US20150233578A1 - Method for regulating a heating unit, and heating unit - Google Patents

Method for regulating a heating unit, and heating unit Download PDF

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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
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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
Application number
US14/423,323
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English (en)
Inventor
Luis Monteiro
Marco Marques
Mauro Simoes
Gerardo Rocha
Ricardo Jorge de Sousa Vieira
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=49083654&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20150233578(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of US20150233578A1 publication Critical patent/US20150233578A1/en
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ROCHA, GERARDO, DE SOUSA VIEIRA, RICARDO JORGE, MARQUES, MARCO, MONTEIRO, LUIS, Simoes, Mauro
Abandoned legal-status Critical Current

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Classifications

    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Air-Conditioning For Vehicles (AREA)
US14/423,323 2012-08-23 2013-08-19 Method for regulating a heating unit, and heating unit Abandoned US20150233578A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102012016606.0 2012-08-23
DE102012016606.0A DE102012016606A1 (de) 2012-08-23 2012-08-23 Verfahren zur Regelung einer Heizeinrichtung und Heizeinrichtung
PCT/EP2013/067215 WO2014029721A1 (de) 2012-08-23 2013-08-19 Verfahren zur regelung einer heizeinrichtung und heizeinrichtung

Publications (1)

Publication Number Publication Date
US20150233578A1 true US20150233578A1 (en) 2015-08-20

Family

ID=49083654

Family Applications (1)

Application Number Title Priority Date Filing Date
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 (ko)
EP (1) EP2888530B1 (ko)
KR (1) KR102119376B1 (ko)
CN (1) CN104583679B (ko)
AU (1) AU2013305101B2 (ko)
DE (1) DE102012016606A1 (ko)
ES (1) ES2632942T3 (ko)
PT (1) PT2888530T (ko)
WO (1) WO2014029721A1 (ko)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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Publication number Priority date Publication date Assignee Title
EP2413047B2 (de) † 2010-07-30 2021-11-17 Grundfos Management A/S Brauchwassererwärmungseinheit
PT108703B (pt) 2015-07-17 2021-03-15 Bosch Termotecnologia, S.A. Dispositivo para aparelhos de aquecimento e processo para a operação de um dispositivo para aparelhos de aquecimento
FR3039260B1 (fr) * 2015-07-23 2017-08-25 Bosch Gmbh Robert Procede de gestion d'une chaudiere a condensation et chadiere pour la mise en oeuvre du procede
CN107816733B (zh) * 2016-09-14 2020-03-03 法雷奥热商业车辆德国有限公司 燃烧室的燃烧空气质量流保持恒定的方法及其加热装置
EP3321582A1 (de) * 2016-11-14 2018-05-16 Hubert Ziegler Vorrichtung zur regelung eines schornsteindruckes für eine feuerstelle und verfahren zur schornsteindruckkonstantregelung

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN104583679A (zh) 2015-04-29
AU2013305101B2 (en) 2017-08-24
KR102119376B1 (ko) 2020-06-09
EP2888530A1 (de) 2015-07-01
WO2014029721A1 (de) 2014-02-27
ES2632942T3 (es) 2017-09-18
KR20150045440A (ko) 2015-04-28
AU2013305101A1 (en) 2015-04-09
DE102012016606A1 (de) 2014-02-27
PT2888530T (pt) 2017-05-08
EP2888530B1 (de) 2017-04-12
CN104583679B (zh) 2017-11-17

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