JPH0833256B2 - Absorption refrigeration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention provides two absorption refrigerators so that latent heat of condensation of refrigerant vapor generated in one absorption refrigerator is used as a heat source for the other. The present invention relates to an improvement of an absorption refrigeration system configured in combination.

(B) Conventional Technology As the conventional technology of the absorption refrigeration apparatus configured as described above, a first evaporator, a first absorber, a first solution heat exchanger, a high temperature generator, a second evaporator, and a second evaporator. , A second solution heat exchanger, a low-temperature generator, and a second condenser, and introduces refrigerant vapor from the high-temperature generator to the low-temperature generator through piping, and condenses the refrigerant liquid in the low-temperature generator. There is a structure in which the pipe is guided to the first evaporator (see, for example, Japanese Patent Publication No. 52-6896).

(C) Problems to be Solved by the Invention In the above-mentioned conventional device, when the low-temperature generator is operated at a high-temperature level of, for example, about 100 ° C., the liquid refrigerant flowing from here to the first evaporator is 100%. Since the temperature becomes high near ℃, there is a problem that the liquid refrigerant is flashed violently in this evaporator and self-evaporates to cause a large heat loss.

In view of this problem, the present invention aims to reduce the heat loss of the absorption refrigerating apparatus having the above configuration.

(D) Means for Solving Problems As a means for solving the above problems, the present invention provides a means for solving the above problems, in the middle of a refrigerant pipe from the low temperature generator to the first evaporator of the absorption refrigeration system having the above structure, It is characterized in that a heat exchanger for exchanging heat between the liquid refrigerant and the absorbing liquid flowing from the first absorber to the high temperature generator is provided.

(E) Action In the absorption refrigeration system of the present invention, the heat exchanger reduces the temperature level of the liquid refrigerant flowing to the first evaporator by cooling it with the absorbing liquid from the first absorber. Have. As a result, the flash of the liquid refrigerant flowing into the first evaporator is alleviated, and the heat loss accompanying it is reduced, so the thermal efficiency of the absorption refrigeration system of the present invention is improved compared to the conventional one.

(F) Embodiments The present invention will be described with reference to the drawings with reference to the drawings. An evaporator E ₂ , an absorber A ₂ , a low temperature generator G ₂ , a high temperature generator G ₁ , a condenser C ₂ and a solution heat exchanger. In an absorption refrigerating apparatus consisting of H ₂ and H ₁ , an evaporator E ₁ and an absorber A ₁ are provided, the high temperature generator G ₁ and the low temperature generator G ₂ are connected by a pipe 21, and the pipe 21 traps. Connected to the evaporator E ₁ via a pipe 22 with T,
The refrigerant vapor is guided from the high temperature generator G ₁ to the low temperature generator G ₂ , and the refrigerant liquid condensed by the low temperature generator is guided to the evaporator E ₁ via the heat exchanger H ₃ . This condenser E ₁ is the same as the absorber A _1.
Liquid circulation line 12 formed in AE ₁ and having an evaporator pump 13
And a cooled water tube 11, and also a cooling water tube 14 is provided in the absorber A ₁ and a pipe 15 having an absorber pump 16 and a return pipe 18 are passed through the solution heat exchanger H ₁ and the absorber A.
₁ and the high temperature generator G ₁ are connected. Further, the low temperature generator G ₂ is provided in the canister GC ₂ in communication with the condenser C _2, and returns to the pipe 5 having the absorber pump 6 and the return pipe 8 through the solution heat exchanger H ₂ and the absorber A ₂ Connected to. The evaporator E ₂ is connected to the absorber A ₂ and a pipe 10 provided on the same cylinder AE ₂
In the condenser C ₂ and the evaporator E ₂ and is Yes linked, the evaporator tubes in the evaporator E ₂ for evaporating the refrigerant liquid to be sprayed by the pipes 2 of the circulation pipe 2 Toko with evaporator pump 3 1
Is provided. And the dilute solution of the absorber A ₁ is sent to the high temperature generator G ₁ via the heat exchanger H ₃ and the solution heat exchanger H ₁ by the absorber pump 16, where it is heated to a high temperature to release the refrigerant vapor, Concentrate to an intermediate solution. The solution enters the solution heat exchanger H _1, the temperature is lowered by heat exchange with the diluted solution from the absorber A _1, it enters the absorber A _1. Next with high temperature generator
The refrigerant vapor generated in G ₁ is sent to the low temperature generator G ₂ via pipe 21,
It is heated in the vessel G ₂ to release the refrigerant vapor from the dilute solution, the solution increasing in concentration into a concentrated solution while the low temperature generator
The refrigerant vapor generated in G ₂ enters the condenser C ₂ and is cooled and condensed by the cooling water in the tube 9. The refrigerant vapor generated in the high temperature generator G ₁ is also condensed in the tube 7 by heat exchange with the solution in the low temperature generator G ₂ , and enters the evaporator E ₁ via the refrigerant trap T and the heat exchanger H ₃ . The refrigerant accumulated in the condenser C ₂ returns to the evaporator E ₂ via the condensate return pipe 10. Low temperature generator G ₂
The concentrated solution that has exited is heat-exchanged with the dilute solution by the solution heat exchanger H ₂ , enters the absorber A ₂ , and is sprayed onto the heat transfer tubes 4 that pass cooling water inside. The sprayed concentrated solution is cooled by cooling water and absorbs the refrigerant vapor evaporated in the evaporator E ₂ to become a diluted solution. In the evaporator E ₂ , the cold water loses heat due to the evaporation of the refrigerant and becomes cold. Absorber A ₁ and evaporator E ₁
In the same manner, the similar solution and refrigerant are circulated between the high temperature generator G ₁ and the high temperature generator G ₁ .

As described above, in the absorption refrigerating apparatus of the present invention [hereinafter referred to as the present apparatus], two independent cycles of the refrigerant and the absorbing liquid can be formed, and the absorption refrigerating action is exhibited. Specific examples of these cycles are shown in FIGS. 2 and 3.

FIG. 2 shows a primary side absorption refrigerator Ab ₁ having a high temperature generator G ₁ .
Water [refrigerant] -lithium bromide aqueous solution [absorption liquid] is a Duhring diagram showing an example of an absorption refrigeration cycle of the system,
FIG. 3 is a Duering showing an example of an absorption refrigeration cycle of a trifluoroethanol [refrigerant] -N-methyl-2-pyrrolidone [absorption liquid] system of a secondary absorption refrigerator Ab ₂ having a low temperature generator G ₂ . It is a diagram. Further, FIG. 4 is an explanatory view showing an example of temperature conditions of cold water and cooling water of the present apparatus in these cycles in a table.

Next, the operation of the heat exchanger H ₃ of this device will be described. Refrigerant drain of about 98 ℃ condensed in the heater of the low temperature generator G ₂ [water]
Is due to the absorption liquid of about 41 ° C. to 44 ° C. which flows into the heat exchanger H ₃ via the trap T through the pipe 7 and flows from the absorber A ₁ to the heat exchanger H ₃ through the pipe 15 here. While cooling, the temperature drops to about 50 ° C, flows out from the heat exchanger H ₃ , and evaporates E ₁
Flows into. On the other hand, in the conventional device that does not include the heat exchanger H ₃ , the refrigerant drain [water] at about 98 ° C. flows into the evaporator E ₁ . The drain [water] has a saturated vapor pressure three times or more as large as that at about 50 ° C., and flashes while vigorously self-evaporating at the moment when it flows into the evaporator E ₁ , and the water droplets A large amount is scattered in the body AE ₁ . For this reason, in the conventional device, a large amount of the refrigerant liquid mixes in the absorbing liquid and is not useful for the refrigerating action, so that a large heat loss occurs.

In contrast, in the present apparatus, cooling refrigerant fluid evaporator E ₁
As compared with the conventional device, the flash of the refrigerant liquid is alleviated and the heat loss is reduced. By the way, the heat loss reduction effect is about 48 Kcal per kg of refrigerant.

When the difference between the saturated vapor pressure of the condensed refrigerant in the secondary absorption refrigerator Ab ₂ and the internal pressure of the evaporator is small and the primary absorption refrigerator Ab ₁ has a large difference as in the present device [second see Figure and Figure 3] be provided with a heat exchanger H ₃ to the primary side absorption refrigerating machine is particularly useful.

In the present device, the flow rate of the absorbing liquid with respect to the flow rate of the refrigerant liquid in the heat exchanger H ₃ is about 15.5 times, and the temperature rise of the absorbing liquid flowing out of this heat exchanger is slight, so that the temperature rise The decrease in the heat exchange rate of the heat exchanger H ₁ is extremely small, and the heat loss due to this is negligibly small. Therefore, when the heat exchanger H ₃ is provided on the outlet side of the pipe 15 on the outlet side of the heat exchanger H ₁ , the degree of reduction of heat loss of the present apparatus, in other words, the degree of improvement of the thermal efficiency is large.

(G) Effect of the Invention As described above, the present invention provides the device with the effect of mitigating the flash of the refrigerant liquid in the evaporator of the primary side absorption refrigerator of the absorption refrigeration apparatus to reduce the heat loss accompanying the flash. Leading the refrigerant vapor from the generator of the primary side absorption refrigerator to that of the secondary side, so that the refrigerant condensed here is led to the evaporator of the primary side absorption refrigerator and the absorption refrigerator on the secondary side. As compared with the conventional absorption refrigeration system configured by combining them, it has high practical value as a device capable of improving its thermal efficiency.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view showing an embodiment of an absorption refrigeration system according to the present invention, and FIG. 2 is a Duhring line showing an example of a cycle of a primary side absorption refrigeration machine in the embodiment shown in FIG. FIG. 3 and FIG. 3 are Duering diagrams showing an example of a cycle of the secondary absorption refrigerator, and FIG.
It is explanatory drawing which showed an example of the cold water and the temperature condition of cooling water in the Example of a figure. Ab ₁ … Primary side absorption refrigerator, Ab ₂ … Secondary side absorption refrigerator, E ₁ ,
E ₂ ... evaporator, A ₁ , A ₂ ... absorber, C ₂ ... condenser, G ₁ ... high temperature generator, G ₂ ... low temperature generator, H ₁ , H ₂ ... solution heat exchanger, H ₃ ... heat Exchanger, 7 ... Piping, 15 ... Piping.

Claims (1)

[Claims] 1. A primary so that refrigerant vapor from a generator of a primary absorption refrigerator is guided to a generator of a secondary absorption refrigerator, and refrigerant condensed by this generator is guided to an evaporator of a primary absorption refrigerator. In an absorption refrigeration system configured by combining a primary side absorption refrigerating machine with a secondary side absorption refrigerating machine, in the middle of the refrigerant path from the generator of the secondary side absorption refrigerating machine to the evaporator of the primary side absorption refrigerating machine, the refrigerant of this path An absorption refrigerating device comprising: a heat exchanger for exchanging heat with the absorbing liquid flowing from the absorber of the primary side absorption refrigerator to the generator.