EP2345848A1 - Anordnung in wärmespeicherndem Kamin - Google Patents

Anordnung in wärmespeicherndem Kamin Download PDF

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Publication number
EP2345848A1
EP2345848A1 EP11150911A EP11150911A EP2345848A1 EP 2345848 A1 EP2345848 A1 EP 2345848A1 EP 11150911 A EP11150911 A EP 11150911A EP 11150911 A EP11150911 A EP 11150911A EP 2345848 A1 EP2345848 A1 EP 2345848A1
Authority
EP
European Patent Office
Prior art keywords
fireplace
temperature
arrangement
heat
set value
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.)
Granted
Application number
EP11150911A
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English (en)
French (fr)
Other versions
EP2345848A9 (de
EP2345848B1 (de
Inventor
Martti Purtola
Jari Sutinen
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.)
Tulikivi Oyj
Original Assignee
Tulikivi Oyj
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 Tulikivi Oyj filed Critical Tulikivi Oyj
Publication of EP2345848A1 publication Critical patent/EP2345848A1/de
Publication of EP2345848A9 publication Critical patent/EP2345848A9/de
Application granted granted Critical
Publication of EP2345848B1 publication Critical patent/EP2345848B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00—Stoves or ranges
    • F24B1/18—Stoves with open fires, e.g. fireplaces
    • F24B1/185—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion
    • F24B1/187—Condition responsive controls for regulating combustion 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00—Stoves or ranges
    • F24B1/20—Ranges
    • F24B1/24—Ranges with built-in masses for heat storage or heat insulation

Definitions

  • the invention relates to an arrangement in a heat-accumulating fireplace, the arrangement comprising a measuring device adapted to react to temperature changes, arranged into the heat-accumulating wall structure of the fireplace, and intended to control the use of the fireplace.
  • Publication AT 390832 discloses an arrangement of this type comprising a temperature sensor adapted to adjust the amount of combustion air entering the fireplace.
  • the purpose of the arrangement is to close air supply automatically when a predetermined temperature has been reached in the fireplace. Air supply is closed on the presumption that said predetermined temperature is only reached after a predetermined amount of fuel has nearly burned out.
  • a problem with this prior-art arrangement is that when adding fuel more than said predetermined amount, air supply needs to be opened either manually or by other means. Thus, overheating the fireplace is possible in this arrangement. If air supply is not opened, there is a risk of carbon monoxide poisoning.
  • the object of the invention is to provide a novel arrangement for the use of a heat-accumulating fireplace, which arrangement facilitates the use of the fireplace and makes the use of the fireplace more energy efficient. With the arrangement, it is also possible to avoid overheating the fireplace and the thus caused early damaging of the fireplace.
  • the invention is characterised in that the arrangement comprises an electric calculation unit coupled to a display unit arranged to provide data showing the heat accumulation status of the fireplace in response to temperature changes detected by a measuring device and to inform the user of the fireplace, when the fireplace has reached maximum and correct heat accumulation, that there is a risk of overheating the fireplace if fuel is added.
  • the heat-accumulating structure preferably comprises a massive heat-accumulating inner structure and a separate outer shell structure, to which the measuring device is arranged. Mounting the measuring device in said location is easy. Even though the measuring device is mounted in the outer shell structure, it reacts quite quickly to temperature changes of the inner structure. The solution indicates the risk of overheating of the inner structures of the fireplace even if temperature changes are monitored in a location of the fireplace not subject to high heat loads. Since the measuring device is mounted in the outer shell structure, it reacts to the temperature surrounding the fireplace - especially if the outer shell structure is separate and at a distance from the inner structure - and the system can be used to show a recommended re-heating time.
  • the air gap Between the outer shell structure and inner structure, there is preferably an air gap, whereby the measuring device mounted in the outer shell is quite quickly able to react to temperature changes in the inner structure.
  • the air gap does not have any insulating material, because this would greatly slow down and hamper the ability of the measuring device to react to the temperature changes in the inner structure.
  • the arrangement of the invention provides the advantage that it greatly facilitates the use of the fireplace, which is why no experience is required of a user to achieve maximum accumulation to the fireplace without the risk of overheating it in such a manner that its durability would suffer.
  • Figure 1 shows an arrangement according to the invention, comprising a heat-accumulating fireplace having a measuring device 1 and calculation unit 2 coupled to a display unit 3 arranged thereto, the display unit being arranged to display the heat accumulation status of the fireplace.
  • the term measuring device does not in itself include the calculation unit and/or display unit.
  • the fireplace comprises a massive stone structure that forms a heat-accumulating mass.
  • the stone structure comprises a massive inner stone structure 4 and a surrounding outer shell structure 5.
  • the outer shell structure 5 is separate and at a distance from the inner stone structure 4.
  • the double-layer structure of the fireplace is presented in Figure 1 that shows a partly open fireplace and in Figure 2 that shows a detail of the opened fireplace.
  • the measuring device 1 is a temperature sensor that is arranged in the outer shell structure 5 and measures the temperature Tmv of the outer shell structure 5. Because the temperature of the outer shell of the fireplace varies depending on which part of the outer shell is monitored, the measuring device 1 provides information on the outer shell temperature only in the location where the measuring device is installed. Due to the fact that at the location of the measuring device 1, between the outer shell structure 5 and inner stone structure 4, there is no insulation material, such as wool which is usually installed between the outer and inner shells of fireplaces having an double-layer structure, the measuring device easily reacts to temperature changes in the inner stone structure 4. This makes it possible that by measuring and monitoring the temperature Tmv of the outer stone structure 5, quite reliable information is also obtained of the amount of heat in the inner stone structure 4.
  • Figure 3 shows a temperature curve of a successfully accumulated fireplace, that is, of a heat-accumulating structure of a correctly heated and almost fully accumulated fireplace, as a function of time.
  • the temperature curve has been obtained by measuring the temperature Tmv of the outer stone structure 5 as a function of time.
  • the temperature curve drawn with a uniform line has been obtained by heating the fireplace according to the instructions from the display unit 3.
  • Figure 4 shows the display unit 3 of Figure 1 in more detail.
  • the display unit 3 indicates with graphical data the heat accumulation status of the fireplace, that is, the amount of heat therein.
  • the display unit 3 is controlled by the calculation unit 2 that in turn is arranged to obtain data on the measuring results of the measuring device 1.
  • the graphical data is implemented by means of eight symbols 7 that may alternatively be light or dark depending on the temperature measured by the measuring device 1, which thus correlates with the heat accumulation status of the fireplace. If the temperature Tmv measured by the measuring device 1 is 20°C, all symbols 7 are light. If the temperature Tmv measured by the measuring device 1 is 30°C, one symbol 7 is dark; if the measured temperature Tmv is 40°C, two symbols are dark, etc. In the case of Figure 4 , four symbols are dark, so the temperature Tmv measured from the fireplace is at least 60°C, but below 70°C, because the fifth symbol is not dark. If all eight symbols 7 are dark, a temperature of at least 100°C has been measured from the fireplace.
  • FIG. 5 shows the operation of the arrangement.
  • temperature is measured continuously in each stage.
  • the calculation unit 2 of Figure 1 is programmed to display in a field 9, or instruction field, of the display unit 3 "DO NOT ADD WOOD," if the measuring device 1 measures a temperature Tmv that exceeds 70°C (see Figure 5 , step 54).
  • Tmv a temperature exceeds 70°C
  • five symbols 7 are dark.
  • the person heating the fireplace receives this notice, s/he does not add wood, but allows the wood in the fireplace to burn out, after which s/he may close the damper (not shown) of the fireplace. Because the temperature of the inner structure 4 of the fireplace is higher than that of the outer stone structure 5, temperature measured from the fireplace rises even if no wood is added.
  • the figure shows that in the example, the temperature rises to the maximum value Tmvmax of 100°C. After about five hours from starting the heating, the fireplace is allowed to cool (see Figure 3 ). Cooling is slow, because the heat-accumulating mass of the fireplace is great.
  • a field 8 of the display unit 3 indicates the measured temperature Tmv as a numerical value and in °C.
  • the calculation unit 2 which is a data processor and display unit 3, is programmed to display on the instruction field 9 of the display unit "HEATING CAN BE RESTARTED," when the temperature Tmv measured from the fireplace has decreased to approximately 40°C (see Figure 5 , step 57). In the case of Figure 3 , this takes place approximately 22 hours after starting the heating.
  • the display unit 3 is adapted to provide said notification at a time and temperature, at which the fireplace is able to receive lots of heat, i.e., it has cooled down substantially, however, before the fireplace has cooled so much that it cannot in practice emit much heat into the environment. When the fireplace is not fully cooled, it is also very easy to light it up again.
  • the temperature, at which it is recommended to start heating again, may be referred to as a second temperature set value T2sv.
  • T2sv The temperature, at which it is recommended to start heating again, may be referred to as a second temperature set value T2sv.
  • Its size is selected to be 30 to 50°C depending on how even a heat emission is required of the fireplace.
  • a high value e.g. 50°C
  • a low value e.g. 30°C.
  • the display unit 3 displays "DO NOT ADD WOOD" (see Figure 5 , step 54).
  • the temperature set value T1sv and safety margin ⁇ T1 must be defined and set in the arrangement (see Figure 5 , step 51) so that the arrangement knows at which temperature Tmv to warn about adding wood.
  • the sizes of the temperature set value T1 sv and safety margin ⁇ T1 depend mainly on the structure, mass and material of the fireplace.
  • the first safety margin ⁇ T1 may be defined by monitoring the rate of temperature increase.
  • the increase rate may easily be defined by comparing the prevailing temperature with a value measured earlier and by checking the temperature curve of Figure 3 .
  • the rate of temperature increase is fireplace-specific and depends mainly on the type, manufacturing material and mass of the fireplace. Temperature increase may be foreseen by multiplying the rate of temperature increase (degrees / time unit) by a fireplace-specific coefficient (time). The coefficient(s) may be determined by experimentation.
  • the system could also be self-learning in such a manner, for instance, that during the learning stage, as a specific temperature is exceeded, the processor provides a signal not to add more wood (see the above "DO NOT ADD WOOD"), after which the processor 1) defines a gradient, 2) observes how much the temperature will rise from this, and 3) stores the data into a memory.
  • the processor may 1) monitor the gradient, 2) on the basis of the gradient, fetch from the stored history data information on how much the temperature will rise from the present, and 3) subtract the temperature increase prediction from a "safe" maximum temperature. When it is estimated on the basis of the gradient and history that a safe maximum temperature will be reached, a signal is provided not to add more wood ("DO NOT ADD WOOD").
  • the dashed line in Figure 3 shows a situation, in which a furnace-full of wood has been added into the fireplace - against the instructions of the display unit 3 - when the temperature of the outer shell structure is 90°C. Adding wood increases the temperature of the outer shell structure 5 to Tmvmax 120°C. This is 20°C above the temperature that the fireplace can endure for certain, because the curve marked by a uniform line in Figure 3 represents the correct maximum heat accumulation that indicates 100°C as the maximum temperature Tmvmax.
  • the condition of the fireplace should be checked and necessary maintenance work done to it, if it has been overheated repeatedly.
  • the arrangement calculates cumulatively the overheating time, tl, that is, how long the fireplace has been overheated (see Figure 5 , step 59).
  • a field 10 in the display unit 3 shows the overheating time in hours. Calculating the overheating time tl will be started when the measured temperature Tmv is higher by a second safety margin ⁇ T2 than the temperature set value T1sv (see Figure 5 , steps 55, 58).
  • the display unit 3 of the arrangement displays in a field 11 "CHECK" and/or the arrangement emits an audio signal (see Figure 5 , steps 59, 60).
  • the value of the safety margin ⁇ T2 and especially the temperature set value T1sv depend on the location of the measuring device 1 and must be selected accordingly.
  • the location where the measuring device is mounted represents the fireplace only when the shape of the heating curve is examined; the location does not represent absolute temperature values.
  • a certain temperature indicates a general overheating, even though in another case a temperature higher than this does not necessarily indicate overheating.
  • the arrangement is switched on and off using a button 12 in the display unit 3; the required temperature set values T1sv and T2sv may be programmed with buttons 13 and 15 (reset button).
  • the programming is not described in detail herein, because it does not require any special expertise.
  • the arrangement goes into learning state by pressing a button 14 of the display unit (see Figure 4 , and Figure 6 , step 61).
  • the purpose of the learning state is to define a suitable temperature set value T1sv. This is done according to Figure 6 , step 62, in such a manner that the person heating the fireplace attempts to heat it correctly to accumulate as high an amount of heat as possible.
  • Correct heating means that the fireplace is heated in a conventional manner with wood containing a conventional heat value without overheating it in such a manner that its strength suffers.
  • the instructions for use of the manufacturer assist in correct heating. A person skilled in the art is familiar with correct heating.
  • the success of the heating is evaluated by measuring the temperature and comparing the measured temperatures with those allowed that do not overheat the fireplace (see Figure 6 , step 63).
  • the temperature set value T1 sv is selected to be 90°C minus the safety margin. If the safety margin is selected to be 15°C, the temperature set value becomes 75°C.
  • the temperature set value T1sv is fetched from the memory 17 of the arrangement (see Figure 6 , step 65). A person skilled in the art is capable of evaluating the success of the heating.
  • the button 15 in the display unit is a reset button that is used when programming the arrangement.
  • a few temperature set values and safety margins that form different programs may be stored into the arrangement.
  • One program provides a very even heat emission, whereas another program provides a more uneven heat emission.
  • the former program requires that the re-heating of the fireplace be done relatively often.
  • the required program may be selected by pressing a menu button 16 of the display unit 3.
  • the temperature set values, safety margins sizes, and counter limit value may also be selected specifically for each fireplace. Instead of firewood, it is possible to use some other fuel, such as pellets, to heat the fireplace.
  • the calculation unit is described as a programmed data processor, but it may also be implemented by dedicated logic.
  • the amount of information provided by the display unit 3 may vary, as may the presentation of the information (graphical, numeric, audio, or light information, etc.).
  • the fireplace does not necessarily need to comprise an outer shell separate from the inner stone structure, even though this is highly recommended.
  • the manufacturing material of the fireplace does not need to be stone, but may be some other material.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Control Of Temperature (AREA)
EP11150911.3A 2010-01-15 2011-01-14 Anordnung in wärmespeicherndem Kamin Active EP2345848B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20105029A FI122198B (fi) 2010-01-15 2010-01-15 Järjestely varaavassa tulisijassa

Publications (3)

Publication Number Publication Date
EP2345848A1 true EP2345848A1 (de) 2011-07-20
EP2345848A9 EP2345848A9 (de) 2011-10-05
EP2345848B1 EP2345848B1 (de) 2016-04-06

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EP11150911.3A Active EP2345848B1 (de) 2010-01-15 2011-01-14 Anordnung in wärmespeicherndem Kamin

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EP (1) EP2345848B1 (de)
FI (1) FI122198B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015104021A1 (en) * 2014-01-07 2015-07-16 Aduro A/S Wood-burning stove combustion monitoring system
EP2682674A3 (de) * 2012-07-03 2015-09-23 Hans Matthiessen Verfahren zum Betreiben einer Brennstelle und Brennstelle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712095A (en) * 1986-08-01 1987-12-08 Georgis Ii Paul F Remote temperature alarm for stoves
US4901059A (en) * 1988-12-27 1990-02-13 Amann Matthew J Overheat warning for wood stoves
AT390832B (de) 1987-03-16 1990-07-10 Kloss Erich Kachelgrundofen
EP1376014A2 (de) * 2002-06-20 2004-01-02 Nunnanlahden Uuni Oy Ofen nach Art eines Kamins
US20070289589A1 (en) * 2006-06-15 2007-12-20 Mcfarland Daniel T Intelligent and adaptive control system and method for wood burning stove

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712095A (en) * 1986-08-01 1987-12-08 Georgis Ii Paul F Remote temperature alarm for stoves
AT390832B (de) 1987-03-16 1990-07-10 Kloss Erich Kachelgrundofen
US4901059A (en) * 1988-12-27 1990-02-13 Amann Matthew J Overheat warning for wood stoves
EP1376014A2 (de) * 2002-06-20 2004-01-02 Nunnanlahden Uuni Oy Ofen nach Art eines Kamins
US20070289589A1 (en) * 2006-06-15 2007-12-20 Mcfarland Daniel T Intelligent and adaptive control system and method for wood burning stove

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2682674A3 (de) * 2012-07-03 2015-09-23 Hans Matthiessen Verfahren zum Betreiben einer Brennstelle und Brennstelle
WO2015104021A1 (en) * 2014-01-07 2015-07-16 Aduro A/S Wood-burning stove combustion monitoring system

Also Published As

Publication number Publication date
EP2345848A9 (de) 2011-10-05
FI20105029A (fi) 2011-07-16
FI20105029A0 (fi) 2010-01-15
FI122198B (fi) 2011-10-14
EP2345848B1 (de) 2016-04-06

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