JP2007187417A - Control device and control method for absorption refrigerating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for an absorption refrigerating device capable of attaining energy saving in addition to maintaining high temperature controllability. <P>SOLUTION: A control means 55 switchingly controls to carry out combustion and to stop combustion at a regenerator 5 based on an outlet temperature T<SB>CHOUT</SB>, a combustion start temperature T<SB>ON SP</SB>and a combustion stop temperature T<SB>OFF SP</SB>. Further in carrying out combustion, the control means 55 switchingly controls high combustion and low combustion to bring the outlet temperature T<SB>CHOUT</SB>close a target temperature TO. The control means 55 further acquires a load state from the time ratio of the combustion state and corrects the combustion start temperature T<SB>ON SP</SB>, the combustion stop temperature T<SB>OFF SP</SB>and the target temperature TO so that the time of the combustion stop state and low combustion state becomes long only in a medium and low load state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus and method for controlling an absorption refrigeration apparatus.

  The absorption refrigeration apparatus does not use a greenhouse gas such as chlorofluorocarbon, and can use natural gas and exhaust heat. Therefore, the absorption refrigeration apparatus has a small environmental load and is suitably used in the field of refrigeration and air conditioning. In this absorption refrigeration apparatus, energy saving is an important issue, and improvement in efficiency is desired.

  The absorption refrigeration apparatus includes an absorber, a regenerator, a condenser, and an evaporator, and is configured so that cold water can be sent from the evaporator by burning fuel in the regenerator and supplying heat. The cold water sent out is used for cooling and the like. The control device for controlling the absorption refrigeration apparatus controls the outlet temperature of the cold water by controlling the combustion state in the regenerator so as to be switched to three states of high combustion, low combustion execution, and combustion stop. The control device controls the combustion state so that the outlet temperature of the cold water falls within a predetermined specification temperature range based on the target temperature.

  In controlling the outlet temperature of the chilled water in this way, if the target temperature can be raised so that the outlet temperature of the chilled water falls within the specified temperature range, the fuel can be reduced. When the target temperature is raised in a high load state, if the load fluctuates and further increases, the cold water outlet temperature may not easily return within the specified temperature range even if the combustion is switched to high combustion. If the absorption refrigeration system is in a medium load state and a low load state, even if the load fluctuates, the outlet temperature of the chilled water can be relatively easily restored within the specified temperature range by switching to high combustion. Can be made. Therefore, if the target temperature can be raised only when the absorption refrigeration system is in a medium load state and a low load state, fuel can be reduced in the medium load state and the low load state, and energy saving can be achieved. And the temperature controllability of cold water can be maintained. However, it is difficult to directly measure the load in the absorption refrigeration apparatus, and there is no control apparatus for the absorption refrigeration apparatus that realizes such control.

  For example, Patent Document 1 discloses a control device that controls a refrigerator that is a compression refrigeration apparatus. The control device sets an operation start temperature for operating the compressor and an operation stop temperature for stopping the compressor within a predetermined temperature range, and performs the operation and operation stop of the compressor based on the detected internal temperature. In addition, the temperature range between the operation start temperature and the operation stop temperature is changed based on the outside air temperature. When the outside air temperature is low, the operation start temperature and the outside air temperature are high. The temperature range is changed so that the shutdown temperature becomes higher. As a result, the compressor stop time can be extended at a low outside air temperature, and power can be saved. In the control device disclosed in Patent Document 1, power can be saved at a low outside air temperature, but the load on the refrigerator is not determined only by the outside air temperature, but also by, for example, the amount of articles stored in the warehouse. Since it changes, the temperature range may be changed in a high load state, and the temperature controllability may be deteriorated.

  Patent Document 2 discloses a control device that controls a refrigerator that is a compression refrigeration apparatus. The control device sets an operation start temperature for operating the compressor and an operation stop temperature for stopping the compressor within a predetermined temperature range, and operates and stops the compressor based on the detected cold room temperature. When the operation rate is calculated, the operation rate is calculated from the operation time and the stop time of the compressor, and the temperature range between the operation start temperature and the operation stop temperature is changed based on the operation rate. The temperature range is changed so that the operation temperature range becomes higher when the operation temperature range becomes lower and the operation rate becomes higher. As a result, it is possible to prevent the compressor from being operated at a low outside temperature, the temperature of the freezer from rising, and the compressor from being operated without being operated when the refrigerator is installed. ing. In the control device disclosed in Patent Document 2, the operation rate of the compressor is prevented from becoming too low so that the operation rate of the compressor falls within a certain range. That is, when the compressor operating rate is low and the load is low, the operating temperature range is lowered so that the operating rate is increased, and energy saving cannot be achieved.

  Patent Document 3 discloses a control device that controls a temperature adjustment system including a heater and a cooler. This control device is a device that controls the room temperature so as to be held in the vicinity of a set value, and sets an upper control target value for controlling the cooler and a lower control target value for controlling the heater. By controlling the operation and shutdown of either one of the heaters, it is configured to control the room temperature so that it is kept near the set value. Furthermore, the deviation between the detected value of the room temperature and the target value is used. Thus, correction processing is performed so that the target value used when calculating the deviation approaches the set value. In this Patent Document 3, it is possible to improve the temperature controllability by correcting the target value to be close to the set value, but it is impossible to achieve a configuration that can achieve energy saving.

Japanese Patent Laid-Open No. 56-130573 JP 11-132619 A JP 2001-265445 A

  As described above, there is no control device for an absorption refrigeration apparatus that can achieve energy saving while maintaining high temperature controllability. Further, in the control devices for the compression refrigeration apparatus and other apparatuses, there is no control apparatus that can achieve energy saving while maintaining high temperature controllability.

  An object of the present invention is to provide a control device for an absorption refrigeration apparatus that can achieve energy saving while maintaining high temperature controllability.

The present invention is a control device for controlling an absorption refrigeration apparatus for adjusting the temperature of brine sent from an evaporator by supplying heat to a solution with a regenerator,
Temperature detecting means for detecting the temperature of the brine sent from the evaporator;
Setting means for initially setting the target temperature of the brine temperature sent from the evaporator;
A control means having a heat supply control unit and a correction unit,
The heat supply control unit controls the supply heat flow rate in the regenerator so that the brine temperature approaches the target temperature based on the brine temperature detected by the temperature detection means and the target temperature.
When the proportion of the state where the supply heat flow rate in the regenerator is large is small, the correction unit is in a state where the brine temperature is within the specified temperature range based on the target temperature initially set by the setting means and the supply heat flow rate is large It is a control device for an absorption refrigeration apparatus, wherein the target temperature is corrected so that the proportion occupied by is reduced.

  According to the present invention, the temperature of the brine sent from the evaporator is detected by the temperature detecting means. The control means has a heat supply control unit, and the heat supply control unit controls the supply heat flow rate in the regenerator so that the detected brine temperature approaches the target temperature. As a result, a brine having a temperature close to the target temperature is obtained, and the brine can be suitably used. Further, the control means has a correction unit, and when the ratio of the large supply heat flow rate in the regenerator is small, the correction unit sets the target temperature so that the ratio of the large supply heat flow rate is small. Is corrected. As a result, the supply heat flow rate in the regenerator can be reduced and energy saving can be realized. Moreover, the target temperature is corrected so that the brine temperature falls within the specification temperature range based on the target temperature initially set by the setting means, so the brine temperature does not deviate from the specification temperature range. High temperature controllability can be maintained. In addition, the state in which the ratio of the supply heat flow rate in the regenerator is small is small when the absorption refrigeration apparatus is in the medium load state and the low load state and the target temperature is corrected. Even if the load fluctuates, if the supply heat flow rate in the regenerator is increased, the brine temperature can be easily kept within the specified temperature range after the load fluctuates. Thus, since the target temperature is corrected only when the absorption refrigeration apparatus is in the medium load state and the low load state, high temperature controllability can be maintained. Therefore, energy conservation can be achieved while maintaining high temperature controllability.

Further, the present invention is an absorption refrigeration apparatus used for cooling and heating, an absorption chiller / heater,
In the cooling operation state, the correction unit increases the target temperature when the ratio of the large supply heat flow rate in the regenerator is small, and the ratio of the large supply heat flow rate in the regenerator is small in the heating operation state. The target temperature is corrected so as to lower the target temperature.

  According to the present invention, in the cooling operation state, when the proportion of the state where the supply heat flow rate in the regenerator is large is small, the correction unit corrects the target temperature to be high. In the heating operation state, when the proportion of the state where the supply heat flow rate in the regenerator is large is small, the correction unit corrects the target temperature to be low. Thus, energy saving can be achieved in both the cooling operation state and the heating operation state.

Further, the present invention is a control device for controlling an absorption refrigeration apparatus that adjusts the temperature of brine from an evaporator and supplies it by supplying heat to the solution with a regenerator,
Temperature detecting means for detecting the temperature of the brine sent from the evaporator;
Setting means for initially setting the target temperature of the brine temperature sent from the evaporator;
Control means having a heat supply control and correction unit,
The heat supply control unit is configured so that the brine temperature approaches the target temperature based on the brine temperature detected by the temperature detection unit and the heat supply start temperature and the heat supply stop temperature set based on the target temperature. , Control heat supply execution and heat supply stop in the regenerator,
When the proportion of the heat supply execution state in the regenerator is small, the correction unit has a brine temperature that falls within the specification temperature range based on the target temperature initially set by the setting means, and the ratio of the heat supply execution state is A control device for an absorption refrigeration apparatus, wherein the heat supply start temperature and the heat supply stop temperature are corrected so as to be small.

  According to the present invention, the temperature of the brine sent from the evaporator is detected by the temperature detecting means. The control means has a heat supply control unit, and is regenerated by the heat supply control unit based on the detected brine temperature and the heat supply start temperature and heat supply stop temperature set based on the target temperature. The heat supply execution and the heat supply stop in the container are controlled. As a result, a brine having a temperature close to the target temperature is obtained, and the brine can be suitably used. Further, the control means has a correction unit, and when the ratio of the heat supply execution state in the regenerator is small, the correction unit causes the heat supply start temperature and the heat to be reduced so that the ratio of the heat supply execution state is small. Supply stop temperature is corrected. This shortens the heat supply execution state time in the regenerator, thereby realizing energy saving. Moreover, the heat supply start temperature and the heat supply stop temperature are corrected so that the brine temperature falls within the specified temperature range based on the target temperature initially set by the setting means. It will not come off and high temperature controllability can be maintained. In addition, the state where the proportion of the heat supply execution state in the regenerator is small is a state where the absorption refrigeration apparatus is in the medium load state and the low load state, and the heat supply start temperature and the heat supply stop temperature are corrected. Even if the load of the absorption refrigeration system changes so as to increase, if the proportion of the heat supply execution state in the regenerator is increased, the temperature of the brine can be easily kept within the specified temperature range after the load changes. . Thus, since the heat supply start temperature and the heat supply stop temperature are corrected only when the absorption refrigeration apparatus is in the medium load state and the low load state, high temperature controllability can be maintained. Therefore, energy conservation can be achieved while maintaining high temperature controllability.

Further, the present invention is an absorption refrigeration apparatus used for cooling and heating, an absorption chiller / heater,
The correction unit increases the heat supply start temperature and the heat supply stop temperature when the ratio of the heat supply execution state in the regenerator is small in the cooling operation state, and occupies the heat supply execution state in the regenerator in the heating operation state. When the ratio is small, the heat supply start temperature and the heat supply stop temperature are corrected so as to lower the heat supply start temperature and the heat supply stop temperature.

  According to the present invention, in the cooling operation state, when the proportion of the heat supply execution state in the regenerator is small, the correction unit corrects the heat supply start temperature and the heat supply stop temperature to be high. In the heating operation state, when the proportion of the heat supply execution state in the regenerator is small, the correction unit corrects the heat supply start temperature and the heat supply stop temperature to be low. Thus, energy saving can be achieved in both the cooling operation state and the heating operation state.

Further, the present invention is a control method for controlling an absorption refrigeration apparatus for adjusting the temperature of brine from an evaporator and feeding it by supplying heat to the solution with a regenerator,
A temperature detection step of detecting the temperature of the brine sent from the evaporator;
When the proportion of the state where the supply heat flow rate in the regenerator is large is small, the temperature of the brine sent from the evaporator is within the specified temperature range based on the target temperature that is initially set, and the supply heat flow rate is large. An absorption refrigeration characterized by comprising a control step of correcting the target temperature so that the proportion occupied is small and controlling the flow rate of heat supplied to the regenerator so that the detected brine temperature approaches the target temperature This is a method for controlling the apparatus.

  According to the present invention, the temperature of the brine sent from the evaporator is detected, and the supply heat flow rate in the regenerator is controlled so that the temperature of the brine approaches the target temperature. As a result, a brine having a temperature close to the target temperature can be obtained, and the brine can be suitably used. Furthermore, when the proportion of the state where the supply heat flow rate is large in the regenerator is small, the target temperature is corrected so that the proportion of the state where the supply heat flow rate is large is small. As a result, the supply heat flow rate in the regenerator can be reduced and energy saving can be realized. In addition, since the target temperature is corrected so that the brine temperature falls within the specified temperature range based on the initially set target temperature, the brine temperature does not deviate from the specified temperature range, and high temperature controllability is achieved. Can be maintained. In addition, the state in which the ratio of the supply heat flow rate in the regenerator is small is small when the absorption refrigeration apparatus is in the medium load state and the low load state and the target temperature is corrected. Even if the load fluctuates, if the supply heat flow rate in the regenerator is increased, the brine temperature can be easily kept within the specified temperature range after the load fluctuates. Thus, since the target temperature is corrected only when the absorption refrigeration apparatus is in the medium load state and the low load state, high temperature controllability can be maintained. Therefore, energy conservation can be achieved while maintaining high temperature controllability.

Further, the present invention is an absorption refrigeration apparatus used for cooling and heating, an absorption chiller / heater,
In the control process, in the cooling operation state, when the proportion of the state where the supply heat flow rate in the regenerator is large is small, the target temperature is increased, and in the heating operation state, the proportion of the state where the supply heat flow rate in the regenerator is large is small. The target temperature is corrected so as to lower the target temperature.

  According to the present invention, in the cooling operation state, when the proportion of the state where the supply heat flow rate in the regenerator is large is small, the target temperature is corrected to be high. Further, in the heating operation state, when the proportion of the state in which the supply heat flow rate in the regenerator is large is small, the target temperature is corrected to be low. Thus, energy saving can be achieved in both the cooling operation state and the heating operation state.

Further, the present invention is a control method for controlling an absorption refrigeration apparatus for adjusting the temperature of brine from an evaporator and feeding it by supplying heat to the solution with a regenerator,
A temperature detection step of detecting the temperature of the brine sent from the evaporator;
When the proportion of the heat supply execution state in the regenerator is small, the proportion of the brine supplied from the absorption refrigeration apparatus falls within the specified temperature range based on the initial target temperature and the heat supply execution state The heat supply start temperature and the heat supply stop temperature are corrected so as to decrease, and the brine temperature is determined based on the detected brine temperature and the heat supply start temperature and the heat supply stop temperature set based on the target temperature. And a control step for controlling heat supply execution and heat supply stop in the regenerator so that the temperature of the regenerator approaches the target temperature.

  According to the present invention, the temperature of the brine sent from the evaporator is detected, and the heat supply execution and the heat supply stop in the regenerator are performed based on the temperature of the brine, the heat supply start temperature, and the heat supply stop temperature. Control. As a result, a brine having a temperature close to the target temperature can be obtained, and the brine can be suitably used. Further, when the proportion of the heat supply execution state in the regenerator is small, the heat supply start temperature and the heat supply stop temperature are corrected so that the ratio of the heat supply execution state is small. This shortens the heat supply execution state time in the regenerator, thereby realizing energy saving. In addition, since the heat supply start temperature and the heat supply stop temperature are corrected so that the brine temperature falls within the specification temperature range based on the initially set target temperature, the brine temperature may be out of the specification temperature range. And high temperature controllability can be maintained. In addition, the state where the proportion of the heat supply execution state in the regenerator is small is a state where the absorption refrigeration apparatus is in the medium load state and the low load state, and the heat supply start temperature and the heat supply stop temperature are corrected. Even if the load of the absorption refrigeration system changes so as to increase, if the proportion of the heat supply execution state in the regenerator is increased, the temperature of the brine can be easily kept within the specified temperature range after the load changes. . Thus, since the heat supply start temperature and the heat supply stop temperature are corrected only when the absorption refrigeration apparatus is in the medium load state and the low load state, high temperature controllability can be maintained. Therefore, energy conservation can be achieved while maintaining high temperature controllability.

Further, the present invention is an absorption refrigeration apparatus used for cooling and heating, an absorption chiller / heater,
In the control process, in the cooling operation state, when the ratio of the heat supply execution state in the regenerator is small, the heat supply start temperature and the heat supply stop temperature are increased, and in the heating operation state, the heat supply execution state in the regenerator occupies When the ratio is small, the heat supply start temperature and the heat supply stop temperature are corrected so as to lower the heat supply start temperature and the heat supply stop temperature.

  According to the present invention, in the cooling operation state, when the proportion of the heat supply execution state in the regenerator is small, the heat supply start temperature and the heat supply stop temperature are corrected to be increased. In the heating operation state, when the proportion of the heat supply execution state in the regenerator is small, the heat supply start temperature and the heat supply stop temperature are corrected to be low. Thus, energy saving can be achieved in both the cooling operation state and the heating operation state.

  According to the present invention, when the proportion of the state where the supply heat flow rate is large in the regenerator is small, the target temperature is corrected by the correction unit so that the proportion of the state where the supply heat flow rate is large is small. In addition, the target temperature is corrected so that the brine temperature falls within a specification temperature range based on the target temperature initially set by the setting means. Therefore, energy conservation can be achieved while maintaining high temperature controllability. Moreover, it can suppress that the supply heat flow rate in a regenerator becomes a large state, can suppress the fluctuation | variation of supply heat flow rate, and can extend the lifetime of an absorption refrigeration apparatus.

  Further, according to the present invention, energy saving can be achieved in both the cooling operation state and the heating operation state.

  According to the invention, when the proportion of the heat supply execution state in the regenerator is small, the heat supply start temperature and the heat supply stop temperature are corrected by the correction unit so that the ratio of the heat supply execution state is small. The Moreover, the heat supply start temperature and the heat supply stop temperature are corrected so that the brine temperature falls within the specification temperature range based on the target temperature initially set by the setting means. Therefore, energy conservation can be achieved while maintaining high temperature controllability. In addition, it is possible to suppress the heat supply execution state in the regenerator, and to suppress fluctuations in the heat supply execution state and the heat supply stop state, thereby extending the life of the absorption refrigeration apparatus.

  Further, according to the present invention, energy saving can be achieved in both the cooling operation state and the heating operation state.

  Further, according to the present invention, when the proportion of the state where the supply heat flow rate in the regenerator is large is small, the target temperature is corrected so that the proportion of the state where the supply heat flow rate is large is small. In addition, the target temperature is corrected so that the brine temperature falls within the specification temperature range based on the target temperature initially set by the setting means. Therefore, energy conservation can be achieved while maintaining high temperature controllability.

  Further, according to the present invention, energy saving can be achieved in both the cooling operation state and the heating operation state.

  According to the present invention, when the proportion of the heat supply execution state in the regenerator is small, the heat supply start temperature and the heat supply stop temperature are corrected so that the ratio of the heat supply execution state is small. In addition, the heat supply start temperature and the heat supply stop temperature are corrected so that the brine temperature falls within the specification temperature range based on the target temperature initially set by the setting means. Therefore, energy conservation can be achieved while maintaining high temperature controllability.

  Further, according to the present invention, energy saving can be achieved in both the cooling operation state and the heating operation state.

  FIG. 1 is a block diagram showing a control device 1 according to an embodiment of the present invention together with an absorption chiller / heater 2. The control device 1 is a control device for an absorption refrigeration apparatus, and is used to control an absorption refrigeration apparatus to which an absorption refrigeration cycle is applied. In the present embodiment, the absorption refrigeration apparatus is the absorption chiller / heater 2. The absorption chiller / heater 2 includes a regenerator 5, also called a generator, a condenser 6, an evaporator 7, and an absorber 8. In the present embodiment, the absorption chiller / heater 2 is a double-effect refrigeration apparatus to which a double-effect absorption refrigeration cycle is applied, and the regenerator 5 includes a high-temperature regenerator 10 and a low-temperature regenerator 11. Have.

  Between the regenerator 5 and the absorber 8, there is provided a dilute solution pipe 20 for sending a dilute solution from the absorber 8 to the high temperature regenerator 10 and the low temperature regenerator 11, and the high temperature regenerator 10 and the low temperature regenerator. A concentrated solution line 21 is provided for sending the concentrated solution from the vessel 11 to the absorber 8. The dilute solution line 20 and the concentrated solution line 21 are interposed between a dilute solution sent by the dilute solution line 20 and a concentrated solution sent by the concentrated solution line 21 with a heat exchanger 22 interposed in the middle. The heat exchange is configured. The dilute solution is a solution in which the concentration of the absorbing solution is relatively low among the solutions in which the refrigerant is absorbed in the absorbing solution, and the concentrated solution is the solution in which the concentration of the absorbing solution is compared among the solutions in which the refrigerant is absorbed in the absorbing solution. High solution.

  The dilute solution pipe 20 includes a dilute solution common pipe section 20a between the absorber 8 and the heat exchanger 22, and a dilute solution high temperature regenerator pipe section 20b between the heat exchanger 22 and the high temperature generator 10. And a dilute solution low-temperature regenerator pipe section 20 c between the heat exchanger 22 and the low-temperature generator 11. The dilute solution common pipe section 20 a is provided with a dilute solution pump 23 for sending the dilute solution from the absorber 8 to the high temperature regenerator 10 and the low temperature regenerator 11 through the heat exchanger 22. The concentrated solution pipe 21 includes a concentrated solution common pipe section 21 a between the absorber 8 and the heat exchanger 22, and a concentrated solution high temperature regenerator pipe section 21 b between the heat exchanger 22 and the high temperature generator 10. And a concentrated solution low-temperature regenerator pipe section 21 c between the heat exchanger 22 and the low-temperature generator 11. The concentrated solution low-temperature regenerator pipe line section 21 c is provided with a concentrated solution pump 24 for sending the concentrated solution from the low-temperature regenerator 11 through the heat exchanger 22 to the absorber 8.

  The high-temperature regenerator 10 is provided with a combustion furnace 14 in which fuel supplied from a fuel supply source via a fuel supply line 13 is burned. In the high temperature regenerator 10, the heat generated by the combustion in the combustion furnace 14 is sent from the absorber 8 via the heat exchanger 22 via the dilute solution common pipe part 20a and the dilute solution high temperature regenerator pipe part 20b. The diluted solution is supplied and the diluted solution is heated. When the diluted solution is heated in this way, the refrigerant becomes vapor and is expelled from the diluted solution. The refrigerant expelled as vapor in the high temperature regenerator 10 is sent to the low temperature regenerator 11 through the gas-liquid separator 15 and the high temperature regenerative refrigerant pipe 16. The solution from which the refrigerant has been expelled in the high temperature regenerator 10 becomes a concentrated solution, and is sent to the absorber 8 via the heat exchanger 22 via the concentrated solution high temperature regenerator pipe part 21b and the concentrated solution common pipe part 21a. . Exhaust gas generated in the combustion furnace 14 is discharged through an exhaust gas duct 18.

  The low-temperature regenerator 11 is provided with a low-temperature regenerator coil 6a through which the refrigerant sent from the high-temperature regenerator 10 flows, and the low-temperature regenerator coil 6a is connected to a dilute solution common pipe portion 20a and a dilute solution low-temperature regenerator line. The dilute solution sent from the absorber 8 via the heat exchanger 22 is sprayed through the part 20c. With this configuration, the heat of the refrigerant sent from the high-temperature regenerator 10 is supplied to the diluted solution sent from the absorber 8, and the diluted solution is heated. When the diluted solution is heated in this way, the refrigerant becomes vapor and is expelled from the diluted solution. The refrigerant expelled as vapor in the low temperature regenerator 11 is sent to the condenser 6 through the low temperature regenerative refrigerant passage 25. Also, the refrigerant sent from the high temperature regenerator 10 to the low temperature regenerator 11 and flowing down the low temperature regenerator coil and used for heating the dilute solution in the low temperature regenerator 11 is a high temperature refrigerant pipe different from the low temperature regenerative refrigerant passage 25. 26 to the condenser 6. The solution from which the refrigerant has been expelled by the low temperature regenerator 11 becomes a concentrated solution, and is sent to the absorber 8 via the heat exchanger 22 via the concentrated solution low temperature regenerator pipe part 21c and the concentrated solution common pipe part 21a. .

  The condenser 6 is provided with a condenser coil 6a through which cooling water flows down. The condenser coil 6a is supplied with cooling water supplied from a cooling water source via a cooling water supply pipe 28 through the absorber 8. Guided through. In the condenser 6, the refrigerant is guided around the condenser coil 6a. With this configuration, the coolant is cooled by the cooling water, and if the coolant is in a vapor state, the coolant is condensed. The refrigerant thus cooled and liquefied by the condenser 6 is sent to the evaporator 7 through the low-temperature refrigerant pipe 27. The cooling water that flows down the condenser coil 6 a and is used for cooling the refrigerant in the condenser 6 is discharged from the cooling water discharge pipe 29.

  The evaporator 7 is provided with an evaporator coil through which the brine flows down, and the brine supplied through the brine supply line 30 flows down the evaporator coil and is sent out through the brine delivery line 31. Further, the evaporator 7 is provided with a refrigerant circulation line 33, and the refrigerant is circulated by the refrigerant circulation pump 34 interposed in the refrigerant circulation circuit 33, and is distributed to the evaporator coil 7a. With such a configuration, the refrigerant takes the heat of vaporization from the brine flowing down the evaporator coil 7a and evaporates, and the brine flowing down the evaporator coil 7a can be cooled. The evaporator 7 and the absorber 8 are in communication with each other, and the refrigerant evaporated in the evaporator 7 is guided to the absorber 8.

  The absorber 8 is provided with an absorber coil 8a through which cooling water flows down. The absorber coil 8a is supplied from a cooling water source via a cooling water supply line 28. The concentrated solution sent from the high temperature regenerator 10 and the low temperature regenerator 11 via the concentrated solution pipe 21 is dispersed from the concentrated solution common pipe section 21 to the absorber coil 8a. With this configuration, the concentrated solution sent from the high temperature regenerator 10 and the low temperature regenerator 11 is cooled by cooling water. In the absorber 8, the refrigerant that evaporates in the evaporator 7 and is guided from the evaporator 7 is absorbed by the absorbing liquid. The cooling water flowing down the absorber coil 8a and used for cooling the solution by the absorber 8 is sent to the condenser coil 6a.

  Further, the absorption chiller / heater 2 is provided with a bypass pipe 37 that branches from the high-temperature refrigerant pipe 26 and is connected to the evaporator 7, and a cooling / heating switching valve 38 is interposed in the bypass pipe 37. . The cooling / heating switching valve 38 is an on-off valve that opens and closes the bypass pipe line 37.

  The operation in the state where the cooling / heating switching valve 38 is closed is a cold operation. In the cold operation, the refrigerant sent from the high temperature regenerator 10 to the low temperature regenerator 11 is supplied from the low temperature regenerator coil 11a as described above. After being sent to the condenser 6 via the high-temperature refrigerant line 26, it is sent from the condenser 6 to the evaporator 7 via the low-temperature refrigerant line 27. By evaporating the refrigerant with the evaporator 7, the brine can be cooled. Therefore, the absorption chiller / heater 2 can cool and send out the brine from the evaporator 7 by supplying heat from the regenerator 5 in the cooling operation in which the cooling / heating switching valve 38 is closed.

In the cold operation, the temperature of the brine sent from the evaporator 7 (hereinafter also referred to as “outlet temperature”) T _CHOUT decreases as the refrigerant evaporation amount per unit time in the evaporator 7 increases. The refrigerant evaporation amount per unit time in the evaporator 7 increases as the refrigerant absorption amount per unit time in the absorber 8 increases. The absorption amount of the refrigerant per unit time in the absorber 8 increases as the temperature of the solution in the absorber 8 decreases, and increases as the concentration of the solution absorption liquid in the absorber 8 increases. The concentration of the absorption liquid of the solution in the absorber 8 increases as the supply heat flow rate in the regenerator 5 increases. Therefore, in the cold operation, the outlet temperature T _CHOUT decreases as the supply heat flow rate in the regenerator 5 increases. The outlet temperature T _CHOUT is the temperature of the brine in the vicinity of the evaporator 7 in the brine delivery line 31.

  The operation in the state where the cooling / heating switching valve 38 is opened is a warm operation. In the warm operation, the refrigerant sent from the high temperature regenerator 10 to the low temperature regenerator 11 passes through the bypass line 37 from the high temperature refrigerant line 26. Then, it is sent to the evaporator 7 at a high temperature. As described above, in the configuration other than the portion where the refrigerant of the high-temperature refrigerant pipe 26 bypasses, the solution, the refrigerant, the brine, and the cooling water move in the same manner as in the above-described cold operation. In this warm operation, in the evaporator 7, the refrigerant does not take heat of vaporization from the brine, but heat is supplied from the high-temperature refrigerant to the brine, so that the brine can be heated. Therefore, the absorption chiller / heater 2 can heat and send the brine from the evaporator 7 by supplying heat from the regenerator 5 in the warm operation with the cooling / heating switching valve 38 opened.

In the warm operation, the outlet temperature T _CHOUT increases as the heating flow rate to the brine in the evaporator 7 increases. The heating flow rate is a heating amount per unit time. The heating flow rate to the brine in the evaporator 7 increases as the temperature of the refrigerant sent from the high-temperature refrigerant pipe 26 to the evaporator 7 via the bypass pipe 37 increases, and as the refrigerant flow rate increases. The temperature of the refrigerant sent from the high-temperature refrigerant pipe 26 to the evaporator 7 via the bypass pipe 37 increases as the supply heat flow rate in the regenerator 5 increases. The flow rate of the refrigerant sent from the high-temperature refrigerant pipe 26 to the evaporator 7 via the bypass pipe 37 increases as the supply heat flow in the regenerator 5 increases. Therefore, in the warm operation, the outlet temperature T _CHOUT increases as the supply heat flow rate in the regenerator 5 increases.

  A fuel supply flow rate control valve 40 is interposed in the fuel supply line 13 for supplying fuel to the combustion furnace 14. By changing the opening degree of the fuel supply flow rate control valve 40, the flow rate of the fuel supplied to the combustion furnace 14 is changed, the combustion state in the regenerator 5 is changed, and the supply heat flow rate in the regenerator 5 is changed. can do. As the opening of the fuel supply flow rate control valve 40 increases, the fuel flow rate increases, the combustion state becomes a state where the amount of heat generated per unit time is large, and the supply heat flow rate in the regenerator increases. In this way, the absorption chiller / heater 2 is configured to be able to change the supply heat flow rate in the regenerator 5.

  The opening degree of the fuel supply flow rate control valve 40 is configured to be changeable in a stepless manner, and thereby the fuel flow rate, the combustion state, and the supply heat flow rate may be changed in a stepless manner. In the present embodiment, the opening degree of the fuel supply flow rate control valve 40 can be changed in multiple steps, and the fuel flow rate, combustion state, and supply heat flow rate can be changed in multiple steps. . The fuel supply flow rate control valve 40 is configured to be switchable between three states: a fully open state, an intermediate open state where the opening degree is 50% of the opening degree in the overall state, and a fully closed state.

  When the fuel supply flow rate control valve 40 is in the fully closed state, the fuel supply is stopped and the fuel flow rate becomes 0, the amount of heat generated per unit time is in the combustion stopped state, and the heat supply in the regenerator 5 is not supplied. Stopped. On the other hand, when the fuel supply flow rate control valve 40 is in the open state, the fuel is supplied and in the combustion execution state, and the regenerator 5 supplies heat to the solution. The open state includes a fully open state and an intermediate open state, and the combustion execution state includes a high combustion state and a low combustion state. When the fuel supply flow rate control valve 40 is in the fully open state, the fuel flow rate is large and the amount of generated heat per unit time is large compared to the intermediate open state, and the fuel supply flow rate control valve 40 is in a high combustion state. When the fuel supply flow rate control valve 40 is in the intermediate open state, the fuel flow rate is small and the amount of heat generated per unit time is low compared to the fully open state, and the fuel supply flow rate control valve 40 is in a low combustion state. The supply heat flow rate in the regenerator 5 increases in the order of the combustion stop state, the low combustion state, and the high combustion state.

  Brine, also called a secondary refrigerant, is supplied to the customer and used for temperature control. The absorption chiller / heater 2 is a device for supplying the brine by heating or cooling in this way, and its use is not limited, but in this embodiment, it is used for cooling and heating. In the present embodiment, the brine is water. The absorbing liquid and the refrigerant may be water and ammonia, but in the present embodiment, are lithium bromide (LiBr) and water. In the present embodiment, the fuel is natural gas also called city gas. As described above, the absorption chiller / heater 2 is an apparatus in which lithium bromide is used as an absorbing liquid, water is used as a refrigerant, and natural gas is used as a fuel.

In order to control this absorption-type cold / hot water machine 2, the control apparatus 1 according to this invention is used. The control device 1 controls the combustion state in the combustion furnace 14 by controlling the opening degree of the fuel supply flow rate control valve 40 to switch, controls the amount of heat supplied to the solution in the regenerator 5, and controls the brine delivery pipe. The temperature of the brine sent out from line 31 and hence the outlet temperature T _{CHOUT of the} brine is controlled. The combustion state is also referred to as a combustion position, and thus the high combustion state, the low combustion state, and the combustion stop state are also referred to as a high combustion position, a low combustion position, and a combustion stop position. The control device 1 is configured to control so as to switch the three combustion positions, and such control is also called three-position control.

The control device 1 includes a temperature detecting means 50 for detecting the outlet temperature T _CHOUT , a setting means 51 for setting control condition information, a control valve drive command means 52 for opening and closing the fuel supply flow rate control valve 40, and a cooling / heating switching valve. Switching valve drive command means 53 for opening and closing 38, storage means 54 for storing information used for control, and control means 55 for controlling the control valve drive command means 52 and the switch valve drive command means 53. Based on the outlet temperature T _CHOUT detected by the detection means 50 and the information stored in the storage means 54, the control means 55 satisfies the control condition determined by the control condition information set by the setting means 51. Then, the control valve drive command means 52 and the switching valve drive command means 53 are controlled to cause the fuel supply flow control valve 40 and the cooling / heating switching valve 38 to open and close.

The temperature detection means 50 detects the temperature of the brine in the brine delivery line 31 near the evaporator 7 in the brine delivery line 31. The detected temperature is the outlet temperature T _CHOUT , and the temperature detecting means 50 gives a signal representing the outlet temperature T _CHOUT to the control means 55. The temperature detection means 50 is a temperature sensor, and temperature sensors based on various principles can be used.

  The setting means 51 includes an operation unit operated by an operator, and is configured to be able to input information by operating the operation unit. When information for determining a control condition is input, the setting means 51 sets the information as control condition information and gives a signal representing the control condition information to the control means 55. The setting means 51 can be operated by an operator to input information for instructing operation start and operation stop, and gives a signal representing the information to the control means 55.

  The control condition includes an operation condition and a temperature condition. Therefore, the control condition information includes operation condition information and temperature condition information. The operation condition is a condition that a selected operation is executed among a cold operation in which the brine is cooled and sent out and a warm operation in which the brine is heated and sent out. The setting means 51 sets the selection information of the cold operation and the warm operation input by the operator's operation as the operation condition information. When brine is used for air conditioning, the cold operation is a cooling operation, and the warm operation is a heating operation.

The temperature condition is a condition that the outlet temperature T _CHOUT is maintained near the temperature at which the operator's request can be satisfied. The setting means 51 can be operated by an operator to input temperature information indicating the required temperature. This required temperature may represent the outlet temperature T _CHOUT , but in the present embodiment, the required temperature may represent the temperature of an object whose temperature is adjusted using brine. The temperature of the object is the temperature of the atmosphere of the space to be air-conditioned when the absorption chiller / heater 2 is used for air-conditioning.

The setting means 51 initializes the target temperature T0 of the outlet temperature T _CHOUT based on the input required temperature. That is, the initial value of the target temperature T0 of the outlet temperature T _CHOUT is set. When the required temperature represents the outlet temperature T _CHOUT , the setting means 51 determines the required temperature as an initial value of the target temperature T0, and when the required temperature represents the temperature of an object whose temperature is adjusted using brine, The brine temperature at which the temperature of the object can be set to the required temperature is set to the initial value of the target temperature T0. Therefore, the temperature condition is also a condition that the outlet temperature T _CHOUT is maintained near the target temperature T0. The setting means 51 initially sets the target temperature T0 as temperature condition information based on the input temperature information.

  The control valve drive command means 52 is a driver that opens and closes the fuel supply flow rate control valve 40 in response to a signal representing a command from the control means 55. The switching valve drive command means 53 is a driver that opens and closes the cooling / heating switching valve 38 in response to a signal representing a command from the control means 55. The storage unit 54 is realized by, for example, a semiconductor memory, and stores information so as to be readable by the control unit 55. The memory | storage means 54 has memorize | stored the information which shows a combustion position as information used for control. The information indicating the combustion position includes at least the combustion state switching time and the combustion state after switching.

The control means 55 is realized by, for example, a central processing unit (abbreviated as CPU). The control means 55 includes a cooling / heating control unit 60 that switches between a cooling operation and a warming operation, and a temperature control unit 61 that controls the outlet temperature T _CHOUT . The temperature controller 61 switches the combustion state in the regenerator 5 and controls the outlet temperature T _CHOUT .

  The cooling / heating control unit 61 responds to the signal from the setting means 51 and controls the switching valve drive command means 53 by giving a signal representing the command based on the operating condition set as the control condition. When the operation condition is set to perform the cold operation, the cooling / heating control unit 61 gives a signal to instruct the switching valve drive command means 53 to close, and causes the cooling / heating switching valve 38 to close. Further, when the operation condition is set to perform a warm operation, the cooling / heating control unit 61 gives a signal to instruct the switching valve drive command means 53 to open, and causes the cooling / heating switching valve 38 to open. In this way, the cooling / heating control unit 61 performs switching control of the operation state so as to satisfy the set operation condition.

When supplying heat to the regenerator 5, the temperature control unit 61 responds to signals from the temperature detection means 50 and the setting means 51 and based on the outlet temperature T _CHOUT detected by the temperature detection means 50 and the target temperature T0. Thus, the supply heat flow rate in the regenerator 5 is controlled so that the outlet temperature T _CHOUT approaches the target temperature T0. The temperature controller 61 controls the control valve drive command means 52 to adjust the opening of the fuel supply flow rate control valve 40 in the open state, thereby controlling the amount of heat supplied. Further, when the temperature control unit 61 controls the supply heat flow rate in the heat supply execution state in the regenerator 5, the outlet temperature T _CHOUT is within the specified temperature range when the ratio of the large supply heat flow rate in the regenerator 5 is small. And the target temperature T0 is corrected so that the proportion of the state in which the supply heat flow rate is large becomes small.

The specification temperature range is the range of the outlet temperature T _CHOUT that can satisfy the operator's request, and the temperature of the object is set to the temperature required by the operator using the brine sent from the evaporator 7. The range of the adjustable outlet temperature T _CHOUT . Therefore, the specification temperature range is a temperature range near the initial value of the target temperature T0, and is a temperature range based on the initial value of the target temperature T0. The specification temperature range is, for example, a temperature range having a predetermined temperature range around the initial value of the target temperature T0. For example, the specification temperature range is a temperature range of the initial value ± 1 ° C. of the target temperature T0. This specification temperature range is set by the temperature control unit 61.

Further, the temperature control unit 61 responds to signals from the temperature detection means 50 and the setting means 51, and the outlet temperature T _CHOUT detected by the temperature detection means 50 and the heat supply start temperature set based on the target temperature T0 and Based on the heat supply stop temperature, the heat supply execution and the heat supply stop in the regenerator 5 are controlled. The temperature control unit 61 controls the control valve drive command means 52 to control the supply heat quantity by opening and closing the fuel supply flow control valve 40. Furthermore, when the temperature control unit 61 controls the heat supply execution and the heat supply stop in the regenerator 5, when the proportion of the heat supply execution state in the regenerator 5 is small, the outlet temperature T _CHOUT falls within the specified temperature range, and The heat supply start temperature and the heat supply stop temperature are corrected so that the proportion of the heat supply execution state is reduced.

  In the temperature control unit 61, when the fuel supply and the fuel supply stop control operation are prioritized and heat is supplied, the supply heat flow control operation is executed. In this manner, the temperature controller 61 controls the heat flow rate supplied to the solution by the regenerator 5.

  FIG. 2 is a block diagram illustrating a configuration for a high / low switching control operation in the temperature control unit 61 during a cold operation. The high / low switching control operation is a supply heat flow control operation for controlling the supply heat flow when the regenerator 5 supplies heat to the solution. In the present embodiment, the temperature control unit 61 controls the supply heat flow rate in two stages, large and small. The temperature control unit 61 includes a heat supply control unit 65 that is a basic logic unit and a correction unit 66 that is a correction logic unit.

The heat supply control unit 65 includes a deviation calculation unit 70, a control calculation unit 71, a switching determination unit 72, and a control command unit 73. The deviation calculating unit 70 subtracts the outlet temperature T _CHOUT from the target temperature T0 to obtain the deviation. The control calculation unit 71 executes a control calculation including at least a proportional operation with respect to the deviation obtained by the deviation calculation unit 70, and in this embodiment, a control calculation including a proportional operation, an integration operation, and a differential operation.

The control calculation unit 71, when the outlet temperature T _CHOUT rises, a calculation result calculated output value MV increases, the outlet temperature T _CHOUT is lowered, as a computation result computed output value MV is low, calculates .

The switching determination unit 72 compares the calculation output value MV, which is the calculation result in the control calculation unit 71, with the high combustion switching threshold MV _HI and the low combustion switching threshold MV _LO, and sets the combustion state to the high (HI) combustion state and the low combustion state. (LO) It is determined whether the combustion state is set. The high combustion switching threshold MV _HI and the low combustion switching threshold MV _LO are values determined by the configuration of the absorption chiller / heater 2, and the high combustion switching threshold MV _HI is a value larger than the low combustion switching threshold MV _LO ( MV _HI > MV _LO ). When the calculated output value MV exceeds the high combustion switching threshold MV _HI (MV> MV _HI ), the switching determination unit 72 determines that the combustion state is high, and the calculated output value MV is less than the low combustion switching threshold MV _LO (MV <MV _LO ), it is determined that the combustion state is low, and if the calculated output value MV is not less than the low combustion switching threshold MV _{LO and not} more than the high combustion switching threshold MV _HI (MV _LO ≦ MV ≦ MV _HI ), the combustion state at that time is determined. It is determined to be retained.

  Based on the determination result in the switching determination unit 72, the control command unit 73 commands the combustion HI / LO, that is, a signal for commanding whether the combustion state is set to the high combustion state or the low combustion state. Provided to means 52. In the control command unit 73, when the determination in the switching determination unit 72 is switched from the low combustion state to the high combustion state, a signal for commanding the combustion state to the high combustion state is given to the control valve drive command means 52. As a result, the fuel supply flow rate control valve 40 is switched to the fully open state by the control valve drive command means 52, and the combustion state is switched to the high combustion state. Further, in the control command unit 73, when the determination in the switching determination unit 72 is switched from the high combustion state to the low combustion state, a signal for instructing to set the combustion state to the low combustion state is given to the control valve drive command means 52. . As a result, the fuel supply flow control valve 40 is switched to the intermediate open state by the control valve drive command means 52, and the combustion state is switched to the low combustion state.

Heat supply controller 65 in this way, the outlet temperature _{T CHOUT} of brine that is detected by the temperature detecting means 50, based on the target temperature T0, as the outlet temperature _{T CHOUT} of the brine to approach the target temperature T0, Control the supply heat flow in the regenerator.

The high combustion switching threshold value MV _HI and the low combustion switching threshold value MV _LO are set in advance so that the outlet temperature T _CHOUT obtained by the control as described above falls within the control temperature range based on the target temperature T0. The control temperature range is a range having a temperature range smaller than the temperature range of the specification temperature range, for example, a temperature range having a predetermined temperature range up and down around the target temperature T0. The temperature range is T0 ± 0.5 ° C.

As described above, the high combustion state is a state in which fuel supplied by the fuel supply flow rate control valve 40 is fully opened, and the low combustion state is supplied by the fuel supply flow rate control valve 40 in an intermediate open state. This is a state where fuel is burned. The opening degree in the intermediate open state is 50%, which is half of the opening degree in the fully open state as 100%. Therefore, when the supply heat flow rate given to the solution in the high combustion state is rated (= 100%), the supply heat flow rate given to the solution in the low combustion state is 50%, half. The high combustion switching threshold MV _HI is a threshold for switching to a high combustion state at which the rated supply heat flow rate is achieved, and the low combustion switching threshold MV _LO is for switching to a low combustion state at which the supply heat flow rate is 50% of the rated supply heat flow rate. Is the threshold value.

The closer the high combustion switching threshold MV _HI and the low combustion switching threshold MV _LO are, the more frequently the switching operation that switches the combustion state between the high combustion state and the low combustion state. Therefore, based on the result of at least one of the experiment and the simulation, high combustion is performed so that the number of switching per unit time, for example, per hour is not more than a predetermined number and the outlet temperature T _CHOUT is within the control temperature range. A switching threshold MV _HI and a low combustion switching threshold MV _LO are set.

  The correction unit 66 includes a correction amount calculation unit 75 and a correction processing calculation unit 76. The correction amount calculation unit 75 calculates the load state of the absorption chiller / heater 2 and calculates the target temperature correction amount Trs1 corresponding to the load state. The load state of the absorption chiller / heater 2 is determined by the proportion of the state in which the supply heat flow rate in the regenerator 5 is large. The state where the supply heat flow rate is large is a state equal to or greater than a predetermined threshold value. In the present embodiment, the threshold is set between the supply heat flow rate in the high combustion state and the supply heat flow rate in the low combustion state, and the high combustion state becomes a state in which the supply heat flow rate is large. In the cold operation state, the correction processing calculation unit 76 adds the target temperature correction amount Trs1 obtained by the correction amount calculation unit 75 to the initial value of the target temperature T0 set by the setting unit 52 to increase the target temperature T0. Correct as follows. The corrected target temperature T0 is given to the deviation calculator 70.

FIG. 3 is a block diagram illustrating a configuration for the combustion execution and the combustion stop switching control operation in the temperature control unit 61 during the cold operation. In the switching determination unit 72 of the heat supply control unit 65, in addition to the above-described determination of the high combustion state and the low combustion state, the combustion execution and the combustion stop are determined. The switching determination unit 72 _{compares the} outlet temperature T _CHOUT detected by the temperature detection means 50 with the combustion start temperature T _{ON SP} that is the heat supply start temperature and the combustion stop temperature T _{OFF SP} that is the heat supply stop temperature, It is determined whether the combustion state is a combustion execution state or a combustion stop state. The combustion start temperature T _{ON SP} is larger than the combustion stop temperature T _{OFF SP} (T _{ON SP} > T _{OFF SP} ).

Each initial value of the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} is determined based on the initial value of the target temperature T0. Combustion stop plays a role of prevention of freezing due to supercooling in addition to temperature controllability.In combustion execution and combustion stop switching control operation, control calculation value is not used directly like high-low switching control operation, but directly at temperature. Switch control. As a result, it is possible to reduce the amount of calculation and simplify the calculation, thereby achieving the effect of preventing calculation errors. Therefore, the initial value of the combustion stop temperature T _{OFF SP} is _supercooled when the outlet temperature T _CHOUT is cooled below this temperature, so there is no need to execute combustion, or the absorption chiller / heater may be damaged. Is set at or based on a temperature. After the initial value of the combustion stop temperature T _{OFF SP} satisfies such conditions, the initial values of the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} are such that the outlet temperature T _CHOUT is equal to or lower than the combustion start temperature T _{ON SP.} When the combustion start temperature T _{ON SP} is exceeded and the combustion start temperature T _{ON SP} is exceeded, the combustion is switched to the combustion execution state, and when the outlet temperature T _CHOUT decreases from the temperature _equal to or higher than the combustion stop temperature T _{ON SP} and becomes less than the combustion stop temperature T _{OFF SP} , By controlling to switch to the combustion stop state, the obtained outlet temperature T _CHOUT is set so as to be within the aforementioned control temperature range.

In the switching determination unit 72, when the outlet temperature T _CHOUT exceeds the combustion start temperature T _{ON SP} (T _CHOUT > T _{ON SP} ), it is determined as a combustion execution state, and the outlet temperature T _CHOUT is less than the combustion stop temperature T _{OFF SP} (T _{In the case of CHOUT} > T _{ON SP} ), it is determined that the combustion is stopped, and the outlet temperature T _CHOUT is _equal to or higher than the combustion stop temperature T _{OFF SP and lower} than the combustion start temperature T _{ON SP} (T _{OFF SP} ≦ T _CHOUT ≦ T _{ON SP} ). It is determined that the combustion state at that time is maintained.

  Further, the control command unit 73 gives a signal to the control valve drive command means 52 that commands whether to change the combustion state to the combustion execution state or the combustion stop state based on the determination result in the switching determination unit 72. In the control command unit 73, when the determination in the switching determination unit 72 is switched from the combustion stop state to the combustion execution state, a signal for instructing to change the combustion state to the combustion execution state is given to the control valve drive command means 52. As a result, the fuel supply flow rate control valve 40 is switched to the open state by the control valve drive command means 52, and the combustion state is switched to the combustion execution state. Further, in the control command unit 73, when the determination in the switching determination unit 72 is switched from the combustion execution state to the combustion stop state, a signal for instructing to set the combustion state to the combustion stop state is given to the control valve drive command means 52. . As a result, the fuel supply flow control valve 40 is switched to the fully closed state by the control valve drive command means 52, and the combustion state is switched to the combustion stopped state.

  The temperature control unit 61 executes the combustion execution and the combustion stop switching control operation with priority over the high / low switching control operation. In the combustion execution and combustion stop switching control operation, when the switching determination unit 72 determines to switch from the combustion execution state to the combustion stop state and to determine to maintain the combustion stop state, the temperature control unit 61 Switching control operation is not executed. In contrast, in the combustion execution and combustion stop switching control operation, when the switching determination unit 72 determines to switch from the combustion stop state to the combustion execution state, and when it is determined that the combustion execution state is maintained and continued, The temperature control unit 61 also performs a high / low switching control operation.

In this way, the heat supply control unit 65 detects the outlet temperature T _CHOUT detected by the temperature detection means 50, the combustion start temperature T _{ON SP} that is the heat supply start temperature set based on the target temperature T0, and the heat supply stop. Based on the combustion stop temperature T _{OFF SP} that is the temperature, the heat supply execution and the heat supply stop in the regenerator 5 are controlled so that the outlet temperature T _CHOUT approaches the target temperature T0.

The correction unit 66 corrects the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} . The correction amount calculation unit 75 calculates the load state of the absorption chiller / heater 2 and calculates the switching temperature correction amount Trs2 corresponding to the load state. The load state of the absorption chiller / heater 2 is determined by the ratio of the combustion execution state that is the heat supply execution state in the regenerator 5. In the cold operation state, the correction processing calculation unit 76 adds the switching temperature correction amount Trs2 obtained by the correction amount calculation unit 75 to the initial values of the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} , respectively, and performs combustion. The start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} are corrected to be higher. The switching determination unit 72 uses the corrected combustion start temperature T _{ON SP} and combustion stop temperature T _{OFF SP} to determine whether the combustion state is the combustion execution state or the combustion stop state.

  Furthermore, when controlling to switch, the control command unit 73 gives the storage means 54 information indicating the switching time and the combustion state after switching. That is, when the control unit 73 controls the combustion state to be switched to the high combustion state, the control unit 73 provides the storage unit 54 with information indicating that the time and the combustion state after switching are high combustion. In addition, when the control command unit 73 controls the combustion state to be switched to the low combustion state, the control unit 73 provides the storage means 54 with information indicating that the time and the combustion state after the switching are the low combustion state. . When the control command unit 73 controls the combustion state to be switched to the combustion stop state, the control unit 73 gives the storage means 54 information indicating that the time and the combustion state after the switching are the combustion stop state. .

  FIG. 4 is a block diagram showing a configuration for obtaining the target temperature correction amount Trs1 of the correction amount calculation unit 75. The correction amount calculation unit 75 includes a load calculation unit 77 and a correction amount calculation unit 78. The load calculation unit 77 obtains the load state of the absorption chiller / heater 2. The load is difficult to detect directly, and in the high / low switching control operation, the ratio of the state in which the supply heat flow rate in the regenerator 5 is large is obtained as an index representing the load. Since the high combustion state corresponds to the state in which the supply heat flow rate in the regenerator 5 is large, the ratio of the state in which the supply heat flow rate in the regenerator 5 is large is obtained as the high combustion rate Duty1. The high combustion rate Duty1 is obtained by the equation (1) from the duty ratio (= Δt1 / t1) between the high combustion cycle t1 and the high combustion time Δt1.

  The high combustion cycle t1 is a cycle of the switching time to the high combustion state. In the present embodiment, the switching time to the high combustion state closest to the current time, the switching time to the previous high combustion state, It is a cycle. The high combustion time Δt1 is the time of the high combustion state in the high combustion cycle t1, and in the present embodiment, from the switching time to the high combustion state immediately before the switching time to the high combustion state closest to the current time. The time with the switching time when the high combustion state switches to another combustion state. The duty ratio (= Δt1 / t1) between the high combustion cycle t1 and the high combustion time Δt1 is read from the information indicating the combustion state switching time and the combustion state after switching, which is stored in the storage means 54. calculate. In the load calculation part 77, the high combustion rate Duty1 is calculated | required as information showing a load state.

  Based on the high combustion rate Duty1 obtained by the load calculation unit 77, the correction amount calculation unit 78 obtains the target temperature compensation amount Trs1 by the equation (2).

In Expression (2), Duty _LIM1 is a target temperature correction upper limit rate, and K _Duty1 is a target temperature correction gain.

When the absorption chiller / heater 2 is in a high load state, the correction of the target temperature T0 is prohibited, and the target temperature is only obtained when the absorption chiller / heater 2 is in a medium load state and a low load state other than the high load state. In order to correct T0, the control device 1 corrects the target temperature T0 only when the high combustion rate Duty1 falls within the range of Expression (3).
0 <Duty1 <Duty _LIM1 (3)

The target temperature correction upper limit rate Duty _LIM1 corresponds to a load state delimiter in which a state in which the high combustion rate Duty1 is equal to or higher than the target temperature correction upper limit rate Duty _LIM1 is a high load state. The target temperature correction upper limit rate Duty _LIM1 is appropriately determined based on the configuration of the absorption chiller / heater 2 and the like. For example, it is 50. In this case, a state where the high combustion rate Duty1 is 50 or more is a high load state. is there.

When the high combustion rate Duty1 is less than the target temperature correction upper limit rate Duty _LIM1 , the correction amount calculating unit 78 obtains the target temperature compensation amount Trs1 by the equation (2), and the high combustion rate Duty1 is determined as the target temperature correction upper limit rate. In the case of Duty _LIM1 or more, the target temperature compensation amount Trs1 is set to zero. Accordingly, the absorption chiller / heater 2 is in a medium load state and a low load state other than the high load state by correcting the target temperature T0 only when the high combustion rate Duty1 is less than the target temperature correction upper limit rate Duty _LIM1. Only in this case, the target temperature T0 can be corrected.

The target temperature correction gain K _Duty1 is appropriately determined based on the configuration of the absorption chiller / heater 2 and the like. This target temperature correction gain K _Duty1 is obtained by subtracting the value obtained by subtracting the temperature range of the control temperature range from the temperature range of the specified temperature range, when the target temperature correction amount Trs1 when the high combustion rate Duty1 is assumed to be 0. It is determined to be below the divided temperature. Thus, even if the target temperature T0 is corrected by the target temperature correction amount Trs1, the outlet temperature T _CHOUT can be _kept within the specified temperature range.

The target temperature correction amount Trs1 obtained by the correction amount calculation 75 having such a configuration is given to the correction processing unit 76, and the target temperature T0 is corrected. In this way, when the proportion of the state where the supply heat flow rate in the regenerator 5 is large is small, the correction unit 66 has the outlet temperature T _CHOUT within the specified temperature range with the target temperature T0 initially set by the setting means 51 as a reference. The target temperature T0 is corrected so that the proportion of the state in which the heat flow rate falls and the supply heat flow rate is large becomes small.

FIG. 5 is a block diagram illustrating a configuration for obtaining the switching temperature correction amount Trs2 of the correction amount calculation unit 75. The above-described high combustion rate Duty1 is suitable as an index representing a load for correcting the target temperature T0 in the high / low switching control operation. However, in the combustion execution and combustion stop switching control operations, the combustion start temperature T _{ON SP} and the combustion As an index representing the load for correcting the stop temperature T _{OFF SP} , the ratio of the heat supply execution state in the regenerator 5 is more suitable. Therefore, in the high / low switching control operation, the load calculation unit 77 obtains the ratio of the heat supply execution state in the regenerator 5 as an index indicating the load. The ratio of the heat supply execution state in the regenerator 5 is obtained as the combustion execution rate Duty2 because the combustion execution state corresponds to the heat supply execution state in the regenerator 5. The combustion execution rate Duty2 is obtained from Equation (4) from the duty ratio (= Δt2 / t2) between the combustion execution cycle t2 and the combustion execution time Δt2.

  The combustion execution cycle t2 is a cycle of the switching time to the combustion execution state. In the present embodiment, the switching time to the combustion execution state closest to the current time, the switching time to the combustion execution state immediately before that, It is a cycle. The combustion execution time Δt2 is the time of the combustion execution state within the combustion execution cycle t2, and in the present embodiment, from the switching time to the combustion execution state immediately before the switching time to the combustion execution state closest to the current time. The time when the combustion execution state is switched to the combustion stop state is the time. As the duty ratio (= Δt2 / t2) between the combustion execution period t2 and the combustion execution time Δt2, information indicating the combustion state switching time and the combustion state after the switching, which is stored in the storage means 54, is read out from this information. calculate. In the load calculation part 77, the combustion execution rate Duty2 is calculated | required as information showing a load state.

  Based on the combustion execution rate Duty2 obtained by the load calculation unit 77, the correction amount calculation unit 78 obtains the target temperature restriction amount Trs2 by Expression (5).

In Expression (5), Duty _LIM2 is a switching temperature correction upper limit rate, and K _Duty2 is a switching temperature correction gain.

When the absorption chiller / heater 2 is in a high load state, the correction of the target temperature T0 is prohibited, and the target temperature is only obtained when the absorption chiller / heater 2 is in a medium load state and a low load state other than the high load state. In order to correct T0, the control device 1 corrects the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} only when the combustion execution rate Duty2 falls within the range of the equation (6).
0 <Duty2 <Duty _LIM2 (6)

The switching temperature correction upper limit rate Duty _LIM2 corresponds to a load state delimiter in which a state where the combustion execution rate Duty2 is equal to or higher than the switching temperature correction upper limit rate Duty _LIM2 is set to a high load state. The switching temperature correction upper limit rate Duty _LIM2 is appropriately determined based on the configuration of the absorption chiller / heater 2 or the like. For example, it is 50. In this case, a state where the combustion execution rate Duty2 is 50 or more is a high load state. is there.

When the combustion execution rate Duty2 is less than the switching temperature correction upper limit rate Duty _LIM2 , the correction amount calculation unit 78 obtains the switching temperature compensation amount Trs2 by the equation (5), and the combustion execution rate Duty2 is determined as the switching temperature correction upper limit rate. In the case of Duty _LIM2 or more, the switching temperature compensation amount Trs2 is set to zero. As a result, only when the combustion execution rate Duty2 is less than the switching temperature correction upper limit rate Duty _{LIM2, by} correcting the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} , the absorption chiller water heater 2 is not in a high load state. The combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} can be corrected only in the middle load state and the low load state.

The switching temperature correction gain K _Duty2 is appropriately determined based on the configuration of the absorption chiller / heater 2. This switching temperature correction gain K _Duty2 is obtained by subtracting the value obtained by subtracting the temperature width of the control temperature range from the temperature width of the specified temperature range, when the switching temperature correction amount Trs2 when it is assumed that the combustion execution rate Duty2 is 0. It is determined to be below the divided temperature. Thus, even if the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} are corrected by the switching temperature correction amount Trs2, it is possible to keep the outlet temperature T _CHOUT within the specified temperature range.

The switching temperature correction amount Trs2 obtained by the correction amount calculation unit 75 having such a configuration is given to the correction processing unit 76, and the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} are corrected. Correcting unit 61 in this manner, when the ratio of combustion execution condition is heat supply execution state in the regenerator 5 is small, the specifications relative to the target temperature T0 of the outlet temperature T _CHOUT is initialized by setting means 51 The combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} are corrected so that they fall within the temperature range and the proportion of the combustion execution state becomes small.

  FIG. 6 is a block diagram illustrating a configuration for a high / low switching control operation in the temperature control unit 61 during a warm operation. The configuration for the high / low switching control operation during the warm operation is similar to the configuration for the high / low switching control operation during the cold operation, and only different configurations will be described.

During the cold operation, the control calculation unit 71 increases the calculation output value MV as a calculation result when the outlet temperature T _CHOUT is high, and _decreases the calculation output value MV as a calculation result when the outlet temperature T _CHOUT is low. However, during the warm operation, the control calculation unit 71 reduces the calculation output value MV as the calculation result when the outlet temperature T _CHOUT increases, and calculates the calculation output value as the calculation result when the outlet temperature T _CHOUT decreases. Calculation is performed so that MV becomes large. During the cold operation, the correction processing unit 76 corrects the target temperature T0 by adding the target temperature correction amount Trs1 to the initial value of the target temperature T0. However, during the warm operation, the correction processing unit 76 performs the target temperature T0. The target temperature correction amount Trs1 is subtracted from the initial value to correct the target temperature T0. Other configurations are the same.

  FIG. 7 is a block diagram illustrating a configuration for performing combustion and stopping combustion control in the temperature control unit 61 during a warm operation. The configuration for the combustion execution and the combustion stop switching control operation during the warm operation is similar to the configuration for the combustion execution and the combustion stop switching control operation during the cold operation, and only different configurations will be described.

During warm operation, combustion stop plays a role of preventing overheating in addition to temperature controllability, and in combustion execution and combustion stop switching control operation, control calculation values are not used directly like high-low switching control operation, but directly Switch control with temperature. As a result, it is possible to reduce the amount of calculation and simplify the calculation, thereby achieving the effect of preventing calculation errors. The initial value of the combustion stop temperature T _{OFF SP} is overheated when the outlet temperature T _CHOUT is heated below this temperature, so there is no need to perform combustion or the absorption chiller / heater may be damaged. Set to or based on temperature. After the initial value of the combustion stop temperature T _{OFF SP} satisfies such conditions, the initial values of the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} are such that the outlet temperature T _CHOUT is equal to or lower than the combustion start temperature T _{ON SP.} When the combustion start temperature T _{ON SP} is exceeded and the combustion start temperature T _{ON SP} is exceeded, the combustion is switched to the combustion execution state, and when the outlet temperature T _CHOUT decreases from the temperature _equal to or higher than the combustion stop temperature T _{ON SP} and becomes less than the combustion stop temperature T _{OFF SP} , By controlling to switch to the combustion stop state, the obtained outlet temperature T _CHOUT is set so as to be within the aforementioned control temperature range. In the cold operation, the combustion start temperature T _{ON SP} is larger than the combustion stop temperature T _{OFF SP} (T _{ON SP} > T _{OFF SP} ), but in the warm operation, the combustion start temperature T _{ON SP} is It is a value smaller than the combustion stop temperature T _{OFF SP} (T _{ON SP} <T _{OFF SP} ).

Further, during the cold operation, the correction processing unit 76 adds the switching temperature correction amount Trs2 to the initial value of the combustion start temperature T _{ON SP and} the initial value of the combustion stop temperature T _{OFF SP} , and thereby calculates the combustion start temperature T _{ON SP} and the combustion. Although the stop temperatures T _{OFF SP} are respectively corrected, during the warm operation, the correction processing unit 76 subtracts the switching temperature correction amount Trs2 from the initial value of the combustion start temperature T _{ON SP and} the initial value of the combustion stop temperature T _{OFF SP.} Thus, the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} are respectively corrected. Other configurations are the same.

FIG. 8 is a flowchart showing a cold operation temperature control operation in the control means 55. The cold operation temperature control operation is a control operation according to the control method of the absorption refrigeration apparatus of the present invention. The control means 55 is set to a cold operation state under the control of the cooling / heating control unit 60, and based on the operation of the setting means 51 by the operator, after the operation of the absorption chiller / heater 2 is started, a predetermined set time, for example, 2 When the time has elapsed, in step s0, the cold operation temperature control operation is started, and the process proceeds to step s1. In step s1, the heat supply control unit 65 receives a signal from the temperature detecting means 50 and acquires the detected outlet temperature T _CHOUT .

In step s2, the correction unit 66 calculates the switching temperature correction amount Trs2. In this step s2, first, the load calculation unit 77 of the correction amount calculation unit 75 in the correction unit 66 calculates the combustion execution rate Duty2 by the equation (4). When the combustion execution rate Duty2 is less than the switching temperature correction upper limit rate Duty _{LIM2 in} the correction amount calculation unit 78 of the correction amount calculation unit 75, the switching temperature correction amount Trs2 is calculated by Equation (5), and the combustion execution rate Duty2 is calculated. When the switching temperature correction upper limit rate Duty _LIM2 or more, the switching temperature correction amount Trs2 is set to zero.

In step s3, the correction unit 66 corrects the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} , respectively. In step s3, the correction processing unit 76 of the correction unit 66, the initial value of the combustion initiation temperature _{T ON SP,} by adding the switching temperature correction amount Trs2, correcting the combustion initiation temperature _{T ON SP,} the combustion stop temperature T _The switching temperature correction amount Trs2 is added to the initial value of _{OFF SP} to correct the combustion stop temperature T _{OFF SP} .

In step s4, the heat supply control unit 65 determines whether to execute combustion or stop combustion. In the step s4, the switching judgment unit 72 of the heat supply controller 65, as described _above, in the case of _{T CHOUT> T ON SP,} determines that the combustion run _state, when the _{T CHOUT> T ON SP,} combustion stopped state If T _{OFF SP} ≦ T _CHOUT ≦ T _{ON SP} , it is determined that the combustion state at that time is maintained. If it is determined on the basis of these conditions that the combustion is being performed, the process proceeds to step s5. If it is determined that the combustion is stopped, the process proceeds to step s12.

In step s5, the correction unit 66 calculates and obtains the target temperature correction amount Trs1. In step s5, first, the load calculation unit 77 of the correction amount calculation unit 75 in the correction unit 66 calculates the high combustion rate Duty1 according to the equation (1). When the high combustion rate Duty1 is less than the target temperature correction upper limit rate Duty _{LIM1 in} the correction amount calculation unit 78 of the correction amount calculation unit 75, the target temperature correction amount Trs1 is calculated by the equation (2), and the high combustion rate Duty1 is calculated. When the target temperature correction upper limit rate is Duty _LIM1 or more, the target temperature correction amount Trs1 is set to zero.

In step s6, the correction unit 66 corrects the target temperature T0. In step s6, the correction processing unit 76 of the correction unit 66 corrects the target temperature T0 by adding the target temperature correction amount Trs1 to the initial value of the target temperature T0. In step s7, the heat supply control unit 65 calculates the deviation. In step s7, the deviation calculator 70 of the heat supply controller 65 subtracts the outlet temperature T _CHOUT from the corrected target temperature T0 to obtain the deviation. In step s8, the heat supply control unit 65 performs a control calculation on the deviation. In step s8, the control calculation unit 71 of the heat supply control unit 65 executes control calculations including a proportional operation, an integration operation, and a differential operation on the deviation obtained by the deviation calculation unit 70, and outputs a control calculation output value MV. Ask for.

In step s9, the heat supply control unit 65 determines whether to set the high combustion state or the low combustion state. In step s9, as described above, the switching determination unit 72 of the heat supply control unit 65 determines that the combustion state is high when MV> MV _HI , and determines that the combustion state is low when MV <MV _LO . When MV _LO ≦ MV ≦ MV _HI , the combustion state at that time is determined to be held. If it is determined that the combustion state is low, the process proceeds to step s10. If the combustion state is determined to be high, the process proceeds to step s13.

  In step s10, the heat supply controller 65 controls the control valve drive command means 52 so that the combustion state in the regenerator 5 becomes a low combustion state. In step s10, if the current combustion state is the low combustion state in the control command unit 73 of the heat supply control unit 65, the command to the control valve drive command means 52 is not particularly given, and the current combustion state is low. If it is other than the combustion state, a signal for commanding the combustion state to be in the low combustion state is given to the control valve drive command means 52. As a result, the combustion state is controlled to a low combustion state. Then, the process returns to step s1.

  In step s11, the heat supply control unit 65 controls the control valve drive command means 52 so that the combustion state in the regenerator 5 becomes the combustion stop state. In step s12, if the current combustion state is the combustion stop state in the control command unit 73 of the heat supply control unit 65, no command is given to the control valve drive command means 52, and the current combustion state is combusted. If it is other than the stop state, a signal for instructing the combustion state to become the combustion stop state is given to the control valve drive command means 52. Thus, the combustion state is controlled to the combustion stop state. Then, the process returns to step s1.

  In step s12, the heat supply controller 65 controls the control valve drive command means 52 so that the combustion state in the regenerator 5 becomes a high combustion state. In step s13, if the current combustion state is the high combustion state in the control command unit 73 of the heat supply control unit 65, the command to the control valve drive command means 52 is not particularly given, and the current combustion state is high. If it is other than the combustion state, a signal for instructing the combustion state to be in the high combustion state is given to the control valve drive command means 52. As a result, the combustion state is controlled to a high combustion state. Then, the process returns to step s1.

The control means 55 is set to a cold operation state under the control of the cooling / heating control unit 60, and based on the operation of the setting means 51 by the operator, after the operation of the absorption chiller / heater 2 is started, a predetermined set time, for example, 2 Until the time elapses, a control operation that does not correct the combustion start temperature T _{ON SP, the} combustion stop temperature T _{OFF SP,} and the target temperature T0 is executed. Therefore, in the cold operation temperature control operation shown in FIG. 8, the control means 55 executes a control operation in which the switching temperature correction amount Trs2 is set to 0 in step s2, and the target temperature correction amount Trs1 is set to 0 in step s6.

  FIG. 9 is a flowchart showing a warm operation temperature control operation in the control means 55. The warm operation temperature control operation is a control operation according to the control method of the absorption refrigeration apparatus of the present invention. The warm operation temperature control operation is similar to the cold operation temperature control operation, and only a different configuration will be described. The control means 55 is set in a warm operation state under the control of the cooling / heating control unit 60, and based on the operation of the setting means 51 by the operator, after the absorption chiller / heater 2 starts operating, a predetermined set time, for example, 2 When the time has elapsed, in step s0, the cold operation temperature control operation is started, and the process proceeds to step s1. Steps a1 and a2 are the same operations as steps s1 and s2 of the cold operation temperature control operation.

In step a3, the correction unit 66 corrects the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} . In step s3, the correction processing unit 76 of the correction unit 66, from an initial value of the combustion initiation temperature _{T ON SP,} subtracts the switching temperature correction amount Trs2, correcting the combustion initiation temperature _{T ON SP,} the combustion stop temperature T _The switching temperature correction amount Trs2 is subtracted from the initial value of _{OFF SP} to correct the combustion stop temperature T _{OFF SP} .

  Steps a4 to a5 are the same operations as steps s4 to s5 of the cold operation temperature control operation. In step a6, the correction unit 66 corrects the target temperature T0. In step a6, the correction processing unit 76 of the correction unit 66 corrects the target temperature T0 by subtracting the target temperature correction amount Trs1 from the initial value of the target temperature T0. Steps a7 to a13 are the same operations as steps s7 to s13 of the cold operation temperature control operation.

The control means 55 is set in a warm operation state under the control of the cooling / heating control unit 60, and based on the operation of the setting means 51 by the operator, after the absorption chiller / heater 2 starts operating, a predetermined set time, for example, 2 Until the time elapses, a control operation that does not correct the combustion start temperature T _{ON SP, the} combustion stop temperature T _{OFF SP,} and the target temperature T0 is executed. Therefore, in the warm operation temperature control operation shown in FIG. 9, the control means 55 executes a control operation in which the switching temperature correction amount Trs2 is set to 0 in step a2, and the target temperature correction amount Trs1 is set to 0 in step a6.

According to the present embodiment, the control means 55 has the heat supply control unit 65, and the combustion state in the regenerator 5 is controlled based on the detected outlet temperature T _CHOU and the target temperature T0. . First, based on the detected outlet temperature T _CHOUT and the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} set based on the target temperature T0, the combustion state in the regenerator 5 is the combustion execution state and the combustion state. Controlled to one of the stopped states. Further, in the combustion execution state, the combustion state in the regenerator 5 is controlled to either the high combustion state or the low combustion state so that the detected outlet temperature T _CHOUT approaches the target temperature T0. As a result, a brine having a temperature close to the target temperature T0 is obtained, and the brine can be suitably used.

Further, the control means 55 has a correction unit 65, which corrects the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} in the combustion execution and combustion stop switching control operations, and in the high / low switching control operation, The target temperature T0 is corrected. This shortens the time of the combustion execution state in the regenerator 5, shortens the time of the high combustion state even in the combustion execution state, and lengthens the time of the combustion stop state and the low combustion state, thereby realizing energy saving. Can do.

Moreover, the correction of the combustion start temperature T _{ON SP, the} combustion stop temperature T _{OFF SP,} and the target temperature T0 are corrections such that the outlet temperature T _CHOUT falls within the specified temperature range. Therefore, the outlet temperature T _CHOUT does not deviate from the specified temperature range, and high temperature controllability can be maintained. In addition, the control means 55 corrects the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} and the target temperature T0 only when the absorption chiller / heater 2 is in a medium load state and a low load state. Therefore, even if the load of the absorption chiller / heater 2 fluctuates so as to increase, the outlet temperature T _CHOUT can be easily set within the specified temperature range after the load fluctuates by switching the combustion state in the regenerator 5 to the high combustion state. And high temperature controllability can be maintained.

In addition, the above-described control can suppress the switching of the combustion state to the high combustion state in the medium load state and the low load state. The number of times of switching the combustion state can be reduced, and the life of the absorption chiller / heater 2 can be extended. Further, until the set time elapses from the start of operation of the absorption chiller / heater 2, the combustion start temperature T _{ON SP, the} combustion stop temperature T _{OFF SP,} and the target temperature T0 are not corrected, that is, the respective correction amounts Trs1, Trs2 are set to 0. By doing so, it is possible to maintain high temperature controllability in a short time after the start of operation where it is difficult to accurately grasp the load state.

  Moreover, since the time ratio of the combustion state in the regenerator 5 is used as an index representing the load state of the absorption chiller / heater 2, it is not affected by the environment such as the ambient temperature of the absorption chiller / heater 2 and the outside air temperature. The load state can be grasped relatively accurately and can be suitably controlled. In addition, since the combustion state ratio is determined not based on the unit time but based on the combustion state switching period, the combustion state ratio that faithfully represents the current load state can be determined and controlled appropriately. be able to.

As described above, the combustion execution and combustion stop switching control operations play a role in preventing overcooling during the cold operation and overheating during the warm operation. Therefore, the combustion execution and combustion stop switching control operations play the role of a safety circuit, and control is performed by directly comparing the temperatures. With such a configuration, it is possible to reduce the amount of calculation, reduce calculation errors, and increase reliability. There is also an advantage that the operator can easily understand the control state intuitively. Since the high / low switching control operation does not need to play a role of preventing overcooling during cold operation and overheating during warm operation, a control calculation by the control calculation unit 71 is executed, and a response of the outlet temperature T _{CHOUT to} the target temperature T0 And good follow-up performance. As described above, an excellent control operation can be executed by making the control different between the combustion execution and combustion stop switching control operation and the height switching control operation.

  FIG. 10 is a graph showing a simulation result of the cold operation temperature control operation by the control means 55. Table 1 shows the simulation results shown in FIG.

The inventors of the present invention verified the effect of the present invention by simulation. In the simulation showing the results in FIG. 10, the correction of the combustion start temperature T _{ON SP} and the combustion stop temperature T _{OFF SP} and the target temperature T0 is invalidated until the time (Time) 50 min, and then the combustion start temperature T _{ON SP} and the combustion Correction of the stop temperature T _{OFF SP} and the target temperature T0 was made effective. The fuel consumption was compared before and after the correction was disabled and enabled. As a result, as is clear from FIG. 10 and Table 1, by performing the correction according to the present invention, the fuel consumption is reduced and the combustion state switching cycle per unit time is lengthened as compared with the case where the correction is not performed. It was confirmed that the number of switching times can be suppressed. _Further , it was confirmed that the outlet temperature T _CHOUT can be _kept within the specified temperature range even when correction of the combustion start temperature T _{ON SP, the} combustion stop temperature T _{OFF SP} and the target temperature T0 is applied.

Here, in the simulation, the initial value of the target temperature was 7 ° C., and the specified temperature range was 7 ° C. ± 1 ° C. The duty ratio is a duty ratio (= Δt1 / t1) between the high combustion cycle t1 and the high combustion time Δt1. The combustion consumption ratio is a value with the combustion consumption F per unit time when not corrected as 100. The fuel consumption amount F per unit time is a duty ratio (= Δt1 / t1) of Duty, a combustion consumption amount in a high combustion state is F _HI, and a combustion consumption amount in a low combustion state is a combustion consumption amount in a high combustion state. It _{calculated |} required by Formula (7) as a half ( _0.5xFHI ). It was assumed that there was no fuel stop condition.

  The above-described embodiments are examples of the present invention and do not limit the present invention. For example, the control calculation in the control calculation unit 71 is not limited to the proportional integral partial calculation, and may be other control calculations such as a proportional calculation, a proportional integration calculation, and a proportional differential calculation. Further, the heat flow rate supplied to the solution in the regenerator 5 may be controlled in two steps, four steps or more, or in a stepless manner, instead of the above-described three-step control. Further, the absorption refrigeration apparatus to be controlled may be configured to perform only a cooling operation for cooling and sending out the brine, may be a single effect type, or may be configured to use, for example, steam by means other than fuel combustion. The structure which uses and heats may be sufficient. In addition, the specification temperature range, the control temperature range, the target temperature correction upper limit rate, the switching temperature correction upper limit rate, and the like can be changed as appropriate.

It is a block diagram which shows the control apparatus 1 of one Embodiment of this invention with the absorption-type cold / hot water machine. It is a block diagram which shows the structure for the high / low switching control operation | movement in the temperature control part 61 at the time of cold operation. It is a block diagram which shows the structure for the combustion execution in the temperature control part 61 at the time of cold operation, and a combustion stop switching control operation. It is a block diagram which shows the structure for calculating | requiring the target temperature correction amount Trs1 of the correction amount calculating part 75. FIG. It is a block diagram which shows the structure for calculating | requiring switching temperature correction amount Trs2 of the correction amount calculating part 75. FIG. It is a block diagram which shows the structure for the high / low switching control operation | movement in the temperature control part 61 at the time of warm operation. It is a block diagram which shows the structure for combustion execution and combustion stop control operation | movement in the temperature control part 61 at the time of warm operation. 6 is a flowchart showing a cold operation temperature control operation in the control means 55. 7 is a flowchart showing a warm operation temperature control operation in the control means 55. It is a graph which shows the simulation result of the cold operation temperature control operation | movement by the control means 55. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Absorption-type cold / hot water machine 50 Temperature detection means 51 Setting means 52 Control valve drive command means 53 Switching valve drive command means 54 Storage means 55 Control means 60 Cooling / heating switching part 61 Temperature control part 65 Heat supply control part 66 Correction part DESCRIPTION OF SYMBOLS 70 Deviation calculating part 71 Control calculating part 72 Switching comparison part 73 Control command part 75 Correction amount calculating part 76 Correction processing part 77 Load calculating part 78 Correction amount calculating part

Claims (8)

A control device for controlling an absorption refrigeration apparatus for adjusting the temperature of brine from an evaporator and feeding it by supplying heat to the solution with a regenerator,
Temperature detecting means for detecting the temperature of the brine sent from the evaporator;
Setting means for initially setting the target temperature of the brine temperature sent from the evaporator;
A control means having a heat supply control unit and a correction unit,
The heat supply control unit controls the supply heat flow rate in the regenerator so that the brine temperature approaches the target temperature based on the brine temperature detected by the temperature detection means and the target temperature.
When the proportion of the state where the supply heat flow rate in the regenerator is large is small, the correction unit is in a state where the brine temperature is within the specified temperature range based on the target temperature initially set by the setting means and the supply heat flow rate is large A control device for an absorption refrigeration apparatus, wherein the target temperature is corrected so that a ratio occupied by water becomes small. The absorption refrigeration system is an absorption chiller / heater used for air conditioning,
In the cooling operation state, the correction unit increases the target temperature when the ratio of the large supply heat flow rate in the regenerator is small, and the ratio of the large supply heat flow rate in the regenerator is small in the heating operation state. The control device for an absorption refrigeration apparatus according to claim 1, wherein the target temperature is corrected so as to lower the target temperature. A control device for controlling an absorption refrigeration apparatus for adjusting the temperature of brine from an evaporator and feeding it by supplying heat to the solution with a regenerator,
Temperature detecting means for detecting the temperature of the brine sent from the evaporator;
Setting means for initially setting the target temperature of the brine temperature sent from the evaporator;
Control means having a heat supply control and correction unit,
The heat supply control unit is configured so that the brine temperature approaches the target temperature based on the brine temperature detected by the temperature detection unit and the heat supply start temperature and the heat supply stop temperature set based on the target temperature. , Control heat supply execution and heat supply stop in the regenerator,
When the proportion of the heat supply execution state in the regenerator is small, the correction unit has a brine temperature that falls within the specification temperature range based on the target temperature initially set by the setting means, and the ratio of the heat supply execution state is A control device for an absorption refrigeration apparatus, wherein the heat supply start temperature and the heat supply stop temperature are corrected so as to decrease. The absorption refrigeration system is an absorption chiller / heater used for air conditioning,
The correction unit increases the heat supply start temperature and the heat supply stop temperature when the ratio of the heat supply execution state in the regenerator is small in the cooling operation state, and occupies the heat supply execution state in the regenerator in the heating operation state. The control device for an absorption refrigeration apparatus according to claim 3, wherein when the ratio is small, the heat supply start temperature and the heat supply stop temperature are corrected so as to lower the heat supply start temperature and the heat supply stop temperature. A control method for controlling an absorption refrigeration apparatus for adjusting the temperature of brine sent from an evaporator by supplying heat to a solution with a regenerator,
A temperature detection step of detecting the temperature of the brine sent from the evaporator;
When the proportion of the state where the supply heat flow rate in the regenerator is large is small, the temperature of the brine sent from the evaporator is within the specified temperature range based on the target temperature that is initially set, and the supply heat flow rate is large. An absorption refrigeration characterized by comprising a control step of correcting the target temperature so that the proportion occupied is small and controlling the flow rate of heat supplied to the regenerator so that the detected brine temperature approaches the target temperature Control method of the device. The absorption refrigeration system is an absorption chiller / heater used for air conditioning,
In the control process, in the cooling operation state, when the proportion of the state where the supply heat flow rate in the regenerator is large is small, the target temperature is increased, and in the heating operation state, the proportion of the state where the supply heat flow rate in the regenerator is large is small. The control method for an absorption refrigeration apparatus according to claim 5, wherein the target temperature is corrected so as to lower the target temperature. A control method for controlling an absorption refrigeration apparatus for adjusting the temperature of brine sent from an evaporator by supplying heat to a solution with a regenerator,
A temperature detection step of detecting the temperature of the brine sent from the evaporator;
When the proportion of the heat supply execution state in the regenerator is small, the proportion of the brine supplied from the absorption refrigeration apparatus falls within the specified temperature range based on the initial target temperature and the heat supply execution state The heat supply start temperature and the heat supply stop temperature are corrected so as to decrease, and the brine temperature is determined based on the detected brine temperature and the heat supply start temperature and the heat supply stop temperature set based on the target temperature. And a control process for controlling heat supply execution and heat supply stop in the regenerator so that the temperature of the regenerator approaches the target temperature. The absorption refrigeration system is an absorption chiller / heater used for air conditioning,
In the control process, in the cooling operation state, when the ratio of the heat supply execution state in the regenerator is small, the heat supply start temperature and the heat supply stop temperature are increased, and in the heating operation state, the heat supply execution state in the regenerator occupies 8. The method of controlling an absorption refrigeration apparatus according to claim 7, wherein when the ratio is small, the heat supply start temperature and the heat supply stop temperature are corrected so as to lower the heat supply start temperature and the heat supply stop temperature.

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