JPH0473057B2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to an air-cooled absorption water chiller.

[Background of the invention]

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

[Purpose of the invention]

An object of the present invention is to provide an absorption type water cooler that can be made smaller.

[Summary of the invention]

The present invention includes a high temperature regenerator, a low temperature regenerator, a condenser,
In an absorption water chiller consisting of an evaporator and an absorber,
A plurality of vertical pipes are provided at the bottom of the evaporator to form an absorber, and the solution and refrigerant vapor are allowed to flow down from the top of the vertical pipes, and forced air is forced out of the vertical pipes.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. The absorption type water chiller 1 includes a high temperature regenerator 2, a low temperature regenerator 3, a condenser 4, an evaporator 5, an absorber 6, a high temperature heat exchanger 7, a low temperature heat exchanger 8, a burner 9, a dilute solution pump 10, and a concentrated solution pump 10. It is composed of a solution pump 11 and a refrigerant pump 12. The aqueous lithium bromide solution in the high-temperature regenerator 2 is heated by the burner 9 to generate refrigerant vapor and concentrate the solution. The generated refrigerant vapor passes through the refrigerant line 13 to the heating pipe 14 in the low temperature regenerator 3.
flows into. The lithium bromide aqueous solution in the low-temperature regenerator 3 is heated by the refrigerant vapor in the heating tube 14,
Refrigerant vapor is also generated here. Here, heating tube 1
The refrigerant vapor in 4 is liquefied, and the lithium bromide aqueous solution is concentrated.

The refrigerant vapor generated in the low temperature regenerator 3 enters the condenser 4 through the refrigerant line 15, while the liquefied refrigerant passes through the refrigerant line 16 and joins the refrigerant in the refrigerant line 17. The condenser 4 has fins 18 outside the tube, and a fan 19 moves outdoor air into the fins 18.
As it flows through, the refrigerant vapor in the condenser 4 is cooled and liquefied. The liquid refrigerant flows from the refrigerant line 17 into the evaporator 5 through the refrigerant line 21 , where it joins with the liquid refrigerant from the refrigerant line 16 , and also with the liquid refrigerant discharged from the refrigerant pump 12 .

There is a cold water pipe 22 in the evaporator 5, and liquid refrigerant is sprayed onto the cold water pipe 22 from a sprayer 23. Since the inside of the evaporator 5 is maintained under reduced pressure, the liquid refrigerant evaporates and its latent heat is taken away from the cold water in the cold water pipe. The liquid refrigerant that has not been completely evaporated accumulates in the refrigerant tray 24 and is transferred to the refrigerant line 25 and the refrigerant pump 1.
2. Pass through the refrigerant line 26 and reconnect to the refrigerant line 2.
Return to 1. The refrigerant vapor evaporated here descends between the evaporator shell 27 and the refrigerant tray 24 and flows into the absorber 6.

The absorber 6 consists of a vertical tube 28 connected below the evaporator shell 27 and a fin 29 outside the tube. Further, there is a sprayer 30 in the upper part of the vertical pipe 28, and the concentrated solution coming from the concentrated solution pump 11 through the concentrated solution line is sprayed from the sprayer 30. The sprayed concentrated solution is cooled by outdoor air flowing outside the tube while flowing down along the wall of the vertical tube 28, 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.

There is a duct 32 around the absorber 6, which encloses the absorber 6 and the evaporator 5 and becomes the suction duct of the fan 20. An air passage 34 is formed between the suction device vertical pipe 28 and the duct 32, and the fan 2
The rotation of 0 generates an upward wind in the air passage 34,
This wind causes the absorber fins 29 and the vertical pipe 28 to
is cooled. Moreover, the air flowing through the air passage 34 is
Outdoor air is sucked through the intake port 33.

In this way, the solution and refrigerant vapor flow and the cooling air flow are countercurrent in the absorber 6, increasing the efficiency of the absorber 6 and thus realizing an air-cooled absorber. Additionally, slits 35 are provided to improve heat transfer in the fins 28. Furthermore, the vertical pipe 28
A spiral plate or padding (not shown) is placed inside to improve contact between the concentrated solution and the tube 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.

The dilute solution thus produced passes through the dilute solution line 36 from the dilute solution pump 10, is preheated by the low temperature heat exchanger 8, and is divided into the dilute solution lines 37 and 38. One line 37 is further heated by the high temperature heat exchanger 7 and flows into the high temperature regenerator 2 from the line 39. The other line 38 flows directly into the low temperature regenerator 3.

The concentrated solution coming out of the high temperature regenerator 2 is transferred to the concentrated solution line 4.
The concentrated solution line 42 from the low temperature regenerator 3 enters the high temperature heat exchanger 7 and is cooled from the
The concentrated solution line 44, the concentrated solution pump 11, and the line 31 are supplied to the absorber 6.

Next, an embodiment of the cross section AA in FIG. 1 will be described with reference to FIG. A plurality of fins 29 are attached outside the vertical tube 28 in a star shape. This Finn 29
extends parallel to the axis of the vertical tube 28. In this case, it may be inclined with respect to the axis. A duct 32 slightly distant from the tip of the fin 29 is approximately concentric with the vertical tube 28 and surrounds the entire vertical tube. On the other hand, there is a cylinder 45 in the center between the diagonal vertical tubes. In this way, the air passage 34 surrounded by the duct 32, the cylinder 45, the vertical pipe 28, the fins 29, etc.
Cooling air cools the flow absorber 6 in counterflow with the solution and refrigerant vapor flowing in the vertical tubes 28 .

In this way, since the air passage 34 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.

Note that it is desirable to attach a heat insulating material (not shown) around the evaporator shell 27 so that the air after cooling the absorber 6 does not heat the evaporator.

[Effects of the Invention] According to the present invention, since the absorber is arranged below the evaporator, a refrigerant vapor pipe is not necessary, and an air-cooled absorption type water chiller can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a structure and system diagram of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. 1: Absorption water cooler body, 2: High temperature regenerator, 3:
Low temperature regenerator, 4: Condenser, 5: Evaporator, 6: Absorber, 7: High temperature heat exchanger, 8: Low temperature heat exchanger, 9:
Burner, 10: Dilute solution pump, 11: Concentrated solution pump, 12: Refrigerant pump, 13: Refrigerant line, 1
4: Heating tube, 15, 16, 17: Refrigerant line, 1
8: Fan, 19, 20: Fan, 21: Refrigerant line, 22: Cold water pipe, 23: Spreader, 24:
Refrigerant tray, 25, 26: Refrigerant line, 27: Evaporator shell, 28: Vertical pipe, 29: Fin, 30: Spreader, 31: Concentrated solution line, 32: Duct, 3
3: Intake port, 34: Air path, 35: Slit, 3
6, 37, 38, 39: Dilute solution line, 40, 4
1, 42, 43, 44: concentrated solution line, 45: cylinder.

Claims (1)

[Claims] 1. High temperature regenerator, low temperature regenerator, condenser, evaporator,
In an absorption water chiller consisting of an absorber, a plurality of vertical pipes are provided at the bottom of the evaporator to form the absorber, and the solution and refrigerant vapor are allowed to flow down from the top of the vertical pipes, and forced ventilation is conducted outside the vertical pipes. Features: Absorption type water chiller. 2. The absorption type according to claim 1, characterized in that heat transfer fins are provided outside the vertical pipe, and the solution and refrigerant vapor flowing down into the vertical pipe are cooled by forced ventilation through the fins. Cold water machine. 3. The absorption type water cooler according to claim 1, characterized in that a plurality of fins are attached to the outside of the vertical pipe in parallel with the vertical pipe or at an angle. 4. The absorption water chiller according to claim 1, wherein forced ventilation is carried out from the bottom of the vertical pipe toward the top in a counterflow to the solution and refrigerant vapor flowing down inside the vertical pipe. 5. The absorption type water chiller according to claim 1, further comprising a duct surrounding the vertical pipe group. 6. The method according to claim 1, characterized in that a refrigerant tray is provided at the lower part of the heat transfer tube group of the evaporator, and a refrigerant tray is provided between the refrigerant tray and the evaporator shell in a flow path through which refrigerant vapor descends. Absorption water cooler. 7 At the bottom of the refrigerant tray and at the top of the vertical pipe,
7. The absorption water cooler according to claim 6, further comprising a dispersion port for distributing a solution with a low refrigerant content. 8. The absorption type water chiller according to claim 1, wherein the condenser is constructed of a pipe, and refrigerant vapor flows inside the pipe and cooling air flows outside the pipe. 9 Make slits in the fins on the outer surface of the vertical pipe,
2. The absorption type water cooler according to claim 1, wherein the inner surface of the tube is also provided with fins or grooves, and the inside of the tube is stuffed.