WO2011080110A1 - Four - Google Patents

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Publication number
WO2011080110A1
WO2011080110A1 PCT/EP2010/069954 EP2010069954W WO2011080110A1 WO 2011080110 A1 WO2011080110 A1 WO 2011080110A1 EP 2010069954 W EP2010069954 W EP 2010069954W WO 2011080110 A1 WO2011080110 A1 WO 2011080110A1
Authority
WO
WIPO (PCT)
Prior art keywords
fan speed
heater
critical
oven
instantaneous
Prior art date
Application number
PCT/EP2010/069954
Other languages
English (en)
Inventor
Ahmet Bozgeyik
Nilay Yalcinkaya
Original Assignee
Arcelik Anonim Sirketi
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 Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2011080110A1 publication Critical patent/WO2011080110A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination

Definitions

  • the present invention relates to an oven wherein energy saving is
  • the energy consumption value is aimed to be kept at low levels and measures aimed at providing energy saving are taken.
  • the heater operates uninterrupted generally until the interior temperature of the oven reaches the temperature defined by the user at the start of cooking and afterwards operates depending on the on-off cycle within the interval determined by the thermostat.
  • the energy consumption of the oven is directly proportional with the time period the heater is in the activated position.
  • the heaters are switched off for certain time periods during the cooking process or at the end of the cooking process thereby making use of the stored waste heat in the oven in order to use energy efficiently.
  • cooking programs aimed at saving energy the cooking time is prolonged and the desired cooking quality cannot be provided if the operation durations of heaters are kept lower than required.
  • Patent Document No CH678996 relates to an oven wherein the heaters are switched off at a certain time before the expiry of the cooking time in order to decrease the energy consumption.
  • the heat capacity of the oven and the elements thereof are utilized. Since the heaters operate for a shorter time period energy consumption decreases and the total cooking time is prolonged somewhat.
  • Patent Document No. EP1213542 in an oven, the heaters are switched off until the interior temperature of the oven decreases to a predetermined temperature when stable conditions have been obtained at the defined cooking temperature.
  • the heaters are operated again for reaching the stable set temperature once again.
  • the waste heat of the oven is utilized until reaching the predetermined low temperature and the energy consumption of the oven decreases. It is recommended that the predetermined low temperature is around 100 °C when the heaters are in the switched off position. The reason why this value is selected for the low set temperature when the heaters restart operating is that water evaporates at around 100 °C and thus cooking can continue.
  • the aim of the present invention is the realization of an oven wherein the energy consumption during the cooking process is decreased such that the cooking quality is not affected adversely.
  • the heater comprises a sensor that detects the instantaneous fan speed and a control unit that provides the heater to be reactivated again after being deactivated at the end of the preheating duration according to the data transmitted by the sensor.
  • the heater operates until the temperature defined by the user at the start of the cooking process is reached and afterwards operates during a preheating duration by performing the on-off cycle within the interval determined by the thermostat. Through this duration, some amount of heat is accumulated on all the elements of the oven.
  • the heater is switched off and the accumulated waste heat is utilized. The waste heat is utilized in the most efficient way without foregoing the cooking quality by switching off the heater at the end of the preheating duration and switching on again according to the fan speed. Thus, energy saving is obtained.
  • the control unit compares the instantaneous fan speed detected and transmitted by the sensor with the critical fan speed predetermined by the producer and switches on the heater, which is switched off at the end of preheating duration, when the instantaneous fan speed is smaller than the critical fan speed.
  • the critical fan speed is a parameter determined by the producer by experimental studies based on the principle of making the most use of the cooking chamber waste heat without adversely affecting the cooking quality.
  • energy consumption is decreased by keeping the heater switched off as long as possible and on the other hand the heater is reactivated again according to the critical fan speed, providing the cooking quality not to be adversely affected.
  • Comparison of the instantaneous fan speed with the critical fan speed is carried out for a critical time period predetermined by the producer.
  • the control unit reactivates the heater deactivated at the end of the preheating duration at the end of the critical time period.
  • control unit calculates the difference between the instantaneous fan speeds measured by the sensor at certain time intervals and determines the amount of change in the fan speed and compares the amount of change in the fan speed with the amount of change in the critical fan speed.
  • the control unit provides the heater deactivated at the end of the preheating duration to be reactivated.
  • control unit In another embodiment of the present invention, the control unit
  • control unit When the fan speed ratio is smaller than the critical fan speed ratio predetermined by the producer, the control unit provides the heater deactivated at the end of the preheating duration to be reactivated.
  • the heater which is deactivated at the end of the preheating duration is reactivated according to fan speed.
  • the waste heat of the cooking chamber is utilized to the maximum and thus energy saving is obtained.
  • Figure 1 - is the sideways schematic view of an oven.
  • Figure 2 - is the graphic showing the change in fan speed with respect to time in an oven.
  • the oven (1 ) comprises a body (2), a cooking chamber (3) disposed in the body (2), wherein foods to be cooked are placed, a door (4) providing access to the cooking chamber (3), a heater (5) providing the air in the cooking chamber (3) to be heated, a thermostat (8) controlling the operation of the heater (5), a fan (6) moving the air heated by the heater (5), a motor (7) providing the drive of the fan (6), and a sensor (9) that detects the instantaneous fan speed (N) ( Figure 1 ).
  • the oven (1 ) of the present invention furthermore comprises a control unit (10) that provides the heater (5) to operate by performing the on-off cycle within the time interval determined by the thermostat (8) for a preheating duration (tp) predetermined by the producer after the cooking chamber (3) reaches a first temperature (T1) defined by the user at the start of the cooking process, that provides the heater (5) to be deactivated at the end of the preheating duration (tp) and that determines the time when the heater (5) is reactivated by using the instantaneous fan speed (N) data transmitted by the sensor (9).
  • a control unit (10) that provides the heater (5) to operate by performing the on-off cycle within the time interval determined by the thermostat (8) for a preheating duration (tp) predetermined by the producer after the cooking chamber (3) reaches a first temperature (T1) defined by the user at the start of the cooking process, that provides the heater (5) to be deactivated at the end of the preheating duration (tp) and that determines the time when the heater (5)
  • the cooking chamber (3) reaches the first temperature (T1) defined by the user.
  • the temperature of the cooking chamber (3) is provided to be stabilized by the heater (5) being operated by performing the on-off cycle within the interval determined by the thermostat (8) for a preheating duration (tp).
  • the heater (5) is deactivated.
  • the thermal inertia is utilized that accumulates on the cooking chamber (3) in the course of the preheating duration (tp) which is the longest time period the heater (5) is operated through the entire cooking process duration.
  • the time when the heater (5) is reactivated after the preheating duration (tp) is determined by the control unit (10).
  • the instantaneous fan speed (N) measured by the sensor (9) is transmitted to the control unit (10).
  • the control unit (10) provides the heater (5) to be reactivated depending on the instantaneous fan speed (N). Consequently, the thermal inertia
  • control unit (10) compares the instantaneous fan speed (N) with the critical fan speed (Nc)
  • the critical fan speed (Nc) is determined by the experimental studies performed by the producer.
  • the critical fan speed (Nc) is determined such that maximum utilization is maintained from the thermal inertia of the cooking chamber (3) and the cooking quality is not adversely affected by the time period the heater (5) is kept deactivated.
  • the time period the heater (5) stays deactivated is kept at an optimum level that does not decrease the cooking quality.
  • the control unit (10) continues comparing the instantaneous fan speed (N) with the critical fan speed (Nc) for a critical time period (tc) predetermined by the producer and if the fan speed (N) is greater than the critical fan speed (Nc) during the critical time period (tc), provides the heater (5) to be reactivated at the end of the critical time period (tc).
  • the control unit (10) starts counting the critical time period (tc) after stopping the heater (5) at the end of the preheating duration (tp). If the instantaneous fan speed (N) is not smaller than the critical fan speed (Nc) during the critical time period (tc), the heater (5) is activated at the end of the critical time period (tc).
  • control unit (10) In another embodiment of the present invention, the control unit (10)
  • the control unit (10) determines the amount of change in the fan speed (DN) by calculating the difference between two consecutive instantaneous fan speeds (N) and when the amount of change in the fan speed (DN) is greater than the amount of change in the critical fan speed (DNc) predetermined by the producer, provides the heater (5) to be reactivated.
  • the sensor (9) transmits the instantaneous fan speed (N) to the control unit (10) at predetermined time intervals, for example at every n second.
  • the heater (5) is activated when the amount of change in the fan speed (DN) is greater than the amount of change in the critical fan speed (DNc).
  • the control unit (10) is provided to determine the time when the heater (5) is activated more precisely and the amount of saved energy is increased.
  • control unit (10) In another embodiment of the present invention, the control unit (10)
  • RN determines the fan speed ratio (RN) by calculating the ratio of two consecutive instantaneous fan speeds (N) to one another and when the fan speed ratio (RN) is smaller than the critical fan speed ratio (RNc) predetermined by the producer, provides the heater (5) to be reactivated.
  • the senor (9) detecting the instantaneous fan speed (N) is of the Hall effect type.
  • control unit (10) provides the

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

La présente invention porte sur un four (1) qui comporte un corps (2), une chambre de cuisson (3) disposée dans le corps (2) et dans laquelle les aliments à cuire sont placés, une porte (4) fournissant un accès à la chambre de cuisson (3), un élément chauffant (5) qui amène l'air dans la chambre de cuisson (3) à être chauffé, un thermostat (8) qui commande le fonctionnement de l'élément chauffant (5), un ventilateur (6) qui déplace l'air chauffé par l'élément chauffant (5), un moteur (7) qui fournit l'entraînement du ventilateur (6) et un capteur (9) qui détecte la vitesse instantanée du ventilateur (N).
PCT/EP2010/069954 2009-12-31 2010-12-16 Four WO2011080110A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TRA2009/10102 2009-12-31
TR200910102 2009-12-31

Publications (1)

Publication Number Publication Date
WO2011080110A1 true WO2011080110A1 (fr) 2011-07-07

Family

ID=43640471

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/069954 WO2011080110A1 (fr) 2009-12-31 2010-12-16 Four

Country Status (1)

Country Link
WO (1) WO2011080110A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2604929A1 (fr) * 2011-12-16 2013-06-19 Electrolux Professional S.p.A. Équipement de cuisson et procédé de détection des conditions de fonctionnement d'un équipement de cuisson
AU2012203895B2 (en) * 2011-07-12 2016-04-21 Furphy's Foundry Sales Pty Ltd Barbeque control system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH678996A5 (en) 1989-05-31 1991-11-29 Electrolux Ag Procedure and device for heating food in oven - where oven is automatically switched off shortly before completion of cooking and heat is recovered while allowing temp. to fall
JPH0949637A (ja) * 1995-08-08 1997-02-18 Hitachi Home Tec Ltd 加熱調理器
WO2001053797A1 (fr) * 2000-01-20 2001-07-26 Convotherm Elektrogeräte GmbH Procede pour determiner la proportion d'un constituant gazeux dans un melange gazeux
EP1213542A2 (fr) 2000-11-10 2002-06-12 Aktiebolaget Electrolux Dispositif de commande de la consommation d'énergie d'un four
EP1342414A1 (fr) * 2002-03-07 2003-09-10 eloma GmbH Grossküchentechnik Procédé de détection de l' humidité dans un dispositif de traitement et préparation de produits alimentaires, et dispositif de traitement et préparation de produits alimentaires
US6772752B1 (en) * 2003-04-10 2004-08-10 Maytag Corporation Cooling system airflow sensor for a cooking appliance

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH678996A5 (en) 1989-05-31 1991-11-29 Electrolux Ag Procedure and device for heating food in oven - where oven is automatically switched off shortly before completion of cooking and heat is recovered while allowing temp. to fall
JPH0949637A (ja) * 1995-08-08 1997-02-18 Hitachi Home Tec Ltd 加熱調理器
WO2001053797A1 (fr) * 2000-01-20 2001-07-26 Convotherm Elektrogeräte GmbH Procede pour determiner la proportion d'un constituant gazeux dans un melange gazeux
EP1213542A2 (fr) 2000-11-10 2002-06-12 Aktiebolaget Electrolux Dispositif de commande de la consommation d'énergie d'un four
EP1342414A1 (fr) * 2002-03-07 2003-09-10 eloma GmbH Grossküchentechnik Procédé de détection de l' humidité dans un dispositif de traitement et préparation de produits alimentaires, et dispositif de traitement et préparation de produits alimentaires
US6772752B1 (en) * 2003-04-10 2004-08-10 Maytag Corporation Cooling system airflow sensor for a cooking appliance

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199717, Derwent World Patents Index; AN 1997-189088, XP002633135 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2012203895B2 (en) * 2011-07-12 2016-04-21 Furphy's Foundry Sales Pty Ltd Barbeque control system
EP2604929A1 (fr) * 2011-12-16 2013-06-19 Electrolux Professional S.p.A. Équipement de cuisson et procédé de détection des conditions de fonctionnement d'un équipement de cuisson
US20130153562A1 (en) * 2011-12-16 2013-06-20 Electrolux Professional S.P.A. Cooking equipment and a method of detecting operating conditions of a cooking equipment
US9267692B2 (en) * 2011-12-16 2016-02-23 Electrolux Professional S.P.A. Cooking equipment and a method of detecting operating conditions of a cooking equipment

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