JPH071130B2 - Absorption refrigerator efficiency decrease notification device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a notification device that automatically detects an abnormal decrease in the operating efficiency of an absorption refrigerator and issues a warning.

(B) Conventional technology When a large amount of non-condensable gas exists in the machine as a cause of abnormal reduction in the operating efficiency (coefficient of performance) of the absorption chiller, a large amount of scale adheres to the heat exchanger in the machine. In this case, there is a case where a large amount of the absorbent is mixed in the refrigerant.

And, in the conventional absorption refrigerating machine, when a large amount of non-condensable gas is present in the machine, the non-condensable gas is automatically exhausted to the outside of the machine (see, for example, Japanese Patent Publication No. 58-44307). When a large amount of scale adheres to the heat exchanger in the machine, it detects it and issues an alarm (see, for example, Japanese Patent Publication No. 61-15993), when a large amount of absorbent is mixed in the refrigerant. There is known one that detects this and automatically blows the refrigerant (see, for example, Japanese Patent Laid-Open No. 61-3960).

(C) Problems to be Solved by the Invention Although the above-mentioned conventional one has an advantage that it works effectively when an abnormal reduction in the operating efficiency of the absorption refrigerator is caused by a specific request, it is caused by another factor. It has a problem that it does not work at all when it causes an abnormal decrease in operating efficiency. For this reason,
A means of equipping the absorption refrigerator with all of these conventional ones is also conceivable, but this means becomes expensive and complicated, and in the case where an abnormal decrease in operating efficiency occurs due to a cause other than the above-mentioned factors, It has the problem that it is useless.

The present invention has been made in view of the above problems, and an object thereof is to provide an inexpensive and simple device that directly detects an abnormal decrease in the operating efficiency of an absorption refrigerator and issues an alarm.

(D) Means for Solving the Problems The present invention provides, as means for solving the above problems, cold water output of an absorption refrigerator (heat absorption amount of evaporator), heat radiation amount (heat radiation amount to cooling water). A measuring instrument, a calculator that calculates the heat source input (heat input of the generator) of the absorption refrigerator by subtracting the cold water output from the heat radiation amount, and a coefficient of performance that is the ratio of the cold water output to the heat source input, that is, the operating efficiency. An efficiency calculator, an efficiency setter that sets the lower limit of operating efficiency, a determiner that compares and discriminates the calculated operating efficiency and its lower limit, and when the calculated operating efficiency is less than the lower limit The device is configured by an alarm device that issues an alarm with the determination signal of.

(E) Action In the device of the present invention, the measuring instrument, the heat source input computing unit, and the efficiency computing unit act to directly measure the running efficiency of the absorption refrigerator, and to set this action and efficiency. The function of the detector, the determiner, and the alarm function exerts a function of reliably detecting and alerting to any cause that causes an abnormal decrease in the operating efficiency of the absorption refrigerator. For this reason,
According to the present invention, it is possible to perform operation management of an absorption refrigerator with a simple and inexpensive device as compared with a conventional device equipped with various types of devices for each factor of abnormal reduction in operation efficiency.

(F) Embodiment FIG. 1 is a schematic structural explanatory view showing an embodiment of the apparatus according to the present invention. In the figure, (A) is an absorption refrigerator, which is a high temperature generator (1), a low temperature generator (2), a condenser (3), an evaporator (4), an absorber (5),
Cold, hot solution heat exchanger (6), (7), the coolant pump _{(P R)} and a solution pump _{(P A)} a refrigerant conduit (8), (9), the refrigerant liquid flows down conduit (10), refrigerant liquid recirculation pipe lines (11), (12), dilute solution pipe lines (13), (14),
The medium-concentration solution pipes (15) and (16) and the concentrated solution pipes (17) and (18) are connected to form a circulation path for the refrigerant [water] and the solution [lithium bromide aqueous solution]. ing.

(19) is the combustion heating chamber of the high temperature generator (1), (20), (2
0) ... are combustion gas passages, (21) is a low temperature generator (2) heater, (22) is a condenser (3) cooler, (23) is an evaporator (4) heat exchanger, (24) is a cooler of the absorber (5). (25) is a fuel supply passage with the flow control valve to the combustion heating chamber (V _F). (26), (27), (28) are cooling water pipes in which the coolers (24), (22) are connected in series, and the pipe (26) is provided with a temperature detector ( _STWA ). , Pipeline (2
8) is equipped with a temperature detector (S _TWC ) and a flow rate detector (S _FWB ). And, (29) and (30) are cold water pipes connected to the heat exchanger (23). Also, (S _TW1 )
Is a temperature detector provided in the cold water pipeline (29), and (S
_TW2), (S _FW) is a temperature detector provided in the cold water conduit (30), a flow detector.

(B) is a notification device that informs the operation manager when the operating efficiency of the absorption refrigerator (A) is abnormally reduced. The notifying device (B) includes the detectors (S _TW1 ). (S _TW2 ),
A cold water output measuring device (100) for calculating a cold water heat amount [heat absorption amount of the evaporator (4)] based on these detected values while receiving a signal from (S _FW ), and the detectors (S _TWA ), (S _TWC ). , (S
While receiving a signal from _FWB) absorption chillers for calculating the cooling water heat by these detected values radiation amount measuring instrument (A) (10
1) and, while receiving signals from these measuring devices, subtracting the cold water heat amount [cool water output], that is, the heat absorption amount of the evaporator (4) from the cooling water heat amount, that is, the heat radiation amount of the absorption cooler (A), ) Heat source input In other words, the heat source input calculator (102) for calculating the heat input amount of the high temperature generator (1), and cold water for the heat source input while receiving signals from this calculator and the cold water output measuring device (100). Operating efficiency calculator (103) that calculates the output ratio, that is, coefficient of performance, operating efficiency setter (104) that sets the lower limit of the coefficient of performance, and the lower limit of the coefficient of performance set by this setter and operating efficiency calculation Judgment device (10 that compares and judges the magnitude with the coefficient of performance calculated by the device (104)
5) and an annunciator (106) for issuing an alarm by the discriminating signal of the discriminator (105) when the calculated coefficient of performance is smaller than the lower limit value.

Note that, as shown in FIG. 2, the alarm device (B) is configured as a computer system in which the above-mentioned components are connected by a BUS for these access signals, and ROM, RAM, MPU [microprocessor unit], I It is made up of computer parts such as / F (interface). For example, the lower limit of the coefficient of performance is input to the RAM of the operation efficiency setting device (104) by operating the keyboard and stored as reference data. In addition, the cold water output measuring instrument (100) R
In the AM, the cold water inlet / outlet temperature and the cold water flow rate, which are every second (for example, every second) by the signals of the detectors (S _TW1 ), (S _TW2 ), and (S _FW ) are input and recorded as measurement data, and the MPU The calculated cold water inlet / outlet temperature difference and cold water output [cold water heat quantity] are recorded as measurement data. Similarly, the heat dissipation meter (10
In the RAM of 1), the detectors ( _STWA ), ( _STWC ),
The cooling water inlet / outlet temperature and the cooling water flow rate are input and recorded as measurement data by the signal of (S _FWB ), and the cooling water inlet / outlet temperature difference and the cooling water heat amount [absorption refrigerator ( The heat radiation amount in A)] is recorded as measurement data.
Then, the MPU, the ROM, the chilled water output measuring device (100) and the RAM of the heat radiation amount measuring device (101) are accessing signals, and the heat radiation amount of the absorption refrigerator (A) to the heat absorbing amount of the evaporator (4). Is calculated to calculate the heat input amount of the high temperature generator (1), that is, the heat source input of the absorption refrigerator (A), and the calculated heat source input is stored in the RAM of the heat source input calculator (102) as measurement data. It will be recorded. Moreover, the ratio of the chilled water output to the heat source input, which is calculated by the MPU, that is, the coefficient of performance, is recorded as measurement data in the RAM of the operation efficiency calculator (103). In addition,
These measurement data and measurement data can be appropriately printed out or displayed by operating the keyboard, for example, via the printout unit or the display unit of the alarm device (106). In addition, the MPU and the RAM of the operation efficiency setting device (104) access this RAM while accessing signals.
The lower limit value of the coefficient of performance, which is the reference data stored by the keyboard operation, and the magnitude of the measured coefficient of performance, which is the measurement data, are compared by the MPU calculation process, and the coefficient of performance, which is the measurement data, is lower than the lower limit When the value is small, the alarm device (106), for example, alerts the warning level and prints out or displays the performance coefficient at that time. That is, the MPU is the discriminator (1
It also has the function of 05). Although not shown, it is needless to say that the alarm device (B) is provided with a clock circuit having a crystal oscillator incorporated therein, for example.

In this way, the alarm device (B) issues an alarm when the coefficient of performance (operating efficiency) of the absorption refrigerator is measured every moment and when it reaches the lower limit set value, that is, when it abnormally drops. Therefore, the operation manager can immediately stop the operation to prevent the wasteful consumption of fuel regardless of the cause of the abnormal decrease in the operation efficiency of the absorption refrigerator, and investigate the cause of the abnormal decrease in the operation efficiency. You can also In addition, unlike the conventional one, it is not necessary to equip various types of devices for each factor of abnormal reduction in operation efficiency, and the operation management can be performed with a cheap and simple device.

(G) Effect of the Invention As described above, the present invention is capable of directly and automatically detecting an abnormal decrease in the operating efficiency of an absorption refrigerator by an inexpensive and simple device, regardless of the cause. This is of high practical value because it has the effect of notifying the operation manager, can prevent wasteful consumption of the drive heat source of the absorption refrigerator, and can perform good operation management.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view showing an embodiment of the device of the present invention, and FIG. 2 is a block diagram showing an example as a computer system of the notification device. (A) ... Absorption refrigerator, (1) ... High temperature generator, (4)
…… Evaporator, (22) …… Cooler, (23) …… Heat exchanger,
(24) …… Cooler, (S _FF ) …… Flow rate detector, (29),
(30) …… Cold water pipe, (S _TW1 ), (S _TW2 ) …… Temperature detector, (S _FW ), (S _FWB ) …… Flow rate detector,
(S _TWA ), (S _TWC ) ... Temperature detector, (100) ... Chilled water output measuring instrument, (101) ... Heat radiation amount measuring instrument, (102) ...
Heat source input calculator, (103) …… Operating efficiency calculator, (104)
...... Operating efficiency setter, (105) …… Judger, (106) ……
Alarm.

Claims (1)

[Claims] 1. An output measuring device for measuring a cold water output by calculating a cold water heat quantity while measuring a cold water inlet / outlet temperature and a cold water flow rate of an evaporator of an absorption refrigerator, and a cooling water inlet / outlet temperature and a cooling water flow rate of the absorption refrigerator. Measuring devices that calculate the cooling water heat amount while measuring and measure the heat radiation amount from the absorption refrigerator, and subtract the chilled water output from the heat radiation amount while receiving the signals from these measuring devices to enter the generator of the absorption refrigerator. A heat source input calculator that calculates the amount of heat, an efficiency calculator that calculates the operating efficiency of the absorption chiller by dividing the chilled water output by the heat source input while receiving signals from this calculator and the output measuring device, and the operating efficiency An efficiency setter that sets a lower limit, a determiner that compares the lower limit of the operating efficiency of this setter with the operating efficiency calculated by the efficiency calculator, and the calculated operating efficiency is the lower limit. Judgment when it is less than the value Of the the annunciator to emit an alarm in the determination signal, reduced efficiency informing device of the absorption refrigerator is characterized in that it is configured.