JPS6250741B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an absorption heat pump, and particularly to an absorption heat pump suitable for downsizing the heat pump and improving thermal efficiency.

[Background of the invention]

In general, absorption heat pumps are often used as air conditioners for buildings and the like because they consume less electricity and are quiet in operation.

Conventionally, most of this type of absorption heat pump uses a water-lithium bromide solution, and this cycle is as shown in FIG.
That is, a regenerator 2 is provided which separates a dilute solution into a concentrated solution and refrigerant vapor using a burner 1.
A condenser 3 is connected to the regenerator 2 to condense the separated refrigerant vapor into liquid refrigerant. The liquid refrigerant obtained by the condenser 3 is sent to the evaporator 5 via the pressure reducing valve 4, where it takes away latent heat of vaporization and performs a cooling effect. An absorber 6 is connected to the evaporator 5, and the absorber 6 absorbs the refrigerant vapor in the evaporator 5 and supplies a dilute solution obtained under pressure to the regenerator 2 using a pump 7. The concentrated solution separated by the regenerator 2 is introduced, and the refrigerant vapor from the evaporator 5 is absorbed at a high capacity. Between the absorber 6 and the regenerator 2, there is heat exchange between the high temperature concentrated solution separated by the regenerator 2 and the low temperature dilute solution fed by the absorber 6, in order to achieve thermal economy. A solution heat exchanger 8 is provided. here,
A cooling water circuit 9 is connected to each of the condenser 3 and absorber 6 in order to condense the refrigerant vapor, and as shown in the figure, the cooling water is passed through the absorber 6 and separated by the regenerator 2. Heat is removed from the concentrated solution that passes through the solution heat exchanger 8, and then from the high temperature separated refrigerant vapor that passes through the condenser 3. The hot water obtained through heat absorption is then used for heating purposes.

On the other hand, from the viewpoint that the above-mentioned absorption heat pump using a water-lithium bromide solution cannot achieve a low temperature below 0°C, it is possible to use an ammonia-water solution or a fluorocarbon-organic ether solution. is also known. This is because the solution used is closer to the boiling point of the refrigerant and absorbent than the water-lithium bromide solution mentioned above (boiling point difference of about 200°C, water-lithium bromide solution).
(500°C for lithium bromide), special considerations are required. That is, as shown in FIG. 2, in the regenerator 2, a rectifier 10 and a dephlegmator 11 are disposed in which the dilute solution supplied under pressure from the absorber 6 flows through the rectifier 10 and the diluted solution is separated. The purity of the refrigerant vapor must be increased. Such an absorption heat pump has the disadvantage of requiring a rectifier 10 and a dephlegmator 11, but on the other hand, the viscosity of the solution is low (1 cp or less, 20 cp for water-lithium bromide), and ,
Research and development is being carried out because it has many advantages, such as not having to worry about crystallization and being able to operate even at sub-zero temperatures.

However, in absorption heat pumps using any of the solutions, the condenser 3 and absorber 6 through which the cooling water circuit 9 passes are configured and installed independently, and the cooling water is supplied individually to each vessel. It was a structure that required water to pass through. As a result, since the condenser 3 and the absorber 6 are arranged separately and independently, there is a problem that the heat pump body becomes bulky and large. In addition, when recovering heat using cooling water, it passes through the two circuits of the condenser 3 and absorber 6 individually, so a large amount of heat is released outside the system, leading to an increase in heat loss. With,
There was a problem in that a pump with a large capacity was required for rated circulation of cooling water because the pressure loss also increased.

[Purpose of the invention]

The present invention focuses on the above-mentioned conventional problems, and aims to provide an absorption heat pump that can reduce the size of the body, improve thermal efficiency, and reduce pressure loss.

[Summary of the invention]

In order to achieve the above object, the absorption heat pump according to the present invention has a cooling water pipe led into the absorber that supplies a dilute solution obtained by absorbing refrigerant vapor from the evaporator to the regenerator. A double pipe is used, and the cooling water flow path is between the inner pipe and the outer pipe of the double pipe, and the refrigerant vapor separated by the regenerator is condensed into refrigerant liquid in the inner pipe of the double pipe. It was configured as a condenser with

With this configuration, the condenser is built into the absorber, and the cooling water flows through the boundary between them, making it possible to downsize the heat pump body and minimize heat loss. This makes it possible to reduce pressure loss by shortening the cooling water channel flowing inside the vessel.

[Embodiments of the Invention] Examples of the absorption heat pump according to the present invention will be described in detail below with reference to the drawings.

FIG. 3 shows a cycle diagram of the absorption heat pump according to the example. This embodiment is applied to a type of heat pump that uses an ammonia-water based solution or a fluorocarbon-organic ether based solution. As shown in FIG. 3, the heat pump has a burner 20
The regenerator 21 is heated by a regenerator 21, which separates the refrigerant vapor from the dilute solution and leads it to the condenser 22, and the separated concentrated liquid is sent to the solution heat exchanger 2.
3 and a pressure reducing valve 24 to an absorber 25.

The condenser 22 connected to the regenerator 21 and supplied with refrigerant vapor and the absorber 25 supplied with a concentrated solution are configured as follows in this embodiment. That is, a double pipe 27 as shown in FIG. 4 is passed through the vessel body 26 forming the absorber 25.
The inner pipe 28 of the double pipe 27 is used as the container body of the condenser 22. A cooling water passage 30 is formed between the outer tube 29 and the inner tube 28 of the double tube, and the refrigerant vapor flowing through the inner tube 28 is condensed to obtain a refrigerant liquid. Further, the concentrated solution from the regenerator 21 is introduced into the portion surrounded between the outside of the outer pipe 29 and the vessel body 26, and the refrigerant liquid from the condenser 22 is passed through the pressure reducing valve 31 to the evaporator 32. The refrigerant vapor that has been passed through the refrigerant to exchange heat and absorb heat is introduced.
The cooling water removes heat from the concentrated solution through the outer tube 29,
The refrigerant vapor from the evaporator 32 is absorbed into a concentrated solution. Therefore, the cooling water flowing through the cooling water passage 30 simultaneously removes heat from the refrigerant vapor from the regenerator 22 passed inside the inner pipe 28 and the concentrated solution introduced outside the outer pipe 29, and absorbs heat from inside and outside. The heated water is led out of the system and used for heating purposes.

On the other hand, the dilute solution obtained by absorbing refrigerant vapor into the concentrated solution in the absorber 25 is pressurized by the solution circulation pump 33 and returned to the regenerator 21, but in this process, the amount of the solution used is In relation to this, the flow is made to flow through the demultiplexer 34 arranged at the upper stage of the regenerator 21,
The effect is to increase the purity of the separated refrigerant vapor. The dilute solution that has passed through the dephlegmator 34 is passed through the heat exchanger 23, where heat is removed from the concentrated solution and returned to the regenerator 21 in a heated state, where the burner 20 improves thermal economy. It's on. In addition, regenerator 2
A rectifier 35 is provided in the middle position of 1 to remove impurities from the separated refrigerant vapor in advance.

In such an embodiment, the cooling water is supplied to the outer pipe 29 and inner pipe 2 of the double pipe 27 as shown in FIG.
8, and recovers the latent heat of condensation and the heat of absorption. At this time, a concentrated solution can be flowed on the outer surface of the outer tube 29 to function as an absorber 25, and refrigerant vapor can be passed inside the inner tube 28 to function as a condenser 22.

As described above, according to the embodiment, the double pipe 27 is passed inside the vessel body 26 of the absorber 25, and the inside and outside are the condenser 22 and the absorber 25, and the boundary between them is the cooling water passage 30. Condenser 22 and absorber 2
5 can be housed in one container, making it possible to downsize the heat pump body and achieve effective space utilization. In addition, when recovering heat using cooling water, since the condenser 22 and absorber 25 are integrated, heat loss at their connections can be minimized, unlike in the past when they were separate. . Furthermore, by integrating the condenser 22 and absorber 25, the length of the cooling water passage 30 can be shortened and heat can be recovered in a short period of time, so the pressure loss of the cooling water can also be minimized. Another advantage is that the capacity of the cooling water circulation pump is small.

It goes without saying that the present invention can also be applied to a heat pump using a water-lithium bromide solution.

〔Effect of the invention〕

According to the present invention, the cooling water pipe installed in the absorber is a double pipe, and the space between the inner pipe and the outer pipe of the double pipe is used as a cooling water flow path, and the inner pipe of the double pipe is used to conduct refrigerant vapor. Since the condenser condenses the refrigerant liquid, the condenser and absorber are integrated, making the heat pump more compact.It also reduces the amount of heat generated at connections between devices when the condenser and absorber are separate. Loss can be kept to a minimum, and the cooling water receives absorbed heat through the outer pipe of the double pipe, and at the same time receives condensation heat of the refrigerant through the inner pipe of the double pipe, so the cooling water flow path is shortened and the cooling water This has the effect of reducing pressure loss, requiring a smaller capacity of the cooling water circulation pump, and improving the overall efficiency of the heat pump.

[Brief explanation of the drawing]

Figure 1 is a cycle diagram of a conventional water-lithium bromide absorption heat pump, and Figure 2 is an ammonia-lithium bromide absorption heat pump cycle diagram.
The same cycle diagram for water systems and fluorocarbon-organic ether systems,
FIG. 3 is a cycle diagram of an absorption heat pump according to an embodiment, and FIG. 4 is a sectional view of a double pipe. 20... Burner, 21... Regenerator, 22... Condenser, 25... Absorber, 26... Absorber body, 2
7...double pipe, 30...cooling water passage, 32...evaporator.

Claims (1)

[Claims] 1. The cooling water pipe led into the absorber that supplies the dilute solution obtained by absorbing refrigerant vapor from the evaporator to the regenerator is a double pipe, and the inner pipe and outer pipe of the double pipe are An absorption heat pump characterized in that the inner pipe of the double pipe is used as a condenser for condensing refrigerant vapor separated by the regenerator into refrigerant liquid.