JP3277349B2 - Evaporation absorber for absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an evaporator coil for applying heat to a liquid refrigerant to generate refrigerant vapor, and a cooling water coil for removing heat of the refrigerant vapor generated by the evaporator coil and absorbing the heat into an absorbing solution. The present invention relates to an absorption refrigerator for an absorption refrigerator equipped with the absorption refrigerator and an absorption refrigerator equipped with the same.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view for explaining the operation of an evaporator and an absorber of a conventional absorption refrigerator. Evaporator 1
In 00, the refrigerant 103 dropped on the evaporating coil 102 by the refrigerant distributor 101 evaporates while flowing down the evaporating coil 102. The vaporized refrigerant vapor once flows upward or downward along the evaporating coil 102 like a refrigerant vapor flow 104, then proceeds to the left, passes through a hole in the partition wall 105, and then passes through the absorber 106 Get in. The refrigerant vapor entering the absorber 106 flows between the cooling water coils 107 downward from above or upward from below as shown in the figure, and is dropped on the surface of the cooling water coil 107 by the solution distributor 108 to be cooled. Concentrated solution 10 flowing down the surface
Absorbed by 9.

FIG. 8 is a plan view of an evaporator 100 and an absorber 106 of an absorption refrigerator according to the prior art. Evaporator 100
And an absorber 106 are partitioned by a partition 105, an evaporating coil 102 is provided on the outside, and a cooling water coil 107 is provided on the inside,
The evaporating coil 102 is provided with a refrigerant inlet manifold 111 and a refrigerant outlet manifold 112 to supply liquid refrigerant. Similarly, the cooling water coil 107 is provided with a solution inlet manifold 113 and a solution outlet manifold 114 to supply a concentrated solution. An outer shell (not shown) is provided outside the evaporator 100.

[0004]

However, the evaporator 100 and the absorber 106 of the conventional absorption refrigerator have the evaporator 1
00 and the absorber 106 are completely independent of each other, and the functions of the respective refrigerants may be deteriorated due to the long flow path of the refrigerant vapor. To compensate for this reduced function, the function per unit surface area is further reduced by increasing the respective surface areas. This is more pronounced in large capacity absorption chillers. In order to cover the reduced function, the physical size is increased, and there is a fear that more material is required and the cost is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide an economical evaporative absorber for an absorption refrigerator, which has good efficiency of evaporating liquid refrigerant and absorbing refrigerant vapor and can be downsized, and an absorption refrigerator equipped with the same. It is to be.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, an evaporative absorber for an absorption refrigerator according to the present invention provides heat to a liquid refrigerant to generate refrigerant vapor, and an evaporator coil having a plurality of unit coils. A cooling water coil having a plurality of unit coils, which takes away the heat of the refrigerant vapor generated in the evaporation coil and absorbs the refrigerant vapor into the absorbing solution, wherein the unit coil of the evaporation coil and the unit coil of the cooling water coil are: Exchange
They are arranged adjacent to each other .

Further, two unit cores of the evaporation coil are provided.
Between the two coils of the cooling water coil
The structure is sandwiched.

[0008] According to this structure , an evaporating coil having a plurality of unit coils and a cooling water coil having a plurality of unit coils are provided. The refrigerant vapor evaporated in step (1) is immediately absorbed by the absorbing solution flowing down on the unit coil of the cooling water coil, and the efficiency of the evaporation of the liquid refrigerant and the absorption of the refrigerant vapor is good.

Or a high-temperature regenerator, a separator, a low-temperature regenerator,
An absorption refrigerator in which a condenser, a solution circulation pump, and the like are connected to form a circulation circuit for a refrigerant and an absorption solution, the absorption refrigerator including any one of the above-described evaporation refrigerators for an absorption refrigerator. An absorption refrigerator provided with any one of the above-mentioned evaporative absorbers for an absorption refrigerator has the function of the above-mentioned evaporative absorber for an absorption refrigerator.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an evaporator and an absorption refrigerator having the same according to the present invention will be described below in detail with reference to the drawings. In FIGS. 1 to 6, the same structures and working parts are denoted by the same reference numerals.

FIG. 1 is a partially omitted sectional view showing one embodiment of an evaporative absorber for an absorption refrigerator according to the present invention. The evaporative absorber 2 for an absorption refrigerator of the present embodiment is a so-called evaporative absorber in which a conventional evaporator and an absorber are integrated. Evaporation coil 3 for applying heat to liquid refrigerant 50 to generate refrigerant vapor
And a cooling water coil 13 which takes away the heat of the refrigerant vapor generated in the evaporating coil 3 and absorbs it in the absorbing solution 52. The evaporating coil 3 and the cooling water coil 13 each have a plurality of unit coils 4 and 14, and the unit coil 4 of the evaporating coil 3 and the unit coil 14 of the cooling water coil 13 are alternately arranged at an appropriate distance. Are adjacent to each other. A refrigerant distributor 9 is provided on the evaporating coil 3, and a solution distributor 1 is similarly provided on the cooling water coil 13.
9 are provided.

FIGS. 2A and 2B show the evaporating coil 3 and the cooling water coil 13 shown in FIG. 1, wherein FIG. 2A is a perspective view and FIG. 2B is a side view of a connecting portion between the manifold and the unit coil. As shown in FIG. 2A, the evaporative absorber 2 according to the present embodiment includes a unit coil 4 of an evaporating coil 3 and a cooling water coil 1.
The three unit coils 14 are alternately arranged concentrically and are adjacent to each other. The evaporating coil 3 has, for example, an inlet manifold 5 into which cold and hot water flows and an outlet manifold 6 from which cold and hot water flows. On the other hand, the cooling water coil 13 has an inlet manifold 15 into which cooling water flows and an outlet manifold 16 from which cooling water flows.

As shown in FIG. 2B, the unit coil 4 or 14 is connected to the inlet manifold 5 or 15 obliquely upward. As for the outlet manifold 6 or 16, the unit coil 4 or 14 is also connected obliquely downward.

FIG. 3 is a perspective view of the refrigerant distributor 9 or the solution distributor 19 used in FIG. A plurality of drippers 1 are provided on the outside and inside of the annular container 10 or 20 having a U-shaped cross section.
1 or 21 is attached. The attachment of the dripper 11 or 21 may be only outside or inside.

FIG. 4 is a sectional view for explaining the operation of the evaporative absorber for an absorption refrigerator according to the present invention. The liquid refrigerant 50 dropped on the plurality of unit coils 4 of the evaporating coil 3 by the refrigerant distributor 9 evaporates while flowing down the unit coils 4. The refrigerant vapor that has been vaporized into vapor flows into the unit coil 14 of the immediately adjacent cooling water coil 13 without any hindrance, like the flow 51 of the refrigerant vapor, and once flows up or down along the unit coil 4. After flowing downward, it proceeds to the left or right, and as shown in the drawing, the unit coil 14 is directed downward from above or upward from below along a plurality of unit coils 14 of the adjacent cooling water coil 13 at an appropriate distance.
The concentrated solution 5 flowing along the surface of the unit coil 14 and being dropped by the solution distributor 19 and flowing down along the surface of the unit coil 14
2 to be absorbed.

Thus, when compared with the conventional method,
Since the vapor concentration around the evaporating coil is kept low, evaporation on the evaporating coil surface is easily performed, and the flow path of the refrigerant vapor is very short, so that it is immediately absorbed. For this reason, the unit coils 4 of all the evaporating coils 3 and the cooling water coils 1
The third unit coil 14 exhibits almost the same effect.
Since there is no wasted unit coil 4 or unit coil 14, the substantial surface area of each coil can be reduced, the efficiency of evaporation of liquid refrigerant and absorption of refrigerant vapor is good, and the amount of ineffective refrigerant is reduced. O. P. Can be improved. In addition, miniaturization is possible, and at the same time, material costs can be reduced.

FIG. 5 is a sectional view showing another embodiment of the evaporative absorber for an absorption refrigerator according to the present invention. The evaporative absorber 2 for an absorption refrigerator according to the present embodiment has a configuration in which two unit coils 14 of a cooling water coil 13 are sandwiched between two unit coils 4 of an evaporating coil 3. One side 7 of the unit coil 4 of the evaporation coil and one side 17 of the unit coil 14 of the cooling water coil are adjacent to each other.
Even in such a structure, the same operation and effect as the evaporative absorber of the embodiment of FIG. 4 described above, that is, the refrigerant vapor evaporated on the unit coil 4 of the evaporator coil to become the vapor is immediately adjacent to the cooling water. It can flow into the unit coil 14 of the coil without any hindrance, and all the evaporating coils 3
The unit coil of the cooling water coil 13 exhibits almost the same effect, and there is no useless unit coil.

FIG. 6 is a system diagram showing an embodiment of the absorption refrigerator according to the present invention. An absorption refrigerator 1 according to the present embodiment includes the above-described evaporative absorber 2. The absorption refrigerator 1 uses, as a working fluid, an absorption solution obtained by absorbing water as a refrigerant into lithium bromide (LiBr) as an absorbent. The LiBr concentration of the absorbing solution fluctuates as the working fluid circulates through the apparatus, and this fluctuation can be roughly divided into three stages. From the lower concentration level, the dilute solution, the intermediate concentrated solution, and the concentrated solution are called. .

The illustrated absorption refrigerator 1 comprises a high-temperature regenerator 23 provided with means for heating the contained absorption solution (dilute solution),
A separator 28 disposed above the high-temperature regenerator 23 and connected to the high-temperature regenerator 23 by an ascending pipe 27, and a refrigerant vapor having one end connected to a gas phase portion of the separator 28 via a refrigerant vapor pipe 29 A low-temperature regenerator 31 having a coil 32 therein, and a condensing refrigerant vapor pipe connected to a gas phase portion of the low-temperature regenerator 31 and communicated with a secondary refrigerant vapor pipe 35 and connected to the other end of the refrigerant vapor coil 32 33, a condenser 34 having a cooling water coil 44 therein, and a flow control valve 37
And a solution circulation pump connected to a suction side of a dilute solution suction pipe 45 at the bottom of the evaporator / absorber 2 and connected to a liquid refrigerant pipe 36 interposed therebetween. A low-temperature solution heat exchanger 42 having a heated fluid inlet side connected to the discharge side of the solution circulation pump 46; and a heated fluid inlet side connected to the heated fluid outlet side of the low-temperature solution heat exchanger 42. The outlet side is the high temperature regenerator 23
A high-temperature solution heat exchanger 38 connected to the dilute solution inlet, an intermediate concentrated solution pipe 30 connecting the liquid phase portion of the separator 28 and the heating fluid inlet of the high-temperature solution heat exchanger 38, An intermediate concentrated solution pipe 39 connected to the heating fluid outlet side of the low temperature regenerator 31 and a concentrated solution pipe 4 connected to the bottom of the low temperature regenerator 31 and the heating fluid inlet side of the low temperature solution heat exchanger 42.
0, a concentrated solution pipe 41 connecting the heated fluid outlet side of the low-temperature solution heat exchanger 42 and the upper part of the evaporator 2,
8, a cooling / heating switching connection pipe 48 for connecting the liquid phase section 8 and the evaporative absorber 2 via a cooling / heating switching valve 47,
3 and a cooling water pipe 43 connecting the inlet side of the cooling water coil 44.

The outlet side of the cooling water coil 44 is connected to a cooling tower (not shown).
Is connected to the cooling tower via a cooling water pump (not shown).

The operation of the absorption chiller of the present embodiment having the above configuration during normal cooling operation will be described below. In the cooling operation, the cooling / heating switching valve 47 is closed. The dilute solution in the high-temperature regenerator 23 is heated by the heating source 25, rises in the riser 27 in a gas-liquid two-phase state, and flows into the separator 28. The dilute solution in a gas-liquid two-phase state flowing into the separator 28 is separated into a refrigerant vapor and an intermediate concentrated solution, and the refrigerant vapor flows into a condenser 34 via a refrigerant vapor coil 32 provided in a low-temperature regenerator 31,
The intermediate concentrated solution flows into the heated fluid side of the high-temperature solution heat exchanger 38 via the intermediate concentrated solution pipe 30. The intermediate concentrated solution 30 flowing into the high temperature solution heat exchanger 38 passes through the high temperature solution heat exchanger 38 while heating the dilute solution flowing on the heated fluid side, and flows into the low temperature regenerator 31 via the intermediate concentrated solution pipe 39. Then, it is sprayed on the refrigerant vapor coil 32. The refrigerant vapor flowing in the refrigerant vapor coil 32 heats the surrounding intermediate concentrated solution to evaporate the refrigerant to generate a secondary refrigerant vapor, which is cooled and condensed to form a gas-liquid two-phase condenser 34. Flows into. Low temperature regenerator 3
The secondary refrigerant vapor generated in 1 also flows into the condenser 34 through the secondary refrigerant vapor pipe 35, and is cooled by the cooling water flowing in the cooling water coil 44 together with the refrigerant flowing through the refrigerant vapor coil 32. It condenses and becomes a liquid refrigerant.

The liquid refrigerant generated in the condenser 34 flows into the evaporator 2 through the liquid refrigerant pipe 36, drops on the evaporator coil 3, and takes heat of the heat medium flowing through the evaporator coil 3 to evaporate. Then, the vapor again becomes the refrigerant vapor, reaches the unit coil 14 of the cooling water coil 13 adjacent to the unit coil 4 of the evaporation coil 3, and is absorbed by the absorbing solution flowing on the surface of the unit coil 14. On the other hand, for example, cold and hot water, which is a heat medium that has been deprived of heat and cooled, is guided to a cooling load, performs cooling, and returns to the evaporating coil 3 again. The intermediate concentrated solution obtained by evaporating the refrigerant as the secondary refrigerant vapor in the low temperature regenerator 31 becomes a concentrated solution, and flows into the heated fluid inlet side of the low temperature solution heat exchanger 42 via the concentrated solution pipe 40. The concentrated solution that has flowed into the low-temperature solution heat exchanger 42 heats the dilute solution flowing on the heated fluid side,
It flows into the evaporative absorber 2 via the concentrated solution pipe 41. The concentrated solution flowing into the evaporation absorber 2 is dropped on the cooling water coil 13 and absorbs the refrigerant vapor evaporated from the evaporation coil 3 to become a dilute solution as described above. The heat of absorption generated when the concentrated solution absorbs the refrigerant vapor is transferred to the cooling water flowing in the cooling water coil 13 and transferred to the cooling tower.

The dilute solution generated in the evaporator 2 is sucked into the solution circulation pump 46 through the dilute solution suction pipe 45, pressurized and flows into the low temperature solution heat exchanger 42 on the side of the fluid to be heated. The dilute solution flowing into the low-temperature solution heat exchanger 42 is heated by the concentrated solution flowing on the heating fluid side while the low-temperature solution heat exchanger 42
And flows into the heated fluid side of the high-temperature solution heat exchanger 38. The dilute solution flowing into the high-temperature solution heat exchanger 38 passes through the high-temperature solution heat exchanger 38 while being heated by the intermediate concentrated solution flowing on the heating fluid side, and flows into the high-temperature regenerator 23. The dilute solution flowing into the high-temperature regenerator 23 repeats the above cycle again.

The cooling water, which takes away the heat of absorption by the cooling water coil 13 and the heat of condensation by the cooling water coil 44, flows into the cooling tower and discharges the absorbed heat and heat of condensation into the atmosphere. During normal operation, the above-described cycle is repeated.

The absorption refrigerator 1 according to the present embodiment having the above-described configuration is provided with the absorption absorber 2 for the absorption refrigerator, whereby the functions of evaporation and absorption are enhanced, and the efficiency of the cooling operation is improved. At the same time, it is possible to reduce the size and to reduce the material cost during production.

[0026]

The evaporative absorber for an absorption refrigerator according to the present invention has a good efficiency of evaporating the liquid refrigerant and absorbing the refrigerant vapor, can be reduced in size, and is economical.

Further, the absorption refrigerator of the present invention has the effect of the evaporation absorber for the absorption refrigerator of the present invention.

[Brief description of the drawings]

FIG. 1 is a partially omitted sectional view showing an embodiment of an evaporative absorber for an absorption refrigerator according to the present invention.

FIG. 2 shows the evaporator coil and cooling water coil of FIG. 1,
(A) is a perspective view, (B) is a side view of a connection portion between the manifold and the unit coil.

FIG. 3 is a perspective view of a refrigerant distributor or a solution distributor used in FIG.

FIG. 4 is a sectional view for explaining the operation of the evaporative absorber for an absorption refrigerator according to the present invention.

FIG. 5 is a cross-sectional view showing another embodiment of the evaporative absorber for an absorption refrigerator according to the present invention.

FIG. 6 is a system diagram showing an embodiment of an absorption refrigerator according to the present invention.

FIG. 7 is a cross-sectional view illustrating the operation of an evaporator and an absorber of an absorption refrigerator according to the related art.

FIG. 8 is a plan view of an evaporator and an absorber of an absorption refrigerator according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorption refrigerator 2 Evaporation absorber 3 Evaporation coil 4 Unit coil 7 One side 13 Cooling water coil 14 Unit coil 17 One side 23 High temperature regenerator 28 Separator 31 Low temperature regenerator 34 Condenser 46 Solution circulation pump

Claims (3)

(57) [Claims] 1. A method for applying a heat to a liquid refrigerant to generate a refrigerant vapor, evaporating a coil having a plurality of unit coils, and removing heat of the refrigerant vapor generated by the evaporating coil to cause the absorbing solution to absorb the vapor into a plurality of units. A cooling water coil having a coil, wherein the unit coil of the evaporating coil and the unit coil of the cooling water coil are alternately arranged and adjacent to each other. 2. The evaporating coil according to claim 1, wherein
Two units of the cooling water coil between two unit coils
An evaporative absorber for an absorption refrigerator characterized by sandwiching a knit coil . 3. A high-temperature regenerator, separator, low temperature generator, a condenser, and connecting the solution circulating pump, and the like in the absorption refrigerating machine forming the circulation circuit of the refrigerant and the absorbent solution, according to claim 1 or
3. An absorption refrigerator comprising the evaporative absorber for the absorption refrigerator of item 2.