JP2583579B2 - Absorption chiller with refrigerant circulation system for cooling and heating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an absorption refrigerator having a refrigerant circulation system for cooling and heating.
TECHNICAL FIELD The present invention relates to an absorption refrigerator having a cooling / heating refrigerant circulation unit that directly performs cooling / heating with a refrigerant, which is suitable for high efficiency.

[Related Art] In a conventional absorption refrigerator, water is used as a medium to extract heat from a fan coil installed in a room to be air-conditioned to cool it, or to send heat to heat it. Therefore, a heat exchanger such as an evaporator or a water heater is required to transfer heat to the water as the medium. Therefore, in order to increase the overall efficiency of the cooling and heating system, the heat transfer performance of the evaporator and the water heater must be improved, and the structure is complicated.

That is, in the conventional apparatus, a regenerator, a condenser, and an absorber are combined with an evaporator and a water heater, and a cooling operation or a heating operation is performed by switching with a number of valves provided in a piping system for operatively connecting these. And was doing. Then, cooling and heating can be performed by transferring heat from the fan coil using water as a medium. Therefore, since the heat of the fan coil is transferred using water as a medium through a heat exchanger such as an evaporator and a water heater, the structure is complicated, the operation is difficult, and the efficiency of the entire system is deteriorated.

Related devices of this type include, for example,
The technology described in 44-32707 is mentioned.

[Problem to be Solved by the Invention] The above-mentioned conventional technique will be described more specifically with reference to FIGS. 3 and 4. FIG.

FIG. 3 is a system diagram showing a cooling cycle of a conventional absorption refrigerator, and FIG. 4 is a system diagram showing a heating cycle of the absorption refrigerator. In this absorption refrigerator, water is used as a refrigerant, and lithium bromide is used as an absorbent.

When performing the cooling cycle, as shown in FIG. 3, the refrigerant 26 is evaporated in the evaporator 29, and the chilled water 25 is indirectly cooled by the heat of vaporization through the heat transfer tube of the evaporator 29. And sent to the fan coil 6 for cooling.

On the other hand, when performing the heating cycle, as shown in FIG. 4, a heat exchanger or the like (evaporator 29,
A water heater 23 is installed separately from the absorber 2 and the condenser 3), and the high-temperature refrigerant vapor 27 generated in the high-temperature regenerator 4 is sent to the water heater 23 to be condensed. The hot water is sent to the fan coil 6 to perform cooling.

More specifically, during the cooling operation, as shown in FIG. 3, the refrigerant pump 24 is operated to circulate the refrigerant so that the refrigerant 26 is constantly evaporated by the evaporator 29, and the refrigerant is evacuated from the refrigerant outlet 21. It is sprayed in the container 29. The cooling steam evaporated by the evaporator 29 is absorbed by the absorbent 28 sprayed from the solution outlet 19. The heat absorbed at this time is cooled by cooling water (or cooling air) 20b. In addition, a solution pump is used to constantly eject a thick absorbent 28 having an absorbing capacity from the solution outlet 19.
Activate 13. At this time, the solution on / off valves 11 and 12 are opened, and the absorbent diluted by absorbing the refrigerant vapor passes through the solution on / off valve 12 and enters the high-temperature regenerator 4 through the solution heat exchanger 5 where the heat source The mixture is boiled by 18 to disperse the refrigerant vapor, and again becomes a thick absorbent having an absorbing ability, and is sprayed from the solution jet port 19 of the absorber 2 through the solution heat exchanger 5 and the solution opening / closing valve 11. Since the refrigerant vapor separated from the lean absorbent in the high-temperature regenerator 4 has a high temperature, it is sent to the condenser 3 through the refrigerant vapor switching valve 10 and is cooled and condensed by the cooling water (or cooling air) 20a. Return to 29.

On the other hand, during the heating operation, as shown in FIG.
9. Since the absorber 2 and the condenser 3 are not required, the refrigerant pump 24
And the solution pump 13 is stopped. In addition, high temperature regenerator 4
Since there is no need to circulate the absorbent from the filter to the absorber 2, the solution on-off valves 11, 12 are closed. High-temperature refrigerant vapor from the high-temperature regenerator 27
Is not sent to the condenser 3, but is sent to the water heater 23 to heat the cold water 25, then condensed and returned to the high temperature regenerator 4 again.

Thus, in order to switch the cooling and heating cycles,
Refrigerant vapor switching valve 10, solution on-off valves 11, 12 and cold / hot water switching valve 22
Must be operated to operate the solution pump 13 and the refrigerant pump 24, which is troublesome. And evaporator 2
9. There is a drawback that there are many heat exchangers including the water heater 23 and the structure is complicated.

Further, the exchange of heat between the refrigerator unit and the fan coil 6 is performed through a heat exchanger such as the evaporator 29 or the water heater 23 using water as a medium, so that the efficiency is low.

The present invention has been made in order to solve the above-mentioned problems in the prior art, and it is possible to replace the evaporator and the water heater with a structure having one simple space area, and to transfer heat directly to and from a fan coil by a refrigerant. Therefore, it is an object of the present invention to provide an absorption refrigerator having a cooling / heating refrigerant circulation system capable of simplifying the structure including piping and improving the thermal efficiency as a cooling / heating cycle.

[Means for Solving the Problems] In order to achieve the above object, at least the configuration of an absorption refrigerator equipped with a refrigerant circulation system for cooling and heating according to the present invention includes:
A regenerator, a condenser, an absorber, a solution pump, a solution on-off valve, and a solution piping system for connecting the regenerator and the absorber.
In an absorption refrigerator including a cooling / heating refrigerant circulation system including a refrigerant circulation system having a fine coil, a low-temperature refrigerant or a high-temperature refrigerant supplied to the fan coil is provided to the refrigerant circulation system. An evaporator / hot water generator that forms a space region for generating a refrigerant is provided, the evaporator / hot water generator includes a refrigerant on-off valve, and a liquid refrigerant pipe connected to the condenser, and a refrigerant vapor on-off valve. A refrigerant vapor flow path communicating with the absorber, a liquid refrigerant pipe having a refrigerant on-off valve and connected to the regenerator, and a refrigerant vapor pipe having a refrigerant vapor switching valve and connected to the regenerator. Each is connected.

It should be noted that the concept of developing the present invention is to provide an evaporator and a hot water generator that constitutes a space region having both functions in a portion corresponding to a conventional evaporator and a water heater. .

The refrigerant circulates through the evaporator and hot water generator, and a cooled refrigerant or a heated refrigerant is produced here, and the refrigerant is directly sent to a fan coil to cool and heat the air-conditioned room. It has a configuration.

[Operation] The evaporator / hot water generator is a structure having a simple container-shaped space region.

During the cooling operation, the pressure in the container (evaporator / hot water generator) becomes low due to the action of the absorber, and the refrigerant contained therein evaporates. Therefore, the refrigerant that has been deprived of the heat of vaporization and has fallen in temperature and has not completely evaporated is cooled down as a liquid. Since the low-temperature liquid refrigerant is sent to the fan coil as it is, cooling can be easily performed.

On the other hand, during the heating operation, the inside of the evaporator / hot water generator has substantially the same pressure as the regenerator, and the liquid refrigerant therein is heated by the high-temperature refrigerant vapor sent from the high-temperature regenerator. Since this high-temperature liquid refrigerant is sent to the fan coil as it is, heating can be easily performed.

Thus, the generation of circulating refrigerant sent to the fan coil is
Since the operation is performed in a simple container, the operation can be reliably performed. Further, switching between the refrigerant and the heating is possible by opening and closing several valves, so that no malfunction occurs.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. 1 and FIG.

FIG. 1 is a system diagram showing a cooling cycle of an absorption refrigerator according to one embodiment of the present invention, and FIG. 2 is a system diagram showing a heating cycle of the absorption refrigerator. In the figure, the third and fourth
Those having the same reference numerals as those in the drawings indicate the same or corresponding parts.

This absorption refrigerator uses water as a refrigerant and lithium bromide as an absorbent.

First, the configuration of an absorption refrigerator equipped with a refrigerant circulation system for cooling and heating according to the present embodiment will be described with reference to FIG.

In FIG. 1, reference numeral 1 denotes an evaporator / hot water generator, and the evaporator / hot water generator 1 is a container-like structure having a simple space area therein. 2 is an absorber, 3 is a condenser, 4 is a high temperature regenerator, 5 is a solution heat exchanger, and 6 is a fan coil installed in the room to be air-conditioned.

Reference numeral 7 denotes a refrigerant vapor opening / closing valve. The refrigerant vapor opening / closing valve 7 is provided in a refrigerant vapor flow passage 30 that communicates upper portions of the evaporator / hot water generator 1 and the absorber 2.

Reference numeral 8 denotes a refrigerant on-off valve. The refrigerant on-off valve 8 is provided in a liquid refrigerant pipe 31 connecting the bottom of the evaporator / hot water generator 1 and the high-temperature regenerator 4, and serves as a refrigerant return valve to the high-temperature regenerator 4. Function.

Reference numeral 9 denotes a refrigerant on-off valve. The refrigerant on-off valve 9 is provided in a liquid refrigerant pipe 32 connecting the evaporator / hot water generator 1 and the bottom of the condenser 3, from the condenser 3 to the evaporator / hot water generator 1. Function as a refrigerant return valve.

Reference numeral 10 denotes a refrigerant vapor switching valve. This refrigerant vapor switching valve 10 is provided in a refrigerant vapor pipe 33 connecting the upper part of the high temperature regenerator 4 and the upper part of the evaporator / hot water generator 1. It functions as a cooling switching valve for switching the steam to the condenser 3 side and the evaporator / hot water generator 1 side for cooling and heating.

11 is a solution on-off valve provided in the concentrated solution piping 34, 12 is
A solution opening / closing valve provided in the dilute solution pipe 35, 13 is a solution pump, 14 is a refrigerant pump, and this refrigerant pump 14 is mounted on a generated refrigerant delivery pipe 36 of a refrigerant circulation system having a fan coil 6. Reference numeral 15 denotes a refrigerant outlet of a refrigerant return pipe 37 opened at an upper part of the evaporator / hot water generator 1, 16 denotes a refrigerant vapor outlet also opened at an upper part of the evaporator / hot water generator 1, 17
Is a refrigerant evaporating nozzle opened to the evaporator / hot water generator 1, 18 is a heating source of the high temperature regenerator 4, and 19 is a solution ejection port provided on the upper part of the absorber 2.

In the apparatus of this embodiment, a container-like structure called an evaporator / hot water generator 1 is provided instead of the evaporator 29 and the water heater 23 provided in the conventional absorption refrigerator shown in FIG. ing. This is connected to the absorber 2 via the refrigerant vapor on-off valve 7 and the refrigerant vapor flow path 30, and is connected to the condenser 3 via the refrigerant vapor switching valve 10 and the refrigerant on-off valve 9.
10 is connected to the high-temperature regenerator 4 via the refrigerant on-off valve 8,
Further, it is directly connected to the fan coil 6 via a refrigerant circulation system having a refrigerant pump 14. Then, only the refrigerant circulates in the evaporator / hot water generator 1.

Next, the operation during the cooling operation will be described with reference to FIG. The solid arrows in the figure indicate the flows of the solution and the refrigerant.

In the case of the cooling cycle, the solution opening / closing valves 11 and 12 are opened and the solution pump 13 is operated. Further, the refrigerant vapor switching valve 10 switches the flow path to the condenser side. The refrigerant vapor on-off valve 7 is opened. The refrigerant on-off valve 9 is opened and the refrigerant on-off valve 8 is closed. The refrigerant pump 14 is operated.

Strong absorbent from high temperature regenerator 4 (hereinafter referred to as concentrated solution)
30 to the absorber 2 via the concentrated solution pipe 34, and the solution ejection port 19
And serves to absorb refrigerant vapor flowing from the evaporator / hot water generator 1 into the inside. The latent heat generated at this time is removed by cooling water (or cooling air) 20b.

A dilute solution that has become diluted by absorbing refrigerant vapor is a solution pump
At 13, the solution is sent again to the absorber 2, passes through the diluted solution pipe 35 and the solution on-off valve 12, exchanges heat with the solution heat exchanger 5, enters the high-temperature regenerator 4, and is again regenerated into a concentrated solution, and is regenerated as a concentrated solution To be circulated.

High-temperature refrigerant vapor separated from the absorbent in the high-temperature regenerator 4
27 is sent to the condenser 3 through the refrigerant vapor switching valve 10 and exchanges heat with the cooling water (or cooling air) 20a to be cooled and condensed into a liquid refrigerant 26 through the refrigerant on-off valve 9 to generate evaporator / hot water. Sent to the vessel 1. The refrigerant sent here is a refrigerant evaporation nozzle
It is ejected from 17 into the space inside the vessel and evaporates at the same time, taking away heat of vaporization. The refrigerant that could not evaporate is cooled by the amount deprived of heat of vaporization as a liquid and becomes a low-temperature liquid refrigerant 26,
The refrigerant is directly sent to the fan coil 6 via the generated refrigerant delivery pipe 36 by the refrigerant pump 14, cools the room to be air-conditioned, and returns to the evaporator / hot water generator 1 again via the cooling return pipe 37. Since the returned refrigerant is heated, it is ejected from the refrigerant outlet 15 and evaporates at the same time as it loses heat of vaporization, is again turned into a low-temperature liquid refrigerant 26 and is sent to the fan coil 6 to perform a cooling operation. .

Refrigerant vapor generated by flashing and evaporation in the evaporator / hot water generator 1 is sent to the absorber 2 through the refrigerant vapor flow path 30 and the refrigerant vapor opening / closing valve 7, and the concentrated solution sprayed from the solution outlet 19.
Absorbed by 30 absorbents.

Next, the operation during the heating operation will be described with reference to FIG. In the drawing, those having the same reference numerals as those in FIG. 1 indicate the same parts,
Solid arrows indicate flows of the solution and the refrigerant.

In the case of the heating cycle, the refrigerant / vapor switching valve 10 is switched to the evaporator / hot water generator 1 side so that the high temperature regenerator 4 and the condenser 3 are operated so as to be separated from each other. Also, the refrigerant vapor on-off valve 7,
The refrigerant on-off valve 9 and the solution on-off valves 11 and 12 are closed, and the solution pump 13
Is stopped, and the functions of the absorber 2, the condenser 3, and the solution heat exchanger 5 are destroyed. On the other hand, the refrigerant on-off valve 8 is opened. Those hatched by each valve in the figure indicate a closed state.

 The refrigerant pump 14 is operated.

The high-temperature refrigerant vapor 27 generated in the high-temperature regenerator 4 passes through the refrigerant vapor switching valve 10 and the refrigerant vapor pipe 33, and the evaporator / hot water generator 1
And is discharged from the refrigerant vapor outlet 16 and condensed in a space region inside the vessel to become a high-temperature liquid refrigerant. Further, the temperature of the other liquid refrigerant is raised by the condensed heat of condensation. The high-temperature liquid refrigerant 38 thus generated is sent to the fan coil 6 by the refrigerant pump 14 through the generated refrigerant delivery pipe 36, and the air-conditioned room is heated. The liquid refrigerant cooled by the heating action returns to the evaporator / hot water generator 1 through the refrigerant return pipe 37 and is ejected from the refrigerant outlet 15 into the vessel, and is heated again by the high-temperature refrigerant vapor from the high-temperature regenerator 4 to be heated by the high-temperature liquid. It becomes the refrigerant 38 and is sent to the fan coil 6 to perform heating.

The remaining liquid refrigerant in the evaporator / hot water generator 1 is a liquid refrigerant pipe 3
1. It is returned to the high-temperature regenerator 4 through the refrigerant on-off valve 8 using the head difference. As a result, the refrigerant flowing from the high temperature regenerator 4 to the evaporator / hot water generator 1 through the refrigerant vapor switching valve 10 is replenished and the concentration of the absorbent (solution concentration) in the high temperature regenerator 4 is kept constant. Then, the heating cycle is continued.

According to the present embodiment, the evaporator and the water heater are replaced with one simple container or space, and the heat can be directly transferred to and from the fan coil by the refrigerant, so that the structure including the piping can be simplified, and the cooling and heating cycle can be performed. Thermal efficiency can be improved.

The illustration of the control circuit of each operating unit in the cooling / heating switching and the cooling / heating operation control in the above embodiment is omitted.

[Effects of the Invention] As described above, according to the present invention, the evaporator and the water heater can be replaced by a structure having one simple space region, and the refrigerant can directly transfer heat to and from the fan coil. In addition, it is possible to provide an absorption refrigerator having a cooling / heating refrigerant circulation system which can simplify the structure including piping and improve the thermal efficiency as a cooling / heating cycle.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a cooling cycle of an absorption refrigerator according to one embodiment of the present invention, FIG. 2 is a system diagram showing a heating cycle of the absorption refrigerator, and FIG. FIG. 4 is a system diagram showing a cooling cycle of the absorption refrigerator, and FIG. 4 is a system diagram showing a heating cycle of the absorption refrigerator. DESCRIPTION OF SYMBOLS 1 ... Evaporator and hot water generator, 2 ... Absorber, 3 ... Condenser, 4 ... High temperature regenerator, 5 ... Solution heat exchanger, 6 ... Fan coil, 7 ... Refrigerant vapor on-off valve , 8,9 ... refrigerant on-off valve, 10 ... refrigerant vapor switching valve, 11, 12 ... solution on-off valve, 13
... solution pump, 14 ... refrigerant pump, 15 ... refrigerant outlet, 16 ... refrigerant vapor outlet, 17 ... refrigerant evaporation nozzle,
30 ... refrigerant vapor flow path, 31, 32 ... liquid refrigerant piping, 33 ... refrigerant vapor piping, 34 ... concentrated solution piping, 35 ... dilute solution piping, 36
…… Generating refrigerant delivery pipe, 37 …… Refrigerant return pipe.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Imura 502 Kandate-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. Inside the Machinery Research Laboratory (72) Inventor Tamio Shimizu 603, Kandamachi, Tsuchiura-shi, Ibaraki Prefecture Inside the Tsuchiura Plant, Hitachi, Ltd. (56) References JP-A-54-116762 (JP, A) JP-A-1-310272 (JP) , A)

Claims (7)

(57) [Claims] An at least one regenerator, a condenser, and an absorber, a solution pipe system connecting the regenerator and the absorber, a solution pump, a solution on-off valve, a solution heat exchanger, and a fine coil. An absorption refrigerator having a refrigerant circulation system for cooling and heating provided with a refrigerant circulation system having a refrigerant circulation system, wherein the refrigerant circulation system has a space region for generating a low-temperature refrigerant or a high-temperature refrigerant to be supplied to the fan coil. A liquid refrigerant pipe having a refrigerant on-off valve and connected to the condenser; and a refrigerant having a refrigerant vapor on-off valve and communicating with the absorber. A liquid refrigerant pipe having a vapor flow path, a refrigerant on-off valve and connected to the regenerator, and a refrigerant vapor pipe having a refrigerant vapor switching valve and connected to the regenerator, respectively. For air conditioning Absorption refrigerating machine equipped with a medium circulation system. 2. An apparatus according to claim 1, wherein an opening end at which the liquid refrigerant pipe from the condenser is connected to the evaporator / hot water generator is provided with a refrigerant evaporation nozzle. An absorption refrigerator equipped with a refrigerant circulation system for cooling and heating. 3. The cooling circulating system having a fan coil according to claim 1, wherein a generated refrigerant delivery pipe is connected to a lower portion of the evaporator / hot water generator, and the evaporator / hot water generator is provided. An absorption refrigerator equipped with a refrigerant circulation system for cooling and heating, characterized in that an outlet of a return pipe is connected to an upper part of the pipe and a refrigerant pump is provided in a refrigerant pipe. 4. The cooling device according to any one of claims 1 to 3, wherein during cooling operation, the refrigerant vapor switching valve of the refrigerant vapor pipe is switched to the condenser side to switch the regenerator to the evaporator / hot water. Shut off the inflow of refrigerant vapor into the generator, open the solution on / off valve of the solution piping system to operate the solution pump, close the refrigerant on / off valve of the liquid refrigerant piping returning from the evaporator / hot water generator to the regenerator, The refrigerant on-off valve of the liquid refrigerant pipe leading from the condenser to the evaporator / hot water generator is opened, and the liquid refrigerant flowing into the evaporator / hot water generator is allowed to evaporate at the nozzle for evaporating the refrigerant. An absorption refrigerator including a cooling / heating refrigerant circulation system, wherein a control circuit is configured to flow through the fan coil by a circulation system. 5. The solution piping system according to any one of claims 1 to 3, wherein during a heating operation, the refrigerant vapor switching valve of the refrigerant vapor piping is switched to the evaporator / hot water generator side. Close the solution on / off valve and stop the solution pump, close the refrigerant on / off valve of the liquid refrigerant pipe connecting the condenser and the evaporator / hot water generator, and connect the refrigerant between the absorber and the evaporator / hot water generator. Close the refrigerant vapor on-off valve of the vapor flow path, open the refrigerant on-off valve of the liquid refrigerant pipe connecting the regenerator and the evaporator / hot water generator, and send the high-temperature refrigerant vapor of the regenerator to the evaporator / hot water generator. An absorption refrigerator having a cooling and heating refrigerant circulation system, wherein a control circuit is configured to guide the generated high-temperature refrigerant to a fan coil by a refrigerant circulation system. 6. The cooling device according to any one of claims 2 to 4, wherein during cooling operation, the refrigerant vapor switching valve of the refrigerant vapor pipe is switched to the condenser side to switch the regenerator to the evaporator / hot water. Shut off the inflow of refrigerant vapor into the generator, open the solution on / off valve of the solution piping system to operate the solution pump, close the refrigerant on / off valve of the liquid refrigerant piping returning from the evaporator / hot water generator to the regenerator, The refrigerant on-off valve of the liquid refrigerant pipe leading from the condenser to the evaporator / hot water generator is opened, and the liquid refrigerant flowing into the evaporator / hot water generator is allowed to evaporate at the nozzle for evaporating the refrigerant. An absorption refrigerator including a cooling / heating refrigerant circulation system, wherein a control circuit is configured to flow through the fan coil by a circulation system. 7. The method according to claim 2, wherein during the heating operation, the cooling steam switching valve of the refrigerant steam pipe is switched to the evaporator / hot water generator, Close the solution on / off valve to stop the solution pump, close the refrigerant on / off valve of the liquid refrigerant pipe connecting the condenser and the evaporator / hot water generator, and connect the refrigerant vapor between the absorber and the evaporator / hot water generator. Close the refrigerant vapor on-off valve of the flow path, open the refrigerant on-off valve of the liquid refrigerant pipe connecting the regenerator and the evaporator / hot water generator, and transfer the high-temperature refrigerant vapor of the regenerator to the evaporator / hot water generator. An absorption refrigerating machine having a cooling and heating refrigerant circulation system, wherein a control circuit is configured to guide the generated high-temperature refrigerant to flow through a fan coil by a refrigerant circulation system.