JPS6144263A - Air-cooling absorption type water chiller - 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] [Field of Application of the Invention] The present invention relates to an air-cooled absorption type water chiller/heater. Regarding the configuration of the evaporator and air-cooled absorber.

[Background of the invention]

The conventional air-cooled absorption water chiller is disclosed in Japanese Patent Application Laid-Open No. 58-208559.
As described in this issue, the refrigerant vapor evaporated in the evaporator flows from the top of the evaporator through the vapor pipe into the absorber. In this case, the volumetric flow rate of the refrigerant vapor is extremely large. Therefore, there has been a problem in that it is extremely difficult to flow low-pressure refrigerant vapor into a small passage area within the pipe, especially in the steam pipe.

Additionally, a means to increase the amount of heat dissipated by the air-cooled absorber was also required.

[Purpose of the invention]

The object of the invention is to cool the absorber and condenser with outdoor air. Our goal is to provide absorption water coolers.

[Summary of the invention]

In order to realize an air-cooled absorber, the present invention uses a liquid refrigerant that has been supercooled in a condenser to cool the absorption solution and absorb the absorption heat. Must be installed inside the pipe.

The refrigerant vapor passage is formed next to the evaporator, and is connected to the air cooling section 9, and the air cooling section is provided with a counterflow flow between the cycle system and the cooling air.

[Embodiments of the invention]

An embodiment of the present invention will be explained with reference to FIG. The absorption type water chiller/heater 1 includes a high temperature regenerator 2. Low temperature regenerator 6° condenser 4. Evaporator 5. Absorber 6. Solution heat exchanger 7° burner 9. Solution pump 10. It is composed of a refrigerant pump 12. The lithium bromide aqueous solution in the high temperature regenerator 2 is heated by the burner 9 to generate refrigerant vapor and the solution is concentrated. The generated refrigerant vapor flows into the heating tube 14 of the low temperature regenerator 5 through the refrigerant line 15. The lithium bromide aqueous solution in the low-temperature regenerator 3 is heated by the refrigerant vapor in the heating tube 14, and refrigerant vapor is also generated here. Here, the refrigerant in the heating tube 14 is liquefied,
The lithium bromide aqueous solution is concentrated.

The refrigerant vapor generated in the low temperature regenerator 6 enters the condenser 4 through the refrigerant flow path 15, while the liquefied refrigerant.

It flows into the evaporator 5 from the refrigerant line 21 through the refrigerant line 16 . The condenser 4 has fins 18 outside the pipe, and the fan 19 causes outdoor air to flow through the fins 18, so that the refrigerant vapor in the condenser 4 is cooled and liquefied. Since the condenser 4 has a sufficient heat transfer area, the liquid refrigerant is supercooled. This supercooled refrigerant enters the heat exchanger 68 at the upper part of the absorber B from the refrigerant line 17, cools the absorption solution and absorbs the absorbed heat, and passes through the refrigerant line 69.

The refrigerant line 21 joins the refrigerant lines 16 and 26 and flows into the evaporator 5 from the refrigerant line 21.

There is a cold water pipe 22 inside the evaporator 5, and the liquid refrigerant is sprayed onto the cold water pipe 22 from the sprayer 25.Since the inside of the evaporator 5 is kept under reduced pressure, the liquid refrigerant evaporates and its latent heat is released. from the cold water in the cold water pipe. The liquid refrigerant that has not completely evaporated accumulates in the refrigerant reservoir 24 and flows into the refrigerant line 25. The refrigerant pump 12° passes through the refrigerant line 26 and returns to the spargeer 2.
Returning to step '5, the evaporated refrigerant vapor enters the absorber 6 through the refrigerant flow path 48.

・ [3) ・ The absorber 6 is composed of a vertical tube 28 and fins 29 located outside the tube. A sprayer 50 is provided at the top of the vertical pipe 28, and the concentrated solution that has passed through the concentrated solution line from the concentrated solution pump 11 is sprayed from the sprayer 50. The sprayed concentrated solution exchanges heat with supercooled refrigerant between heat exchangers to increase absorption capacity. Further, while exchanging heat in the heat exchanger 68, the concentrated solution absorbs a portion of the refrigerant vapor that has passed through the refrigerant flow path 48 from the evaporator 5, and also releases the absorbed heat to the supercooled refrigerant. The concentrated solution flowing out of the heat exchanger 68 is cooled by the outdoor air flowing outside the tube while flowing down along the wall of the vertical tube 2, and its water vapor pressure decreases. There, the refrigerant vapor from the evaporator 5 is absorbed to become a dilute solution, which is sucked into the dilute solution pump 10.

Around the absorber 6 is a duct 52, which encloses the absorber 6 and the evaporator 5 and becomes the suction duct for the fan 20. An air passage 54 is formed between the absorber vertical pipe 28 and the duct 52, and the rotation of the fan 20 generates an upward wind in the air passage 54.

This wind causes the absorber fins 29 and vertical pipes 28 (
4)・ is cooled. Moreover, the air flowing through the air passage 54 is as follows.

As outdoor air is sucked in through the intake port 55, after being cooled by the heat exchanger 68, the solution and refrigerant vapor flow and the cooling air flow become countercurrent, improving the efficiency of the absorber 6. . Furthermore, slits 55 are provided to improve heat transfer in the fins 28. Additionally, a spiral plate or padding (not shown) is placed within the vertical tube 28 to improve contact between the concentrated solution and the stomach wall and between the concentrated solution and the refrigerant. Additionally, the inner surface of the vertical tube 28 may be provided with fins or grooves (not shown) to improve intra-tube heat transfer.

In this way, an air-cooled absorber is realized by the sensible heat of the liquid refrigerant and the cooling air. The dilute solution sucked into the solution pump 10 is preheated by the solution heat exchanger 7 from the dilute solution line 56, flows for 9 minutes, and enters the low temperature regenerator 3 from the dilute solution line filtration 8. Furthermore, the remaining dilute solution.

It is preheated by the solution heat exchanger 7 and flows into the high temperature regenerator 2 from the dilute solution line 59.

On the other hand, the concentrated solution in the high-temperature regenerator 2 enters the solution heat exchanger 7 from the concentrated solution line 40, cools itself while heating the dilute solution, and passes from the low-temperature regenerator 5 through the concentrated solution line 42 to heat the solution. Another embodiment of the present invention will be described with reference to FIG. 2. do. Only the parts of the invention that are different from the embodiment shown in FIG. 1 will be described.

A heat transfer tube 70 is provided in the vertical tube 28 of the absorber 6. The lower end of this heat transfer tube is connected to the refrigerant line 17 exiting the condenser 4,
The lower end is connected to a refrigerant line 69. The liquid refrigerant that has been sufficiently subcooled in the condenser 4 absorbs absorbed heat while passing through the absorber 6 in the heat transfer tube 70 . The liquid refrigerant that has exited the heat transfer tube 70 flows from the refrigerant line 69 to join the refrigerant lines 16 and 26 and flows from the refrigerant line 21 to the evaporator 5 . In the absorber B, the dilute solution of lithium bromide cooled by the liquid refrigerant and the cooling air is sucked into the solution pump 10.

In this way, an air-cooled absorber is realized.

Next, with reference to FIG. 5, a section taken along the line AA in FIG. 1 will be explained, and in FIG. 4, a section taken along the line AA in FIG. 2 will be explained. A plurality of fins 29 are attached to the outside of the vertical tube 28 in a star shape.

If the fins 29 extend parallel to the axis of the vertical tube 28, they may also be inclined with respect to the axis.

A duct 52, slightly away from the tip of the fin 29, surrounds the entire vertical tube. On the other hand, the vertical tube 28 and the fin 29
Cooling air cools the flow absorber 6 in counterflow with the solution and refrigerant vapor flowing in the vertical tubes 28 through the air passages 54 surrounded by etc.

In this way, since the air passage 54 is surrounded, the contact between the cooling air and the vertical pipe 28 and the fins 29 is improved, and the thermal efficiency of the absorber 6 is improved, thereby realizing an air-cooled absorber.

〔Effect of the invention〕

As described above, according to the present invention, an air-cooled absorption type water chiller can be produced, which has the first effect.

1. No cooling water is required, so there are no restrictions on securing water.

2. No cooling water system equipment such as a cooling tower or pump is required. 3. Easy installation as no cooling water piping work is required.

4. No problems such as cooling water freezing, water leakage corrosion, etc. (
7)・ Become.

[Brief explanation of drawings]

Fig. 1 is a system diagram of an embodiment of the present invention, Fig. 2 is a system diagram of another embodiment of the invention, Fig. 5 is a sectional view taken along the line I in Fig. It is a sectional view taken along IV-IY. 1: Absorption water chiller/heater body, 2: High temperature regenerator, 3: Low temperature regenerator, 4: Condenser, 5: Evaporator, 6: Absorber, 7: Solution heat exchanger, 9: Burner, 10: Solution Pump, 12: Refrigerant pump, 15: Refrigerant line. 14: heating tube, 15.1<5.17: refrigerant line. 18: Fin, 19.20: Fan, 21: Refrigerant line, 22: Cold water pipe, 25: Spreader, 24: Refrigerant reservoir, 25
, 26: Refrigerant line, 27: Evaporator shell, 28: Vertical pipe, 29: Fin, 60: Spreader, 51: Concentrated solution line, 52: Duct, 66: Inlet port, 54: Air path, 55 Nislit, 66゜58.59: Dilute solution line, 40.42
: Concentrated solution line, 48: Refrigerant flow path, 49: Air outlet, 68
: heat exchanger, 69: refrigerant line, 70: heat transfer tube. ″ (8)・Su3 Zuzai 4艷

Claims (1)

[Claims] 1. In an absorption water chiller consisting of a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, the condenser and absorber are cooled with air, and the liquid refrigerant exiting the condenser is An absorption type water chiller characterized by cooling an absorber. 2. The absorption type water chiller according to claim 1, characterized in that a heat exchanger between the liquid refrigerant exiting the condenser and the absorption liquid is installed in a space through which the dispersed absorption liquid flows down. Cold water machine. 3. The absorption water chiller according to claim 1 is characterized in that a heat exchanger between the liquid refrigerant exiting the condenser and the absorption liquid and refrigerant vapor is installed in the pipe of the absorber made of a vertical pipe. Absorption water cooler. 4. The absorption water chiller according to claim 1, characterized in that a heat exchanger between the liquid refrigerant exiting the condenser and the absorption liquid in which refrigerant vapor is mixed is installed at the outlet of the absorber made of a vertical pipe. Absorption type water chiller.