JP2017207218A - Absorption type refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorption type refrigerating machine capable of properly determining operation performance by acquiring correct refrigerating machine data of the absorption type refrigerating machine.SOLUTION: In an absorption type refrigeration machine 100 which includes a high temperature regenerator 5, a low temperature regenerator 6, an evaporator 1, a condenser 7 and an absorber 2 and which comprises by forming circulation paths for an absorption solution and a refrigerant respectively by connecting these by piping, in the case where a control part 57 for adapter determines that a state in which a difference between a hot/cold water outlet temperature and a preset temperature of the hot/cold water of the evaporator 1 is within a predetermined temperature has continued for predetermined time, it determines that a safe operation is being performed, and refrigerating machine data is acquired.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an absorption refrigerator, and more particularly, to an absorption refrigerator capable of acquiring refrigerator data during stable operation.

In general, an absorption refrigerating machine that includes a high-temperature regenerator, a low-temperature regenerator, an evaporator, a condenser, and an absorber and that connects these pipes to form a circulation path for an absorbing liquid and a refrigerant is known. Absorption refrigerators are used for central air conditioning in office buildings, for example.
In such an absorption chiller, conventionally, for example, data such as cold / hot water outlet temperature is acquired and added to the increase / decrease value of the operation amount according to the number of operating cold / hot water main bodies. And the technique which reduced the behavior at the time of a sudden load change by controlling the number of operation | movement of the main body of a cold / hot water machine and was able to perform stable control is disclosed (for example, refer patent document 1). .

Japanese Patent No. 3030169

As shown in the prior art, in absorption refrigerators, data such as cold / hot water temperature, cooling water temperature, high-temperature regenerator temperature, low-temperature regenerator temperature are sequentially acquired, and various controls are performed based on these data. It is generally done.
However, for example, data may be acquired even when the operation state of the absorption chiller is unstable, such as during high-load operation. Using data acquired in such an unstable operation state, for example, COP or the like When determining the driving performance, there is a problem that an error may occur in the driving performance.
Therefore, the operation performance of the absorption refrigeration machine can be properly determined, and if there is a problem, early detection is possible, and appropriate maintenance is required.

  The present invention has been made in view of the circumstances described above, and an object of the present invention is to provide an absorption refrigerator that can appropriately determine the operation performance of the absorption refrigerator.

  In order to achieve the above object, the present invention comprises a high-temperature regenerator, a low-temperature regenerator, an evaporator, a condenser, and an absorber, and these are connected by piping to form absorption circuits and refrigerant circulation paths, respectively. The refrigerator includes a control unit, and the control unit determines that a state where a difference between a cold / hot water outlet temperature of the evaporator and a set temperature of the cold / hot water is within a predetermined temperature range continues for a predetermined time. In this case, it is determined that stable operation is being performed, and refrigerator data is acquired.

  According to this, when the control unit determines that the state where the difference between the cold / hot water outlet temperature of the evaporator and the set temperature of the cold / hot water is within the predetermined temperature range continues for a predetermined time, stable operation is performed. By acquiring the refrigerator data, it is possible to acquire the refrigerator data when it is determined that the stable operation is being performed.

  According to the present invention, by acquiring the refrigerator data that is determined to be stable operation by the control unit, the refrigerator data when it is determined that the stable operation is reliably performed is acquired. Can do. As a result, it is possible to appropriately determine the operation performance of the absorption chiller, and if there is a malfunction, early detection is possible, and appropriate maintenance can be performed.

Schematic configuration diagram of an absorption refrigerator according to the present embodiment The block diagram which shows the control structure of this embodiment Flow chart showing the operation of this embodiment

A first aspect of the present invention is an absorption refrigerator comprising a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser and an absorber, which are connected to each other to form a circulation path for an absorbing liquid and a refrigerant. A control unit, and when the control unit determines that the state where the difference between the cold / hot water outlet temperature of the evaporator and the set temperature of the cold / hot water is within a predetermined temperature range continues for a predetermined time, stable operation The absorption refrigerator is characterized in that it is determined that the operation is performed and the refrigerator data is acquired.
Thereby, the refrigerator data when it is judged that the stable operation is performed can be acquired.

According to a second aspect of the present invention, when the control unit determines that a state in which the difference in the cold water inlet / outlet temperature of the evaporator obtained every predetermined time is within a predetermined temperature range continues for a predetermined time, the stable operation The absorption refrigerator is characterized in that it is determined that the operation is performed and the refrigerator data is acquired.
Thereby, the refrigerator data when it is judged that the stable operation is performed can be acquired.

According to a third aspect of the present invention, the control unit calculates a refrigeration capacity ratio from the chilled / hot water temperature difference and the chilled / hot water flow rate value of the evaporator, and the refrigeration capacity ratio difference every predetermined time is within a predetermined range. When it is determined that the operation has continued for a predetermined time, it is determined that stable operation is being performed, and the refrigerator type refrigerator is characterized in that the refrigerator data is acquired.
Thereby, the refrigerator data when it is judged that the stable operation is performed can be acquired.

In a fourth aspect of the invention, the control unit calculates the heat balance, and when determining that the heat balance is within a predetermined range, employs the refrigerator data acquired as the refrigerator data during stable operation. This is an absorption refrigerator.
Thereby, the refrigerator data at the time of stable operation can be utilized reliably by adopting the refrigerator data when it is determined that the heat balance calculated by the control unit is within the predetermined range.

A fifth aspect of the invention is an absorption refrigeration machine comprising a remote monitoring adapter for communicating with a remote monitoring center, wherein the control unit is an adapter control unit provided in the remote monitoring adapter.
Thereby, it can be judged whether the stable operation is performed by the control part for adapters.

6th invention is an absorption refrigerator characterized by the said control part which calculates a heat balance being the control part for centers with which the said remote monitoring center is provided.
Thereby, the refrigerator data at the time of stable operation can be reliably utilized by the center control unit of the remote monitoring center.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an absorption refrigerator according to the present embodiment. The absorption chiller 100 is an absorption chiller / heater that can circulate and supply cold water or hot water to a load (not shown), and uses water as a refrigerant and an aqueous lithium bromide (LiBr) solution as an absorbent.

As shown in FIG. 1, the absorption refrigerator 100 includes an evaporator 1, an absorber 2 provided in parallel with the evaporator 1, and an evaporator absorber body 3 that houses the evaporator 1 and the absorber 2. And a high temperature regenerator 5 provided with a gas burner (heating means) 4, a low temperature regenerator 6, a condenser 7 arranged in parallel with the low temperature regenerator 6, and the low temperature regenerator 6 and the condenser 7 were accommodated. And a low-temperature regenerator condenser body 8.
The absorption refrigerator 100 includes a low-temperature heat exchanger 12, a high-temperature heat exchanger 13, a refrigerant drain heat recovery unit 17, a rare absorption liquid pump 45, a concentrated absorption liquid pump 47, and a refrigerant pump 48. These devices are connected to each other through absorption liquid pipes 21 to 25 and refrigerant pipes 31 to 35 to form a circulation path.

The evaporator 1 is provided with a cold / hot water pipe 14 for circulatingly supplying brine that has exchanged heat with the refrigerant in the evaporator 1 to a heat load (not shown) (for example, an air conditioner). A partially formed heat transfer tube 14 </ b> A is arranged in the evaporator 1.
The absorber 2 and the condenser 7 are provided with cooling water pipes 15 for sequentially passing cooling water through the absorber 2 and the condenser 7, and each heat transfer pipe 15 </ b> A formed in a part of the cooling water pipe 15. , 15B are arranged in the absorber 2 and the condenser 7, respectively.

The absorber 2 has a function of absorbing the refrigerant vapor evaporated in the evaporator 1 into the absorption liquid and maintaining the pressure in the evaporator absorber body 3 in a high vacuum state. In the lower part of the absorber 2, a rare absorption liquid reservoir 2A is formed, in which a rare absorption liquid diluted by absorbing refrigerant vapor is accumulated, and the rare absorption liquid reservoir 2A has a rare absorption liquid pump 45. One end of the liquid pipe 21 is connected. The rare absorbent liquid pipe 21 includes a branched rare absorbent liquid pipe 21A that branches on the downstream side of the rare absorbent liquid pump 45.
After passing through the refrigerant drain heat recovery unit 17, the branched diluted absorbent pipe 21 </ b> A joins the diluted absorbent pipe 21 again on the downstream side of the low-temperature heat exchanger 12 of the diluted absorbent pipe 21. The other end of the rare absorbent tube 21 passes through the high temperature heat exchanger 13 and then opens to the gas layer portion 5B located above the heat exchange portion 5A formed in the high temperature regenerator 5.
The rare absorption liquid pipe 21 is branched into the second branch pipe 21B on the downstream side of the low-temperature heat exchanger 12, and the second branch pipe 21B opens into the low-temperature regenerator 6.

  The high-temperature regenerator 5 is configured by housing the gas burner 4 in a shell 60, and a heat exchanging unit 5 </ b> A that heats and regenerates the absorbing liquid using the flame of the gas burner 4 as a heat source is formed above the gas burner 4. An exhaust path 40 through which the exhaust gas burned by the gas burner 4 flows is connected to the heat exchange section 5A, and an exhaust gas heat exchanger 41 is provided in the exhaust path 40. The gas burner 4 is connected to a gas pipe 61 to which fuel gas is supplied and an intake pipe 63 to which air from the blower 62 is supplied. The gas pipe 61 and the intake pipe 63 are connected to fuel gas and air. A control valve 64 is provided for controlling the amount. The gas pipe 61 is provided with a gas flow meter 65.

On the side of the heat exchanging unit 5A, an intermediate absorbing liquid reservoir 5C is formed in which the intermediate absorbing liquid that has been heated and regenerated by the heat exchanging unit 5A and then flows out of the heat exchanging unit 5A is accumulated. One end of a second intermediate absorption liquid pipe 23 is connected to the lower end of the intermediate absorption liquid reservoir 5C, and a high temperature heat exchanger 13 is provided in the second intermediate absorption liquid pipe 23. The high-temperature heat exchanger 13 heats the absorption liquid flowing through the first intermediate absorption liquid pipe 22 with the heat of the high-temperature intermediate absorption liquid flowing out from the intermediate absorption liquid reservoir 5C, and the gas burner 4 in the high-temperature regenerator 5 is heated. It aims to reduce fuel consumption.
The other end of the second intermediate absorption liquid pipe 23 is connected to a concentrated absorption liquid pipe 25 that connects the low temperature regenerator 6 and the absorber 2. Further, the upstream side of the second intermediate absorption liquid pipe 23 at the high temperature heat exchanger 13 and the absorber 2 are connected by an absorption liquid pipe 24 with an on-off valve V1 interposed therebetween.

The low temperature regenerator 6 uses the refrigerant vapor separated in the high temperature regenerator 5 as a heat source to heat and regenerate the absorption liquid stored in the absorption liquid reservoir 6A formed in the low temperature regenerator 6, and the absorption liquid reservoir 6A. The heat transfer tube 31 </ b> A formed in a part of the refrigerant tube 31 extending from the upper end of the high temperature regenerator 5 to the bottom of the low temperature regenerator 6 is disposed. By circulating the refrigerant vapor through the refrigerant pipe 31, the heat of the refrigerant vapor is transmitted to the absorption liquid stored in the absorption liquid reservoir 6A via the heat transfer pipe 31A, and the absorption liquid is further concentrated.
One end of a concentrated absorption liquid pipe 25 is connected to the absorption liquid reservoir 6A of the low temperature regenerator 6, and the other end of the concentrated absorption liquid pipe 25 is provided at the upper part of the gas layer portion 2B of the absorber 2. Connected to 2C. The concentrated absorbent pipe 25 is provided with a concentrated absorbent pump 47 and a low-temperature heat exchanger 12. The low-temperature heat exchanger 12 heats the rare absorbent flowing through the rare absorbent pipe 21 with the warm heat of the concentrated absorbent flowing out from the absorbent reservoir 6B of the low-temperature regenerator 6.

Further, the concentrated absorbent pipe 25 is provided with a bypass pipe 27 that bypasses the concentrated absorbent pump 47 and the low-temperature heat exchanger 12.
When the operation of the concentrated absorbent pump 47 is stopped, the absorbent stored in the absorbent reservoir 6A of the low temperature regenerator 6 is supplied into the absorber 2 through the concentrated absorbent pipe 25 and the bypass pipe 27.

As described above, the gas layer portion 5 </ b> B of the high-temperature regenerator 5 and the refrigerant liquid reservoir 7 </ b> A formed at the bottom of the condenser 7 are connected by the refrigerant pipe 31. The refrigerant pipe 31 includes a heat transfer pipe 31A and a refrigerant drain heat recovery unit 17 piped to the absorption liquid reservoir 6A of the low-temperature regenerator 6, and the upstream side of the heat transfer pipe 31A of the refrigerant pipe 31 and the gas layer of the absorber 2 The part 2B is connected by a refrigerant pipe 32 having an on-off valve V2.
In addition, one end of a refrigerant pipe 34 through which the refrigerant flowing out from the refrigerant liquid pool 7A flows is connected to the refrigerant liquid pool 7A of the condenser 7, and the other end of the refrigerant pipe 34 is a U-seal portion 34A that is curved downward. It is connected to the gas layer part 1A of the evaporator 1 via.
Below the evaporator 1 is formed a refrigerant liquid reservoir 1B in which the liquefied refrigerant is accumulated. The refrigerant liquid reservoir 1B and the spreader 1C disposed above the gas layer portion 1A of the evaporator 1 are provided by a refrigerant pump 48. It is connected by a refrigerant pipe 35 to intervene.

The cooling water pipe 15 is provided with a cooling water inlet temperature sensor 36 for detecting the temperature on the inlet side of the cooling water flowing through the cooling water pipe 15 and a cooling water outlet temperature sensor 37 for detecting the temperature on the outlet side of the cooling water. Yes.
The cold / hot water pipe 14 is provided with a cold / hot water inlet temperature sensor 38 for detecting the temperature on the inlet side of the cold / hot water flowing through the cold / hot water pipe 14 and a cold / hot water outlet temperature sensor 39 for detecting the temperature on the outlet side of the cold / hot water.
In addition, a pipe 14B that connects the inlet side and the outlet side of the cold / hot water pipe 14 is provided, and a cold / hot water differential pressure sensor 76 that detects a pressure difference between the inlet side and the outlet side of the cold / hot water pipe 14 is provided in the pipe 14B. Is provided.
Furthermore, a pipe 15B for connecting the inlet side and the outlet side of the absorber 2 of the cooling water pipe 15 is provided, and in this pipe 15B, a cooling water difference for detecting a pressure difference between the inlet side and the outlet side of the cooling water pipe 15 is provided. A pressure sensor 77 is provided.

Further, the absorption refrigerator 100 of the present embodiment includes an extraction device 70, and the extraction device 70 includes a tank 71. An extraction pipe 72 communicating with the gas layer 2 </ b> B of the absorber 2 is connected to the upper portion of the tank 71. A return pipe 73 communicating with the lower side of the absorber 2 is connected to the bottom of the tank 71. Further, an absorption liquid pipe 75 connected to the rare absorption liquid pipe 21 via an ejector pump 74 is connected to the upper portion of the tank 71.
Then, by driving the ejector pump 74, the rare absorbing liquid in the rare absorbing liquid pipe 21 is taken into the tank 71 through the absorbing liquid pipe 75. Due to the rare absorption liquid flowing in the absorption liquid pipe 75, the inside of the tank 71 becomes negative pressure, thereby extracting not only the non-condensable gas stored in the upper part of the absorber 2, but also the refrigerant vapor, the vaporized absorption liquid, and the like. It is guided to the upper side of the tank 71 through the trachea 72.

  Among the gases guided to the tank 71, the refrigerant vapor and the vaporized absorption liquid are absorbed and absorbed in the absorption liquid stored below the tank 71, but the non-condensable gas cannot be dissolved in the absorption liquid. It is stored above the tank 71. Then, the absorbing liquid accumulated below the tank 71 is returned to the absorber 3 through the return pipe 73.

Next, the control configuration of this embodiment will be described.
FIG. 2 is a block diagram showing a control configuration of the present embodiment.
As shown in FIG. 2, the absorption refrigerator 100 according to the present embodiment includes a controller 50, and the controller 50 includes a refrigerator controller 51. The refrigerator control unit 51 centrally controls each part of the absorption refrigerator 100, and stores a CPU as a calculation execution unit, a basic control program executable by the CPU, predetermined data, and the like in a nonvolatile manner. A memory 52 such as a ROM and a RAM for storing, and other peripheral circuits are provided.
The refrigerator control unit 51 includes a cooling water inlet temperature sensor 36, a cooling water outlet temperature sensor 37, a cold / hot water inlet temperature sensor 38, a cold / hot water outlet temperature sensor 39, a gas flow meter 65, and a cold / hot water differential pressure sensor 76. And the detection signal of the cooling water differential pressure sensor 77 is each input.
The controller 50 includes a timer 53, an operation unit 54, and a notification unit 55.

  The controller 50 for the refrigerator 50 of the controller 50 controls the fuel control valve 64 of the gas burner 4 of the absorption refrigerator 100 so as to perform combustion control by the gas burner 4, as well as the rare absorbent pump 45 and the concentrated absorbent pump 47. And it is comprised so that drive control of the refrigerant | coolant pump 48 may be performed. Furthermore, the refrigerator control unit 51 of the controller 50 performs inverter control of the rare absorption liquid pump 45, the concentrated absorption liquid pump 47, and the refrigerant pump 48, so that the rare absorption liquid pump 45, the intermediate absorption liquid pump 46, and the deep absorption liquid pump. The flow rate is controlled by the liquid pump 47 and the refrigerant pump 48. The refrigerator control unit 51 is configured to perform opening / closing control of the valves 28, V1, and V2.

Further, a remote monitoring adapter 56 is connected to the controller 50, and various types of refrigerator data acquired by the refrigerator control unit 51 of the controller 50 are sent to the remote monitoring adapter 56.
The remote monitoring adapter 56 includes an adapter control unit 57. The adapter control unit 57 stores a CPU as a calculation execution unit, a basic control program executable by the CPU, predetermined data, and the like in a nonvolatile manner. A memory such as a ROM and a RAM, and other peripheral circuits are provided.
Here, as the refrigerator data, for example, cold water inlet temperature, cold water outlet temperature, high temperature regenerator temperature, condensation temperature, cooling water inlet temperature, cooling water outlet temperature, absorption liquid temperature, absorption liquid concentration, refrigerant temperature, Various data such as control valve opening are included.

The remote monitoring adapter 56 is configured to be able to communicate with the remote monitoring center 58 by wire or wireless. The remote monitoring center 58 includes a center control unit 59. The center control unit 59 stores a CPU as a calculation execution unit, a basic control program executable by the CPU, predetermined data, and the like in a nonvolatile manner. A memory such as a ROM and a RAM, and other peripheral circuits are provided.
The center control unit 59 of the remote monitoring center 58 acquires the refrigerator data sent from the remote monitoring adapter 56, determines whether or not maintenance is necessary based on the refrigerator data, and obtains the aging refrigerator acquired in the past. It is configured to make a deterioration judgment by comparing data.

In the present embodiment, the refrigerator control unit 51 acquires the refrigerator data and sends it to the remote monitoring adapter 56. Refrigerating machine data is acquired every minute, for example. The timer 53 performs time measurement.
After acquiring the refrigerator data, the adapter controller 57 of the remote monitoring adapter 56, based on the cold / hot water outlet temperature T1 and the cold / hot water set temperature T0 detected by the cold / hot water outlet temperature sensor 39, The cold / hot water temperature difference T2 is calculated from the cold / hot water set temperature T0.
Then, the adapter controller 57 determines whether or not the cold / hot water temperature difference T2 is within a predetermined range. The predetermined range is set to an arbitrary temperature within a range of ± 0.1 ° C. to ± 0.5 ° C., for example. When the predetermined range is set from −0.1 ° C. to 0.1 ° C., it is determined by the following equation.
−0.1 ° C. ≧ T2 (Cold / hot water outlet temperature T1—Cold / hot water set temperature T0) ≧ 0.1 ° C.
The adapter controller 57 determines whether the state of the cold / hot water temperature difference T2 within this range continues for a predetermined time (for example, 10 minutes). It is determined that stable heating operation is being performed (first condition).
In this case, for example, whether or not the stable operation is performed when the predetermined range is set to a range of −0.1 to 0.1 and when the predetermined range is set to a range of −0.5 to 0.5. It is expected that the judgment will be different. That is, when the predetermined range is set in the range of -0.1 to 0.1, the possibility of being determined as stable operation is low, and when the predetermined range is set in the range of -0.5 to 0.5, stable operation is performed. Is likely to be determined. For this reason, it is necessary to appropriately set the predetermined range according to the season and the driving load.

Further, the adapter controller 57 calculates cold / hot water inlet / outlet temperature differences T3 and T4, which are the difference between the cold / hot water inlet temperature and the cold / hot water outlet temperature, based on the refrigerator data sent from the refrigerator controller 51. . Here, the cold / hot water inlet / outlet temperature difference T3 is the current cold / hot water inlet / outlet temperature difference, and the cold / hot water inlet / outlet temperature difference T4 is the cold / hot water inlet / outlet temperature difference acquired immediately before.
The adapter controller 57 determines whether or not the difference T5 between the cold / hot water inlet / outlet temperature difference T3 and the cold / hot water inlet / outlet temperature difference T4 is within a predetermined range. The predetermined range is set to an arbitrary temperature within a range of ± 0.1 ° C. to ± 0.5 ° C., for example. When the predetermined range is set from −0.1 ° C. to 0.1 ° C., it is determined by the following equation.
−0.1 ≧ T5 (Cold / hot water inlet / outlet temperature difference T3—Cold / hot water inlet / outlet temperature difference T4) ≧ 0.1 ° C.
The adapter controller 57 determines whether or not the temperature difference T5 is within this range for a predetermined time (for example, 10 minutes). It is determined that stable operation is being performed (second condition).
Also in this case, the predetermined range can be appropriately changed within the range of ± 0.1 ° C. to ± 0.5 ° C. according to the operating load.

Further, the adapter control unit 57 calculates the refrigeration capacity ratio Q from the cold / hot water temperature difference and the cold / hot water flow rate value based on the refrigerator data sent from the refrigerator control unit 51, and every predetermined time (for example, 1 Min) is determined whether the difference between the refrigeration capacity ratios Q1 and Q2 is within a predetermined range. Here, the refrigeration capacity ratio Q1 is the current refrigeration capacity ratio, and the refrigeration capacity ratio Q2 is the refrigeration capacity ratio acquired immediately before.
The refrigerating capacity ratio Q at the time of cooling is calculated by the following formula, for example.
Q = (Cold / hot water outlet temperature−Cool / hot water inlet temperature) ÷ Cold / hot water rated temperature difference ×
(Cold / hot water differential pressure sensor detection value / cold / hot water differential pressure rated value) ^0.5 x 100%

Further, the predetermined range is determined based on, for example, whether it is in a range of −3% to 3%. This predetermined range can also be set to an arbitrary value. When the predetermined range is set from -3% to 3%, it is determined by the following equation.
-3% ≧ (refrigeration capacity ratio Q1-refrigeration capacity ratio Q2) ≧ 3%
The adapter control unit 57 determines whether or not the state in which the refrigeration capacity ratio is within this range continues for a predetermined time (for example, 10 minutes). It is determined that the stable operation is being performed (third condition).

The adapter controller 57 is configured to send the refrigerator data acquired from the refrigerator controller 51 to the remote monitoring center 58 when it is determined that the third condition is satisfied from the first condition described above. Has been.
The center control unit 59 of the remote monitoring center 58 calculates the heat balance based on the acquired refrigerator data, and determines whether or not the calculated heat balance is in the range of 95% to 105%. When it is determined that the heat balance is in the range of 95% to 105%, the refrigerator data is adopted as the refrigerator data acquired during the stable operation. On the other hand, when it is determined that the heat balance is out of the above-mentioned range, the refrigerator data is acquired again without adopting the refrigerator data as not being the refrigerator data acquired during the stable operation.

In this embodiment, when it is determined that the third condition is satisfied from the first condition, it is determined that the operation is stable and the refrigerator data is sent to the remote monitoring center 58. However, the present invention is not limited to this. For example, you may make it judge that it is a stable driving | running state, when only the 1st condition is satisfy | filled. In addition, when the two conditions such as the first condition and the second condition, or the first condition and the third condition are satisfied, the stable operation state may be determined.
Further, in this embodiment, the adapter controller 57 determines whether or not stable operation is being performed, and the center controller 59 determines whether or not the heat balance is within a predetermined range. However, the present invention is not limited to this.
For example, when the control unit that has acquired the refrigerator data makes all determinations and determines that the data is the refrigerator data acquired during the stable operation, the refrigerator data is transmitted to the remote monitoring center 58 via the remote monitoring adapter 56. All the refrigerator data may be sent to the remote monitoring center 58 via the remote monitoring adapter 56, and the center control unit 59 determines whether stable operation is being performed and the heat balance is You may make it judge whether it is a predetermined range.

Next, the operation of this embodiment will be described.
During cooling operation such as cooling, brine (for example, cold water) is circulated and supplied to a heat load (not shown) via the cold / hot water pipe 14. The refrigerating machine control unit 51 controls the absorption refrigerating machine 100 so that the outlet side temperature of the brine evaporator 1 (temperature detected by the cold / hot water outlet temperature sensor 39) becomes a predetermined set temperature, for example, 7 ° C. The amount of heat input is controlled.
Specifically, the refrigerating machine control unit 51 starts all the pumps 45, 47, and 48 and controls the combustion of the gas in the gas burner 4, whereby the brine temperature measured by the cold / hot water outlet temperature sensor 39 is adjusted. The heating power of the gas burner 4 is controlled so that the temperature becomes a predetermined 7 ° C.

In this case, the rare absorbing liquid from the absorber 2 is heated via the rare absorbing liquid pipe 21 by the rare absorbing liquid pump 45 via the low temperature heat exchanger 12 and the high temperature heat exchanger 13 or the exhaust gas heat exchanger 41. It is sent to the high temperature regenerator 5.
The absorption liquid sent to the high temperature regenerator 5 is heated by the flame generated by the gas burner 4 and the high-temperature combustion gas in the high temperature regenerator 5, so that the refrigerant in the absorption liquid evaporates and separates. The intermediate absorption liquid whose concentration has been increased by evaporating and separating the refrigerant in the high temperature regenerator 5 is sent to the concentrated absorption liquid pipe 25 via the high temperature heat exchanger 13 and merged with the absorption liquid via the low temperature regenerator 6. .

  On the other hand, the absorption liquid sent to the low-temperature regenerator 6 is heated by the high-temperature refrigerant vapor supplied from the high-temperature regenerator 5 through the refrigerant pipe 31 and flowing into the heat transfer pipe 31A, and the refrigerant is further separated to have a concentration. The concentrated absorbent is combined with the absorbent through the high-temperature regenerator 5 and is sent to the absorber 2 through the low-temperature heat exchanger 12 by the concentrated absorbent pump 47. The concentrated sprayer 2C Scattered from.

The refrigerant separated and generated by the low-temperature regenerator 6 enters the condenser 7, condenses, and accumulates in the refrigerant liquid reservoir 7A. When a large amount of refrigerant liquid accumulates in the refrigerant liquid reservoir 7A, the refrigerant liquid flows out of the refrigerant liquid reservoir 7A, enters the evaporator 1 via the refrigerant pipe 34, and is pumped and dispersed by the operation of the refrigerant pump 48. It is sprayed on the heat transfer pipe 14A of the cold / hot water pipe 14 from the vessel 1C.
Since the refrigerant liquid sprayed on the heat transfer tube 14A evaporates by removing the heat of vaporization from the brine passing through the heat transfer tube 14A, the brine passing through the heat transfer tube 14A is cooled, and the brine thus lowered in temperature Cooling operation such as cooling is performed by being supplied to the heat load from the cold / hot water pipe 14.
Then, the refrigerant evaporated in the evaporator 1 enters the absorber 2, is absorbed by the concentrated absorbent supplied from the low temperature regenerator 6 and sprayed from above, and accumulates in the rare absorbent reservoir 2A of the absorber 2, and is rarely used. The circulation conveyed to the high temperature regenerator 5 by the absorption liquid pump 45 is repeated.

Next, control according to the present embodiment will be described with reference to a flowchart shown in FIG.
First, the operation of the absorption refrigerator 100 is started, and when the combustion by the gas burner 4 is started (step S1), the refrigerator controller 51 detects the cold water inlet temperature and the cold temperature detected by the cold water inlet temperature sensor 38. Cold / hot water outlet temperature detected by the water outlet temperature sensor 39, gas flow rate detected by the gas flow meter 65, cold / hot water differential pressure detected by the cold / hot water differential pressure detection sensor, and cooling water inlet temperature sensor 36. Various refrigerator data such as cooling water inlet temperature, cooling water outlet temperature detected by the cooling water outlet temperature sensor 37, and cooling water differential pressure detected by the cooling water differential pressure detection sensor are acquired and sent to the remote monitoring adapter 56. .

After acquiring the refrigerator data, the adapter controller 57 of the remote monitoring adapter 56 calculates the cold / hot water temperature difference T2 based on the cold / hot water outlet temperature T1−the cold / hot water set temperature T0, and the cold / hot water temperature difference T2 is, for example, − It is determined whether the temperature is in the range of 0.1 ° C. to 0.1 ° C. (step S2).
The adapter controller 57 determines whether the cold / hot water temperature difference T2 is in this range for a predetermined time. If the adapter controller 57 determines that the cold water temperature difference T2 is continued for a predetermined time, the adapter controller 57 Then, it is determined whether or not the difference T5 between the cold / hot water inlet / outlet temperature difference T3 and the cold / hot water inlet / outlet temperature difference T4 is in a range of −0.1 ° C. to 0.1 ° C., for example (step S3).

The adapter controller 57 determines whether or not the temperature difference T5 remains in this range for a predetermined time. If it is determined that the temperature difference T5 continues for a predetermined time, the adapter control unit 57 determines whether the temperature difference T5 and the hot / cold water flow rate value. The refrigeration capacity ratio Q is calculated, and it is determined whether or not the difference between the refrigeration capacity ratios Q1 and Q2 every predetermined time is within a range of, for example, −3% to 3% (step S4).
Then, the adapter control unit 57 determines whether or not the state where the refrigeration capacity ratio difference is within this range continues for a predetermined time, and if it is determined that the predetermined time continues, the cooling or heating stable operation is performed. Judge that it is done.

If the above-described conditions (first to third conditions) are satisfied, the adapter control unit 57 sends the refrigerator data to the remote monitoring center 58 (step S5).
The center control unit 59 of the remote monitoring center 58 calculates the heat balance based on the acquired refrigerator data, and determines whether the calculated heat balance is in the range of 95% to 105% (step) S6).
When it is determined that the heat balance is in the range of 95% to 105%, the refrigerator data is adopted as the refrigerator data acquired during the stable operation (step S7). On the other hand, when it is determined that the heat balance is out of the above-mentioned range, the refrigerator data is acquired again without adopting the refrigerator data as not being the refrigerator data acquired during the stable operation.

As described above, in the present embodiment, the adapter control unit 57 (control unit) is in a state where the difference between the cold / hot water outlet temperature of the evaporator 1 and the set temperature of the cold / hot water is within a predetermined temperature range. If it is determined that the operation has continued for a predetermined time, it is determined that stable operation is being performed, and refrigerator data is acquired.
According to this, the adapter control unit 57 determines that the state where the difference between the cold / hot water outlet temperature of the evaporator 1 and the set temperature of the cold / hot water is within the predetermined temperature range continues for a predetermined time. By acquiring data, it is possible to acquire refrigerator data when it is determined that stable operation is being performed reliably.

Further, in the present embodiment, the adapter controller 57 (control unit) continues the state in which the difference in the cold / hot water inlet / outlet temperature of the evaporator 1 acquired every predetermined time is within a predetermined temperature range for a predetermined time. If it is determined that the operation is stable, it is determined that the stable operation is being performed, and the refrigerator data is acquired.
According to this, the refrigerator control unit 57 determines that the state in which the difference in the cold / hot water inlet / outlet temperature of the evaporator 1 acquired every predetermined time is within the predetermined temperature range continues for the predetermined time. By acquiring this, it is possible to acquire refrigerator data when it is determined that stable operation is being performed reliably.

In the present embodiment, the adapter controller 57 (control unit) calculates the refrigeration capacity ratio from the chilled / hot water temperature difference and the chilled / hot water flow rate value of the evaporator 1, and the refrigeration capacity ratio difference for each predetermined time is When it is determined that the state within the predetermined range continues for a predetermined time, it is determined that the stable operation is performed, and the refrigerator data is acquired.
According to this, the state where the refrigerating capacity ratio difference for each predetermined time calculated from the cold / hot water temperature difference and the cold / hot water flow rate value of the evaporator 1 by the adapter control unit 57 is within the predetermined range continues for the predetermined time. By acquiring the refrigerator data determined to be, the refrigerator data when it is determined that the stable operation is performed can be acquired.

In the present embodiment, the center control unit 59 (control unit) calculates the heat balance, and if it is determined that the heat balance is within a predetermined range, the center control unit 59 is the refrigerator data during stable operation. Use the acquired refrigerator data.
According to this, by using the refrigerator data when it is determined that the heat balance calculated by the center control unit is within the predetermined range, the refrigerator data during stable operation can be used reliably. . As a result, it is possible to appropriately determine the operation performance of the absorption chiller, and if there is a malfunction, early detection is possible, and appropriate maintenance can be performed.

In this embodiment, the remote monitoring adapter 56 that communicates with the remote monitoring center 58 is provided, and it is determined whether or not the adapter controller 57 included in the remote monitoring adapter 56 is in stable operation.
According to this, it is possible to determine whether or not the stable operation is performed by the adapter control unit 57.

In the present embodiment, the center control unit 59 provided in the remote monitoring center 58 calculates the heat balance.
According to this, it is possible to reliably use the refrigerator data during stable operation by the center control unit 59 of the remote monitoring center 58.

In addition, this embodiment shows the one aspect | mode which applied this invention, Comprising: This invention is not limited to the said embodiment.
For example, in the present embodiment, the configuration including the gas burner 4 that performs heating by burning the fuel gas as a heating unit that heats the absorbing liquid in the high-temperature regenerator has been described. It is good also as a structure provided with the gas burner which burns kerosene or A heavy oil, or the structure heated using warm heat, such as a vapor | steam and exhaust gas.

DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 4 Gas burner 5 High temperature regenerator 6 Low temperature regenerator 7 Condenser 14 Cold / hot water pipe 15 Cooling water pipe 36 Cooling water inlet temperature sensor 37 Cooling water outlet temperature sensor 38 Cold / hot water inlet temperature sensor 39 Cold / hot water outlet temperature sensor 45 Rare absorbent pump 47 Concentrated absorbent pump 48 Refrigerant pump 50 Controller 51 Control unit for refrigerator 52 Memory 53 Timer 54 Operation unit 55 Notification unit 56 Remote monitoring adapter 57 Adapter control unit 58 Remote monitoring center 59 Center control unit 65 Gas Flow meter 70 Extraction device 76 Cold / hot water differential pressure sensor 77 Cooling water differential pressure sensor 100 Absorption type refrigerator

Claims (6)

In the absorption refrigerating machine comprising a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser and an absorber, and connecting these pipes to form a circulation path for the absorbing liquid and the refrigerant,
A control unit, and when the control unit determines that the state where the difference between the cold / hot water outlet temperature of the evaporator and the set temperature of the cold / hot water is within a predetermined temperature range continues for a predetermined time, stable operation The absorption refrigerator is characterized in that it is determined that the operation is performed and the refrigerator data is acquired.   When the controller determines that the state in which the difference between the cold water inlet / outlet temperature of the evaporator acquired at predetermined time is within a predetermined temperature range continues for a predetermined time, the stable operation is performed. 2. The absorption refrigerator according to claim 1, wherein the absorption refrigerator data is determined and the refrigerator data is acquired.   The control unit calculates a refrigeration capacity ratio from a chilled / hot water temperature difference and a chilled / hot water flow rate value of the evaporator, and a state in which the refrigeration capacity ratio difference per predetermined time is within a predetermined range continues for a predetermined time. The absorption chiller according to claim 1 or 2, wherein when it is determined, stable operation is determined and refrigeration data is acquired.   The control unit calculates a heat balance, and when determining that the heat balance is within a predetermined range, employs the refrigerator data acquired as the refrigerator data during stable operation. The absorption refrigerating machine according to any one of claims 1 to 3.   The remote monitoring adapter which communicates with a remote monitoring center is provided, The said control part is a control part for adapters with which the said remote monitoring adapter is provided, The control part for any one of Claims 1-3 characterized by the above-mentioned. Absorption refrigerator.   6. The absorption chiller according to claim 5, wherein the control unit for calculating the heat balance is a center control unit provided in the remote monitoring center.

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