JPS58219369A - Absorption type refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerating machine, which comprises an evaporator, an absorber, a regenerator, a condenser, a heat exchanger, and pumps, and performs an absorption/refrigeration cycle. The present invention relates to an absorption refrigerator that effectively utilizes the difference.

As shown in FIG. 1, a conventional absorption refrigerating machine of this type includes absorbers 1a and 1b, evaporators 2a and 2b, a regenerator 3, and a condenser 4.
, heat exchanger 5 and pump 6a.

6b, the absorber 1a and the regenerator 3 are connected via a pump 5a, a heat exchanger 5, and a conduit 7a, and the regenerator 3 is connected to the spray pipe of the absorber 1b via a heat exchanger 5 and a conduit 8. 9, and the absorber 1b is connected via a pump 6b and a conduit 7b to the spray pipe 9a of the absorber 1a.

Further, the spray pipes 10 of the condenser 4 and the evaporators 2g and 2b are connected through a conduit 11. The absorber 1a.

1b tube groups 15a, 15b and evaporators 2a, 2
Cooling water 13 and cold water 12 are supplied to the tube groups 16a and 16b, respectively, as shown by arrows, and the water flow direction of both tube groups 12 and 13 is the same.

As mentioned above, in conventional refrigerators, the evaporator 2 on the cold water inlet side
The evaporation temperature of a increases, and the corresponding absorber 1a cools the solution with cooling water at a low temperature on the cooling water inlet side, so the absorption capacity is not high, and the solution concentration in equilibrium with this becomes thinner. However, on the contrary, the evaporation temperature of the evaporator 2b on the cold water outlet side is higher than the inlet temperature of the tube group 16b,
Even if the average temperature difference is the same, it will be lower than before the evaporator was divided into 28 and 2b, and the absorption capacity will be reduced. In particular, when the chilled water outlet temperature is lowered to 6C or less, if the heat transfer area of the evaporator 2b is kept within a practical range, the evaporation temperature of the evaporator 2b will drop to about 3C, which is significantly lower due to the physical properties of water, which is a refrigerant. had the disadvantage of reduced absorption capacity.

In view of the above, the present invention aims to improve the overall uniformity rate by effectively utilizing the average temperature difference between the absorber and the evaporator.

The evaporation temperature of the evaporator and the absorption liquid concentration of the absorber vary depending on the respective inlet temperatures even if the average temperature difference determined from the heat transfer area and the heat transfer coefficient is the same and the outlet temperature of the chilled water or cooling water is constant. That is, when the inlet temperature is high, the evaporation temperature increases, and conversely, when the inlet temperature is low, it decreases. Therefore, if the evaporator and absorber are divided into any number of sets and chilled water or cooling water is flowed straight through each set, there will be sections where the evaporation temperature is extremely low or sections where the absorption liquid temperature is high. Since the performance deteriorated in these categories, the overall performance improvement was small.

In view of the above, the present invention provides a method of flowing cold water or cooling water to an evaporator and an absorber divided into an arbitrary number of groups so as to prevent the occurrence of extremely low evaporation temperature and high absorption liquid temperature sections. This is an improvement.

An embodiment of the present invention will be described below with reference to the drawings. Second
Among the symbols shown in the figures, the same symbols as those shown in FIG. 1 indicate the same parts.

In FIG. 2, la and lb are absorbers divided by a partition wall 17, and each absorber 1a and lb are tubes 15a and 1
Each of them has a built-in group 5b.

2a and 2b are evaporators divided by a partition wall 17, and each evaporator 2a and 2b is a tube 16a@16b.

16b' group is built in.

6a transfers the absorbed liquid from the absorber 1a to the regenerator 3 via a conduit 7a.
6b is a pump that sprays the absorption liquid from the absorber 1b to the absorber 1a through the conduit 7b.

13 is the absorber 1a, 1b (Df tube 15a.

The cooling water is supplied to the group 15b, and as shown in the figure, it is introduced from the left into the absorber 1a on the left side, flows through the group of tubes 15a, and then is introduced into the absorber 1b on the right side, and flows through the group of tubes 15b. It is then flowed out to the right. 12 is the tube 16a, 16b, 16b' of the evaporator 2a, 2b.
As shown in the figure, Sarel cold water is introduced from the left into the left evaporator 2a, flows through the tube group 16a', is introduced into the left evaporator 2b, and is introduced into the tube group 16a'. It is introduced into the evaporator 2a again and flows through the tube group 16a. Then the right evaporator 2b
After flowing through the tube group 16b, it flows out to the right. Other structures are conventional (Figure 1)
Since it is the same as , the explanation will be omitted.

In this embodiment, as described above, each set of absorber 1a and evaporator 2a and absorber 1b and evaporator 2b provided on both sides of partition wall 17 independently performs absorption and evaporation functions, and also uses cooling water. 13 and the temperature of the cold water 12, each set of absorber and evaporator (1a.

2a, lb, and 2b) each have their own absorption and evaporation temperatures.

In other words, on the left side, the evaporator 2a on the side where the cold water temperature is high,
The absorbers 1a on the side where the temperature of the cooling water is lower work together to perform evaporation and absorption, resulting in high efficiency. On the other hand, on the right side, the tube group 16b on the side with a lower chilled water temperature and the tube group 1 on the side with a higher chilled water temperature.
6b' is appropriately distributed, so even though it is on the cold water outlet side, the evaporation temperature decreases little, and even if it performs evaporation absorption in combination with the absorber 1b on the side where the cooling water temperature is higher, the absorption Since the container 1b is arranged so that the highly concentrated solution returned from the regenerator 3 is dispersed, the efficiency of a general absorption refrigerator panel can be obtained.

FIG. 3 shows another embodiment of the present invention, in which the absorber 1a has a built-in tube group 15a, 15a/, and the absorber 1b has a built-in tube group 15b, 15a/
It has a built-in tube group of 15b'. The cooling water 13 enters the tube group 15a' of the absorber 1a, then enters the tube group 15b' of the absorber 1b, returns to the absorber 1a again, flows into the tube group 15a, and then flows into the absorber 1b. The liquid enters the tube group 15b and flows out in the direction of the arrow.

In this embodiment, the temperature of the absorption liquid in the absorbers 1a and 1b, which are divided into two, is different from that in the two tube groups provided in the same absorber, for example, 15
Absorber 1 can be selected arbitrarily depending on the distribution of b and 15b'.
The absorption capacity of a and 1b can be distributed in the most efficient manner.

In the above two embodiments, if the temperature difference between the entrances and exits of the cold water 12 is larger than the temperature difference between the entrances and exits of the cooling water 13, the system shown in FIG. If the problem is larger, the method shown in FIG. 2 can be selectively used, and the two embodiments described separately can exhibit the most effect.

FIG. 4 shows another embodiment of the invention, in which the cooling water 13 first flows into the tube group 15b of the absorber 1b and then flows through the tube group 15a of the absorber 1a. On the other hand, cold water 1
2 is distributed as explained in FIG. 2 above. In this way, chilled water and cooling water are distributed, and the highly concentrated absorption liquid concentrated in the regenerator 3 is sprayed on the absorber 1b, and the evaporated refrigerant is absorbed in the evaporator 2b, and becomes an intermediate concentration, which is absorbed by the pump 6b. Vessel 1a
It absorbs the refrigerant vapor in the evaporator 2a, where the part with the highest temperature of the cold water is flowing and has a high evaporation pressure, becomes a dilute solution, is sucked into the pump 6a, and is sent to the regenerator 3 through the conduit 7a. sent to.

In each of the above embodiments, the case where the absorber and evaporator are divided into two parts has been described, but the invention is not limited to this.
Of course, the same operation and effect can be obtained even in the case of division or more.

As described above, according to the present invention, the temperature difference between the cold water and the cooling water in the evaporator and absorber can be effectively utilized, and the overall efficiency can be improved.

[Brief explanation of the drawing]

Figure 1 is a system diagram of a conventional absorption refrigerator, and Figure 2 is a system diagram of a conventional absorption refrigerator. FIGS. 3 and 4 are system diagrams of one embodiment of the absorption refrigerator of the present invention, respectively. 1a, 1b...Absorber, 2a, 2b...Evaporator, 12Fig.

Claims (1)

[Claims] 1. In an absorption refrigerator in which an evaporator, an absorber, a regenerator, a condenser, a heat exchanger, and a pump are operatively connected, the evaporator and absorber are connected through a partition wall. The solution is divided into an arbitrary number of sets, each set of evaporators and absorbers performs evaporation and absorption independently, and the concentrated solution in the regenerator is sequentially introduced into each set of divided absorbers. At the same time, cold water at multiple temperature stages is passed through the evaporator in the same section, and the evaporation pressure is equal to the absorption liquid concentration in that section,
An absorption chiller characterized by being configured to have the most desirable relationship with respect to cooling water temperature. 2 Cooling water at multiple temperature levels is passed through absorbers in the same section, and the temperature of the absorbent is configured to have the most desirable relationship with the concentration of the absorbent in that section and the evaporation pressure. An absorption refrigerator according to claim 1. 3. Regarding the difference between the cold water temperature at the inlet and the outlet, and the difference in the cooling water temperature, whichever is larger, the inlet side corresponds to the section with the lowest absorption liquid concentration, and the patent claim is made regarding the way the water flows on the remaining side. 4. The combination of the section where the chilled water temperature is highest and the section where the chilled water temperature is not the lowest has the highest absorption liquid concentration. Claim 1 characterized in that the section is configured to have a low area.
Absorption chiller as described in section.