JPH0961000A - Double effect absorption water cooler water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform stable operation even when the pressure fluctuation of an absorption solution system is high by providing a sensor to measure temperature or a pressure in a high temperature regenerator and a control means to regulate a flow rate of an absorption solution through control of a flow rate regulation means in response to the measuring result of a sensor. SOLUTION: A high temperature regenerator 1 is connected to a low temperature regenerator 2 through a first needle valve V1. Further, the low temperature regenerator 2 communicates with or is connected to a condenser 3 through a fourth needle valve V4. Moreover, the condenser 3 is connected to an absorber 5 and the absorber 5 is connected to the high temperature regenerator 1 through a second needle valve V2. Further, a pressure sensor 8 is connected to the high temperature regenerator 1 and the sensor 8 is connected respectively to first and second actuators 6 and 7. The first actuator 6 is connected to a fourth valve V4 and the second actuator 7 to the first and second valves V1 and V2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-effect absorption chiller / heater equipped with a high temperature regenerator and a low temperature regenerator.

[0002]

2. Description of the Related Art In a conventional absorption chiller-heater using an aqueous solution of lithium bromide as a working medium, the internal pressure is always lower than atmospheric pressure due to the physical properties of the working medium (hereinafter referred to as "absorption solution") and legal regulations. It is known to be driven in.

On the other hand, the absorption chiller-heater normally circulates the absorption solution due to the pressure difference between the components inside the machine, but even when the load changes, the operating pressure is within the atmospheric pressure and does not change greatly. So, deal with fixed orifices etc.
Techniques for achieving relatively stable operation under various operating conditions are known.

[0004]

However, in the above technology, when a next-generation working medium having a wider working range than conventional lithium bromide is used in order to improve the performance of the heat source machine in the future, the medium From the viewpoint of physical properties, the operating condition that greatly contributes to the high performance of the heat source device is that the pressure inside the device exceeds the atmospheric pressure, that is, the maximum gauge pressure is 1 kg / cm ² G. Then, in the operation in such a high pressure region, the pressure change ratio with respect to the temperature change tends to increase sharply in view of the physical properties of the absorbing solution, as compared with the conventional operation under atmospheric pressure.

That is, under conditions where the temperature of the absorbing solution changes abruptly, such as when the load changes or when starting, the internal pressure of the machine changes greatly, and with this, referring to FIG. The pressure difference between the elements such as the high temperature regenerator 1 and the absorber 5 and the high temperature regenerator 1 also fluctuates rapidly. The main cause of this abrupt change in the pressure difference is the pressure fluctuation in the high temperature regenerator 1, which is directly influenced by the operating conditions, rather than the pressure fluctuation in the low temperature regenerator 2 which strongly depends on the cooling water temperature.

On the other hand, the circulating power of the absorption solution in the conventional absorption chiller-heater is a pressure difference between the low pressure element to the high pressure element and a pressure difference between the high pressure element and the low pressure element. It is held by orifices (11, 12, etc.) in between. This method is effective when the pressure fluctuation is small as in the conventional method, but when the high pressure operation is assumed, the pressure fluctuation due to the temperature change of the absorbing solution is large, so that the pressure difference fluctuation between the elements also occurs. When it becomes large, the circulation flow of the absorbing solution becomes unstable.

As a result, not only the cooling and heating capacity becomes unstable, but also the high temperature regenerator 1 is heated due to a decrease in the circulation amount and the material metal is corroded due to the rapid heating of the absorbing solution, and further the absorption into the refrigerant vapor path is caused. Problems such as solution mixing occur.

The present invention has been proposed in view of the above problems of the prior art, and provides a double-effect absorption chiller-heater capable of stable operation even when the pressure fluctuation of the absorption solution system of the absorption chiller-heater is large. It is intended to be provided.

[0009]

The double-effect absorption chiller-heater of the present invention is a double-effect absorption chiller-heater equipped with a high-temperature regenerator and a low-temperature regenerator. A sensor for measuring, a flow rate adjusting means interposed in the path of the absorbing solution, a control means for controlling the flow rate adjusting means in response to the measurement result of the sensor to adjust the flow rate of the absorbing solution,
And is characterized by including.

Further, in the present invention, a flow rate adjusting means is provided in the condensed refrigerant path communicating from the low temperature regenerator to the condenser,
The control means preferably controls the flow rate adjusting means interposed between the low temperature regenerator and the condenser in response to the pressure of the high temperature regenerator measured by the sensor.

According to the double-effect absorption chiller-heater of the present invention having the above-mentioned structure, the high-temperature regenerator and the high-temperature regenerator are operated when the operating range of the absorption solution or the internal pressure of the machine exceeds the atmospheric pressure. Since the amount of the absorbing solution flowing into the low temperature regenerator and flowing out from the low temperature regenerator is controlled to a desired value by the flow rate adjusting means, for example, a needle valve, the chiller-heater can be operated in a stable state.

Further, by detecting and controlling the pressure of the high temperature regenerator by controlling the needle valve which is the flow rate adjusting means interposed between the low temperature regenerator and the condenser, the pressure of the high temperature regenerator is rapidly increased. It is possible to prevent "refrigerant vapor escape" to the condenser of the refrigerant vapor when rising.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, members having the same functions as those of the conventional technique are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a block diagram of a series flow of a double-effect absorption chiller-heater according to the present invention, in which a high temperature regenerator 1 is a low temperature regenerator 2 via a first needle valve V1.
Connected to Further, the low temperature regenerator 2 includes a condensed refrigerant passage L23-1 having a fourth needle valve V4,
The refrigerant vapor path L23-2 communicates with or is connected to the condenser 3 via two paths. Further, the condenser 3 is connected to the absorber 5 via the condensed refrigerant path L34, the evaporator 4 and the refrigerant vapor path L45, and the absorber 5 is connected via the pump 19 and the second needle valve V2 to the absorption solution path. Is connected to the high temperature regenerator 1.

The high temperature regenerator 1 and the low temperature regenerator 2 are connected by a refrigerant vapor path, the low temperature regenerator 2 and the absorber 5 are connected by an absorption solution path through a second orifice 12, and the evaporator 4 is connected. A path having a pump 9 that circulates the remaining refrigerant that has not evaporated is provided.

A pressure sensor 8 is connected to the high temperature regenerator 1, and the sensor 8 includes a first actuator 6 and a second actuator 6.
, And the second actuator 7 is connected to the first and second needle valves V1 and V2, respectively.
2 respectively.

Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIG. In operation, the pressure of the high temperature regenerator 1 is first detected by the pressure gauge 8 (step S1). Based on the detected pressure, each valve determines the valve opening required to secure a desired flow rate (step S2). Then,
It is determined whether or not the valve opening is the determined throttle amount (step S3). If YES, return, and if NO, actuate actuator 7 (step S4),
It returns to step S3.

Further, referring to FIG. 3, the pressure gauge 8 detects the pressure of the high temperature regenerator 1 (step S1), and whether or not refrigerant vapor escape occurs at the standard opening of the valve V4 from the detected pressure. It is determined (step S2). NO, that is, if it does not come out, the actuator 6 is operated and the valve V4 is returned to the standard opening (step S3), YES.
If so, that is, if the refrigerant vapor is discharged, the actuator 6 is operated, the valve V4 is set to a high-pressure compatible opening (step S4), and the control is ended.

According to the embodiment shown in FIGS. 1-3, even when the pressure range of the refrigerant vapor exceeds the atmospheric pressure or the pressure fluctuation inside the machine is large, the normal and stable operation is possible. is there.

The above embodiment is not limited to the next-generation working medium in which the pressure range of the absorbing solution exceeds atmospheric pressure, and more stable operation can be ensured even in the conventional medium, which is preferable. .

FIG. 4 shows an embodiment of a parallel-flow double-effect absorption chiller / heater according to the present invention. The high temperature regenerator 1 is connected to the absorber 5 via the first needle valve V1 in the absorption solution path, and the downstream side of the first valve V1 and the low temperature regenerator 2 are connected via the third orifice 13. Then, the upstream side of the second needle valve V2 and the low temperature regenerator 2 are connected via the third needle valve V3. That is, because of the parallel flow, the paths for connecting the high temperature regenerator 1 and the low temperature regenerator 2 to the absorber 5 are provided. Also, the third needle valve V3
Are connected to the second actuator 7. Regarding other configurations and operations (or control routines), the embodiment of FIG. 4 is similar to the embodiment of FIGS. 2 and 3.

FIG. 5 shows an embodiment of a reverse-flow double-effect absorption chiller-heater, in which an absorption solution path from the absorber 5 to the low-temperature regenerator 2 via the pump 19 is provided. 2 is the same as the embodiment of the series flow except that the pump 10 and the second needle valve V2 connect the high temperature regenerator 1 and the operation is also the same. However, in the embodiment of FIG. 5, since no fixed orifice is used at all, there is an advantage that a desired flow rate can be maintained at an optimum value.

[0023]

The present invention is configured as described above,
The following excellent effects can be achieved. (1) The pressure of the high temperature regenerator is detected and the flow rate of the absorbing solution flowing into and out of the high temperature regenerator is controlled by a valve. (2) In the case of parallel flow, the amount of absorbing solution flowing into the high temperature regenerator and the low temperature regenerator is controlled by valves. (3) A valve that operates by detecting the pressure of the high temperature regenerator is provided in the condensed refrigerant path between the low temperature regenerator and the condenser so that refrigerant vapor escape does not occur even if the pressure of the high temperature regenerator increases significantly. Control. (4) Therefore, the stable operation of the absorption chiller-heater can be secured, and the working medium having the working range exceeding the atmospheric pressure can be used.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an embodiment of the present invention as an absorption chiller-heater of a series flow.

FIG. 2 is a flow chart of the control of the first and second valves of FIG.

FIG. 3 is a flowchart of control of a fourth valve of FIG.

FIG. 4 is a block diagram showing an example in the case of parallel flow.

FIG. 5 is a block diagram showing an example in the case of reverse flow.

FIG. 6 is a diagram showing an example of a conventional technique.

[Explanation of symbols]

 1 ... High temperature regenerator 2 ... Low temperature regenerator 3 ... Condenser 4 ... Evaporator 5 ... Absorber 6, 7 ... Actuator 8 ... Pressure sensor 9, 19, ...・ Pumps 11, 12, 13 ... Orifices V1, V2, V3, V4 ... Needle valves

Claims (2)

[Claims] 1. In a double-effect absorption chiller-heater equipped with a high-temperature regenerator and a low-temperature regenerator, a sensor for measuring the temperature or pressure in the high-temperature regenerator and a flow rate interposed in the path of the absorbing solution. A double-effect absorption chiller-heater comprising: an adjusting means; and a control means for controlling the flow rate adjusting means to adjust the flow rate of the absorbing solution in response to the measurement result of the sensor. 2. A low-temperature regenerator, wherein a flow rate adjusting means is provided in a condensed refrigerant path communicating from the low-temperature regenerator to the condenser, and the control means corresponds to the pressure of the high-temperature regenerator measured by the sensor. The double-effect absorption chiller-heater according to claim 1, wherein the flow rate adjusting means interposed between the condenser and the condenser is controlled.