JPH0559165U - Absorption chiller / heater - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to improve the refrigerating capacity by suppressing the ineffective refrigerant generated in the evaporator. [Structure] A plurality of heat transfer tubes 1 arranged in the flow direction of the refrigerant
A tray 16 for receiving and storing the ineffective refrigerant flowing down is attached to the heat transfer tube 11a in the lowermost row of No.1. [Effect] Since the heat transfer tubes in the bottom row are submerged in the stored liquid, the wettability of the heat transfer tubes is improved, the ineffective refrigerant is evaporated, and a part of the ineffective refrigerant can be recovered as the refrigerating capacity.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improving the efficiency of refrigerating capacity, and particularly to an absorption chiller-heater equipped with an evaporator suitable for suppressing generation of ineffective refrigerant.

[0002]

[Prior Art]

 As the conventional absorption chiller-heater, a single-effect absorption chiller-heater and a double-effect absorption chiller-heater are known. As an example, the double-effect absorption chiller-heater shown in FIG. The dilute solution obtained by absorbing the refrigerant evaporated in 1. in the absorber 7 is pressure-fed by the solution pump 9 to the high temperature regenerator 1 via the low temperature solution heat exchanger 5 and the high temperature solution heat exchanger 4, and in the high temperature regenerator 1. It is heated by the burner 10 and separated in the separator 2 into a refrigerant vapor and an intermediate concentrated solution. The refrigerant vapor is condensed in the condenser 6 via the low temperature regenerator 3 and returned to the evaporator 8, where the intermediate concentrated solution becomes The solution is heated and concentrated by the low temperature regenerator via the high temperature solution heat exchanger 4 to become a concentrated solution, and returned to the absorber 7 via the low temperature solution heat exchanger 5.

As shown in FIGS. 4 and 5, the evaporator 8 has a plurality of heat transfer tubes 13 arranged at a predetermined pitch in the refrigerant flow direction (arrow) and the crossing direction thereof, and together with the absorber 7. It is housed in the body 12. In the case of the non-refrigerant recirculation system, the ineffective refrigerant 13 generated in the evaporator 8 drops from the lowermost row (final row) 11a of the heat transfer tubes 11 and is mixed with the dilute solution 14. The ineffective refrigerant 13 is a non-evaporated refrigerant that is considered to be generated when the heat transfer performance is deteriorated due to poor wettability due to the presence of non-condensed gas in the case 12 and the fouling of the heat transfer tube 11. In the case where the heat transfer tubes 11 have poor wettability, the refrigerant dropped in the upper row of the evaporator 8 has poor wetting / diffusion in the heat transfer tubes 11, so the refrigerant flows down the heat transfer tubes 11 into the streaks 15 and is left in the bottom row. Falls from the heat transfer tube 11a, is mixed with the dilute solution 14, and the refrigerating capacity corresponding to the ineffective cooling medium 13 is reduced.

[0004]

[Problems to be Solved by the Invention] In the conventional absorption chiller-heater, there is a problem that an ineffective refrigerant is generated in the evaporator and the refrigerating capacity is lowered.

An object of the present invention is to provide an absorption chiller-heater equipped with an evaporator capable of suppressing generation of ineffective refrigerant.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the absorption chiller-heater according to the present invention, the diluted solution in which the refrigerant evaporated in the evaporator is absorbed in the absorber is pumped to the regenerator via the solution heat exchanger, In the absorption chiller-heater, the refrigerant is heated and separated into refrigerant vapor and concentrated solution, the refrigerant vapor is condensed and returns to the evaporator, and the concentrated solution returns to the absorber via the solution heat exchanger. The container is configured such that a tray for storing ineffective refrigerant is attached to the final row of the plurality of heat transfer tubes arranged in the refrigerant flow direction.

[0007]

[Action]

 According to the present invention, since the tray for storing the invalid refrigerant is attached to the final row of the plurality of heat transfer tubes arranged in the evaporator, the invalid refrigerant flowing down the heat transfer tubes in a streak shape is stored in the tray, and the final refrigerant is stored in the tray. The heat transfer tubes in the row are submerged in the stored liquid to improve the wettability of that portion, and a part of the ineffective refrigerant is recovered as refrigerating capacity. Then, only the invalid refrigerant that overflows the tray falls, and the amount of the invalid refrigerant mixed in the dilute solution is reduced.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, for example, in a refrigeration cycle of a double-effect absorption chiller-heater, a dilute solution obtained by absorbing the refrigerant evaporated in the evaporator 8 by the absorber 7 by the solution pump 9 and the low temperature solution heat exchanger 5 and the high temperature It is pressure-fed to the high temperature regenerator 1 via the solution heat exchanger 4, is heated by the burner 10 in the high temperature regenerator 1, and is separated into the refrigerant vapor and the intermediate concentrated solution in the separator 2, and the refrigerant vapor is regenerated at low temperature. After being condensed in the condenser 6 via the condenser 3 and returned to the evaporator 8, the intermediate concentrated solution is heated and concentrated by the low temperature regenerator via the high temperature solution heat exchanger 4 into a concentrated solution, which is the low temperature solution heat exchanger. It returns to the absorber 7 via 5.

As shown in FIGS. 2 and 3, the evaporator 8 has a plurality of heat transfer tubes 11 arranged in the refrigerant flow direction (arrow) and the intersecting direction thereof with the length direction substantially horizontal. It is housed in the case 12 together with the absorber 7. A tray 16 for receiving and storing the ineffective refrigerant flowing down the heat transfer tubes 11 in a streak shape 15 is provided below the heat transfer tubes 11a in the final row (the bottom row) in the refrigerant flow direction.

The tray 16 is attached to each heat transfer tube 11a in the bottom row and has a rectangular cross section with an open upper surface, and the lower surface thereof is slightly larger than the diameter of the heat transfer tube 11a and is adjacent to the adjacent heat transfer tube 11a. It has a width capable of forming a gap for allowing the invalid refrigerant to overflow with the tray 16 and a height reaching almost the center line of the heat transfer tube 11a, and both ends in the longitudinal direction are fixed to both ends of the heat transfer tube 11. Not adhered to and supported by the header.

Next, the operation of this embodiment will be described. The refrigerant flows in from the direction of the arrow, flows in the heat transfer tube 11 and takes the vaporization heat of the liquid (water) circulating between it and a refrigerating load (not shown) to be evaporated. However, when the heat transfer tubes 11 are poor in wettability due to dirt or the like, a part of the heat transfer tubes 11 remains in a liquid state and becomes an ineffective refrigerant, flowing down the heat transfer tubes 11 in the streaks 15 and reaching the heat transfer tubes 11a in the bottom row. Therefore, the invalid refrigerant is received by the tray 16 and becomes a liquid pool. When the height of the tray 16 is exceeded, the invalid refrigerant overflows and falls, but the amount of the invalid refrigerant decreases and mixes with the dilute solution 14 accumulated on the bottom surface of the barrel 12. To do. Since the heat transfer tubes 11a in the lowermost row are immersed in the invalid cooling medium that has accumulated in the tray 16, the wettability of the heat transfer tubes 11a in that part is improved, the invalid refrigerant evaporates, and some of the invalid refrigerant is frozen. Recovered as an ability.

Further, in the case where, for example, fin processing is performed on the outer surface of the heat transfer tube to improve wettability, the ineffective cooling medium is transferred in the upper row due to the capillary phenomenon due to the effect of the processing from the portion submerged in the tray. Since it can be expected to diffuse into the heat pipe, the refrigeration capacity recovery effect will be further improved.

[0013]

[Effect of the device]

 According to the present invention, since the invalid refrigerant generated in the evaporator is stored in the tray and the wettability of the heat transfer tubes in the bottom row is improved, a part of the invalid refrigerant can be recovered as the refrigerating capacity, which improves the refrigerating capacity. It is possible to provide an absorption chiller-heater.

[Brief description of drawings]

FIG. 1 is a diagram showing a refrigeration cycle of an absorption chiller-heater.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of this embodiment.

FIG. 4 is a diagram illustrating an operation of a conventional technique.

FIG. 5 is a diagram illustrating an operation of a conventional technique.

[Explanation of symbols]

 1 Regenerator (high temperature regenerator) 4 High temperature solution heat exchanger (solution heat exchanger) 5 Low temperature solution heat exchanger (solution heat exchanger) 7 Absorber 8 Evaporator 11 Heat transfer tube 11a Final row heat transfer tube 16 Tray

Claims (1)

[Scope of utility model registration request] 1. A dilute solution in which a refrigerant evaporated in an evaporator is absorbed by an absorber is pressure-fed to a regenerator via a solution heat exchanger and heated in the regenerator to separate into a refrigerant vapor and a concentrated solution. The refrigerant vapor is condensed and returned to the evaporator, and the concentrated solution returns to the absorber via the solution heat exchanger in the absorption chiller water heater, wherein the evaporator is in the flow direction of the refrigerant. An absorption chiller-heater characterized in that a tray for storing ineffective refrigerant is attached to the final row of a plurality of arranged heat transfer tubes.