JP2935644B2 - Absorption chiller / heater and operating method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption cooling / heating system capable of executing both a cooling operation mode and a heating operation mode and opening and closing an on-off valve provided in an internal piping system in accordance with the operation mode. The present invention relates to a water machine and an operation method thereof.

[0002]

2. Description of the Related Art An absorption chiller / heater of the type in which waste heat is selectively supplied through a branch pipe branching from a hot water supply pipe communicating with a waste heat source is disclosed in Japanese Patent Application No. Hei 10-110,867. Various things, such as 6-291845, are proposed.

[0003]

Here, both types of operation modes, a cooling operation and a heating operation, can be performed, and an absorption type of opening and closing a switching valve interposed in an internal piping system in accordance with the operation mode. In the conventional water heater, the exhaust heat has not been sufficiently utilized. On the other hand, there is a demand to effectively use exhaust heat even when hot water is supplied by a chiller / heater. However, a chiller / heater that can sufficiently cope with such a request has not yet been proposed.

The present invention has been proposed in view of the above-described problems of the prior art, and waste heat is selectively supplied through a branch pipe branched from a hot water supply pipe communicating with a waste heat source. An object of the present invention is to provide an absorption chiller / heater capable of sufficiently utilizing waste heat when hot water is supplied by an absorption chiller / heater of a type, and an operation method thereof.

[0005]

The absorption chiller / heater of the present invention can execute both a cooling operation and a heating operation, and is installed in a piping system in the absorption chiller / heater corresponding to the operation mode. A high-quality fuel supply line (21) for supplying high-quality fuel to the high-temperature regenerator (11) and a hot water supply pipe (L1) communicating with a waste heat source in the absorption chiller / heater that opens and closes the open / close valve. An exhaust heat input pipeline (L2), an on-off valve (50) interposed in the exhaust heat input pipeline (L2),
A heat exchanger (32) to which exhaust heat is supplied from the exhaust heat input pipe (L2), wherein the heat exchanger (32) includes an absorber (10) and a high temperature regenerator (11); Pipe (L1
3, L13A, L13B, L13C, and L13D) are configured to heat the solution flowing therein.

Further, the absorption chiller / heater of the present invention can execute both a cooling operation and a heating operation mode, and opens and closes an on-off valve provided in a piping system in the absorption chiller / heater in accordance with the operation mode. High-temperature regenerator (1
1) a high-quality fuel supply line (21) for supplying high-quality fuel, a waste heat input pipe (L2) branched from a hot water supply pipe (L1) communicating with an exhaust heat source, and the exhaust heat input. An on-off valve (50) interposed in the pipeline (L2) and a heat exchanger (32) to which exhaust heat is supplied from the exhaust heat input pipeline (L2).
And the heat exchanger (32) is provided with pipes (L13, L13) communicating the absorber (10) and the high temperature regenerator (11).
A, L13B, L13C, and L13D) are configured to heat the solution flowing therein, and output a signal for determining whether the absorption chiller / heater is performing the cooling operation or the heating operation. The control device includes a detecting unit and a control unit that controls opening and closing of an on-off valve disposed in the exhaust heat input pipe in response to an output signal of the operation mode determining unit.
In this case, the exhaust heat input pipe is connected to a hot water supply pipe (L1) communicating with an exhaust heat source, and the exhaust heat input pipe (L2) branches off from the open / close valve (50) in addition to the open / close valve (50). V1, V1
A) is interposed, and has a branch line (L3) branched from the exhaust heat input line (L2), and a cold and hot water line ( 6) entrance side (6I)
A heat exchanger (56) for exchanging heat with cold and hot water flowing through the air and an on-off valve (V2, V2A) are interposed. The control means (54) outputs an output signal from the operation mode detection means (52) to the output signal. In response, the on-off valves (V1, V1A) interposed in the exhaust heat input pipe (L2) and the on-off valves (V2, V2A) interposed in the branch pipe (L3) are opened and closed. It is preferred that At this time, the control means (54)
Is connected to both the heat exchanger (32) interposed in the exhaust heat input pipe (L2) and the heat exchanger (56) interposed in the branch pipe (L3) in the heating operation mode. The on-off valve (V1A) interposed in the exhaust heat input pipe (L2) and the on-off valve (V2A) interposed in the branch pipe (L3) are controlled to open and close so that the exhaust heat is input. It is preferable that it is comprised as follows.

The method for operating an absorption chiller / heater according to the present invention is the operation method for operating any of the above absorption chiller / heaters, wherein the exhaust heat input pipe branched from the hot water supply pipe communicating with the exhaust heat source is provided. And an exhaust heat inputting step of selectively supplying exhaust heat via the apparatus.

In implementing the method for operating an absorption chiller / heater of the present invention, an operation mode determination step for determining whether the absorption chiller / heater is performing a cooling operation or a heating operation, and a determination result of the operation mode determination step Controlling the opening and closing of an on-off valve interposed in the exhaust heat input pipe in response to

In the practice of the present invention, when the exhaust heat is relatively small, the on-off valve interposed in the exhaust heat input pipe is provided at a branch point or a junction of the hot water supply pipe and the exhaust heat input pipe. It is preferable that exhaust gas is supplied to the solution circulating in the chiller / heater through a heat exchanger.

On the other hand, when the exhaust heat is relatively large,
Exhaust heat is supplied to the solution in the chiller / heater through a heat exchanger in the chiller / heater, and / or a hot water line (cold / hot water line)
It is preferable to input exhaust heat to the hot water flowing into the chiller / heater through a heat exchanger interposed in the water heater.

As an operation mode detecting means for outputting a signal for determining whether the absorption chiller / heater is performing a cooling operation or a heating operation, various modes using a known technique can be considered. There is no particular limitation. As an example, a pipe system inside the water cooler / heater, in which the solution flows in one of the cooling operation mode and the heating operation mode, does not flow in the other operation mode via a flow meter. The operation mode can be determined by judging whether or not the solution is flowing based on a signal from the flow meter.

[0012]

According to the present invention having the above-described structure,
Depending on whether the heating operation is being performed or the cooling operation is being performed (operation mode), the opening and closing of an on-off valve interposed in a solution circulation piping system in the absorption chiller / heater is controlled. Thus, the absorption chiller / heater can be operated both in the cooling operation mode and the heating operation mode.

More specifically, the operation in the cooling operation mode of the present invention is described in, for example, Japanese Patent Application No. 6-29184.
It is the same as that shown in No. 5. In the case of the heating operation mode, for example, the steam generated in the regenerator is condensed in the evaporator, thereby giving heat of vaporization to the hot water flowing through the (cold) hot water line to raise the temperature of the hot water. Alternatively, the steam generated by the regenerator (high-temperature regenerator) and the heated solution are sent to the evaporator in a gas-liquid mixed state via the absorber, and the evaporator imparts the heat of vaporization of the steam to the hot water, In some cases, sensible heat is supplied from the phase solution to increase the temperature of the hot water.

In addition, according to the present invention, the exhaust heat from the exhaust heat source existing outside the absorption chiller / heater can be effectively used. For example, when the exhaust heat is relatively small, the on-off valve is provided at a branch point or a junction of the hot water supply pipe and the exhaust heat input pipe, and the solution circulating in the chiller / heater is exhausted through a heat exchanger. Apply heat. As a result of the heat input into the solution, the amount of fuel required to evaporate (or heat) the solution is reduced, and energy saving is achieved.

However, if the temperature of the hot water flowing through the hot water supply pipe is lower than the temperature of the solution circulating in the cold / hot water machine, hot water is supplied to the heat exchanger inside the cold / hot water machine via the waste heat supply pipe. The temperature of the solution circulating in the chiller / heater will decrease. In order to prevent this, it is preferable to detect the temperature of the hot water flowing in the hot water supply pipe, and to make the hot water flow to the exhaust heat supply pipe only when the temperature is equal to or higher than a predetermined value.

On the other hand, in the heating operation mode in which the amount of exhaust heat is relatively large, the flow rate of the solution in the chiller / heater is relatively small, so that the use of the exhaust heat is insufficient only by heat exchange with the solution. . Therefore, instead of supplying the exhaust heat to the solution in the chiller / heater via the heat exchanger in the chiller / heater, or inputting the exhaust heat to the solution in the chiller / heater via the heat exchanger in the chiller / heater In addition to the above, waste heat is supplied to the hot water flowing into the cold / hot water machine through a heat exchanger interposed in the hot water line (cooling / hot water line). Thereby, the temperature of the hot water before being heated by the absorption chiller / heater rises.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 6 show a first embodiment of the present invention. The absorption chiller / heater generally designated by reference numeral 20 is of a type in which exhaust heat is selectively supplied through an exhaust heat input pipe L2 branched from a hot water supply pipe L1 communicating with an exhaust heat source (not shown). is there. Then, an exhaust heat input pipe L2 for supplying exhaust heat to the heat exchanger, an on-off valve (three-way valve) 50 interposed in the pipe L2, and a high temperature regenerator (reference numeral 11 in FIG. 2-6).
And a high-quality fuel supply line 21 for burning the burner.

A more detailed configuration of the absorption chiller / heater 20 is shown in FIG.
-6. In the example shown in FIG. 2, the exhaust heat supplied via the exhaust heat input pipeline L2 is supplied to the heat exchanger 32.
To heat the solution flowing through the solution line L13 (the solution circulating in the absorption chiller / heater 20). The heated solution is further heated by the burner 100 in the high-temperature regenerator 11. Here, the cooling operation mode is substantially the same as that of Japanese Patent Application No. 6-291845 previously filed by the present applicant.

In the heating operation mode, the on-off valves V11 and V12 interposed in the steam line L11 and the solution line L12 are closed during cooling and open during heating. The refrigerant vapor heated by the high-temperature regenerator 11 to be in a gaseous state is sent to the evaporator 9 via the vapor line L11 and the open valve V11. The steam is condensed in the evaporator 9 and heats the hot water in the hot water line 6 by giving heat of vaporization. The condensed refrigerant is returned to the absorber 10 via the refrigerant liquid line L12 and the valve 12, and is mixed with the solution. Then, it flows through the solution line L13 again and is heated by the heat exchanger 32.

In the example of FIG.
2 is the same as FIG. 2 in that waste heat (warm waste water) supplied through the heat exchanger 2 is supplied to the heat exchanger 32 to heat the solution flowing through the solution lines L13A to L13D. However, the refrigerant path from the high-temperature regenerator 11 to the absorber 10 is shown in FIG.
It is different from the case. In FIG. 3-6, on-off valves V15, V18, V20, V22, V26, V3
0, V34, V36, and V42 are the on-off valves V11,
Like V12, it is closed during cooling and opened during heating.

In the example of FIG. 3, the steam generated by the high-temperature regenerator 11 is sent to the evaporator 9 via the steam lines L14 and L15 and the valve V15, and gives heat of vaporization to the hot water in the hot water line 6. After supplying heat to the hot water in the hot water line 6, the condensed refrigerant is returned to the absorber 10 via the line L18 and the valve V18. At the same time, the solution heated in the high-temperature regenerator 11 is sent (in a liquid phase) to the absorber 10 via the lines L16 and L17 and mixed with the condensed refrigerant from the evaporator 9.

In the example of FIG. 4, refrigerant vapor generated by heating in the high-temperature regenerator 11 is sent to the absorber 10 via the line L20 and the valve V20, and the heated solution (liquid phase state)
Is sent to the absorber 10 via the line L22 and the valve V22. Further, a part of the refrigerant from the absorber 10 is
The steam is conveyed to the evaporator 9 via 24, and the heat of condensation of steam and the sensible heat are given to the hot water flowing through the hot water line 6. After the heat is supplied, the condensed refrigerant is supplied to the line L26 and the valve V26.
Is returned to the absorber 10 via.

In FIG. 4, the vapor and the solution are sent to the absorber 10 through separate lines. In the example of FIG. 5, the vapor is sent through the line L28 and the solution is sent through the line L32. Are combined into a line L30, which is sent to the absorber 10 in a gas-liquid mixed state in the same line. The rest is substantially the same as FIG.

While the heated solution of FIG. 4 is sent to the absorber 10 by bypassing the low-temperature regenerator, in the example of FIG. 6, it is sent to the absorber 10 via the low-temperature regenerator. The rest is substantially the same as FIG.

In the first embodiment of the present invention shown in FIGS. 1-6, the amount of exhaust heat input through the exhaust heat input line L2 is used for heat exchange with the solution circulating in the absorption chiller / heater 20. This is a necessary degree and is a case where the heat amount is relatively small. On the other hand, when the amount of exhaust heat is relatively large, excess heat is present only by heat exchange with the solution, and the purpose of effective utilization of the exhaust heat cannot be achieved. Therefore, in the second embodiment of the present invention shown in FIGS. 7-11, instead of or in addition to the heat exchange with the solution, the hot water line 6 on the side entering the absorption chiller / heater is added. Is supplying waste heat to the hot water. 7-11, the same members as those in FIG. 1-6 are denoted by the same reference numerals.

In FIG. 7, the absorption chiller / heater according to the second embodiment of the present invention is indicated by reference numeral 70 as a whole. An operation mode determining means 52 for determining whether the absorption chiller / heater 70 is performing a heating operation or a cooling operation (ie, an operation mode) is provided. Is transmitted as an output signal to the control means 54 via the signal transmission line SLI.

The exhaust heat input pipe line L2 is connected to the hot water supply pipe L.
In addition to interposing an open / close valve (three-way valve 50) at the position where the valve 1 is joined, an open / close valve V1 is also interposed. Further, a branch pipe L3 branches from the exhaust heat input pipe L2, and the pipe L3 is provided with heat for performing heat exchange with cold and hot water flowing through an inlet side 6I of a cold and hot water line (hot water line) 6. An exchanger 56 is interposed, and an on-off valve V2 is interposed. Here, the on-off valves V1 and V2 have signal transmission lines SL1 and SL
An opening / closing control signal is output from the control means 54 via the control signal 2.

Next, the operation of the embodiment of FIG. 7 will be described with reference to FIGS. In FIGS. 8 and 9,
The three-way valve 50 is switched to the side where the hot waste water flowing through the hot water supply pipe L1 flows through the exhaust heat input pipe line L2.

First, the control means 54 controls the signal transmission line SL
The determination result of the operation mode determination means 52 is detected via I (step S1), and it is determined whether the operation mode of the absorption chiller / heater 70 is the cooling operation or the heating operation (step S2).

In the case of the heating operation ("heating" in step S2), not only the heat exchanger 32 in the chiller / heater that absorbs exhaust heat (or hot waste water) but also the heat exchanger 56 at the inlet side 6I of the chiller / heater line. The control means 54 outputs a valve-open signal to the on-off valves V1 and V2 (step S3 in FIG. 8). As a result, a part of the waste heat is supplied to the heat exchanger 32 in the absorption chiller / heater 70 to heat the solution circulating inside the chiller / heater, and the remaining waste heat is passed through the branch line L3. The chilled / hot water machine heats chilled / hot water to be heated (hot water during heating operation).

On the other hand, in the case of the cooling operation ("cooling" in step S2), the exhaust heat (or hot drainage) does not need to be supplied to the heat exchanger 56 at the inlet / outlet side 6I of the cold / hot water line. It is preferred to heat the solution circulating through. Therefore, a valve opening / closing signal is output so that the valve V1 is opened but the valve V2 is closed (step S4 in FIGS. 8 and 9).

In step S3 of FIG. 8, the exhaust heat is supplied to both the heat exchanger 32 in the absorption chiller / heater and the heat exchanger 56 at the chilled / hot water line inlet 6I. It is also possible to select that waste heat is supplied only to the heat exchanger 56 and the solution circulating in the absorption chiller / heater is not heated. FIG. 9 shows a flowchart for making such a selection. By opening only the valve V2 and closing the valve V1 (step S3A in FIG. 9), all the exhaust heat is transferred through the branch line L3. It will be supplied to the exchanger 56. As a result, during cooling, waste heat is supplied only to the solution circulating in the absorption chiller / heater, and during heating, hot water flowing through the inlet side of the chilled / hot water line (hot water to be heated)
Control is performed to supply exhaust heat only to the exhaust gas.

In the embodiment shown in FIGS. 7-9, in the heating operation mode, the control for supplying exhaust heat to both the heat exchanger 32 in the absorption chiller / heater and the heat exchanger 56 at the inlet / outlet side 6I of the chiller / heater is performed. (FIG. 8), and control (FIG. 9) of supplying exhaust heat only to the heat exchanger 56 on the inlet / outlet side 6I of the cold / hot water line can be selected. On the other hand, it is possible to control so that the exhaust heat is always supplied to both the heat exchangers 32 and 56 during the heating. FIG. 10 shows an embodiment in which such control is performed, and differs from the embodiment in FIGS. 7-9 in the branch position of the branch line L4.

The operation of the embodiment of FIG. 10 will be described with reference to FIG. 11. First, the judgment result of the operation mode judgment means 52 is detected (step S11), and the operation mode of the absorption chiller / heater 70 is changed to the cooling operation. Or heating operation (step S12).

In the heating operation ("heating" in step S12), the on-off valve V1A is closed and the V2A is opened (step S13 in FIG. 11), and the exhaust heat (or hot waste water) is transferred to the heat exchanger 32 and the heat exchanger. Is put into the container 56. As a result, part of the exhaust heat is transferred to the heat exchanger 32 in the absorption chiller / heater 70.
And heats the solution circulating in the chiller / heater, and the remaining exhaust heat heats the chilled / hot water (hot water in the heating operation) on the inlet side 6I via the branch line L4. In the case of the cooling operation ("cooling" in step S12),
The on-off valve V1A is opened and V2A is closed (step S14 in FIG. 11), and the exhaust heat (or hot waste water) is transferred to the heat exchanger 3
Put into 2.

[0036]

As described above, according to the present invention, it is possible to effectively use exhaust heat in an absorption chiller / heater capable of performing a cooling / heating operation by switching the operation mode, and thus well meets the demand for energy saving. I do.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of the first embodiment.

FIG. 3 is a block diagram showing a configuration example different from FIG. 2;

FIG. 4 is a block diagram showing a configuration example different from those in FIGS.

FIG. 5 is a block diagram showing a configuration example different from FIG. 2-4;

FIG. 6 is a block diagram showing a configuration example different from FIG. 2-5.

FIG. 7 is a block diagram showing a second embodiment of the present invention.

FIG. 8 is a diagram showing an operation flowchart of the embodiment of FIG. 7;

FIG. 9 is a view showing an operation flowchart different from that of FIG. 8;

FIG. 10 is a block diagram showing a third embodiment of the present invention.

FIG. 11 is a diagram showing an operation flowchart of the embodiment of FIG. 10;

[Explanation of symbols]

20, 70, 70A: Absorption chiller / heater 6: Cold / hot water (hot water) line 9: Evaporator 10: Absorber 11: High temperature regenerator L1: Hot water supply pipe L2 ..Pipe 50 for exhaust heat input Three-way valves V1, V2, V1A, V2A, V11, V12, V1
5, V18, V20, V22, V26, V30, V3
4, V36, V42 open / close valve 52 operating mode determining means 54 control means L3, L4 branch pipe 6I inlet side of cold / hot water line (hot water line) 32, 56 ... heat exchanger SLI, SL1, SL2, SL1A, SL2A ... signal transmission line

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-62563 (JP, A) JP-A-55-140062 (JP, A) JP-A-7-218017 (JP, A) 28870 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25B 15/00 303 F25B 15/00 306

Claims (6)

(57) [Claims] 1. An absorption chiller / heater which can execute both an operation mode of a cooling operation and a heating operation and opens and closes an on-off valve provided in a piping system in the absorption chiller / heater in accordance with the operation mode. A high-quality fuel supply line (21) for supplying high-quality fuel to the regenerator (11) and a waste heat input pipe (L2) branched from a hot water supply pipe (L1) communicating with a waste heat source.
And an on-off valve (5) interposed in the exhaust heat input pipe line (L2).
0), and a heat exchanger (32) to which exhaust heat is supplied from the exhaust heat input pipe line (L2), and the heat exchanger (32).
Are pipes (L13, L13A, L13B, L13C, L13) connecting the absorber (10) and the high-temperature regenerator (11).
D) An absorption chiller / heater configured to heat a solution flowing therethrough. 2. An absorption chiller / heater which can execute both an operation mode of a cooling operation and a heating operation and opens and closes an on-off valve provided in a piping system in the absorption chiller / heater in accordance with the operation mode. A high-quality fuel supply line (21) for supplying high-quality fuel to the regenerator (11) and a waste heat input pipe (L2) branched from a hot water supply pipe (L1) communicating with a waste heat source.
And an on-off valve (5) interposed in the exhaust heat input pipe line (L2).
0), and a heat exchanger (32) to which exhaust heat is supplied from the exhaust heat input pipe line (L2), and the heat exchanger (32).
Are pipes (L13, L13A, L13B, L13C, L13) connecting the absorber (10) and the high-temperature regenerator (11).
D) is configured to heat the solution flowing therein;
An operation mode detecting means for outputting a signal for determining whether the absorption chiller / heater is performing a cooling operation or a heating operation, and an exhaust heat input pipe in response to an output signal of the operation mode determining means. Control means for controlling the opening and closing of an interposed on-off valve; 3. The exhaust heat input pipe (L1) branched from a hot water supply pipe (L1) communicating with an exhaust heat source.
2) In addition to the on-off valve (50), another on-off valve (V1,
V1A), and the exhaust heat input pipe line (L2)
And a branch line (L3) branching from the inlet side (6) of the cold / hot water line (6).
A heat exchanger (56) for performing heat exchange with cold and hot water flowing through I) and on-off valves (V2, V2A) are interposed, and the control means (54) outputs the output of the operation mode detection means (52). In response to a signal, the on-off valves (V1, V1A) interposed in the exhaust heat input pipe (L2) and the on-off valves (V2, V2A) interposed in the branch pipe (L3) are controlled to open and close. 3. The absorption chiller / heater according to claim 2, wherein: 4. The control means (54) interposes a heat exchanger (32) interposed in a waste heat input pipe (L2) and a branch pipe (L3) in a heating operation mode. The on-off valve (V1A) and the branch line (L3) interposed in the exhaust heat line (L2) in order to control the exhaust heat to be input to both of the heat exchangers (56). The absorption chiller / heater according to claim 3, wherein the on / off valve (V2A) is controlled to open and close. 5. The operating method for operating an absorption chiller / heater according to claim 1, wherein the heating / cooling water heater is selectively operated via a waste heat input pipe branched from a hot water supply pipe communicating with the waste heat source. An operation method of an absorption chiller / heater, comprising an exhaust heat input step of supplying exhaust heat. 6. An operation mode judging step for judging whether the absorption chiller / heater is performing a cooling operation or a heating operation, and an operation through an exhaust heat input pipe in response to the judgment result of the operation mode judging step. The method for operating an absorption chiller / heater according to claim 5, further comprising a step of performing opening / closing control of a mounted on / off valve.