JP5902955B2 - Absorption type hot and cold water system - Google Patents

Description

  The present invention relates to an absorption-type cold / hot water system.

  2. Description of the Related Art Conventionally, an absorption chiller / hot water machine is known in which cold water is obtained by a circulation cycle of an evaporator, an absorber, a regenerator, and a condenser, and this cold water is supplied to an indoor unit and used for cooling. In the absorption chiller / heater, control is performed based on the chilled water temperature supplied to the indoor unit. That is, combustion is strengthened when the cold water temperature is increased, and combustion is weakened when the cold water temperature is lowered.

  In addition, in such an absorption chiller / heater, in order to heat the absorption liquid supplied to the regenerator, a renewable energy such as solar heat or exhaust heat is used as a heating source, and a combustor or the like is directly used. Some have a heating source for burning, and both of these absorption chiller-heaters may be used in combination.

  In order to obtain cooling capacity in an absorption chilled / hot water system in which both absorption chiller / heaters are combined, it is preferable to use exhaust heat or the like as much as possible. For this reason, when the cooling load is small, only the absorption chiller / heater using exhaust heat (hereinafter referred to as priority machine) is used. It is desirable to use a direct-fired machine.

  For this reason, in the conventional absorption-type cold / hot water system, it is supposed that a difference will be provided in both operation temperature. That is, the set-up machine keeps the set temperature higher than the priority machine. Thereby, even if the chilled water temperature becomes slightly high, only the priority machine is operated, and the direct-fired machine can be kept stopped (see Patent Document 1).

Japanese Patent Laid-Open No. 5-133737

  However, in the absorption chilled / hot water system described in Patent Document 1, if the set temperature of the direct watering machine is increased, slightly warm chilled water is supplied to the indoor unit when the load factor of the indoor unit is large, and the comfort deteriorates. Resulting in. Therefore, if the set temperature of the direct-operated machine is not increased, it will hinder the priority machine from being operated preferentially. The above problem is not limited to the cooling operation, but is a common problem during the heating operation.

  The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to increase the load factor while operating a priority machine using exhaust heat more preferentially. An object of the present invention is to provide an absorption-type cold / hot water system capable of preventing deterioration of comfort in the case of becoming.

The absorption chilled / hot water system of the present invention uses at least one of exhaust heat and renewable energy as a heating source, and gives priority to obtaining chilled water used in indoor units by a circulation cycle using an evaporator, an absorber, a regenerator, and a condenser. A direct-fired machine that uses the heat generated by burning fossil fuel as a heating source and obtains cold water used in the indoor unit by a circulation cycle by an evaporator, an absorber, a regenerator, and a condenser, The load factor calculation means for calculating the load factor of the indoor unit based on the information from the direct winder, and the set temperature of the priority machine in the cooling operation is set to be equal to or lower than the set temperature of the direct winder and is calculated by the load factor calculation means. As the load factor increases, the cooling control function that reduces the difference between the set temperature of the priority machine and the direct-fired machine, and the set temperature of the priority machine in the heating operation is set to be equal to or higher than the set temperature of the direct-fired machine, According the calculated load ratio becomes higher the load rate calculating means, and a temperature control means having at least one of a heating control function to reduce the difference between the set temperature of the priority machine and straight-fired equipment, temperature control means, If the air conditioner has a cooling control function, the set temperature of the priority machine is set lower than when the direct air machine is stopped during combustion of the direct air machine, and if the heating control function is provided, the direct air machine is stopped during combustion of the direct air machine. It is characterized in that the set temperature of the priority machine is set higher than the inside .

According to this absorption-type cold / hot water system, since the set temperature of the priority machine is set to be equal to or lower than the set temperature of the direct winder in the cooling operation, the priority machine operates with priority over the direct winder. Further, since the set temperature of the priority machine is set to be equal to or higher than the set temperature of the direct-fired machine in the heating operation, the priority machine is operated with priority over the direct-fired machine. In addition, as the load factor increases, the difference between the set temperatures of the priority machine and the direct-fired machine is reduced. Therefore, when the load factor is small, the set temperature difference between the two becomes large and only the priority machine can be operated easily. When the load factor is large, it is easy to supply appropriate cold water to the indoor unit by operating the priority machine and the direct-fired machine at a close temperature (including the same temperature). Therefore, when the load factor is small, exhaust heat or the like can be used effectively, and when the load factor is large, appropriate cold water is supplied to the indoor unit, so that comfort can be maintained. Therefore, it is possible to prevent the deterioration of the comfort when the load factor is increased while operating the priority machine using exhaust heat or the like more preferentially. Furthermore, when it has a cooling control function, the set temperature of the priority machine is made lower during combustion of the direct-fired machine than when the direct-fired machine is stopped. Moreover, when it has a heating control function, the set temperature of a priority machine is made higher during combustion of a direct-fired machine than when the direct-fired machine is stopped. For this reason, the priority machine using exhaust heat etc. can be operated more preferentially in the situation where both absorption type cold / hot water machines operate.

  Further, in this absorption-type cold / hot water system, when the temperature control means has a cooling control function, the heating control function increases the set temperature of the direct winder as the load factor calculated by the load factor calculation means decreases. When the load factor calculated by the load factor calculating means is lowered, it is preferable to lower the set temperature of the direct winder.

  According to this absorption-type cold / hot water system, when the cooling control function is provided, the set temperature of the direct winder is increased as the load factor decreases, and when the heating control function is provided, the direct heating machine is increased as the load factor decreases. Therefore, the priority machine using exhaust heat or the like can be efficiently operated.

  Moreover, in this absorption-type cold / hot water system, it is preferable that a temperature control means sets the preset temperature of a priority machine to the predetermined standard temperature while a direct-fired machine is stopped.

  According to this absorption-type cold / hot water system, in order to set the preset temperature of the priority machine to a predetermined standard temperature while the direct-fired machine is stopped, the priority machine is operated in an efficient state while the direct-fired machine is stopped. be able to.

  In this absorption chilled / warm water system, it is preferable that a remote operation panel capable of switching at least cooling and heating is further provided, and the remote operation panel includes a load factor calculation unit and a temperature control unit.

  According to this absorption-type cold / hot water system, at least a remote control panel capable of switching between air conditioning and heating is further provided, and the remote control panel includes load factor calculation means and temperature control means. By incorporating programs corresponding to the rate calculation means and the temperature control means, the above system can be realized, and an increase in configuration can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the absorption type | formula cold / hot water system which can prevent the deterioration of the comfort in the case where a load factor becomes large is provided, operating a priority machine using exhaust heat etc. more preferentially. be able to.

It is a block diagram which shows the absorption-type cold / hot water system which concerns on this embodiment. It is a block diagram which shows an example of the basic composition of the absorption-type cold / hot water machine used as the priority machine which concerns on this embodiment. It is a block diagram which shows an example of the basic composition of the absorption type cold / hot water machine used as the direct watering machine which concerns on this embodiment. It is a figure which shows the mode of control of the priority machine shown in FIG. It is a chart which shows the control temperature of the priority machine and direct-handed machine which concern on this embodiment. It is a graph which shows the driving | running state of the priority machine which concerns on the comparative example 1, and a direct-handed machine, and has shown the example when a load factor is 20%. It is a graph which shows the driving | running state of the priority machine which concerns on the comparative example 1, and a direct-handed machine, and has shown the example when a load factor is 80%. It is a graph which shows the driving | running state of the priority machine which concerns on the comparative example 2, and a direct-handed machine, and has shown the example when a load factor is 20%. It is a graph which shows the driving | running state of the priority machine which concerns on the comparative example 2, and a direct-handed machine, and has shown the example when a load factor is 80%. It is a graph which shows the driving | running state of the priority machine which concerns on this embodiment, and a direct-handed machine, and has shown the example when a load factor is 80%.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. In the following description, the cooling operation will be described as an example, but the present invention is not limited to the cooling operation but can be applied to the heating operation.

  FIG. 1 is a block diagram showing an absorption-type cold / hot water system 1 according to the present embodiment. As shown in FIG. 1, the absorption chilled / hot water system 1 includes a priority machine 2, a direct-fired machine 3, and a remote control panel 6, and cool water from the priority machine 2 and the direct-fired machine 3 is supplied to the indoor unit 5. To supply. The indoor unit 5 uses the supplied cold water to obtain a cooling effect.

  In such an absorption-type cold / hot water system 1, the cold water output from the priority machine 2 and the direct-fired machine 3 is mixed and supplied to the indoor unit 5. In the indoor unit 5, cold water is used for cooling to raise the temperature, and the raised cold water is supplied again to the priority unit 2 and the direct-fired unit 3 to be cooled. Thereafter, the cold water circulates through the indoor unit 5, the priority unit 2, and the direct hitting unit 3.

  FIG. 2 is a configuration diagram illustrating an example of a basic configuration of an absorption chiller / heater serving as the priority machine 2 according to the present embodiment. In this embodiment, a so-called double-effect absorption chiller / heater is described as an example. However, the present invention is not limited to this, and the priority machine 2 may be a single-effect or triple-effect absorption chiller / heater. .

  As shown in FIG. 2, the priority machine 2 includes a high temperature regenerator 10, a separator 12, a low temperature regenerator 14, a condenser 16, an evaporator 18, an absorber 20, a solution circulation pump 22, a high temperature and low temperature solution heat exchanger. 24 and 26 are provided, and an absorption refrigeration cycle is configured by connecting these pipes. Further, as shown in FIG. 2, the priority machine 2 is provided with a control device 4 a that controls the entire priority machine 2.

  The high-temperature regenerator 10 includes, for example, water serving as a refrigerant (hereinafter, the refrigerant vaporized is referred to as refrigerant vapor, and the refrigerant liquefied is referred to as liquid refrigerant), lithium bromide (LiBr) serving as an absorption liquid, Is used to heat a dilute solution (solution having a low concentration of the absorbing solution). The high temperature regenerator 10 is provided with a heating device 10a. The heating device 10a is configured to heat the dilute solution with renewable energy such as exhaust heat or solar heat. Further, the high temperature regenerator 10 generates refrigerant vapor and an intermediate concentrated solution (a solution having a medium concentration of absorbing liquid) by heating the diluted solution and releasing the vapor from the diluted solution. The high temperature regenerator 10 supplies the refrigerant vapor and the intermediate concentrated solution to the separator 12.

  The separator 12 separates the refrigerant vapor and the intermediate concentrated solution. The separator 12 supplies the separated intermediate concentrated solution to the high temperature solution heat exchanger 24 and supplies the separated refrigerant vapor to the low temperature regenerator 14.

  The high-temperature solution heat exchanger 24 exchanges heat between the intermediate concentrated solution supplied from the separator 12 and the dilute solution sent from the absorber 20 by the solution circulation pump 22. Further, the high temperature solution heat exchanger 24 supplies the low temperature regenerator 14 with the intermediate concentrated solution whose temperature has decreased due to heat exchange.

  The low-temperature regenerator 14 exchanges heat between the intermediate concentrated solution whose temperature has decreased due to heat exchange and the refrigerant vapor supplied from the separator 12. In this low-temperature regenerator 14, the intermediate concentrated solution is reheated, and vapor is again discharged to become a concentrated solution having a high concentration. The low temperature regenerator 14 supplies the concentrated solution to the low temperature solution heat exchanger 26 and supplies the refrigerant vapor to the condenser 16.

  The condenser 16 liquefies the refrigerant vapor supplied from the low temperature regenerator 14. A cold water heat transfer tube 16 a is inserted into the condenser 16. Cooling water is supplied to the cold water heat transfer tube 16a, and the evaporated refrigerant vapor is liquefied by the cooling water in the cold water heat transfer tube 16a. Furthermore, the condenser 16 has a liquid refrigerant storage chamber 16b, and the liquefied refrigerant is stored in the liquid refrigerant storage chamber 16b. Further, the liquid refrigerant storage chamber 16 b supplies the stored liquid refrigerant to the evaporator 18.

  The evaporator 18 evaporates the liquid refrigerant. In the evaporator 18, a liquid refrigerant distributor 18a and a cold water heat transfer tube 18b are provided. The liquid refrigerant distributor 18a introduces the liquid refrigerant supplied from the liquid refrigerant storage chamber 16b and spreads the liquid refrigerant toward the cold water heat transfer pipe 18b.

  The cold water heat transfer pipe 18b is connected to the indoor unit, and water warmed by cooling by the indoor unit flows. Further, the inside of the evaporator 18 is in a vacuum state. For this reason, the evaporating temperature of the water which is a refrigerant | coolant will be about 5 degreeC. Therefore, the liquid refrigerant that has fallen on the cold water heat transfer tube 18b evaporates depending on the temperature of the cold water heat transfer tube 18b. Further, the temperature of the water in the cold water heat transfer tube 18b is deprived of the temperature by the evaporation of the liquid refrigerant. Thereby, the water in the cold water heat transfer tube 18b is supplied to the indoor unit 5 as cold water, and the indoor unit 5 supplies cold air to the room using the cold water.

  Further, the evaporator 18 is provided adjacent to the absorber 20 through a partition, and the evaporated refrigerant is supplied to the absorber 20 through the partition.

  The low-temperature solution heat exchanger 26 exchanges heat between the concentrated solution warmed in the low-temperature regenerator 14 and the dilute solution sent from the absorber 20 by the solution circulation pump 22. The low temperature solution heat exchanger 26 supplies the absorber 20 with a concentrated solution whose temperature has decreased due to heat exchange.

  The absorber 20 absorbs the refrigerant evaporated in the evaporator 18. A concentrated solution is supplied into the absorber 20 from the low-temperature solution heat exchanger 26, and the evaporated refrigerant is absorbed by the concentrated solution to generate a diluted solution. The absorber 20 is inserted with a cold water heat transfer tube 20a. Cooling water flows through the cold water heat transfer tube 20a, and absorbed heat is removed by the cooling water of the cold water heat transfer tube 20a due to absorption of the refrigerant of the concentrated solution. The cold water heat transfer tube 20a is connected to the cold water heat transfer tube 16a.

  Further, the absorber 20 supplies the dilute solution whose concentration is reduced by the absorption of the refrigerant to the high temperature regenerator 10 by the solution circulation pump 22. As described above, the dilute solution is supplied to the high-temperature regenerator 10 in a state where the temperature is increased by heat exchange by the high-temperature and low-temperature solution heat exchangers 24 and 26.

  Further, the priority machine 2 includes a temperature sensor 28. The temperature sensor 28 detects the cold water temperature on the outlet side of the cold water heat transfer tube 18b (that is, the side supplied to the indoor unit 5). The temperature sensor 28 is configured to transmit the detected cold water temperature to the control device 4a.

  FIG. 3 is a configuration diagram showing an example of a basic configuration of an absorption chiller / heater serving as the direct watering machine 3 according to the present embodiment. In this embodiment, a so-called double-effect absorption chiller / heater is described as an example. However, the present invention is not limited to this, and the direct-fired machine 3 may be a single-effect or triple-effect absorption chiller / heater. Good. 3 that are denoted by the same reference numerals as those shown in FIG. 2 are the same as those shown in FIG.

  As shown in FIG. 3, the direct-fired machine 3 includes a high-temperature regenerator 10 and a combustion device 10b. The combustion device 10b is configured to heat a dilute solution by burning fossil fuel such as gas. Further, as shown in FIG. 3, the direct winding machine 3 is provided with a control device 4 b that controls the entire direct winding machine 3.

  Further, the control devices 4a and 4b shown in FIGS. 2 and 3 control the heating device 10a and the combustion device 10b based on the cold water temperature on the outlet side of the cold water heat transfer tube 18b in more detail. Specifically, the control devices 4a and 4b control the operation of the priority machine 2 and the direct heating machine 3 as follows based on the cold water temperature on the outlet side of the cold water heat transfer pipe 18b detected by the temperature sensor 28.

  FIG. 4 is a diagram showing a state of control of the priority machine 2 and the direct handing machine 3 shown in FIG. As shown in FIG. 4, it is first assumed that the operations of the priority machine 2 and the direct-handed machine 3 are stopped (off). When the temperature of the cold water detected by the temperature sensor 28 reaches T1, which is the first temperature, the control devices 4a and 4b start the operation of the priority machine 2 and the direct handing machine 3 (Low operation). Here, the control devices 4a and 4b start the operation of the priority machine 2 and the direct hitting machine 3 in the low load mode. The low load mode is an operation mode when the cooling load is about 50%.

  In addition, when the cold water temperature detected by the temperature sensor 28 in the low load mode reaches the second temperature T2, the control devices 4a and 4b stop the operation of the priority machine 2 and the direct handing machine 3 (off). On the other hand, when the cold water temperature detected by the temperature sensor 28 in the low load mode reaches the third temperature T3, the control devices 4a and 4b shift the operation mode to the high load mode (Hi operation). Here, the high load mode is an operation mode that is started when the magnitude of the cooling load is about 100%.

  Further, when the cold water temperature detected by the temperature sensor 28 in the high load mode decreases to T4, which is the fourth temperature, the control devices 4a and 4b cause the priority machine 2 and the direct-fired machine 3 to perform a low operation in the high load mode ( Low operation). Further, in this state, when the chilled water temperature detected by the temperature sensor 28 rises to T5 which is the fifth temperature, the control devices 4a and 4b cause the priority machine 2 and the direct winder 3 to perform the Hi operation while maintaining the high load mode ( Hi operation). In addition, when the cold water temperature detected by the temperature sensor 28 in the low load operation in the high load mode decreases to the seventh temperature T7, the control devices 4a and 4b stop the operation of the priority machine 2 and the direct handing machine 3 (off).

  In addition, the control devices 4a and 4b according to the present embodiment control the operation of the priority machine 2 and the direct-handed machine 3 by performing time integration. That is, it is assumed that the cold water temperature detected by the temperature sensor 28 in the low operation in the low load mode is within the range of the first temperature T1 to the sixth temperature T6. At this time, the control devices 4a and 4b integrate the chilled water temperature over time, and when the time integrated value reaches the first predetermined value, the operation mode is switched to the high load mode (Hi operation). The control devices 4a and 4b integrate the value obtained by (cold water temperature−first temperature T1 ° C.) over time, but are not limited to the first temperature T1 ° C. May be.

  Similarly, it is assumed that the cold water temperature detected by the temperature sensor 28 in the low operation in the high load mode is within the range of the seventh temperature T7 to the second temperature T2. At this time, the control devices 4a and 4b integrate the time of the chilled water temperature and stop the operation when the time-integrated value reaches the second predetermined value (off). The control devices 4a and 4b integrate the values obtained by (cold water temperature−second temperature T2 ° C.) over time, but are not limited to the second temperature T2 ° C., but may be other temperatures. May be.

  As described above, the control devices 4a and 4b control the priority machine 2 and the direct handing machine 3. Here, when the set temperature is the standard temperature (specifically, for example, the outlet chilled water temperature in rated operation and 7 ° C. in the present embodiment), the priority machine 2 and the direct-fired machine 3 have the first temperature T1. 10 ° C. (standard temperature + 3 ° C.), and the second temperature T2 is 7 ° C. (standard temperature). The third temperature T3 is 15 ° C. (standard temperature + 8 ° C.), the fourth temperature T4 is 6.5 ° C. (standard temperature−0.5 ° C.), and the fifth temperature T5 is 10.5 ° C. (standard). Temperature + 3.5 ° C.). Further, the sixth temperature T6 is 12 ° C. (standard temperature + 5 ° C.), and the seventh temperature T7 is 5 ° C. (standard temperature-2 ° C.). In the following description, the standard temperature is assumed to be 7 ° C., but the standard temperature is not particularly limited to 7 ° C.

  Reference is again made to FIG. The remote control panel 6 includes a load factor calculation unit (load factor calculation means) 6a and a temperature control unit (temperature control means) 6b. The load factor calculation unit 6 a calculates (estimates) the load factor of the indoor unit 5 based on information from the priority machine 2 and the direct-handed machine 3. Specifically, the load factor calculation unit 6a estimates the load factor based on the detected combustion amounts of the priority machine 2 and the direct-fired machine 3. The temperature control unit 6b controls the set temperatures of the priority machine 2 and the direct handing machine 3 based on the load factor calculated (estimated) by the load factor calculation unit 6a. At this time, the temperature control unit 6b generates the load factor information calculated by the load factor calculation unit 6a and the operation / stop command signals of the priority machine 2 and the direct-handed machine 3 and transmits them to the control devices 4a and 4b. To do. Based on the transmitted signals, the control devices 4a and 4b control the set temperature of the priority machine 2 and the set temperature of the direct handing machine 3 according to the chart shown in FIG.

  FIG. 5 is a chart showing the control temperatures of the priority machine 2 and the direct handing machine 3 according to the present embodiment. Specifically, as shown in FIG. 5, when the load factor of the indoor unit 5 is 1% to 20%, the direct handing machine 3 sets the set temperature to the standard temperature + t1 ° C. (for example, 2 ° C.). That is, the set temperature of the direct winding machine 3 is 9 ° C. In this case, the first temperature T1 shown in FIG. 4 is offset by + 2 ° C. to 12 ° C., and the second temperature T2 is also offset to 9 ° C. Similarly, the temperatures T3 to T7 are also offset, the third temperature T3 is 17 ° C., the fourth temperature T4 is 8.5 ° C., and the fifth temperature T5 is 12.5 ° C. Further, the sixth temperature T6 is 14 ° C., and the seventh temperature T7 is 7 ° C.

  On the other hand, as shown in FIG. 5, when the load factor of the indoor unit 5 is 1% to 20% and the direct-fired unit 3 is stopped in combustion, the priority unit 2 has a set temperature equal to the standard temperature. Is done. Accordingly, the first temperature T1 is 10 ° C., and the second temperature T2 is 7 ° C. The third temperature T3 is 15 ° C., the fourth temperature T4 is 6.5 ° C., and the fifth temperature T5 is 10.5 ° C. Furthermore, the sixth temperature T6 is 12 ° C., and the seventh temperature T7 is 5 ° C.

  As shown in FIG. 5, when the load factor of the indoor unit 5 is 1% to 20% and the direct-fired unit 3 is in combustion, the priority unit 2 has a set temperature of the standard temperature −t2 ° C. (for example, 1 ° C.). Accordingly, the first temperature T1 is 9 ° C., and the second temperature T2 is 6 ° C. The third temperature T3 is 14 ° C., the fourth temperature T4 is 5.5 ° C., and the fifth temperature T5 is 9.5 ° C. Furthermore, the sixth temperature T6 is 11 ° C., and the seventh temperature T7 is 4 ° C.

  More specifically, when the load factor is 21% to 40%, the direct winding machine 3 has a set temperature of standard temperature + t1 ° C., and a load factor of 41% to 60%. When the standard temperature + t3 ° C. (t3 is a number smaller than t1 and is, for example, 1 ° C.) and the load factor is 61% to 80%, the set temperature is the standard temperature and the load factor is 81% to 100 In the case of%, the set temperature becomes the standard temperature.

  On the other hand, as with the case where the load factor is 1% to 20%, the priority machine 2 has the set temperature when the direct-fired machine 3 is in the combustion stop state even if the load factor is 21% or more. Is the standard temperature, and when the direct-fired machine 3 is in combustion, the set temperature is the standard temperature −t2 ° C.

  As described above, the temperature control unit 6b sets the set temperature of the priority machine 2 to be equal to or lower than the set temperature of the direct hoisting machine 3 and increases the load factor calculated by the load factor calculation unit 6a. The difference in the set temperature of the whirling machine 3 is reduced. Then, by setting the set temperature of the priority machine 2 to be equal to or lower than the set temperature of the direct handing machine 3, the priority machine 2 is preferentially operated over the direct handing machine 3.

  In addition, as the load factor increases, the difference between the set temperatures of the priority machine 2 and the direct-fired machine 3 is reduced. Therefore, when the load factor is small, the set temperature difference between the two increases and only the priority machine 2 operates. However, when the load factor is large, the priority machine 2 and the direct-fired machine 3 are operated at close temperatures so that appropriate cold water can be easily supplied to the indoor unit 5. Therefore, when the load factor is small, exhaust heat or the like can be used effectively, and when the load factor is large, appropriate cold water is supplied to the indoor unit 5 so that comfort can be maintained.

  More specifically, as shown in FIG. 5, the temperature control unit 6 b increases the set temperature of the direct-operated machine 3 as the load factor calculated by the load factor calculation unit 6 a decreases. For this reason, the priority machine 2 using exhaust heat or the like can be operated efficiently. That is, as the load factor decreases, it is conceivable to lower the set temperature of the priority machine 2 and increase the set temperature difference. In this case, however, the priority machine 2 cannot effectively operate and is effective. It's not driving.

  As is clear from FIG. 5, the temperature control unit 6 b lowers the set temperature of the priority machine 2 during combustion of the direct-fired machine 3 than when the direct-fired machine 3 is stopped. Thereby, even in the situation where both the priority machine 2 and the direct-handed machine 3 are operated, the priority machine 2 using exhaust heat or the like can be operated more preferentially.

  Furthermore, the temperature controller 6b sets the set temperature of the priority machine 2 to a predetermined standard temperature while the direct-handed machine 3 is stopped. Thereby, the priority machine 2 can be operated in an efficient state while the direct-powered machine 3 is stopped.

  Note that the content shown in FIG. 5 is merely an example, and can be changed as appropriate without departing from the spirit of the present invention. That is, the division of the load factor and the set temperature can be changed as appropriate without departing from the spirit of the present invention.

  Next, the operation (simple simulation result) of the absorption chilled / hot water system 1 according to the present embodiment will be described. Prior to this, the operation (simple simulation result) of the absorption chilled / hot water system as a comparative example will be described. Note that the simulation results shown below vary depending on the ambient temperature environment and the like, and when the ambient temperature environment and the like change, the temperature and the like differ somewhat depending on the change.

  First, in the absorption-type cold / hot water system which becomes the comparative example 1, the priority machine and the direct-fired machine were controlled as follows. In the comparative example 1, the priority machine and the direct-fired machine are controlled so that the temperature of the cold water supplied to the indoor unit is 7 ° C. That is, both the priority machine and the direct-handed machine set the standard temperature of 7 ° C., and no difference is set in the set temperature.

  FIG. 6 is a graph showing operating states of the priority machine and the direct-fired machine according to Comparative Example 1, and shows an example when the load factor is 20%. As shown in FIG. 6, first, it is assumed that the cold water outlet temperature (the temperature of the cold water supplied to the indoor unit) is 13 ° C., and both the priority machine and the direct-fired machine are operating in the high load mode.

  Then, when the time reaches a little less than about 4 minutes, the chilled water outlet temperature decreases to reach 6.5 ° C., which is the fourth temperature T4. For this reason, both a priority machine and a direct-handed machine become Low operation of high load mode. Thereafter, the temperature of the cold water outlet decreases, and when the time becomes slightly over 4 minutes, the seventh temperature T7, which is 5 ° C., is reached, so both the priority machine and the direct-fired machine stop operating. Thereafter, the cold water outlet temperature rises because both the priority machine and the direct-fired machine have stopped operating.

  Then, when the chilled water outlet temperature rises and when the chilled water outlet temperature reaches 10 ° C., which is the first temperature T1, at about 13 minutes, both the priority machine and the direct-fired machine start Low operation in the low load mode. Further, since both the priority machine and the direct-fired machine start the Low operation in the low load mode, the chilled water outlet temperature starts to decrease at about 15 minutes.

  Next, when the time reaches approximately 18 minutes, the cold water outlet temperature reaches 7 ° C., which is the second temperature T2, and both the priority machine and the direct-fired machine stop operation. Thereafter, both the priority machine and the direct-handed machine repeat the start and stop of the operation in the low load mode. In addition, cold water inlet temperature (temperature of the cold water supplied from an indoor unit) will change in a state always higher than cold water outlet temperature.

  Thus, if the setting temperature of the priority machine and the direct-handed machine is the same, the priority machine and the direct-handed machine start and stop simultaneously, and the priority machine cannot be preferentially operated.

  FIG. 7 is a graph showing operating states of the priority machine and the direct-fired machine according to Comparative Example 1, and shows an example when the load factor is 80%. As shown in FIG. 7, first, it is assumed that the cold water outlet temperature is 13 ° C., and both the priority machine and the direct-fired machine are performing the Hi operation in the high load mode. In particular, in the example shown in FIG. 7, since the load factor of the indoor unit is high, the chilled water inlet temperature rises after time 0 min.

  And when the time reaches a little less than about 4 minutes, both the priority machine and the direct-fired machine are operating in Hi mode in the high load mode, so the chilled water inlet temperature decreases and the chilled water outlet temperature also decreases. Go. Next, when the time becomes slightly over 10 minutes, the chilled water outlet temperature decreases and reaches the fourth temperature T4, which is 6.5 ° C., so that both the priority machine and the direct-fired machine are in the low operation of the high load mode.

  When the chilled water outlet temperature rises and when the chilled water outlet temperature reaches 10.5 ° C., which is the fifth temperature T5, at about 14 minutes, both the priority machine and the direct-fired machine perform Hi operation in the high load mode. Start. Thereby, cold water exit temperature will fall.

  Next, when the time reaches 20 minutes, the cold water outlet temperature reaches 6.5 ° C., which is the fourth temperature T4, so that both the priority machine and the direct-fired machine are in the low operation in the high load mode. Thereafter, both the priority machine and the direct-handed machine repeat the Hi operation and the Low operation in the high load mode. Note that the cold water inlet temperature is constantly higher than the cold water outlet temperature.

  As described above, even when the load factor of the indoor unit is high, if the set temperature of the priority unit and the direct operation unit is the same, the priority unit and the direct operation unit simultaneously switch the Hi operation and the Low operation, The priority aircraft cannot be operated with priority.

  Therefore, in order to preferentially operate the priority machine, the set temperature of the priority machine is set lower than the set temperature of the direct operation machine.

  FIG. 8 is a graph showing operating states of the priority machine and the direct-fired machine according to Comparative Example 2, and shows an example when the load factor is 20%. In Comparative Example 2, the set temperature of the priority machine is the standard temperature-1 ° C. (6 ° C.), the set temperature of the direct-fired machine is the standard temperature + 2 ° C. (9 ° C.), and there is a difference of 3 ° C. in the set temperature. ing.

  As shown in FIG. 8, first, it is assumed that the cold water outlet temperature is 13 ° C., and both the priority machine and the direct-fired machine are operating in high load mode. Then, when the time reaches about 3 min, the cold water outlet temperature of the direct watering machine decreases to reach the fourth temperature T4 of 8.5 ° C. For this reason, the direct-operated machine becomes a low operation in a high load mode. Further, the temperature of the cold water outlet decreases thereafter, and when the time reaches about 4 min, the seventh temperature T7, which is 7 ° C., is reached. Thereafter, the direct watering machine does not reach the 12 ° C. which is the first temperature T1, and the operation is stopped.

  On the other hand, since the chilled water outlet temperature reaches 5.5 ° C., which is the fourth temperature T4, at the time of about 4 minutes, the priority machine is in the high load mode Low operation. Thereafter, the priority machine does not reach the cold water outlet temperature of 9.5 ° C., which is the fifth temperature T5, and continues the low operation.

  As described above, as shown in FIG. 8, by setting the set temperature of the priority machine to be equal to or lower than the set temperature of the direct machine, the priority machine performs the Low operation in a state where the direct machine is stopped. Can be preferentially driven. Therefore, exhaust heat etc. can be used efficiently and fuel consumption can be suppressed. However, the example shown in FIG. 8 is at a low load with a load factor of about 20%, and there is a problem with the comfort of cooling at a high load.

  FIG. 9 is a graph showing the operating state of the priority machine and the direct-fired machine according to Comparative Example 2, and shows an example when the load factor is 80%. As shown in FIG. 9, first, it is assumed that the cold water outlet temperature is 13 ° C., and both the priority machine and the direct-fired machine are operating in the high load mode. In particular, in the example shown in FIG. 9, since the load factor of the indoor unit is high, the chilled water inlet temperature rises after time 0 min.

  And when the time reaches about 4 min, both the priority machine and the direct-fired machine are operating in the high load mode, so the cold water inlet temperature is lowered and the cold water outlet temperature is also lowered. . Next, when the time becomes slightly less than 8 minutes, the cold water outlet temperature of the direct watering machine decreases to reach the fourth temperature T4 of 8.5 ° C. For this reason, the direct-operated machine becomes a low operation in a high load mode. Thereby, when the temperature of the chilled water outlet of the direct watering machine rises and the time becomes less than about 22 minutes, the temperature of the chilled water outlet of the direct watering machine reaches 12.5 ° C., which is the fifth temperature T5. For this reason, the direct-powered machine shifts to the high load mode Hi operation. Thereafter, the direct winding machine repeats the Hi operation and the Low operation in the high load mode.

  On the other hand, the chilled water outlet temperature of the priority machine repeatedly rises and falls according to Low operation and Hi operation of the direct-fired machine, but does not reach 5.5 ° C., which is the fourth temperature T4. Continue to maintain Hi operation.

  In this way, when the load is high, the priority machine continues to perform the Hi operation, whereas the direct-fired machine repeats the Hi operation and the Low operation, so there is no problem from the viewpoint of operating the priority machine with priority. However, as is clear from FIG. 9, the maximum temperature of the cold water outlet temperature (mixing) at the time of high load is 11.2 ° C., and the average temperature is 9.8 ° C. In the case of Comparative Example 1, as shown in FIG. 7, the maximum temperature of the cold water outlet temperature (mixing) at the time of high load is 10.5 ° C. and the average temperature is 8.6 ° C. Therefore, if the difference between the set temperature of the priority machine and the set temperature of the direct-fired machine is too large, it will not be possible to supply sufficiently cooled chilled water to the indoor unit, reducing the cooling performance of the indoor unit and causing problems in terms of comfort. There is.

  Therefore, in the present embodiment, the set temperature is changed according to the load factor of the indoor unit 5 as shown in FIG. Specifically, when the load factor is 1% to 40%, the setting temperature of the priority machine is set to the standard temperature -1 ° C (6 ° C), and the setting temperature of the direct-fired machine is set to the standard temperature + 2 ° C (9 ° C). A temperature difference of 3 ° C is provided. Thereby, as shown in FIG. 8, the priority machine 2 is operated preferentially.

  On the other hand, when the load is high (load factor of 60% or more), the set temperature of the priority machine is the standard temperature -1 ° C (6 ° C), the set temperature of the direct-fired machine is the standard temperature (7 ° C), and the set temperature is 1 Only provide a temperature of ℃. Thereby, it is supposed to maintain comfort. At medium load (load factor 41-60%), the set temperature of the priority machine is set to the standard temperature -1 ° C (6 ° C), and the set temperature of the direct-fired machine is set to the standard temperature + 1 ° C (8 ° C). A temperature difference of 2 ° C is provided.

  FIG. 10 is a graph showing operating states of the priority machine 2 and the direct-handed machine 3 according to the present embodiment, and shows an example when the load factor is 80%.

  As shown in FIG. 10, first, it is assumed that the cold water outlet temperature is 13 ° C., and both the priority machine 2 and the direct handing machine 3 are operating in the high load mode. Moreover, since the load factor of the indoor unit 5 is high, the cold water inlet temperature rises after time 0 min.

  When the time reaches about 4 minutes, both the priority machine 2 and the direct-fired machine 3 are operating in the high load mode, so the cold water inlet temperature is lowered and the cold water outlet temperature is also lowered. To go. Next, when the time reaches about 10 min, the temperature of the cold water outlet of the direct watering machine 3 decreases and reaches the fourth temperature T4 of 6.5 ° C. For this reason, the direct winding machine 3 becomes Low operation of a high load mode. Thereby, the chilled water outlet temperature of the direct watering machine 3 rises, and when the time reaches about 18 minutes, the chilled water outlet temperature of the direct watering machine 3 reaches 10.5 ° C., which is the fifth temperature T5. For this reason, the direct winding machine 3 shifts to the high load mode Hi operation. Thereafter, the direct handing machine 3 repeats the Hi operation and the Low operation in the high load mode.

  On the other hand, the cold water outlet temperature of the priority machine 2 repeatedly rises and falls according to Low operation and Hi operation of the direct-fired machine, but does not reach 5.5 ° C., which is the fourth temperature T4. Continue to maintain the Hi operation.

  Here, as is clear from FIG. 10, the maximum temperature of the cold water outlet temperature (mixing) at the time of high load is 9.1 ° C. and the average temperature is 7.9 ° C. For this reason, it is lower than the maximum temperature and the average temperature shown in Comparative Example 2. Therefore, in this embodiment, the cold water cooled rather than the comparative example 2 can be supplied to the indoor unit 5, and it can be said that it is improved in terms of comfort.

  In this way, in the absorption chilled water system 1 according to the present embodiment, since the set temperature of the priority machine 2 is equal to or lower than the set temperature of the direct winder 3, the priority machine 2 has priority over the direct firer 3. You will drive. In addition, as the load factor increases, the difference between the set temperatures of the priority machine 2 and the direct-fired machine 3 is reduced. Therefore, when the load factor is small, the set temperature difference between the two increases and only the priority machine 2 operates. In addition, when the load factor is large, the priority machine 2 and the direct-fired machine 3 are operated at a temperature close to each other and appropriate cold water can be easily supplied to the indoor unit 5. Therefore, when the load factor is small, exhaust heat or the like can be used effectively, and when the load factor is large, appropriate cold water is supplied to the indoor unit 5 so that comfort can be maintained. Accordingly, it is possible to prevent the deterioration of the comfort when the load factor increases while operating the priority machine 2 using exhaust heat or the like more preferentially.

  Further, since the set temperature of the direct-powered machine 3 is increased as the load factor decreases, the direct-fired machine 3 becomes difficult to operate, and the priority machine using exhaust heat or the like can be operated effectively.

  Further, the set temperature of the priority machine 2 is set lower during combustion of the direct-fired machine 3 than when the direct-fired machine 3 is stopped. For this reason, in the situation where both the priority machine 2 and the direct-handed machine 3 are operated, the priority machine 2 can be operated more easily, and the priority machine using exhaust heat or the like can be operated more preferentially.

  Further, since the set temperature of the priority machine 2 is set to a predetermined standard temperature while the direct-powered machine 3 is stopped, the priority machine 2 can be operated in an efficient state.

  Further, since the remote control panel further includes at least a remote control panel 6 capable of switching between air conditioning and heating, and the remote control panel includes a load factor calculation unit 6a and a temperature control unit 6b, the load factor calculation unit 6a and the CPU in the remote control panel are provided. By incorporating a program corresponding to the temperature control unit 6b, the above system can be realized, and an increase in configuration can be suppressed.

  As described above, the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment, and may be modified without departing from the gist of the present invention. For example, in the absorption cold / hot water system 1 which concerns on this embodiment, about various structures etc., it is not restricted to what was illustrated. Further, the specifically described temperatures are not limited to those described above.

  Furthermore, in the present embodiment, the number of direct-handed machines 3 is one. In addition, a plurality of priority machines 2 may be provided.

  In the above description, the cooling operation has been described as an example, but the present invention is also applicable to the heating operation. Here, when heating operation is performed, a switching valve (not shown) is switched. When the switching valve is switched, warm water flows through the cold water heat transfer pipe 18b, and a heating effect is obtained based on the warm water in the indoor unit 5, and the water cooled by the heating is reused by the priority machine 2 and the direct fired machine. 3 will be supplied. Moreover, about each temperature mentioned above, high and low are reversed and controlled.

DESCRIPTION OF SYMBOLS 1 ... Absorption type cold / hot water system 2 ... Priority machine 3 ... Direct-fired machine 4a, 4b ... Control device 5 ... Indoor unit 6 ... Remote operation panel 6a ... Load factor calculating part (load factor calculating means)
6b ... Temperature controller (temperature control means)
DESCRIPTION OF SYMBOLS 10 ... High temperature regenerator 10a ... Heating device 10b ... Combustion device 12 ... Separator 14 ... Low temperature regenerator 16 ... Condenser 16a ... Cold water heat transfer pipe 16b ... Refrigerant storage chamber 18 ... Evaporator 18a ... Liquid refrigerant distributor 18b ... Cold water transfer Heat tube 20 ... Absorber 20a ... Cold water heat transfer tube 22 ... Solution circulation pump 24 ... High temperature solution heat exchanger 26 ... Low temperature solution heat exchanger 28 ... Temperature sensor

Claims (4)

A priority machine that obtains cold water to be used in an indoor unit by a circulation cycle by an evaporator, an absorber, a regenerator and a condenser, using at least one of exhaust heat and renewable energy as a heating source;
A direct-fired machine that uses the heat generated by burning fossil fuel as a heating source, and obtains cold water used in the indoor unit by a circulation cycle by an evaporator, an absorber, a regenerator, and a condenser;
Load factor calculation means for calculating the load factor of the indoor unit based on information from the priority unit and the direct-access unit;
In the cooling operation, the set temperature of the priority machine is set to be equal to or lower than the set temperature of the direct winder, and the difference between the set temperatures of the priority machine and the direct winder increases as the load factor calculated by the load factor calculation means increases. The cooling control function for reducing the temperature and the setting temperature of the priority machine in the heating operation is equal to or higher than the setting temperature of the direct heating machine, and as the load factor calculated by the load factor calculation means becomes higher, the priority machine And a temperature control means having at least one of heating control functions for reducing the difference in the set temperature of the direct winder ,
When the temperature control means has a cooling control function, the set temperature of the priority machine is lowered during combustion of the direct-fired machine than when the direct-fired machine is stopped, and when it has a heating control function, the direct-fired The set temperature of the priority machine is set higher during combustion of the machine than when the direct-fired machine is stopped.
Absorption type cold / hot water system characterized by that . When the temperature control unit has a cooling control function, the set temperature of the direct-fired machine is increased as the load factor calculated by the load factor calculation unit decreases, and when the temperature control unit has a heating control function, the load factor The absorption-type cold / hot water system according to claim 1, wherein the set temperature of the direct winder is lowered as the load factor calculated by the calculation means decreases. The absorption-type cold temperature according to any one of claims 1 and 2, wherein the temperature control means sets the set temperature of the priority machine to a predetermined standard temperature while the direct-fired machine is stopped. Water system. Further comprising at least heating and cooling remote control panel switching operation is possible, in any one of claims 1 to 3, wherein the remote control panel is characterized in that it comprises the load factor calculating means and said temperature control means Absorption type cold / hot water system of description.

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