CA2167618A1 - Evaporator for automotive air conditioner - Google Patents
Evaporator for automotive air conditionerInfo
- Publication number
- CA2167618A1 CA2167618A1 CA002167618A CA2167618A CA2167618A1 CA 2167618 A1 CA2167618 A1 CA 2167618A1 CA 002167618 A CA002167618 A CA 002167618A CA 2167618 A CA2167618 A CA 2167618A CA 2167618 A1 CA2167618 A1 CA 2167618A1
- Authority
- CA
- Canada
- Prior art keywords
- tubes
- evaporator
- group
- groups
- rows
- 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.)
- Abandoned
Links
Classifications
-
- 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
-
- 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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
-
- 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
- F28D1/047—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 bent, e.g. in a serpentine or zig-zag
- F28D1/0477—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 bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A tube and fin type evaporator for an automotive air-conditioning system is disclosed having four rows of nine tubes each and a height of about nine inches. The tubes are divided into three circuits of equal length. A venturi type flow distributor is mounted in an inlet coupling to supply two phase refrigerant flow to the circuits.
Description
EVAPORATOR FOR AUTOMOTIVE AIR CONDITIONER
This invention relates to automotive evaporators or cooling coils, and in particular, to tube and fin type evaporators having a height of about nine inches and a thickness of about three inches.
Automotive evaporators are application specific in that for a given make or line of vehicles, the design of the vehicle calls for an evaporator having very specific size and configuration limitations. One of these applications calls for an evaporator having a height of about 9 inches and a thickness of about 3 to 3 1/4 inches in order for the evaporator to fit inside an air duct or plenum as used in particular by Chrysler~ Corporation.
Given these restraints, it has been conventional in the past to make such an evaporator of a tube and fin type having five rows of nine tubes, or forty-five tubes in total, and these tubes have been connected together in various configurations or circuits. Because the air flow through the evaporator is usually not uniform, it is difficult to get the heat transfer in each of the circuits to be the same, with the result that super heating of the refrigerant in each circuit is not uniform and super heating may not even occur in one or more of the circuits.
This decreases the efficiency of the evaporator dramatically, because the expansion valve in the system tries to compensate for this by reducing the refrigerant flow through the evaporator with the result that the overall heat transfer taking place in the evaporator is reduced.
The traditional approach to try to overcome some of the above-mentioned problems is to arrange the tubes into multiple circuits of different lengths or containing different numbers of tubes. The evaporator has to have a minimum number of tubes in order to ensure that super heating occurs in the circuit of the shortest length or containing the least number of tubes. Until the present invention, it has not been thought possible to make an 21676~
evaporator of the subject type having less than five rows of nine tubes, or forty-five tubes in total.
Surprisingly, applicant has found that one whole row of nine tubes can be eliminated making the evaporator of the present invention less costly to produce.
According to the invention, there is provided an automotive evaporator of the tube and fin type comprising a plurality of elongate, parallel, spaced-apart, equal length tubes mounted in a pair of spaced-apart end plates with the tube ends projecting therefrom. A plurality of spaced-apart fins are located between the plates and disposed transversely of and surrounding the tubes. The tubes are arranged in four rows of nine tubes each, the rows being approximately 9 inches in height. The tubes are arranged in at least two groups of equal numbers of tubes, one of the tubes of each group being an inlet tube and another one of the tubes in each group being an outlet tube. A plurality of return bends joins the tube ends in each group to form a continuous equal length circuit between the inlet and the outlet tubes of each group. A
venturi type flow distributor is coupled to feed refrigerant to the inlet tubes of each group, and a return manifold is coupled to the outlet tubes of each group.
Preferred embodiments of the invention will now be described, by which of example, with reference to the accompanying drawings, in which:
Figure 1 is a front elevational view of a preferred embodiment of an evaporator according to the present invention;
Figure 2 is a rear elevational view of the evaporator shown in Figure l;
Figure 3 is a top or plan view of the evaporator shown in Figures 1 and 2;
Figure 4 is a left end view of the evaporator shown in Figures 1 and 3;
Figure 5 is a right end view of the evaporator shown in Figures 1 and 3;
10Figure 6 is a view similar to Figure 5 with the inlet distribution tubes and the outlet manifold removed;
Figure 7 is a schematic view showing the tube connections or flow circuits in the evaporator shown in Figures 1 to 6;
Figure 8 is a schematic view of an alternative embodiment of the tube circuits of the present invention;
20Figure 9 is a schematic view of yet another embodiment of the tube circuits of the present invention; and Figure 10 is a schematic view of yet another embodiment of the tube circuits of the present invention.
Referring to the drawings, a preferred embodiment of an evaporator according to the present invention is generally indicated by reference numeral 10. Evaporator 10 has thirty-six parallel, spaced-apart, equal length tubes or tube passes 12 arranged in four rows of nine tubes each.
Tubes 12 are typically 3/8 inch o.d. on a center line to center line spacing of 1 inch making the height of evaporator 10 about 9 inches. The rows of tubes are spaced apart 0.75 inches making the width or thickness of evaporator 10 about 3 to 3.25 inches. Tubes 12 are typically 11 to 12 inches in length, but the tubes can be other lengths, as desired. Tubes 12 are preferably formed of copper, but they can be made of aluminum, if desired.
Tubes 12 are mounted in a pair of spaced-apart end plates 14, 16 with the ends of the tubes projecting outwardly therefrom. Actually, at end plate 14 which is called the hairpin end 15 of the evaporator, the tubes are bent into a "U", so that one U-shaped tube forms two tube passes as is conventional in the art. At the other end of the evaporator where end plate 16 is located, the tubes are joined together using 180 degree elbows or return bends 17.
This is called the return bend end 20 of the evaporator.
The return bends 17 are positioned to make the various flow circuits, as will be described further below.
Fins 18 are located between end plates 14, 16 and are disposed transversely of and surround tubes 12. Fins 18 are formed of aluminum and the spacing therebetween is such as to give 14 fins per inch. Other fin configurations can be used as well. Tubes 12 are connected together in groups to form flow circuits using return bends 17 at return bend end 20 of evaporator 10, as mentioned above.
Referring in particular to Figures 6 and 7, in a preferred embodiment, return bends 17 are placed to form three groups or circuits 22, 24 and 26 of 12 tubes each.
Each circuit has one tube 28 forming an inlet tube and one tube 30 forming an outlet tube. The inlet tubes 28 are each connected to inlet distribution tubes 32 (see Figures 1 to 3) and distribution tubes 32 are in turn connected to a venturi-type flow distributor 34 mounted in a coupling or block fitting 36. Block fitting 36 is designed to be connected to a particular type of expansion valve (not shown) in the automotive refrigeration system.
Outlet tubes 30 are connected by tubes 38 to an outlet or return manifold 40 which is also connected to or mounted in block fitting 36. 810ck fitting 36 has an inlet opening 42 communicating with the venturi flow distributor 34 and an outlet opening 44 communicating with return manifold 40, thus forming the respective refrigerant inlet and outlet for evaporator 10.
Referring again to Figure 7, it will be noted that tube circuits 22, 24 and 26 each have twelve tube passes and each circuit has three tube passes in each of the four rows of tubes in evaporator 10. Two of the circuits, namely 24 and 26, have respective return bends 46 and 48 that cross over each other, so that the two circuits 24, 26 overlap. In this way, if there is an unequal or non-uniform air flow through evaporator 10 in the area of circuits 24, 26, both circuits are exposed generally equally to this air flow. Inlet distribution tubes 32 are slightly over-sized, for the expansion valve to which evaporator 10 is usually connected, being 1/4 inch o.d. tubes. Smaller diameter tubes give too much pressure drop and it is not desirable to have the tubes much larger or the flow velocity in the tubes will be undesirably low.
Referring next to Figure 8, another embodiment of evaporator 10 is shown wherein the tubes are arranged in two groups or tube circuits 50, 52 having eighteen tubes each. Each group has five tubes in two of the four rows of tubes and four tubes in the other two of the four rows.
Again, each circuit 50, 52 has one of the return bends 54, 56 crossing over, so that the two groups overlap to give equal exposure to any non-uniform air flow through the evaporator. The inlet distribution tubes that are connected to inlet tubes 28 in this embodiment would be 5/16 to 3/8 inch o.d., which again is slightly over-sized for the expansion valve to which the evaporator is connected.
Referring next to Figure 9, the tubes in this embodiment are connected together or arranged into four groupæ or tube circuits 58, 60, 62 and 64 each having nine tubes each. Each tube circuit has two tubes in three of the four rows of tubes and three tubes in one of the four rows of tubes. The row having the two tubes is different for each of the tube circuits 58 to 64. Again, two of the tube circuits, namely 58 and 62, have return bends 66 and 68 that cross over, so that these two circuits overlap giving a more equalized exposure to uneven air flow through the evaporator in the area of these circuits.
Figure 10 shows yet another embodiment having four tube circuits 70, 72, 74 and 76 each having nine tubes. The groups are divided into two pairs 78 and 80 with at least one of the return bends of each group of a pair of groups cro6sing over each other to cause the groups of each pair to overlap. Again, this exposes the tube circuits more equally to air flow maldistributions or uneven flow through the evaporator.
Having described preferred embodiments of the invention, it will be appreciated that various other modifications may be made to the structures described above. For example, the inlet and outlet connections or configuration could be changed to suit different applications. Some changes could be made to the dimensions described above, in particular the diameters and lengths of the various tubes and the fin height and spacing. Although copper tubes and aluminum fins are preferred, other materials could be used as will be appreciated by those skilled in the art.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be 21676i8 construed in accordance with the substance defined by the following claims.
This invention relates to automotive evaporators or cooling coils, and in particular, to tube and fin type evaporators having a height of about nine inches and a thickness of about three inches.
Automotive evaporators are application specific in that for a given make or line of vehicles, the design of the vehicle calls for an evaporator having very specific size and configuration limitations. One of these applications calls for an evaporator having a height of about 9 inches and a thickness of about 3 to 3 1/4 inches in order for the evaporator to fit inside an air duct or plenum as used in particular by Chrysler~ Corporation.
Given these restraints, it has been conventional in the past to make such an evaporator of a tube and fin type having five rows of nine tubes, or forty-five tubes in total, and these tubes have been connected together in various configurations or circuits. Because the air flow through the evaporator is usually not uniform, it is difficult to get the heat transfer in each of the circuits to be the same, with the result that super heating of the refrigerant in each circuit is not uniform and super heating may not even occur in one or more of the circuits.
This decreases the efficiency of the evaporator dramatically, because the expansion valve in the system tries to compensate for this by reducing the refrigerant flow through the evaporator with the result that the overall heat transfer taking place in the evaporator is reduced.
The traditional approach to try to overcome some of the above-mentioned problems is to arrange the tubes into multiple circuits of different lengths or containing different numbers of tubes. The evaporator has to have a minimum number of tubes in order to ensure that super heating occurs in the circuit of the shortest length or containing the least number of tubes. Until the present invention, it has not been thought possible to make an 21676~
evaporator of the subject type having less than five rows of nine tubes, or forty-five tubes in total.
Surprisingly, applicant has found that one whole row of nine tubes can be eliminated making the evaporator of the present invention less costly to produce.
According to the invention, there is provided an automotive evaporator of the tube and fin type comprising a plurality of elongate, parallel, spaced-apart, equal length tubes mounted in a pair of spaced-apart end plates with the tube ends projecting therefrom. A plurality of spaced-apart fins are located between the plates and disposed transversely of and surrounding the tubes. The tubes are arranged in four rows of nine tubes each, the rows being approximately 9 inches in height. The tubes are arranged in at least two groups of equal numbers of tubes, one of the tubes of each group being an inlet tube and another one of the tubes in each group being an outlet tube. A plurality of return bends joins the tube ends in each group to form a continuous equal length circuit between the inlet and the outlet tubes of each group. A
venturi type flow distributor is coupled to feed refrigerant to the inlet tubes of each group, and a return manifold is coupled to the outlet tubes of each group.
Preferred embodiments of the invention will now be described, by which of example, with reference to the accompanying drawings, in which:
Figure 1 is a front elevational view of a preferred embodiment of an evaporator according to the present invention;
Figure 2 is a rear elevational view of the evaporator shown in Figure l;
Figure 3 is a top or plan view of the evaporator shown in Figures 1 and 2;
Figure 4 is a left end view of the evaporator shown in Figures 1 and 3;
Figure 5 is a right end view of the evaporator shown in Figures 1 and 3;
10Figure 6 is a view similar to Figure 5 with the inlet distribution tubes and the outlet manifold removed;
Figure 7 is a schematic view showing the tube connections or flow circuits in the evaporator shown in Figures 1 to 6;
Figure 8 is a schematic view of an alternative embodiment of the tube circuits of the present invention;
20Figure 9 is a schematic view of yet another embodiment of the tube circuits of the present invention; and Figure 10 is a schematic view of yet another embodiment of the tube circuits of the present invention.
Referring to the drawings, a preferred embodiment of an evaporator according to the present invention is generally indicated by reference numeral 10. Evaporator 10 has thirty-six parallel, spaced-apart, equal length tubes or tube passes 12 arranged in four rows of nine tubes each.
Tubes 12 are typically 3/8 inch o.d. on a center line to center line spacing of 1 inch making the height of evaporator 10 about 9 inches. The rows of tubes are spaced apart 0.75 inches making the width or thickness of evaporator 10 about 3 to 3.25 inches. Tubes 12 are typically 11 to 12 inches in length, but the tubes can be other lengths, as desired. Tubes 12 are preferably formed of copper, but they can be made of aluminum, if desired.
Tubes 12 are mounted in a pair of spaced-apart end plates 14, 16 with the ends of the tubes projecting outwardly therefrom. Actually, at end plate 14 which is called the hairpin end 15 of the evaporator, the tubes are bent into a "U", so that one U-shaped tube forms two tube passes as is conventional in the art. At the other end of the evaporator where end plate 16 is located, the tubes are joined together using 180 degree elbows or return bends 17.
This is called the return bend end 20 of the evaporator.
The return bends 17 are positioned to make the various flow circuits, as will be described further below.
Fins 18 are located between end plates 14, 16 and are disposed transversely of and surround tubes 12. Fins 18 are formed of aluminum and the spacing therebetween is such as to give 14 fins per inch. Other fin configurations can be used as well. Tubes 12 are connected together in groups to form flow circuits using return bends 17 at return bend end 20 of evaporator 10, as mentioned above.
Referring in particular to Figures 6 and 7, in a preferred embodiment, return bends 17 are placed to form three groups or circuits 22, 24 and 26 of 12 tubes each.
Each circuit has one tube 28 forming an inlet tube and one tube 30 forming an outlet tube. The inlet tubes 28 are each connected to inlet distribution tubes 32 (see Figures 1 to 3) and distribution tubes 32 are in turn connected to a venturi-type flow distributor 34 mounted in a coupling or block fitting 36. Block fitting 36 is designed to be connected to a particular type of expansion valve (not shown) in the automotive refrigeration system.
Outlet tubes 30 are connected by tubes 38 to an outlet or return manifold 40 which is also connected to or mounted in block fitting 36. 810ck fitting 36 has an inlet opening 42 communicating with the venturi flow distributor 34 and an outlet opening 44 communicating with return manifold 40, thus forming the respective refrigerant inlet and outlet for evaporator 10.
Referring again to Figure 7, it will be noted that tube circuits 22, 24 and 26 each have twelve tube passes and each circuit has three tube passes in each of the four rows of tubes in evaporator 10. Two of the circuits, namely 24 and 26, have respective return bends 46 and 48 that cross over each other, so that the two circuits 24, 26 overlap. In this way, if there is an unequal or non-uniform air flow through evaporator 10 in the area of circuits 24, 26, both circuits are exposed generally equally to this air flow. Inlet distribution tubes 32 are slightly over-sized, for the expansion valve to which evaporator 10 is usually connected, being 1/4 inch o.d. tubes. Smaller diameter tubes give too much pressure drop and it is not desirable to have the tubes much larger or the flow velocity in the tubes will be undesirably low.
Referring next to Figure 8, another embodiment of evaporator 10 is shown wherein the tubes are arranged in two groups or tube circuits 50, 52 having eighteen tubes each. Each group has five tubes in two of the four rows of tubes and four tubes in the other two of the four rows.
Again, each circuit 50, 52 has one of the return bends 54, 56 crossing over, so that the two groups overlap to give equal exposure to any non-uniform air flow through the evaporator. The inlet distribution tubes that are connected to inlet tubes 28 in this embodiment would be 5/16 to 3/8 inch o.d., which again is slightly over-sized for the expansion valve to which the evaporator is connected.
Referring next to Figure 9, the tubes in this embodiment are connected together or arranged into four groupæ or tube circuits 58, 60, 62 and 64 each having nine tubes each. Each tube circuit has two tubes in three of the four rows of tubes and three tubes in one of the four rows of tubes. The row having the two tubes is different for each of the tube circuits 58 to 64. Again, two of the tube circuits, namely 58 and 62, have return bends 66 and 68 that cross over, so that these two circuits overlap giving a more equalized exposure to uneven air flow through the evaporator in the area of these circuits.
Figure 10 shows yet another embodiment having four tube circuits 70, 72, 74 and 76 each having nine tubes. The groups are divided into two pairs 78 and 80 with at least one of the return bends of each group of a pair of groups cro6sing over each other to cause the groups of each pair to overlap. Again, this exposes the tube circuits more equally to air flow maldistributions or uneven flow through the evaporator.
Having described preferred embodiments of the invention, it will be appreciated that various other modifications may be made to the structures described above. For example, the inlet and outlet connections or configuration could be changed to suit different applications. Some changes could be made to the dimensions described above, in particular the diameters and lengths of the various tubes and the fin height and spacing. Although copper tubes and aluminum fins are preferred, other materials could be used as will be appreciated by those skilled in the art.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. Accordingly, the scope of the invention is to be 21676i8 construed in accordance with the substance defined by the following claims.
Claims (12)
1. An automotive evaporator of the tube and fin type comprising:
a plurality of elongate, parallel, spaced-apart, equal length tubes mounted in a pair of spaced-apart end plates with the tube ends projecting therefrom;
a plurality of spaced-apart fins located between the plates and disposed transversely of and surrounding the tubes;
said tubes being arranged in four rows of nine tubes each, said rows being approximately nine inches in height;
said tubes being arranged in at least two groups of equal numbers of tubes, one of said tubes of each group being an inlet tube and another one of said tubes in each group being an outlet tube;
a plurality of return bends joining the tube ends in each group to form a continuous equal length circuit between the inlet and outlet tubes of each group;
a venturi type flow distributor coupled to feed refrigerant to the inlet tubes of each group; and a return manifold coupled to the outlet tubes of each group.
a plurality of elongate, parallel, spaced-apart, equal length tubes mounted in a pair of spaced-apart end plates with the tube ends projecting therefrom;
a plurality of spaced-apart fins located between the plates and disposed transversely of and surrounding the tubes;
said tubes being arranged in four rows of nine tubes each, said rows being approximately nine inches in height;
said tubes being arranged in at least two groups of equal numbers of tubes, one of said tubes of each group being an inlet tube and another one of said tubes in each group being an outlet tube;
a plurality of return bends joining the tube ends in each group to form a continuous equal length circuit between the inlet and outlet tubes of each group;
a venturi type flow distributor coupled to feed refrigerant to the inlet tubes of each group; and a return manifold coupled to the outlet tubes of each group.
2. An automotive evaporator as claimed in claim 1 wherein the venturi distributor is mounted in a coupling adapted to be connected directly to an expansion valve of an automotive refrigeration system.
3. An automotive evaporator as claimed in claim 2 and further comprising a plurality of inlet distribution tubes coupled between the venturi distributor and said inlet tubes, said distribution tubes being slightly over-sized for the expansion valve to be connected to the coupling.
4. An automotive evaporator as claimed in claim 1 wherein said tubes are arranged in three groups of twelve tubes each, each group having three tubes in each of the four rows.
5. An automotive evaporator as claimed in claim 4 wherein at least one of the return bends of two of the groups cross over each other at one end of the evaporator.
6. An automotive evaporator as claimed in claim 1 wherein said tubes are arranged in two groups of eighteen tubes each, each group having five tubes in two of the four rows and four tubes in the other two of the four rows.
7. An automotive evaporator as claimed in claim 6 wherein at least one of the return bends of the two groups cross over each other at one end of the evaporator.
8. An automotive evaporator as claimed in claim 1 wherein the tubes are arranged in four groups of nine tubes each, each group having two tubes in three of the rows and three tubes in one of the rows, said one of the rows being a different row for each group.
9. An automotive evaporator as claimed in claim 8 wherein at least one of the return bends of two of the groups cross over each other at one end of the evaporator.
10. An automotive evaporator as claimed in claim 1 wherein the tubes are arranged in four groups of nine tubes each, the groups being divided into two pairs with at least one of the return bends of each group of a pair of groups crossing over each other at one end of the evaporator.
11. An automotive evaporator as claimed in claim 1 wherein the tubes are 3/8 inch outside diameter and the spacing between the rows is 0.75 inches.
12. An automotive evaporator as claimed in claim 3 wherein the tubes are arranged in three groups of twelve tubes each, and wherein the tubes are 3/8 inch outside diameter and the distribution tubes are 0.25 inch outside diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002167618A CA2167618A1 (en) | 1996-01-19 | 1996-01-19 | Evaporator for automotive air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002167618A CA2167618A1 (en) | 1996-01-19 | 1996-01-19 | Evaporator for automotive air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2167618A1 true CA2167618A1 (en) | 1997-07-20 |
Family
ID=4157388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002167618A Abandoned CA2167618A1 (en) | 1996-01-19 | 1996-01-19 | Evaporator for automotive air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2167618A1 (en) |
-
1996
- 1996-01-19 CA CA002167618A patent/CA2167618A1/en not_active Abandoned
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| Date | Code | Title | Description |
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