat exchanger 1 when the measured temperature changes with constant mass flows and constant fluid inlet temperatures.
  • the exemplary embodiment of the microwave heat exchanger according to the invention shown in FIG. 2 differs from that according to FIG. 1 in that instead of the evaluation device 10, a control device 11 is provided which, via an actuator 12, maintains the mass flow of the cooling fluid 7 in the sense of keeping the temperature sensor 8 constant regulates the measured temperature of the micro heat exchanger 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

Selon l'invention, un capteur de température (9), disposé à l'extérieur d'un micro-échangeur thermique (1), permet de diagnostiquer l'obstruction des canaux (8) du micro-échangeur thermique (1), sur lequel est fixé un dispositif d'évaluation (10), lequel diagnostique une obstruction d'après les variations de la température mesurée, dans des paramètres d'entrées inchangés, de liquides (4, 7) impliqués dans l'échange thermique.
EP04703780A 2003-01-21 2004-01-21 Dispositif et procede pour diagnostiquer une obstruction dans des canaux d'un micro-echangeur thermiques Withdrawn EP1590617A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10302156A DE10302156A1 (de) 2003-01-21 2003-01-21 Anordnung und Verfahren zur Diagnose von Verstopfungen in Kanälen eines Mikrowärmeübertragers
DE10302156 2003-01-21
PCT/EP2004/000464 WO2004065885A1 (fr) 2003-01-21 2004-01-21 Dispositif et procede pour diagnostiquer une obstruction dans des canaux d'un micro-echangeur thermiques

Publications (1)

Publication Number Publication Date
EP1590617A1 true EP1590617A1 (fr) 2005-11-02

Family

ID=32667703

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04703780A Withdrawn EP1590617A1 (fr) 2003-01-21 2004-01-21 Dispositif et procede pour diagnostiquer une obstruction dans des canaux d'un micro-echangeur thermiques

Country Status (4)

Country Link
US (1) US20060225864A1 (fr)
EP (1) EP1590617A1 (fr)
DE (1) DE10302156A1 (fr)
WO (1) WO2004065885A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110030404A1 (en) * 2009-08-04 2011-02-10 Sol Xorce Llc Heat pump with intgeral solar collector
US9689790B2 (en) 2012-07-05 2017-06-27 Honeywell International Inc. Environmental control systems and techniques for monitoring heat exchanger fouling
JP6361723B2 (ja) * 2016-12-02 2018-07-25 株式会社富士通ゼネラル マイクロ流路熱交換器
DE102017116834A1 (de) 2017-07-25 2019-01-31 Samson Ag Verfahren zur Diagnose eines Wärmetauschers

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR890001890B1 (ko) * 1984-03-23 1989-05-30 더 뱁콕 앤드 윌콕스 컴퍼니 열교환기 성능 감지기
US5005351A (en) * 1990-02-26 1991-04-09 Westinghouse Electric Corp. Power plant condenser control system
US5615733A (en) * 1996-05-01 1997-04-01 Helio-Compatic Corporation On-line monitoring system of a simulated heat-exchanger
US6001231A (en) * 1997-07-15 1999-12-14 Caliper Technologies Corp. Methods and systems for monitoring and controlling fluid flow rates in microfluidic systems
US6537506B1 (en) * 2000-02-03 2003-03-25 Cellular Process Chemistry, Inc. Miniaturized reaction apparatus
US6942018B2 (en) * 2001-09-28 2005-09-13 The Board Of Trustees Of The Leland Stanford Junior University Electroosmotic microchannel cooling system
US7134486B2 (en) * 2001-09-28 2006-11-14 The Board Of Trustees Of The Leeland Stanford Junior University Control of electrolysis gases in electroosmotic pump systems
US7201012B2 (en) * 2003-01-31 2007-04-10 Cooligy, Inc. Remedies to prevent cracking in a liquid system
US7591302B1 (en) * 2003-07-23 2009-09-22 Cooligy Inc. Pump and fan control concepts in a cooling system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004065885A1 *

Also Published As

Publication number Publication date
DE10302156A1 (de) 2004-08-05
WO2004065885A1 (fr) 2004-08-05
US20060225864A1 (en) 2006-10-12

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