JPH01285751A - Absorption type refrigerating machine - Google Patents

Abstract

PURPOSE:To prevent a room temperature from becoming too cool or too hot caused by the value of a load by a method wherein a heating amount control valve is opened and closed by operating to estimate the change of cold water temperature after opening and closing the heating amount control valve by a controller from the cold water temperature and the changing rate of the cold water temperature in accordance with a predetermined program and operating the opening and closing temperature of the heating amount control valve, through which the cold water temperature is kept in a set range. CONSTITUTION:A controller 31 operates the changing rate of a cold water temperature (when the cold water temperature is reduced by 1 deg. during 1 minute, for example, the temperature changing rate becomes 1/60 deg/sec) based on a set temperature (5 deg.C upon temperature reduction and 15 deg.C upon increasing the temperature, for example) set in a temperature setter accommodated in the controller 31 and a detecting signal outputted by a temperature ture detector 19 and outputs a signal to open and/or close (closed when the cold water temperature is reduced) the heating amount control valve 17 in accordance with a program preset by a present cold water temperature.

Description

[Detailed Description of the Invention] Field of Industrial Application] This invention relates to an absorption refrigerating machine, particularly an absorption refrigerating machine that controls the temperature of chilled water to always be within a set temperature range regardless of the amount of load. It's about machines.

[Prior Art] An example of a conventional refrigerator of this type is shown in FIGS. 3 and 4. This example is disclosed in Utility Model Publication No. 61-35894.

In the tJSs diagram, (1) is a high-temperature i4 generator, which includes a combustion heating chamber (2) for gas, etc., and heats and separates the refrigerant from the dilute acid. (3) is a low temperature regenerator that further heats and separates the refrigerant from the regenerator (1), and the refrigerant from both regenerators (1) and (3) is cooled and liquefied by the condenser (4).

The refrigerant from the condenser (4) is sent to the evaporator (5) and is turned into cold water by the absorber (6). (7) and (8) are low temperature and high temperature heat exchangers, which are connected to the refrigerant vapor conduit (9).
, a refrigerant liquid down-flow pipe (10), a refrigerant circulator (12) with a refrigerant pump (11), a dilute acid pipe (14) with an absorption liquid pump (13), an intermediate liquid pipe (15) and a concentrated liquid pipe ( 16) are connected by piping to form a refrigeration cycle.

Reference numeral (20) denotes a cold water pipe, which is connected to an air conditioner (not shown) for indoor load and cools the room.

(17) is a heating control valve, which is attached to the fuel supply pipe (18) to the combustion heating chamber (2). A temperature detector (19) is provided on the cold water outlet side of the cold water pipe (20). (
21) is a controller that controls the refrigeration cycle.

Next, the operation of the above-mentioned conventional device will be explained.

The controller (21) takes in the signal from the temperature detector (19) and adjusts the temperature to 751 degrees, which is set by the built-in temperature setting device.
For example, if the temperature drops below 5℃, open the heating amount control valve (17),
Fuel supply to the combustion heating chamber (2) is started, and the temperature of the cold water is controlled within a certain range, for example, within a range of 5°C to 15°C.

In addition, when the chilled water temperature decreases, that is, when the chilled water'/24 degrees falls further than the set temperature of 5 degrees Celsius, for example, when it reaches 4 degrees Celsius, the refrigerant pump (11) is stopped, and when the temperature further falls below, For example, if the temperature reaches 3℃, the solution pump (
13) is stopped to prevent cold water from freezing.

The above control will be explained in detail with reference to FIGS. 4(A) to 4(C) as follows.

That is, the heating amount control valve (17) is closed at point a when the temperature reaches T2-5°C set by the temperature setting device in the controller (21) when the cold water temperature decreases.

Even after heating in the high-temperature regenerator (1) has stopped, the refrigerant evaporates due to the preheating of the solution, and the refrigerant pump (11) and absorption liquid pump (13) are also operating, so the inside of the evaporator (5) The refrigerant evaporation cycle will continue. Therefore, when the cooling load is small, the cold water outlet temperature will further decrease.

On the other hand, when the cold water temperature rises, that is, at the 0 point where the set temperature T of the temperature setting device reaches -15℃, the heating amount control valve (17
) and start heating the high temperature regenerator (1).

However, the solution temperature during the refrigeration cycle is low and the solution concentration is also decreasing, so refrigerant separation is not performed immediately after heating starts, and after the solution temperature rises by -L, the evaporation capacity in the evaporator (5) reaches its maximum. becomes. Therefore, the temperature of the cold water is controlled by the heating control valve (17).
) will rise again even after it opens. When the indoor cooling load is large, the difference between the set temperature T1 and the cold water of 78 degrees becomes large.

[Problem to be solved by the invention] Since the conventional absorption chiller is configured as described above, there is a phenomenon in which the chilled water temperature becomes lower or higher than the setting of the temperature setting device/11 depending on the load. Occur. That is, there is a problem in that the indoor temperature is either cooled down or overheated, and comfortable air conditioning cannot be achieved.

Therefore, there is a problem that the problems listed in - must be solved.

This invention was made to solve the problem,
To provide an absorption refrigerating machine which allows the room to be cooled appropriately or not to be overheated depending on the amount of load.

[Means for Solving the Problems] The absorption chiller according to the present invention is heated according to a predetermined program based on the chilled water temperature and the chilled water temperature change rate by the controller, and the heating is controlled by the chilled water temperature change after opening and closing of the control valve. The heating amount control valve is opened and closed by calculating the opening/closing temperature of the heating amount control valve at which the cold water temperature remains within the set range.

[Effect]

The controller of this invention prevents the chilled water temperature from exceeding the set temperature even after the heating amount control valve is opened, based on the chilled water temperature and the chilled water temperature change rate.
The control temperature closest to the set temperature is calculated, and the heating amount control valve is opened and closed at this control temperature.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 and FIG. 2 illustrate one embodiment of the present invention. In each figure, the same parts as in FIG. 3 or 4 are designated by the same reference numerals, and the explanation thereof will be omitted.

As is clear from comparing FIG. 1 and FIG. 3, the structure of each part of the refrigerator is the same, but the control by the controller (31)
The first set is completely different.

That is, FIGS. 2(A) to 2(C) are diagrams showing the cold water outlet temperature, the state of the heating control cell, and the cooling capacity when the cold water outlet temperature is controlled by this method.
T is the setting 1Iiii&, T, T is the heating amount control valve (1
7) indicates the temperature at which the opening and closing are performed.

The controller (31) controls the temperature set by a built-in temperature setting device (not shown) (for example, 5°C when the temperature drops and 15°C when the temperature rises).
Based on the detection signal from the temperature detector (19), the rate of change in chilled water temperature (for example, if the chilled water temperature decreases by 1 dcg per minute, the rate of temperature change is 1/60 (dcg/
5ec)), and also generates a signal to open/close the heating amount control valve (17) (close when the cold water temperature drops) according to a preset program based on the current cold water temperature.

In addition, when the temperature of the chilled water decreases, the program will set the temperature higher than the set temperature (5℃) (for example, 6℃) if the rate of change in temperature of the chilled water is large.
), and conversely, if the rate of temperature change is small, the heating amount control valve (17) is configured to close at a temperature close to the set temperature (for example, 5.5° C.).

The program also closes the heating amount control valve (17) (13).
Even if the chilled water temperature further decreases due to the operation of It is set to be calculated.

In other words, when the chilled water temperature decreases, the rate of change in the chilled water temperature (ΔT1/Δ
11) and the current cold water temperature, calculate the temperature (T2°) at which the heating* ill @ J valve (17) is closed, and when the cold water temperature reaches T2□, the heating amount control valve (17 ) and stop heating the high temperature regenerator (1).

However, since the refrigerant pump (11) and the absorption liquid pump (13) are in operation, the chilled water temperature further decreases, but the closing temperature of the heating amount control valve (17) is maintained so that the chilled water temperature does not fall below the set temperature T2. T29 is determined.

The same applies when the chilled water temperature rises, and the rate of change in chilled water temperature (ΔT /
The opening temperature "11" of the heating amount control valve (17) is calculated from Δt2) and the cold water temperature, and heating is restarted.

However, since the rise in cooling capacity is slow, the temperature of the cold water rises but does not exceed the set temperature T1.

As described above, it is possible to obtain an absorption refrigerator that appropriately cools the indoor temperature and does not cause overheating.

In addition, although the example in which the cold water temperature (19) is attached to the cold water outlet side is shown in the two consecutive embodiments, it may be installed on the cold water intake side.

[Effects of the Invention] As explained above, this invention changes the opening/closing temperature of the fuel supply valve to the high-temperature regenerator from the chilled water temperature and the rate of change of the chilled water temperature within the set temperature range when the rate of change of temperature is large. ,
Due to the configuration in which the temperature is set further apart, the cold water temperature after opening and closing the fuel supply valve does not exceed the set temperature, and regardless of changes in load, it is always controlled within the set temperature range and supplies cold 7K at a stable water temperature. be able to.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an absorption chiller according to the present invention, Fig. 2
The figure is a diagram showing temperature changes during chilled water temperature control according to the present invention, Figure 3 is a schematic 1M diagram of a conventional absorption chiller, and Figure 4 is a diagram showing temperature changes during conventional chilled water temperature control. It is. In the figure, (1) is a high-temperature regenerator, (2) is a combustion heating chamber, and (3) is a high-temperature regenerator.
) is a low temperature regenerator, (4) is a condenser, (5) is an evaporator, (
6) is an absorber, (7) is a low temperature heat exchanger, (8) is a high temperature heat exchanger, (9) is a refrigerant vapor conduit, (10) is a refrigerant liquid flow pipe, (11) a refrigerant pump, (12) is the refrigerant circulation path, (1
3) is an absorption liquid pump, (14) is a dilute acid pipe, (15) is an intermediate liquid pipe, (16) is a concentrated liquid pipe, (17) is a heating amount control valve,
(18) is a fuel supply pipe, (19) is a temperature detector, (20
) is a cold water pipe, and (21) and (31) are controllers. In addition, in the drawings, the same reference numerals indicate the same parts or the parts corresponding to Nj. Agent: Patent attorney Masuo Oiwa (and 2 others) 11] Chilled water temperature 11] Diagram showing temperature fluctuations at the time Figure 2: Schematic diagram of a conventional absorption chiller Figure 3: Conventional diagram 1j What is the temperature change of the cold water when it is heated? Line diagram shown in Figure 4, Figure 1, Indication of the incident, Patent Application No. 112936/1983, No. 2
, Kaimei's name absorption refrigerator 3, person making the amendment 5, detailed description of the invention in the specification to be amended, JI 3! . 6. Details of amendments and above

Claims (1)

[Claims] An absorption system in which a regenerator, condenser, evaporator, absorber, refrigerant pump, absorption liquid pump, etc. are connected via piping to form a circulation path for the refrigerant and absorption liquid, and a control valve is installed in the supply path for the heat source fluid of the regenerator. The type refrigerator includes a controller that is electrically connected to a temperature detector and a heat source fluid control valve provided in the cold water piping section of the evaporator, and the controller is configured to control the temperature of the cold water set by the cold water temperature setting device. Using the upper limit or lower limit of temperature, the rate of change of chilled water temperature, and each data of chilled water temperature, when the chilled water temperature rises, the heat source fluid control valve is "opened" before the chilled water temperature reaches the upper limit of chilled water temperature. Absorption refrigeration characterized in that it is configured to emit a signal to "close" the heat source fluid control valve when the chilled water temperature drops, and to "close" the heat source fluid control valve before the chilled water temperature reaches the lower limit value of the chilled water temperature. Machine.