US20150233578A1 - Method for regulating a heating unit, and heating unit - Google Patents
Method for regulating a heating unit, and heating unit Download PDFInfo
- Publication number
- US20150233578A1 US20150233578A1 US14/423,323 US201314423323A US2015233578A1 US 20150233578 A1 US20150233578 A1 US 20150233578A1 US 201314423323 A US201314423323 A US 201314423323A US 2015233578 A1 US2015233578 A1 US 2015233578A1
- Authority
- US
- United States
- Prior art keywords
- blower
- rotational speed
- heating unit
- volume flow
- power
- 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.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/002—Regulating air supply or draught using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/08—Regulating air supply or draught by power-assisted systems
- F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
-
- F23N2041/04—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
- F23N2225/06—Measuring pressure for determining flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
- F23N2233/08—Ventilators at the air intake with variable speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/04—Heating water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2900/00—Special features of, or arrangements for controlling combustion
- F23N2900/05181—Controlling air to fuel ratio by using a single differential pressure detector
Definitions
- the present invention relates to a method for regulating a heating unit.
- the present invention also relates to a heating unit for carrying out the method.
- Such heating units serve for heating a heating medium, heating water being generally used.
- the heating unit includes a combustion chamber in which a fuel, such as a gas for example, is burned. In the process, combustion air is supplied via a blower. The heat which is released is transferred to the heating medium in a heat exchanger.
- a correct ratio of the supplied volume of combustion air to the supplied quantity of fuel is essential for clean combustion. If too little air is supplied, the fuel cannot burn completely. This results in high pollutant emissions, particularly carbon monoxide and hydrocarbon. If too much air is supplied, the combustion is cooled and this likewise results in increased pollutant emissions.
- the quantity of supplied combustion air is usually controlled by the appropriate activation of the blower.
- the blower generally includes a blower wheel, the rotational speed of which influences a volume flow of the combustion air, i.e., the volume per unit of time.
- the volume flow may be monitored.
- This method requires a specific air guide and multiple measuring points. It is therefore relatively complex and thus cost-intensive.
- the measuring results may be falsified, for example due to soiling or due to parameter changes. There is also the problem of drift and other aging phenomena.
- German Published Patent Appln. No. 19 945 562 describes a method for monitoring and/or regulating a vehicle heating device, a rotational speed of a blower being regulated in order to control a volume flow of combustion air.
- a combustion in the combustion chamber is monitored by a pressure sensor or a sound pressure sensor.
- German Published Patent Appln. No. 10 2005 011 021 describes a method for adapting the device heating power of a blower-assisted heating device to the individual pressure losses of a fresh air/exhaust gas pipeline system, a blower rotational speed and a blower power being detected. If the ratio of the blower rotational speed to the measured blower power does not lie within a predefinable range, a fault message is output.
- An object of the present invention is to eliminate the disadvantages of the related art and in particular to make it possible to regulate the heating unit with little complexity.
- a static pressure and/or a power consumption of the blower is/are ascertained, a volume flow of the combustion air being determined on the basis of the rotational speed in conjunction with the static pressure and/or the power consumption.
- a rotational speed detection is generally provided in any case in variably activatable blowers. Therefore, only one sensor for detecting the static pressure and/or the power consumption of the blower has to be provided in addition. This may be achieved with very little effort. Such sensors are available as mass-produced articles at very little cost.
- reference values for a pressure coefficient and/or a power coefficient are ascertained as a function of a volume flow coefficient at a reference blower, the reference values being taken into account when determining the volume flow.
- Pressure coefficient H is dependent on gravity acceleration g, rotational speed N, diameter D of the blower wheel and static pressure h and is calculated according to the following formula:
- the pressure coefficient may be determined after measuring the static pressure and the rotational speed.
- Power coefficient P is dependent on power consumption W, the density of combustion air p, rotational speed N, and diameter D and is calculated according to the following formula:
- the density of the combustion air may be regarded approximately as constant. In order to increase the accuracy, however, the density may also be detected in addition.
- the diameter of the blower wheel is constant. By detecting the rotational speed and the power consumption, the power coefficient may thus be calculated easily.
- Volume flow coefficient F which is a square function of the pressure coefficient and of the power coefficient, is dependent on volume flow V, rotational speed N and diameter D and is calculated according to the following formula:
- the volume flow coefficient may be determined on the basis of reference values which have been obtained using a geometrically similar blower and which are stored for example in the form of characteristic curves. The volume flow may then be determined relatively easily therefrom based on the above formula (3). The volume flow may thus be ascertained with relatively little effort.
- the volume flow may optionally also be ascertained on two routes in parallel, i.e., on the one hand by measuring the power consumption and on the other hand by detecting the static pressure.
- the Reynolds number should be sufficiently high and influences of the viscosity should be low. However, this is generally the case.
- the power consumption of the blower is ascertained from the electrical power consumed by an electric blower motor, a degree of efficiency being taken into account. Detecting the electrical power consumption takes less effort than determining a mechanical power of the blower wheel.
- the mechanical power is dependent on the electrical power and the degree of efficiency, which depends on a load and a motor speed. This degree of efficiency may be ascertained, for example, via tests and may then be stored in a control unit.
- the relationship between electrical power consumption and mechanical power is as follows, where ⁇ e indicates the degree of efficiency, which is dependent for example on the load and on a motor speed:
- the static pressure is ascertained downstream from the blower in the flow direction. With the blower switched off, the instantaneous air pressure may then be ascertained, whereas the static pressure of the combustion air may be determined relatively accurately during operation.
- the object is also achieved by the heating unit for carrying out a method having the features of the present invention.
- This heating unit serves for heating a heating medium, in particular heating water, and has a combustion chamber into which combustion air may be fed via a blower and fuel may be fed via a feed line.
- the heating unit includes a rotational speed sensor and a pressure sensor and/or a power sensor. By determining the volume flow of the combustion air, the combustion may then be well-regulated. In particular, the supplied volume of combustion air may be adapted as a function of the quantity of supplied fuel. An optimal combustion is thus ensured.
- FIG. 1 schematically shows a heating unit of a first specific embodiment.
- FIG. 2 schematically shows a heating unit of a second specific embodiment.
- FIG. 3 schematically shows a diagram including a power coefficient characteristic curve and a pressure coefficient characteristic curve.
- FIG. 1 schematically shows a heating unit which includes a blower 1 , a burner, a heat exchanger 3 , an exhaust duct 4 and an exhaust pipe 5 .
- a blower 1 Via blower 1 , combustion air is conveyed into a combustion chamber of the heating unit. Burner 2 and heat exchanger 3 are also situated in the combustion chamber. Fuel, such as a gas for example, is conveyed to burner 2 . However, this is not shown.
- Blower 1 has a supply interface 1 . 2 for its power supply.
- heat exchanger 3 the heat released in the burner is transferred to a heating medium, such as heating water, for example.
- a volume flow is substantially influenced by a rotational speed of blower 1 .
- the rotational speed of a blower wheel is therefore detected with the aid of a rotational speed sensor 1 . 1 , which is configured, for example, as a Hall-effect sensor.
- a static pressure of the combustion air is ascertained between blower 1 and burner 2 .
- Pressure sensor 1 . 3 and rotational speed sensor 1 . 1 are connected to a control unit 6 which calculates a volume flow on the basis of the values ascertained for a rotational speed of the blower wheel and the static pressure.
- control unit 6 has a memory in which reference values for a pressure coefficient, a power coefficient and a volume flow coefficient are stored in the form of characteristic curves. These reference values have been ascertained at a reference blower and are transferrable to blowers having similar geometric dimensions. The volume flow may therefore be determined relatively easily by detecting the rotational speed and the static pressure.
- FIG. 2 shows a specific embodiment which has been modified slightly in comparison to FIG. 1 .
- Identical and corresponding elements are provided with the same reference numerals.
- a power consumption is measured via a power sensor and is provided to control unit 6 .
- the electrical power supplied to a motor of blower 1 is measured. Based on this power and the rotational speed, the control unit then calculates the volume flow conducted by blower 1 to burner 2 or into the combustion chamber.
- FIG. 3 is a diagram in which a pressure coefficient H is plotted in a first characteristic curve and a power coefficient P is plotted in a second characteristic curve, in each case over a volume flow coefficient F. These are characteristic curves which have been ascertained from reference values.
- volume flow coefficient may then be read from the characteristic curve shown in FIG. 3 , and the volume flow may be calculated therefrom based on above formula (3).
- the power coefficient may be ascertained using above formula (2) and the associated volume flow coefficient may be determined on the basis of the characteristic curve in FIG. 3 .
- the volume flow may be calculated using above formula (3).
- the method according to the present invention and the heating unit according to the present invention thus make it possible to ascertain the volume flow with little complexity. Only two sensors are required, namely a rotational speed sensor and a pressure sensor or a rotational speed sensor and a power sensor. Moreover, the calculation takes place on the basis of permanently stored values and dependencies. The determination of the volume flow is therefore subject to only a minor error rate. A clean, low-emission combustion may thus be ensured.
Abstract
Description
- The present invention relates to a method for regulating a heating unit. The present invention also relates to a heating unit for carrying out the method.
- Such heating units serve for heating a heating medium, heating water being generally used. The heating unit includes a combustion chamber in which a fuel, such as a gas for example, is burned. In the process, combustion air is supplied via a blower. The heat which is released is transferred to the heating medium in a heat exchanger.
- A correct ratio of the supplied volume of combustion air to the supplied quantity of fuel is essential for clean combustion. If too little air is supplied, the fuel cannot burn completely. This results in high pollutant emissions, particularly carbon monoxide and hydrocarbon. If too much air is supplied, the combustion is cooled and this likewise results in increased pollutant emissions.
- The quantity of supplied combustion air is usually controlled by the appropriate activation of the blower. The blower generally includes a blower wheel, the rotational speed of which influences a volume flow of the combustion air, i.e., the volume per unit of time. The volume flow may be monitored.
- It is known to ascertain the volume flow by a differential pressure measurement. For this purpose, it is provided for example in German Published Patent Appln. No. 10 159 033 to detect a pressure at two different measuring points. Since a static pressure of the combustion air is partially converted into a dynamic pressure between the two measuring points due to a difference in speed, a differential pressure may be measured between the measuring points. The volume flow may be determined therefrom in a known manner. In addition, a rotational speed of a blower wheel is measured and thus the volume flow is determined, taking into account the design of the equipment. A redundant control system is thus obtained.
- This method requires a specific air guide and multiple measuring points. It is therefore relatively complex and thus cost-intensive. The measuring results may be falsified, for example due to soiling or due to parameter changes. There is also the problem of drift and other aging phenomena.
- German Published Patent Appln. No. 19 945 562 describes a method for monitoring and/or regulating a vehicle heating device, a rotational speed of a blower being regulated in order to control a volume flow of combustion air. In the process, a combustion in the combustion chamber is monitored by a pressure sensor or a sound pressure sensor.
- German Published Patent Appln. No. 10 2005 011 021 describes a method for adapting the device heating power of a blower-assisted heating device to the individual pressure losses of a fresh air/exhaust gas pipeline system, a blower rotational speed and a blower power being detected. If the ratio of the blower rotational speed to the measured blower power does not lie within a predefinable range, a fault message is output.
- It is also known to ascertain a mass flow via heating wire sensors. However, these are relatively expensive and sensitive. Drift phenomena often occur.
- An object of the present invention is to eliminate the disadvantages of the related art and in particular to make it possible to regulate the heating unit with little complexity.
- According to the present invention, a static pressure and/or a power consumption of the blower is/are ascertained, a volume flow of the combustion air being determined on the basis of the rotational speed in conjunction with the static pressure and/or the power consumption. A rotational speed detection is generally provided in any case in variably activatable blowers. Therefore, only one sensor for detecting the static pressure and/or the power consumption of the blower has to be provided in addition. This may be achieved with very little effort. Such sensors are available as mass-produced articles at very little cost.
- Preferably, reference values for a pressure coefficient and/or a power coefficient are ascertained as a function of a volume flow coefficient at a reference blower, the reference values being taken into account when determining the volume flow. Pressure coefficient H is dependent on gravity acceleration g, rotational speed N, diameter D of the blower wheel and static pressure h and is calculated according to the following formula:
-
- Since the gravity acceleration g is a constant variable and the diameter of the blower wheel is a known, unchangeable variable, the pressure coefficient may be determined after measuring the static pressure and the rotational speed.
- Power coefficient P is dependent on power consumption W, the density of combustion air p, rotational speed N, and diameter D and is calculated according to the following formula:
-
- The density of the combustion air may be regarded approximately as constant. In order to increase the accuracy, however, the density may also be detected in addition. The diameter of the blower wheel is constant. By detecting the rotational speed and the power consumption, the power coefficient may thus be calculated easily.
- Volume flow coefficient F, which is a square function of the pressure coefficient and of the power coefficient, is dependent on volume flow V, rotational speed N and diameter D and is calculated according to the following formula:
-
- For the pressure coefficients or power coefficients calculated in each case on the basis of the measured rotational speed and the measured power consumption or the ascertained static pressure, the volume flow coefficient may be determined on the basis of reference values which have been obtained using a geometrically similar blower and which are stored for example in the form of characteristic curves. The volume flow may then be determined relatively easily therefrom based on the above formula (3). The volume flow may thus be ascertained with relatively little effort. In order to increase the operational reliability, the volume flow may optionally also be ascertained on two routes in parallel, i.e., on the one hand by measuring the power consumption and on the other hand by detecting the static pressure. In order to be able to determine the volume flow with sufficient accuracy, the Reynolds number should be sufficiently high and influences of the viscosity should be low. However, this is generally the case.
- Preferably, the power consumption of the blower is ascertained from the electrical power consumed by an electric blower motor, a degree of efficiency being taken into account. Detecting the electrical power consumption takes less effort than determining a mechanical power of the blower wheel. The mechanical power is dependent on the electrical power and the degree of efficiency, which depends on a load and a motor speed. This degree of efficiency may be ascertained, for example, via tests and may then be stored in a control unit. The relationship between electrical power consumption and mechanical power is as follows, where ηe indicates the degree of efficiency, which is dependent for example on the load and on a motor speed:
-
P mechanical=ηe ×P electrical -
ηe=ƒ(N;Lead) (4) - Preferably, the static pressure is ascertained downstream from the blower in the flow direction. With the blower switched off, the instantaneous air pressure may then be ascertained, whereas the static pressure of the combustion air may be determined relatively accurately during operation.
- The object is also achieved by the heating unit for carrying out a method having the features of the present invention.
- This heating unit serves for heating a heating medium, in particular heating water, and has a combustion chamber into which combustion air may be fed via a blower and fuel may be fed via a feed line. The heating unit includes a rotational speed sensor and a pressure sensor and/or a power sensor. By determining the volume flow of the combustion air, the combustion may then be well-regulated. In particular, the supplied volume of combustion air may be adapted as a function of the quantity of supplied fuel. An optimal combustion is thus ensured.
-
FIG. 1 schematically shows a heating unit of a first specific embodiment. -
FIG. 2 schematically shows a heating unit of a second specific embodiment. -
FIG. 3 schematically shows a diagram including a power coefficient characteristic curve and a pressure coefficient characteristic curve. -
FIG. 1 schematically shows a heating unit which includes ablower 1, a burner, aheat exchanger 3, anexhaust duct 4 and anexhaust pipe 5. Viablower 1, combustion air is conveyed into a combustion chamber of the heating unit.Burner 2 andheat exchanger 3 are also situated in the combustion chamber. Fuel, such as a gas for example, is conveyed toburner 2. However, this is not shown.Blower 1 has a supply interface 1.2 for its power supply. - In
heat exchanger 3, the heat released in the burner is transferred to a heating medium, such as heating water, for example. - For clean and low-emission combustion, it is necessary to adjust the supplied volume of combustion air to the supplied quantity of fuel. A volume flow is substantially influenced by a rotational speed of
blower 1. The rotational speed of a blower wheel is therefore detected with the aid of a rotational speed sensor 1.1, which is configured, for example, as a Hall-effect sensor. Via a pressure sensor 1.3, a static pressure of the combustion air is ascertained betweenblower 1 andburner 2. - Pressure sensor 1.3 and rotational speed sensor 1.1 are connected to a
control unit 6 which calculates a volume flow on the basis of the values ascertained for a rotational speed of the blower wheel and the static pressure. For this purpose,control unit 6 has a memory in which reference values for a pressure coefficient, a power coefficient and a volume flow coefficient are stored in the form of characteristic curves. These reference values have been ascertained at a reference blower and are transferrable to blowers having similar geometric dimensions. The volume flow may therefore be determined relatively easily by detecting the rotational speed and the static pressure. -
FIG. 2 shows a specific embodiment which has been modified slightly in comparison toFIG. 1 . Identical and corresponding elements are provided with the same reference numerals. - In addition to detecting the rotational speed of the blower wheel via rotational speed sensor 1.1, in this specific embodiment a power consumption is measured via a power sensor and is provided to control
unit 6. In the process, the electrical power supplied to a motor ofblower 1 is measured. Based on this power and the rotational speed, the control unit then calculates the volume flow conducted byblower 1 toburner 2 or into the combustion chamber. -
FIG. 3 is a diagram in which a pressure coefficient H is plotted in a first characteristic curve and a power coefficient P is plotted in a second characteristic curve, in each case over a volume flow coefficient F. These are characteristic curves which have been ascertained from reference values. - By detecting the rotational speed and the static pressure, it is possible to determine the pressure coefficient using formula (1) specified above. The volume flow coefficient may then be read from the characteristic curve shown in
FIG. 3 , and the volume flow may be calculated therefrom based on above formula (3). - In a corresponding manner, by detecting the rotational speed and the consumed power, the power coefficient may be ascertained using above formula (2) and the associated volume flow coefficient may be determined on the basis of the characteristic curve in
FIG. 3 . Hence, the volume flow may be calculated using above formula (3). - The method according to the present invention and the heating unit according to the present invention thus make it possible to ascertain the volume flow with little complexity. Only two sensors are required, namely a rotational speed sensor and a pressure sensor or a rotational speed sensor and a power sensor. Moreover, the calculation takes place on the basis of permanently stored values and dependencies. The determination of the volume flow is therefore subject to only a minor error rate. A clean, low-emission combustion may thus be ensured.
Claims (8)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102012016606.0 | 2012-08-23 | ||
DE102012016606.0A DE102012016606A1 (en) | 2012-08-23 | 2012-08-23 | Method for controlling a heating device and heating device |
PCT/EP2013/067215 WO2014029721A1 (en) | 2012-08-23 | 2013-08-19 | Method for regulating a heating device, and heating device |
Publications (1)
Publication Number | Publication Date |
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US20150233578A1 true US20150233578A1 (en) | 2015-08-20 |
Family
ID=49083654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/423,323 Abandoned US20150233578A1 (en) | 2012-08-23 | 2013-08-19 | Method for regulating a heating unit, and heating unit |
Country Status (9)
Country | Link |
---|---|
US (1) | US20150233578A1 (en) |
EP (1) | EP2888530B1 (en) |
KR (1) | KR102119376B1 (en) |
CN (1) | CN104583679B (en) |
AU (1) | AU2013305101B2 (en) |
DE (1) | DE102012016606A1 (en) |
ES (1) | ES2632942T3 (en) |
PT (1) | PT2888530T (en) |
WO (1) | WO2014029721A1 (en) |
Cited By (5)
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US20170082320A1 (en) * | 2015-09-22 | 2017-03-23 | A.O. Smith Corporation | Dual sensor combustion system |
US20180058691A1 (en) * | 2015-03-17 | 2018-03-01 | Intergas Heating Assets Bv | Device and method for mixing combustible gas and combustion air, hot water installation provided therewith, corresponding thermal mass flow sensor and method for measuring a mass flow rate of a gas flow |
US20180292106A1 (en) * | 2015-12-09 | 2018-10-11 | Fulton Group N.A., Inc. | Compact fluid heating system with high bulk heat flux using elevated heat exchanger pressure drop |
US11162680B2 (en) * | 2018-02-26 | 2021-11-02 | Eberspächer Climate Control Systems GmbH | Process for operating a fuel-operated vehicle heater and fuel-operated vehicle heater |
US11421876B2 (en) * | 2018-08-30 | 2022-08-23 | Bosch Termotecnologia S.A. | Method for regulating a heating device and heating device |
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EP2413047B2 (en) † | 2010-07-30 | 2021-11-17 | Grundfos Management A/S | Domestic water heating unit |
PT108703B (en) | 2015-07-17 | 2021-03-15 | Bosch Termotecnologia, S.A. | DEVICE FOR HEATING DEVICES AND PROCESS FOR THE OPERATION OF A DEVICE FOR HEATING DEVICES |
FR3039260B1 (en) * | 2015-07-23 | 2017-08-25 | Bosch Gmbh Robert | METHOD FOR MANAGING A CONDENSATION AND CHADIER BOILER FOR IMPLEMENTING THE METHOD |
CN107816733B (en) * | 2016-09-14 | 2020-03-03 | 法雷奥热商业车辆德国有限公司 | Method for maintaining constant combustion air mass flow in a combustion chamber and heating device therefor |
EP3321582A1 (en) * | 2016-11-14 | 2018-05-16 | Hubert Ziegler | Device for regulating a chimney pressure of a fireplace and method for constant chimney pressure controlling |
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2012
- 2012-08-23 DE DE102012016606.0A patent/DE102012016606A1/en active Pending
-
2013
- 2013-08-19 WO PCT/EP2013/067215 patent/WO2014029721A1/en active Application Filing
- 2013-08-19 PT PT137538419T patent/PT2888530T/en unknown
- 2013-08-19 AU AU2013305101A patent/AU2013305101B2/en not_active Ceased
- 2013-08-19 KR KR1020157004326A patent/KR102119376B1/en active IP Right Grant
- 2013-08-19 CN CN201380044363.9A patent/CN104583679B/en active Active
- 2013-08-19 US US14/423,323 patent/US20150233578A1/en not_active Abandoned
- 2013-08-19 ES ES13753841.9T patent/ES2632942T3/en active Active
- 2013-08-19 EP EP13753841.9A patent/EP2888530B1/en active Active
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US20180058691A1 (en) * | 2015-03-17 | 2018-03-01 | Intergas Heating Assets Bv | Device and method for mixing combustible gas and combustion air, hot water installation provided therewith, corresponding thermal mass flow sensor and method for measuring a mass flow rate of a gas flow |
US10502418B2 (en) * | 2015-03-17 | 2019-12-10 | Intergas Heating Assets B.V. | Device and method for mixing combustible gas and combustion air, hot water installation provided therewith, corresponding thermal mass flow sensor and method for measuring a mass flow rate of a gas flow |
US20170082320A1 (en) * | 2015-09-22 | 2017-03-23 | A.O. Smith Corporation | Dual sensor combustion system |
US9791172B2 (en) * | 2015-09-22 | 2017-10-17 | A. O. Smith Corporation | Dual sensor combustion system |
US20180292106A1 (en) * | 2015-12-09 | 2018-10-11 | Fulton Group N.A., Inc. | Compact fluid heating system with high bulk heat flux using elevated heat exchanger pressure drop |
US10962257B2 (en) * | 2015-12-09 | 2021-03-30 | Fulton Group N.A., Inc. | Compact fluid heating system with high bulk heat flux using elevated heat exchanger pressure drop |
US20210215392A1 (en) * | 2015-12-09 | 2021-07-15 | Fulton Group N.A., Inc. | Compact fluid heating system with high bulk heat flux using elevated heat exchanger pressure drop |
US11867427B2 (en) * | 2015-12-09 | 2024-01-09 | Fulton Group N.A., Inc. | Compact fluid heating system with high bulk heat flux using elevated heat exchanger pressure drop |
US11162680B2 (en) * | 2018-02-26 | 2021-11-02 | Eberspächer Climate Control Systems GmbH | Process for operating a fuel-operated vehicle heater and fuel-operated vehicle heater |
US11421876B2 (en) * | 2018-08-30 | 2022-08-23 | Bosch Termotecnologia S.A. | Method for regulating a heating device and heating device |
Also Published As
Publication number | Publication date |
---|---|
CN104583679B (en) | 2017-11-17 |
AU2013305101B2 (en) | 2017-08-24 |
DE102012016606A1 (en) | 2014-02-27 |
KR20150045440A (en) | 2015-04-28 |
KR102119376B1 (en) | 2020-06-09 |
PT2888530T (en) | 2017-05-08 |
ES2632942T3 (en) | 2017-09-18 |
AU2013305101A1 (en) | 2015-04-09 |
CN104583679A (en) | 2015-04-29 |
WO2014029721A1 (en) | 2014-02-27 |
EP2888530B1 (en) | 2017-04-12 |
EP2888530A1 (en) | 2015-07-01 |
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