JPS6080062A - Controller for absorption type cold and hot medium gaining machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a control device for an absorption cold/hot medium acquisition machine such as an absorption chiller or an absorption heat pump, and particularly to a control device for managing a machine stop schedule.

(b) Prior art In general, absorption type refrigerant/hot medium acquisition machines are not operated during the day, but are operated between the start of work and the end of work when used for cooling a company or office, for example. It is customary. Therefore, it is often done to set the start and stop times of the machine using a timer to create a schedule for the operating time and the down time of the air conditioner. In addition, in the following description, in order to simplify description, the case where an absorption type cold/hot medium acquisition machine is used as a refrigerator is described.

By the way, in an absorption refrigerator (hereinafter referred to as this type of absorption refrigerator) K that uses a lithium bromide aqueous solution or other salt solution as an absorption liquid, for example, a lithium bromide aqueous solution is used to perform efficient refrigeration operation. The concentration of (absorbing liquid) is increased to about 62%. Therefore, when the operation is stopped,
If the outside temperature is low, the absorption liquid (lithium bromide aqueous solution) will crystallize, making it difficult to restart the next operation. Therefore, in this type of absorption refrigerator, it is necessary to perform an operation to lower the concentration of the absorption liquid when the operation is stopped, that is, a dilution operation.

This dilution operation is normally performed by sharing the device for ON-OFF control during partial load of the absorption refrigerator with the device for dilution operation. ) Refrigeration capacity is demonstrated, making it possible to cool businesses and offices. For this reason, conventionally, in this type of absorption refrigerator, a schedule is set in which a timer is set so that the heating of the generator is stopped at the time when the dilution operation time is subtracted from the time when the cooling is stopped. For example, if the end of work at a company or office, that is, the time when the air conditioner stops is 5:25 p.m., the dilution operation time (
For example, 25 minutes) is subtracted from the time, i.e. 5pm = 00.
The generator is scheduled to stop heating in advance. This is because by adopting such a schedule, it is possible to save the thermal energy for driving the absorption refrigerating machine, or in other words, the fuel cost by the amount of dilution operation time.

However, in such a conventional schedule, for example, in the afternoon before 5200 p.m., which is the time set in advance to stop the heating of the generator in order to start the dilution operation (hereinafter referred to as the "preset time"). 0N-OFF at 4:40
When the control device operates to the ατ side and the generator heating is stopped, the generator heating is set to stop from 4:40 p.m. until the cooling stop time [the generator heating is set to stop until operation resumes]. 5:00 p.m. (hereinafter referred to as the “set time”):
Since there is a high possibility that the air conditioner will remain turned off until 25:00, the comfortable cooling will only last until 5:10 p.m.
There was a drawback that it could not be continued.

(c) Purpose of the Invention The present invention provides an absorption chiller (absorption heat pump) of this type that saves driving thermal energy by 1° and cools (warms).
The purpose of the present invention is to provide a device that can continue comfortable cooling (heating) until the set time to stop the air conditioner (this set time).

B) Structure of the Invention The present invention is an absorption chiller (absorption heat pump) of this type that controls heating on and off of the generator during partial load, by detecting the internal temperature of the generator and transmitting it to a computer. If the detected temperature between the memorized preliminary set time for heating stop of the generator and the main set time is higher than the set value memorized in the combination, the dilution operation start time is set as the preset time. , the start time of the dilution operation is set to a later time than the preliminary set time when the value is less than the set value.

According to the present invention, when the temperature inside the generator falls below the set value between the preliminary stop time and the main stop time, the computer command to stop the i-stop device from heating is canceled in order to start the dilution operation. Therefore, during partial load, the generator heating start/stop control device (ON-OFF control device) operates to the OFF side before the preset time (for example, 5:00 p.m.) and the generator heating stops. Even in the case of
The ON-OFF control device is activated to the ON side, and heating of the generator is restarted, and the cooling (heating) ability is maintained until the main set time (for example, 5:25 p.m.). In addition, if the temperature inside the chamber is higher than the set value and the cooling (heating) capacity is sufficiently busy, a computer command to stop heating the generator will be executed in order to start dilution operation. Comfortable cooling (heating) can be continued until the main set time (for example, 5:25 p.m.) while saving heat energy for use.

(E) Embodiment FIG. 1 is a schematic structural diagram showing an embodiment of the control device of the present invention. (1) is a high temperature generator, (2) is a low temperature generator,
(3) is a condenser, (4) is an evaporator, (5) is an absorber, (
6) and (7) are low temperature and high temperature solution heat exchangers, (8) and (9)
) are pumps for refrigerant and solution, and these devices include the refrigerant flow pipe QO), the aoi refrigerant liquid flow pipe (11), the refrigerant liquid reflux pipe 02, ad, and the solution flow pipe. n:i,
(135, C4, <t!J, (15), (1) is connected to form a circulation path for refrigerant (water) and solution (lithium bromide aqueous solution).

(I6) is the heat supply for the high temperature generator (1), (1?) is the heater for the low temperature generator (2), (lυ is the heat exchanger for the evaporator (4), (19, Kan are the heat exchangers for the absorber (5) and the condenser (3), respectively, 0υ, (26 is the tube connected to the heat supply αQ, (2, the back of C2 is the heat exchanger 〃 connected to the heat exchanger 08) Pipe, +231. ).

Then, superheated steam or other high-temperature heat source fluid is passed through the pipe Cυ, heat supply αe, and pipe (21), and when this absorption type cold medium acquisition machine (hereinafter referred to as this machine) is used as a refrigerator, Heat exchanger QL tube (2i is a tube for flowing a cooling medium such as cold water or cold air (c), heat exchanger (11, tube (2a, heat exchanger -, tube d is a tube for cooling water, cooling air, etc.) When using this machine as a heat pump, run a low-temperature heat source fluid such as waste hot water or waste steam through the pipes, heat exchanger pipes, and pipes. While flowing, the tube (c), heat exchanger (19° tube d, heat exchanger -, tube d
5. The system is operated while flowing a heating medium such as hot water or hot air to obtain the heated medium. Hereinafter, in order to simplify the explanation, a case where this machine is used as a refrigerator will be explained.

(St) is a pipe (equipped with a cold water heat exchanger 081)
A detector (hereinafter referred to as a cold water temperature detector) that detects the temperature on the outlet side, and (St) is provided in the high temperature generator (1) and detects the temperature of the wall of the generator, the temperature of the absorption liquid, or the refrigerant vapor. This is a detector that detects the temperature, etc. (hereinafter referred to as a generated temperature detector). Also, (Q is central processor unit) (CPU), random access
Memory (RAM), Ri-do-on spring memory (RO)
It has a built-in computer device such as the chilled water temperature detector (sl) and generated temperature detector (S,), and can also open and close the on-off valve M or pumps (8), (
9), Ci'41, (2ω) It is a controller that sends a signal to command the start/stop of ω and also controls the opening/closing or starting/stopping of these devices. It is connected to a load-side heat exchanger (not shown) provided in the room to be cooled.

FIG. 2 is a block diagram illustrating an example of a schematic configuration of the controller (Q) shown in FIG. 1.

In FIG. 2, (S,) shown outside the dashed line frame,
(S,) are cold water temperature detector, generation temperature detector,
The device shown in the figure is an absorption refrigerator, and the devices shown within the dashed-dotted line are the components of the controller (Q), and (a) is the central processing unit (C).
PU), (b) is an external storage device, (el) (e is an amplifier that amplifies the analog signal from the detector (Sz) (St), (f+) (ft) is the amplified analog An A/D converter converts the signal into a digital signal (11 is a clock that informs the central processing unit (a) of the time, (d) is an interface. (b) is the time when the air conditioner is turned off; in other words, the time when the heating of the high temperature generator (1) is stopped until the operation of the absorption refrigerator (3) is restarted (this set time (for example, 5:25 p.m.)) , the dilution operation time (for example, 25 minutes), and the time at which the heating of the high temperature generator (1) is stopped in advance in order to start the dilution operation [preliminary set time (for example, 5:00 p.m.)]
The set temperature (hereinafter referred to as set value) in the high temperature generator (1) and the upper and lower limit set temperatures of the cold water are input, and these data are stored.

Next, an example of the control operation of the control device configured as described above will be explained with reference to the flowchart shown in FIG. 3.

When the machine starts operating (for example, starts at 9:00 a.m.), 0N-OFF control is performed according to the cooling load, just like a conventional absorption chiller, before the preset time of 5:00 p.m. be exposed. That is, when the detected temperature of the chilled water temperature detector (Sl) reaches the lower limit set temperature of chilled water, the on-off valve ■ is closed by the signal of the controller (C), and when the detected temperature of the chilled water temperature detector (Sl) reaches the upper limit set temperature of the chilled water, the signal of the controller (C1) is closed. By opening the on-off valve M, the heating on/off of the high temperature generator (1) is controlled.

Then, at 5:00 p.m., the central processing unit (a) of the controller (Q) determines whether the detected temperature of the generated temperature detector (S,) is higher than the set value.It is determined that it is higher than the set value. Then, a command signal to close the on-off valve (G) is sent from the controller (C) to this on-off valve, and the dilution operation starts at 5:00 pm in the same way as a conventional absorption refrigerator.From the set value If it is determined that the temperature is not high (determined to be below the set value), the central processing unit (a) further determines that the current time is 5:25 p.m. (this set time), which is the time to stop cooling.
Determine whether it has been reached. Current time is 5:25 p.m.
If it is determined that the current time has not reached the preset time (determined that the current time is between the preset time and the main set time), ON-OFF control is performed in the same manner as before 5200 pm (preliminary set time).

Then, by this ON-OFF control, the on-off valve M is opened, the high temperature generator (1) is heated, and the generated temperature detector (S,
) becomes higher than the set value, the central processing unit (a) determines this and closes the on-off valve with a signal from the controller (C) to stop heating the high temperature generator (1). , dilution operation is started. That is, unlike conventional absorption refrigerators, the start time of the dilution operation is changed to later than 5:00 p.m. Note that when it is determined that the current time has reached 5:25 p.m., the dilution operation is started at this point.

Then, when the dilution operation is started, the central processing unit (a)
It is determined whether the set dilution operation time (25 minutes) has elapsed. When 25 minutes have passed since the dilution operation started, a signal from the controller C) turns on the solution, refrigerant, chilled water, and cooling water pumps (8), (9), and C24.
1. (c) is stopped and the control operation is completed. Although not shown, if the temperature of the cooling water is lowered by a cooling tower equipped with an air blower, it goes without saying that the cooling water pump (c) and the air blower are stopped.

By controlling in this manner, even if the heating of the high temperature generator (1) is stopped by the 0N-OFF control at 4:40 p.m., for example, even if the heating of the high temperature generator (1) is stopped at 5:10 p.m. (the limit time at which comfortable cooling can be continued as described above). ), heating of the high-temperature generator (1) is started again by 0N-OFF control, and the absorption liquid in this generator is heated to a predetermined temperature, so comfortable cooling continues until 5:25 p.m. It becomes possible to do so. Furthermore, since the dilution operation is started when the temperature of the absorption liquid is raised to a predetermined temperature, heating energy from this start time to 5:25 p.m. can also be saved.

In addition, when using this machine as a heat pump, a hot water temperature detector (not shown) is installed instead of the cold water temperature detector (Sl).
should be placed in pipe d.

(f) Effects of the Invention As described above, the present invention provides an absorption refrigerator (absorption heat pump) of this type that performs ON-OFF control of the generator during partial load, by controlling the internal temperature of the generator. Since the system detects this and adjusts the start time of the dilution operation using a computer, it is possible to continue providing comfortable cooling (heating) until the end of the working day in a company or office, that is, until the time when cooling (heating) is stopped. Moreover, the thermal energy for driving the absorption refrigerator (absorption heat pump) can be saved during the time when the generator is OFF and the time from the start of dilution operation to the time when cooling (heating) is stopped.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration explanatory diagram showing one embodiment of the control device of the present invention, FIG. 2 is a block diagram explaining an example of the schematic configuration of a controller used in the control device of the present invention, and FIG. 3 is a diagram illustrating the control of the present invention. It is a flowchart which shows an example of control operation of a device. (1)...High temperature generator, (8), (9), (Foundation),
(c)...pump, (O...controller, (S,)...
...chilled water temperature detector, (S,)...occurrence temperature detector, leap...opening/closing valve, (a)...central processing unit,
(b)...External storage device, (1)...Clock. #i2Figure 3

Claims (1)

[Claims] (1) Absorption type cooling system that detects the load and controls the start and stop of heating of the generator, and also stops the heating of the generator and performs dilution operation of the absorption liquid for a certain period of time before stopping the operation. The media acquisition machine is equipped with a detector that detects the temperature inside the generator and a computer that receives the signal from this detector. The preliminary setting time to be set, the main setting time to stop the heating of the generator until the operation of the absorption type cold/hot medium acquisition machine is restarted, and the set value of the internal temperature of the generator, and the time between the preliminary setting time and the main setting time are selected. Equipped with a function to compare the temperature detected by the detector and the set value, and when the temperature detected by the detector is below the set value, the time to stop heating the generator to start dilution operation is set from the preset time. A control device for an absorption type refrigerant/hot medium acquisition machine, characterized in that the combiator is equipped with a function to change the dilution operation later, and the start time of dilution operation is adjusted between a preset time and a main set time.