JPH0829015A - Absorptive cooling and heating apparatus - Google Patents

Abstract

PURPOSE:To reduce the pressure loss in a lower barrel, reduce a dry region and prevent bypass of flowing-down solution in an absorptive cooling and heating apparatus by a method wherein there is provided a region having no tube expanding in a horizontal direction in a group of upper tubes and a group of lower tubes of each of an absorbing device and an evaporator, respectively. CONSTITUTION:A mixed solution feeding part 7 and a tray 8 having many holes at its bottom surface are arranged above a group 5 of upper tubes of an absorbing device 4. There is also provided a dilute solution reservoir 9 below a group 6 of lower tubes of the absorbing device 4 and a cold water spray device 14 is arranged above a group 11 of the upper tubes of an evaporator 10, and then they are installed in a lower barrel 1. In addition, a region A having no tube expanding in a horizontal direction is provided in groups 5, 11 of the upper tubes and groups 6, 12 of lower tubes of each of the absorbing device 4 and the evaporator 10, respectively. With such an arrangement as mentioned above, it is possible to reduce a pressure loss in the lower barrel 1, reduce a drying region and to prevent bypassing of flowing-down solution of an absorptive cooling and heating machine, and further improve its performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption cooling / heating machine.

[0002]

2. Description of the Related Art In the lower body of an absorption air conditioner,
The mixed solution pumped up by a solution pump is sprayed on the outer surface of the absorber tube of the absorber, and the refrigerant vapor from the evaporator is continuously absorbed by this solution to form a dilute solution.
In the evaporator, the outer surface of the evaporator tube is
The refrigerant (water) drawn up by the refrigerant pump is scattered and the latent heat of vaporization is taken from the cold water flowing in the pipe to evaporate and vaporize.

FIG. 5 is a vertical sectional view of a lower body of a conventional absorption cooling and heating machine. In the figure, an absorber 4 and an evaporator 10 are built in the lower body 1, and both units are separated by an eliminator 2 and a louver 3. An inlet 7 for the mixed solution is provided on the upper part of the absorber 4, and a tray 8 having a myriad of holes on the bottom is installed immediately below the inlet 7. Immediately below the tray 8, an absorber upper tube group 5 and an absorber lower tube group 6 are doubly stacked, and a tube-free region A extending in the horizontal direction is formed between them. A dilute solution reservoir 9 is provided below the absorber lower tube group 6.
An evaporative spray mother pipe 13 is installed on the upper portion of the evaporator 10, and a cold water spray 14 is attached to the mother pipe 13. Immediately below the cold water spray 14, an evaporator upper tube group 11 and an evaporator lower tube group 12 are provided in two layers, and a tube-free region A extending horizontally is formed between them.

[0004]

[Problems to be Solved by the Invention]

(1) In the absorber and the evaporator having the above-described structures, the tube group becomes large as the size of the device increases. Along with that, the pressure loss of the tube group increases and the performance of the absorption cooling / heating machine deteriorates. FIG. 6 is a diagram showing the flow of steam in a conventional device,
The vapor flow V tends to pass through the low resistance tube-free region A. By the way, the pressure loss of the conventional absorber and evaporator is about 2 mmHg, and this pressure loss is reduced by 5 to 6% of the performance of the absorption cooling and heating machine.

(2) FIG. 7 is a diagram showing a vapor flow in the absorber having the above-mentioned structure. Due to the vapor flow V flowing from the evaporator, the mixed solution W sprayed from the upper tray is pushed down by the vapor flow velocity as it goes under the tube, and a dry region D where the mixed solution does not flow down is generated. Therefore, the portion of the absorber tube where the mixed solution does not flow down does not dilute the solution and does not exhibit the function of the absorber. This is one of the causes of the deterioration of the performance of the absorber.

(3) In the absorber having the above-mentioned structure, the mixed solution sprayed from the tray flows on the surface of the circular pipe separately on both sides so as to surround the circular pipe, and joins at the lower part of the pipe. , It becomes a dilute solution while flowing down to the next tube and absorbing vapor. However, the solution on the surface of the pipe may be scattered from the pipe side depending on the condition of the flow and may not flow down along the surface of the pipe, but may drop directly into the dilute solution pool and may not effectively contribute to the absorption function. It is causing the decline.

The present invention solves the above-mentioned drawbacks of the prior art, and (1) reduces pressure loss in the lower body of an absorption cooling / heating machine (2) reduces the dry area (3) prevents bypass of the flowing solution. Therefore, it is intended to improve the performance of the absorption cooling and heating machine.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems and is provided above an absorber and an evaporator, and an upper pipe group of an absorber, each of which is composed of an upper tube group and a lower tube group. A tray with multiple holes in the mixed solution inlet and bottom, a dilute solution reservoir below the lower tube group of the absorber, and a cold water spray device above the tube group of the evaporator are installed in the lower body. An absorption cooling / heating machine having the following features. (1) A region without tubes extending horizontally is provided in each of the upper tube group and the lower tube group of the absorber and the evaporator. (2) An intermediate tray having a large number of holes on the bottom surface is provided in a region where there is no tube extending horizontally between the upper tube group and the lower tube group of the absorber. (3) A plurality of liquid bypass prevention plates inclined to return the solution scattered to the outside of the tube group of the absorber to the tube group were attached to the side parts of the tube group of the absorber.

[0009]

In the invention of the above item (1), the pressure loss is reduced by providing a region without tubes extending horizontally in the upper tube group and the lower tube group of the absorber and the evaporator, respectively. The performance of the machine is improved.

In the invention of the above item (2), an intermediate tray having a large number of holes on the bottom surface is provided in a region where there is no tube extending horizontally between the upper tube group and the lower tube group of the absorber. Again, since the flow of the liquid is made uniform, the dry area in the lower tube group is reduced, and the performance of the absorption cooling / heating machine is improved.

In the invention of the above item (3), the liquid bypass prevention plate inclined so as to return the solution scattered to the outside of the side of the tube group of the absorber to the tube group is provided on the side of the tube group of the absorber. By installing multiple sheets in the section, it is possible to prevent a pipe bypass of the flowing-down solution and improve the performance of the absorption cooling / heating machine.

[0012]

1 is a vertical sectional view of a lower body of an absorption cooling / heating machine according to a first embodiment of the present invention. In the figure, in the tube groups 5 and 6 of the absorber and in the tube groups 11 and 12 of the evaporator,
An additional region B without the tube extending horizontally is provided. At the same time, although not shown in the figure, the tubes of each of the tube groups 5, 6, 11 and 12 are increased in number in the horizontal direction and the height direction so that the surface areas are the same. The configuration other than the above is the same as the conventional technique.

The arrows in the figure show the flow of vapor in the absorber and the evaporator. The vapor flows through the low resistance tube-free regions A and B and returns to return to the tube group for efficient vaporization and absorption, while reducing the pressure loss between the two devices.

According to the absorber and the evaporator of this embodiment,
It is possible to prevent the performance of the absorption cooling / heating machine from being deteriorated without being affected by the pressure loss due to the increase in the size of the tube group, which has been a problem so far.

FIG. 2 is a vertical sectional view of a lower body of an absorption cooling / heating machine according to a second embodiment of the present invention. In the figure, 8 is a tray that has been conventionally provided. Reference numeral 15 denotes an intermediate tray newly provided in a tube-free portion between the absorber upper tube group 5 and the absorber lower tube group 6. Each of these trays has innumerable holes on the bottom surface, and the mixed solution is uniformly dropped downward. The mixed solution sprayed from the upper tray 8 is biased while flowing down the tube group 5 of the first layer, but is collected in the intermediate tray 15 provided between the tube groups 5 and 6, and the tray 15 has two stages. When sprayed on the eye tube group 6, it is sprayed uniformly. As a result, the mixed solution flowing down in the lower tube group 6 is not affected by the vapor flow at the flow start position, so that the receding of the dry region D in the lower tube group 6 is suppressed to a minimum.

According to the absorber with the intermediate tray of this embodiment, the backward movement of the mixed solution flowing down from the tray is reduced due to the influence of the vapor flow of the evaporator, and the dry area of the tube can be minimized. It is possible to minimize the performance degradation of the absorber.

FIG. 3 is a vertical sectional view of a lower body of an absorption cooling / heating machine according to a third embodiment of the present invention. In the figure, a plurality of liquid bypass prevention plates 16 are attached to both side surfaces in the tube direction of the tube groups 5 and 6 of the absorber 4. The configuration other than the above is the same as the conventional technique.

The mixed solution W flows down from the tray 8 in the direction of the arrow and travels down the tube groups 5 and 6. However, in the conventional apparatus, the mixed solution W is scattered away from the side part of the tube group and travels down the tube side. There is a case where the gas bypasses without any action and falls directly into the dilute solution reservoir 9, which causes the performance of the absorber 4 to deteriorate. The liquid bypass prevention plate 16 of this embodiment has a function of properly collecting the mixed liquid to be bypassed and returning it to the tube groups 5 and 6 again.

Liquid bypass prevention plate 16 of the absorber of this embodiment
According to the method, the mixed solution returns to the original state even if it is scattered from the surface of the tube while flowing down on the surface of the tube, so that the absorbing function is not impaired and the absorber performance can be maintained.

FIG. 4 is a vertical sectional view of a lower body of an absorption cooling / heating machine according to a fourth embodiment of the present invention. The present embodiment shows an example in which all of the above-mentioned first, second and third embodiments are incorporated and improved comprehensively. That is, (1) In each tube group of the absorber and the evaporator, there is provided a region B without a tube that spreads in the horizontal direction. (2) An intermediate tray 15 having innumerable holes on the bottom surface is provided between the upper tube group 5 and the lower tube group 6 of the absorber. (3) A liquid bypass prevention plate 16 is provided on the side of the tube group of the absorber.

By the above-mentioned improvements of the respective parts, the present embodiment can achieve the overall performance improvement.

[0022]

In the absorption cooling / heating machine of the present invention, the following are provided and, if necessary, provided in combination, the performance is improved. (1) Horizontal tube-free regions provided in the upper tube group and the lower tube group of the absorber and the evaporator, respectively. (2) An intermediate tray having a large number of holes on the bottom surface provided in an area where there is no tube extending horizontally between the upper tube group and the lower tube group of the absorber. (3) A liquid bypass prevention plate that is inclined to return the solution scattered to the outside of the side of the tube group of the absorber to the tube group.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a lower body of an absorption cooling / heating machine according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a lower body of an absorption cooling / heating machine according to a second embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a lower body of an absorption cooling / heating machine according to a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a lower body of an absorption cooling / heating machine according to a fourth embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a lower body of a conventional absorption cooling and heating machine.

FIG. 6 is a diagram showing a vapor flow in the conventional example.

FIG. 7 is a diagram showing a distribution in a dry region in the conventional example.

[Explanation of symbols]

 1 Lower Body 2 Eliminator 3 Looper 4 Absorber 5 Absorber Upper Tube Group 6 Absorber Lower Tube Group 7 Mixed Solution Introducing Area 8 Tray 9 Dilute Solution Pool 10 Evaporator 11 Evaporator Upper Tube Group 12 Evaporator Lower Tube Group 13 Evaporation Spraying mother tube 14 Cold water spray 15 Intermediate tray 16 Liquid bypass prevention plate A Tube-free area B Added tube-free area D Dry area V Steam flow W Mixed solution

Claims (3)

[Claims] 1. An absorber and an evaporator each comprising an upper tube group and a lower tube group, a mixed solution introducing portion provided above the upper tube group of the absorber and a tray having a large number of holes in the bottom, and an absorber. In an absorption cooling / heating machine having a dilute solution pool provided below the lower tube group and a cold water spray device provided above the tube group of the evaporator in the lower fuselage, An absorption cooling / heating machine characterized in that a region without tubes extending horizontally is provided in each of the upper pipe group and the lower pipe group. 2. An absorber and an evaporator each comprising an upper tube group and a lower tube group, a mixed solution introducing portion provided above the upper tube group of the absorber and a tray having a large number of holes on the bottom surface, and an absorber. In an absorption cooling and heating machine having a dilute solution pool provided below the lower tube group and a cold water spray device provided above the tube group of the evaporator in the lower body, the upper tube group of the absorber An absorption cooling / heating machine characterized in that an intermediate tray having a large number of holes on the bottom surface is provided in a region where there is no tube extending horizontally between the lower tube group and the lower tube group. 3. An absorber and an evaporator each consisting of an upper tube group and a lower tube group, a mixed solution introducing portion provided above the upper tube group of the absorber, a tray having a large number of holes in the bottom, and an absorber. In the absorption cooling and heating machine configured by providing the dilute solution pool provided below the lower tube group and the cold water spray device provided above the tube group of the evaporator in the lower fuselage, An absorption cooling and heating machine characterized in that a plurality of liquid bypass prevention plates inclined to return the solution scattered to the outside of the side to the tube group are attached to the side of the tube group of the absorber.