EP1635127A2 - Method for temperature measurement in a heat exchanger - Google Patents
Method for temperature measurement in a heat exchanger Download PDFInfo
- Publication number
- EP1635127A2 EP1635127A2 EP05019280A EP05019280A EP1635127A2 EP 1635127 A2 EP1635127 A2 EP 1635127A2 EP 05019280 A EP05019280 A EP 05019280A EP 05019280 A EP05019280 A EP 05019280A EP 1635127 A2 EP1635127 A2 EP 1635127A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- wall
- water
- heat exchanger
- temperature sensor
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000010354 integration Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 239000002737 fuel gas Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
Definitions
- the invention relates to a method for measuring temperature in a heat exchanger according to the preamble of patent claim 1.
- Precise control is important for the economic and safe operation of a heating system. This is essentially based on measured temperatures, whereby usually the flow temperature is decisive in the control.
- Boilers have a heat exchanger for the heat exchange between hot gases in a hot gas and water as a heating medium in a water room. These heat exchangers are often made of a cast material, such as aluminum or cast iron. This results in compact designs and it must be ensured a forced flow with the heating medium.
- temperature sensors are usually located in the water space of a boiler, for example within a dip tube. Therefore, they are only affected by the heating water.
- the disadvantage is the relatively late detection of a temperature rise in the event of water shortage, because then the sensor is in the airspace.
- the temperature readings may fluctuate because, for example, due to flow, the temperature distribution in the water space is uneven.
- temperature measuring points are known which detect only a wall temperature. Negative here have different temperature spreads between fuel gas and water side at low load and full load operation.
- the invention is therefore based on the object to provide a simple and reliable method for measuring temperature in a forced-flow heat exchanger of a boiler.
- the method for measuring the temperature in a heat exchanger is characterized in that at least one temperature sensor is provided in an inner wall arranged in the water space, and in that the measured control-relevant temperature is an integration value of inner wall temperature, outer wall temperature and water temperature.
- the temperature measured with the at least one temperature sensor in the inner wall arranged in the water space flows as a flow temperature into the control.
- the temperature sensor is inserted in a bore in the inner wall arranged in the water space and is therefore in a good heat-conducting contact with the surrounding wall.
- a good heat input from the outer wall is ensured at the position of the at least one temperature sensor, and the inner wall arranged in the water space is well flowed around by the heating medium.
- a simple and reliable method for measuring the temperature in a forced-flow heat exchanger of a boiler is provided.
- Immersion sleeves are no longer necessary and the advantages of the casting material, namely sufficient wall thicknesses, good heat transfer and anyway necessary ribs in the water space, are used. Any water shortages that occur can be detected more reliably and faster than with conventional measuring methods.
- An uneven temperature distribution in the water space also has no effect on the temperature measurement as different temperature spreads between fuel gas and water side at low load and full load operation.
- the integration of interior wall, exterior wall and water temperature combines the advantages of several existing individual measuring points.
- the following table shows exemplary measured values which lead to the corresponding temperature at the sensor in the position according to the invention: operating mode Water temperature [C °] Inside wall temperature [C °] Outside wall temperature [C °] Temperature at the sensor [C °] Low fire 80 82 79 81 Voillast 80 100 80 85
- the drawing illustrates an embodiment of the invention and shows in a single figure a measuring point on a heat exchanger in section.
- a forced-flow heat exchanger of a boiler is designed for the heat exchange between hot gases in a hot gas H and boiler water in a water space W.
- a temperature sensor T is arranged in an inner wall I arranged in the water space W and passes through the outer wall A, so that the measured temperature which is decisive for the control is an integration value of the inner wall temperature, outer wall temperature and water temperature.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Temperaturmessung in einem Wärmetauscher nach dem Oberbegriff des Patentanspruches 1.
Für den wirtschaftlichen und sicheren Betrieb einer Heizungsanlage ist eine genaue Regelung wichtig. Diese basiert im Wesentlichen auf gemessenen Temperaturen, wobei üblicherweise die Vorlauftemperatur maßgebend in die Regelung einfließt. Heizkessel besitzen einen Wärmetauscher für den Wärmeaustausch zwischen Heizgasen in einem Heizgaszug und Wasser als Heizmedium in einem Wasserraum. Diese Wärmetauscher werden häufig aus einem Gusswerkstoff, beispielsweise Aluminium oder Gusseisen, hergestellt. Dadurch ergeben sich kompakte Bauformen und es muss eine Zwangsdurchströmung mit dem Heizmedium sichergestellt sein.
Bei bekannten Verfahren zur Temperaturmessung in einem Wärmetauscher sitzen Temperaturfühler in der Regel im Wasserraum eines Heizkessels, zum Beispiel innerhalb einer Tauchhülse. Daher werden sie nur vom Heizwasser beeinflusst. Nachteilig ist daran die relativ späte Erfassung eines Temperaturanstiegs im Falle von auftretendem Wassermangel, weil sich dann der Sensor im Luftraum befindet. Außerdem können möglicherweise die Temperaturmesswerte schwanken, weil zum Beispiel strömungsbedingt die Temperaturverteilung im Wasserraum ungleichmäßig ist.
Andererseits sind auch Temperaturmessstellen bekannt, welche ausschließlich eine Wandtemperatur erfassen. Negativ wirken sich hier abweichende Temperaturspreizungen zwischen Heizgas- und Wasserseite bei Kleinlast- und Volllastbetrieb aus.The invention relates to a method for measuring temperature in a heat exchanger according to the preamble of patent claim 1.
Precise control is important for the economic and safe operation of a heating system. This is essentially based on measured temperatures, whereby usually the flow temperature is decisive in the control. Boilers have a heat exchanger for the heat exchange between hot gases in a hot gas and water as a heating medium in a water room. These heat exchangers are often made of a cast material, such as aluminum or cast iron. This results in compact designs and it must be ensured a forced flow with the heating medium.
In known methods for measuring temperature in a heat exchanger, temperature sensors are usually located in the water space of a boiler, for example within a dip tube. Therefore, they are only affected by the heating water. The disadvantage is the relatively late detection of a temperature rise in the event of water shortage, because then the sensor is in the airspace. In addition, the temperature readings may fluctuate because, for example, due to flow, the temperature distribution in the water space is uneven.
On the other hand, temperature measuring points are known which detect only a wall temperature. Negative here have different temperature spreads between fuel gas and water side at low load and full load operation.
Der Erfindung liegt daher die Aufgabe zu Grunde, ein einfaches und sicheres Verfahren zur Temperaturmessung in einem zwangsdurchströmten Wärmetauscher eines Heizkessels zu schaffen.The invention is therefore based on the object to provide a simple and reliable method for measuring temperature in a forced-flow heat exchanger of a boiler.
Erfindungsgemäß wurde dies mit den Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Weiterbildungen sind den Unteransprüchen zu entnehmen.This has been achieved with the features of claim 1 according to the invention. Advantageous developments can be found in the dependent claims.
Das Verfahren zur Temperaturmessung in einem Wärmetauscher ist dadurch gekennzeichnet, dass mindestens ein Temperaturfühler in einer im Wasserraum angeordneten Innenwand vorgesehen ist, und dass die gemessene, für die Regelung maßgebende Temperatur ein Integrationswert aus Innenwandtemperatur, Außenwandtemperatur und Wassertemperatur ist.
Dabei fließt die mit dem mindestens einen Temperaturfühler in der im Wasserraum angeordneten Innenwand gemessene Temperatur als Vorlauftemperatur in die Regelung ein. Der Temperaturfühler ist in einer Bohrung in der im Wasserraum angeordneten Innenwand eingesetzt und steht daher mit der umgebenden Wand in einem gut Wärme leitenden Kontakt. An der Position des mindestens einen Temperaturfühlers ist gleichzeitig auch ein guter Wärmeeintrag aus der Außenwand sichergestellt und die im Wasserraum angeordnete Innenwand wird gut vom Heizmedium umströmt.
Mit dem erfindungsgemäßen Verfahren und der dazu gehörenden Anordnung wird ein einfaches und sicheres Verfahren zur Temperaturmessung in einem zwangsdurchströmten Wärmetauscher eines Heizkessels geschaffen. Tauchhülsen sind nicht mehr nötig und die Vorteile des Gusswerkstoffes, nämlich ausreichende Wanddicken, guter Wärmeübergang und ohnehin nötige Rippen im Bereich des Wasserraumes, werden genutzt. Eventuell auftretender Wassermangel kann sicherer und schneller als mit herkömmlichen Messmethoden detektiert werden. Eine ungleichmäßige Temperaturverteilung im Wasserraum hat ebenso keinen Einfluss auf die Temperaturmessung wie unterschiedliche Temperaturspreizungen zwischen Heizgas- und Wasserseite bei Kleinlast- und Volllastbetrieb. Durch die Integration von Innenwand-, Außenwand- und Wassertemperatur werden die Vorteile von mehreren bisherigen Einzelmessstellen kombiniert.
In der nachfolgenden Tabelle finden sich beispielhafte Messwerte, welche zur entsprechenden Temperatur am Fühler in der erfindungsgemäßen Position führen:
In this case, the temperature measured with the at least one temperature sensor in the inner wall arranged in the water space flows as a flow temperature into the control. The temperature sensor is inserted in a bore in the inner wall arranged in the water space and is therefore in a good heat-conducting contact with the surrounding wall. At the same time, a good heat input from the outer wall is ensured at the position of the at least one temperature sensor, and the inner wall arranged in the water space is well flowed around by the heating medium.
With the method according to the invention and the associated arrangement, a simple and reliable method for measuring the temperature in a forced-flow heat exchanger of a boiler is provided. Immersion sleeves are no longer necessary and the advantages of the casting material, namely sufficient wall thicknesses, good heat transfer and anyway necessary ribs in the water space, are used. Any water shortages that occur can be detected more reliably and faster than with conventional measuring methods. An uneven temperature distribution in the water space also has no effect on the temperature measurement as different temperature spreads between fuel gas and water side at low load and full load operation. The integration of interior wall, exterior wall and water temperature combines the advantages of several existing individual measuring points.
The following table shows exemplary measured values which lead to the corresponding temperature at the sensor in the position according to the invention:
Die Zeichnung stellt ein Ausführungsbeispiel der Erfindung dar und zeigt in einer einzigen Figur eine Messstelle an einem Wärmetauscher im Schnitt.The drawing illustrates an embodiment of the invention and shows in a single figure a measuring point on a heat exchanger in section.
Ein zwangsdurchströmter Wärmetauscher eines Heizkessels ist für den Wärmeaustausch zwischen Heizgasen in einem Heizgaszug H und Kesselwasser in einem Wasserraum W ausgelegt.
Ein Temperaturfühler T ist in einer im Wasserraum W angeordneten Innenwand I angeordnet und durchgreift die Außenwand A, so dass die gemessene, für die Regelung maßgebende Temperatur ein Integrationswert aus Innenwandtemperatur, Außenwandtemperatur und Wassertemperatur ist.A forced-flow heat exchanger of a boiler is designed for the heat exchange between hot gases in a hot gas H and boiler water in a water space W.
A temperature sensor T is arranged in an inner wall I arranged in the water space W and passes through the outer wall A, so that the measured temperature which is decisive for the control is an integration value of the inner wall temperature, outer wall temperature and water temperature.
Claims (5)
dadurch gekennzeichnet, dass mindestens ein Temperaturfühler (T) in einer im Wasserraum (W) angeordneten Innenwand (I) vorgesehen ist, und dass die gemessene, für die Regelung maßgebende Temperatur ein Integrationswert aus Innenwandtemperatur, Außenwandtemperatur und Wassertemperatur ist.Method for temperature measurement in a heat exchanger with at least one temperature sensor (T), in particular in a forced flow heat exchanger of a boiler made of a cast material, which is designed for the heat exchange between hot gases in a hot gas flue and boiler water in a water space (W),
characterized in that at least one temperature sensor (T) is provided in an inner wall (I) arranged in the water space (W), and in that the measured temperature governing the control is an integration value of inner wall temperature, outer wall temperature and water temperature.
dadurch gekennzeichnet, dass die mit dem mindestens einen Temperaturfühler (T) in der im Wasserraum (W) angeordneten Innenwand (I) gemessene Temperatur als Vorlauftemperatur in die Regelung einfließt.Method according to claim 1,
characterized in that the temperature measured with the at least one temperature sensor (T) in the inner wall (I) arranged in the water space (W) flows into the control as the flow temperature.
dadurch gekennzeichnet, dass mindestens ein Temperaturfühler (T) in einer Bohrung in der im Wasserraum (W) angeordneten Innenwand (I) eingesetzt ist und mit dieser in einem gut Wärme leitenden Kontakt steht.Apparatus for carrying out the method according to claim 1 or 2,
characterized in that at least one temperature sensor (T) is inserted in a bore in the water space (W) arranged inside wall (I) and is in contact with this in a good heat.
dadurch gekennzeichnet, dass an der Position des mindestens einen Temperaturfühlers (T) ein guter Wärmeeintrag aus der Außenwand (A) sichergestellt ist.Device for carrying out the method according to one of Claims 1 to 3,
characterized in that a good heat input from the outer wall (A) is ensured at the position of the at least one temperature sensor (T).
dadurch gekennzeichnet, dass an der Position des mindestens einen Temperaturfühlers (T) die im Wasserraum (W) angeordnete Innenwand (I) gut vom Heizmedium umströmt wird.Device for carrying out the method according to one of claims 1 to 4,
characterized in that at the position of the at least one temperature sensor (T) arranged in the water space (W) inner wall (I) is well flowed around by the heating medium.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004043832A DE102004043832B4 (en) | 2004-09-10 | 2004-09-10 | Method for measuring temperature in a heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1635127A2 true EP1635127A2 (en) | 2006-03-15 |
| EP1635127A3 EP1635127A3 (en) | 2010-09-08 |
Family
ID=35447446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05019280A Withdrawn EP1635127A3 (en) | 2004-09-10 | 2005-09-06 | Method for temperature measurement in a heat exchanger |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1635127A3 (en) |
| DE (1) | DE102004043832B4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3208552A1 (en) * | 2016-02-19 | 2017-08-23 | Vaillant GmbH | Heating heat exchanger |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3839244A1 (en) * | 1988-02-24 | 1989-09-07 | Webasto Ag Fahrzeugtechnik | HEATER, ESPECIALLY VEHICLE ADDITIONAL HEATER |
| DE29512130U1 (en) * | 1994-08-02 | 1995-09-28 | Rapido Wärmetechnik GmbH, 41748 Viersen | boiler |
| DE10051755C1 (en) * | 2000-10-18 | 2002-04-18 | Webasto Thermosysteme Gmbh | Heat exchanger for motor vehicle's auxiliary heater has overheat protection sensor installed in outwards orientated boss formed on heat exchanger's inner section and which fits in sealed opening in outer section |
| DE10056620C1 (en) * | 2000-11-15 | 2002-05-08 | Webasto Thermosysteme Gmbh | Heat exchanger for automobile auxiliary heating device has temperature sensor for detecting temperature of heat transfer medium fitted in indent in heat exchanger wall |
-
2004
- 2004-09-10 DE DE102004043832A patent/DE102004043832B4/en not_active Expired - Fee Related
-
2005
- 2005-09-06 EP EP05019280A patent/EP1635127A3/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3839244A1 (en) * | 1988-02-24 | 1989-09-07 | Webasto Ag Fahrzeugtechnik | HEATER, ESPECIALLY VEHICLE ADDITIONAL HEATER |
| DE29512130U1 (en) * | 1994-08-02 | 1995-09-28 | Rapido Wärmetechnik GmbH, 41748 Viersen | boiler |
| DE10051755C1 (en) * | 2000-10-18 | 2002-04-18 | Webasto Thermosysteme Gmbh | Heat exchanger for motor vehicle's auxiliary heater has overheat protection sensor installed in outwards orientated boss formed on heat exchanger's inner section and which fits in sealed opening in outer section |
| DE10056620C1 (en) * | 2000-11-15 | 2002-05-08 | Webasto Thermosysteme Gmbh | Heat exchanger for automobile auxiliary heating device has temperature sensor for detecting temperature of heat transfer medium fitted in indent in heat exchanger wall |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3208552A1 (en) * | 2016-02-19 | 2017-08-23 | Vaillant GmbH | Heating heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1635127A3 (en) | 2010-09-08 |
| DE102004043832B4 (en) | 2006-07-27 |
| DE102004043832A1 (en) | 2006-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0065330A1 (en) | Cooling element for industrial furnaces | |
| DE2512233A1 (en) | Hot water boiler with calorifier - has economiser using intermediate water moving in counterflow as heat transfer medium (NL220976) | |
| EP2458298A2 (en) | Electrical water heater | |
| DE60225654T2 (en) | Heat exchanger for circulating air stoves, especially for baking | |
| EP1136764B1 (en) | Heat exchanger for gas fired condensing boiler | |
| EP2042821B1 (en) | Heat exchanger | |
| DE2200916B2 (en) | Heat exchanger | |
| EP1635127A2 (en) | Method for temperature measurement in a heat exchanger | |
| EP0551936B1 (en) | Method and apparatus for detecting the flow spud of the cooling water in a heat exchanger for determining the cleaning efficiency of cleaning bodies | |
| DE2912553A1 (en) | DEVICE FOR USE OF HEAT EXHAUST IN HEATING SYSTEMS | |
| DE3018709A1 (en) | PARALLEL BIVALENT AS AN ABSORBER HEAT PUMP AND A BOILER WORKING TO HEAT A HEAT MEDIUM | |
| EP2504120B1 (en) | Method of and device for quantitatively determining soldering agent residues | |
| EP0130361B1 (en) | Heat exchanger end palte with arrangement for cooling | |
| DE3705240C2 (en) | Process and system for controlling corrosion protection and / or mechanical cleaning of heat exchanger tubes | |
| DE102004025621B4 (en) | heat exchangers | |
| DE29811677U1 (en) | Electric instantaneous water heater | |
| DE3900943C1 (en) | Device for determining the thermal transfer between a quenching agent of a quenching device and a metallic workpiece | |
| DE1809665A1 (en) | Heater | |
| DE102016012462A1 (en) | Device for heating water | |
| DE202017102807U1 (en) | Vapor analysis system | |
| AT367195B (en) | ARRANGEMENT FOR PREHEATING RETURN WATER IN HEATING SYSTEMS | |
| AT231117B (en) | Burner system with pulsating combustion | |
| DE19804267A1 (en) | Large water boiler for creating steam and/or hot water | |
| DE3534822A1 (en) | Glass tube heat exchanger | |
| DE1237251B (en) | Burner system for pulsating combustion |
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 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
| AX | Request for extension of the european patent |
Extension state: AL BA HR MK YU |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: ROBERT BOSCH GMBH |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
| AX | Request for extension of the european patent |
Extension state: AL BA HR MK YU |
|
| AKY | No designation fees paid | ||
| 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: 20110309 |