JPH0663672B2 - Double-effect absorption chiller / heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a double-effect absorption chiller-heater, and more particularly, to efficiently recover exhaust gas heat quantity during both cooling and heating operations to improve cooling and heating efficiency. It is related to the system configuration to improve.

[Conventional technology]

An example of a conventional double-effect absorption chiller / heater is shown in FIG. In this conventional example, the heat quantity of exhaust gas released from the heating source 12 through the exhaust circuit 60 is recovered by heat exchange with the solution. That is, the dilute solution exiting the absorber 44 is split after passing through the low temperature heat exchanger 42, and a part of the diluted solution is passed through the high temperature regenerator 10.
To the low temperature regenerator 22. The dilute solution directed to the high temperature regenerator 10 is split again before the high temperature heat exchanger 36 and enters the high temperature heat exchanger 36 and the exhaust gas heat exchanger 66.
The rare solution whose exhaust gas heat quantity is recovered by the exhaust gas heat exchanger 66 is
Combined with the dilute solution from the high temperature heat exchanger 36, the high temperature regenerator 1
It flows into 0.

In this conventional example, the dilute solution was caused to flow in parallel to the high temperature heat exchanger 36 and the exhaust gas heat exchanger 66 to recover the exhaust gas heat quantity.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional technique, when a large amount of the dilute solution is caused to flow through the exhaust gas heat exchanger 66 during the cooling operation, the temperature of the dilute solution from the exhaust gas heat exchanger 66 decreases, and further, the temperature of the high temperature heat exchanger 36 increases. Since the amount of heat exchange also decreases, the amount of heat recovered from the exhaust gas cannot be used efficiently for improving performance. Therefore, the exhaust gas temperature must be lowered in order to reduce the amount of dilute solution to the exhaust gas heat exchanger 66 and increase the amount of heat recovered from the exhaust gas. Under such circumstances, the exhaust gas heat exchanger 66 becomes large, and the drift of the solution easily occurs in the exhaust gas heat exchanger 66, so that the possibility of crystallization of the solution by local heating increases.

On the other hand, during the heating operation, since the high temperature heat exchanger 36 does not function as a heat recovery device, it is not necessary to divide the dilute solution in parallel, and the flow velocity in the exhaust gas heat exchanger 66 is increased to improve the heat exchange efficiency. Better will improve heating efficiency. However, for that purpose, an electromagnetic valve or the like for changing the solution flow rate in the exhaust gas heat exchanger 66 between the cooling operation and the heating operation is required. Further, when the valve is not provided, the solution in the exhaust gas heat exchanger 66 may drift and crystallize as in the cooling operation.

An object of the present invention is to efficiently recover the exhaust gas heat quantity without using a valve or the like that changes the solution inflow into the exhaust gas heat exchanger between the cooling operation and the heating operation, and improve the cooling and heating efficiency. It is to provide a heavy-effect absorption chiller-heater.

[Means for Solving the Problems]

The present invention, in order to achieve the above object, a high temperature regenerator having a heating source for heating a dilute solution, a separator for separating the dilute solution heated in the high temperature regenerator into a refrigerant vapor and an intermediate concentration solution, A high-temperature heat exchanger that exchanges heat between the intermediate-concentration solution from the separator and the dilute solution that flows into the high-temperature regenerator, and the refrigerant that is introduced from the separator heats the intermediate-concentration solution that flows from the high-temperature heat exchanger to produce a refrigerant. A low-temperature regenerator that separates into a vapor and a concentrated solution, a condenser that condenses the refrigerant vapor from the low-temperature regenerator, and a low-pressure evaporator that disperses and evaporates the liquid refrigerant condensed by the condenser to cool the cooling water. , The low-temperature heat exchanger that cools the concentrated solution that flows from the low-temperature regenerator by exchanging heat with the dilute solution that flows into the high-temperature heat exchanger, and the refrigerant vapor that flows from the evaporator by spraying the concentrated solution from the low-temperature heat exchanger. An absorber that absorbs it into a dilute solution, It consists of a circulation pump that pumps the dilute solution generated in the collector to the high temperature regenerator through the low temperature heat exchanger and the high temperature heat exchanger, splits it at the outlet side of the low temperature heat exchanger, and sends part of it to the low temperature regenerator In a double-effect absorption chiller-heater, an exhaust gas heat exchanger for exchanging heat between the dilute solution leaving the low temperature heat exchanger and the exhaust gas of the heating source is provided between the low temperature heat exchanger and the high temperature heat exchanger. We propose a double-effect absorption chiller / heater installed in series.

[Action]

In the present invention, since the exhaust gas heat exchanger is provided in series between the low temperature heat exchanger and the high temperature heat exchanger, during the cooling operation, the solution flow rate through the exhaust gas heat exchanger is the same as the conventional parallel system. Compared to this, the heat exchange efficiency is increased, the exhaust gas heat exchanger can be made smaller, and crystallization due to uneven flow of the solution is less likely to occur.

In the heating operation, as in the cooling operation, the solution flow rate of the exhaust gas heat exchanger is large, so that the heat exchange efficiency is good. Moreover, it is not necessary to provide a solenoid valve or the like, and exhaust gas heat recovery can be performed in the same circuit as during cooling operation.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIG. In the figure, 10 is a high temperature regenerator that heats a dilute solution by heat from a heating source 12 to generate a refrigerant vapor, 16 is a separator that separates an intermediate concentration solution from the high temperature regenerator 10 and a refrigerant vapor, and 22 is a high temperature A low temperature regenerator that generates a refrigerant vapor by heating an intermediate-concentration solution using the refrigerant vapor from the regenerator 10 as a heating source, and 26 cools the condensed water of the refrigerant vapor used as a heating source in the low temperature regenerator 22 and the low temperature regenerator. A condenser for condensing the refrigerant vapor generated in 22 and 34 a condenser 26
A low-temperature evaporator that sprays the liquid refrigerant condensed in step S1 and evaporates it with the heat from the hot / cold water heat exchanger 32;
A high temperature heat exchanger for exchanging heat between the medium-concentration solution from C. and the dilute solution flowing into the high temperature regenerator 10, and 42 is a low temperature regenerator
The low temperature heat exchanger that cools the concentrated solution that has flowed into the high temperature heat exchanger 36 by exchanging heat with the diluted solution that flows into the high temperature heat exchanger 36. An absorber for absorbing a dilute solution, 46 is a cooling water heat exchanger for removing the heat of absorption in the absorber 44, 50 is a cooling water heat exchanger for removing the heat of condensation in the condenser 26, and 54 is an absorber 44. A circulation pump that pressure-feeds the resulting diluted solution to the high temperature regenerator 10 via the low temperature heat exchanger 42 and the high temperature heat exchanger 36, 56 is a cooling / heating switching valve, and 60 is an exhaust circuit of the heating source 12.

The present embodiment is different from the conventional example shown in FIG. 2 in that instead of the exhaust gas heat exchanger 66 arranged in parallel with the high temperature heat exchanger 36, a low temperature heat exchanger 42 and a high temperature heat exchanger 36 are provided. The point is that the exhaust gas heat exchanger 70 is provided in series.

In addition, 14, 18 and the like are pipes for connecting the respective devices.

The present embodiment having the above-mentioned configuration operates as follows.

<During Cooling> During cooling, the dilute solution in the high temperature regenerator 10 is heated by the heating source 12 and reaches a high temperature and enters the separator 16.

The separator 16 separates the high-temperature dilute solution into a refrigerant vapor and an intermediate-concentration solution, and uses the vapor pipe 18 to separate the refrigerant vapor into the low-temperature regenerator 2
2 and the intermediate concentration solution is sent to the high temperature heat exchanger 36 through the liquid sending pipe 20. The intermediate-concentration solution that has entered the high-temperature heat exchanger 36 exchanges heat with the dilute solution sent to the high-temperature regenerator 10 to loosen the dilute solution, and then enters the low-temperature regenerator 22 through the outlet pipe 38.

The refrigerant vapor that has entered the low temperature regenerator 22 through the vapor pipe 18 is
The intermediate concentration solution from the high temperature heat exchanger 36 is heated and guided to the condenser 26 through the outlet pipe 24. The intermediate concentration solution in the low temperature regenerator 22 is heated to become a concentrated solution and a refrigerant vapor. The refrigerant vapor is guided to the condenser 26 by the vapor pipe 28, and the concentrated solution is supplied to the low temperature heat exchanger 42 by the concentrated solution pipe 40.
Be led to.

The refrigerant vapor that has entered the condenser 26 is cooled by the cooling water heat exchanger 50, becomes a liquid refrigerant, and is sprayed from the spray pipe 30 into the low-pressure evaporator 34. The liquid refrigerant dispersed in the evaporator 34 evaporates while cooling the cooling water flowing in the cold / hot water heat exchanger 32, and flows into the absorber 44.

On the other hand, the concentrated solution introduced from the low temperature regenerator 22 to the low temperature heat exchanger 42 is heat-exchanged with the dilute solution pressure-fed to the low temperature heat exchanger 42 by the circulation pump 54 and cooled, and then the absorber 4
Sprinkled in 4. The concentrated solution sprayed in the absorber 44 is cooled by the cooling water heat exchanger 46 and absorbs the refrigerant vapor flowing from the evaporator 34 to become a dilute solution. This dilute solution is sent again to the high temperature regenerator 10 by the circulation pump 54 via the low temperature heat exchanger 42, the exhaust gas heat exchanger 70 and the high temperature heat exchanger 36. Low temperature heat exchanger 4
A part of the dilute solution is guided to the low temperature regenerator 22 through a pipe 68 which branches off at the outlet side of 2 and communicates with the low temperature regenerator 22 to reduce the amount of the dilute solution flowing into the high temperature regenerator 10, thereby increasing the temperature of the high temperature regenerator 10.
It reduces the amount of sensible heat.

Now, paying attention to the dilute solution that flows out of the low temperature heat exchanger 42 and flows toward the high temperature regenerator 10, the exhaust circuit 60 is provided by the exhaust gas heat exchanger 70 of the present invention connected in series with the low temperature heat exchanger 42.
Exhaust heat is recovered by exchanging heat with the exhaust gas from. Then, the dilute solution exchanges heat with the intermediate concentration solution from the separator 16 in the high temperature heat exchanger 36, and then flows into the high temperature regenerator 10.

<During heating> During heating, the cooling / heating switching valve 56 is opened. Therefore, the hot solution from separator 16 enters absorber 44 and evaporator 34 via line 58.

Then, hot water is obtained from the cold / hot water heat exchanger 32. The diluted solution that has undergone heat exchange is supplied to the high temperature regenerator 10 by the circulation pump 54.
All through the exhaust gas heat exchanger 70,
Recover exhaust heat.

〔The invention's effect〕

According to the present invention, since the exhaust gas heat exchanger is provided in series between the low temperature heat exchanger and the high temperature heat exchanger, the following effects can be obtained.

(1) During cooling operation, the flow rate of the solution flowing through the exhaust gas heat exchanger is larger than that in the conventional parallel system, the heat exchange efficiency is good, and the heat transfer area of the exhaust gas heat exchanger is small. Furthermore, since the flow rate of the solution is large, the crystallization phenomenon due to the uneven flow of the solution is unlikely to occur.

(2) The heat exchange efficiency is good during the heating operation as well as during the cooling operation because the flow rate of the exhaust gas heat exchanger is large. At that time, it is not necessary to provide an electromagnetic valve or the like, and exhaust gas heat can be recovered in the same circuit as in the cooling operation.

[Brief description of drawings]

FIG. 1 is a system diagram showing a configuration of an embodiment of a double-effect absorption chiller-heater according to the present invention, and FIG. 2 is a system diagram showing an example of a conventional double-effect absorption chiller-heater. 10 ... High temperature regenerator, 12 ... Heating source, 16 ... Separator, 22 ... Low temperature regenerator, 26 ... Condenser, 32 ... Cold / hot water heat exchanger, 34 ... Evaporator, 36 ... High temperature heat exchanger, 42 ... Low temperature heat exchanger, 44 ... Absorber, 46, 50 ... Cooling water heat exchanger, 54 ... Circulation pump, 56 ... Cooling / heating switching valve, 60 ... Exhaust circuit, 66 ... Conventional exhaust gas heat exchanger, 70 ... Exhaust gas heat exchanger of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Kanno 4-9-4-303 Takawashi, Habikino-shi, Osaka (72) Inventor Sadahisa Takemoto 11-8 Hoenen-cho, Chikusa-ku, Aichi Prefecture (72) Inventor Masahiko Oshima 1370 Koyasu-cho, Hamamatsu City, Shizuoka Prefecture Inside the Yazaki General Stock Company (72) Inventor Tomoharu Kudo 1370 Koyasu-cho, Hamamatsu City Shizuoka Prefecture Inside the Yazaki General Stock Company (72) Inventor Takahiro Shizu Hamamatsu Shizuoka Prefecture 1370 Ichikoyasu-cho Yazaki General Stock Company (56) Reference JP 63-116066 (JP, A) JP 62-77566 (JP, A) JP 55-85856 (JP, A) Actual Kaisho 58-196762 (JP, U)

Claims (1)

[Claims] 1. A high temperature regenerator having a heating source for heating a dilute solution, a separator for separating the dilute solution heated by the high temperature regenerator into a refrigerant vapor and an intermediate concentration solution, and an intermediate concentration solution from the separator. And a high temperature heat exchanger that exchanges heat with the dilute solution that flows into the high temperature regenerator, and the intermediate concentration solution that flows from the high temperature heat exchanger is heated by the refrigerant vapor that is introduced from the separator to separate it into a refrigerant vapor and a concentrated solution. Low-temperature regenerator, a condenser for condensing the refrigerant vapor from the low-temperature regenerator, a low-pressure evaporator for spraying the liquid refrigerant condensed by the condenser to evaporate and cool the cooling water, and a low-temperature regenerator. A low temperature heat exchanger that cools the concentrated solution by exchanging heat with the dilute solution flowing into the high temperature heat exchanger,
An absorber that sprays the concentrated solution from the low-temperature heat exchanger and absorbs the refrigerant vapor that has flowed in from the evaporator to form a diluted solution, and the diluted solution generated in the absorber through the low-temperature heat exchanger and the high-temperature heat exchanger. In a double-effect absorption chiller-heater consisting of a circulation pump that sends pressure to the high-temperature regenerator and diverts it at the outlet side of the low-temperature heat exchanger and sends a part of it to the low-temperature regenerator, with the dilute solution leaving the low-temperature heat exchanger. A double-effect absorption cold / hot water machine characterized in that an exhaust gas heat exchanger for exchanging heat with the exhaust gas of the heating source is provided in series between the low-temperature heat exchanger and the high-temperature heat exchanger.