JP2520946B2 - Air-cooled absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a multi-stage air-cooled absorption refrigerating machine in which a plurality of evaporators and absorbers are combined.

<Prior Art> An air-cooled absorption type refrigerator that serves as an air-cooled absorption chiller-heater for extracting cold water is known, for example, from Japanese Patent Laid-Open No. 58-208559. In this system, a pair of evaporators and an absorber having vertical finned cooling pipes are arranged vertically, and a single cold water pipe for heat exchange is connected to the evaporator (a single unit ( It is a single stage) configuration.

<Problems to be Solved by the Invention> However, in this method, since the air-cooled absorber has a single stage,
It requires a large amount of cooling air. Also, since the temperature at the absorption start point (concentrated liquid at the inlet of the absorber) is low, it tends to approach the crystallization line (in the Duhring diagram) and crystallize when there are fluctuations such as rising at low outside air temperature. . That is to say, referring to the conventional single-stage During diagram (concentration-pressure curve of the lithium bromide solution) shown in Fig. 3, when the evaporation temperature of the evaporator is 6.5 ° C, the absorption liquid of 64% concentration is 50%. The absorption starts at 0 ° C, but since this 50 ° C point is close to the crystallization line, there is a drawback that it is easy to induce crystals due to fluctuations and the like.

In view of the above situation, the present invention has multiple combinations of absorbers and absorbers in multiple stages, and allows cooling air of low temperature to impinge on a place desired to be cooled at the lowest temperature, thereby improving the efficiency of outside air. It is an object of the present invention to provide an air-cooled absorption type refrigerator that eliminates the above drawbacks by taking the above flow.

<Means for Solving the Problems> The present invention relates to a multi-stage air-cooled absorption refrigerating machine in which a plurality of evaporators and a plurality of absorbers are respectively combined, and cooling air from the final stage absorber to the intermediate stage absorber. A plurality of absorbers are arranged so as to flow in series to the first-stage absorber (the absorber that guides the highest concentration of absorption liquid is called the first-stage absorber), and the cold water is evaporated in the first-stage. A cold water pipe is piped so that the water flows from the evaporator to the intermediate evaporator through the final evaporator.

<Operation> Due to the above-mentioned configuration, 64% concentrated liquid from the regenerator is first sprayed to the first stage absorber, and the refrigerant vapor evaporated in the first stage evaporator at the upper position is absorbed, This slightly diluted concentrated liquid is sprayed by the intermediate stage absorber located at the intermediate position to absorb the refrigerant vapor from the upper intermediate stage evaporator, and finally the thinnest absorbed liquid is guided to the final stage absorber and diluted from the lower end. Liquid (60
%) Back to the regenerator side. In this case, the cooling air (outside air) first cools the final stage absorber, then the intermediate stage absorber, and finally the hot cooling air is applied to the first stage absorber, which is the reverse of the flow of the absorbing liquid. . In addition, cold water (13
C.) is first led to the first-stage evaporator, and then flows to the final-stage evaporator and the intermediate-stage evaporator in this order, and becomes cold water of 7.degree. Further, the temperature at the absorption start point can be increased and can be separated from the crystallization line.

<Examples> Hereinafter, the present invention will be described with reference to the drawings of Examples.
It is as follows.

Reference numeral 1 is an air-cooled first-stage absorber with fins 3 in which a first-stage evaporator 2 is arranged in the upper part, and next to the first-stage absorber 1, an intermediate-stage evaporator 4 is arranged in the upper part as described above. A final-stage absorber 7 having an intermediate-stage absorber 5 at an intermediate position and having a final-stage evaporator 6 at the top so that the cooling air inlet is at the most windward side of the cooling air.
In addition, the cold water pipe 8 is configured as a continuous pipe passing from the first stage evaporator 2 to the final stage evaporator 6 and then to the intermediate stage evaporator 4. Further, a 64% concentrated liquid absorbent dispersion portion 9 is provided on the upper portion of the first stage absorber 1, and a next stage dispersion portion 11 connected to the pump 10 at the lower end thereof is provided on the intermediate stage absorber 5. A spraying part 13 connected to the pump 12 at the lower end is provided above the final stage absorber 7 on the windward side, and a pump 14 at the lower end of the final stage absorber 7 is provided.
To construct a circulation path that returns 60% of the dilute liquid to the regenerator.
In addition, 15, 16 and 17 are the first stage evaporator 2 branched from the refrigerant pipe 18.
And a spraying section for the intermediate evaporator 4 and the final evaporator 6. Reference numeral 19 is a cooling fan installed on the back of the first-stage absorber 1.

Explaining this action, first, the absorption is divided into three stages, and the air-cooled absorption refrigerating machine in which the absorption liquid temperature is arranged in the descending order from the absorption liquid temperature lower to the higher temperature is 64% from the regenerator (not shown).
The concentrated absorbing liquid is sprayed to the first-stage absorber 1 to absorb the refrigerant vapor from above to reach a 62.7% concentration, and this absorbing liquid is pumped up and guided to the intermediate-stage absorber 5 of the next stage, from above. Refrigerant vapor is absorbed to a concentration of 61.3%, and this absorbing liquid is pumped up again and sprayed in the final stage absorber 7 to absorb the refrigerant vapor from above and return it as a dilute liquid with a concentration of 60%. In this case, the cooling air (outside air) is first cooled from the final stage absorber 7 through the intermediate stage absorber 5 to the first stage absorber 1 sequentially. In addition, the cold water of 13 ° C is stored in the 1st stage evaporator 11
Cold water at 0 ℃, then led to the final stage evaporator 6, where 9 ℃
Cold water is passed through the intermediate stage evaporator 4 and cooled to obtain cold water at 7 ° C. That is, the part that does not absorb unless it is the lowest temperature is set as the windward, and the part that can absorb even at the highest temperature receives the last wind.

Now, the Duhring diagram (solution concentration-pressure curve) showing this absorber-evaporator relationship will be explained (second
(Refer to the figure), as is clear from this diagram, in the first stage absorber, the absorption liquid changes from 55 ° C to 52.5 ° C, in the intermediate stage absorber the absorption liquid changes from 47.5 ° C to 44.5 ° C, and the final stage absorption increases. In the container, the absorption liquid temperature changed from 47 ℃ to 44 ℃, and the absorption liquid temperature shifted to the high temperature side compared to the single-stage conventional type (50 ℃ for the single-stage type).
To 42 ° C). Also, the evaporation temperature of the first-stage evaporator is 10.5 ° C,
The final stage evaporator is 8.5 ° C, and the intermediate stage evaporator is 6.5 ° C. The cooling air inlet temperature of 35 ° C is heated to 43 ° C after three-stage cooling.

<Effects of the Invention> As described above, in the air-cooled absorption refrigerator of the present invention, a plurality of evaporators and a plurality of absorbers are provided, and cooling air is supplied from the final stage absorber to the intermediate stage absorber and the first stage absorber. Since the cooling water is made to flow through the first stage evaporator to the final stage evaporator and the intermediate stage evaporator, the cooling air amount can be reduced. An air-cooled absorption refrigerator can be used. Furthermore, compared to the conventional method, the air-cooling operation can be performed even at a high outside temperature, and the practical effect is large.
Furthermore, even if the outside air temperature decreases, the temperature of the absorbing liquid in the first-stage absorber is high, so there is no risk of causing crystals even if there is some fluctuation.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a schematic diagram,
FIG. 2 is a Dühring diagram of the same three-stage example, and FIG. 3 is a conventional single-stage Dühring diagram. 1 ... 1st stage absorber, 2 ... 1st stage evaporator, 4 ... intermediate stage evaporator, 5 ... intermediate stage absorber, 6 ... final stage evaporator,
7 ... Final stage absorber, 8 ... Cold water pipe, 9,11,13 ... Spraying part, 10,12,14 ... Pump, 15,16,17 ... Refrigerant spraying part, 18
…… Refrigerant pipe, 19 …… Cooling fan.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuito Kobayashi, 2-18 Keihan Hondori, Moriguchi City, Osaka Prefecture, Sanyo Electric Co., Ltd. Sanyo Electric Co., Ltd. (72) Inventor Takao Tanaka 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-1-285750 (JP, A) JP-A-62 -202972 (JP, A)

Claims (1)

(57) [Claims] 1. In a multi-stage air-cooled absorption refrigerating machine in which a plurality of evaporators and a plurality of absorbers are respectively combined, cooling air is passed from a final stage absorber to an intermediate stage absorber to a first stage absorber. A plurality of absorbers are arranged so as to flow in series with, and a cold water pipe is piped so that cold water flows from the first-stage evaporator to the final-stage evaporator to the intermediate-stage evaporator. Refrigerator.