KR100234062B1 - Ammonia absorber cycle - Google Patents

Abstract

The present invention relates to an ammonia absorption cycle, and in particular, to increase the refrigerant purity, in addition to using the conventional low temperature steel solution, the cooling water used for cooling the absorber and condenser of the heat pump is introduced into the rectifier and then rectified by a low temperature solution. The goal is to improve the performance of the system by implementing a two-stage rectification cycle with coolant.

In order to achieve this, the present invention provides a regenerator for heating and boiling a strong solution to regenerate a low concentration solution, a rectifier for condensing and rectifying refrigerant vapor generated in the regenerator, and a condenser for condensing refrigerant vapor from the rectifier with a liquid refrigerant. And an ammonia absorption heat pump including an evaporator for evaporating the refrigerant condensed in the condenser to form cold water and an absorber for absorbing the refrigerant vapor evaporated in the evaporator, wherein the cooling water having passed through the absorber is introduced into the rectifier for rectification. It is configured to heat exchange.

Description

Ammonia absorber cycle

The present invention relates to an ammonia absorption type cycle, and more particularly, to a rectification cycle of an ammonia absorption type heat pump that rectifies refrigerant vapor generated in a regenerator in an ammonia absorption type heat pump during air cooling.

Referring to the cycle configuration of the conventional ammonia absorption heat pump as shown in Figure 1, the regenerator (1) and the regenerator (1) which heat and boil the strong solution to generate ammonia vapor and regenerate it into a low concentration solution having excellent absorption. A rectifier (2) for condensing and rectifying the water vapor contained in the ammonia vapor generated in the condensate, a condenser (3) for condensing the refrigerant vapor from the rectifier (2) with a liquid refrigerant, and an evaporator for evaporating the actual refrigerant to form cold water ( 4), the absorber 5 absorbing the refrigerant vapor generated in the evaporator 4, the first pressure reducing mechanism 7b for lowering the pressure of the medicinal solution, and the pressure of the high pressure liquid refrigerant from the condenser 3; A second pressure reducing mechanism (7a) for lowering the pressure to the pressure of the low pressure part, a solution pump (8) for sending the strong solution of the low pressure part to the regenerator (1), and a first circulation pump (11a) for pumping cold / hot water to the indoor unit ) And coolant to the outdoor unit The second consists of a circulation pump (11b), and a heating / cooling cycle, four-way valve (12a, 12b) for changing the direction of flow of the cooling water, the cold / hot switchover.

In the figure, reference numeral 6 denotes a heat exchanger, and 9 denotes an indoor unit.

Ammonia absorption cycles using ammonia as a refrigerant and water as an absorbent require a heat exchanger, a rectifier (2), unlike a lithium bromide cycle.

The reason for this is that the aqueous ammonia system has a relatively small difference in the boiling point of the cationic component (ammonia: -33.8 ° C, water: 100 ° C), making it difficult to separate easily. In such a case, a rectifier is needed to divide the pure components by using the concentration difference between two liquid phases in equilibrium.

In ammonia absorption cycle, the effect of refrigerant purity on the performance is very large. As an example, consider the case where ammonia concentrations are 90% and 100%. In the case of the concentration of 100%, when the evaporation temperature is 0 ° C, the pressure is 0.43 MPa, and the refrigerant evaporates completely under isothermal isothermal pressure in the evaporator. In contrast, as shown in FIG. 2, when the concentration is 90%, it is necessary to maintain 0.39 MPa. When the evaporation is carried out at a constant pressure in a two-component system, the boiling point rises with the change of the liquid component, so that evaporation starts at 0 ° C at point A, but the evaporation completion temperature at point B reaches 81 ° C. Although the evaporation temperature indicated by the straight line L-V can be effectively used up to 10 ° C, the evaporation of the refrigerant at the outlet of the evaporator is 30% (VC / VL). It is understood that the refrigeration effect is greatly reduced due to this unevaporated powder, and it is understood that maintenance of refrigerant purity, that is, rectification is important.

Conventionally, as shown in FIG. 1, the refrigerant is rectified by condensing water vapor components in the refrigerant vapor by heat-exchanging the low-temperature steel solution and the low-purity refrigerant vapor generated in the regenerator in the rectifier 2. However, in this case, the high purity refrigerant is difficult to obtain as the load of the rectifier is treated only with a low temperature steel solution, thereby degrading performance.

In addition, in order to obtain a high concentration of refrigerant, the size of the product must be increased. Especially in a high efficiency cycle such as a GAX cycle, the load of the rectifier must be extracted because the water (H ₂ 0) component must be extracted so that the concentration of the solution is as low as 2%. There is a problem that grows larger and larger, and also has a problem that has a big impact on the size of the product.

In order to solve the problems of the prior art as described above, the present invention is configured such that the coolant having passed through the absorber flows into the rectifier, and the coolant is introduced into the rectifier, and the refrigerant vapor rectified in the first stage by the strong solution is returned to the coolant. The purpose is to improve the performance of the system by increasing the purity of the refrigerant vapor by rectifying.

1 is a conventional ammonia absorption cycle structure diagram.

Figure 2 shows the temperature change of the evaporation process.

Figure 3 is a structure diagram of the present invention ammonia absorption cycle.

4 is a first embodiment of the present invention;

5 is a second embodiment of the present invention.

6 is a third embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

1: regenerator 2: rectifier

3: condenser 4: evaporator

5: absorber 6: heat exchanger

7a, 7b: expansion valve 8: solution pump

9: indoor unit 10: outdoor unit

11a, 11b: Circulation pump 12a, 12b: 4-way valve

The present invention is described in detail below with reference to FIGS. 3 to 6.

First, as shown in FIG. 3, a regenerator 1 for heating and boiling a strong solution to regenerate a low concentration solution, a rectifier 2 for condensing and rectifying refrigerant vapor generated in the regenerator 1, and A condenser (3) for condensing the refrigerant vapor from the rectifier (2) with a liquid refrigerant, an evaporator (4) for evaporating the refrigerant condensed in the condenser to produce cold water, and a refrigerant vapor evaporated in the evaporator (4) In the ammonia absorption type heat pump composed of the absorber 5, the cooling water passed through the absorber 5 is flowed into the rectifier for heat exchange for rectification.

The ammonia absorption cycle of the present invention configured as described above is equipped with a heat exchanger coil at the top of the rectifier 2 with cooling water (approximately 46 ° C.) passing through the absorber to introduce the cooling water into the coil, cool the refrigerant vapor, and condense the water vapor components to achieve high purity. It is to obtain a refrigerant to ensure high performance.

In another embodiment, as shown in FIG. 4, the coolant having passed through the absorber 5 and the condenser 3 may be introduced into the rectifier 2 to be used for rectification. In another embodiment, the outdoor unit 10 may be used as shown in FIG. 5. The low temperature cooling water coming from) is branched in front of the absorber (5), introduced into the rectifier and used for rectification, and then joined at the rear end of the condenser (3). The cooling water passed through 5) is branched at 13a, and a part of the cooling water is introduced into the rectifier 2 to be heat exchanged and then joined at 13b after the condenser 3.

As described above, the ammonia absorption cycle structure of the present invention enables high performance cycles by securing a high concentration of refrigerant, and in particular, by improving the system performance and product by securing a high concentration of refrigerant with a small rectifier in a high efficiency cycle such as a GAX cycle. It is effective to achieve compactness.

Claims (1)

A regenerator for heating and boiling steel solution to regenerate it into a low concentration solution, a rectifier for condensing and rectifying refrigerant vapor generated in the regenerator, a condenser for condensing refrigerant vapor from the rectifier with liquid refrigerant, and condensing in the condenser In the ammonia absorption heat pump comprising an evaporator for evaporating the refrigerant to make cold water, and an absorber for absorbing the refrigerant vapor evaporated in the evaporator, It is configured to return the cooling water passed through the absorber to the rectifier for heat exchange and then to return, and to return the low-temperature steel solution of the absorber to the rectifier for heat exchange and then to return. The cooling water is branched before the absorber is configured to be joined again at the rear end of the condenser after entering the rectifier, and the cooling water passed through the absorber branched into the rectifier and configured to be joined with the remaining cooling water through the condenser. Ammonia absorption type cycle.

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