JPH10205907A - Waste heat inputted type absorption cooling and heating machine and operating method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate without deteriorating the recovering amount of heat from an external hot heat source by a method wherein a refrigerant heat exchanger for hot heat source for effecting heat exchange between fluid, supplied from the external hot heat source, and refrigerant solution in a machine upon heating operation is provided. SOLUTION: Upon heating operation cycle, refrigerant, condensed in an evaporator 1, is guided into a refrigerant heat exchanger 21 for hot heat source by a refrigerant pump 3 through a refrigerant pump discharging refrigerant supplying valve 22 or by natural circulation or the difference of heights through an evaporator refrigerant supplying valve 23. The refrigerant heat exchanger 21 for hot heat source is connected in series to a solution heat exchanger 8 for hot heat source while medium, discharged out of the solution heat exchanger 8 for hot heat source and still hot, passes through the refrigerant heat exchanger 21 for hot heat source to return into a hot heat source. Refrigerant vapor, evaporated by the heat exchange, is guided into the evaporator 1 through a vapor pipeline 24 for hot heat source and is condensed after heating hot-water through an evaporator heat transfer tube 4, through which hot-water in the evaporator 1 is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste heat input type absorption air conditioner and a method of operating the same, which effectively uses a fluid such as hot water or low pressure steam generated from a cogeneration system or the like as a heat source of the absorption air conditioner. .

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Patent Application No. 6-73428, another heat exchanger is provided in a dilute solution line of an absorbent including a high-temperature solution heat exchanger and a low-temperature solution heat exchanger. The technology of the exhaust heat input type absorption air conditioner that performs heat exchange between the fluid supplied from the heat source outside the absorption air heater and the dilute solution flowing in the dilute solution line and effectively uses it as the heat source of the absorption air heater is known. I have.

[0003] A refrigeration cycle of a typical exhaust heat input absorption air conditioner will be described with reference to FIG. In FIG. 4, arrows indicate the directions of flows of cold water, cooling water, refrigerant, and solution. During the cooling operation, the steam valve 19 and the refrigerant blow valve 2
0 is closed. The evaporator 1 is maintained at about 1/100 atm. In this, a refrigerant (water) 2 is sprayed by a refrigerant pump 3 provided on a refrigerant pipe 13 onto an evaporator heat transfer tube 4 through which cold water flows. It takes away the heat of the cold water and evaporates to produce a cooling effect. The evaporated refrigerant vapor flows into the absorber 5 maintained at a low pressure by the cooling water, and the heat is transferred to the absorber heat transfer tube 6.
Absorbed in the aqueous lithium bromide solution sprayed on, the aqueous lithium bromide solution is diluted. This diluted solution is sent to the solution heat exchanger 8 for the hot heat source through the low temperature solution heat exchanger 17 by the solution pump 7 provided in the diluted solution pipe 14,
After being heated by an external heat source, a part is passed through the high-temperature solution heat exchanger 18 to the high-temperature regenerator 9, and the rest is supplied to the low-temperature regenerator
Sent to In the high-temperature regenerator 9, the concentrated solution is heated by a direct heat source 11 such as a burner and separated into steam and a concentrated solution. The concentrated solution passes through a high-temperature solution heat exchanger 18 and a low-temperature solution heat exchanger 17, and is concentrated by an absorbent Is sprayed on the heat transfer tube 6 in the absorber. In the low-temperature regenerator 10, the dilute solution is heated by the steam generated in the high-temperature regenerator 9 to be separated into a vapor and a concentrated solution.
Is sprayed onto the absorber heat transfer tube 6 in the absorber 5 by the concentrated solution pipe 15.

The drain heated and condensed by the low-temperature regenerator 10 is led to a condenser 12. The refrigerant vapor generated in the low-temperature regenerator 10 is condensed in the condenser 12. The condensed refrigerant (liquid refrigerant) thus produced is guided to the evaporator 1 via the condensed refrigerant pipe 16, and is sprayed to make a cycle.

Next, a heating cycle of a typical exhaust heat input type absorption cooling / heating machine will be described with reference to FIG. The device shown in FIG. 3 is identical in device to the device shown in FIG. 4, so that all reference numbers refer to parts previously described with respect to FIG. Also in FIG. 3, the arrows indicate the directions of the flows of the hot water, the refrigerant, and the solution. During the heating operation, the steam valve 19 and the refrigerant blow valve 20 are open. In the high-temperature regenerator 9, the dilute solution is heated by a direct heat source 11 such as a burner.
Separated into vapor and concentrated solution. The steam generated in the high-temperature regenerator 9 is guided to the evaporator 1 via the steam valve 19. In the evaporator 1, the steam condenses after heating the hot water on the evaporator heat transfer tube 4 through which the hot water flows. The condensed refrigerant liquid is guided to the absorber 5 through the refrigerant blow valve 20 by the refrigerant pump 3. on the other hand,
The concentrated solution concentrated in the high-temperature regenerator 9 passes through the high-temperature solution heat exchanger 18 and the low-temperature solution heat exchanger 17 and passes through the concentrated solution pipe 1.
5 sprays onto an absorber heat transfer tube 6 in the absorber 5. The solution is mixed with the refrigerant liquid condensed in the evaporator 1 and diluted in the absorber 5. This diluted solution is supplied to the diluted solution piping 14.
Low-temperature solution heat exchanger 17 by the solution pump 7
After being sent to the heat source solution heat exchanger 8 and heated by the external heat source, a part is sent to the low temperature regenerator 10 and the rest is sent to the high temperature regenerator 9 via the high temperature solution heat exchanger 18. Goes around the cycle. The dilute solution is heated by the steam generated in the high-temperature regenerator 9 in the low-temperature regenerator 10,
The concentrated solution mixed with the concentrated solution in the high-temperature regenerator 9 through the high-temperature solution heat exchanger 18 is sprayed onto the absorber heat transfer tube 6 in the absorber 5 by the concentrated solution pipe 15 through the low-temperature solution heat exchanger 17 and cycled. Go around once.

[0006]

As described above, in the exhaust heat input type absorption cooling and heating machine, the dilute solution from the absorber to the regenerator is heated by an external heat source, and the temperature of the solution is raised to recover heat. However, the temperature of the solution sent from the low-temperature solution heat exchanger 17 to the high-temperature solution heat exchanger 18 is 70 ° C. during cooling.
80 ° -85 ° C. during heating and 88 ° C. when entering the heat source solution heat exchanger 8 and about 78 ° C. when exiting. Therefore, during cooling operation with a low diluted solution temperature, heat can be relatively easily recovered from an external heat source. However, during cooling operation, since the cooling water is not flowing, the solution leaving the absorber 5 is not cooled, As mentioned earlier, the temperature is high. Therefore, the amount of heat exchange in the heat source solution heat exchanger 8 during the heating operation is small, and the energy of the heat source cannot be sufficiently utilized. For this reason, it is conceivable to increase the circulation amount of the dilute solution, but this causes a problem that the efficiency during the cooling operation decreases.

An object of the present invention is to provide an exhaust heat input type absorption cooling / heating machine which can be operated without reducing the amount of heat recovered from an external heat source even during a heating operation.

[0008]

In order to achieve the above object, an evaporator, an absorber, a condenser, a high temperature regenerator, a low temperature regenerator, a high temperature solution heat exchanger, a low temperature solution heat exchanger, a solution pump, a refrigerant The exhaust heat input type absorption cooling and heating machine according to the present invention, which is constituted by a pump and a piping system that operatively couples the pump and the pump, heats between a fluid supplied from an external heat source and a refrigerant liquid in the machine during a heating operation. Provided with a heat source refrigerant heat exchanger for performing exchange, heat exchange between an external heat source and an in-machine refrigerant having a low saturation temperature during heating operation, and recovering heat as refrigerant evaporation latent heat by evaporating the refrigerant. Is the gist.

During a heating operation, the refrigerant liquid discharged from the refrigerant pump and / or the refrigerant liquid from the evaporator are guided to the heat source refrigerant heat exchanger via a switching valve, and the heat source refrigerant heat exchange is performed. Refrigerant vapor generated in the evaporator is guided to the evaporator through an inverted U-shaped pipe. When the solution heat exchanger for the heat source is also provided as in the conventional case, the solution heat exchanger for the heat source and the refrigerant heat exchanger for the heat source are connected to the heat source in series or in parallel. Only the refrigerant heat exchanger for the heat source and only the solution heat exchanger for the heat source during cooling may be connected to the heat source. In a preferred embodiment of the present invention, the solution heat exchanger for the heat source and the refrigerant heat exchanger for the heat source are formed integrally. Since the amount of heat that can be recovered can be recovered as latent heat instead of sensible heat, a large amount of heat exchange can be obtained. In addition, since the refrigerant supplied to the heat source heat exchanger forms a single cycle between the evaporator and the heat source heat exchanger, the amount of circulation can be freely selected regardless of the heating operation. Therefore, the heat recovery amount can be freely selected.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a diagram showing an example of the configuration of a waste heat input type absorption cooling and heating device according to the present invention. The device shown in FIG. 3 includes a heat source refrigerant heat exchanger 21, a refrigerant pump discharge refrigerant supply valve 22, an evaporator. Refrigerant supply valve 23, inverted U-shaped steam pipe 24 for heat source
Is different in that it has In the heating operation cycle in this configuration, the refrigerant condensed in the evaporator 1 is supplied to the evaporator refrigerant supply valve 23 by the refrigerant pump 3 through the refrigerant pump discharge refrigerant supply valve 22 or by natural circulation, that is, by a height difference. Through the heat exchanger 21 for the heat source. The heat source refrigerant heat exchanger 21 is connected in series with the heat source solution heat exchanger 8, and the still hot medium that has exited the heat source solution heat exchanger 8 is connected to the heat source refrigerant heat exchanger 21. And returns to the heat source. Therefore, the temperature of the heat source entering the heat source refrigerant heat exchanger 21 is about 78 ° C. or lower when it comes out of the heat source solution heat exchanger 8, but during the heating operation, the refrigerant of the evaporator 1 is heated. Since the temperature of No. 2 is, for example, 55 to 60 ° C., sufficiently efficient heat exchange is performed in the refrigerant heat exchanger 21 for the heat source.
The refrigerant vapor evaporated by the heat exchange in this way is led to the evaporator 1 through the heat source steam pipe 24 and heats the hot water on the evaporator heat transfer tube 4 through which the hot water in the evaporator 1 flows. Condense. The condensed refrigerant liquid is again guided by the refrigerant pump 3 via the refrigerant pump discharge refrigerant supply valve 22 or by natural circulation to the warm heat source refrigerant heat exchanger 21 via the evaporator refrigerant supply valve 23, and goes through a cycle. .

According to the above configuration, the amount of the refrigerant circulating through the heat source refrigerant heat exchanger 21 can be freely selected because it does not involve the heating cycle, and the external heat can be recovered as the refrigerant evaporation latent heat. A large amount of heat can be recovered. Here, the heat source steam pipe 24 is formed in an inverted U-shape, but the effect is that the refrigerant of the evaporator 1 flows into the heat source refrigerant heat exchanger 21 during the cooling operation, resulting in heat loss. Plays a role in preventing.

FIG. 2 shows another example of the configuration of the exhaust heat input type absorption cooling and heating machine according to the present invention. The solution heat exchanger 8 for the heat source and the refrigerant heat exchanger 21 for the heat source are integrally formed. ing. By integrating the two heat exchangers, the installation space can be reduced. The function of each part is the same as that of the device shown in FIG.

1 and 2, the solution heat exchanger 21 for the heat source and the refrigerant heat exchanger 8 for the heat source are connected in series to the heat source, but they are connected to two independent heat sources. The heating source may be connected to the heating source via a valve so that only the heating source refrigerant heat exchanger 21 is connected during heating and only the heating source solution heat exchanger 8 is connected during cooling.

[0014]

As described in detail above, according to the present invention, 70 to 9 generated from a cogeneration system or the like are generated.
It is possible to provide an exhaust-heat-input-type absorption air conditioner that can efficiently use a fluid heat source at 0 ° C. (for example, hot water or low-pressure steam) during both the cooling operation and the heating operation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of an exhaust heat input type absorption cooling / heating machine according to the present invention.

FIG. 2 is a diagram showing another configuration example of the exhaust heat input type absorption cooling / heating machine according to the present invention.

FIG. 3 is a diagram for explaining a heating cycle of a conventional typical exhaust heat input type absorption cooling / heating machine.

FIG. 4 is a view for explaining a cooling cycle of a conventional typical exhaust heat input type absorption cooling / heating machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporator 2 Refrigerant (water) 3 Refrigerant pump 4 Evaporator heat transfer tube 5 Absorber 6 Absorber heat transfer tube 7 Solution pump 8 Heat heat source solution heat exchanger 9 High temperature regenerator 10 Low temperature regenerator 11 Direct heat source 12 Condenser 13 Refrigerant pipe 14 Dilute solution pipe 15 Concentrated solution pipe 16 Condensed refrigerant pipe 17 Low temperature solution heat exchanger 18 High temperature solution heat exchanger 19 Steam valve 20 Refrigerant blow valve 21 Refrigerant heat exchanger for hot heat source 22 Refrigerant pump discharge refrigerant supply valve 23 Evaporation Refrigerant supply valve 24 Steam piping for heat source

Continued on the front page (72) Inventor Yumi Takeuchi 2-425-702, Mitsuhashi, Omiya City, Saitama Prefecture (72) Inventor Masahiro Oka 7-14-7, Minamikoiwa, Edogawa-ku, Tokyo (72) Inventor Masaru Edera, Adachi-ku, Tokyo Flower garden 7-10-4-209

Claims (10)

[Claims] An evaporator, an absorber, a condenser, a high-temperature regenerator,
In an absorption air conditioner composed of a low-temperature regenerator, a high-temperature solution heat exchanger, a low-temperature solution heat exchanger, a solution pump, a refrigerant pump, and a piping system that couples these to operate,
An exhaust heat input type absorption cooling and heating machine further comprising a heat source-use refrigerant heat exchanger for exchanging heat between a fluid supplied from an external heat source and an in-machine refrigerant liquid. 2. The exhaust heat input type absorption cooler / heater according to claim 1, wherein the refrigerant fluid discharged from the refrigerant pump is guided to the heat source refrigerant heat exchanger via a first switching valve during a heating operation. An exhaust heat input type absorption cooling / heating machine, wherein refrigerant vapor generated in a refrigerant heat exchanger for a heat source is guided to the evaporator. 3. The exhaust heat input type absorption cooling and heating device according to claim 1, wherein the refrigerant liquid of the evaporator is guided to the heating source refrigerant heat exchanger via a second switching valve during a heating operation, and An exhaust heat input type absorption cooling / heating machine, wherein refrigerant vapor generated in a source refrigerant heat exchanger is guided to the evaporator. 4. The exhaust heat input type absorption cooler / heater according to claim 1, wherein the refrigerant for the heat source is discharged simultaneously with the refrigerant liquid discharged from the refrigerant pump and the refrigerant liquid from the evaporator through a separate valve during a heating operation. A waste heat input type absorption cooling and heating machine, wherein the cooling medium is guided to a heat exchanger, and refrigerant vapor generated in the refrigerant heat exchanger for a heat source is guided to the evaporator. 5. The exhaust heat input type absorption cooler / heater according to claim 1, wherein the refrigerant vapor generated in the heat source refrigerant heat exchanger is passed through an inverted U-shaped pipe. An exhaust heat input type absorption cooling / heating machine, which is guided to the evaporator. 6. A solution heat exchanger for a heat source for performing heat exchange between a dilute solution sent from the absorber to the high temperature regenerator and the low temperature regenerator and a fluid supplied from the external heat source. An exhaust heat input type absorption air conditioner characterized by adding. 7. The exhaust heat input type absorption cooling and heating apparatus according to claim 6, wherein the solution heat exchanger for the heat source and the refrigerant heat exchanger for the heat source are integrally formed. Heat input absorption air conditioner. 8. The exhaust heat input type absorption air conditioner according to claim 6, wherein the fluid supplied from the heat source exchanges heat with the solution heat exchanger for the heat source, and then the fluid is supplied to the heat source. An exhaust heat input type absorption cooling and heating machine characterized in that heat is exchanged in a refrigerant heat exchanger. 9. The exhaust heat input type absorption air conditioner according to claim 6, wherein the fluid supplied from the heat source is supplied to the solution heat exchanger for the heat source and the refrigerant heat exchanger for the heat source. An exhaust heat input type absorption cooling / heating machine characterized in that it is configured to be supplied in parallel via two independent valves. 10. An operation method for operating the exhaust heat input type absorption cooling / heating machine according to claim 9, wherein the heating heat source refrigerant heat exchanger is used only for heating, and the heat source solution heat exchange is used for cooling. And controlling the opening and closing of the two valves so that only the heater is connected to the heat source.