JPH0833257B2 - 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 front cooling water flowing into the first absorber is provided.

(E) Action In the absorption refrigeration system of the present invention, the heat exchanger cools the liquid refrigerant flowing to the first evaporator with the cooling water immediately before entering the first absorber to lower the temperature level of the liquid refrigerant. Have an effect. 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 the absorption refrigerating device 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 is a trap. 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 evaporator E ₁ is formed in the same cylinder U _{1 as the} absorber A ₁ and has a liquid circulation line 12 having an evaporator pump 13 and a cooling water tube 11.
And a pipe 15 having an absorber pump 16 in which a cooling water tube 14 is also provided in the absorber A ₁ and a return pipe 18 via a solution heat exchanger H ₁ to the absorber A ₁ and a high temperature generator G. It is connected to ₁ . Further, the low temperature generator G ₂ is provided in the canister U so as to communicate with the condenser C _2, and the pipe 5 having the absorber pump 6 and the return pipe 8 are connected to the absorber A ₂ via the solution heat exchanger H _2. It is connected. The evaporator E ₂ is connected to the absorber A ₂ in the same cylinder.
The condenser C ₂ a pipe 10 provided in the U ₂ and the evaporator E ₂ Yes and is connected, is sprayed through a pipe 2 of the circulating pipe 2 Toko with absorber pump 3 to evaporator E ₂ An evaporator tube 1 for evaporating the refrigerant liquid is provided. And absorber
The dilute solution of 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 and concentrated. It becomes 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. Feeding a refrigerant vapor generated in the high temperature generator G ₁ in the following low temperature generator G ₂ by a pipe 21, is heated by in該器G _2, to release the refrigerant vapor from the diluted solution, the solution is concentrated by increasing concentrations The refrigerant vapor generated in the low temperature generator G ₂ while becoming a solution enters the condenser C ₂ and is cooled by the cooling water in the tube 9 to be condensed.
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. The concentrated solution discharged from the low-temperature generator G ₂ exchanges heat with the dilute solution in the solution heat exchanger H ₂ , enters the absorber A ₂ , and is sprayed on the heat transfer tubes 4 passing through the cooling water. 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. In the absorber A ₁ and the evaporator E ₁ , the same solution and refrigerant are circulated between the high temperature generator G ₁ and the same. A cooling water pipe 100 is connected to the cooling water tube 14, and a branch pipe 101 of this pipe is provided so as to penetrate the heat exchanger H ₃ .

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 is a Dühring diagram showing an example of a water [refrigerant] -lithium bromide aqueous solution [absorption liquid] absorption refrigeration cycle of the primary side absorption refrigerator B ₁ having a high temperature generator G ₁ . FIG. 3 is a Duhring line showing an example of an absorption refrigeration cycle of a trifluoroethanol [refrigerant] -N-methyl-2-prolidone [absorption liquid] system of a secondary side absorption refrigeration machine B ₂ having a low temperature generator G ₂ . It is a figure. 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]
Flows through the pipe 7 and flows into the heat exchanger H ₃ via the trap T, where it is cooled by the water of about 37 ° C. in the branch pipe 101 of the cooling water pipe 100 and is cooled to about 50 ° C. Heat exchanger H ₃
Out of and into the evaporator E ₁ .

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 of flowing into the evaporator E ₁ , and the water droplets A large amount is scattered in the body U 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.

In addition, when the difference between the saturated vapor pressure of the condensed refrigerant in the secondary absorption refrigerator B ₂ and the internal pressure of the evaporator is small and it is large in the primary absorption refrigerator B _{1 as} in the present device [second Figure and third
It is particularly useful to equip the primary side absorption refrigerator with the heat exchanger H ₃ .

In this device, the flow rate of the cooling water in the cooling water pipe 100 is about 160 times the flow rate of the refrigerant liquid in the heat exchanger H ₃ , and therefore this pipe is used as shown by the chain double-dashed line in FIG.
The temperature rise of the cooling water is slight even when passing through H ₃ , and the decrease in the suction capacity of the absorber A ₁ due to this temperature rise is negligible. Therefore, without providing the branch pipe 101, the pipe 100
After passing the cooling water of ( ₃₎ to the heat exchanger H ₃ , it may be made to flow to the absorber A ₁ .

(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. Bring 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 guided to the evaporator of the primary side absorption refrigerator to the secondary side absorption refrigerator 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. B ₁ …… Primary side absorption refrigerator, B 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 ...... Tube, 15,22 ......
Piping, 100 ... Cooling water piping, 101 ... Branch pipe.

Claims (1)

[Claims] 1. A primary so that refrigerant vapor from a generator of a primary side absorption refrigerator is guided to a generator of a secondary side absorption refrigerator and the refrigerant condensed by this generator is guided to an evaporator of the primary side absorption refrigerator. In an absorption refrigeration system configured by combining a primary side absorption refrigeration machine with a secondary side absorption refrigeration machine, in the middle of the refrigerant path from the generator of the secondary side absorption refrigeration machine to the evaporator of the primary side absorption refrigeration machine, the refrigerant of this path An absorption refrigerating device comprising: a heat exchanger for exchanging heat with cooling water having a lower temperature level or the same temperature level as the cooling water supplied to the absorber of the primary side absorption refrigerator.