EP1922516A2 - A cooling device - Google Patents

A cooling device

Info

Publication number
EP1922516A2
EP1922516A2 EP06795916A EP06795916A EP1922516A2 EP 1922516 A2 EP1922516 A2 EP 1922516A2 EP 06795916 A EP06795916 A EP 06795916A EP 06795916 A EP06795916 A EP 06795916A EP 1922516 A2 EP1922516 A2 EP 1922516A2
Authority
EP
European Patent Office
Prior art keywords
compressor
time
valve
cooling device
oil return
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Withdrawn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
EP06795916A
Other languages
German (de)
French (fr)
Inventor
Yalcin Guldali
Ertugrul Ustundag
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 EP1922516A2 publication Critical patent/EP1922516A2/en
Withdrawn legal-status Critical Current

Links

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
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • This invention relates to a cooling device wherein means are provided to improve the oil circulating in refrigeration cycle.
  • the refrigerant fluid circulating in refrigeration cycle is in superheated vapor phase while leaving the compressor.
  • the refrigerant fluid leaving the compressor in superheated vapor phase transforms into liquid - vapor phase in condenser and eventually into liquid phase in the neighborhood of capillary pipe inlet.
  • the fluid starts to transform into liquid - vapor phase again and reaches the evaporator in liquid - vapor phase with a low level of dryness.
  • the refrigerant fluid transformed into vapor phase under the effect of the heat drawn from the environment, reaches the compressor again.
  • JP2004-308925 wherein a description is given of an embodiment developed to regain the oil back to the compressor by changing the operation speed of the compressor according to the flow rate of the fluid in refrigeration cycle.
  • the aim of the present invention is the realization of a cooling device wherein means are provided to effectively regain the oil accumulated inside the refrigeration cycle to the compressor.
  • an oil return procedure is performed wherein the compressor is operated at a higher revolution by opening one or more than one valve, in case the compressor has been operated below a certain revolution and the specified time where a valve is to stay open decreases below a certain value or closed increases above a certain value, said valve being utilized to permit the refrigerant fluid flow to an evaporator comprised by any of the cooling compartments.
  • Fig.l - is a schematic view of a cooling device.
  • the cooling device (1) in accordance with the present invention comprises a compressor (4) used to pressurize the refrigerant fluid, a condenser (5) whereby the refrigerant fluid leaving the compressor (4) in superheated vapor phase is first condensed and transformed to liquid - vapor phase and then to completely liquid phase, one or more than one compartment (2) where items to be cooled are placed into and which incorporates one or more than one evaporator (6) whereby its environment is cooled as heat is absorbed by the refrigerant fluid circulating there inside, one or more than one valve (7) positioned between the condenser (5) and the evaporator (6), controlling the transfer of the refrigerant fluid to the evaporator (6) and, a control unit (3) used to control the open and closed time periods of each valve ( Figure 1).
  • control unit (3) realizes the oil return procedure wherein one or more than one valve (7) is opened and the compressor (4) is started to operate at a predetermined revolution for a predetermined period of time.
  • variable speed compressor In the preferred embodiment of the present invention, a variable speed compressor
  • each compartment (2) is checked by the control unit (3) and according to a predetermined order, refrigeration process is performed by varying the revolution of the compressor (4) depending on the situation of each compartment where their temperature is above or below a certain temperature value. Unless the refrigeration process applied for one compartment (2) is completed, it is not possible to continue with a refrigeration process defined for other compartments (2).
  • a minimum compressor (4) revolution interval is defined for each compartment (2). Oil return procedure is performed if the compressor (4) is operated below the mentioned interval.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)

Abstract

This invention relates to a cooling device (1) wherein it is accomplished that the life-span of the compressor (4) is increased and thus the refrigeration cycle is performed in a more effective manner as oil accumulated in the refrigeration cycle is regained by the compressor by performing an oil return procedure.

Description

Description A COOLING DEVICE
[1] This invention relates to a cooling device wherein means are provided to improve the oil circulating in refrigeration cycle.
[2] In cooling devices, the refrigerant fluid circulating in refrigeration cycle is in superheated vapor phase while leaving the compressor. The refrigerant fluid leaving the compressor in superheated vapor phase, transforms into liquid - vapor phase in condenser and eventually into liquid phase in the neighborhood of capillary pipe inlet. Along the capillary pipe, as pressure drops, the fluid starts to transform into liquid - vapor phase again and reaches the evaporator in liquid - vapor phase with a low level of dryness. The refrigerant fluid transformed into vapor phase under the effect of the heat drawn from the environment, reaches the compressor again.
[3] Inside the compressor utilized in the refrigeration cycle, there is provided a certain amount of oil whereby moveable parts are protected against high temperature effects and gas leakage from the suction and pump cavities is prevented. While the compressor pumps the refrigerant fluid into the system, certain amount of oil leaks to the refrigeration cycle, as mixed with the refrigerant fluid. Part of the oil leaked to the refrigeration cycle is plastered onto the internal surfaces of the condenser and the evaporator and part of it accumulates at sections where the temperature is relatively low and thus the viscosity is high, especially at the outlet sections and/or final bending forms of the evaporator. The movement of the oil is mostly affected by viscosity change. The higher the refrigerant fluid viscosity, the more difficult the oil returns to the compressor. The most effective factor enabling the movement of the oil at the mentioned sections towards the compressor is the sweep rate of the refrigerant fluid since it has transformed into vapor phase. The higher the sweep rate, the easier the return of the oil accumulated in the refrigeration cycle to the compressor.
[4] One of the most effective reasons of the problems related with returning the oil in the refrigeration cycle back to the compressor stems from the operating principle of the refrigeration cycle. Particularly in cooling systems utilizing a parallel evaporator, some of the cooling compartments are not activated for a considerably long period of time, while some are activated once in a while, the compressor being operated at low revolutions in case the refrigeration load is relatively small. In cooling compartments which are not activated for longer period of time or activated for a relatively shorter period of time and/or in such cases where the refrigerant fluid could not attain an adequate sweep rate as a result of the compressor being operated at lower revolutions, the oil passing together with refrigerant fluid accumulates inside the refrigeration cycle, especially in evaporator bending forms and return line. [5] As the amount of the oil leaked to the refrigeration cycle increases, the oil inside the compressor decreases, resulting a decrease of compressor performance.
[6] Several methods are developed in order to regain the oil leaked into the refrigeration cycle to the compressor.
[7] In the current state of the art, in Japanese Patent Applications JP 51121843 and JP
63198788, a description is given of an embodiment wherein the oil accumulated in the refrigeration cycle is returned back to the compressor by operating the compressor at a higher capacity, said compressor having been operated at a lower capacity for a certain period of time.
[8] Another document in the current state of the art is the Japanese Patent Application
JP2004-308925 wherein a description is given of an embodiment developed to regain the oil back to the compressor by changing the operation speed of the compressor according to the flow rate of the fluid in refrigeration cycle.
[9] Another document in the current state of the art is the United States Patent
Document US 6675595 wherein a description is given of an embodiment developed to return the oil back to the compressor by operating the compressor for separated time intervals for a certain period of time just after the instant where the flow rate of the fluid in the refrigeration cycle drops below a certain level.
[10] The aim of the present invention is the realization of a cooling device wherein means are provided to effectively regain the oil accumulated inside the refrigeration cycle to the compressor.
[11] In the cooling device designed to fulfill the objectives of the present invention and described in the first claim and the other claims related with this claim, an oil return procedure is performed wherein the compressor is operated at a higher revolution by opening one or more than one valve, in case the compressor has been operated below a certain revolution and the specified time where a valve is to stay open decreases below a certain value or closed increases above a certain value, said valve being utilized to permit the refrigerant fluid flow to an evaporator comprised by any of the cooling compartments. Thereby, it is accomplished that, by means of the force applied by the refrigerant fluid having a certain sweep rate attained as a consequence of the compressor being operated at a predetermined high revolution, the oil accumulated inside the refrigeration cycle because of inadequate sweep rate is mixed with the refrigerant fluid and transferred back to the compressor.
[12] Furthermore, it is also achieved that oil is regained to the compressor as the possibility of oil accumulation in the refrigeration cycle is eliminated by performing oil return procedure in such cases as the specified time where the valve is to stay open decreases below a certain value or closed increases above a certain value, where the possibility of oil accumulation inside the refrigeration cycle is high. [13] By means of the present invention, it is accomplished that the life span of the compressor is increased and that the refrigeration cycle is performed in a more effective manner as oil accumulated in the refrigeration cycle is regained to the compressor by performing oil return procedure. Moreover, prevented is the effect of the oil accumulated inside the refrigeration cycle, particularly inside the evaporators, reducing the heat transfer between the refrigerant fluid and the external medium.
[14] The cooling device designed to fulfill the objectives of the present invention is illustrated on the attached figures where:
[15] Fig.l - is a schematic view of a cooling device.
[16] Elements shown on figures are numbered as follows:
[17] 1. Cooling device
[18] 2. Compartment
[19] 3. Control unit
[20] 4. Compressor
[21] 5. Condenser
[22] 6. Evaporator
[23] 7. Valve
[24] The cooling device (1) in accordance with the present invention comprises a compressor (4) used to pressurize the refrigerant fluid, a condenser (5) whereby the refrigerant fluid leaving the compressor (4) in superheated vapor phase is first condensed and transformed to liquid - vapor phase and then to completely liquid phase, one or more than one compartment (2) where items to be cooled are placed into and which incorporates one or more than one evaporator (6) whereby its environment is cooled as heat is absorbed by the refrigerant fluid circulating there inside, one or more than one valve (7) positioned between the condenser (5) and the evaporator (6), controlling the transfer of the refrigerant fluid to the evaporator (6) and, a control unit (3) used to control the open and closed time periods of each valve (Figure 1).
[25] When the compressor (4) is operated below a certain revolution and the specified time where one or more than one valve (7) is to stay open decreases below a certain period of time or
[26] - when the specified time where one or more than one valve (7) is to stay closed increases above a certain period of time,
[27] in order to improve the circulating of the oil accumulated inside the refrigeration cycle, the control unit (3) realizes the oil return procedure wherein one or more than one valve (7) is opened and the compressor (4) is started to operate at a predetermined revolution for a predetermined period of time.
[28] By performing the oil return procedure, it is achieved that, by means of the force applied by the refrigerant fluid having a certain desired sweep rate attained as a consequence of the compressor (4) being operated at a predetermined high revolution, the oil accumulated inside the refrigeration cycle because of inadequate sweep rate, is mixed with the refrigerant fluid and transferred back to the compressor (4).
[29] In the preferred embodiment of the present invention, a variable speed compressor
(4) is preferably utilized, said compressor (4) being used to circulate the refrigerant fluid in the refrigeration cycle by operating at four different revolutions such as 1700, 2500, 3200, 4000 rpm. The temperatures of each compartment (2) is checked by the control unit (3) and according to a predetermined order, refrigeration process is performed by varying the revolution of the compressor (4) depending on the situation of each compartment where their temperature is above or below a certain temperature value. Unless the refrigeration process applied for one compartment (2) is completed, it is not possible to continue with a refrigeration process defined for other compartments (2).
[30] In the cooling device (1) in accordance with present invention, it is checked whether the compressor (4) is operated below a certain revolution or not. If the compressor (4) is not operated below said certain revolution, regular operation steps are performed. If the compressor (4) is operated below this certain value, the specified time of each valve to stay open or closed is observed. If any of the valves (7) stayed closed for a longer period of time than the one predetermined by the manufacturer or if any of the valves (7) stayed open for a shorter period of time than the one predetermined by the manufacturer, oil return procedure is performed. If any of the aforementioned conditions is not satisfied, regular operation steps are performed.
[31] In another embodiment of the present invention, if the compressor (4) is operated below a certain revolution and the specified time of any of the valves (7) to stay open drops below a certain period of time, by means of the control unit (3) oil return procedure is performed by opening only the valve (7) meeting the condition. In that case, since the other compartments (2) do not satisfy the requirements, energy is saved. Furthermore, the afore-described procedure allows that oil return procedure is applied to the compartment (2) where the procedure is necessary, in its regular turn such that the continuity of refrigeration process in a predetermined order for the compartments (2) is not broken. For instance, if the compressor (4) is operated below 2500 rpm and the specified time of any of the valves (7) to stay open is less than two minutes, oil return procedure is performed by opening the mentioned valve (7) only.
[32] In another embodiment of the present invention, if the compressor (4) is operated below a certain revolution and the specified time of any of the valves (7) to stay open drops below a certain period of time, by means of the control unit (3) oil return procedure is performed by opening every valve (7) in a predetermined order.
[33] In another embodiment of the present invention, if the compressor (4) is operated below a certain revolution and the total of the specified times of every valve (7) to stay open drops below a certain period of time, by means of the control unit (3) oil return procedure is performed by opening every valve (7) in a predetermined order.
[34] In another embodiment of the present invention, if the compressor (4) is operated below a certain revolution and the specified time of any of the valves (7) to stay closed exceeds a certain period of time, by means of the control unit (3) oil return procedure is performed by opening only the valve (7) satisfying the condition.
[35] In another embodiment of the present invention, a minimum compressor (4) revolution interval is defined for each compartment (2). Oil return procedure is performed if the compressor (4) is operated below the mentioned interval.
[36] By means of the present invention, it is accomplished that the life span of the compressor is increased and that the refrigeration cycle is performed in a more effective manner as oil accumulated in the refrigeration cycle is regained to the compressor by performing the oil return procedure. Moreover, prevented is the effect of the oil accumulated inside the refrigeration cycle, particularly inside the evaporators, reducing the heat transfer.

Claims

Claims
[1] A cooling device (1) comprising
- a compressor (4) used to pressurize the refrigerant fluid,
- a condenser (5) whereby the refrigerant fluid leaving the compressor (4) in superheated vapor phase is first condensed and transformed to liquid - vapor phase and then to completely liquid phase,
- one or more than one compartment (2) where items to be cooled are placed into and which incorporates one or more than one evaporator (6) whereby its environment is cooled as heat is absorbed by the refrigerant fluid circulating there inside,
- one or more than one valve (7) positioned between the condenser (5) and the evaporator (6), controlling the transfer of the refrigerant fluid to the evaporator (6) and, characterized by a control unit (3) which
- realizes an oil return procedure in order to improve the circulation of the oil accumulated inside the refrigeration cycle, wherein one or more than one valve (7) is opened and the compressor (4) is started to operate at a predetermined revolution for a predetermined period of time,
- when the compressor (4) is operated below a certain revolution and the specified time where one or more than one valve (7) is to stay open decreases below a certain period of time or
- when the specified time where one or more than one valve (7) is to stay closed increases above a certain period of time.
[2] A cooling device (1) as described in Claim 1, characterized by a control unit (3) which realizes the oil return procedure when the compressor (4) is operated below a certain revolution and the specified time of one more than one valve (7) to stay open drops below a certain period of time.
[3] A cooling device (1) as described in Claims 1 or 2, characterized by a control unit (3) which realizes the oil return procedure when the compressor (4) is operated below a certain revolution and the specified time of one more than one valve (7) to stay closed exceeds a certain period of time.
[4] A cooling device (1) as described in Claims 1 or 2, characterized by a control unit (3) which realizes the oil return procedure when the specified time of any of the valves (7) to stay open drops below a certain period of time by opening only the valve (7) satisfying the condition.
[5] A cooling device (1) as described in Claims 1 or 2, characterized by a control unit (3) which realizes the oil return procedure when the specified time of any of the valves (7) to stay open drops below a certain period of time by opening every valve (7) in a predetermined order. [6] A cooling device (1) as described in Claims 1 or 2, characterized by a control unit (3) which realizes the oil return procedure when the total specified time of every valves (7) to stay open drops below a certain period of time by opening every valve (7) in a predetermined order. [7] A cooling device (1) as described in Claims 1 or 3, characterized by a control unit (3) which realizes the oil return procedure when the specified time of any of the valves (7) to stay closed exceeds a certain period of time by opening only the valve (7) satisfying the condition. [8] A cooling device (1) as described in any of the above Claims, characterized by a control unit (3) which realizes the oil return procedure when the compressor (4) is operated below the minimum compressor (4) revolution defined for each compartment (2).
EP06795916A 2005-09-05 2006-09-05 A cooling device Withdrawn EP1922516A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200503548 2005-09-05
PCT/IB2006/053120 WO2007029180A2 (en) 2005-09-05 2006-09-05 A cooling device

Publications (1)

Publication Number Publication Date
EP1922516A2 true EP1922516A2 (en) 2008-05-21

Family

ID=37836221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06795916A Withdrawn EP1922516A2 (en) 2005-09-05 2006-09-05 A cooling device

Country Status (2)

Country Link
EP (1) EP1922516A2 (en)
WO (1) WO2007029180A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8387406B2 (en) * 2008-09-12 2013-03-05 GM Global Technology Operations LLC Refrigerant system oil accumulation removal
JP6459800B2 (en) * 2015-06-26 2019-01-30 株式会社富士通ゼネラル Air conditioner
JP6458666B2 (en) * 2015-06-30 2019-01-30 株式会社富士通ゼネラル Air conditioner
CN108351131A (en) * 2015-09-24 2018-07-31 开利公司 Control the system and method that the oil stream in refrigeration system is moved
CN108489150B (en) 2018-02-02 2020-06-16 青岛海尔空调电子有限公司 Multi-split oil return control method and system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215866B (en) * 1988-02-09 1992-06-24 Toshiba Kk Multi-type air conditioner system with oil level control for parallel operated compressor therein
JPH0213760A (en) * 1988-06-30 1990-01-18 Toshiba Corp Controller for multiple air-conditioning system
JPH05157380A (en) * 1991-12-10 1993-06-22 Toshiba Ave Corp Air conditioner
JP3418287B2 (en) * 1995-12-20 2003-06-16 東芝キヤリア株式会社 Oil recovery control device for multi-type air conditioner
JPH1047800A (en) * 1996-08-02 1998-02-20 Matsushita Refrig Co Ltd Clooer
JP3732907B2 (en) * 1996-12-12 2006-01-11 三洋電機株式会社 Air conditioner and refrigeration oil recovery method thereof
JP4378176B2 (en) * 2002-04-08 2009-12-02 ダイキン工業株式会社 Refrigeration equipment
JP4063023B2 (en) * 2002-09-12 2008-03-19 株式会社デンソー Vapor compression refrigerator
JP4100135B2 (en) * 2002-11-07 2008-06-11 三菱電機株式会社 Refrigeration cycle apparatus and control method for refrigeration cycle apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007029180A2 *

Also Published As

Publication number Publication date
WO2007029180A2 (en) 2007-03-15
WO2007029180A3 (en) 2007-10-18

Similar Documents

Publication Publication Date Title
EP3568049B1 (en) Control, diagnostics, and architecture for micro booster supermarket refrigeration architecture
CN103250012B (en) binary refrigeration cycle device
RU2480684C2 (en) Method and device for defrosting with hot steam
JP5613122B2 (en) Method for controlling refrigerant pressure and flow
RU2672995C1 (en) System and method of autonomous and uninterrupted defrosting
JP5287831B2 (en) Two-stage boost refrigeration cycle
CN103562656A (en) Refrigeration-cycle device
WO2012086089A1 (en) Method and device for controlling operation of heat pump device
EP3712541B1 (en) Heat pump system
EP1922516A2 (en) A cooling device
KR20050037731A (en) Apparatus and method for liquid refrigerant temperature preventing accumulation of air conditioner
EP2013552A2 (en) Flow rate control system in refrigeration circuits, method for controlling a refrigeration system and a refrigeration system
US10119734B2 (en) Cooling device with compressor cabinet heater and a control method
JP2011017455A (en) Turbo refrigerator
JP2009236428A (en) Compression type refrigerating machine
JP6498299B2 (en) Refrigeration cycle equipment
WO2006018746A1 (en) A cooling device
JP2008128570A (en) Refrigerating apparatus
CN100578114C (en) Freezing device
JP2018096632A (en) Refrigerant circuit system, control device and control method
JP2018173194A (en) Refrigerator
JP3010908B2 (en) Refrigeration equipment
KR20070107858A (en) Refrigerator
KR100531325B1 (en) Refrigerating cycle in direct cooling type refrigerator and method thereof
JP2013213590A (en) Rising control method of binary refrigeration apparatus

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

17P Request for examination filed

Effective date: 20080312

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20160401