EP2110609B1 - Kitchen hood recovering a quantity of heat - Google Patents

Kitchen hood recovering a quantity of heat Download PDF

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Publication number
EP2110609B1
EP2110609B1 EP09004556.8A EP09004556A EP2110609B1 EP 2110609 B1 EP2110609 B1 EP 2110609B1 EP 09004556 A EP09004556 A EP 09004556A EP 2110609 B1 EP2110609 B1 EP 2110609B1
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EP
European Patent Office
Prior art keywords
heat exchanger
hood
internal
recovery
gas mixture
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.)
Active
Application number
EP09004556.8A
Other languages
German (de)
English (en)
French (fr)
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EP2110609A3 (en
EP2110609A2 (en
Inventor
Oreste Bottaro
Mario Cipriani
Perry King
Santiago Miranda
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.)
Faber SpA
Original Assignee
Faber SpA
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Publication date
Application filed by Faber SpA filed Critical Faber SpA
Priority to PL09004556T priority Critical patent/PL2110609T3/pl
Publication of EP2110609A2 publication Critical patent/EP2110609A2/en
Publication of EP2110609A3 publication Critical patent/EP2110609A3/en
Application granted granted Critical
Publication of EP2110609B1 publication Critical patent/EP2110609B1/en
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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
    • F24C15/20—Removing cooking fumes

Definitions

  • the present invention relates to a kitchen hood for recovering a heat quantity contained in a gas mixture which would otherwise be dispersed by the hood when this is in operation, in accordance with the introduction to the main claim.
  • a kitchen hood according to the preamble of claim 1 is disclosed by document US-A-4122834 .
  • Another relevant document represents WO2007068751A .
  • the object of the present invention is therefore to provide a kitchen extraction hood for recovering a heat quantity contained in a gas mixture which would otherwise be dispersed by the hood when in operation, comprising a device in which a fluid is made to undergo a thermodynamic cycle such that by changing its state it absorbs heat from the hot moist gas mixture at a determined temperature, and yields heat, again mainly by changing its state, at higher temperatures to a different gas mixture.
  • this shows a hood 1 for recovering a heat quantity contained in a gas mixture, with a housing 1a which comprises an internal heat exchanger 2 connected by a conduit 3 to a throttling device 4a, itself connected to a recovery heat exchanger 4.
  • a gas mixture means a mixture comprising air and possibly other gases, suspended aerosols, oily substances and water vapour.
  • the conduit 3 comprises recovery valve means 3a for intercepting the flow of a vector fluid, preferably represented by a two-way solenoid valve, to allow or prohibit the passage of the vector fluid between the heat exchangers 2, 4.
  • these recovery valve means 3a for intercepting the flow are located between the throttling device 4a and the internal heat exchanger 2.
  • the recovery heat exchanger 4 comprises a turn-down circuit 4b comprising for example control valve means 4c, preferably represented by a two-way solenoid valve, for regulating the turn-down circuit 4b.
  • the recovery heat exchanger 4 is connected via a conduit 5 to compression means 6.
  • these compression means 6 are positioned outside the hood 1.
  • the compression means 6 are then connected via a further conduit 7 to the internal heat exchanger 2, such as to close the thermodynamic circuit of the invention.
  • a conventional vector fluid flows through the heat exchangers 2, 4, through the throttling device 4a and through the compression means 6 to form a thermodynamic cycle with compression of the saturated vapours of the vector fluid in the manner described hereinafter.
  • the figure shows an example which does not fully fall under the scope of this invention showing a first fan 8, or suction fan, being positioned in proximity to the recovery heat exchanger 4.
  • this suction fan 8 is that conventionally provided in extraction hoods.
  • the suction fan 8 is positioned either above or below the recovery heat exchanger 4.
  • this example further shows a second fan 9, or internal fan, being positioned in proximity to the internal heat exchanger 2.
  • the internal fan 9 is positioned either below or above the internal heat exchanger 2.
  • the internal fan 9 is positioned downstream of the internal heat exchanger 2 (with respect to the gas flow) the gas flow velocity distribution over the heat exchanger 2 is improved.
  • first apertures 15 are provided to convey a gas mixture 11 withdrawn from above cooking hobs to the recovery heat exchanger 4, and second apertures 16 for expelling to the external environment the gas mixture 12 which has passed through the recovery heat exchanger 4.
  • the gas mixture 11 withdrawn from above the cooking hobs is that of the internal environment itself if the cooking hobs are not functioning, whereas if they are functioning it also contains the products of combustion of the cooking hobs themselves.
  • the internal environment means the environment containing the hood, whereas the external environment is the external air.
  • one or more filtration devices for example oil removal filters, not shown in the figures for simplicity, are provided to ensure normal operability of the extraction hood.
  • third apertures 17 are provided to convey a gas mixture 13 from the internal environment to the internal heat exchanger 2, and fourth apertures 18 to expel that gas mixture 14 which has passed through the internal heat exchanger 2, to the outside of the hood, but still into the internal environment where the hood is located,.
  • At least one internal baffle 24 is provided to maintain the gas flow entering through the apertures 15 and leaving from the apertures 16 separate from the gas flow entering through the apertures 17 and leaving from the apertures 18.
  • the hood 1 of the invention comprises only one fan both for expelling and for treating the gas mixtures.
  • a double suction centrifugal fan arranged transversely to the housing 1a can be used.
  • the rear part of the fan is used for treating the gas mixture 11 while the front part is used for the gas mixture 13.
  • the flow thus generated is divided into two by a separator baffle which extends into the fan volute.
  • the first gas flow is expelled through the second apertures 16 while the second gas flow is expelled through the fourth apertures 18.
  • one or more filtration devices are provided between the internal heat exchanger 2 and the third apertures 17.
  • one or more filtration devices are provided between the internal heat exchanger 2 and the fourth apertures 18.
  • the internal heat exchanger 2, the compression means 6 and the second fan 9 can be combined into a conditioning/heat pump device of known type comprising an inner unit to be positioned inside the internal environment and an outer unit 10; in particular, the internal heat exchanger 2 and the fan 9 in the inner unit of the conditioning device are as used conventionally, while the compression means 6 provided in the outer unit 10 are a compressor.
  • conduit 5 is connected to the compressor 6 of the outer unit 10 of the conditioning device.
  • an external heat exchanger 19 is connected to the internal heat exchanger 2 by a further throttling device 20.
  • Conditioning valve means 20a are provided between the external heat exchanger 19 and the further throttling device 20.
  • the external heat exchanger 19 is connected to the compression means 6 such that with the aid of a further external fan 21, it can operate as a conditioning device or as a conventional heat pump when the recovery valve means 3a are closed, whereas the conditioning valve means 20a are open.
  • the external heat exchanger 19, the further throttling device 20, the compression means 6 and the further external fan 21 are conventionally combined into an outer unit 10 of a conditioning device.
  • one or more conduits must be provided to connect the external heat exchanger 19 to the external environment.
  • the kitchen hood 1 of the invention further comprises an afterheater heat exchanger 22 connected to the internal heat exchanger 2 via a further throttling device 23.
  • this afterheater heat exchanger 22 is positioned downstream of the internal heat exchanger 2 with respect to the gas flow, such that the internal fan 9 can convey the gas mixture 13 drawn from the internal environment through both.
  • the afterheater heat exchanger 22 is connected to the compression means 6 by a further conduit 5'.
  • dehumidification valve means 23a for intercepting a vector flow preferably a two-way solenoid valve, are provided between the afterheater heat exchanger 22 and the internal heat exchanger 2 to interrupt the vector fluid flow through them.
  • the aim is to recover that heat quantity which would otherwise be dispersed by the hood when in operation.
  • the gas mixture 11 has a temperature T1 generally higher than or equal to ambient temperature, which for example is 18°C.
  • the gas mixture 11 is passed through one or more filtration devices conventionally provided in the hood 1, by which oily substances are removed.
  • the recovery heat exchanger 4 specifically operates as an evaporator.
  • the gas mixture 11 transfers to the vector fluid a heat quantity comprising two quantities: a first heat quantity, or sensible heat, which results in lowering of its temperature, and a second heat quantity, or latent heat, which results in condensation of the steam.
  • the evaporated vector fluid is fed to the compressor 6 through the conduit 5, while the steam condensate is collected in collection means provided below the recovery heat exchanger 4 in accordance with the known art.
  • the compressor 6 compresses the evaporated vector fluid to raise it to a higher temperature and higher pressure, by almost isentropic transformation, and conveys it to the internal heat exchanger 2 through the conduit 7.
  • the internal fan 9 draws the gas mixture 13 from the internal environment and forces it to flow through the internal heat exchanger 2
  • the gas mixture 13 is passed through one or more filtration devices, disposed upstream and/or downstream (with respect to the gas flow) of the heat exchanger 2 and/or of the fan 9.
  • the gas mixture 13 has a temperature T5 lower than the temperature T4 of the fluid in the heat exchanger 2.
  • the superheated saturated vapour of the vector fluid which flows through the internal heat exchanger 2 transfers a second heat quantity to the gas mixture 13 to raise it to a temperature T6 higher than T5. This second quantity is evidently proportional to the first heat quantity acquired by the vector fluid in the recovery heat exchanger 4.
  • the internal heat exchanger 2 operates as a condenser because in its interior the vector fluid changes state from vapour to liquid.
  • the air flow 14 at temperature T6 which leaves the internal fan 9 is then returned to the internal environment.
  • the saturated vapour of the vector fluid at temperature T4 which flows through the internal heat exchanger 2, transfers a first sensible heat quantity in cooling down, and a second latent heat quantity in condensing. It is hence retransformed into a liquid fluid, and is fed to the throttling device 4a where it expands to reduce its pressure and temperature.
  • the vector fluid is then fed to the recovery heat exchanger 4 to recommence the thermodynamic cycle.
  • thermodynamic cycle just described takes place in accordance with known modalities of refrigeration cycles.
  • control valve means 4c by activating the control valve means 4c only a portion of the heat exchanger 4 is involved in vector fluid circulation.
  • the heat quantity absorbed by the vector fluid can be regulated, with fine regulation of the heat recovery achieved by the hood 1 of the invention.
  • the hood 1 of the invention enables a series of devices to be installed in its interior enabling a thermodynamic cycle for saturated vapour compression (also known as a heat pump) to be achieved which enables a large part of the contained heat to be extracted from the gas mixture (moist air), and/or from the other gaseous substances or suspended aerosols produced by the cooking hob and evacuated towards the outside, using a vector fluid as the medium for transferring the heat to the internal environment.
  • a thermodynamic cycle for saturated vapour compression also known as a heat pump
  • the lowering of the temperature of the gas mixture 11 originating from the cooking hob and/or from the internal environment, determined by the evaporator 4 of the heat pump cycle, enables recovery both of the sensible heat (by temperature difference) and of the latent heat (by condensing the moisture and the other vapours dissolved in the gas mixture) of the gas mixture itself.
  • the recovered heat is again transferred (in the form of sensible heat) to the gas mixture of the internal environment by the internal heat exchanger 2 of the heat pump.
  • thermodynamic process results in a high efficiency in the recovery of heat from the flow 11, heat which would otherwise be dispersed to the external environment, and prevents any mixing between the gas mixture 11 originating from the cooking hob and the gas mixture from the internal environment, with consequent prevention of any contamination because of the absence of physical mixing either direct or indirect between the moist air flow and gaseous substances 11 and the gas flow 13 of the internal environment.
  • a second method of operation of the invention comprising closing the recovery valve means 3a and the conditioning valve means 20a, while the dehumidification valve means 23a are open.
  • the gas mixture 13 which has a determined temperature and a determined degree of humidity, is made to pass through the internal heat exchanger 2, to transfer a heat quantity to the vector fluid flowing through this internal heat exchanger 2.
  • the gas mixture 13a By transferring heat, the gas mixture 13a firstly cools and then on reaching the dew point causes the water vapour contained in it to condense. The condensate water is then drained by collection means pertaining to the known art. The vector fluid heats up and evaporates to become saturated vapour.
  • the vector fluid in the saturated vapour state is fed to the compression device 6 where it is compressed and superheated.
  • This superheated saturated vapour is then fed to the afterheater heat exchanger 22.
  • the cooled and dehumidified gas mixture 13a is forced through the afterheater heat exchanger 22 where it acquires a heat quantity from the vector fluid.
  • the temperature of the gas flow 14 returns to values close to that of the gas flow 13.
  • the vector fluid in the superheated saturated vapour state after being cooled and condensed, is fed to the throttling device 23 to undergo temperature and pressure reduction before being returned to the internal heat exchanger 2 to recommence the thermodynamic cycle.
  • the hood 1 of the invention can also reuse the heat extracted from the gas mixture 13 during the dehumidification stage, to then heat it before feeding it to the internal environment and then activate a process of dehumidification alone without ambient temperature variation.
  • This internal transfer of heat is effected by a fluid which performs the function of thermal vector within the heat pump cycle.
  • the hood of the invention can operate as a conventional conditioning device or heat pump, by using the internal heat exchanger 2 and the internal fan 9 for cooling and dehumidifying the air in summer or heating it in winter, while the further throttling device 20, the compression means 6, a further external fan 21 and the external heat exchanger 19 act as the external heat transfer unit of the conditioning device or heat pump.
  • the valve means are connected to a control unit which causes them to open or close on the basis of the operating method required by the user.
  • a control unit which causes them to open or close on the basis of the operating method required by the user.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Combinations Of Kitchen Furniture (AREA)
EP09004556.8A 2008-04-14 2009-03-30 Kitchen hood recovering a quantity of heat Active EP2110609B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09004556T PL2110609T3 (pl) 2008-04-14 2009-03-30 Kuchenny okap odzyskujący ilość ciepła

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000661A ITMI20080661A1 (it) 2008-04-14 2008-04-14 Cappa da cucina per il recupero di una quantita' di calore

Publications (3)

Publication Number Publication Date
EP2110609A2 EP2110609A2 (en) 2009-10-21
EP2110609A3 EP2110609A3 (en) 2016-09-14
EP2110609B1 true EP2110609B1 (en) 2019-07-17

Family

ID=40296920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09004556.8A Active EP2110609B1 (en) 2008-04-14 2009-03-30 Kitchen hood recovering a quantity of heat

Country Status (5)

Country Link
EP (1) EP2110609B1 (da)
DK (1) DK2110609T3 (da)
ES (1) ES2744214T3 (da)
IT (1) ITMI20080661A1 (da)
PL (1) PL2110609T3 (da)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITAN20120110A1 (it) * 2012-08-24 2014-02-25 Energy Resources S P A Unipersonal E Cappa da cucina innovativa avente funzione di climatizzazione invernale ed estiva ad alta efficienza energetica e metodo per la riduzione dei consumi energetici e per il miglioramento della qualità dell¿aria dell¿ambiente interno
CA2942435A1 (en) 2014-03-12 2015-09-17 Faber S.P.A. Kitchen extractor hood with thermal energy recovery
CN109210585A (zh) * 2018-11-22 2019-01-15 北斗星智能电器有限公司 集成灶散热装置及集成灶

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4171722A (en) * 1977-02-03 1979-10-23 Modine Manufacturing Company Heat recovery system
US4122834A (en) * 1977-04-04 1978-10-31 Jacobs Eugene A Ventilating, cooling and heat reclaiming apparatus for cooking equipment
IT1299396B1 (it) * 1998-03-25 2000-03-16 Micronasa Di Patarchi Alberto Cappa da cucina con recupero di energia termica prodotta dai piani di cottura
SI20289A (sl) * 1999-05-24 2000-12-31 Provent, D.O.O. Naprava za prezračevanje in vračanje toplotne energije
TR200803821T1 (tr) * 2005-12-15 2008-11-21 Arçeli̇k Anoni̇m Şi̇rketi̇ Bîr kombine pişirici cihaz
US8141624B2 (en) * 2006-06-28 2012-03-27 Martin Jeffrey R Apparatus for heating a restaurant kitchen, dining room, and hot water supply

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2110609A3 (en) 2016-09-14
ES2744214T3 (es) 2020-02-24
EP2110609A2 (en) 2009-10-21
ITMI20080661A1 (it) 2009-10-15
DK2110609T3 (da) 2019-09-09
PL2110609T3 (pl) 2019-11-29

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