EP3450860B1 - Ausseneinheit für eine quellenwärmepumpe - Google Patents

Ausseneinheit für eine quellenwärmepumpe Download PDF

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Publication number
EP3450860B1
EP3450860B1 EP17188992.6A EP17188992A EP3450860B1 EP 3450860 B1 EP3450860 B1 EP 3450860B1 EP 17188992 A EP17188992 A EP 17188992A EP 3450860 B1 EP3450860 B1 EP 3450860B1
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EP
European Patent Office
Prior art keywords
heat exchanger
outdoor unit
cutout
drainage
supports
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
EP17188992.6A
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English (en)
French (fr)
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EP3450860A1 (de
Inventor
Jan Tichota
Ondrej Vítek
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.)
Daikin Europe NV
Daikin Industries Ltd
Original Assignee
Daikin Europe NV
Daikin Industries Ltd
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 Daikin Europe NV, Daikin Industries Ltd filed Critical Daikin Europe NV
Priority to EP17188992.6A priority Critical patent/EP3450860B1/de
Publication of EP3450860A1 publication Critical patent/EP3450860A1/de
Application granted granted Critical
Publication of EP3450860B1 publication Critical patent/EP3450860B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/36—Drip trays for outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate

Definitions

  • the present disclosure relates to air source heat pumps and particularly to an outdoor unit of an air source heat pump. Even more particularly, the present disclosure relates to air source heat pumps for heating and/or cooling a space, such as for air conditioners, heatings or other HVAC applications or for water heating (domestic hot water).
  • Outdoor units of this kind include a heat exchanger accommodated in a casing of the outdoor unit.
  • the heat exchanger in the outdoor unit is configured to enable heat exchange between a refrigerant circulating in the refrigerant circuit of the heat pump and outside air as the heat source.
  • the heat exchanger is connected to the refrigerant circuit of the heat pump and flown through by the refrigerant flowing in the refrigerant circuit.
  • outside air is forced through the heat exchanger, e.g. by means of a fan. Due to humidity of the outside air and/or the temperature difference between the outside air and the refrigerant, water may condense on the surfaces of the heat exchanger and freezes at low outdoor temperatures.
  • the ice melts and water flows along the surfaces of the heat exchanger and accumulates in the casing of the outdoor unit and particularly on a bottom of the casing in an area below the heat exchanger.
  • JP 2013-217525 discloses such an outdoor unit suggesting a drainage hole in the bottom of the casing in order to drain any condensation water accumulating on a bottom of the casing out of the casing of the outdoor unit.
  • the drainage hole is positioned between opposite ends of the heat exchanger in a longitudinal direction of the heat exchanger and condensation water has to be guided to the drainage hole by suitable configurations of the inner side of the bottom (e.g. inclinations, channels, etc.).
  • suitable configurations of the inner side of the bottom e.g. inclinations, channels, etc.
  • the preamble of claim 1 is based on WO 2012/124457 A1 disclosing an outdoor unit for an air conditioner.
  • EP 2 995 874 A2 refers to an outdoor unit for an air conditioner is provided, including a cabinet with at least one suction panel, a base provided at a lower portion of the cabinet, wherein a compressor and a heat exchanger are provided on the base.
  • the first cutout 12 extends along a major portion of the lower end 51 of the heat exchanger 50 (indicated by the broken line) between first and second distanced portions 52, 53 (first and second supported areas) of the heat exchanger 50 at which the heat exchanger 50 is supported on the bottom 11 of the casing 10.
  • first and second distanced portions 52, 53 first and second supported areas of the heat exchanger 50 at which the heat exchanger 50 is supported on the bottom 11 of the casing 10.
  • the first cutout 12 and the bottom 11 of the casing 10 can extend along the entire length of the heat exchanger 50 in its longitudinal direction except for the discrete portions 52, 53 of the heat exchanger 50 at which the heat exchanger 50 is supported on the bottom 11 of the casing 10.
  • These discrete portions 52, 53 generally correspond to areas 18, 19 (supporting areas) of the bottom 11 at which the bottom 11 and, hence, the casing 10 are supported on a horizontal surface or via mounting brackets 100 on a vertical wall.
  • the casing 10 has supports 13 in the form of feet extending between opposite edges 14, 15 (in the particular example longitudinal edges) of the bottom 11 and being fixed to the bottom 11.
  • a damping element 30, such as a rubber or metal spring
  • the first cutout 12 In order to most efficiently and quickly drain condensation water from the heat exchanger 50 to the outside of the casing 10, the first cutout 12 should be as large as possible. Yet, this leads to the problem that opposite edges 16, 17 of the first cutout 12 along the longitudinal direction of the heat exchanger 50 (or of the first cutout 12) are located adjacent the supports 13 and, hence, the damping elements 30.
  • the disadvantage is that the size of the first cutout 12 will be reduced, thereby reducing the efficiency with which the water is led out of the casing 10. Moreover, even increasing the distance may not entirely eliminate the risk, because water may, because of the surface tension, be accumulated on a lower side (bottom side) of the bottom and may still reach the supports 13 and the damping elements 30.
  • the present disclosure suggests an outdoor unit for an air source heat pump, particularly for heating and/or cooling a space or water heating as described in more detail above.
  • the outdoor unit comprises a heat exchanger.
  • the heat exchanger is to be connected to a refrigerant circuit of the heat pump and configured to exchange heat between outside air and the refrigerant flowing through the refrigerant circuit.
  • the heat exchanger may be of any known kind.
  • the heat exchanger is flat.
  • the length and height may be larger than the width.
  • the heat exchanger is longitudinal in that the length is larger than the height.
  • the heat exchanger may have at least a first straight portion along its longitudinal direction and an optional curved or bent portion at one end of the straight portion in its longitudinal direction.
  • the outdoor unit comprises a bottom as part of a casing of the outdoor unit.
  • the casing accommodates the heat exchanger.
  • the bottom has an upper inner side and a lower outer side.
  • the upper inner side is directed toward the inside of the casing, whereas the lower outer side is directed toward the outside of the casing.
  • the bottom is configured to support a lower end of the heat exchanger in its height direction.
  • the bottom may be a longitudinal having a length larger than its width. Further, the bottom may be pan-shaped having upright edges around its periphery (except for drainage edges as described below).
  • first and second supports are provided at the lower outer side of the bottom.
  • the supports may in this context also be defined as a foot.
  • the supports may extend between and in some example beyond opposite longitudinal edges (edges along the length) of the bottom.
  • the supports are distanced in a longitudinal direction of the bottom (in some examples corresponding to the longitudinal direction of the heat exchanger).
  • the bottom has at least one drainage edge extending along a portion of the support and being configured to drain liquid (particularly condensation water) accumulating on the upper inner side of the bottom to the outside of the casing.
  • the drainage edge may extend in a widthwise direction of the bottom, i.e. when the supports extend between longitudinal edges, it extends in a widthwise direction of the bottom.
  • the drainage edge is parallel to the widthwise direction of the bottom. Yet, it is also conceivable that the drainage edge is angled relative to the widthwise direction.
  • the drainage edge slopes from the upper inner side of the bottom in a direction to the lower outer side of the bottom away from the support.
  • a sloping drainage edge prevents the water from adhering to the lower outer side of the bottom due to surface tension and on the other hand provides for the advantage that a distance of the free end (extremity) of the drainage edge may be located closer to the support as compared to a case in which the bottom is horizontal at the drainage edge (see Figure 2A ) or in which the drainage edge slopes from the upper inner side of the bottom in a direction to the lower outer side of the bottom toward the support (see Figure 2B ).
  • the slope of the drainage edge ranges from substantially vertically (1°) to an angle of 55° relative to a line perpendicular to the bottom (vertical line in cross-section).
  • the slope of the drainage edge ranges from 10° to 45° relative to a line perpendicular to the bottom (vertical line in cross-section).
  • a smallest distance between a free end (extremity) of the drainage edge and the support is at least 15 mm.
  • the smallest distance resides between 15 mm and 50 mm.
  • the distance may be constant, which is particularly the case, if the drainage edge extends parallel to the support (e.g. parallel to the widthwise direction of the bottom).
  • the bottom supports the lower end (in the height direction) of the heat exchanger at a discrete portion (first supported portion) of the heat exchanger, wherein an area of the bottom corresponding to the discrete portion is pan-shaped and comprises the drainage edge.
  • the bottom may have a bead (recess or dimple) at least in the area of the bottom corresponding to the discrete portion.
  • the outdoor unit may further comprise a damping element at the support, in particular at a side of the support opposite to the bottom.
  • the damping element may be of any kind, such as a rubber or metal spring.
  • first and second supports two of the supports are provided (first and second supports).
  • the two supports may be distanced from each other in a longitudinal direction of the bottom (and according to an example also along the longitudinal direction of the heat exchanger).
  • the bottom comprises a firtst cutout extending between the supports.
  • the first cutout may be a closed opening in the bottom or an opening in the bottom which is open at one side.
  • the bottom supports the lower end of the heat exchanger in the height direction of the heat exchanger at distanced discrete portions (first and second supported portions) of the heat exchanger in areas corresponding to the supports.
  • a longitudinal portion of the heat exchanger spans the first cutout and any water flowing down from the surfaces of the heat exchanger in this portion (portion of the heat exchanger spanning the first cutout) will drop to the ground without being accumulated on the bottom or in the casing.
  • two of the drainage edges are disposed at facing (opposite) edges of the first cutout. Hence, it may be ensured that a major portion of the condensation water is discharged through the first cutout even from the portions at the opposite ends of the first cutout where the heat exchanger is supported on the bottom.
  • drainage edges are provided on opposite sides of one of the supports, wherein the drainage edges slope in opposite directions away from each other.
  • the bottom 11 of the casing 10 (indicated by the broken line in Figure 4 ) in Figure 2 has opposite longitudinal edges 14 and 15 as well as opposite transverse edges 23 and 24.
  • the bottom 11 further has an upper inner side 20 and a lower outer side 21 (see Figure 2 ).
  • the upper inner side 20 is directed toward the inside of the casing 10 whereas the lower outer side 21 is directed to the outside of the casing 10.
  • the upper inner side surface 20 of the bottom 11 is the top surface of the bottom 11 facing upward and the lower outer side 21 faces downward.
  • a heat exchanger 50 (indicated by the broken line in Figures 3 and 4 ) is supported at discrete portions 52, 53 (supported portion 52, 53) at a lower end 51 of the heat exchanger 50 in the height direction HD.
  • the height direction HD is perpendicular to the plan view in Figure 3 and, hence, perpendicular to the bottom 11 as indicated in Figure 4 .
  • the areas of the bottom 11 supporting the heat exchanger 50 and corresponding to the supported areas are denoted by the reference numerals 18 and 19 (supporting areas 18, 19).
  • the heat exchanger 50 may be configured similar to the heat exchanger has disclosed in JP 2013-217525 A .
  • the heat exchanger 50 may in plan view have a straight portion 54 and a curved portion 55.
  • the straight portion 54 of the heat exchanger 50 extends between the supported portions 52, 53, wherein the curved portion 55 starts at the supported portion 53.
  • the heat exchanger 50 may be of a flat type, wherein the height H (see Figure 4 ) and the length L (see Figure 3 ) are larger than the width W (see Figure 3 ).
  • the bottom 11 has a first cutout 12 extended between the supporting portions 18, 19 in a longitudinal direction LD of the bottom 11.
  • the first cutout 12 is open at one side as visible in the plan view of Figure 3 .
  • the first cutout 12 is open at the side facing away from the longitudinal side edge 15 of the bottom 11.
  • the depth of the first cutout 12 in a widthwise direction WD may be equal to or larger than the width W of the heat exchanger 50.
  • the first cutout 12 should be configured so that a portion of the lower end 51 of the heat exchanger 50 between the supported portions 52 and 53 spans the first cutout 12 and is fully accommodated within the first cutout 12.
  • the first cutout 12 is thus delimited by the longitudinal side edge 15 of the bottom 11 and two opposite edges 16, 17 facing towards each other. As a result, any water flowing down from the heat exchanger 50 may drop immediately to the ground from the lower end 51 of the heat exchanger 50 through the first cutout 12 in the bottom.
  • Another second cutout 25 may be provided to cover a lower end 51 of the curved portion 55 of the heat exchanger 50.
  • the second cutout 25 extends between the supported portion 53 or the supporting portion 19 and the end of the heat exchanger 50 opposite to the end at which the supported portion 52 of the heat exchanger 50 is located.
  • a portion of the lower end 51 of the heat exchanger 50 in the area of the curved portion 55 is fully accommodated within the second cutout 25.
  • the second cutout 25 in Figure 3 is as well open at an end facing away from the transverse side edge 24 of the bottom 11.
  • the second cutout 25 is delimited by the transverse edge 24, the bottom 11 as well as opposite edges 26 and 27 of the second cutout 25.
  • any water flowing down from the heat exchanger 50 may drop immediately to the ground from the lower end 51 of the heat exchanger 50 through the second cutout 25 in the bottom.
  • each first cutout 12, 25 may have an open end as the cutouts 12 and 25 in Figure 3 or that each first cutout 12, 25 may be configured as a closed opening as shown with respect to the second cutout 25 in Figure 1 .
  • feet (supports) 13 are attached to the lower outer side 21 of the bottom 11.
  • the supports 13 are in plan view longitudinal and extend between and beyond the opposite longitudinal edges 14, 15 of the bottom 11 in the widthwise direction WD.
  • the opposite edges 16, 17 of the first cutout 12 extend in parallel to the side edges of the supports 13, i.e. parallel to the widthwise direction WD of the bottom 11. The same applies for the edge 22 of the second cutout 25.
  • damping elements 30 are sandwiched between the supports 13 and the mounting brackets 100.
  • elastic elements for example cylinders
  • the damping element 30 may be made of a rubber.
  • metal springs may be used.
  • the damping elements 30 serve to dampen any vibrations occurring during the operation of the heat pump in the outdoor unit and preventing the vibrations from being transferred to the horizontal surface or to a vertical surface to which the outdoor unit is attached to.
  • the areas 28 of the bottom 11, at which the supporting surface 18, 19 are provided are provided with a bead (recess or dimple) so as to be pan-shaped.
  • the pan-shaped areas 28 are delimited at a portion of their circumference by drainage edges 22.
  • the drainage edges 22 are located at the edges 16, 17 and 26 of the cutouts 12 and 25.
  • a further drainage edge 31 is located at the edge 27 of the second cutout 25 which may be configured similar to the drainage edges 22 described in the following.
  • the drainage edge 31 is not located in close proximity to the supports 13 and, hence, the damping elements 30 as the drainage edges 22, the drainage edge 31 is not that problematic with respect to the formation of ice on the damping elements 30 and will not be described in more detail in this application.
  • the drainage edge 22 is configured so as to slope from the inner side surface of the bottom 11 in a direction to the outer side surface of the bottom away from the support 13 and, hence, the damping element 30, as schematically shown in Figure 2C and in more detail in Figure 6 .
  • This solution provides for the best compromise of a small distance X between the free end 29 of the drainage edge 22 in a cross-sectional side view and a relatively large first cutout 12 and the longitudinal direction LD of the bottom 11.
  • water accumulating in the areas 28 can efficiently and quickly be let out of the casing 10 maintaining a relatively large first cutout 12 so that the amount of water accumulating in the areas 28 can be reduced to a minimum.
  • the distance D between the free end 29 of the drainage edge 22 and the support 13 should be at least 15 mm and according to an embodiment resides between 15 mm and 50 mm.
  • the angle ⁇ of the slope of the drainage edge 22 should reside between 1° (close to the vertical or substantially vertical) and 55°, preferably between 10° and 45° relative to a line 32 perpendicular to the bottom 11 or a vertical line 32.
  • drainage edges 22 are positioned at the edges 16, 17 of the first cutout 12.
  • the drainage edges 22 extend parallel to the widthwise direction WD and the supports 13 and delimit the first cutout 12.
  • the drainage edges 22 at the edges 16, 17 are disposed opposite to and facing each other in association with the respective supports 13.
  • the drainage edges 22 at the edges 16, 17 slope towards each other.
  • the drainage edges 22 at the edges 17 and 26 are associated to the same support 13, but different cutouts 12, 25.
  • the drainage edges 22 at the edges 17 and 26 are provided on opposite sides of the support 13 facing away from each other as clearly apparent from Figures 4 and 5 as well as in the plan view of Figure 3 .
  • the drainage edges 22 at the edges 17 and 26 slope in opposite directions away from each other.
  • the cutouts may be configured to have open and/or to be closed openings.
  • the positioning of the drainage edges 22 may be adapted to the shape of the heat exchanger and/or the configuration of the bottom plate and the cutouts. Thus, there may even be further drainage edges 22 or less drainage edges 22 than described in the above embodiment.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)

Claims (9)

  1. Außeneinheit für eine Luftquellen-Wärmepumpe, umfassend:
    einen Wärmetauscher (50);
    einen Boden (11), der eine obere Innenseite (20) und eine untere Außenseite (21) aufweist, wobei der Boden (11) ein unteres Ende (51) des Wärmetauschers (50) stützt; und
    erste und zweite Stützen (13) an der unteren Außenseite (21) des Bodens (11) zum Stützen des Bodens (11),
    wobei der Boden (11) mindestens einen Drainagerand (22) aufweist, der sich entlang eines Abschnitts der Stützen (13) erstreckt und ausgestaltet ist, Flüssigkeit, die sich auf der oberen Innenseite (20) des Bodens (11) ansammelt, nach außen abzuleiten,
    wobei sich der Drainagerand (22) von der Innenseite des Bodens (11) in eine Richtung zu der Außenseite des Bodens (11) weg von den Stützen (13) neigt, dadurch gekennzeichnet, dass der Boden (11) einen ersten Ausschnitt (12) umfasst, der sich zwischen den ersten und zweiten Stützen (13) erstreckt, wobei der Boden (11) das untere Ende des Wärmetauschers (51) an beabstandeten, diskreten ersten und zweiten gestützten Abschnitten (52, 53) des Wärmetauschers (50) in Bereichen stützt, die den ersten und zweiten Stützen (13) entsprechen, sodass ein Abschnitt des Wärmetauschers (50) den Ausschnitt (12) überspannt, und wobei sich der erste Ausschnitt (12) entlang eines Hauptabschnitts des unteren Endes (51) des Wärmetauschers (50) zwischen den ersten und zweiten gestützten Abschnitten (52, 53) des Wärmetauschers (50) erstreckt.
  2. Außeneinheit nach Anspruch 1, wobei die Neigung des Drainagerands (22) von 1° bis 55°, vorzugsweise von 10° bis 45° in Bezug auf eine Linie senkrecht zu dem Boden (11) gewinkelt ist.
  3. Außeneinheit nach Anspruch 1 oder 2, wobei ein kleinster Abstand zwischen einem freien Ende (29) des Drainagerands (22) und der Stütze (13) mindestens bei 15 mm liegt und vorzugweise zwischen 15 mm und 50 mm beträgt.
  4. Außeneinheit nach einem der vorstehenden Ansprüche, wobei ein Bereich des Bodens (11), der dem ersten gestützten Abschnitt (52) entspricht, pfannenförmig ist und den Drainagerand (22) umfasst.
  5. Außeneinheit nach einem der vorstehenden Ansprüche, wobei sich die erste Stütze (13) zwischen zwei gegenüberliegenden Rändern des Bodens (11) erstreckt.
  6. Außeneinheit nach einem der vorstehenden Ansprüche, weiter umfassend ein Dämpfungselement (30) an der ersten Stütze (13).
  7. Außeneinheit nach einem der vorstehenden Ansprüche, wobei zwei der Drainageränder (22) bereitgestellt und jeweils an einander zugewandten Rändern des Ausschnitts (12) angeordnet sind.
  8. Außeneinheit nach einem der vorstehenden Ansprüche, wobei zwei der Drainageränder (22) bereitgestellt und jeweils an gegenüberliegenden Seiten der ersten Stütze (13) angeordnet sind, wobei sich die Drainageränder (22) in entgegengesetzte Richtungen voneinander weg neigen.
  9. Außeneinheit nach einem der vorstehenden Ansprüche, wobei der Wärmetauscher (50) einen geraden Abschnitt (54) und einen gekrümmten Abschnitt (55) aufweist, wobei sich der gerade Abschnitt (54) zwischen den ersten und zweiten gestützten Abschnitten (52, 53) erstreckt und der gekrümmte Abschnitt (55) an dem zweiten gestützten Abschnitt (53) beginnt, und wobei die Außeneinheit weiter einen zweiten Ausschnitt (25) umfasst, der bereitgestellt ist, um ein unteres Ende (51) des gekrümmten Abschnitts (55) des Wärmetauschers (50) zu bedecken, wobei sich der zweite Ausschnitt (25) zwischen dem zweiten gestützten Abschnitt (53) und dem Ende des Wärmetauschers (50) erstreckt, das dem Ende gegenüberliegt, an dem sich der erste gestützte Abschnitt (52) befindet.
EP17188992.6A 2017-09-01 2017-09-01 Ausseneinheit für eine quellenwärmepumpe Active EP3450860B1 (de)

Priority Applications (1)

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EP17188992.6A EP3450860B1 (de) 2017-09-01 2017-09-01 Ausseneinheit für eine quellenwärmepumpe

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Application Number Priority Date Filing Date Title
EP17188992.6A EP3450860B1 (de) 2017-09-01 2017-09-01 Ausseneinheit für eine quellenwärmepumpe

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EP3450860A1 EP3450860A1 (de) 2019-03-06
EP3450860B1 true EP3450860B1 (de) 2020-07-22

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4892713B2 (ja) * 2008-08-25 2012-03-07 シャープ株式会社 空気調和機
JP2012193925A (ja) * 2011-03-17 2012-10-11 Sharp Corp 空気調和機の室外機
JP5797149B2 (ja) 2012-04-05 2015-10-21 三菱電機株式会社 空気調和装置の室外機及びそれを備えた空気調和装置
EP3076095B1 (de) * 2013-11-26 2019-05-08 Daikin Industries, Ltd. Innenraumeinheit
KR20160031230A (ko) * 2014-09-12 2016-03-22 엘지전자 주식회사 공기 조화기의 실외기

Non-Patent Citations (1)

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

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