EP1590617A1 - Device and method for diagnosing obstructions in channels of a micro heat exchanger - Google Patents
Device and method for diagnosing obstructions in channels of a micro heat exchangerInfo
- 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- Withdrawn
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
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10302156 | 2003-01-21 | ||
DE10302156A DE10302156A1 (en) | 2003-01-21 | 2003-01-21 | Arrangement and method for diagnosing blockages in channels of a micro heat exchanger |
PCT/EP2004/000464 WO2004065885A1 (en) | 2003-01-21 | 2004-01-21 | Device and method for diagnosing obstructions in channels of a micro heat exchanger |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1590617A1 true EP1590617A1 (en) | 2005-11-02 |
Family
ID=32667703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04703780A Withdrawn EP1590617A1 (en) | 2003-01-21 | 2004-01-21 | Device and method for diagnosing obstructions in channels of a micro heat exchanger |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060225864A1 (en) |
EP (1) | EP1590617A1 (en) |
DE (1) | DE10302156A1 (en) |
WO (1) | WO2004065885A1 (en) |
Families Citing this family (4)
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 (en) * | 2016-12-02 | 2018-07-25 | 株式会社富士通ゼネラル | Microchannel heat exchanger |
DE102017116834A1 (en) | 2017-07-25 | 2019-01-31 | Samson Ag | Method for diagnosing a heat exchanger |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR890001890B1 (en) * | 1984-03-23 | 1989-05-30 | 더 뱁콕 앤드 윌콕스 컴퍼니 | Heat exchanger performance monita |
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 |
-
2003
- 2003-01-21 DE DE10302156A patent/DE10302156A1/en not_active Withdrawn
-
2004
- 2004-01-21 EP EP04703780A patent/EP1590617A1/en not_active Withdrawn
- 2004-01-21 WO PCT/EP2004/000464 patent/WO2004065885A1/en active Search and Examination
- 2004-01-21 US US10/542,570 patent/US20060225864A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2004065885A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20060225864A1 (en) | 2006-10-12 |
WO2004065885A1 (en) | 2004-08-05 |
DE10302156A1 (en) | 2004-08-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20050720 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK |
|
DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR GB IT NL |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: LOHF, ASTRID Inventor name: GRIEB, HERBERT |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20110701 |