JPH0719657A - Absorption type refrigerator - Google Patents

Abstract

PURPOSE:To provide an absorption type refrigerator which is stably operated in a wide operating range. CONSTITUTION:An absorption type refrigerator 23 comprises a regenerator 1 having a cooling burner 2 as a heat source, an absorber 7 in which dense solution is supplied from the generator 1 through a U-shaped sealing tube 8, a condenser 3 communicating with the regenerator 1, and an evaporator 5, wherein the pressure or the temperature of the regenerator 1 or the condenser 3 is controlled according to a predetermined linear equation to stably supply dense solution of the regenerator to the absorber 7 through the tube 8. The coefficients of the equation are stored in the form corresponding to various operating conditions in a table, and the coefficients of the equation are determined in response to the condition based on the table. Thus, since the equation for determining the set temperature of the condenser 3 is so selected as to become optimum in the form corresponding to various condition, its operating range is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption type refrigeration system capable of stable operation in a wide range of operation areas.

[0002]

2. Description of the Related Art In controlling the pressure of a condenser in a conventional absorption refrigeration system, a condensation temperature is detected by a temperature sensor composed of a thermistor provided at the bottom of the condenser, and a primary expression Tcs = AG + B ( However, Tcs was controlled according to the preset temperature of the condenser, A and B are coefficients, and G is a load factor (see Japanese Patent Application No. 4-190385).

[0003]

However, in this case, the coefficients A and B in the above-mentioned primary equation are set to various operating conditions such as resistance between the regenerator and the absorber, operating conditions, or changes in outside air. Since it is a constant set regardless of, the solution may mix into the condenser and cause unstable operation.

In view of the above circumstances, the present invention has an object to provide an absorption type refrigerating apparatus capable of expanding a stable operating region by making it possible to select a function such as a linear expression according to operating conditions. And

[0005]

That is, according to the present invention, a regenerator (1) having a heating device (2) as a heat source and a U-type regenerator is used.
In an absorption refrigeration system (23) comprising an absorber (7) to which a concentrated solution is supplied via a seal pipe (8), a condenser (3) communicating with the regenerator, and an evaporator (5) ,
Control the pressure or temperature of the regenerator or the condenser according to a predetermined function (for example, a linear equation) so that the concentrated solution of the regenerator is stably supplied to the absorber through the U-seal tube. And a memory means (19d) in which the function is stored as a table (TAB) in a form corresponding to various operating conditions, and based on the table stored in the memory means. Function determining means (19e) for determining the function according to operating conditions.

[0006]

With the above-mentioned structure, the present invention provides a condenser (3).
The function such as a linear equation that determines the set temperature (Tcs) of the above-mentioned function acts so as to be optimal in a form corresponding to various operating conditions.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing an embodiment of an absorption refrigeration system according to the present invention, FIG. 2 is a control block diagram of a control device for the absorption refrigeration system shown in FIG. 1, and FIGS. 3 and 4 are solution circulation control. FIG. 5 is a flow chart showing an example of a program, and FIG. 5 is a schematic diagram showing an example of a table in which coefficients in a linear expression representing the relationship between the heating amount of the cooling burner and the set temperature of the condenser are stored.

The absorption refrigerating apparatus 23 according to the present invention is shown in FIG.
As shown in FIG.
Has a regenerator 1 provided with a cooling burner 2 on the lower side. A condenser 3 communicating with the regenerator 1 is disposed above the regenerator 1, and a refrigerant tank 6 is connected to the condenser 3 via a refrigerant pipe 4. A temperature sensor 10 including a thermistor is attached to the lower portion of the condenser 3. The evaporator 5 is disposed above the refrigerant tank 6, and the evaporator 5
An absorber 7 is disposed on the left side of FIG. The absorber 7 is connected to a U-seal pipe 8 from the regenerator 1, and a solution heat exchanger 9 is provided in the middle of the U-seal pipe 8.
Is provided. In addition, the U seal tube 8 has a vacuum valve 24
The solution tank 12 is installed via the. The solution tank 12 is connected to the regenerator 1 via a dilute solution pipe 13, and a pump 25 and the solution heat exchanger 9 are provided in the middle of the dilute solution pipe 13. Further, on the left side of the regenerator 1 in FIG. 1, a hot water heat exchanger 16 having a heating burner 17 is arranged in parallel on the lower side, and exhaust gas is provided on the upper side of the regenerator 1 and the hot water heat exchanger 16. The hood 18 is worn.

A blower fan 21 is installed in the vicinity of the condenser 3 and the absorber 7 so as to cool the condenser 3 and the absorber 7. A cooling water pipe 30 capable of discharging cooling water for cooling the absorber 7 is connected to the absorber 7, and a flow valve 31 is provided in the middle of the cooling water pipe 30.

Further, the outdoor unit 27 has a control device 19, and the control device 19 is, as shown in FIG.
9a. The main controller 19a is provided with a concentrated solution amount controller 19c, a table memory 19d, and a bus line 19b.
The coefficient determination unit 19e and the temperature sensor 10 are connected, and the concentrated solution amount control unit 19c is connected to the cooling burner 2
Are connected.

On the other hand, a plurality of indoor units 28, 29, ... Are installed on the right side of the outdoor unit 27 in FIG. 1, and these indoor units 28, 29 ,. 1
It is connected to 6 by a cold water pipe 14.

Since the absorption refrigerating apparatus 23 according to the present invention has the above-described structure, when the absorption refrigerating apparatus 23 is in the cooling operation, first, the solution in the regenerator 1 is boiled by heating the cooling burner 2. , After the refrigerant vapor is guided to the condenser 3,
It becomes a refrigerant liquid by condensing. This refrigerant liquid accumulates in the refrigerant tank 6, is fed from the refrigerant pump 22 to the evaporator 5, cools the cold water flowing through the cold water pipe 14 by the latent heat generated at the time of the spraying, and the generated refrigerant vapor is communicated by the absorber 7. Regenerator 1
A refrigeration cycle is constructed in which the solution is absorbed by spraying a concentrated solution separately guided from the above and collected as a dilute solution in the solution tank 12 and returned to the regenerator 1.

When the concentrated solution is stably supplied from the regenerator 1 to the absorber 7, the temperature (or pressure) of the condenser 3 communicating with the regenerator 1 is maintained within a predetermined range.
That is, in order to stably and normally operate the absorption refrigeration system 23, it is necessary to set the pressure of the condenser 3 (pressure of the regenerator 1) to a pressure that overcomes the flow resistance of the concentrated solution and flows. The concentrated solution flowing through the U-seal pipe 8 by the pressure of the condenser 3 has an operating limit (upper limit at which the U-seal is cut off) for blowing the concentrated solution and a lower limit at which the concentrated solution does not flow. In order to control the pressure of the condenser 3, it is important to maintain this pressure between the upper limit at which the U-seal of the concentrated solution is cut off and the lower limit at which the concentrated solution stops flowing.

Here, in controlling the pressure of the condenser 3, the main control unit 19a of the control device 19 has a concentrated solution amount control unit 19c.
In response, the concentrated solution of the regenerator 1 is instructed to be controlled so as to be stably supplied to the absorber 7 through the U seal tube 8.
In response to this, the concentrated solution amount control unit 19c detects the temperature of the condenser 3 with the temperature sensor 10 attached to the lower portion of the condenser 3, and the linear expression Tcs = AQg + B (where Tcs is Control is performed in accordance with the set temperature of the condenser, A and B are coefficients, and Qg is a heating amount. That is, if the air volume is controlled by appropriately changing the rotation speed of the blower fan 21 so that the temperature detected by the temperature sensor 10 becomes the set temperature Tcs determined by the refrigeration load, the refrigerant temperature of the condenser 3 changes, and this condensation temperature Since the pressure of the condenser 3 changes in accordance with the change of, the pressure of the regenerator 1 communicating with the condenser 3 can be changed.

Moreover, the pressure control of the condenser 3 is controlled by the regenerator 1.
According to various operating conditions such as resistance between the absorber and the absorber 7, operating conditions, and changes in the outside air, the coefficients A and B in the above-described linear equation are used.
Is appropriately performed, so that stable cooling operation can be performed. That is, the main control unit 19a of the control device 19 commands the coefficient determination unit 19e to determine the optimum coefficients A and B according to the operating conditions. In response to this, the coefficient determination unit 19e reads the table TAB as shown in FIG. 5 from the table memory 19d, refers to the table TAB, and refers to the coefficient A corresponding to the operating conditions C1, C2, ..., C6 at that time. , B is determined. If you want to flow the solution at an appropriate flow rate,
When the coefficients A and B are changed, the heating amount Qg is also changed.

In the above embodiment, the heating amount Q
Although the case where the function relating g to the set temperature Tcs of the condenser is a linear expression (Tcs = AQg + B) has been described, the present invention describes that the function is a function other than the linear expression (for example, 2
Needless to say, it is also applicable to the case of the following equation or cubic equation).

[0018]

As described above, according to the present invention,
A regenerator 1 using a heating device such as a cooling burner 2 as a heat source,
In the absorption refrigeration system 23 including an absorber 7 to which a concentrated solution is supplied from the regenerator 1 via a U-seal tube 8, a condenser 3 communicating with the regenerator 1, and an evaporator 5, The pressure or temperature of the condenser 1 or the condenser 3 is adjusted to the regenerator 1
Concentrated solution amount control unit 19c, etc., which controls the concentrated solution according to a predetermined function (for example, a linear expression) so that the concentrated solution is stably supplied to the absorber 7 through the U-seal tube 8. Means is provided, and memory means such as a table memory 19d in which the function is stored as a table TAB in a form corresponding to various operating conditions is provided, and the function is set as the operating condition based on the table TAB stored in the memory means. Since the function determining means such as the coefficient determining unit 19e for determining the temperature according to the present invention is provided, the function such as a linear expression that determines the set temperature Tcs of the condenser 3 is optimal in a form corresponding to various operating conditions. The absorption type refrigerating device 2 that can be stably operated in a wide range of operation region
3 can be provided.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of an absorption refrigeration system according to the present invention.

FIG. 2 is a control block diagram of a control device of the absorption refrigeration system shown in FIG.

FIG. 3 is a flowchart showing a part of an example of a solution circulation control program.

FIG. 4 is a flowchart showing the rest of the solution circulation control program shown in FIG.

FIG. 5 is a schematic diagram showing an example of a table in which coefficients in a linear expression representing a relationship between a heating amount of a cooling burner and a set temperature of a condenser are stored.

[Explanation of symbols]

 1 ... Regenerator 2 ... Heating device (burner for cooling) 3 ... Condenser 5 ... Evaporator 7 ... Absorber 8 ... U seal tube 19c ... Concentrated solution amount control means (concentrated solution amount control unit) ) 19d ... Memory means (table memory) 19e ... Function determining means (coefficient determining unit) 23 ... Absorption type refrigerating apparatus

Front page continuation (72) Inventor Yasuo Takase 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Shozo Kato 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Kazuhiro Tajima 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Tetsuo Miyamoto 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A regenerator using a heating device as a heat source, an absorber to which a concentrated solution is supplied from the regenerator through a U-seal tube, a condenser in communication with the regenerator, and an evaporator. In an absorption refrigeration system, the pressure or temperature of the regenerator or the condenser is controlled according to a predetermined function so that a concentrated solution of the regenerator is stably supplied to the absorber through the U-seal pipe. Concentrated solution amount control means is provided, memory means in which the function is stored as a table in a form corresponding to various operating conditions is provided, and the function is determined according to the operating condition based on the table stored in the memory means. An absorption type refrigerating apparatus configured by providing function determining means for performing the function.