JPH0484076A - Absorption type freezer - Google Patents

Abstract

PURPOSE:To provide an absorption type freezer for increasing a condensing performance, keeping a high absorption performance and having a high coefficient of performance(COP) by a method wherein cooling water is branched into two flows, one of the flows is flowed to a condensor, the other flow is flowed to an absorption device, the absorption device is divided into two chambers, dense solution is flowed to an outlet of a flow passage of cooling water and lean solution can be dispersed at an inlet port. CONSTITUTION:A flow passage for a cooling water 7 is divided into two flow passages for cooling waters 7a and 7b. The cooling water 7a passes through a condensor 8 and the cooling water 7b passes through an absorption device 6. The cooling waters merge again at a downstream side. An inside part of the absorption device 6 having the cooling water 7b flowed therein is defined by a partition wall 23 into two chambers of an inlet chamber 21 and an outlet chamber 22. The inlet chamber 21 is provided with a group of cooling water inlet pipes and the outlet chamber 22 is provided with a group of cooling water outlet pipe 6a in such a way as the dilution 12 and dense solution 5 can be dispersed. The rich solution 5 is dispersed onto the group of cooling water outlet pipes 6a and diluted, thereafter become dilution 12 and are dispersed onto the group of cooling water side pipes 6b. One cooling water 7a is directly fed to the condensor 8, so that cooling water 7a of low temperature contributes to condensation and then COP is improved. At the absorption device 6, the cooling water is heat exchanged with the dense solution 5 at the group of pipes 6a of relative high temperature and it is further heat exchanged with dilution 12 at the group 6b of pipes of relative low temperature, resulting in that a high performance can be maintained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an absorption refrigerator, and more particularly to a cooling means thereof.

[Conventional technology]

FIG. 2 shows a schematic configuration of a conventional absorption refrigerator.

A dilute solution 3 is heated and concentrated by a heat source fluid 2 in a regenerator 1 to generate refrigerant vapor 4, and a concentrated solution 5 is sent to an absorber 6. After leaving the absorber 6, the cooling water 7 flows in series, such as to the condenser 8.

Refrigerant vapor 4 is cooled and liquefied in a condenser 8, heated by cold water 10 in an evaporator 9, evaporated, and then enters an absorber 6 where it is absorbed into a concentrated solution 5 cooled by cooling water 7. The concentrated solution 5 becomes a dilute solution 3 in the absorber 6 and returns to the regenerator 1 again. The cold water 10 absorbs the latent heat of vaporization of the refrigerant vapor 11, is cooled, and is used for cooling.

[Problem to be solved by the invention]

The above-mentioned conventional absorption refrigerator had the following problems to be solved.

That is, the lower the condensation temperature in the condenser 8, the better the coefficient of performance (hereinafter referred to as COP) of the absorption refrigerator.

The condensation temperature decreases as the outlet temperature of the cooling water 7 decreases,
In the conventional machine, the cooling water 7 enters the condenser 8 after exchanging heat with the absorber 6 and raising its temperature, so the cooling water outlet temperature becomes high and the temperature rises.
There was a problem that it was difficult to improve OP.

The relationship between the COP of the absorption refrigerator and the condensing temperature will be explained with reference to FIG. FIG. 3 is a cycle of an absorption refrigerator shown in a pressure-temperature diagram. The solid line shows the cycle of the conventional machine. L
, Xz indicate the concentration of a concentrated solution and a dilute solution, respectively.

It is an existing fact that COP improves as X = will improve.

To lower the cooling water temperature at the outlet of the condenser 8, the absorber 6
There is a method to flow cooling water in parallel to the condenser 8 and to make the difference in temperature at the outlet of the cooling water to the same value as before in each heat exchanger, but in this case, the total flow rate of the cooling water is larger than before. This poses a problem in terms of water and energy conservation.

[Means to solve the problem]

As a means for solving the above problems, the present invention provides a cooling water flow path that branches into an absorber and a condenser and allows cooling water to pass through them in parallel, and two chambers inside the cooling water flow path, one on the inlet side and the other on the outlet side. The condenser is divided into two sections, and each of the above chambers of the condenser is bent in the middle to form a cooling water flow path, with a dilute solution in the inlet side chamber and a concentrated solution in the outlet side chamber. It is an object of the present invention to provide an absorption refrigerating machine characterized by comprising a group of tubes that are respectively dispersed.

[Effect]

Since the present invention is configured as described above, it has the following effects.

Generally, in an absorption refrigerator, if the total heat exchange amount of the absorber and condenser is 1.0, the absorber has a heat exchange amount of 0.7, and the condenser has a heat exchange amount of 0.3. If the total heat exchange amount and cooling water flow rate remain the same as before, the temperature difference between the cooling water inlet and outlet ΔTo
is the same as before. Conventionally, as shown in Figure 2, the cooling water flows in series with the absorber and condenser, so the temperature difference between the cooling water and the outlet of the absorber and condenser is 0.7ΔT, respectively.
,,0.3ΔT0. On the other hand, if the cooling water flow rates entering the absorber and condenser respectively when flowing in parallel are WA, W, and the temperature difference between the water outlet and outlet is ΔTA, ΔT, then 0.7 0.3 10
"W・+W・-1=ΔT.

ΔTA ΔTc To make the cooling water condenser outlet temperature lower than the conventional value,
The cooling water inlet temperature must be ΔTc≦ΔTo, and ΔTA and ΔTc at this time are respectively ΔT A'+ΔTc
', then from the above formula, ΔTa'≧ΔT.

≧ΔTc'. (See Figure 3 for ΔT^' and ΔTc') Therefore, in the above configuration, the cooling water flow paths are branched and flowed in parallel,
Conventionally, the condensing temperature can be lowered by reducing the flow rate of cooling water to the absorber and increasing the flow rate of cooling water to the condenser.

In addition, in the absorber with the above configuration, the cooling water flow path is refracted to create two
By using two tube groups, even if the cooling water flow rate is reduced compared to the conventional example, the flow velocity in the tubes can be increased and heat transfer performance can be ensured. A highly concentrated solution is cooled by a group of cooling water pipes on the outlet side, which have a high temperature.
Similarly, in the chamber on the inlet side, performance can be maintained by cooling the dilute solution with a low absorption temperature through a group of cooling water pipes on the inlet side with a low temperature.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a schematic block diagram of an absorption refrigerator according to this embodiment, and the same components as those in FIG. 2 of the conventional example are given the same reference numerals and their explanations will be omitted.

In FIG. 1, the flow path of the cooling water 7 is 2 of the cooling water 7a7b.
The cooling water 7a passes through the condenser 8, the cooling water 7b passes through the absorber 6, and the flow paths are configured to be branched into two, and to join again downstream. That is, the cooling water 7 is branched and flows through the condenser 8 and the absorber 6 in parallel.

The interior of the absorber 6 through which the cooling water 7b flows is divided by a partition wall 23 into two chambers: a population chamber 21 and an outlet chamber 22.
1 includes a cooling water inlet side tube group 6 that bends the flow path of the cooling water 7b.
Similarly, in the outlet chamber 22, a cooling water outlet side tube group 6a is provided so as to be able to spray the dilute solution 12 and the concentrated solution 5, respectively.

In the absorber 6, the flow path of the cooling water 7b is divided into a cooling water outlet side tube group 6a and a cooling water inlet side tube group 6b in series, and the concentrated solution 5 first flows through the cooling water outlet side tube group 6a. sprinkled on top,
After being diluted, it becomes a dilute solution 12 and is sprayed onto the cooling water inlet side tube group 6b.

As described above, according to this embodiment, the cooling water 7 is branched and one of the cooling water 7a is sent directly to the condenser 8, so the temperature is lower than that of the cooling water that passes through the absorber 6 as in the conventional case. Cooling water 7a
contributes to condensation, improving COP.

In addition, in the absorber 6 to which the cooling water 7b whose water amount has been reduced due to branching is supplied, the cooling water 7b is supplied to two tube groups, a cooling water outlet side tube group 6a and a cooling water inlet side tube group 6b, which are connected in series. The concentrated solution 5, which has a high ability to absorb refrigerant vapor even at high temperatures, exchanges heat with the cooling water outlet side tube group 6a on the relatively high temperature side, and the dilute solution 12 exchanges heat with the cooling water inlet side tube group 6b on the relatively low temperature side. As a result, high performance is maintained.

FIG. 3 is a line drawing comparing the performance in each cycle of the above embodiment and the conventional example, where the dashed-dotted line is the cycle of the above embodiment and the solid line is the cycle of the conventional example.

In the figure, by setting ΔTc≦ΔTo, the condensation temperature decreases from the conventional Tc to Tc', the regeneration lid pressure decreases accordingly, the concentrated solution concentration shifts from the conventional X, to Xl', and XI 'X2>XI X2, the concentration increases, and the CoP of the absorption refrigerator improves. That is, it can be seen that the COP of the example is high.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

That is, since the cooling water is branched and one of the branches is flowed directly to the condenser, the cooling efficiency is good, and therefore the condensing performance is improved.

In addition, in order to flow the other branched cooling water into the absorber, the inside of the absorber is divided into two chambers, and the middle of the cooling water flow path is provided as a group of tubes in each chamber, and the outlet side (slipstream side) is Since a concentrated solution and a dilute solution can be sprayed on the inlet side (upstream side), high absorption performance is maintained compared to the conventional example even though the amount of cooling water is reduced.

As a result of the above, an absorption refrigerator with high COP can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an absorption refrigerator according to an embodiment of the present invention, FIG. 2 is a diagram of a conventional absorption refrigerator, and FIG. 3 is a diagram of a conventional absorption refrigerator.
The figure is a performance comparison diagram of a conventional absorption refrigerator cycle and the cycle of the above embodiment. 6... Absorber, 6a... Cooling water inlet side tube group, 6b... Cooling water outlet side tube group, 7.7a, 7b...
- Cooling water, 8... Condenser, 21... Inlet chamber, 22... Outlet chamber, 23... Partition wall. Agent: Patent Attorney Akigai Sakama, 2 people! :! R Procedural amendment (voluntary) September 4, 1990

Claims (1)

[Claims] A cooling water flow path that branches into an absorber and a condenser and passes the cooling water in parallel, a condenser whose interior is divided into two chambers, an inlet side and an outlet side, along the cooling water flow path, and the condenser. A cooling water flow path is formed by bending the cooling water in each of the chambers of the vessel, and a group of tubes are provided to spray a dilute solution in the chamber on the inlet side and a concentrated solution in the chamber on the outlet side. An absorption refrigerator that is characterized by