WO2011070120A1 - Climatisation automobile - Google Patents

Climatisation automobile Download PDF

Info

Publication number
WO2011070120A1
WO2011070120A1 PCT/EP2010/069297 EP2010069297W WO2011070120A1 WO 2011070120 A1 WO2011070120 A1 WO 2011070120A1 EP 2010069297 W EP2010069297 W EP 2010069297W WO 2011070120 A1 WO2011070120 A1 WO 2011070120A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling section
conditioning system
air conditioning
duct
thermoelectric element
Prior art date
Application number
PCT/EP2010/069297
Other languages
English (en)
Inventor
César Do Patrocinio Rodrigues
Original Assignee
Suzuki International Europe Gmbh
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 Suzuki International Europe Gmbh filed Critical Suzuki International Europe Gmbh
Publication of WO2011070120A1 publication Critical patent/WO2011070120A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00478—Air-conditioning devices using the Peltier effect

Definitions

  • the present invention concerns a vehicle air conditioning system especially for cooling the interior of a vehicle by a cooled air flow into the interior whereas the air flow has been cooled by using a thermoelectric element.
  • the cooling liquid has to be inspected and changed at regular intervals and - the compressor has to create much more cooling output then being necessary for cooling the interior of the vehicle due to heating losses between the heat exchanger and the outlet nozzles.
  • a vehicle air conditioning system which comprises a main duct for guiding an unconditioned air flow into the vehicle interior.
  • the main duct has a cooling section in which at least one thermoelectric element is positioned such that the cold side of the thermoelectric element is in thermal contact with the air flow through the main duct while the hot side of the thermoelectric element is in thermal contact with an auxiliary duct for dissipation of thermal energy created by the thermoelectric element.
  • thermoelectric element is to be understood as designating any possible electrical element using the Peltier effect to transfer heat from one side of the element to the other side against a possible temperature gradient with consumption of electrical energy.
  • thermoelectric element may for example be manufactured by using two thin ceramic wafers with a series of P and N doped bismuth-telluride semiconductor material sandwiched between them.
  • the ceramic material on both sides of the thermoelectric adds rigidity and provides the necessary electrical insulation.
  • the N type material has an excess of electrons
  • the P type material has a deficit of electrons.
  • the electrons jump to a higher energy state absorbing thermal energy (cold side).
  • the electrons flow from the N type material to the P type material through an electrical connector, dropping to a lower energy state and releasing energy as heat to the heat sink (hot side).
  • thermoelectric couples are electrically connected in series and thermally in parallel.
  • a thermoelectric element may contain one to several hundred of such couples according to the cooling power needed.
  • the auxiliary duct may be filled with a cooling liquid.
  • the auxiliary duct is part of a cooling liquid circuit in which the cooling liquid is circulated by a circulating sys- tern in order to dissipate the heat created on the hot side of the thermoelectric element.
  • This special construction of the auxiliary duct provides a rather high efficiency of the air conditioning system with the possibility to use small components.
  • the auxiliary duct may divert from the main duct in a position upstream of the cooling section of the main duct so that a first part of the uncondi- tioned air flow is diverted into the auxiliary duct.
  • the first part of the unconditioned air flow through the auxiliary duct is in thermal contact with the hot side of the thermoelectric element and may therefore take up the heat created on the hot side of the thermoelectric element.
  • the thus heated air flow may be directed to the exterior of the vehicle.
  • the energy contained in the heated air flow may be used otherwise in the vehicle.
  • the cooling section of the main duct is at least partially surrounded by the auxiliary duct thus providing a maximum contact surface for energy dissipation.
  • the cooling section of the main duct and the auxiliary duct may at least in sections be arranged concentrically with the auxiliary duct surrounding the cooling section.
  • the term "concentrically” is not meant to necessarily imply circular cross sections of the respective ducts.
  • the ducts may rather have any possible suitable cross section, i.e. rectangular, oval or the like.
  • the main duct may also consist of several separate ducts of a rather small diameter each of these ducts having a cooling section containing one or more thermoelectric elements. In that case at least some of these separate small diameter ducts are positioned within the auxiliary duct for heat dissipation.
  • the cooling section of the main duct may include surface elements to enlarge the contact surface with the air flow through the cooling section, the surface elements being at least partly in thermal contact with the cold side of the thermoelectric element.
  • Such elements may for example have a honeycomb structure to maximise strength as well as contact surface.
  • such surface elements consist of a material with a high thermal conductivity, e.g. thin metal sheets made of copper or aluminium.
  • the cross section of the cooling section of the main duct itself may be such that the contact surface with the air flow is maximised.
  • a star like cross section may be used in the cooling section of the main duct.
  • the cooling of the air flow in the cooling section of the main duct may lead to condensation of the water contained in the unconditioned air on the cold surface of the thermoelectric element. Therefore the cooling section of the main duct may include a condense water drain for evacuating such condense water. Advanta- geously the condense water drain is positioned at the lowest point of the cooling section so that water condensing out of the air flow passing the cooling section substantially flows into the condense water drain due to gravitation only.
  • the cooling section of the main duct may further include at least one overflow ele- ment preventing condense water to flow into the vehicle interior and/or in the main duct upstream of the cooling section.
  • overflow elements may for example consist of steps in the surface of the cooling section, lugs at the entrance and/or exit of the cooling section or the like.
  • the air conditioning system according to the present invention may further include a drainage conduit connecting the condense water drain of the cooling section with the exterior of the vehicle or a water container, e.g. the container for supplying water for cleaning the windshield.
  • the drainage conduit preferably is in thermal contact with the air flow through the aux- iliary duct downstream of the position of the hot side of the thermoelectric element.
  • the thermoelectric element may be equipped with a temperature control device so that the electric voltage/power applied to the thermoelectric element is controlled according to the needed cooling performance or any other environmental conditions.
  • the temperature control device may therefore include a temperature sensor being located at any suitable position inside the interior of the vehicle being and may be coupled to an input device on the drivers/operators console. Thus the driver/operator inside the vehicle may set a nominal temperature via the input device and the temperature control device will use the set nominal temperature value as well as the actual temperature inside the vehicle for controlling the electric voltage/power applied to the thermoelectric element.
  • the temperature control device may include a further sensor element sensing the temperature of the cold side of the thermoelectric element to prevent a cooling of the surface of the cold side of the thermoelectric element below 2 - 3 ° C.
  • the cooling section of the main duct comprises two subsections which are inclined with respect to each other and possible with respect to the horizontal.
  • the condense water drain is positioned at the lowest transition point between the subsections so that condense water may flow into the drain from both of the subsections.
  • the subsections are separated by a groove in which the condense water drain is formed. In this case the edges of the groove may additionally act as an overflow element as described above.
  • FIG. 1 a cross sectional view of the embodiment of Fig. 1 seen along line A- A;
  • FIG. 1 shows a first embodiment of a vehicle air conditioning system 1 according to the present invention.
  • the system 1 comprises a main duct 2 for guiding an unconditioned air flow 20 into the vehicle interior (not shown).
  • a thermoelectric element 4 is positioned within a cooling section 3 of the main duct 2 .
  • the circuitry and controlling of thermoelectric elements are well known to a person skilled in the arts.
  • an auxiliary duct 5 diverts from the main duct 2 so that a first part 21 of the unconditioned air flow 20 is diverted into the auxiliary duct 5 whereas a second part 22 of the unconditioned air flow 20 continues flow- ing through the main duct 2 and into the cooling section 3.
  • the then conditioned air flow 23 in guided into the interior of the vehicle.
  • thermoelectric element 4 For cooling the second part 22 of the unconditioned air flow 20 flowing through the cooling section 3 the cold side 4a of the thermoelectric element 4 is in thermal contact with the air flow 22.
  • the first part 21 of the unconditioned air flow 20 which had been diverted into the auxiliary duct 5 is guided over the hot side 4b of the thermoelectric element 4 and thus takes up thermal energy.
  • the thus heated air flow 24 is guided to an exhaust duct 6 which may be directed to the exterior of the vehicle or lead to another part of the vehicle in which the heated air flow 24 may be used in any suitable way.
  • thermoelectric element 4 mainly has an annular form in the shown embodiment and separates the cooling section 3 of the main duct 2 and the auxiliary duct 5 whereas these two elements are arranged concen- trically with the cooling section 3 being positioned within the auxiliary duct 5.
  • the auxiliary duct 5 itself consists of two concentrically arranged parts 5a, 5b. After having passed the inner part 5a of the auxiliary duct 5, in which the air flow 21 is guided over the hot side 4b of the thermoelectric element 4, the flowing di- rection of the air flow 21 is reversed by an end wall 5c and guided into the outer part 5b of the auxiliary duct.
  • Both parts 5a, 5b of the auxiliary duct 5 essentially have the form of a hollow cylinder in the present case.
  • the outer part 5b of the auxiliary duct 5 is connected to the exhaust duct 6, which in the present case is directed downwards.
  • the main duct 2 as well as the inner part 5a of the auxiliary duct 5 are conically tapered towards the upstream end.
  • Figure 3 shows another embodiment of a vehicle air conditioning system accord- ing to the present invention.
  • system 1 comprises a main duct 2 for guiding the unconditioned air flow 20 into the vehicle interior (not shown) with a thermoelectric element 4 being positioned within a cooling section 3 of the main duct 2.
  • a thermoelectric element 4 being positioned within a cooling section 3 of the main duct 2.
  • an auxiliary duct 5 diverts from the main duct 2 upstream of the cooling section 3 so that a first part 21 of the unconditioned air flow 20 is diverted into the auxiliary duct 5 whereas a second part 22 of the unconditioned air flow 20 continues flowing through the main duct 2 into the cooling section 3 and is finally guided into the interior of the vehicle.
  • the cooling section 3 comprises two subsections 3a and 3b and in each subsection a thermoelectric element 4', 4" is positioned such that the respective cold sides 4'a, 4"a of the thermoelectric elements 4', 4" are in thermal contact with the air flow 22 through the main duct 2.
  • both parts 4', 4" of the thermoelectric element 4 each have substantially the form of a hollow cylinder.
  • the two parts 4' and 4" of the thermoelectric element 4 and thus the two subsections 3a and 3b of the cooling section 3 are arranged one after the other in longitudinal direction of the main duct 2 with both parts 4', 4" being inclined by several degrees with respect to the horizontal direction H.
  • the first part 4' of the thermoelectric element 4 slopes when seen in the flowing direction of the air flow 22
  • the second part 4" of the thermoelectric element 4 rises when seen in the flowing direction of the air flow 22.
  • An annular groove 7 is formed at the transition between the two subsections 3a, b of the main duct 3 in order to collect water condensing out of the air flow 22 passing the cooling section 3. Due to the inclinations of the two parts 4' and 4" of the thermoelectric element 4 with respect to the horizontal direction H water condens- ing on the parts 4' and 4" of the thermoelectric element 4 will flow into the annular groove 7 between the parts 4' and 4" due to gravity.
  • a condense water drain 8 is positioned at the lowest part of the annular groove 7 so that condense water accumulating in the annular groove 7 will substantially flow into the condense water drain 8 due to gravity as well.
  • a drainage conduit 9 connects the condense water drain 8 with the exterior of the vehicle in order to evacuate the condense water.
  • the drainage conduit 9 crosses the auxiliary duct 5 twice and thus is in thermal con- tact with the air flow 24 through the auxiliary duct 5 being heated by the hot sides 4'b and 4"b of the two parts 4' and 4" of the thermoelectric element 4. Therefore a freezing of the condense water within the drainage conduit 9 due to cold ambient temperatures outside the vehicle may be avoided.
  • the second part 4" of the thermoelectric element 4 has a slightly larger diameter then the first part 4' of the thermoelectric element 4.
  • the inner edge 41 of the downstream front wall 42 of the first part 4' of the thermoelectric element 4 defines an overflow element preventing condense water to flow back into the main duct 2 upstream of the cooling section 3.
  • lug 43 is positioned at the lower part of the downstream end of the second part 4" of the thermoelectric element 4 preventing condense water from flowing into the vehicle interior.
  • lug 43 may also be present in the upper part of the downstream end of the second part 4" of the thermoelectric element 4, e.g. in form of an annular lug.
  • a third overflow element at the upstream end of the first part 4' of the thermoelectric element 4 in order to prevent a flow of condense water into the auxiliary duct 5.
  • a flow of condense water from the cooling section 3 into the vehicle interior or back into the auxiliary duct 5 and thus against the rising inclinations of the first or second part 4', 4" of the thermoelectric element 4 may for example be induced by sudden movements of the vehicle, i.e. hard braking or fast acceleration.
  • thermoelectric element 4 Similar as in the embodiment of figure 1 the first part 21 of the unconditioned air flow 20 which had been diverted into the auxiliary duct 5 is guided over the hot sides 4'b and 4"b of the thermoelectric element 4 thus taking up thermal energy created on the hot sides 4'b and 4"b of the thermoelectric element 4. The thus heated air flow 24 is guided to the exhaust duct 6.
  • thermoelectric element 4 dissipation of the thermal energy created on the hot sides 4b, 4'b, 4"b of the thermoelectric element 4 is achieved by directing a first part 21 of the unconditioned air flow 20 through an auxiliary duct 5 diverting from the main duct 2 in a position upstream of the cooling section 3.
  • Figure 4 shows an alternative way of energy dissipation in which all of the unconditioned air stream 20 is directed into the main duct 2 and through the cooling section 3 consisting of two subsections 3a and 3b with respective first and second parts 4' and 4" of the thermoelectric element 4.
  • the cooling section 3 of the air conditioning system 1 is concentrically surrounded by an auxiliary duct 50 which in the embodiment shown is filled with a cooling liquid 51 entering through an inlet 52, and being discharged through an outlet 53.
  • the auxiliary duct 50 is part of a (not shown) cooling liquid circuit in which the cooling liquid 51 is circulated by a (not shown) circulating system.
  • the inlet 52 and outlet 53 are shown to be both positioned at the upstream end of the cooling section 3 is it obvious that it is possible to position the inlet 52 and the outlet 53 at different positions, e.g. at different ends of the cooling section 3 in order to enhance the flow of the cooling liquid 51 through the auxiliary duct 50.
  • the cooling liquid inlet (52) and outlet (53) of figure 4 may be arranged such that the thermo-syphon effect is maximised by supporting the natural flow trend of fluids, i.e. warm fluid flowing vertically upwards. Thus the pumping power of the cooling liquid circuit may by reduced.
  • the subsections 3a and 3b of the cooling section 3 and thus the first and second parts 4' and 4" of the thermoelectric element 4 are each inclined by several degrees with respect to the horizontal direction H.
  • the embodiment of figure 4 also includes an annular groove 7, a condense water drain 8 and a drainage conduit 9 as well as overflow elements 41 and 43 as described before in connection with the embodiment shown in figure 3.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)

Abstract

La présente invention a trait à une climatisation automobile comprenant une conduite principale permettant de guider un écoulement d'air non conditionné à l'intérieur du véhicule et au moins un élément thermoélectrique placé dans une partie de refroidissement de la conduite principale de manière à ce qu'un côté froid de l'élément thermoélectrique soit en contact thermique avec l'écoulement d'air d'un bout à l'autre de la conduite principale. En ce qui concerne la dissipation de l'énergie thermique créée du côté chaud de l'élément thermoélectrique, le côté chaud de l'élément thermoélectrique est en contact thermique avec une conduite auxiliaire tandis qu'un liquide de refroidissement ou une partie de l'écoulement d'air non conditionné est dirigé à travers la conduite auxiliaire.
PCT/EP2010/069297 2009-12-09 2010-12-09 Climatisation automobile WO2011070120A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20090178523 EP2332758B8 (fr) 2009-12-09 2009-12-09 Dispositif de climatisation de véhicules
EP09178523.8 2009-12-09

Publications (1)

Publication Number Publication Date
WO2011070120A1 true WO2011070120A1 (fr) 2011-06-16

Family

ID=41720648

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/069297 WO2011070120A1 (fr) 2009-12-09 2010-12-09 Climatisation automobile

Country Status (2)

Country Link
EP (1) EP2332758B8 (fr)
WO (1) WO2011070120A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013114312A1 (de) 2013-12-18 2015-06-18 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Vorrichtung zur Wärmerückgewinnung mit einem ersten Rohrelement für ein Kraftfahrzeug

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013009515A1 (de) * 2013-06-06 2014-12-11 Volkswagen Aktiengesellschaft Klimaanlage für ein Fahrzeug

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901572A (en) * 1995-12-07 1999-05-11 Rocky Research Auxiliary heating and air conditioning system for a motor vehicle
US20060048519A1 (en) * 2004-09-07 2006-03-09 Childress William H Portable thermoelectric cooling and heating device
DE102006042160A1 (de) * 2006-09-06 2008-03-27 Visteon Global Technologies Inc., Van Buren Thermoelektrisches Heizungs- und Kühlungssystem für ein Hybridfahrzeug
US20080168787A1 (en) * 2007-01-11 2008-07-17 Denso Corporation Local air conditioning system for vehicle and method of controlling local air conditioning unit
WO2009122282A1 (fr) * 2008-04-01 2009-10-08 Creactive Design Limited Perfectionnements apportés au refroidissement de compartiments de véhicules ferroviaires ou concernant celui-ci

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901572A (en) * 1995-12-07 1999-05-11 Rocky Research Auxiliary heating and air conditioning system for a motor vehicle
US20060048519A1 (en) * 2004-09-07 2006-03-09 Childress William H Portable thermoelectric cooling and heating device
DE102006042160A1 (de) * 2006-09-06 2008-03-27 Visteon Global Technologies Inc., Van Buren Thermoelektrisches Heizungs- und Kühlungssystem für ein Hybridfahrzeug
US20080168787A1 (en) * 2007-01-11 2008-07-17 Denso Corporation Local air conditioning system for vehicle and method of controlling local air conditioning unit
WO2009122282A1 (fr) * 2008-04-01 2009-10-08 Creactive Design Limited Perfectionnements apportés au refroidissement de compartiments de véhicules ferroviaires ou concernant celui-ci

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013114312A1 (de) 2013-12-18 2015-06-18 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Vorrichtung zur Wärmerückgewinnung mit einem ersten Rohrelement für ein Kraftfahrzeug

Also Published As

Publication number Publication date
EP2332758A1 (fr) 2011-06-15
EP2332758B1 (fr) 2012-05-23
EP2332758B8 (fr) 2012-08-08

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