EP2703551B1 - Cooling system for a heat pump drier and heat pump drier using such cooling system - Google Patents
Cooling system for a heat pump drier and heat pump drier using such cooling system Download PDFInfo
- Publication number
- EP2703551B1 EP2703551B1 EP12182905.5A EP12182905A EP2703551B1 EP 2703551 B1 EP2703551 B1 EP 2703551B1 EP 12182905 A EP12182905 A EP 12182905A EP 2703551 B1 EP2703551 B1 EP 2703551B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- condenser
- heat pump
- cooling system
- pump drier
- evaporator
- 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
Links
- 238000001816 cooling Methods 0.000 title claims description 13
- 238000005057 refrigeration Methods 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 239000003507 refrigerant Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/20—General details of domestic laundry dryers
- D06F58/206—Heat pump arrangements
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/50—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to heat pumps, e.g. pressure or flow rate
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/26—Heat pumps
Definitions
- the present invention relates to a cooling system for a heat pump drier, comprising a refrigeration circuit including a compressor, a condenser and an evaporator.
- the present invention relates also to a heat pump drier having such cooling system as well.
- This type of cooling system is used in recent driers due to the increased energy efficiency obtained though a heat pump.
- the cooling system is not only used to remove water by condensation on evaporator surface from the warm air downstream the drier drum, but also for heating air upstream the drier drum thanks to the heat released by the condenser of the cooling system.
- WO 2009/016173 A1 discloses a heat pump washer/dryer having a valve and throttle elements between the condenser and the evaporator of the heat pump circuit in order to maintain different levels of pressure and temperature decreases of the refrigerant fluid.
- An object of the invention is to present a cooling system of the type mentioned above which does not present the above problems. Such object is obtained thanks to features listed in the appended claims.
- One of the features of the invention is to create a by-pass of a portion of the condenser, so that condenser heat exchange performances are reduced or increased simply by driving an electro-valve which directs the flow of refrigerant fluid through the by-pass or through the entire condenser.
- electro-valve deviates refrigerant flow in order to by-pass part of the condenser pipes.
- electrovalve deviates refrigerant flow in order to include all condenser pipes. In this way cost and complexity compared to present solution are greatly reduced.
- a heat pump drier having a drum 12 in which laundry to be dried is loaded.
- a process air circuit 14 comprises conduits for conveying air (through the driving action of a blower - not shown) from the drum to a series of heat exchangers 16, 18 and 20 before entering again the drum 12.
- the drier 10 comprises also a refrigeration circuit 22 having a compressor 24, a condenser 26 and an evaporator 28.
- the condenser 26 is preferably part of the heat exchanger 18, while the evaporator 28 is part of the heat exchanger 16.
- the third heat exchanger 20 upstream the drum 12 air is heated by an electric heater (not shown) in case the heat exchanger 18 cannot guarantee the desired temperature of air entering the drum 12.
- the condenser 26 is cooled by a fan 30 which is switched on or off depending on the thermal balance of the drier.
- the refrigeration circuit comprises also a filter 17 and a capillary 19 upstream the evaporator 28.
- a three-way valve 32 upstream the condenser in the refrigeration circuit 22 it is placed a three-way valve 32 which can direct the flow of refrigerant towards the condenser or toward a by-bass pipe 34 which is connected to a predetermined portion of the condenser 26, i.e. at a predetermined distance from the inlet point.
- the temperature sensor 36 is placed at the outlet of the condenser 26 upstream the capillary inlet, but it can be placed in a different position as well.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
Description
- The present invention relates to a cooling system for a heat pump drier, comprising a refrigeration circuit including a compressor, a condenser and an evaporator. The present invention relates also to a heat pump drier having such cooling system as well.
- This type of cooling system is used in recent driers due to the increased energy efficiency obtained though a heat pump. The cooling system is not only used to remove water by condensation on evaporator surface from the warm air downstream the drier drum, but also for heating air upstream the drier drum thanks to the heat released by the condenser of the cooling system.
- In the overall thermal load balance of a heat pump drier the heat of the warm air is not only removed through the evaporator, but also through the condenser since heat taken by evaporator is not sufficient to reach such thermal load balance. Therefore the heat exchange through the condenser has to be increased or reduced according to the working condition of the drier.
- In the known solutions, in order to properly adjust said heat balance, a fan blowing air on the condenser is used; when extra heat has to be removed (this being sensed by usual sensors in the air circuit or in the cooling circuit, for instance a temperature sensor or a pressure sensor downstream the evaporator), fan is activated or its speed increased in order to improve heat exchange on the condenser. Similarly, for solving the same problem an additional condenser is used, usually known as post-condenser. The above known solutions increase complexity of the system and therefore the overall cost thereof.
-
WO 2009/016173 A1 discloses a heat pump washer/dryer having a valve and throttle elements between the condenser and the evaporator of the heat pump circuit in order to maintain different levels of pressure and temperature decreases of the refrigerant fluid. - An object of the invention is to present a cooling system of the type mentioned above which does not present the above problems. Such object is obtained thanks to features listed in the appended claims.
- One of the features of the invention is to create a by-pass of a portion of the condenser, so that condenser heat exchange performances are reduced or increased simply by driving an electro-valve which directs the flow of refrigerant fluid through the by-pass or through the entire condenser. When the system requires a low heat exchange, electro-valve deviates refrigerant flow in order to by-pass part of the condenser pipes. On the other hand, when high heat exchange is required, electrovalve deviates refrigerant flow in order to include all condenser pipes. In this way cost and complexity compared to present solution are greatly reduced.
- Further advantages and features according to the present invention will become clear from the following detailed description, with reference to the attached drawings, in which:
-
Figure 1 is a schematic view of a heat pump drier according to prior art; -
Figure 2 is a detailed view of the heat pump circuit used in the drier offigure 1 ; -
Figure 3 is a schematic view of a heat pump direr according to the present invention; and -
Figure 4 is a detailed view of the heat pump circuit used in the drier offigure 3 . - With reference to the drawings, with 10 it is indicated a heat pump drier having a
drum 12 in which laundry to be dried is loaded. Aprocess air circuit 14 comprises conduits for conveying air (through the driving action of a blower - not shown) from the drum to a series ofheat exchangers drum 12. Thedrier 10 comprises also arefrigeration circuit 22 having acompressor 24, acondenser 26 and anevaporator 28. Thecondenser 26 is preferably part of theheat exchanger 18, while theevaporator 28 is part of theheat exchanger 16. In thethird heat exchanger 20 upstream thedrum 12 air is heated by an electric heater (not shown) in case theheat exchanger 18 cannot guarantee the desired temperature of air entering thedrum 12. - In the prior art solution of
figures 1 and2 , thecondenser 26 is cooled by afan 30 which is switched on or off depending on the thermal balance of the drier. The refrigeration circuit comprises also afilter 17 and acapillary 19 upstream theevaporator 28. According to the present invention (figures 3 and4 ), upstream the condenser in therefrigeration circuit 22 it is placed a three-way valve 32 which can direct the flow of refrigerant towards the condenser or toward a by-bass pipe 34 which is connected to a predetermined portion of thecondenser 26, i.e. at a predetermined distance from the inlet point. By driving thevalve 32, by means of acontrol process unit 35 linked to atemperature sensor 36, it is then possible to change the heat dissipation performances in the condenser itself, allowing an easy control of thermal balance. Thetemperature sensor 36 is placed at the outlet of thecondenser 26 upstream the capillary inlet, but it can be placed in a different position as well. - Instead of using a three way valve, it is possible to use a multi-way valve or a plurality of valves which can direct the flow of refrigerant to different by-pass pipes and to different point of the condenser, in order to allow a more granular regulation.
Claims (8)
- Cooling system for a heat pump drier, comprising a refrigeration circuit (22) including a compressor (24), a condenser (26) and an evaporator (28), characterized in that said refrigeration circuit (22) comprises a by-pass valve (32) upstream the condenser (26) and adapted to by-bass part of the condenser (26) pipes.
- Cooling system according to clam 1, wherein the by-pass valve is a three-way valve connected to a by-pass conduit (34) which enter the condenser (26) at a predetermined distance from the inlet point.
- Heat pump drier (10) comprising a drum (12), a process air circuit (14) for circulating air through the drum (12) and a cooling system having a refrigeration circuit (22) with a compressor (24), a condenser (26) and an evaporator (28), characterized in that it comprises a cooling system having the features of claim 1.
- Heat pump drier (10) according to claim 3, wherein the by-pass valve is a three-way valve connected to a by-pass conduit (34) which enter the condenser (26) at a predetermined distance from the inlet point.
- Heat pump drier according to claim 3 or 4, wherein the process air circuit (14) comprises a portion (16) downstream the drum (12) in heat exchange relationship with the evaporator (28).
- Heat pump drier according to claim 5, wherein the process air circuit (14) comprises a portion (18) upstream the drum (12) in heat exchange relationship with the condenser (26).
- Heat pump drier according to any claims 3-6, wherein the refrigeration circuit (22) comprises a temperature sensor (36) connected to a control unit (35) for driving the by-pass valve (32).
- Heat pump drier according to claim 7, wherein the temperature sensor (36) is placed downstream the condenser (26) and upstream the evaporator (28).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL12182905T PL2703551T3 (en) | 2012-09-04 | 2012-09-04 | Cooling system for a heat pump drier and heat pump drier using such cooling system |
EP12182905.5A EP2703551B1 (en) | 2012-09-04 | 2012-09-04 | Cooling system for a heat pump drier and heat pump drier using such cooling system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12182905.5A EP2703551B1 (en) | 2012-09-04 | 2012-09-04 | Cooling system for a heat pump drier and heat pump drier using such cooling system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2703551A1 EP2703551A1 (en) | 2014-03-05 |
EP2703551B1 true EP2703551B1 (en) | 2015-01-28 |
Family
ID=46800102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12182905.5A Active EP2703551B1 (en) | 2012-09-04 | 2012-09-04 | Cooling system for a heat pump drier and heat pump drier using such cooling system |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2703551B1 (en) |
PL (1) | PL2703551T3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014223569A1 (en) | 2014-11-19 | 2016-05-19 | BSH Hausgeräte GmbH | Clothes drying apparatus and method for operating a laundry drying apparatus |
CN108425222B (en) * | 2017-02-13 | 2021-09-07 | 青岛海尔洗涤电器有限公司 | Energy-saving clothes dryer |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3306455B2 (en) * | 1993-03-04 | 2002-07-24 | 株式会社日立製作所 | Air conditioner |
CN100453922C (en) * | 2004-04-09 | 2009-01-21 | 松下电器产业株式会社 | Drying equipment |
EP2171150B1 (en) * | 2007-08-02 | 2010-11-10 | Arçelik Anonim Sirketi | A washer/dryer |
-
2012
- 2012-09-04 PL PL12182905T patent/PL2703551T3/en unknown
- 2012-09-04 EP EP12182905.5A patent/EP2703551B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2703551A1 (en) | 2014-03-05 |
PL2703551T3 (en) | 2015-04-30 |
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