EP0884532B1 - Procédé et dispositif associé de régulation de la température d'un fluide chauffé par un brûleur - Google Patents
Procédé et dispositif associé de régulation de la température d'un fluide chauffé par un brûleur Download PDFInfo
- Publication number
- EP0884532B1 EP0884532B1 EP98400940A EP98400940A EP0884532B1 EP 0884532 B1 EP0884532 B1 EP 0884532B1 EP 98400940 A EP98400940 A EP 98400940A EP 98400940 A EP98400940 A EP 98400940A EP 0884532 B1 EP0884532 B1 EP 0884532B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power
- burner
- temperature
- rate
- pmin
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
- F23N1/082—Regulating fuel supply conjointly with another medium, e.g. boiler water using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/18—Measuring temperature feedwater temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/19—Measuring temperature outlet temperature water heat-exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/10—Sequential burner running
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/04—Heating water
Definitions
- the present invention relates to a method and its associated device for regulation of the temperature of a fluid heated by a burner.
- the present invention relates to a method and its device associated to regulate the temperature of the water heated in an enclosure (or called "exchanger") of a water heater or a boiler by a mixture burner gas which can be at rest with zero power P, or which can operate at a power P between a non-zero minimum power Pmin and a power maximum Pmax greater than said minimum power.
- EP-A-0 222 972 proposes a method of regulation of the temperature leaving an enclosure of a fluid which has entered it at an inlet temperature less than or equal to said outlet temperature, so that this outlet temperature is adapted to it via a burner suitable for in a state of rest at zero power or in a state on in which its power is between a non-zero minimum power and a power maximum greater than said minimum power, said fluid leaving the enclosure with a non-zero draw-off rate as a function of which the power of the burner is varied, the burner operating either in continuous mode or in chopped mode depending on said flow rate.
- the invention proposes that the drawing flow be determined by calculation as a function of a reference temperature, such as the inlet temperature, at least one measured temperature, such as the output, and operating data specific to the burner, such as gas flow sent to this one.
- the process uses internal data calculated (operation of the "flow observer” type) or obtained directly using a sensor, to determine the data (the drawing flow in this case) which will serve as the basis for the passage of the operation of the burner either in continuous mode or in chopped mode, the burner power then being adapted as a function of this draw-off rate.
- This formula makes it possible to constantly adapt to the conditions of drawing, because the determination of this flow is said to be “dynamic". Indeed, it takes into not only counts the temperature variation of the fluid between the inlet and the outlet of the enclosure, but also the rate of change of the outlet temperature of the enclosure, that is to say the oscillations of this outlet temperature. In this way, the calculation allows a flow closer to reality, which obviously allows calculate as accurately as possible the power required from the burner corresponding to this flow of drawing. This solution also eliminates costly measuring devices because it uses knowledge of the behavior of the device and the burner in particular to deduce the value of the drawing flow.
- the burner will preferably change from an operating mode to the other by comparison between the drawing flow and a threshold flow to which the minimum burner power.
- the burner is operated in chopped mode with varying burner output alternately between said zero power and a power greater than or equal to the minimum power of it, so that over this time, we get a resulting average power lower than the minimum power of the burner and substantially equal to the power requested.
- the burner will be operated in continuous mode, with a power which will preferably be greater than or equal to the minimum power and which will preferably vary gradually and continuously in time as a function of said drawing flow.
- This mode of operation called “continuous mode”
- the burner output can be regulated in the time as a function of the variation in the flow rate, which in this case will always remain greater than or equal to the threshold flow.
- the power of the burner will be always adapted to the flow of this fluid, whether it is low and below the threshold flow (switch to chopped mode) or high and higher than the threshold flow (switch to mode continued).
- This process can therefore be used in all types of configuration possible in relation in particular with a water heater or a boiler.
- the invention also relates to a device for regulating the temperature of out of an enclosure of a fluid which entered it at an inlet temperature less than or equal to said outlet temperature so that this outlet temperature is adapted to it by means of a burner capable of being in a state of rest at zero power or in an on state in which its power is between a non-zero minimum power and a maximum power greater than said power minimum, said fluid leaving the enclosure with a drawing flow determined in function of which the burner output varies, characterized in that it includes a burner operating device controlled by a regulating means allowing to regulate the power P of the burner as a function of the draw-off flow, either in chopped with almost instantaneous variation in power over time, either in continuous with gradual and continuous variation in power over time.
- the regulating means preferably also include a computer allowing, on the one hand to determine by calculation the value of the drawing flow, and on the other hand to compare this flow rate Q calculated with a threshold flow rate Qs fixed so that the burner passes from chopped operating mode to continuous operating mode by comparison between the value of the calculated flow rate Q and the threshold flow rate Qs.
- the computer will preferably be initialized on ignition with a positive or zero flow and saturated at a maximum flow value, for example fixed at construction at around 20 liters / minute.
- a maximum flow value for example fixed at construction at around 20 liters / minute.
- the fluid considered will be water, preferably potable, usable in particular for sanitary use (washing, rinsing).
- Figure 1 illustrates the problem posed which the present invention.
- a curve C having for abscissa the flow of Q drawing of the fluid (typically domestic hot water) in liters / minute, and for ordered the outlet temperature Ts of said fluid from the enclosure of a water heater, typically the temperature of the water at the outlet of a tap (we disregard the temperature difference due to the passage of water in the various pipes connecting the place of the enclosure where the water is heated and the outlet of the tap where it comes out to be used).
- This first order mathematical equation determined using a computer integrated into the regulation means, has the advantage of taking into account the variation of the outlet temperature over time, in addition to the variation of the outlet temperature relative to the inlet temperature, which allows to refine the measure and have an optimized device behavior model in addition to get rid of the use of expensive and fragile mechanical parts of the type flowmeter replaced by simple temperature sensors and a computer.
- the calculator of the means of regulation which could be, without being exhaustive, an electronic circuit of the type microprocessor, DSP or microcontroller, will be initialized on ignition with a value positive or zero flow, and will be saturated at a compatible maximum flow value with the capacities of the device, ie approximately 20 liters / minute.
- the device of FIG. 2 can operate in two different modes depending on this bit rate, called “mode chopped “and” continuous mode ", as shown in the flowchart in the figure 3 and in FIGS. 4 to 6.
- the transition between the two modes can be carried out using of a known type hysteresis bistable relay integrated into regulation means 10.
- threshold flow For a certain flow called “threshold flow” and noted Qs, corresponds a power called “minimum power” and noted Pmin.
- the flow Q is greater than or equal to the threshold flow Qs (determined by measures and fixed to the construction), i.e. if the requested power Pdem, deducted of the domestic hot water drawing rate Q, is greater than or equal to the power minimum Pmin of burner 5, then it works normally, i.e. in "continuous mode" over time and progressive ( Figure 4) to supply water to a temperature Ts substantially equal to the set temperature Tcons.
- this operates in continuous mode with slaving and varies the burner power P gradually and continuously over time (preferably without bearing) between Pmin and Pmax according to the flow rate of drawing Q.
- the figure 4 illustrates well this mode of operation.
- a curve D representing the variation of the power P as a function of the drawing flow Q is shown. This shows that as long as the drawing flow Q is substantially equal to the threshold flow Qs, the power P is approximately equal to the minimum power Pmin of the burner. Once the threshold flow Qs exceeded, the power P varies continuously and gradually over time along curve D.
- the other mode of operation is the so-called "chopped" mode.
- This mode is triggered by the control means 10 when the flow Q is lower than the threshold flow Qs, that is to say when the power Pdem is less than the minimum power Pmin of the burner.
- the regulating means 10 comprising a known type of chopper, which controls the operating member 9 so that it alternately opens and closes the supply of gas mixture from burner 5, and therefore let it pass alternately from one zero power at a power P greater than or equal to the minimum power Pmin of the burner 5, and preferably equal to Pmin.
- This operation thus allows, over the entire duration during which the drawing flow Q is less than the threshold flow Qs, to obtain an average power Pmoy (power calculated by summing the integrals double the hatched areas of the curve in Figures 5 or 6) less than the minimum power Pmin of the burner and substantially equal to the required power Pdem. This therefore generates a lower heating for any drawing flow Q lower than the threshold flow Qs.
- Pmoy power calculated by summing the integrals double the hatched areas of the curve in Figures 5 or 6
- FIG. 5 represents the variation of the power P of the burner as a function of time, for a flow rate Q (variable or not over time) always lower than the threshold flow Qs.
- the power P varies so stepped or chopped between zero power and power greater than or equal to the minimum power Pmin of the burner (dotted lines).
- the value of this power P greater than or equal to the minimum power Pmin can be variable or not during all the time during which the flow Q does not vary (while remaining below the flow threshold).
- this power P greater than or equal to the minimum power Pmin is identical throughout the period during which the drawing flow is constant, and increases or decreases appreciably with the variation of the drawing flow Q.
- another solution is possible.
- the resulting average power Pmoy calculated using the sum of the double integrals of the hatched areas of figure 5 is always less than the minimum power Pmin and is substantially equal to the Pdem power requested from the burner for the draw-off rate Q considered.
- Figure 6 is a variant of Figure 5 showing the variation of the power P as a function of time, always for a drawing flow Q (variable or constant) lower than the threshold flow Qs.
- the temperature of the pulsed fluid varies too much around the set temperature because this creates a certain discomfort already encountered in the devices of the prior art (significant oscillation of the water temperature due to poor regulation).
- Gold if the burner power is varied between zero power and a power greater than or equal to the minimum power too high, there is a risk of heating too strong the fluid during certain durations. It is therefore necessary to reduce the power difference P between zero power and power greater than or equal to the minimum power of so as to reduce the differences in fluid outlet temperature.
- the regulating means 10 manages, as a function of the oscillations of the outlet temperature compared to the set temperature, the frequency of transition from zero power to power greater than or equal to the minimum power as well as the durations during which the burner remains at each of these powers, using an integrated chopper. This management allows, as this is specified above, to adapt to variations in the flow rate of draw-off Q in the time.
- the set temperature Tcons is almost reached within a few degrees (3 ° C maximum) over the entire period of the oscillations (roughly equivalent to the duration of the drawing), even for very low flow rates drawing Q.
- the temperature oscillations remain moderate (5 to 7 ° C) and are strongly attenuated by the pipeline, given their high frequency, which significantly improves the comfort of use, while avoiding having an expensive device such as a mixer, the cost of components (chopper, sensors, bistable relay or circuit PID) being very small because these are very common.
- the power variation between zero power and a power greater than or equal to the minimum power can also be done by passage through several levels (therefore without “jump” but rather in an evolutionary way continuous) for powers greater than the minimum power when the average power remains below the minimum power.
- the device may in particular comprise a circuit primary in which circulates a first fluid heated by the burner, and a circuit secondary in which a second fluid to be heated circulates, a heat exchanger allowing the second fluid to be heated using the first.
- the fluid drawn (the second fluid) is heated indirectly by the burner, but the process remains identical, i.e. the power of the burner varies according to the flow rate of the second fluid, and in particular, the regulator will operate the burner in chopped or in continuous mode depending on the value of the flow compared to a flow threshold to which the minimum power of the burner corresponds.
- the burner could work with another type of mixture fuel / oxidizer, such as an oil / air mixture.
Landscapes
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Control Of Combustion (AREA)
- Regulation And Control Of Combustion (AREA)
- Feeding And Controlling Fuel (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Water Treatment By Sorption (AREA)
- Commercial Cooking Devices (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9707230 | 1997-06-11 | ||
FR9707230A FR2764674B1 (fr) | 1997-06-11 | 1997-06-11 | Procede et dispositif associe de regulation de la temperature d'un fluide chauffe par un bruleur |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0884532A1 EP0884532A1 (fr) | 1998-12-16 |
EP0884532B1 true EP0884532B1 (fr) | 2001-11-14 |
Family
ID=9507850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98400940A Expired - Lifetime EP0884532B1 (fr) | 1997-06-11 | 1998-04-16 | Procédé et dispositif associé de régulation de la température d'un fluide chauffé par un brûleur |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0884532B1 (cs) |
AT (1) | ATE208881T1 (cs) |
CZ (1) | CZ293688B6 (cs) |
DE (1) | DE69802468T2 (cs) |
DK (1) | DK0884532T3 (cs) |
ES (1) | ES2167849T3 (cs) |
FR (1) | FR2764674B1 (cs) |
HU (1) | HU221671B1 (cs) |
PT (1) | PT884532E (cs) |
SK (1) | SK77898A3 (cs) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE60040158D1 (de) * | 1999-10-18 | 2008-10-16 | Pierre Repper | Elektronische gaskochherdregelung mit siedeanlage |
WO2007076962A1 (de) * | 2006-01-02 | 2007-07-12 | Ryll-Tech Gmbh | Heizbrenner |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR910000677B1 (ko) * | 1985-07-15 | 1991-01-31 | 도오도오 기기 가부시기가이샤 | 가스 순간식 급탕기(給湯機) |
JPH03282116A (ja) * | 1990-03-30 | 1991-12-12 | Toto Ltd | 給湯機における燃焼制御方法 |
JP3130413B2 (ja) * | 1993-09-01 | 2001-01-31 | 東京瓦斯株式会社 | 給湯器の劣化検知装置 |
JPH07145930A (ja) * | 1993-11-22 | 1995-06-06 | Harman Co Ltd | 給湯装置 |
FR2741939B1 (fr) * | 1995-12-01 | 1998-02-20 | Gaz De France | Installation de production d'eau chaude sanitaire par chaudiere a gaz et procede de regulation de la temperature d'eau chaude sanitaire dans une telle installation |
-
1997
- 1997-06-11 FR FR9707230A patent/FR2764674B1/fr not_active Expired - Fee Related
-
1998
- 1998-04-16 DE DE69802468T patent/DE69802468T2/de not_active Expired - Fee Related
- 1998-04-16 DK DK98400940T patent/DK0884532T3/da active
- 1998-04-16 ES ES98400940T patent/ES2167849T3/es not_active Expired - Lifetime
- 1998-04-16 AT AT98400940T patent/ATE208881T1/de not_active IP Right Cessation
- 1998-04-16 EP EP98400940A patent/EP0884532B1/fr not_active Expired - Lifetime
- 1998-04-16 PT PT98400940T patent/PT884532E/pt unknown
- 1998-06-10 CZ CZ19981813A patent/CZ293688B6/cs not_active IP Right Cessation
- 1998-06-10 SK SK778-98A patent/SK77898A3/sk unknown
- 1998-06-10 HU HU9801314A patent/HU221671B1/hu not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE69802468D1 (de) | 2001-12-20 |
HU221671B1 (hu) | 2002-12-28 |
ES2167849T3 (es) | 2002-05-16 |
DE69802468T2 (de) | 2002-05-02 |
CZ181398A3 (cs) | 1999-02-17 |
HUP9801314A2 (hu) | 2000-12-28 |
DK0884532T3 (da) | 2002-01-21 |
HUP9801314A3 (en) | 2002-06-28 |
HU9801314D0 (en) | 1998-08-28 |
FR2764674B1 (fr) | 1999-07-16 |
SK77898A3 (en) | 1999-04-13 |
ATE208881T1 (de) | 2001-11-15 |
EP0884532A1 (fr) | 1998-12-16 |
CZ293688B6 (cs) | 2004-07-14 |
PT884532E (pt) | 2002-04-29 |
FR2764674A1 (fr) | 1998-12-18 |
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