US20110113803A1 - Multi-evaporation system - Google Patents

Multi-evaporation system Download PDF

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Publication number
US20110113803A1
US20110113803A1 US13/001,117 US201013001117A US2011113803A1 US 20110113803 A1 US20110113803 A1 US 20110113803A1 US 201013001117 A US201013001117 A US 201013001117A US 2011113803 A1 US2011113803 A1 US 2011113803A1
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United States
Prior art keywords
refrigerant
evaporating
expanding
parts
evaporation system
Prior art date
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Abandoned
Application number
US13/001,117
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English (en)
Inventor
Yong Nam Ahn
Tae Young Park
Eun Gi Min
Deok Soo Kim
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Hanon Systems Corp
Original Assignee
Halla Climate Control Corp
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
Priority claimed from KR1020090119621A external-priority patent/KR101250764B1/ko
Priority claimed from KR1020090119628A external-priority patent/KR101220116B1/ko
Priority claimed from KR1020090119633A external-priority patent/KR101208929B1/ko
Application filed by Halla Climate Control Corp filed Critical Halla Climate Control Corp
Assigned to HALLA CLIMATE CONTROL CORP. reassignment HALLA CLIMATE CONTROL CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AHN, YONG NAM, KIM, DEOK SOO, MIN, EUN GI, PARK, TAE YOUNG
Publication of US20110113803A1 publication Critical patent/US20110113803A1/en
Assigned to HALLA VISTEON CLIMATE CONTROL CORPORATION reassignment HALLA VISTEON CLIMATE CONTROL CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HALLA CLIMATE CONTROL CORPORATION
Assigned to HANON SYSTEMS reassignment HANON SYSTEMS CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HALLA VISTEON CLIMATE CONTROL CORPORATION
Abandoned legal-status Critical Current

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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
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/323—Cooling devices using compression characterised by comprising auxiliary or multiple systems, e.g. plurality of evaporators, or by involving auxiliary cooling devices
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/385—Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0085—Evaporators

Definitions

  • the present invention relates to a multi-evaporation system, and more particularly, to a multi-evaporation system which carries out a multi-evaporation process in an air-conditioning cycle of a vehicle air conditioning system, thereby enhancing system efficiency.
  • the air-conditioning system generally includes an evaporator for absorbing heat from a peripheral portion, a compressor for compressing refrigerant, a condenser for radiating heat to a peripheral portion, and an expansion valve for expanding the refrigerant.
  • the gaseous refrigerant introduced from the evaporator to the compressor is compressed at a high pressure and high temperature, and the compressed gaseous refrigerant radiates liquefaction heat to a peripheral portion while passing through the condenser so as to be liquefied, and the liquefied refrigerant is passed through the expansion valve so as to be in a low pressure low temperature wet vapor state and then introduced again into the evaporator so as to be vaporized.
  • the substantial air conditioning action occurs in the evaporator that absorbs vaporization heat from a peripheral portion while the wet vapor refrigerant is vaporized.
  • the condenser and evaporator in the air-conditioning system typically fall into the category of the heat exchanger. Therefore, the improving of evaporator efficiency is a very important factor in the air-conditioning system.
  • FIG. 1 is a perspective view of a general evaporator.
  • the evaporator 100 includes a pair of header-tanks 110 , a plurality of tubes 120 and a plurality of fins 130 .
  • the header-tank 110 includes a plurality of tube insertion holes 113 that are formed at a lower surface or an upper surface thereof to be extended in a width direction thereof and arranged in a longitudinal direction thereof, an end cap 114 that closes both longitudinal ends thereof, at least one partition wall 111 that partitions an inner space as a refrigerant passage in the longitudinal direction, and at least one baffle 112 that partitions the refrigerant passage in the width direction.
  • both ends of the tube 120 are fixedly inserted into the tube insertion hole 113 of the header-tank 10 so as to form a refrigerant passage, and the fin 130 is interposed between the tubes 120 to enhance heat exchange performance.
  • the type of evaporator shown in FIG. 1 is just an example.
  • the tube 120 may be arranged in two rows (as shown in FIG. 1 ), a single row, or three rows. Further, positions and shapes of the partition wall 111 and the baffle 112 may be changed according to a design of the refrigerant passage, and a communicating hole may be formed in the partition wall 111 . Therefore, the evaporator is not restricted to that of FIG. 1 .
  • FIG. 2 shows evaporation systems constructed by various techniques for improving the efficiency of the conventional evaporator.
  • FIG. 2A shows an evaporation system described in Japanese Patent Publication No. 2000-062452 (hereinafter, prior art 1).
  • two evaporators are arranged in parallel so that refrigerant passed through an expanding means is branched off and then passed through each of the evaporators.
  • one of the evaporators accommodates a cold storage material and functions as a cold storage unit so as to increase cooling efficiency of air passing through the evaporator.
  • FIG. 2B shows an evaporator employing a technique described in Japanese Patent Publication No. 2009-085569 (hereinafter, prior art 2).
  • FIG. 2C shows an evaporator employing another technique described in Japanese Patent Publication No. 2005-308384 (hereinafter, prior art 3).
  • prior art 3 two evaporators are arranged in parallel so that refrigerant passed through an expanding means is passed through, in turn, an evaporator, an ejector, and an evaporator.
  • the evaporation systems described in the prior arts have some problems as followings.
  • one of the two evaporators substantially functions as the cold storage unit, and if the cold storage unit is sufficiently cold-stored, the air is efficiently cooled.
  • the refrigerant passed through the expanding means absorbs from both of the air and the cold storage material, and thus the cooling efficiency of the air is deteriorated.
  • the driving is intermittently performed at the side of the cold storage unit and low temperature refrigerant is stored, it is difficult to control the flow thereof.
  • the prior art 1 functions just as the cold storage unit, the air-conditioning operation is maintained only for a desired time period when an engine is stopped, and thus it is impossible to entirely enhance the cooling performance.
  • the refrigerant is passed through, in turn, the evaporator, the ejector and the evaporator, and it is promoted that the ejector is used to mix the refrigerants having different temperature, thereby improving a temperature condition of the refrigerant and thus increasing the air-conditioning efficiency.
  • the prior art 3 has some problems as follows. In the construction of the prior art 3, since the refrigerant is passed through, in turn, the two evaporators which are arranged in series, there is an advantage in that it is possible to maximize a length of the refrigerant passage in which heat exchange is occurred.
  • An object of the present invention is to provide a multi-evaporation system in which multi-evaporation is occurred by a plurality of evaporators arranged in parallel, thereby enhancing the air-conditioning and system efficiency.
  • Another object of the present invention is to provide a multi-evaporation system which is further provided with an ejector so as to mix the refrigerants and thus improve the temperature condition, thereby enhancing the air-conditioning and system efficiency.
  • the present invention provides a multi-evaporation system including a compressor 10 which sucks and compresses refrigerant; a condenser 20 which condenses the refrigerant compressed in the compressor 10 ; an expanding means 30 which receives the refrigerant condensed in the condenser 20 through an inlet port 31 , branches the refrigerant into at lest two or more, discharges the refrigerant through at least two or more discharging part 32 a to 32 n, and throttles the refrigerant before or after the refrigerant is branched; and an evaporator 40 which comprises at least two or more evaporating parts 41 to 4 N so as to receive and evaporate the refrigerant discharged from the expanding means 30 and then introduce the evaporated refrigerant into the compressor 10 , wherein the evaporating parts 41 to 4 N are parallelly disposed in a flow direction of air passing through the evaporating parts 41 to 4 N so that the air blown by a
  • the refrigerant which is branched and discharged from the discharging parts 32 a to 32 n of the expanding means 30 is supplied to the evaporating parts 41 to 4 N at the same time. Further, a distribution rate of the refrigerant supplied to the evaporating parts 41 to 4 N becomes higher as the evaporating parts 41 to 4 N are disposed at a more upstream side of the flow direction of the air blown from the blower 60 .
  • the evaporating parts 41 to 4 N are formed by dividing the evaporator 40 into at least two or more evaporating regions, or the evaporating parts 41 to 4 N are formed by dividing the evaporator 40 into two evaporating regions, or the evaporating parts 41 to 4 N are formed separately so as to be closely contacted with each other and arranged in parallel.
  • the expanding means 30 comprises an inlet passage 33 which passes the refrigerant introduced from the inlet port 31 ; and at least two or more outlet passages 34 a to 34 n which are formed by dividing the inlet passage 33 into at least two or more so as to discharge the refrigerant to the discharging part 32 a to 32 n.
  • the expanding means 30 comprises an expanding part before branching 35 which is provided at the inlet passage 33 so as to throttle the refrigerant, and an expanding part 35 a to 35 n which is provided at the outlet passage 34 a to 34 n so as to throttle the refrigerant.
  • the expanding part before branching 35 and the expanding part 35 a to 35 n are respectively comprised of one selected from an expansion valve, an orifice, a capillary tube, and a reducing means.
  • the expanding means 30 comprises the expanding part before branching 35 , and the expanding parts provided at the outlet passages except the first outlet passage 34 a which supplies the refrigerant to the first evaporating part 41 disposed at an uppermost stream side of the flow direction of the air blown by the blower 60 .
  • the expanding part before branching 35 is comprised of an expansion valve, and the expanding parts provided at the outlet passages except the first outlet passage 34 a is comprised of one selected from reducing means comprising an orifice and a capillary tube.
  • the expanding means 30 is formed so that a pressure reduction value of the refrigerant supplied to the evaporating part disposed at the downstream of the flow direction of the air blown by the blower 60 is larger than that of the refrigerant supplied to the evaporating part disposed at the upstream of the air flow direction.
  • the expanding means 30 is formed so that a pressure reduction value of the refrigerant supplied to the evaporating part having a relatively small flow rate becomes larger.
  • the expanding means 30 is comprised of expanding parts 35 a to 35 n which are provided at the outlet passages 34 a to 34 n so as to throttle the refrigerant, and the expanding parts 35 a to 35 n are formed so that a pressure reduction level is controlled by adjusting an opening degree thereof. At this time, the expanding means 30 is formed so that a pressure reduction value of the refrigerant supplied to the evaporating part disposed at the downstream of the flow direction of the air blown by the blower 60 is larger than that of the refrigerant supplied to the evaporating part disposed at the upstream of the air flow direction.
  • the multi-evaporation system further includes an ejector which is provided between the evaporator 40 and the compressor 10 so as to suck the refrigerant discharged from a part or whole of the remaining evaporating parts using a flow speed of the refrigerant discharged from a part of the first to Nth evaporating parts 41 to 4 N, raise pressure of the refrigerant and then supply the refrigerant to the compressor 10 .
  • an ejector which is provided between the evaporator 40 and the compressor 10 so as to suck the refrigerant discharged from a part or whole of the remaining evaporating parts using a flow speed of the refrigerant discharged from a part of the first to Nth evaporating parts 41 to 4 N, raise pressure of the refrigerant and then supply the refrigerant to the compressor 10 .
  • the ejector 50 includes a nozzle part 51 which decompresses and expands the refrigerant discharged from a part of the first to Nth evaporating parts 41 to 4 N, and increases a flow speed of the refrigerant; a suction part 52 which sucks the refrigerant discharged from part or whole of the remaining evaporating parts using an increased flow speed of the refrigerant injected from the nozzle part 51 ; and a diffuser part 53 which mixes the refrigerant injected from the nozzle part 51 and the refrigerant sucked through the suction part 52 and then raise pressure of the mixed refrigerant.
  • the ejector 50 is formed so that the refrigerant has a subsonic speed.
  • the multi-evaporation system further includes a detecting means 70 which is provided at passages for connecting the expanding means 30 , the evaporator 40 and the compressor 10 so as to detect temperature and pressure of the refrigerant and control an operation of the expanding means 30 .
  • the refrigerant that is branched in plural while passing through an expanding means is multi-evaporated by the plurality of evaporators arranged in parallel, thereby efficiently evaporating the refrigerant.
  • temperature of the overheated air is lowered while the air passes through each evaporator, and thus the expanding means that is disposed at the front end of each evaporator expands the pressure and temperature of the refrigerant responding to the temperature of the air introduced into each evaporator (high temperature range: an increase in the refrigerant pressure and temperature by a small margin, low temperature range: decrease in the refrigerant pressure and temperature), and thus the control of the evaporation range is precisely carried out, thereby efficiently achieving the evaporation.
  • the length of the refrigerant passage is remarkably reduced comparing with that in the prior art, thereby improving the pressure drop of the refrigerant when the refrigerant is passed through the evaporator.
  • FIG. 10 shows experiment values of comparing a system using a conventional evaporator and a dual evaporation system having a double evaporating range according to the present invention.
  • the refrigerants that is branched in plural and then evaporated in each evaporator are mixed using the ejector, the conditions like the temperature and pressure of the refrigerant which is discharged from the evaporator and then introduced into a compressor is optimized to thereby further improve the system efficiency.
  • the ejector used in the present invention is constructed so that the refrigerant is flowed at a subsonic speed, the refrigerant is efficiently mixed and also noise is not generated.
  • FIG. 1 is a view showing a construction of a general evaporator.
  • FIG. 2 is a view of a conventional evaporation system.
  • FIG. 3 is a view of a multi-evaporation system in accordance with the present invention.
  • FIG. 4 is a view showing an expanding means of the multi-evaporation system in accordance with the present invention.
  • FIG. 5 is a view of the multi-evaporation system having an ejector in accordance with the present invention.
  • FIG. 6 is a view of the ejector in accordance with an embodiment of the present invention.
  • FIG. 7 is a view of the expanding means in accordance with an embodiment of the present invention.
  • FIG. 8 is a view showing a p-h line in a refrigerating cycle device.
  • FIG. 9 is a view showing a pressure drop rate in the refrigerating cycle device.
  • FIG. 10 is a view showing an cooling performance in each of the conventional evaporator and the evaporator of the present invention.
  • compressor 11 condenser 20: expanding means 31: inlet port 32a ⁇ 32n: first to Nth discharging part 33: inlet passage 34a ⁇ 34n: first to Nth outlet passage 35: expanding part before branching 35a ⁇ 35n: first to Nth expanding parts 40: evaporator 41 ⁇ 4N: first to Nth evaporating part 60: blower 70: detecting means
  • FIG. 3 is a view of a multi-evaporation system in accordance with the present invention.
  • the multi-evaporation system of the present invention includes a compressor 10 which sucks and compresses refrigerant; a condenser 20 which condenses the refrigerant compressed in the compressor 10 ; an expanding means 30 which throttles the refrigerant condensed in the condenser 20 ; and an evaporator 40 which evaporates the refrigerant throttled in the expanding means 30 .
  • the refrigerant discharged from the evaporator 40 is flowed again into the compressor 10 such that the refrigerant is circulated.
  • the multi-evaporation system of the present invention has a passage for connecting the expanding means 30 , the evaporator 40 and the compressor 10 , and also further includes a detecting means 70 which detects temperature and pressure of the refrigerant so as to control the expanding means 30 .
  • the multi-evaporation system of the present invention has different features from the general air-conditioning system.
  • the expanding means 30 receives the refrigerant condensed in the condenser 20 through an inlet part 31 , and throttles and then discharges it.
  • the expanding means 30 has refrigerant passages branched into N, and the refrigerant is discharged through first to Nth discharging parts 32 a to 32 n.
  • the refrigerant before or after being branched is throttled in the expanding means 30 (wherein N is an integer equal to or larger than 2).
  • N is an integer equal to or larger than 2.
  • the evaporator 40 functions to receive and evaporate the refrigerant discharged from the expanding means 30 and then introduce it into the compressor 10 .
  • the evaporator 40 includes a first evaporating part 41 for receiving and evaporating the refrigerant discharged from the first discharging part 32 a to an Nth evaporating part 4 N for receiving and evaporating the refrigerant discharged from the Nth discharging part 32 n.
  • the first to Nth evaporating parts 41 to 4 N are arranged in parallel so as to be overlapped in an air flow direction, and thus the air sent by a single blower is passed through in turn the first evaporating part 41 to the Nth evaporating part 4 N so as to be cooled.
  • the refrigerant passage connecting the first discharging part 32 a and the first evaporating 41 and the refrigerant passage connecting the Nth discharging part 32 n and the Nth evaporating part 4 N are also disposed in parallel.
  • the evaporating parts 41 to 4 N receive simultaneously the refrigerant branched and discharged from the discharging parts 32 a to 32 n.
  • the refrigerant branched in the expanding means 30 is not supplied in turn to each evaporating part, but supplied at the same time to the evaporating parts 41 to 4 N.
  • the refrigerant is supplied to all of the N evaporating parts 41 to 4 N so as to exchange heat with the air blown by the blower 60 .
  • the N evaporating parts 41 to 4 N are disposed in parallel, and the air blown by the single blower 60 is passed through in turn the evaporating parts 41 to 4 N.
  • the air that is primarily cooled in the first evaporating part 41 is flowed into the second evaporating part 42
  • the air that is secondly cooled in the second evaporating part 42 is flowed into the third evaporating part 43 , . . . .
  • This process is repeated N times, and thus the air is repeatedly cooled Nthly.
  • the repeated cooling process shows a different aspect from that in the evaporator arranged in two or more rows.
  • the refrigerant is passed through in turn the first and second rows.
  • the refrigerant absorbs heat from the air while passing through the first row, and thus the refrigerant passing through the second row has higher temperature than the refrigerant passing through the first row. Therefore, air cooling performance at the first row is lower than that at the second row.
  • the refrigerant flowed into the evaporating parts 41 to 4 N is previously branched into N from the expanding means 30 , and thus all the refrigerant flowed into each evaporating part 41 to 4 N has the same temperature condition. That is, in case of a conventional evaporator arranged into multiple rows, the temperature of the refrigerant is increased, (because the refrigerant exchanges heat with the air so as to absorb the heat) whenever passing through each row. Thus, as the row number is increased, the air cooling performance is deteriorated (i.e., in the second row than the first row, in the third row than the second row, . . . ).
  • the evaporator 40 of the present invention has excellent air cooling performance comparing with the conventional evaporator.
  • the evaporator 40 is comprised of the evaporating parts 41 to 4 N arranged in parallel, it is possible to further obtain the effects as follows.
  • the refrigerant passage is long. As the refrigerant passage becomes long, the heat exchanging performance and the pressure drop rate are increased. However, if the pressure drop rate is excessively increased, it has a harmful effect on the heat exchanging performance. Therefore, in a study on the form enhancement for improving the cooling performance of the evaporator, it is important to increase the heat exchanging performance and also reduce the pressure drop rate.
  • the evaporating parts 41 to 4 N are disposed in parallel, and the refrigerant flowed into the evaporating parts 41 to 4 N is previously branched in the expanding means 30 into N corresponding to the number of evaporating parts.
  • the refrigerant passage has the same length as that in a single evaporator.
  • the refrigerant passage has a length corresponding to twice of the length of the general evaporator.
  • a length of refrigerant passage becomes longer. That is, the evaporator 40 of the present invention minimizes the length of the refrigerant passage so as to remarkably reduce the pressure drop rate of the refrigerant, thereby maximizing the cooling performance in the evaporator 40 .
  • the distribution rate of the refrigerant is set so that an amount of the refrigerant supplied to the first evaporating part 41 disposed at an uppermost stream side (which is the most adjacent to the blower 60 ) is larger than that supplied to the second evaporating part 42 , and an amount of the refrigerant supplied to the second evaporating part 42 is larger than that supplied to the third evaporating part 43 .
  • the refrigerant is simultaneously supplied to each evaporating part 41 to 4 N, and the temperature conditions of the refrigerants supplied to each evaporating part is the same as each other.
  • a speed of the air becomes slow due to air resistance, and also its temperature is increased due to heat exchange with the refrigerant. That is, the speed of the air passing through the first evaporating part 41 is larger that that of the air passing through the second evaporating part 42 . . . , and the temperature of the air passing through the first evaporating part 41 is smaller that that of the air passing through the second evaporating part 42 . . .
  • the heat exchange performance in the first evaporating part 41 disposed at the uppermost stream side is the highest, and the heat exchange performance in other evaporating parts becomes lower gradually.
  • the distribution rate of the refrigerant is set so that a largest amount of refrigerant is supplied to the first evaporating part 41 , and a next largest amount of refrigerant is supplied to the second evaporating part 42 , . . . , thereby maximizing the heat exchange performance.
  • the distribution rate is reduced.
  • FIG. 8 is a view showing a p-h line in a conventional vehicle air conditioner system having a single evaporator and a vehicle air conditioner system having two evaporating regions according to the present invention.
  • a region # 1 is an evaporation region which is disposed at an upstream side of the air flow generated by the blower 60
  • a region # 2 is an evaporation region which is disposed at a downstream side thereof.
  • the refrigerant is properly distributed and supplied according to inlet air temperature (thermal load) for each region. Since the inlet air temperature of the region # 1 is higher than that of the region # 2 , a refrigerant flow rate of the region # 1 is larger that that of the region # 2 .
  • a refrigerant flow rate passing through each evaporating part is smaller than a total refrigerant flow rate passing through the conventional evaporator, because the refrigerant is simultaneously supplied to the multiple evaporating parts that are parallelly arranged in the air flow direction.
  • a refrigerant pressure loss generated while the refrigerant passes through an inner portion of the evaporator is reduced.
  • the refrigerant pressure loss is reduced when passing through each evaporating part.
  • an inlet pressure of the evaporator is reduced, such that the refrigerant is smoothly expanded and evaporated.
  • the pressure loss is reduced, pressure of the evaporator is remarkably decreased (also the refrigerant temperature is also decreased), and the refrigerant is smoothly evaporated.
  • the inlet refrigerant pressure (temperature) is considerably decreased even in the same sized evaporator, thereby efficiently evaporating the refrigerant.
  • the enthalpy difference is the same, but the total refrigerant flow rate is increased, thereby enhancing a heat radiation performance and thus improving the air conditioner performance.
  • each row is divided by a partition wall, and each row has an inlet port and an outlet port.
  • the evaporating parts 41 to 4 N are disposed to be closely contacted with each other, and the air passing through one evaporating part is flowed to the next evaporating part, thereby maximally preventing heat loss and thus maximizing the air cooling performance.
  • the evaporator 40 embodied as described above has a shape similar to the conventional evaporator, it is possible to use a conventional evaporator manufacturing system without additional initial investment expense.
  • the two rows are completely isolated from each other by using a structure such as baffle and a partition wall so that the refrigerant is not exchanged between the two rows, and inlet and outlet ports are respectively formed at each row, thereby embodying a multi-evaporator of the present invention (in this case, the evaporation performs double evaporation).
  • the evaporator of the present invention may be constructed as follows: the single evaporator is divided by the partition wall so as to form the N evaporating regions, or the evaporating parts 41 to 4 N are separately formed to be closed contacted with each other and arranged in parallel.
  • FIG. 4 is a view showing an expanding means of the multi-evaporation system in accordance with the present invention.
  • the expanding means 30 includes an inlet passage 33 which is connected with an inlet port 31 , N outlet passages which are respectively connected with N outlet ports 32 a to 32 n, and expanding parts 35 , 35 a to 35 n which are provided at each passage.
  • the inlet passage 33 passes the refrigerant introduced from the inlet port 31 , and the first to Nth outlet passages 34 a to 34 n are formed by branching the inlet passage 33 into N.
  • the first to Nth outlet passages 34 a to 34 n are connected with the first to Nth discharging part 32 a to 32 n so as to discharge the refrigerant.
  • the expanding parts 35 , 35 a to 35 n having the passages will be described in detail.
  • the expanding part which is disposed at the inlet passage 33 to throttle the refrigerant is called an expanding part before branching 35
  • the expanding part which is disposed at the first outlet passage 34 a to throttle the refrigerant is called a first expanding part 35 a
  • the expanding part which is disposed at the Nth outlet passage 34 n to throttle the refrigerant is called an Nth expanding part 35 n
  • the expanding means 30 of the present invention includes at least one of the expanding part before branching 35 , and the first to Nth expanding parts 35 a to 35 n.
  • the expanding part before branching 35 may be provided at the inlet passage 33 , or only the Nth expanding part 35 n may be provided at the Nth outlet part 34 n, or the expanding part is not provided at the inlet passage 33 but all the first to Nth expanding parts 35 a to 35 N are respectively provided at the first to Nth outlet passages 34 a to 34 n, and the expanding means 30 may be formed into various types according to design purpose, desired performance and the like.
  • the expanding part before branching 35 and the expanding parts 35 a to 35 n may be comprised of one of an expansion valve, an orifice, a capillary tube, and a reducing means.
  • the expanding means 30 includes the expanding part before branching 35 , and the expanding parts provided at the outlet passages except the first outlet passage 34 a supplying the refrigerant to the first evaporating part 41 which is disposed at the uppermost stream side of the flow direction of the air blown by the blower 60 .
  • the refrigerant distribution rate supplied to each evaporating part is set to be gradually reduced from the first evaporating part 41 toward the Nth evaporating part 4 N, i.e., to be the largest in the first evaporating part 41 and the smallest in the Nth evaporating part 4 N.
  • an amount of the refrigerant passing through the first outlet passage 34 a becomes maximum, and an amount of the refrigerant passing through the Nth outlet passage 34 n becomes minimum.
  • the expanding part before branching 35 is provided so that the refrigerant is throttled while being passed through the expanding part before branching 35 , and also since the expanding parts are provided at the outlet passages, the expanded refrigerant is throttled once more by the expanding parts while being passed through the expanding parts 34 a to 34 n, thereby increasing the evaporation efficiency.
  • the amount of the refrigerant distributed to the first evaporating part 41 becomes the largest, the amount of the refrigerant passing through the first outlet passage 34 a also becomes maximum.
  • the flow rate of the refrigerant passing through the outlet passages 34 b to 34 n except the first outlet passage 34 a is relatively small, bad influence due to the pressure drop is relatively small, and the effect of the increase in the evaporation efficiency due to the pressure reduction is larger than the bad influence.
  • the first outlet passage 34 a if a large amount of the refrigerant passing through the first outlet passage is throttled once more, the refrigerant flow rate is reduced, thereby reducing the efficiency.
  • the expanding part is provided at the rest of the passages (the inlet passage, the second outlet passage, . . . , Nth outlet passage) except the first outlet passage 34 a. Because a relatively small flow rate is flowed in the rest of the passages, the bad influence due to the pressure drop is minimized when the expanding parts are additionally provided, and the effect of the increase in the efficiency is maximized by the pressure reduction due to the throttling of the refrigerant.
  • FIG. 7A shows an embodiment of the expanding means 30 which includes the expanding part before branching 35 and the expanding parts provided at the outlet passages except the first outlet passage 34 a through which the refrigerant is supplied to the first evaporating part 41 disposed at the uppermost stream side of the flow direction of the air blown from the blower 60 .
  • the expanding part before branching 35 is an expansion valve
  • the expanding parts provided at the passages except the first outlet passage 34 a may be comprised of a reducing means such as an orifice, a capillary tube, and a pipe of which a diameter is reduced in a refrigerant flow direction.
  • the expanding part may be provided at all of the outlet passages except the first outlet passage 34 a, or provided at parts of the outlet passages except the first outlet passage 34 a.
  • FIGS. 7B and 7C show an embodiment in which the two evaporating parts are provided, wherein the expanding means 30 includes the expanding part before branching 35 and the second expanding part 35 b (i.e., which is similar to the embodiment of FIG. 7A that the expanding part is not provided at the first outlet passage 34 a, but provided at the inlet passage 33 and the rest of the outlet passages).
  • FIG. 7B shows a case that all of the expanding part before branching 35 and the second expanding part 35 b are the expansion valves
  • FIG. 7C shows a case that the expanding part before branching 35 is the expansion valve
  • the second expanding part 35 b is the reducing means.
  • FIG. 7D shows an embodiment in which the two evaporating parts are provided, wherein the expanding part is not provided at the inlet passage 33 (i.e., the expanding part before branching 35 is not provided), and each expanding part is provided at each outlet passage.
  • the expanding means 30 includes the expanding parts 35 a to 35 n which are respectively disposed at the outlet passages 34 a to 34 n so as to throttle the refrigerant.
  • the expanding part 35 a to 35 n is formed so that a pressure reduction level is controlled by adjusting an opening degree thereof.
  • the expanding means 30 is formed so that a pressure reduction value of the refrigerant supplied to the evaporating part disposed at the downstream of the flow direction of the air blown by the blower 60 is larger than that of the refrigerant supplied to the evaporating part disposed at the upstream of the flow direction.
  • the construction of the expanding means 30 is not limited to the descriptions as described above and the present invention of FIG. 7 .
  • the expanding means 30 may be formed so that the pressure reduction value of the refrigerant supplied to the evaporating part disposed at the upstream of the flow direction of the air blown by the blower 60 is larger than that of the refrigerant supplied to the evaporating part disposed at the downstream of the flow direction.
  • FIGS. 7A , 7 B and 7 C are examples of the expanding means which satisfy the conditions described above.
  • the conditions may be satisfied by controlling the opening degree of the first and second expanding parts 35 a and 35 b. All constructions which can satisfy the above-mentioned conditions are included in the scope of the present invention, although they are not shown in FIG. 7 .
  • the expanding means 30 may be formed so that the pressure reduction value of the refrigerant supplied to the evaporating part in which a relatively small flow rate is supplied is larger than that of the refrigerant supplied to the evaporating part in which a relatively larger flow rate is supplied.
  • FIG. 8 is a view showing a p-h line in a refrigerating cycle device having a conventional evaporator and an evaporator of the present invention which is divided into two evaporating parts
  • FIG. 9 is a view showing a pressure drop rate in the refrigerating cycle device.
  • a point A is an inlet port of a compressor
  • a point B is an outlet port of the compressor
  • a point C is an outlet port of a condenser
  • a point D is an inlet port of a conventional evaporator
  • a point D #1 is an inlet port of a region # 1 in an evaporator of the present invention
  • a point D #2 is an inlet port of a region # 2 in the evaporator of the present invention
  • a point E is an outlet port of the evaporator.
  • the present invention it is also possible to enhance the evaporation of the refrigerant by reducing the pressure of the refrigerant (the pressure of the inlet port of the evaporator) supplied through the expanding means to the evaporator corresponding to decrease of the pressure loss in the evaporator.
  • ⁇ P conventional type pressure drop rate in the conventional evaporator
  • ⁇ P #2 pressure drop rate in the conventional evaporator
  • a total pressure drop rate occurred in the evaporator is not a sum of the pressure drop rates occurred in each region, but depends on the largest pressure loss value occurred in the regions. Thus, it is possible to further increase the improvement effect of the pressure loss.
  • FIG. 5 shows an embodiment in which a multi-evaporation system of the present invention has an ejector.
  • an ejector 50 is further provided between the evaporator 40 and the compressor 10 so as to mix the refrigerant discharged from the evaporator 40 and thus improve the conditions such as pressure and temperature.
  • each refrigerant passing through the evaporating parts 41 to 4 N has a different pressure and temperature condition from each other. If the branched passages are combined into one, the mixing is naturally occurred and thus the conditions such as the pressure and temperature will be equalized. However, the refrigerant may be not completely mixed before being supplied to the compressor 10 , and thus the efficiency in the compressor 10 may be partially reduced. In the embodiment of FIG. 5 , in order to avoid the problem, the ejector 50 is provided between the evaporator 40 and the compressor 10 .
  • FIG. 6 shows an embodiment of the ejector according to the present invention. As shown in FIG.
  • the ejector 50 includes a nozzle part 51 which decompresses and expands the refrigerant discharged from a part of the first to Nth evaporating parts 41 to 4 N and also increases a flow speed of the refrigerant, a suction part 52 which sucks the refrigerant discharged from part or whole of the rest of the evaporating parts using an increased flow speed of the refrigerant injected from the nozzle part 51 , a diffuser part 53 which mixes the refrigerant injected from the nozzle part 51 and the refrigerant sucked through the suction part 52 and then raise pressure of the mixed refrigerant.
  • the refrigerant discharged from a part of the evaporating parts 41 to 4 N is flowed into the nozzle part 51 of the ejector 50 , and the refrigerant discharged from the rest is flowed into the suction part 52 of the ejector, and then the refrigerants is mixed in the diffuser part 53 of the ejector 50 .
  • the refrigerants discharged from the evaporating parts 41 to 4 N may be adapted to pass through the ejector 50 , or a part of the refrigerants may be adapted to be naturally mixed without passing through the ejector 50 .
  • the ejector 50 is formed so that the refrigerant has a subsonic speed. Most of the generator ejectors are formed so that the refrigerant passing through the ejector has a supersonic speed. In this case, a noise generated from the ejector is very large. Since the evaporation system of the present invention is installed in a vehicle, it is necessary to restrain the generation of the noise. Therefore, in the present invention, the refrigerant in the ejector 50 has a subsonic speed instead of a supersonic speed. Accordingly, the ejector 50 efficiently mixes the refrigerants without generation of the noise.
  • the present application contains subject matter related to Korean Patent Application No. 10-2009-0042057, filed in the Korean Intellectual Property Office on May 14, 2009 Korean Patent Application No. 10-2009-0119621, filed in the Korean Intellectual Property Office on Dec. 4, 2009, Korean Patent Application No. 10-2009-0119628, filed in the Korean Intellectual Property Office on Dec. 4, 2009 and Korean Patent Application No. 10-2009-0119633, filed in the Korean Intellectual Property Office on Dec. 4, 2009 the entire contents of which is incorporated herein by references.
  • the refrigerants passing through the evaporating parts 41 to 4 N are passed through the ejector 50 so as to be smoothly mixed with each other, it is possible to stabilize the pressure and temperature of the refrigerant flowed into the compressor 10 .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
US13/001,117 2009-05-14 2010-05-14 Multi-evaporation system Abandoned US20110113803A1 (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
KR20090042057 2009-05-14
KR10-2009-0042057 2009-05-14
KR1020090119621A KR101250764B1 (ko) 2009-05-14 2009-12-04 차량용 에어컨의 냉동 사이클
KR10-2009-0119628 2009-12-04
KR10-2009-0119633 2009-12-04
KR1020090119628A KR101220116B1 (ko) 2009-12-04 2009-12-04 다중 증발 시스템
KR1020090119633A KR101208929B1 (ko) 2009-12-04 2009-12-04 2중 증발 시스템
KR10-2009-0119621 2009-12-04
PCT/KR2010/003044 WO2010131918A2 (ko) 2009-05-14 2010-05-14 다중 증발 시스템

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CN102670001A (zh) * 2012-05-09 2012-09-19 海信容声(广东)冷柜有限公司 一种节能陈列柜
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CN113340011A (zh) * 2021-06-08 2021-09-03 四川大学 用于制冷及热泵循环系统的换热器快速切换机构及方法
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CN102187165A (zh) 2011-09-14
WO2010131918A3 (ko) 2011-03-03
CN102187165B (zh) 2014-01-29
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EP2314957A4 (en) 2012-01-25
EP2314957A2 (en) 2011-04-27
EP2314957B1 (en) 2016-06-29

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