EP3870016A1 - A heat pump dishwasher comprising a defrost receptacle - Google Patents

A heat pump dishwasher comprising a defrost receptacle

Info

Publication number
EP3870016A1
EP3870016A1 EP19778478.8A EP19778478A EP3870016A1 EP 3870016 A1 EP3870016 A1 EP 3870016A1 EP 19778478 A EP19778478 A EP 19778478A EP 3870016 A1 EP3870016 A1 EP 3870016A1
Authority
EP
European Patent Office
Prior art keywords
receptacle
evaporator
defrost
water
dishwasher
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.)
Withdrawn
Application number
EP19778478.8A
Other languages
German (de)
French (fr)
Inventor
Onur Poyraz
Erkan KUTUK
Emre SAGLICAN
Husnu Kerpicci
Semih GUREL
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 AS filed Critical Arcelik AS
Publication of EP3870016A1 publication Critical patent/EP3870016A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4291—Recovery arrangements, e.g. for the recovery of energy or water
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4285—Water-heater arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

Definitions

  • the present invention relates to a heat pump dishwasher.
  • the heat pump system in the heat pump dishwashers is composed of a compressor which pressurizes the refrigerant and provides the circulation thereof, flow tubes wherein the refrigerant circulates, a condenser, an evaporator, and an expansion element.
  • the water heating process is realized by means of the heat pump system.
  • the evaporator in the heat pump system draws heat from the environment while the condenser transfers heat to the washing water.
  • the evaporator tubes are colder than the ambient air. Thus, the evaporator draws heat from the air passed thereover.
  • the water vapor in the ambient air condenses on the evaporator surfaces, forming water droplets. Said water droplets generated during the normal operation are collected in the condensation receptacle.
  • the evaporator surfaces get colder than normal.
  • the evaporator cools down excessively and a frost layer is formed on the evaporator surfaces instead of water droplets.
  • the frost layer fills in the spaces between the evaporator fins and prevents the air flow.
  • the heat absorption capacity of the heat pump also decreases. This causes the heat pump to be operated inefficiently, increasing the time and energy required for heating the water.
  • the Patent No. EP2594185 (B1) relates to a heat pump dishwasher.
  • the evaporator operates in the waste water tank, and thus the heat pump draws heat from the water in the waste water tank.
  • the Patent No. EP2658430 (B1) relates to a heat pump dishwasher.
  • the evaporator and the condenser are disposed in separate water tanks.
  • the aim of the present invention is the realization of a heat pump dishwasher wherein the problem of frost in the evaporator is eliminated, thus decreasing energy consumption.
  • the dishwasher realized in order to attain the aim of the present invention is of heat pump type, and comprises a compressor, a condenser, and an evaporator which is composed of refrigerant tubes and fins.
  • a defrost receptacle is placed onto the evaporator and water is filled into the defrost receptacle. With the heat transfer from the defrost receptacle to the evaporator, the problem of frost on the evaporator is eliminated.
  • alternatives for supplying water to the defrost receptacle and heating the water in the defrost receptacle are proposed.
  • Figure 1 - is the schematic view of a heat pump dishwasher.
  • Figure 2 - is the schematic view of the dishwasher in an embodiment of the present invention.
  • Figure 3 - is the schematic view of the evaporator and the defrost receptacle which is placed thereon.
  • Figure 4 - is the schematic view of the dishwasher in another embodiment of the present invention.
  • Figure 5 - is the schematic view of the dishwasher in another embodiment of the present invention.
  • Figure 6 - is the schematic view of the heat pump system in an embodiment of the present invention.
  • the dishwasher (1) comprises a tub (2) wherein the washing process is performed; a circulation pump (3) which provides the delivery of the washing water into the washing environment in the tub (2); at least one rack (4) wherein the items to be washed are placed; at least one spray arm (5) which provides the delivery of the washing water to the racks (4); and a heat pump (6) which heats the washing water.
  • the heat pump system (6) comprises a compressor (7) which performs the refrigerant cycle; an electronic card (8) which controls the compressor (7); a condenser (9) which is used for heating the washing water; an evaporator (12) which draws heat from the outer environment and transfers the same to the condenser (9) and which is composed of fins (10) and refrigerant tubes (11); at least one fan (13) which provides the heat transfer by blowing the ambient air onto the evaporator (12); an expansion element (14), for example a capillary tube or an expansion valve, which is disposed between the condenser (9) and the evaporator (12); and a condensation receptacle wherein the water condensing on the evaporator (12) is collected.
  • a compressor (7) which performs the refrigerant cycle
  • an electronic card (8) which controls the compressor (7)
  • a condenser (9) which is used for heating the washing water
  • an evaporator (12) which draws heat from the outer environment and transfers the same
  • the dishwasher (1) of the present invention comprises
  • control unit (not shown in figures) which, if it is detected that frost appears on the evaporator (12) according to the data received from the temperature sensor (15), provides that the defrost receptacle (16) is filled with water and that the frost on the evaporator (12) is removed by means of the heat transfer between the defrost receptacle (16) and the evaporator (12).
  • the defrost receptacle (16) is placed on the horizontal surface formed by the upper edges of the fins (10) in the evaporator (12) ( Figure 3).
  • control unit if it is detected that frost appears on the evaporator (12) by the temperature sensor (15), provides the delivery of the water taken from the water mains tap (17) to the defrost receptacle (16) ( Figure 1).
  • the dishwasher (1) comprises a water tank (18) which enables the water to be collected before the washing process and brought to the ambient temperature and thus shortening the water heating time during the washing process and providing savings in energy, and the control unit, if it is detected that frost appears on the evaporator (12) by the temperature sensor (15), provides the delivery of the water in the water tank (18) to the defrost receptacle (16) ( Figure 2).
  • the defrost receptacle (16) is placed onto the fins of the evaporator (12) in order to prevent frost formation on the evaporator (12).
  • water is filled into the defrost receptacle (16) from the water mains tap (17) or the water tank (18) by means of state of the art water transfer methods.
  • the frost layer forms at 0°C and at temperatures below 0°C.
  • the defrost receptacle (16) comprises a plurality of extensions (19) which extend in between the fins (10) in a direction perpendicular to the lower surface thereof seated on the evaporator (12) and which enable the amount of heat transfer from the defrost receptacle (16) to the evaporator (12) to be increased by contacting the fins (10).
  • the extensions (19) increase the contact surface area between the defrost receptacle (16) base and the evaporator (12) fins (10), hence increasing the amount of heat transfer (Figure 3).
  • At least one arm of the refrigerant tube (11) in the evaporator (12) is positioned in the defrost receptacle (16) ( Figure 6).
  • the refrigerant tube (11) arm positioned in the defrost receptacle (16) increases the amount of heat transfer from the water, thus decreasing the defrost time in the evaporator (12).
  • a resistance heater is placed into the defrost receptacle (16).
  • the dishwasher (1) comprises a water heating line (20) which provides heat transfer from the tub (2) to the defrost receptacle (16), with one end extending into the washing environment in the tub (2) and the other end contacting (immersed in) the water in the defrost receptacle (16) ( Figure 4).
  • the dishwasher (1) comprises a container (21) which is disposed on the compressor (7) and/or the electronic card (8) and a water heating line (20) which provides heat transfer from the container (21) to the defrost receptacle (16), with one end contacting (immersed in) the water heated in the container (21) and the other end contacting (immersed in) the water in the defrost receptacle (16) ( Figure 5).
  • the amount of heat transfer from the defrost receptacle (16) to the evaporator (12) must be increased.
  • the temperature of the water in the defrost receptacle (16) is increased with the heat transferred by means of the water heating line (20) from the tub (2) or the container (21) placed on the compressor (7) and/or the electronic card (8).
  • the water heating line (20) is produced from a tube wherein water or a fluid with high heat transfer coefficient is circulated by means of a pump.
  • the water heating line (20) is produced from a metal tube or a metal wire with high heat transfer coefficient.
  • the frost layer forming on the evaporator (12) surfaces can be detected, and the detected frost layer is melted, thus providing the efficient operation of the heat pump system (6) and decreasing energy consumption.

Landscapes

  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Washing And Drying Of Tableware (AREA)

Abstract

The present invention relates to a heat pump dishwasher (1) comprising a tub (2); a circulation pump (3) which provides the delivery of the washing water into the washing environment in the tub (2); at least one rack (4) wherein the items to be washed are placed; at least one spray arm (5) which provides the delivery of the washing water to the racks (4); a compressor (7) which performs the refrigerant cycle; a condenser (9); an evaporator (12) which draws heat from the outer environment; a temperature sensor (15), and a defrost receptacle (16) which is placed on the evaporator (12).

Description

    A HEAT PUMP DISHWASHER COMPRISING A DEFROST RECEPTACLE
  • The present invention relates to a heat pump dishwasher.
  • The heat pump system in the heat pump dishwashers is composed of a compressor which pressurizes the refrigerant and provides the circulation thereof, flow tubes wherein the refrigerant circulates, a condenser, an evaporator, and an expansion element. In the heat pump dishwashers, the water heating process is realized by means of the heat pump system. The evaporator in the heat pump system draws heat from the environment while the condenser transfers heat to the washing water. The evaporator tubes are colder than the ambient air. Thus, the evaporator draws heat from the air passed thereover. During this process, the water vapor in the ambient air condenses on the evaporator surfaces, forming water droplets. Said water droplets generated during the normal operation are collected in the condensation receptacle. When the air of the environment wherein the dishwasher is installed gets colder in winter months, the evaporator surfaces get colder than normal. In case air flow is restricted due to the position of the dishwasher, the evaporator cools down excessively and a frost layer is formed on the evaporator surfaces instead of water droplets. The frost layer fills in the spaces between the evaporator fins and prevents the air flow. In this case, as the amount of air which can be passed over the evaporator decreases, the heat absorption capacity of the heat pump also decreases. This causes the heat pump to be operated inefficiently, increasing the time and energy required for heating the water.
  • The Patent No. EP2594185 (B1) relates to a heat pump dishwasher. The evaporator operates in the waste water tank, and thus the heat pump draws heat from the water in the waste water tank.
  • The Patent No. EP2658430 (B1) relates to a heat pump dishwasher. The evaporator and the condenser are disposed in separate water tanks.
  • The aim of the present invention is the realization of a heat pump dishwasher wherein the problem of frost in the evaporator is eliminated, thus decreasing energy consumption.
  • The dishwasher realized in order to attain the aim of the present invention is of heat pump type, and comprises a compressor, a condenser, and an evaporator which is composed of refrigerant tubes and fins. In the embodiment of the present invention, a defrost receptacle is placed onto the evaporator and water is filled into the defrost receptacle. With the heat transfer from the defrost receptacle to the evaporator, the problem of frost on the evaporator is eliminated. In various embodiment of the present invention, alternatives for supplying water to the defrost receptacle and heating the water in the defrost receptacle are proposed.
  • The heat pump dishwasher realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
  • Figure 1 - is the schematic view of a heat pump dishwasher.
  • Figure 2 - is the schematic view of the dishwasher in an embodiment of the present invention.
  • Figure 3 - is the schematic view of the evaporator and the defrost receptacle which is placed thereon.
  • Figure 4 - is the schematic view of the dishwasher in another embodiment of the present invention.
  • Figure 5 - is the schematic view of the dishwasher in another embodiment of the present invention.
  • Figure 6 - is the schematic view of the heat pump system in an embodiment of the present invention.
  • The elements illustrated in the figures are numbered as follows:
    1. Dishwasher
    2. Tub
    3. Circulation pump
    4. Rack
    5. Spray arm
    6. Heat pump system
    7. Compressor
    8. Electronic card
    9. Condenser
    10. Fin
    11. Refrigerant tube
    12. Evaporator
    13. Fan
    14. Expansion element
    15. Temperature sensor
    16. Defrost receptacle
    17. Water mains tap
    18. Water tank
    19. Extension
    20. Water heating line
    21. Container
  • The dishwasher (1) comprises a tub (2) wherein the washing process is performed; a circulation pump (3) which provides the delivery of the washing water into the washing environment in the tub (2); at least one rack (4) wherein the items to be washed are placed; at least one spray arm (5) which provides the delivery of the washing water to the racks (4); and a heat pump (6) which heats the washing water.
  • The heat pump system (6) comprises a compressor (7) which performs the refrigerant cycle; an electronic card (8) which controls the compressor (7); a condenser (9) which is used for heating the washing water; an evaporator (12) which draws heat from the outer environment and transfers the same to the condenser (9) and which is composed of fins (10) and refrigerant tubes (11); at least one fan (13) which provides the heat transfer by blowing the ambient air onto the evaporator (12); an expansion element (14), for example a capillary tube or an expansion valve, which is disposed between the condenser (9) and the evaporator (12); and a condensation receptacle wherein the water condensing on the evaporator (12) is collected.
  • The dishwasher (1) of the present invention comprises
  • - at least one temperature sensor (15) which contacts the evaporator (12),
  • - a defrost receptacle (16) which is placed over the evaporator (12), and
  • - a control unit (not shown in figures) which, if it is detected that frost appears on the evaporator (12) according to the data received from the temperature sensor (15), provides that the defrost receptacle (16) is filled with water and that the frost on the evaporator (12) is removed by means of the heat transfer between the defrost receptacle (16) and the evaporator (12).
  • In an embodiment of the present invention, the defrost receptacle (16) is placed on the horizontal surface formed by the upper edges of the fins (10) in the evaporator (12) (Figure 3).
  • In another embodiment of the present invention, the control unit, if it is detected that frost appears on the evaporator (12) by the temperature sensor (15), provides the delivery of the water taken from the water mains tap (17) to the defrost receptacle (16) (Figure 1).
  • In another embodiment of the present invention, the dishwasher (1) comprises a water tank (18) which enables the water to be collected before the washing process and brought to the ambient temperature and thus shortening the water heating time during the washing process and providing savings in energy, and the control unit, if it is detected that frost appears on the evaporator (12) by the temperature sensor (15), provides the delivery of the water in the water tank (18) to the defrost receptacle (16) (Figure 2).
  • In the dishwasher (1), the defrost receptacle (16) is placed onto the fins of the evaporator (12) in order to prevent frost formation on the evaporator (12). When the frost layer forms on the evaporator (12), water is filled into the defrost receptacle (16) from the water mains tap (17) or the water tank (18) by means of state of the art water transfer methods. The frost layer forms at 0°C and at temperatures below 0°C. As the temperature of the water supplied from the water mains tap (17) or the water tank (18) is higher than 0°C, heat transfer occurs between the defrost receptacle (16) and the evaporator (12), thus the frost on the evaporator (12) is melted and the water is transferred to the condensation receptacle (not shown in figures) under the evaporator (12).
  • In another embodiment of the present invention, the defrost receptacle (16) comprises a plurality of extensions (19) which extend in between the fins (10) in a direction perpendicular to the lower surface thereof seated on the evaporator (12) and which enable the amount of heat transfer from the defrost receptacle (16) to the evaporator (12) to be increased by contacting the fins (10). The extensions (19) increase the contact surface area between the defrost receptacle (16) base and the evaporator (12) fins (10), hence increasing the amount of heat transfer (Figure 3).
  • In another embodiment of the present invention, at least one arm of the refrigerant tube (11) in the evaporator (12) is positioned in the defrost receptacle (16) (Figure 6). The refrigerant tube (11) arm positioned in the defrost receptacle (16) increases the amount of heat transfer from the water, thus decreasing the defrost time in the evaporator (12). In another embodiment of the present invention, a resistance heater is placed into the defrost receptacle (16).
  • In another embodiment of the present invention, the dishwasher (1) comprises a water heating line (20) which provides heat transfer from the tub (2) to the defrost receptacle (16), with one end extending into the washing environment in the tub (2) and the other end contacting (immersed in) the water in the defrost receptacle (16) (Figure 4).
  • In another embodiment of the present invention, the dishwasher (1) comprises a container (21) which is disposed on the compressor (7) and/or the electronic card (8) and a water heating line (20) which provides heat transfer from the container (21) to the defrost receptacle (16), with one end contacting (immersed in) the water heated in the container (21) and the other end contacting (immersed in) the water in the defrost receptacle (16) (Figure 5).
  • In case the temperature of the evaporator (12) decreases excessively and a dense frost layer forms, the amount of heat transfer from the defrost receptacle (16) to the evaporator (12) must be increased. In the embodiments disclosed in the two paragraphs above, the temperature of the water in the defrost receptacle (16) is increased with the heat transferred by means of the water heating line (20) from the tub (2) or the container (21) placed on the compressor (7) and/or the electronic card (8).
  • In an embodiment of the present invention, the water heating line (20) is produced from a tube wherein water or a fluid with high heat transfer coefficient is circulated by means of a pump.
  • In another embodiment of the present invention, the water heating line (20) is produced from a metal tube or a metal wire with high heat transfer coefficient.
  • By means of the present invention, in the dishwasher (1), the frost layer forming on the evaporator (12) surfaces can be detected, and the detected frost layer is melted, thus providing the efficient operation of the heat pump system (6) and decreasing energy consumption.

Claims (11)

  1. A dishwasher (1) comprising a tub (2); a circulation pump (3), at least one rack (4), at least one spray arm (5), and a compressor (7), an electronic card (8) which controls the compressor (7), a condenser (9), and an evaporator (12) which draws heat from the outer environment and transfers the same to the condenser (9) and which is composed of fins (10) and refrigerant tubes (11), which all together form the heat pump system (6), characterized by
    - at least one temperature sensor (15) which contacts the evaporator (12),
    - a defrost receptacle (16) which is placed over the evaporator (12), and
    - a control unit which, if it is detected that frost appears on the evaporator (12) according to the data received from the temperature sensor (15), provides that the defrost receptacle (16) is filled with water and that the frost on the evaporator (12) is removed by means of the heat transfer between the defrost receptacle (16) and the evaporator (12).
  2. A dishwasher (1) as in Claim 1, characterized by the defrost receptacle (16) which is placed on the horizontal surface formed by the upper edges of the fins (10) in the evaporator (12).
  3. A dishwasher (1) as in Claim 1 or 2, characterized by the control unit, if it is detected that frost appears on the evaporator (12), provides the delivery of the water taken from the water mains tap (17) to the defrost receptacle (16).
  4. A dishwasher (1) as in Claim 1 or 2, characterized by a water tank (18) and by the control unit, if it is detected that frost appears on the evaporator (12), provides the delivery of the water in the water tank (18) to the defrost receptacle (16).
  5. A dishwasher (1) as in Claim 1 or 2, characterized by a plurality of extensions (19) which extend in between the fins (10) in a direction perpendicular to the lower surface thereof seated on the evaporator (12) and which contact the fins (10).
  6. A dishwasher (1) as in Claim 1 or 2, characterized by the defrost receptacle (16) wherein at least one arm of the refrigerant tube (11) in the evaporator (12) is positioned.
  7. A dishwasher (1) as in Claim 1 or 2, characterized by the defrost receptacle (16) wherein a resistance heater is disposed.
  8. A dishwasher (1) as in Claim 1 or 2, characterized by a water heating line (20) which provides heat transfer from the tub (2) to the defrost receptacle (16), with one end extending into the washing environment in the tub (2) and the other end contacting the water in the defrost receptacle (16).
  9. A dishwasher (1) as in Claim 1 or 2, characterized by a container (21) which is disposed on the compressor (7) and/or the electronic card (8) and a water heating line (20) which provides heat transfer from the container (21) to the defrost receptacle (16), with one end contacting the water heated in the container (21) and the other end contacting the water in the defrost receptacle (16).
  10. A dishwasher (1) as in Claim 8 or 9, characterized by the water heating line (20) which is produced from a tube wherein water or a fluid with high heat transfer coefficient is circulated by means of a pump.
  11. A dishwasher (1) as in Claim 8 or 9, characterized by the water heating line (20) which is produced from a metal tube or a metal wire with high heat transfer coefficient.
EP19778478.8A 2018-10-22 2019-09-24 A heat pump dishwasher comprising a defrost receptacle Withdrawn EP3870016A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201815717 2018-10-22
PCT/EP2019/075608 WO2020083591A1 (en) 2018-10-22 2019-09-24 A heat pump dishwasher comprising a defrost receptacle

Publications (1)

Publication Number Publication Date
EP3870016A1 true EP3870016A1 (en) 2021-09-01

Family

ID=68069759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19778478.8A Withdrawn EP3870016A1 (en) 2018-10-22 2019-09-24 A heat pump dishwasher comprising a defrost receptacle

Country Status (2)

Country Link
EP (1) EP3870016A1 (en)
WO (1) WO2020083591A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN101688731A (en) * 2007-03-06 2010-03-31 开利公司 Micro-channel evaporator with frost detection and control
DE102008015796B4 (en) * 2008-03-26 2010-03-18 Meiko Maschinenbau Gmbh & Co.Kg Automatic programmer with wastewater heat recovery
DK2206824T3 (en) * 2010-02-16 2013-10-07 V Zug Ag Household appliance with tub, heat pump and tank
EP2224049B1 (en) * 2010-06-11 2012-10-17 V-Zug AG Cleaning device with waste water tank and heat pump and method for controlling this cleaning device
EP2574266B1 (en) 2010-12-29 2015-10-21 Electrolux Home Products Corporation N.V. Heat pump ice pipe
EP2594185B1 (en) 2013-02-07 2016-03-09 V-Zug AG Cleaning device with tub, waste water tank and connecting line
EP2978360B1 (en) * 2013-03-28 2017-08-23 Electrolux Appliances Aktiebolag Heat pump washing apparatus
CN105392937A (en) * 2013-06-11 2016-03-09 伊莱克斯家用电器股份公司 Washing machine
DE102013216741B3 (en) * 2013-08-23 2014-12-11 BSH Bosch und Siemens Hausgeräte GmbH Household appliance with rinse water tank
DE102016221051A1 (en) * 2016-10-26 2018-04-26 BSH Hausgeräte GmbH Dishwasher with heat pump

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