EP0477475B1 - Kältekreislauf und Abtauverfahren dazu - Google Patents
Kältekreislauf und Abtauverfahren dazu Download PDFInfo
- Publication number
- EP0477475B1 EP0477475B1 EP91110116A EP91110116A EP0477475B1 EP 0477475 B1 EP0477475 B1 EP 0477475B1 EP 91110116 A EP91110116 A EP 91110116A EP 91110116 A EP91110116 A EP 91110116A EP 0477475 B1 EP0477475 B1 EP 0477475B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- evaporator
- compressor
- frosting
- gas
- refrigeration circuit
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
Definitions
- This invention relates to a refrigeration circuit as defined in the precharacterising part of claim 1.
- the invention also relates to a refrigerated counter having such a refrigeration circuit and comprising a series of a first evaporator operating in conductive heat transfer with one or more walls of the counter and with a second finned or convective transfer evaporator which, in operation of the refrigerated counter, is swept by a forced air flow to enhance the convective heat transfer.
- the invention further relates to a method of de-frosting such circuit and counter.
- This operation is usually performed through heater means incorporated to the counter itself.
- a known technical solution for meeting this demand provides for the conveying of all the "hot" refrigerating gas available at the compressor outlet through both evaporators, bypassing the condenser.
- the circuit ceases to operate in accord with a refrigeration cycle throughout the duration of the de-frosting step. It follows that the heat available to de-frost is that deriving from the energy dissipated by the compressor. In addition, both evaporators are de-frosted, and this unavoidably involves a longer de-frosting time and longer pickup time for the refrigeration cycle to recover its running temperature.
- the technical problem addressed by this invention is to provide a refrigeration circuit having such structural and functional characteristics as to overcome the above-mentioned drawbacks with which the prior art is beset.
- the solutive idea on which the invention stands consists of tapping off a fraction of the "hot” refrigerating gas downstream from the compressor, while the remainder is allowed to carry on the refrigeration cycle, and admixing it, upstream of the second evaporator, to the "cool" refrigerating gas from the first evaporator.
- a pre-set solenoid valve is provided in the said bypass connection.
- a method of de-frosting a refrigeration circuit comprising a refrigerating gas compressor, a condenser, and a first evaporator and at least one second evaporator connected serially to each other, characterized by tapping off some of the refrigerating gas downstream from the compressor and supplying the second evaporator with a mixture of said gas and gas exiting the first evaporator.
- a refrigeration circuit embodying this invention is intended for installation in a refrigerated display counter 2 of which the remaining structural elements are conventional.
- the circuit 1 utilizes the properties of a suitable conventional refrigerating fluid, such as freon, which forms the working fluid through the operation cycles to be described.
- a suitable conventional refrigerating fluid such as freon
- the circuit 1 comprises a compressor 3 having an outlet 4 in fluid communication with the inlet 9 of a condenser 5. Said condenser is cooled by a fan 6 driven by a motor 7.
- the condenser has an outlet 8 connected to the inlet 19 of a first evaporator 10 through a series of a de-watering filter 11 and a capillary 12.
- the evaporator 10 is placed in substantial contact with a vat-like wall 25 of the counter 2 intended to contain the products to be preserved, in an essentially conductive heat transfer relationship with that wall 25.
- This first evaporator 10 is connected serially to a second, finned evaporator 13 which is in a substantially convective heat transfer relationship with its environment.
- This second evaporator has an outlet 14 connected to the inlet of the compressor 3.
- the circuit 1 comprises de-frosting means 15 for the evaporator 13.
- Such means 15 comprise a one-way bypass connection 17 between the outlet 4 of the compressor 3 and the inlet of the second evaporator 13.
- a solenoid valve 16 which is pre-set at a selected flow rate of the refrigerating fluid below the overall flow rate at the delivery outlet of the compressor 3, is provided in the connection 17.
- the circuit 1 is essentially composed of a pair of circuit links 18, 20.
- the first link 18 comprises the compressor 3, valve 16, and second evaporator 13; and the second link 20 includes, in turn, the compressor 3, condenser 5, and series of the evaporators 10, 13.
- valve 16 When it is desired to start de-frosting the counter 2, the valve 16 is operated to an open position, and some of the fluid exiting the compressor 3 is tapped off the second circuit link 20 and directed into the second evaporator 13, over the connection 17.
- the second evaporator 13 is supplied with a comparatively warm fluid consisting of the fluid exiting the first evaporator 10 and the fluid delivered from the compressor 3, mixed together.
- the invention solves the aforementioned technical problem in a cost-efficient and effective manner.
- a major advantage of the refrigeration circuit of this invention is that during the step of de-frosting the second evaporator, at least some of the refrigerating fluid is caused to undergo a normal refrigeration cycle, thereby enhancing the overall efficiency of the circuit.
- the first evaporator that is the one directly contacting the products preserved in the refrigerated counter, will undergo no heating. This fact, besides affording quicker restoration of the cooling cycle, also prevents the products preserved under the counter from becoming heated and possibly damaged while de-frosting.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Claims (5)
- Kältekreislauf, insbesondere zum Einbau in Tiefkühltheken, wobei der Kreislauf einen Kühlgas-Kompressor (3), einen Verflüssiger (5), einen ersten Verdampfer (10) und zumindest einen zweiten Verdampfer (13), die in Reihe miteinander verbunden sind, und einer Verdampfer-Abtaueinrichtung, aufweist, und wobei die Abtaueinrichtung einen Nebenschluß (17) zwischen dem Auslaß des Kompressors (3) und dem Einlaß des zweiten Verdampfers (13) besitzt,
dadurch gekennzeichnet,
daß der Nebenschluß (17) einen Teil des von dem Kompressor (3) komprimierten Kühlgases unter Umgehung des Verflüssigers (5) und des ersten Verdampfers (10) im gasförmigen Zustand zu dem zweiten Verdampfer (13) leitet, wobei der Rest des Gases durch den Verflüssiger und den ersten Verdampfer zu dem zweiten Verdampfer geleitet wird, wenn die Abtaueinrichtung aktiviert ist. - Kältekreislauf gemäß Anspruch 1,
dadurch gekennzeichnet,
daß in dem Nebenschluß (17) ein Ventil (16) vorgesehen ist, das auf eine bestimmte Gasflußrate eingestellt ist, die unter der Gesamtflußrate des Kompressors (5) liegt. - Tiefkühltheke,
dadurch gekennzeichnet,
daß sie einen Kühlkreislauf (1) gemäß Anspruch 1 oder 2 aufweist. - Tiefkühltheke gemäß Anspruch 3, wobei der erste Verdampfer (10) wärmeleitend mit einer oder mehreren Wänden (25) der Theke verbunden ist, und wobei die Wärmeübertragung beim zweiten Verdampfer (13) durch Lamellen oder durch Konvektion erfolgt.
- Verfahren zum Abtauen eines Kühlkreislaufes mit einem Kühlgaskompressor, einem Verflüssiger, und einem ersten Verdampfer und zumindest einem zweiten Verdampfer, die in Reihe miteinander verbunden sind,
dadurch gekennzeichnet,
daß ein Teil des Kühlgases stromabwärts des Kompressors abgezapft wird, und daß eine Mischung von diesem Teil des Gases mit aus dem ersten Verdampfer kommenden Gas dem zweiten Verdampfer zugeführt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT4169990 | 1990-09-28 | ||
IT04169990A IT1244107B (it) | 1990-09-28 | 1990-09-28 | Circuito frigorifero perfezionato e relativo metodo di sbrinamento |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0477475A2 EP0477475A2 (de) | 1992-04-01 |
EP0477475A3 EP0477475A3 (en) | 1992-09-02 |
EP0477475B1 true EP0477475B1 (de) | 1994-12-21 |
Family
ID=11253142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91110116A Expired - Lifetime EP0477475B1 (de) | 1990-09-28 | 1991-06-20 | Kältekreislauf und Abtauverfahren dazu |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0477475B1 (de) |
AT (1) | ATE116054T1 (de) |
DE (1) | DE69106096T2 (de) |
DK (1) | DK0477475T3 (de) |
ES (1) | ES2066276T3 (de) |
IT (1) | IT1244107B (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8821462B2 (en) | 2007-08-21 | 2014-09-02 | Ostomycure As | Percutaneous abdominal implant |
USD743552S1 (en) | 2013-04-30 | 2015-11-17 | Ostomycure As | Adaptor for an ostomy implant |
USD752750S1 (en) | 2013-04-30 | 2016-03-29 | Ostomycure As | Implants |
US9615961B2 (en) | 2011-03-25 | 2017-04-11 | Ostomycure As | Percutaneous implant and ostomy method |
USD827824S1 (en) | 2013-04-30 | 2018-09-04 | Ostomycure As | Implant with internal porous surface structure |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994020803A1 (en) * | 1993-03-08 | 1994-09-15 | Greenhalgh Refrigeration Pty Ltd | Refrigeration process and apparatus |
JPH08327169A (ja) * | 1994-08-31 | 1996-12-13 | Nippondenso Co Ltd | 冷凍装置 |
KR20040020618A (ko) * | 2002-08-31 | 2004-03-09 | 삼성전자주식회사 | 냉장고 |
US7370490B2 (en) * | 2005-06-30 | 2008-05-13 | Zhiming Li | Air-conditioning system with full heat recovery |
JP2007040658A (ja) * | 2005-08-05 | 2007-02-15 | Matsushita Electric Ind Co Ltd | 空気調和装置 |
ATE525046T1 (de) | 2006-02-28 | 2011-10-15 | Ostomycure As | Implantat |
CN102003842B (zh) * | 2010-11-04 | 2013-04-10 | 三花控股集团有限公司 | 蒸发器和具有它的制冷系统 |
CN104848497A (zh) * | 2015-06-10 | 2015-08-19 | 广东志高暖通设备股份有限公司 | 一种空气调节器 |
CN105402937B (zh) * | 2015-12-22 | 2019-01-15 | 广东志高暖通设备股份有限公司 | 一种空调系统 |
EP3832227A4 (de) * | 2018-07-27 | 2021-08-04 | Mitsubishi Electric Corporation | Kältekreislaufvorrichtung |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2801523A (en) * | 1952-05-15 | 1957-08-06 | Charles C Hansen | Defrosting apparatus for refrigeration systems |
US2909907A (en) * | 1958-11-25 | 1959-10-27 | Whirlpool Co | Refrigerating apparatus with hot gas defrost means |
US4949554A (en) * | 1989-09-08 | 1990-08-21 | Specialty Equipment Companies, Inc. | Single pane, curved glass lid, frozen food merchandiser |
-
1990
- 1990-09-28 IT IT04169990A patent/IT1244107B/it active IP Right Grant
-
1991
- 1991-06-20 AT AT91110116T patent/ATE116054T1/de not_active IP Right Cessation
- 1991-06-20 DE DE69106096T patent/DE69106096T2/de not_active Expired - Fee Related
- 1991-06-20 EP EP91110116A patent/EP0477475B1/de not_active Expired - Lifetime
- 1991-06-20 ES ES91110116T patent/ES2066276T3/es not_active Expired - Lifetime
- 1991-06-20 DK DK91110116.0T patent/DK0477475T3/da active
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8821462B2 (en) | 2007-08-21 | 2014-09-02 | Ostomycure As | Percutaneous abdominal implant |
US9615961B2 (en) | 2011-03-25 | 2017-04-11 | Ostomycure As | Percutaneous implant and ostomy method |
USD743552S1 (en) | 2013-04-30 | 2015-11-17 | Ostomycure As | Adaptor for an ostomy implant |
USD752750S1 (en) | 2013-04-30 | 2016-03-29 | Ostomycure As | Implants |
USD788925S1 (en) | 2013-04-30 | 2017-06-06 | Ostomycure As | Implant |
USD816842S1 (en) | 2013-04-30 | 2018-05-01 | Ostomycure As | Implants |
USD827824S1 (en) | 2013-04-30 | 2018-09-04 | Ostomycure As | Implant with internal porous surface structure |
Also Published As
Publication number | Publication date |
---|---|
DE69106096D1 (de) | 1995-02-02 |
EP0477475A2 (de) | 1992-04-01 |
IT1244107B (it) | 1994-07-05 |
ATE116054T1 (de) | 1995-01-15 |
DE69106096T2 (de) | 1995-05-04 |
ES2066276T3 (es) | 1995-03-01 |
IT9041699A0 (it) | 1990-09-28 |
IT9041699A1 (it) | 1992-03-28 |
DK0477475T3 (da) | 1995-05-15 |
EP0477475A3 (en) | 1992-09-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0477475B1 (de) | Kältekreislauf und Abtauverfahren dazu | |
US6170270B1 (en) | Refrigeration system using liquid-to-liquid heat transfer for warm liquid defrost | |
US5921092A (en) | Fluid defrost system and method for secondary refrigeration systems | |
CA1090307A (en) | Control for a combination furnace and heat pump system | |
US6094925A (en) | Crossover warm liquid defrost refrigeration system | |
CA1177268A (en) | Airconditioner with refrigerant temperature responsive controller for compressor bypass valve | |
US4565070A (en) | Apparatus and method for defrosting a heat exchanger in a refrigeration circuit | |
US4474026A (en) | Refrigerating apparatus | |
JPS645717Y2 (de) | ||
US5669222A (en) | Refrigeration passive defrost system | |
CN100529586C (zh) | 冷却混合物的制冷系统 | |
US4779425A (en) | Refrigerating apparatus | |
US4949551A (en) | Hot gas defrost system for refrigeration systems | |
GB2145209A (en) | Heat pump | |
EP1293243B1 (de) | Steuerungssystem für Kältetrockner von Druckgasen | |
US4694657A (en) | Adaptive defrost control and method | |
US4271899A (en) | Heat pump control system | |
US2632304A (en) | Oil defrosting unit | |
EP0301728B1 (de) | Heissgasabtausystem für Kühlsysteme | |
US3173476A (en) | Heat pump | |
US3623334A (en) | Defrost control responsive to air pressure differential | |
US4095438A (en) | Refrigeration system with hot gas defrost | |
GB2062829A (en) | Heat pump or refrigeration circuits | |
US4192150A (en) | Defrosting arrangement for a refrigerator | |
KR100249195B1 (ko) | 냉장고 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH DE DK ES FR GB GR LI LU NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE DK ES FR GB GR LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19921030 |
|
17Q | First examination report despatched |
Effective date: 19930818 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB GR LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19941221 Ref country code: LI Effective date: 19941221 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19941221 Ref country code: FR Effective date: 19941221 Ref country code: CH Effective date: 19941221 Ref country code: BE Effective date: 19941221 |
|
REF | Corresponds to: |
Ref document number: 116054 Country of ref document: AT Date of ref document: 19950115 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 69106096 Country of ref document: DE Date of ref document: 19950202 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2066276 Country of ref document: ES Kind code of ref document: T3 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: DK Ref legal event code: T3 |
|
EN | Fr: translation not filed | ||
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19950630 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19990429 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DK Payment date: 19990511 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19990512 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19990517 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19990526 Year of fee payment: 9 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 19990607 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000620 Ref country code: DK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000620 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000620 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000621 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 20000621 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20000620 |
|
EUG | Se: european patent has lapsed |
Ref document number: 91110116.0 |
|
REG | Reference to a national code |
Ref country code: DK Ref legal event code: EBP |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010403 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20020304 |