JPH10238886A - Absorption refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the condensation of a body and to eliminate the need for mounting a heat insulator by arranging an evaporator and an absorber in the body being arranged while its axis line is nearly vertical, arranging the evaporator near the center axis of the body, and arranging the absorber at the outer periphery of the evaporator. SOLUTION: In an absorber, normally, an absorption solution (a strong solution) of 40-50 deg.C is distributed on cooling. An evaporator is arranged at the inside of a partition wall 8c and the absorber is arranged at the outside of the partition wall 8c, namely a side in contact with the inner-periphery surface of a body outer periphery wall 8, thus setting the temperature of the body to roughly the same temperature as that of the absorption solution, thus preventing dew formation outside the body regardless of the operation atmosphere conditions of an absorption refrigerator. Furthermore, a refrigerant that cannot be evaporated drops to the lower part of an evaporation coil 3. However, a body bottom surface 8b is inclined so that a center side becomes lower, so that the absorption solution flows from the absorber side to the center side, namely to the lower part of the evaporation coil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an absorption refrigerator, and more particularly to an absorption refrigerator in which a cooling water coil of an absorber and an evaporation coil of an evaporator are arranged in the same container.

[0002]

2. Description of the Related Art An absorption refrigerator has an evaporator for evaporating a liquid refrigerant on an outer surface of an evaporating coil, and a refrigerant vapor generated in the evaporator is absorbed into an absorbing solution (a concentrated solution having a high absorbent concentration) to generate the refrigerant. And an absorber configured to remove the absorbed heat by the cooling water flowing through the cooling water coil provided therein.

Conventionally, in an absorption refrigerator having such a configuration, both the evaporating coil and the cooling water coil of the absorber are formed by spirally wrapping a tube around a vertical axis, and the evaporating coil is formed. As shown in FIG. 3, the cooling water coil and the cooling water coil are arranged concentrically in a cylindrical body 8 having an axis perpendicular to the cooling water coil 4 of the absorber.
Therefore, the evaporating coil 3 whose temperature is lower than that of the cooling water coil 4 of the absorber is arranged closer to the body 8 of the absorption refrigerator. Further, an absorber ring tray 2 for spraying the concentrated solution on the cooling water coil has an evaporating coil 3 above the cooling water coil.
The evaporator ring tray 1 for spraying the liquid refrigerant is disposed above the evaporating coil in a horizontal annular groove. Therefore, the absorber ring tray 2 and the evaporator ring tray 1 are arranged concentrically with the absorber ring tray 2 on the inner peripheral side.

[0004] Both the absorber ring tray 2 and the evaporator ring tray 1 are filled with a concentrated solution or liquid refrigerant to a substantially uniform depth, and are filled with a cooling water coil or an evaporating coil from each part of the circumference thereof. It is designed to spray a concentrated solution or liquid refrigerant.

[0005]

Incidentally, the body 8 of the absorption refrigerator is adapted to be installed with its axis being vertical, so that the absorber ring tray 2 and the evaporator ring tray 1 are assembled at the assembly stage of the apparatus. Then, the cylinder 8 is assembled to the cylinder so that the axis is horizontal when the axis is vertical. However, in the actual installation of the absorption refrigerator, it is difficult to install the body 8 so that the axis is strictly vertical, and the absorber ring tray 2 is also required in the assembling stage.
It is difficult to fix the evaporator ring tray 1 so as to be strictly perpendicular to the axis of the body 8.

For this reason, when the body 8 is installed, the surface connecting the bottom surfaces of the above-described absorber ring tray 2 and evaporator ring tray 1 is inclined at a certain angle α with respect to the horizontal plane. When the surface connecting the bottom surfaces of the evaporator ring trays is inclined at an angle α, a difference in height occurs between the lower and lower bottom surfaces of the evaporator ring tray. When the difference is large, when the liquid refrigerant is supplied to the evaporator ring tray, the liquid refrigerant does not spread to a portion at a higher position of the evaporator ring tray, and the liquid refrigerant is not supplied to the evaporation coil from that portion, The evaporator coil will not be able to perform its planned capacity. The difference in height between the bottom surface on the lower side and the bottom surface on the higher side of the ring tray is proportional to the radius of the ring tray if the angle α is the same. The radius of the ring tray is substantially equal to the radius of the evaporating coil or the cooling water coil receiving the supply of liquid from the ring tray, and in the prior art in which the evaporating coil 3 is arranged on the outer peripheral side, the radius of the evaporator ring tray is also large. Become. Therefore, when the evaporator ring tray, that is, the refrigerator body is installed at a certain level, the distribution of the refrigerant from the evaporator ring tray to the evaporating coil is easily influenced by the level, and the evaporating capacity of each unit is reduced. This was causing the variation.

In the evaporator, since the refrigerant (water) evaporates at 5 ° C. on the evaporating coil during the cooling operation, the temperature of the body 8 is close to the temperature, and the operating temperature of the absorption refrigerator becomes Condensation forms on the outer circumference of the body and on the bottom of the body below the evaporator coil. Therefore, to prevent dew condensation, heat insulation material (cooling material) on the body
Had to be installed.

[0008] It is an object of the present invention to reduce the variation in performance of each absorption chiller and the cost.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-temperature regenerator, a separator, a low-temperature regenerator, a condenser, an evaporator having a refrigerant distributing means to an evaporator coil and an evaporator coil, and a cooling water coil. The absorption evaporator and the absorber are disposed inside a body arranged with their axes substantially perpendicular to each other, and the evaporator is connected to the center axis of the body. This is achieved by arranging an absorber on the outer peripheral side of the evaporator at a position close to the evaporator.

[0010] The above object is also achieved by a high-temperature regenerator, a separator,
An absorption refrigerator in which a refrigeration cycle is formed by connecting a low-temperature regenerator, a condenser, an evaporator coil, and an evaporator coil and distribution means for refrigerant to the evaporator coil, and an absorber having a cooling water coil therein, by piping. In addition, the present invention is also achieved by arranging the absorber concentrically inside the cylindrical body arranged with the axis substantially vertical, with the evaporator being on the inner peripheral side.

The evaporating coil and the cooling water coil are constituted by arranging a plurality of helical coils having different radii concentrically with their axes substantially perpendicular to each other. It is desirable to arrange concentrically inside.

[0012] The refrigerant is supplied dropwise from the refrigerant distribution means to the evaporating coil. The refrigerant distribution means is arranged above the evaporation coil and along the evaporation coil so that the refrigerant can be uniformly supplied to each position of the evaporation coil. When the evaporating coil is close to the center axis of the body, the refrigerant distribution means is also located near the center axis of the body. When the refrigerant distribution means is located near the center axis of the trunk,
If the verticality of the cylinder center axis when the absorption refrigerator is installed, in other words, the inclination of the refrigerant distribution means from the horizontal plane is the same, the amount of displacement of the refrigerant distribution means from the reference plane (horizontal plane) is as shown in FIG. As shown in (1), it is sufficient to reduce the dispersion of the refrigerant distribution to the evaporating coil. Therefore, the dispersion of the performance of each aircraft is also reduced.

[0013] In addition, the absorber is usually 40 to 5 when cooling.
Since the absorption solution (concentrated solution) at 0 ° C is distributed, if the evaporator is arranged on the inner side and the absorber is arranged on the outer side, that is, the side in contact with the inner peripheral surface of the barrel, the temperature of the barrel is almost the same. Temperature. Therefore, regardless of the operating atmosphere conditions of the absorption refrigerator, dew condensation outside the body is eliminated. Furthermore, the refrigerant that could not evaporate falls at the lower part of the evaporating coil, but the body bottom is inclined so that the center side is lower, so that the absorbing solution flows from the absorber side to the center side, that is, below the evaporating coil. Flows towards it. As a result, the temperature of the body bottom where the refrigerant falls is also close to the temperature of the absorbing solution, and dew condensation outside the body bottom is also eliminated.

Since there is no condensation on the outer peripheral surface of the trunk and the outer surface of the bottom of the trunk, it is not necessary to attach a heat insulating material (cooling material).

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a system diagram including a main configuration of an absorption refrigerator to which the present invention is applied. The illustrated absorption chiller / heater uses an absorbing solution in which lithium bromide (LiBr) as an absorbing agent absorbs water as a refrigerant as a working fluid. The LiBr concentration of the absorbing solution fluctuates as the working fluid circulates through the apparatus, and this fluctuation can be divided into approximately three stages. From the lower concentration level, they are called a dilute solution, an intermediate concentrated solution, and a concentrated solution. .

The illustrated absorption chiller / heater has a high-temperature regenerator 10 provided with means for heating an absorbing solution (dilute solution) contained therein,
A low-temperature regeneration device including a separator 16 disposed above the high-temperature regenerator 10 and connected to the high-temperature regenerator 10 by a riser 14, and a refrigerant vapor coil 23 having one end connected to a gas phase portion of the separator 16. And a condenser 26 in which a second refrigerant vapor pipe 28 is connected to the low temperature regenerator 22 and the other end of the refrigerant vapor coil 24 is connected and a cooling water coil 50 is provided.
An evaporator 34 connected to the condenser 26 by a liquid refrigerant pipe 30 interposed with a flow control valve 31 and having an evaporator coil 3 therein;
An absorber 44 which communicates with the evaporator 34 through an evaporating refrigerant vapor passage and in which the cooling water coil 4 is provided; and a solution circulation pump 54 whose suction side is connected to the bottom of the absorber 44 by a dilute solution suction pipe 52.
And a low-temperature solution heat exchanger 42 having the heated fluid inlet side connected to the discharge side of the solution circulation pump 54, and a heated fluid inlet side connected to the heated fluid outlet side of the low-temperature solution heat exchanger 42 to be heated. A high-temperature solution heat exchanger 36 having a fluid outlet side connected to a dilute solution inlet of the high-temperature regenerator 10;
The intermediate concentrated solution pipe 20 connecting the liquid phase of the high temperature solution heat exchanger 36 with the inlet of the heated fluid, and the intermediate concentrated solution pipe 3 connecting the heated fluid outlet side of the high temperature solution heat exchanger 36 and the low temperature regenerator 22
8, a concentrated solution pipe 40 connecting the bottom of the low-temperature regenerator 22 and the heating fluid inlet side of the low-temperature solution heat exchanger 42, and connecting the heating fluid outlet side of the low-temperature solution heat exchanger 42 and the top of the absorber 44. It comprises a concentrated solution pipe 41 and a cooling water pipe 48 connecting the outlet of the cooling water coil 4 and the inlet of the cooling water coil 50.

Since the present invention relates to an absorber and an evaporator, this part will be described. FIG. 1 shows a longitudinal section of a body of an absorption refrigerator to which the present invention is applied. The body 8 of the absorption refrigerator shown in the figure has a cylindrical outer wall 8a, a body bottom 8b closing the lower end thereof, a cylindrical inner peripheral wall 8d forming an inner peripheral side wall of the evaporator, and an evaporator and an absorber. And a cylindrical partition wall 8c that concentrically partitions the space between the inner wall 8d and the partition wall 8c, and the evaporator coil 3 is disposed between the inner peripheral wall 8d and the partition wall 8c to form the evaporator 34. The cooling water coil 4 is arranged between 8a and constitutes the absorber 44. That is, the evaporator is arranged at a position near the center axis of the body, and the absorber is arranged on the outer peripheral side of the evaporator. On the torso bottom surface 8b,
It is inclined so that the center side becomes lower. The torso 8
Inside, equipment other than the evaporator 34 and the absorber 44 is also provided, but the description is omitted because it is not directly related to the present invention.

The evaporating coil 3 is composed of five sets of helical coil tubes of different radii arranged concentrically with the axis substantially vertical, and the cooling water coil 4 is also concentric with the axis substantially vertical. It is composed of three sets of spiral coil tubes with different radii arranged. The evaporating coil 3 is disposed concentrically with the cooling water coil 4 inside the cooling water coil 4. Above the evaporator coil 3, five sets of annular grooved evaporator ring trays 1 are arranged as refrigerant distribution means at positions corresponding to the respective coils. Above the cooling water coil 4, the evaporator ring trays 1 also correspond to the respective coils. In this position, three sets of annular ring-shaped absorber ring trays 2 are arranged as concentrated solution distributing means.

The evaporator is on the inner peripheral side of the absorber, so that the radius of the evaporator ring tray 1 is smaller than when the evaporator is arranged on the outer peripheral side of the body. For this reason, even if the evaporator ring tray 1 is inclined from the reference plane (horizontal plane) due to an error in assembling the evaporator ring tray 1 to the barrel 8 or installing the barrel 8, if the inclination angle is the same, the evaporator The difference in the depth of the liquid refrigerant in each part of the ring tray 1 is smaller than that in the case where the evaporator is on the outer peripheral side of the absorber, and the uneven distribution of the liquid refrigerant from each part of the evaporator ring tray 1 to the evaporating coil is small. Is reduced. By reducing the non-uniformity of the distribution of the liquid refrigerant from each part of the evaporator ring tray 1, variations in the performance of the evaporator and, consequently, variations in the performance of each of the absorption refrigerators are reduced.

Further, in this embodiment, since the absorber is arranged on the outer peripheral side of the body, the radius of the evaporator ring tray 1 becomes smaller and the radius of the absorber ring tray 2 becomes larger. However, since the amount of liquid refrigerant supplied to the evaporating coil is usually 1/9 to 1/13 of the amount of concentrated solution supplied to the absorber, it is difficult to uniformly disperse the refrigerant on the evaporating coil. This is a more important point than the solution distribution of the absorber in exhibiting the performance of the refrigerator, and the effect of the height difference from the reference plane (horizontal plane) of each part of the absorber ring tray 2 on the performance is relatively small.

In the absorber, an absorption solution (concentrated solution) usually at 40 to 50 ° C. is distributed during cooling. In this embodiment, the evaporator is disposed inside the partition wall 8c, and the absorber is disposed outside the partition wall 8c, that is, on the side in contact with the inner peripheral surface of the outer peripheral wall 8a. Equivalent temperature. Therefore, regardless of the operating atmosphere conditions of the absorption refrigerator, dew condensation outside the body is eliminated. Further, the refrigerant that has not completely evaporated falls below the evaporating coil 3, but the bottom surface 8b is inclined so that the center side becomes lower, so that the absorbing solution flows from the absorber side to the center side, that is, the evaporating coil. It flows down. As a result, the temperature of the body bottom where the refrigerant falls is also close to the temperature of the absorbing solution, and dew condensation outside the body bottom is also eliminated.

Since there is no dew condensation on the outer peripheral surface of the trunk and the outer surface of the trunk bottom, it is not necessary to attach a heat insulating material (cooling material).

[0023]

According to the present invention, since the body wall temperature outside and below the evaporator and absorber is higher than when the evaporator is arranged outside, dew condensation on the body is eliminated, and the heat insulating (cooling) material is removed. No installation is required, and costs are reduced. In addition, the maximum distance of the evaporator ring tray from the center of the body can be reduced, and the installation error of the absorption refrigerator (including the assembly error) is compared with the conventional case where the evaporator is arranged outside the absorber. That is, if the inclination angle from the reference horizontal plane of the evaporator ring tray is the same, the dispersion of the distribution of the refrigerant from the evaporator ring tray to the evaporating coil becomes small, and the refrigeration capacity during production and installation is small and stable. Products can be manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram illustrating the principle of the present invention.

FIG. 3 is a cross-sectional view showing an example of the related art.

FIG. 4 is a system diagram showing a main configuration of an absorption refrigerator to which the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Evaporator ring tray 2 Absorber ring tray 3 Evaporation coil 4 Cooling water coil 5 Heat retaining (cooling) material 6 Liquid refrigerant 7 Absorbing solution 8 Body 8a Outer wall 8b Body bottom 8c Partition wall 8d Inner peripheral wall 10 High temperature regenerator 12 Heat source 14 riser 16 separator 18 refrigerant vapor pipe 20 middle concentrated solution pipe 22 low temperature regenerator 23 refrigerant vapor coil 24 condensed refrigerant vapor pipe 26 condenser 28 secondary refrigerant vapor pipe 30 liquid refrigerant pipe 31 flow control valve 34 evaporator 36 high temperature Solution heat exchanger 38 Intermediate concentrated solution pipe 40 Concentrated solution pipe 41 Concentrated solution pipe 42 Low temperature solution heat exchanger 44 Absorber 48 Cooling water pipe 50 Cooling water coil 52 Dilute solution suction pipe 54 Solution circulation pump

Claims (3)

[Claims] 1. A refrigeration system in which a high-temperature regenerator, a separator, a low-temperature regenerator, a condenser, an evaporator provided with an evaporator coil and a means for distributing refrigerant to the evaporator coil, and an absorber provided with a cooling water coil are connected by piping. In the absorption refrigerator that formed the cycle,
The evaporator and the absorber are arranged inside a body arranged with their axes substantially perpendicular to each other, and the evaporator is arranged at a position near the center axis of the body, and the absorber is arranged on the outer peripheral side of the evaporator. An absorption refrigerator characterized by being performed. 2. A refrigeration system in which a high-temperature regenerator, a separator, a low-temperature regenerator, a condenser, an evaporator provided with an evaporator coil and a means for distributing refrigerant to the evaporator coil, and an absorber provided with a cooling water coil are connected by piping. In the absorption refrigerator that formed the cycle,
An absorption refrigerator, wherein the evaporator and the absorber are arranged concentrically inside a cylindrical body arranged with the axis substantially vertical, with the absorber on the outer peripheral side. 3. The evaporating coil and the cooling water coil are configured by arranging a plurality of spiral coils having different radii and concentrically with their axes substantially perpendicular to each other. 3 is arranged concentrically on the inner side of the outer peripheral side.
2. The absorption refrigerator according to 1.