EP1966549B1 - A cooling device - Google Patents

A cooling device Download PDF

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Publication number
EP1966549B1
EP1966549B1 EP06841405.1A EP06841405A EP1966549B1 EP 1966549 B1 EP1966549 B1 EP 1966549B1 EP 06841405 A EP06841405 A EP 06841405A EP 1966549 B1 EP1966549 B1 EP 1966549B1
Authority
EP
European Patent Office
Prior art keywords
evaporator
refrigerant
valve
compressor
expansion element
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.)
Not-in-force
Application number
EP06841405.1A
Other languages
German (de)
French (fr)
Other versions
EP1966549A1 (en
Inventor
Serdar Kocaturk
Sabahattin Hocaoglu
Yalcin Guldali
Burak Asureciler
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
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Publication date
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Publication of EP1966549A1 publication Critical patent/EP1966549A1/en
Application granted granted Critical
Publication of EP1966549B1 publication Critical patent/EP1966549B1/en
Not-in-force legal-status Critical Current
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00Problems to be solved
    • F25B2500/26Problems to be solved characterised by the startup of the refrigeration cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00Problems to be solved
    • F25B2500/27Problems to be solved characterised by the stop of the refrigeration cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/02Compressor control
    • F25B2600/025Compressor control by controlling speed
    • F25B2600/0251Compressor control by controlling speed with on-off operation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/23Time delays
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2511Evaporator distribution valves

Definitions

  • the present invention relates to a cooling device wherein the refrigerant migration is directed.
  • refrigerant passage occurs from the condenser to the evaporator until the suction line and the discharge line pressures are balanced.
  • This condition called refrigerant migration, results in the overheating of the ambient temperature regionally in the cabin inner portions corresponding to the first evaporator passages wherein particularly the evaporator inlet is situated.
  • the temperature in this region and hence the thermal load of the cooling cabin increases due to the refrigerant migration effect.
  • This condition brings an additional thermal load inside the cooling cabin and also prevents a homogeneous distribution of temperature in the cooled cabin and results in the increase of energy consumption with the compressor operating for a longer time.
  • the evaporator stays dry since it is not filled up with the refrigerant.
  • a certain time period passes for the refrigerant to fill up the evaporator and fall to the evaporation temperature along the entire evaporator.
  • This process called the redistribution of charge in the evaporator (the evaporator filling up with the refrigerant), results in the decrease of the evaporator efficiency and lowering of its cooling capacity during this time period.
  • Even if prevention of the refrigerant migration provides a reduction in energy consumption to a certain extent, the evaporator refilling up with the refrigerant takes a longer time since the evaporator stays entirely dry during the off period.
  • the object of the present invention is the realization of a cooling device wherein the evaporator is provided to be refilled with the refrigerant at the start of the next compressor on period while the refrigerant migration effect is reduced.
  • the cooling device realized in order to fulfill the objectives of the present invention, explicated in the first claim and the dependent claims thereof, comprises preferably a bi-solenoid valve, situated between the condenser and the expansion element, that prevents refrigerant flow from the condenser to the evaporator by means of the capillary tube that is used as an expansion element during the off-period of the compressor by staying closed and another expansion element, one end of which is connected to this valve and the other end to the evaporator passages between the evaporator inlet and outlet, preferably to a passage near the last passage and a valve between the point wherein this expansion element is connected to the evaporator and the first passages of the evaporator.
  • a bi-solenoid valve situated between the condenser and the expansion element, that prevents refrigerant flow from the condenser to the evaporator by means of the capillary tube that is used as an expansion element during the off-period of the compressor by staying closed and another expansion element, one
  • the valve situated between the evaporator passages stays open during the on-period of the compressor providing the refrigerant to flow along the evaporator, and is kept in the closed position during the off period of the compressor, preventing the refrigerant that reaches the evaporator by means of the additional expansion element due to refrigerant migration from reaching the first passages of the evaporator and provides the refrigerant to be directed only to the last passages of the evaporator.
  • the refrigerant flowing due to the refrigerant migration effect by means of the capillary tube from the condenser to the evaporator during the off period of the compressor is directed to the last passages of the evaporator with the additional expansion element and the heating effect resulting from the refrigerant migration is decreased.
  • the directing of the refrigerant migration instead of completely preventing it also assists in enhancing the redistribution process of the refrigerant at the same time.
  • the valve between the evaporator passages is opened by the control unit before the compressor starts its on period and the refrigerant is provided to be distributed in the entire evaporator before the compressor starts its on period. Accordingly pressure is balanced in all of the evaporator passages by opening the valve a short while before the compressor on period starts.
  • the valve is switched to the open position by the control unit, delaying to change the position of the other valve at the start of the compressor on period and the refrigerant is delivered to the evaporator over the additional expansion element for a certain time period. Accordingly, the process of the refrigerant refilling the evaporator is enhanced by continuing the refrigerant flow over the additional expansion element for a certain time period
  • the cooling device (1) of the present invention comprises a compressor (2) that provides compression of the refrigerant, a condenser (3) providing the refrigerant leaving the compressor (2) as overheated vapor to be condensed to change first to the liquid-vapor phase and then to the liquid phase completely, one or more evaporators (5) providing to cool the ambient environment by the refrigerant circulating within absorbing heat, an expansion element (4) providing the refrigerant leaving the condenser (3) to expand and to be delivered to the evaporator (5), preferably a bi-stable solenoid valve (6) situated between the condenser (3) and the expansion element (4) that shuts off the refrigerant flow from the condenser (3) to the evaporator (5) during the off period of the compressor (2) ( Figure 1 ).
  • the cooling device (1) comprises an additional expansion element (7) with one end extending to the valve (6) and the other end into between the evaporator (5) passages, providing to direct the refrigerant migration to a portion of the evaporator (5), a second valve (16) separating the evaporator (5) into two by being situated between the evaporator (5) inlet and the point wherein the additional expansion element (7) is connected to the evaporator (5), and a control unit (8) that provides the refrigerant to reach from the condenser (3) to the evaporator (5) and to the compressor (2) by means of the first valve (6) and by way of the expansion element (4) thus completing the cooling cycle by opening the second valve (16) while the compressor (2) operates and when the compressor (2) stops, closing the second valve (16) providing the refrigerant that tends to flow from the condenser (3) to the evaporator (5) by the first valve (6) due to the refrigerant migration effect, to be directed over the additional expansion element (7) to the passages of the
  • the additional expansion element (7) is selected to be with a lesser resistance than the expansion element (4), that is of a greater diameter, with a shorter length in order to cause a smaller pressure decrease of the refrigerant.
  • the valve (6) is a bi-stable solenoid valve with one inlet port- two outlet ports, the inlet port extending to the condenser (3), one of the outlet ports extending to the expansion element (6), and the other to the additional expansion element (7).
  • the control unit (8) regulates the valves (6,16) with a control method in the following way: During the on period of the compressor (2), the port of the valve (6) between the expansion element (4) and the condenser (3) extending to the expansion element (4) is open, the port extending to the additional expansion element (7) is closed and the refrigerant is allowed to reach the expansion element (4) but not to the additional expansion element (7). In this case the second valve (16) is in the open position. The refrigerant reaching the condenser (3) by flowing from the discharge line, passes from the condenser (3) to the evaporator (5) by way of the expansion element (4) and reaches the compressor (2) again from the suction line.
  • the refrigerant that tends to flow from the condenser (3) to the evaporator (5) due to the refrigerant migration effect reaches the evaporator (5) over the additional expansion element (7) because the port of the valve (6) extending to the expansion element (4) is closed, and the passages of the evaporator (5) between the valve (16) situated at the point wherein the additional expansion element (7) is connected to the evaporator (5) and the compressor (2) are filled up with the refrigerant until the pressure between the suction and discharge lines is balanced.
  • the pressure between the compressor (2) suction and discharge lines is balanced, the effect of the refrigerant migration is entirely over.
  • the valves (6 and 16) are changed to their initial positions, directing the refrigerant flow leaving the condenser (3) to the expansion element (4).
  • the valve (16) between the evaporator (5) passages is opened before the compressor (2) starts its on period, and the distribution of the refrigerant to the entire evaporator (5) is provided before the compressor (2) starts its on period.
  • the valve (16) is opened a short while before the on period starts, providing to balance the pressure between all of the evaporator (5) passages. With the start of the on period, the position of the valve (16) is changed and the refrigerant leaving the condenser (3) is directed to the expansion element (4).
  • valve (16) is changed to the open position by the control unit (8), delaying the change of position of the valve (6) at the start of the compressor (2) on period and the refrigerant is delivered to the evaporator (5) over the additional expansion element (7) for a certain time period.
  • the process of the evaporator (5) filling up with the refrigerant is enhanced by continuing the refrigerant flow over the additional expansion element (7) for a certain time period. Since the additional expansion element (7) with a lower resistance functions in the first moments of the compressor (2) on period, all of the evaporator (5) passages up to the evaporator (5) outlet can be wetted in a short while. After this time period the refrigerant flow is again directed over the expansion element (4) by opening the valve (6).
  • refrigerant migration is not prevented altogether; instead, it is directed to a portion of the evaporator (5).
  • a more homogeneous distribution of temperature within the cabin is provided by decreasing the heating effect of the refrigerant migration that occurs during the compressor (2) off period, enhancing the refilling up of the evaporator (5) with refrigerant at the start of the next on period.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)
  • Air-Conditioning For Vehicles (AREA)

Description

  • The present invention relates to a cooling device wherein the refrigerant migration is directed.
  • If no precautions are taken during the off cycle of the compressor in particularly the cooling devices (refrigerator, deep freezer, air conditioner etc.) having a cyclical cooling system, refrigerant passage occurs from the condenser to the evaporator until the suction line and the discharge line pressures are balanced. This condition, called refrigerant migration, results in the overheating of the ambient temperature regionally in the cabin inner portions corresponding to the first evaporator passages wherein particularly the evaporator inlet is situated. The temperature in this region and hence the thermal load of the cooling cabin increases due to the refrigerant migration effect. This condition brings an additional thermal load inside the cooling cabin and also prevents a homogeneous distribution of temperature in the cooled cabin and results in the increase of energy consumption with the compressor operating for a longer time.
  • Various embodiments developed to minimize the effect of the refrigerant migration are explained in various state-of-the-art documents.
  • One of these documents is the European Patent Application no. EP0692687 . In this application, the prevention of refrigerant migration by using a solenoid valve situated at the inlet of the capillary tube that is regulated by a control unit is explained.
  • Another state-of-the-art document is the International Patent Application no. WO2005088212 . In this application, the description is given for the prevention of refrigerant migration and also the elimination of the compressor start-up problem. Other possible solutions are discussed in patent documents DE19535144 , JP2000329443 , EP0246465 and EP0990862 .
  • In implementations wherein refrigerant migration is prevented, the evaporator stays dry since it is not filled up with the refrigerant. At the start of the compressor on period, a certain time period passes for the refrigerant to fill up the evaporator and fall to the evaporation temperature along the entire evaporator. This process, called the redistribution of charge in the evaporator (the evaporator filling up with the refrigerant), results in the decrease of the evaporator efficiency and lowering of its cooling capacity during this time period. Even if prevention of the refrigerant migration provides a reduction in energy consumption to a certain extent, the evaporator refilling up with the refrigerant takes a longer time since the evaporator stays entirely dry during the off period.
  • The object of the present invention is the realization of a cooling device wherein the evaporator is provided to be refilled with the refrigerant at the start of the next compressor on period while the refrigerant migration effect is reduced.
  • The cooling device realized in order to fulfill the objectives of the present invention, explicated in the first claim and the dependent claims thereof, comprises preferably a bi-solenoid valve, situated between the condenser and the expansion element, that prevents refrigerant flow from the condenser to the evaporator by means of the capillary tube that is used as an expansion element during the off-period of the compressor by staying closed and another expansion element, one end of which is connected to this valve and the other end to the evaporator passages between the evaporator inlet and outlet, preferably to a passage near the last passage and a valve between the point wherein this expansion element is connected to the evaporator and the first passages of the evaporator.
  • The valve situated between the evaporator passages stays open during the on-period of the compressor providing the refrigerant to flow along the evaporator, and is kept in the closed position during the off period of the compressor, preventing the refrigerant that reaches the evaporator by means of the additional expansion element due to refrigerant migration from reaching the first passages of the evaporator and provides the refrigerant to be directed only to the last passages of the evaporator.
  • Accordingly, the refrigerant flowing due to the refrigerant migration effect by means of the capillary tube from the condenser to the evaporator during the off period of the compressor, is directed to the last passages of the evaporator with the additional expansion element and the heating effect resulting from the refrigerant migration is decreased. In order to decrease the effect of refrigerant migration, the directing of the refrigerant migration instead of completely preventing it, also assists in enhancing the redistribution process of the refrigerant at the same time.
  • In another embodiment of the present invention, the valve between the evaporator passages is opened by the control unit before the compressor starts its on period and the refrigerant is provided to be distributed in the entire evaporator before the compressor starts its on period. Accordingly pressure is balanced in all of the evaporator passages by opening the valve a short while before the compressor on period starts.
  • In yet another embodiment of the present invention, the valve is switched to the open position by the control unit, delaying to change the position of the other valve at the start of the compressor on period and the refrigerant is delivered to the evaporator over the additional expansion element for a certain time period. Accordingly, the process of the refrigerant refilling the evaporator is enhanced by continuing the refrigerant flow over the additional expansion element for a certain time period
  • By means of the present invention, in a cooling system operating with an on/off cycle, by decreasing the heating effect of the refrigerant migration that occurs during the off period of the compressor, a more homogeneous distribution of temperature inside the cabin is provided, and at the start of the next on period, enhancement of the refilling of refrigerant into the evaporator is provided as compared to implementations wherein refrigerant migration is completely prevented.
  • The cooling device realized in order to fulfill the objectives of the present invention is illustrated in the attached figures, where:
    • Figure 1 - is the general view of the cooling device.
    • Figure 2 - is the schematic view of an embodiment of the cooling system of the cooling device of the present invention.
  • The elements shown in figures are numbered as follows:
    1. 1. Cooling device
    2. 2. Compressor
    3. 3. Condenser
    4. 4. Expansion element
    5. 5. Evaporator
    6. 6. , 16. Valve
    7. 7. Additional expansion element
    8. 8. Control unit
  • The cooling device (1) of the present invention comprises a compressor (2) that provides compression of the refrigerant, a condenser (3) providing the refrigerant leaving the compressor (2) as overheated vapor to be condensed to change first to the liquid-vapor phase and then to the liquid phase completely, one or more evaporators (5) providing to cool the ambient environment by the refrigerant circulating within absorbing heat, an expansion element (4) providing the refrigerant leaving the condenser (3) to expand and to be delivered to the evaporator (5), preferably a bi-stable solenoid valve (6) situated between the condenser (3) and the expansion element (4) that shuts off the refrigerant flow from the condenser (3) to the evaporator (5) during the off period of the compressor (2) (Figure 1).
  • The cooling device (1) comprises an additional expansion element (7) with one end extending to the valve (6) and the other end into between the evaporator (5) passages, providing to direct the refrigerant migration to a portion of the evaporator (5), a second valve (16) separating the evaporator (5) into two by being situated between the evaporator (5) inlet and the point wherein the additional expansion element (7) is connected to the evaporator (5), and a control unit (8) that provides the refrigerant to reach from the condenser (3) to the evaporator (5) and to the compressor (2) by means of the first valve (6) and by way of the expansion element (4) thus completing the cooling cycle by opening the second valve (16) while the compressor (2) operates and when the compressor (2) stops, closing the second valve (16) providing the refrigerant that tends to flow from the condenser (3) to the evaporator (5) by the first valve (6) due to the refrigerant migration effect, to be directed over the additional expansion element (7) to the passages of the evaporator (5) situated after the second valve (16) and to by-pass the evaporator (5) passages between the two valves (16 and 6) (Figure 2).
  • The additional expansion element (7) is selected to be with a lesser resistance than the expansion element (4), that is of a greater diameter, with a shorter length in order to cause a smaller pressure decrease of the refrigerant.
  • The valve (6) is a bi-stable solenoid valve with one inlet port- two outlet ports, the inlet port extending to the condenser (3), one of the outlet ports extending to the expansion element (6), and the other to the additional expansion element (7).
  • In this embodiment of the present invention, the control unit (8) regulates the valves (6,16) with a control method in the following way: During the on period of the compressor (2), the port of the valve (6) between the expansion element (4) and the condenser (3) extending to the expansion element (4) is open, the port extending to the additional expansion element (7) is closed and the refrigerant is allowed to reach the expansion element (4) but not to the additional expansion element (7). In this case the second valve (16) is in the open position. The refrigerant reaching the condenser (3) by flowing from the discharge line, passes from the condenser (3) to the evaporator (5) by way of the expansion element (4) and reaches the compressor (2) again from the suction line. When the compressor (2) stops, the position of the valve (6) is changed by the control unit (8) and its port extending to the expansion element (4) is closed, the port extending to the additional expansion element (7) is opened. Simultaneously, the other valve (16) is changed to the closed position by the control unit (8). In this case the refrigerant that tends to flow from the condenser (3) to the evaporator (5) due to the refrigerant migration effect, reaches the evaporator (5) over the additional expansion element (7) because the port of the valve (6) extending to the expansion element (4) is closed, and the passages of the evaporator (5) between the valve (16) situated at the point wherein the additional expansion element (7) is connected to the evaporator (5) and the compressor (2) are filled up with the refrigerant until the pressure between the suction and discharge lines is balanced. When the pressure between the compressor (2) suction and discharge lines is balanced, the effect of the refrigerant migration is entirely over. As the on period of the compressor (2) starts, the valves (6 and 16) are changed to their initial positions, directing the refrigerant flow leaving the condenser (3) to the expansion element (4).
  • In the control method implemented by the control unit (8) in another embodiment of the present invention, the valve (16) between the evaporator (5) passages is opened before the compressor (2) starts its on period, and the distribution of the refrigerant to the entire evaporator (5) is provided before the compressor (2) starts its on period. In this embodiment, since the refrigerant migration loses its heating effect after the first moments of the compressor (2) off period, the valve (16) is opened a short while before the on period starts, providing to balance the pressure between all of the evaporator (5) passages. With the start of the on period, the position of the valve (16) is changed and the refrigerant leaving the condenser (3) is directed to the expansion element (4). Directing the refrigerant to the passages of the evaporator (5) between the valve (16) and the compressor (2) without preventing refrigerant migration, prevents the increase of temperature differences in the cooling cabin that results in a homogeneous distribution of temperature within the cabin. Furthermore, the redistribution of the refrigerant is enhanced as compared to the case when refrigerant migration is prevented.
  • In another embodiment of the present invention, the valve (16) is changed to the open position by the control unit (8), delaying the change of position of the valve (6) at the start of the compressor (2) on period and the refrigerant is delivered to the evaporator (5) over the additional expansion element (7) for a certain time period.
  • In this embodiment, the process of the evaporator (5) filling up with the refrigerant is enhanced by continuing the refrigerant flow over the additional expansion element (7) for a certain time period. Since the additional expansion element (7) with a lower resistance functions in the first moments of the compressor (2) on period, all of the evaporator (5) passages up to the evaporator (5) outlet can be wetted in a short while. After this time period the refrigerant flow is again directed over the expansion element (4) by opening the valve (6).
  • By way of the present invention, refrigerant migration is not prevented altogether; instead, it is directed to a portion of the evaporator (5). In an on /off operating cooling system, a more homogeneous distribution of temperature within the cabin is provided by decreasing the heating effect of the refrigerant migration that occurs during the compressor (2) off period, enhancing the refilling up of the evaporator (5) with refrigerant at the start of the next on period.

Claims (4)

  1. A cooling device (1) comprising a compressor (2) that provides compression of a refrigerant, a condenser (3) providing the refrigerant leaving the compressor (2) as overheated vapor to be condensed to pass first to the liquid-vapor phase and then to the liquid phase completely, one or more evaporators (5) comprising passages and providing to cool an ambient environment with the absorption of heat by the refrigerant circulating within, an expansion element (4) providing the refrigerant leaving the condenser (3) to expand and to be delivered to the evaporator (5), a valve (6) situated between the condenser (3) and the expansion element (4) that shuts off refrigerant flow through the expansion element (4) from the condenser (3) towards the evaporator (5) during the off period of the compressor (2), characterized by an additional expansion element (7) with one end extending to the valve (6) and the other end in between the evaporator passages, providing to direct the refrigerant migration to a portion of the evaporator (5), a second valve (16) separating the evaporator (5) into two by being situated between the evaporator inlet and the point wherein the additional expansion element (7) is connected to the evaporator (5), and a control unit (8)
    • that provides the refrigerant to reach from the condenser (3) to the evaporator (5) and to the compressor (2) by means of the first valve (6) and by way of the expansion element (4) thus completing the cooling cycle by opening the second valve (16) while the compressor (2) operates,
    • that, when the compressor (2) stops, closes the second valve (16) providing the refrigerant that tends to flow from the condenser (3) to the evaporator (5) by the first valve (6) due to refrigerant migration effect, to be directed over the additional expansion element (7) to the passages of the evaporator (5) situated after the second valve (16) and to by-pass the evaporator (5) passages situated between the two valves (16 and 6).
  2. A cooling device (1) as in Claim 1, characterized by the additional expansion element (7) being (7) selected of a greater diameter, with a shorter length than the expansion element (4), such that it will cause a smaller pressure decrease of the refrigerant.
  3. A cooling device (1) as in Claim 1, characterized by the control unit (8) opening the valve (16) between the evaporator (5) passages before the compressor (2) starts its on period, and provides the distribution of the refrigerant to the entire evaporator (5) before the compressor (2) starts its on period.
  4. A cooling device (1) as in Claim 1, characterized by the control unit (8) changing the valve (16) between the evaporator (5) passages to the open position and delays change of position of the valve (6) at the start of the compressor (2) on period and provides the delivery of the refrigerant to the evaporator (5) over the additional expansion element (7) for a certain time period.
EP06841405.1A 2005-12-29 2006-12-18 A cooling device Not-in-force EP1966549B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200505318 2005-12-29
PCT/EP2006/069810 WO2007074094A1 (en) 2005-12-29 2006-12-18 A cooling device

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KR20080081909A (en) 2008-09-10
CN101351677A (en) 2009-01-21
WO2007074094A1 (en) 2007-07-05
EP1966549A1 (en) 2008-09-10
KR101011214B1 (en) 2011-01-26
CN101351677B (en) 2011-09-14

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