JP5489046B2 - Heat source equipment control system - Google Patents

Description

  The present invention relates to a heat source equipment control system for controlling a plurality of devices constituting the heat source equipment according to the heat load of the load equipment in a heat source equipment for supplying a heat medium cooled or heated by a heat source machine to the load equipment.

  Conventionally, for heat source equipment control systems, the heat medium temperature difference (cold water temperature difference) indicating the heat load and the outside air state value (outside air wet bulb temperature) are made independent variables, and each of these independent variables changes. Create an optimal control data table with the optimum load distribution of multiple heat source units (refrigerators) as the dependent variable to minimize the equipment operating cost as the target evaluation value (objective function) for each. There has been proposed a system that reads an optimum load distribution corresponding to a measured heat medium temperature difference and a measured outside air state value at a time point, and controls a plurality of equipment components according to the read optimum load distribution.

  In this proposed system, when calculating the optimal load distribution as the dependent variable of the data table by mathematical programming, the energy balance of each heat source unit (refrigerator), the input / output characteristics based on the operation data, etc. are expressed by linear equations. This is used as a constraint condition (see Patent Document 1).

  In addition, as a heat source equipment control system of the same kind as this, each of the cases where the heat load (cooling load of the air conditioner) and the outside air state value (outside air wet bulb temperature) are made independent variables, and each of these independent variables changes. Create an optimal control data table that uses the optimal control amount of each device as a dependent variable that satisfies the constraints that represent the feasible region of equipment operation and minimizes the target evaluation value (predetermined evaluation function) such as equipment energy consumption. In addition, the optimum control amount of each device corresponding to the measured thermal load and the measured outside air state value at each time point is read on this data table, and the equipment configuration such as the heat source unit, the cooling tower, and the pump is read according to the read optimum control amount. A system for controlling devices has also been proposed (see Patent Document 2).

JP 60-2111269 A JP 2004-293844 A

  In the control system using the data table as described above, the optimal load distribution of the heat source equipment and the optimal control of each device are performed by sequentially performing calculations according to mathematical formulas and simulating the operation of the heat source equipment for changes in the heat load and outside air state values. Compared to the method of calculating the amount, the optimal load distribution of the heat source unit and the optimal control amount of each device can be determined only by referring to the data table, which has the advantage of reducing the control burden such as complicated calculation and simulation is there.

  However, in any of the conventional proposed systems described above, the operating cost and energy consumption are subject to predetermined constraints on the heat load and the outside air state value at each time point as independent variables (in short, search keys). The optimal load distribution that minimizes the optimal load and the optimal control amount of each device are written in the data table as dependent variables in advance. Only the condition determined by the outside air state value can be set as the constraint condition, and therefore, the degree of freedom of operation control is limited and the functionality of the heat source facility is lowered.

  In addition, it is easy to simply increase the number of independent variables in the data table, such as creating a data table in which the independent variables are three values of the heat load, the outside air condition value, and the room temperature of the air-conditioned room. Although increasing the number of variables can increase the fineness of operation control, it is still insufficient to effectively increase the functionality of the heat source equipment (that is, to enable the addition of completely new functions).

  In view of this situation, the main problem of the present invention is that by adopting a rational system configuration for operation control of the heat source equipment, it is possible to effectively improve the functionality of the heat source equipment while taking advantage of the data table. It is in.

The first characteristic configuration of the present invention relates to a heat source equipment control system,
In a heat source facility that supplies a heat medium cooled or heated by a heat source device to a load device, a heat source facility control system that controls a plurality of devices constituting the heat source facility according to the heat load of the load device,
The heat load, the outside air condition value, and the predetermined operating conditions of the heat source equipment are made independent variables, and when each of these independent variables changes, the heat load at that time can be covered, and the heat source equipment consumption Optimum control amount of each device that minimizes the target evaluation value with either the energy, the operating cost, the converted carbon dioxide emission amount or the sum of the values obtained by multiplying at least two of them by a predetermined ratio as the target evaluation value An optimal control data table with
An operation condition selecting means for selecting the optimum content of the predetermined operation condition at each time point using a predetermined selection model based on measurement information or command information;
Optimal control amount setting means for reading out the optimal control amount of each device corresponding to the measured thermal load at each time point, the measured outside air state value, and the optimum content of the predetermined operating condition selected by the operating condition selecting means in the optimal control data table When,
A control means for controlling the plurality of equipment components according to the optimum read control amount by the optimum control amount setting means,
Load prediction means for predicting future heat load sequentially,
The operation condition selection means sequentially and repeatedly sets a new predetermined operation period in accordance with the sequential prediction of the thermal load by the load prediction means,
For each of these new predetermined operating periods, the contents of the predetermined operating conditions that can cover the ever-changing thermal load during the predetermined operating period predicted by the load predicting means, and the target that changes as the thermal load changes The content of the predetermined operation condition that minimizes the integrated value in the predetermined operation period of the evaluation value is selected as the optimum content of the predetermined operation condition,
Further, the operating condition selection means sequentially and repeatedly determines a prediction threshold time point at which it is predicted that a change in the content of the predetermined operating condition is required based on the predicted thermal load with the sequential prediction of the thermal load by the load predicting means. Thus, each time the prediction threshold time is determined, the predetermined operation period with the prediction threshold time as the period start time is set.

  That is, in this first characteristic configuration, basically, as in the conventional proposed system described above, the optimum control amount of each device in accordance with the current situation is read from the optimum control data table, and each of the heat source facilities is read according to this read optimum control amount. Although the energy consumption of the heat source equipment is minimized by controlling the components (minimization of the target evaluation value), the difference from the conventional proposed system is that the heat source equipment is determined in addition to the heat load and the outside air state value. Let the operating condition be one of the independent variables in the optimal control data table.

  And in this optimal control data table, it corresponds to the measured thermal load and the measured outside air state at each time point, and the operation condition selecting means selects the above using the predetermined selection model based on the measurement information and the command information. The optimum control amount of each device corresponding to the optimum content of the predetermined operation condition is read out, and each component device of the heat source equipment is controlled according to this optimum control amount. Therefore, compared with the conventional proposed system, the operation condition selection means uses the predetermined operation condition. An arbitrary new function can be added to the operation control of the heat source equipment with a control part for selecting the optimum content of the heat source equipment, thereby effectively improving the functionality of the heat source equipment.

  Also, since each device is basically controlled by referring to the data table, each device is operated by performing calculations according to mathematical formulas and simulating facility operation for changes in heat load and outside air condition values. Compared with the method for obtaining the optimum control amount, it is possible to reduce the burden on control such as complicated calculation and simulation, thereby ensuring high responsiveness to a change in situation.

  In addition to this, in the first feature configuration, the operating condition selecting means repeatedly sets a new predetermined operating period sequentially in accordance with the sequential prediction of the thermal load by the load predicting means, and for each new predetermined operating period. The content of the predetermined operation condition that can cover the heat load that changes every moment during the predetermined operation period predicted by the load predicting means, and the integrated value in the predetermined operation period of the target evaluation value that changes with the change of the heat load is minimum Since the content of the predetermined operating condition is selected as the optimum content of the predetermined operating condition, the following effects are also obtained.

  That is, in the case where a plurality of heat source machines are used, an example in which a combination of operating heat source machines (hereinafter abbreviated as operating heat source machines) among the plurality of heat source machines is set as a predetermined operating condition. When heat source equipment of different types includes different types of heat source equipment with different capacities, performances, types, structures, etc., the heat source equipment has different characteristics depending on the relationship between the combination of operating heat source equipment (that is, the contents of the predetermined operating conditions) and the heat load at each point Although the energy consumption is different, the heat load is constantly changing from the previous combination change of the operating heat source machine to the next combination change (that is, from the previous change of the predetermined operating condition to the next change of content). Therefore, in the conventional general change method that changes the combination of operating heat source units only according to the current heat load at the time of changing the combination, the combination of the operating heat source units is aimed at minimizing energy consumption. Further, even if a combination that minimizes the energy consumption with respect to the heat load at that time is selected, the combination does not necessarily minimize the energy consumption thereafter. Frequent combination changes cause deterioration of heat source equipment and unstable equipment operation, so there is a limit to responding with higher frequency of combination changes. There is a problem that cannot be achieved effectively.

  The same applies to the case of aiming to minimize the operating cost or the purpose of minimizing the equivalent carbon dioxide emission.

  In response to this situation, according to the first characteristic configuration, the content of the predetermined operation condition that can cover the heat load that changes every moment during the predetermined operation period predicted by the load predicting means for each new predetermined operation period, and The content of the predetermined operation condition in which the integrated value in the predetermined operation period of the target evaluation value that changes with the change of the thermal load is minimized is the optimum content of the predetermined operation condition (in the example of the combination of the operation heat source devices described above, The optimal combination of operating heat source units) is selected, that is, in the operation control as described above using the optimal control data table, the equipment component equipment such as the heat source unit is controlled in accordance with the selected optimal content. Compared to the conventional general method of changing the contents of the predetermined operating conditions, such as the combination of operating heat source units only according to the heat load, the frequent change of the predetermined operating conditions is avoided and the expected energy consumption etc. is minimized. Reduction (minimization of the target evaluation value) can be achieved more effectively and reliably.

In the first characteristic configuration, the operation condition selecting means changes the content of the predetermined operation condition based on the predicted heat load (sequential example of the combination of the operation heat source units described above) along with the sequential prediction of the heat load by the load prediction means. In other words, the predetermined operation in which the prediction threshold time point that is predicted to require a combination change of the operation heat source device is sequentially and repeatedly determined, and the prediction threshold time point is set as the period start point for each determination of the prediction threshold time point. Since a period is set, each time such a prediction threshold time is determined, a new predetermined operation period with the prediction threshold time as the period start time is set, and a predetermined operation condition is set for each new predetermined operation period. The optimal content is selected.
The predetermined operation period is not limited to a fixed period length, and the period length may be appropriately changed according to the situation.
In addition, the predetermined operating conditions of the heat source equipment that are the independent variables of the optimal control data table together with the heat load and the outside air state value, and the predetermined operating conditions for selecting the optimum content by the operating condition selecting means are the operating heat source machines exemplified above. As long as the operating conditions can select the optimum content by the operating condition selection means using a predetermined selection model based on the measurement information or the command information, any operating conditions may be used. Chiller outlet chilled water temperature and cooling tower outlet chilled water temperature are set as predetermined operating conditions as independent variables in the data table, and the optimum contents of the predetermined operating conditions are selected as the chiller outlet chilled water temperature and cooling tower outlet cooling. The optimum value of the water temperature may be selected by the operating condition selecting means using a predetermined selection model based on the measurement information or the command information.
The second feature configuration of the present invention specifies an embodiment suitable for the implementation of the first feature configuration.
The operation condition selection means predicts a re-threshold time point at which the content change is predicted again for the predetermined operation condition after the content change based on the predicted thermal load by the load prediction means for each setting of the predetermined operation period. The predetermined operation period is set with the predicted rethreshold time as the end time of the period.
According to this second characteristic configuration, the predicted rethreshold time is determined for each setting of the predetermined operation period, and the predetermined operation period is set with the predicted rethreshold time as the end of the period.
The third feature configuration of the present invention specifies an embodiment suitable for the implementation of the first or second feature configuration.
The control means determines an actual threshold time point at which the content change is actually necessary for the content of the predetermined operating condition at the present time based on the current heat load obtained from the data related to the heat load, and at this actual threshold time point It is the point which is set as the structure which controls the said equipment component apparatus according to the newest optimal content of the said predetermined driving | running condition currently selected.
According to the third characteristic configuration, the equipment component equipment is controlled according to the latest optimum content of the predetermined operation condition selected at that time at the actual threshold time.

The fourth characteristic configuration of the present invention specifies an embodiment suitable for the implementation of any of the first to third characteristic configurations,
A data table creation means for automatically creating the optimum control data table by simulating the operation of the heat source equipment based on the equipment data of the equipment constituting equipment is provided.

  In other words, according to this configuration, it is possible to easily create an optimal control data table during the initial operation of the heat source equipment, and when the equipment is refurbished, A suitable optimum control data table can be easily created on site.

The fifth feature configuration of the present invention specifies an embodiment suitable for the implementation of the fourth feature configuration.
The data table creation means includes operating data obtained by simulating heat source equipment operation based on equipment data of the equipment constituting equipment, and operating data obtained by actual heat source equipment operation in which the equipment constituting equipment is controlled by the control means. The optimum control data table is automatically corrected based on the data difference.

  That is, according to this configuration, each device optimum control amount (that is, the optimum control amount of each device that minimizes the target evaluation value such as energy consumption) of the dependent variable in the optimum control data table due to aging deterioration of each device or the like. Even if an error that does not match the current situation occurs, the automatic correction function as described above of the data table creation means can correct and maintain the optimum control data table in accordance with the current equipment. Minimization of energy consumption and the like can be achieved more reliably and effectively, and instability of equipment operation control due to the errors as described above can be effectively prevented.

The sixth characteristic configuration of the present invention specifies an embodiment suitable for the implementation of any of the first to fifth characteristic configurations,
The target evaluation value when the equipment component device is controlled according to the optimum read control amount by the optimum control amount setting means, and the target evaluation when the equipment component device is controlled according to the thermal load by another operation control method It is in the point provided with the evaluation means which contrasts with a value.

  In other words, according to this configuration, how effective the operation control using the optimum control data table of the present invention is to minimize the energy consumption, the operation cost, or the equivalent carbon dioxide emission amount compared to the case of adopting another operation control method. It can be easily recognized by comparison with the evaluation means.

The seventh characteristic configuration of the present invention specifies an embodiment suitable for implementing any of the first to sixth characteristic configurations,
The optimum control data table has the thermal load, the outside air state value, and a plurality of types of predetermined operating conditions as independent variables,
The operation condition selection means is configured to select the optimum content at each time point for each of the plurality of types of predetermined operation conditions using a predetermined selection model based on measurement information or command information.

  That is, according to this configuration, it is possible to add a plurality of arbitrary new functions to the operation control of the heat source facility with a control part that selects the optimum content of each of the plurality of types of predetermined operation conditions by the operation condition selection unit. The functionality of the heat source facility can be improved more effectively.

Overall configuration of heat source equipment Block diagram of monitoring device and control device Schematic diagram of optimal control data table Step-up machine selection flowchart Integration time calculation flowchart for additional stages A graph explaining the selection of additional machines Reducer selection flowchart Accumulated time calculation flowchart for step reduction Graph explaining the selection of stage reduction machine Block diagram explaining how to use optimal control data table

  FIG. 1 shows a heat source facility for air conditioning, and this facility includes a plurality of refrigerators R capable of adjusting output (that is, capacity control) as heat source units, and each refrigerator R is provided with a cooling tower via a cooling water circulation path 1. CT is connected individually. These refrigerators R include different types having different capacities, performances, types, structures, and the like.

  2a is a primary header that receives chilled water C as a heat medium supplied in parallel from each refrigerator R through a primary chilled water outbound path 3a, and 2b is a chilled water C from the primary header 2a through a plurality of chilled water relay paths 3b. Each of the load devices by supplying the cold water C from the secondary header 2b to the plurality of load devices U such as air conditioners in parallel through the secondary cold water forward path 3c. In U, the chilled heat of the supplied chilled water C is consumed for a required purpose such as cooling.

  Reference numeral 2c denotes a return header that receives the chilled water C that has been heated by cold consumption from each load device U through the secondary chilled water return path 3d, and returns the received chilled water C to each refrigerator R through the primary chilled water return path 3e. The chilled water circulation system connecting the refrigerator R and the load device U is on the primary side (heat source side) which is the refrigerator R side and the load device U side with the primary header 2a and the return header 2c as a boundary. It is divided into a certain secondary side (load side).

  In addition to the refrigerator R, the cooling tower CT, and the load device U, the heat pump equipment includes a primary pump PA installed in the primary chilled water return path 3e to each chiller R, and a chilled water relay path 3b. Secondary pump PB, cooling water pump PC equipped in each cooling water circulation path 1, etc., and these pumps PA, PB, PC can adjust the rotation speed of the pump motor by frequency control using the inverter device INV equipped in each. It is a variable pump capable of continuously adjusting the pump flow rate.

  Further, each of the cooling tower CT, the cooling water pump PC, and the primary pump PA is started / stopped in accordance with the start / stop of the corresponding refrigerator R, and the secondary pump PB is supplied with the cold water supply pressure or the cold water supply amount to each load device U. Alternatively, the number of operating units and individual pump flow rates are adjusted so as to keep the amount of heat supplied from the cold water appropriately.

  In this example, each of the primary pump PA, the secondary pump PB, and the cooling water pump PC is a variable pump capable of continuously adjusting the pump flow rate. However, in some cases, the pump PA, PB, PC Any one of the pumps may be a fixed flow rate pump, and only one or two other types of pumps may be variable pumps capable of adjusting the flow rate.

  Va is an open / close valve provided in each of the primary side cold water outbound paths 3a, and these open / close valves Va are opened by the control device 6 described later when the corresponding refrigerator R and primary pump PA are operated.

  Vb is a flow rate adjusting valve provided in each load device U. Under the chilled water circulation by the primary pump PA and the secondary pump PB, the flow rate adjusting valve Vb causes the chilled water flow rate of each load device U to be changed in each load device U. It is adjusted according to the required amount of cold q (that is, the thermal load of each load device U).

  Vs is a flow rate adjusting valve for adjusting the flow rate balance provided on the balance path 3f extending between the primary header 2a and the secondary header 2b, and this flow rate adjusting valve Vs is measured by a sensor S described later. According to the cold water pressure in the side header 2b, the opening degree is adjusted so as to keep the cold water pressure at an appropriate value.

  Reference numeral 4 denotes a bypass path that short-circuits the primary header 2a and the return header 2c, and the cold water flow through the bypass path 4 absorbs the difference in the chilled water flow rate between the primary side and the secondary side. That is, in the state where the flow rate of the chilled water on the primary side is larger than that on the secondary side, the difference chilled water C flows from the primary side header 2a to the return side header 2c through the bypass path 4, and conversely than the primary side. In the state where the secondary side cold water flow rate is large, the difference of the cold water C flows from the return side header 2c through the bypass 4 toward the primary side header 2a.

  As sensors S for measuring the flow rate, temperature, pressure, etc. of each part, the flow rate of each primary pump PA, the water supply pressure, the inlet chilled water temperature, the outlet chilled water temperature, the inlet cooling water temperature, the outlet cooling water temperature of each refrigerator R, The chilled water pressure in the secondary header 2b, the inlet chilled water temperature, the outlet chilled water temperature, the inlet chilled water pressure, the outlet chilled water pressure of each load device U, the total flow rate of the return chilled water C from each load device U (ie, the secondary chilled water flow rate). ), Which measures the flow rate of each cooling water pump PC, the inlet cooling water temperature, the outlet cooling water temperature, the outside air temperature, the humidity and the like of each cooling tower CT.

  Reference numeral 5 denotes a monitoring device that monitors the heat source equipment, and reference numeral 6 denotes a control device that controls equipment constituting the equipment. Both of them can communicate with each other via a communication means 7 such as Ethernet (registered trademark). The equipment control system is constituted by the control device 6, the communication means 7, and the various sensors S described above.

  As shown in FIG. 2, the monitoring device 5 is physically composed of a computer system including an input / output unit 5a, a calculation unit 5b, and a storage unit 5c, and functionally a data table by executing a program stored in the storage unit 5c. It functions as creating means 5A, load predicting means 5B, refrigerator selecting means 5C as operating condition selecting means, optimum control amount setting means 5D, evaluation means 5E, and the like. Specifically, the monitoring device 5 functions as these means 5A to 5E as follows.

[A] The monitoring device 5 executes the following a1 to a3 as the data table creation means 5A.
a1. The thermal load Q (= Σq) and the outside wet bulb temperature as a whole equipment by optimization simulation using an appropriate optimization method such as mathematical programming based on the equipment data of each equipment component equipment stored in the storage unit 5c The combination of the tow and the combination of the operating refrigerator R, which is one of the operating conditions of the heat source equipment (in this example, the refrigerator combination number K) is an independent variable (search key) and the flow rate of each device Then, an optimum control data table D (S) as shown in FIG. 3 is automatically created with control variables such as pressure and temperature and power consumption as dependent variables d1 to dn (data).

  The dependent variables d1 to dn are specifically the inlet cooling water temperature, the outlet cooling water temperature, the power consumption, the flow rate of each cooling water pump PC, the power consumption, the inlet cooling water temperature of each refrigerator R, and the outlet. Cold water temperature, inlet cooling water temperature, outlet cooling water temperature, power consumption, flow rate of each primary pump PA, power consumption, and the like.

  The optimum control data table D (S) optimizes the optimum operating state in which the energy consumption E of the heat source equipment is minimized for each assumed case when each of the three independent variables Q, tow, and K is finely changed. The values of the dependent variables d1 to dn obtained by simulation and indicated in the optimum operating state of each assumed case (that is, the optimum control amount in each assumed case and the power consumption of each device at the optimum control amount) are used as data values. It is written.

  In addition, as this optimal control data table D (S), with respect to carrying out capacity control of the refrigerator R so that the exit cold water temperature of the refrigerator R may become a set value, the set value of the exit cold water temperature is stepwise. A table for each outlet chilled water temperature (optimum control data table Dc (S) for each chilled water temperature) may be created.

  Further, the optimum control data table D (S) is created by dividing it into a plurality of divided tables, for example, according to seasons, operation modes of equipment or parts of equipment, and each of these divided tables is data (attribute). And method (operation) are created as a packaged object-oriented data table, and only the necessary partition table is read into the memory at each point in time, thereby reducing the required memory capacity and partitioning. Each process such as table creation, deletion, update, and modification can be easily performed.

  a2. The measured values and controls of the sensors S correspond to the occurrence of errors in the data values (written values) on the optimum control data table D (S) for the dependent variables d1 to dn due to aging degradation of each device. Based on the operating state of each device sent from the device 6, the optimum control data table D (S) is updated as needed according to the equipment state at that time.

  That is, the operation data obtained by simulating the heat source equipment operation based on the equipment data of each equipment and the operation obtained by the actual heat source equipment operation in which each equipment is controlled by the control device 6 using the optimum control data table D (S). The optimum control data table D (S) is automatically and sequentially corrected based on the data difference from the data (that is, the operation data changed due to aging deterioration of each device).

  a3. To compare the case where the equipment is controlled according to the optimum control data table D (S) and the case where the equipment is controlled using another operation method such as a constant flow method in which each pump is operated only at the rated flow. A comparison control data table D ′ (S) similar to the optimum control data table D (S) in the case of using another operation method is created.

  The comparison control data table D ′ (S) is not limited to one type, and a plurality of types of comparison control data tables may be created when each of a plurality of other operation methods is used.

[B] The monitoring device 5 executes the following b1 and b2 as the load prediction means 5B.
b1. Various data relating to the thermal load Q, such as past and present data of the thermal load Q (= Σq) calculated based on the measurement value of the sensor S, past and present weather data obtained from the outside, and future weather forecast data Based on the above, the future heat load Q is predicted using a predetermined prediction model.

  b2. In this heat load prediction, a set time interval ΔT (for example, 10 minutes) from the current time to the upper limit integrated time Tmax (for example, several hours) is basically linked with the selection of the optimum combination of operating refrigerators by the refrigerator selection means 5C described later. ) Is sequentially predicted.

[C] The monitoring device 5 executes the following c1 to c8 as the refrigerator selection means 5C (operating condition selection means).
c1. As the optimum content selection of the predetermined operating condition in the heat source facility, during the predetermined operation period X after the load predicting means 5B predicts the combination K of the operating refrigerator R in the predetermined operation period X by selection using a predetermined selection model. A combination that can cover the predicted heat load Q of the heat source equipment, and the energy consumption E of the heat source facility as a target evaluation value, and a combination that minimizes the integrated value ΣE of the consumption energy E (target evaluation value) in the predetermined operation period X, The optimum combination Kx of the operation refrigerator R during the predetermined operation period X is selected.
In other words, the optimum combination number Kx that minimizes the integrated value ΣE is selected from all the refrigerator combination numbers K.

  c2. Specifically, the optimum combination Kx of the operating refrigerators R when the number of operating refrigerators R is increased is selected according to the step-up machine selection flowchart shown in FIG. 4 (in other words, the optimum stage-up refrigerator R is selected). At the same time, the optimum combination Kx of the operation refrigerators R when the number of the refrigerators R to be operated is reduced is selected according to the stage reduction machine selection flowchart shown in FIG. 7 (in other words, the optimum stage reduction refrigerator R is selected).

  c3. That is, in the step-up machine selection flowchart of FIG. 4 (see FIG. 6), in # 1, one of the currently stopped refrigerators R is added to the currently operating refrigerator R as the operating refrigerator R (increase). In step # 2, all the combinations K of the operating refrigerators R after the stage increase are extracted, and then in # 2, the total capacity ΣG of the currently operating refrigerator R before the stage increase (each of the operating refrigerators R) (The sum of the maximum outputs G).

  In # 3, the predicted thermal load Q (ts) for the time ts after the set time Ts (for example, 10 minutes) after the current time predicted by the load prediction means 5B is read. In # 4, the predicted thermal load read in # 3. Q (ts) and the total capacity ΣG of the operating refrigerator R calculated in # 2 are compared [Q (ts)> ΣG? ].

  In the comparison in # 4, when the predicted heat load Q (ts) at the time ts after the set time Ts is larger than the total capacity ΣG of the operating refrigerator R [Q (ts)> ΣG], in # 5 The evaluation value integration time Tx is calculated.

  The evaluation value integration time Tx in # 5 is calculated according to the step-up integration time calculation flowchart shown in FIG. 5. In this step-up integration time calculation flowchart, in # 5-1, the currently stopped refrigerator Among R, the one having the smallest capacity G (maximum output) is selected.

  In # 5-2, the minimum total capacity ΣGmin ′ after the stage increase is calculated by adding the capacity of the refrigerator R selected in # 5-1 to the total capacity ΣG of the refrigerator R currently in operation.

  In the counting process, N = 0 is set at # 5-3, and then N = N + 1 is set at # 5-4. Then, at # 5-5, the prediction target time point to be predicted by the load prediction means 5B (that is, the above-described time) Read the predicted heat load Q (N) for the time (ts + (ΔT × N)) that is further (ΔT × N) time after the time ts at # 3, and read it at # 5-5 at # 5-6 The predicted heat load Q (N) is compared with the minimum total capacity ΣGmin ′ after the step increase calculated in # 5-2 [Q (N)> ΣGmin ′?].

  Then, in the comparison at # 5-6, # 5-4 to # 5-6 are repeated until the predicted thermal load Q (N) becomes larger than the minimum total capacity ΣGmin ′ after the increase, and # 5-6 If the predicted thermal load Q (N) is larger than the minimum total capacity ΣGmin ′ after the step increase [Q (N)> ΣGmin ′] in the comparison in FIG. [Tx = ΔT × N] is determined for the N value.

  Returning to the step-up machine selection flowchart shown in FIG. 4, in # 6, the evaluation value integration time Tx (= ΔT × N) calculated in # 5 is compared with the upper limit integration time Tmax [Tx <Tmax? In this comparison, if the evaluation value integration time Tx calculated in # 5 is smaller than the upper limit integration time Tmax, the process proceeds to # 8 as it is.

  On the other hand, when the evaluation value integration time Tx calculated in # 5 in the comparison in # 6 is equal to or greater than the upper limit integration time Tmax [Tx ≧ Tmax], and in the previous comparison in # 3, the predicted thermal load Q at the time ts. When (ts) is equal to or less than the total capacity ΣG of the operating refrigerator R [Q (ts) ≦ ΣG], the evaluation value integration time Tx is limited to [Tx = Tmax] in # 7, and then the process proceeds to # 8.

  In # 8, the period corresponding to the evaluation value integration time Tx for all the combinations K of the operating refrigerators R after the stage increase extracted in # 1 (that is, the time ts at that time is the start time, and the time ts at that time Period integrated value ΣE (that is, predetermined operation) when the predicted heat load Q is processed in the refrigerator operation of each combination K during the period when the evaluation value integration time Tx has elapsed from the time point) (Integrated energy consumption value during period X) is calculated.

  In # 9, among the combinations K of the operating refrigerator R extracted in step # 1 after the step increase, the combination in which the period integrated value ΣE of the consumed energy E calculated in # 8 is the minimum is the operation after the step increase. The optimum combination Kx of the refrigerator R is determined, and this is output to the control device 6.

  c4. That is, in the selection of the optimum combination for increasing the stage, the refrigerator selecting unit 5C as the operating condition selecting unit predicts by the load predicting unit 5B as the determination of the point in time when it is predicted that the content of the heat source facility operating condition needs to be changed. Based on the heat load Q (ts) and the capacity G of each refrigerator R, the prediction that a combination change (increase) with an increase in the number of operating refrigerators is required for the combination K of the current operating refrigerator R A threshold time point (that is, a ts time point when Q (ts)> ΣG at # 4) is determined, and this predicted threshold time point ts is set as the start time point of the predetermined operation period X.

  In addition, as a determination of when it is predicted that a change in the operation conditions after the change will be necessary, based on the predicted thermal load Q (N) by the load prediction means 5B and the capacity G of each refrigerator R, after the combination change For the combination of the operating heat source equipment R (after stage increase), a predicted rethreshold time point (ie, Q ( N)> ΣGmin ′ (time point (ts + Tx)) is determined, and the predicted rethreshold time point (ts + Tx) is set as the end point of the predetermined operation period X.

  Then, the refrigerator selecting means 5C sets the predetermined operation period X after the stage increase based on the heat load prediction in this way, and then the combination K (that is, the stage increase of the operation refrigerator R in the predetermined operation period X). (The latter combination) is a combination that can cover the predicted thermal load Q during the predetermined operation period X predicted by the load predicting means 5B, and the consumed energy E of the heat source facility is set as the target evaluation value. Value) in the predetermined operation period X is selected as the optimum combination Kx that minimizes the integrated value ΣE (that is, the integrated value of the target evaluation value that changes momentarily with the thermal load).

  Each time the refrigerator selecting means 5C determines the predicted threshold time point ts with respect to a change in the situation over time typified by a change with time in the predicted heat load Q or the like (that is, Q (ts) at # 4). > Each time ΣG is determined), a new predetermined operation period X starting from the predicted threshold time ts is set, and the post-stage increase optimum combination Kx is selected for each new predetermined operation period X. .

  Further, when the predicted threshold time ts is not determined for the combination of the current operating refrigerator R (that is, Q (ts) ≦ ΣG in # 4), the calculated evaluation value integration time Tx is equal to or greater than the upper limit integration time Tmax ( That is, when Tx ≧ Tmax at # 6), the period from the present time to the time after the set time (in this example, the upper limit integrated time Tmax) is defined as the provisional predetermined operation period X ′, and the provisional predetermined operation period X ′ is described above. The optimum combination Kx after the stage increase is selected, thereby improving the accuracy and reliability of the optimum combination selection based on the heat load prediction.

  c5. On the other hand, in the step-down machine selection flowchart of FIG. 7 (see FIG. 9), in step # 1, the operating refrigerator R after the stage reduction when one of the currently operating refrigerators R is stopped (stage reduction). Next, in # 2, the maximum total of the total capacities ΣG ′ of the operating refrigerators R obtained in each combination K of the operating refrigerators R after the step-down extracted in # 1 is extracted in # 2. The ability ΣGmax ′ is calculated.

  In # 3, the predicted thermal load Q (ts) for the time ts after the set time Ts (for example, 10 minutes) after the current time predicted by the load predicting means 5B is read, and in # 4, after the step reduction calculated in # 2 Is compared with the predicted thermal load Q (ts) read in # 3 [ΣGmax ′> Q (ts)? ].

  In the comparison in # 4, the maximum total capacity ΣGmax ′ after step reduction calculated in # 2 is larger than the predicted thermal load Q (ts) at the time ts after the set time Ts [ΣGmax ′> Q (ts)]. In this case, the evaluation value integration time Tx is calculated in # 5.

  The evaluation value integration time Tx in # 5 is calculated according to the step-down integration time calculation flowchart shown in FIG. 8. In this step-down integration time calculation flowchart, in step # 5-1, the currently operating refrigerator All combinations K of the operating refrigerator R after the re-stage reduction when two of R are stopped (that is, the stage again) are extracted.

  Subsequently, at # 5-2, the maximum total capacity ΣGmax ″ of the total capacities ΣG ″ of the operating refrigerators R obtained by the respective combinations K of the operating refrigerators R after the step-reduction extracted at # 5-1 is determined. Calculate.

  In the counting process, N = 0 is set at # 5-3, and then N = N + 1 is set at # 5-4. Then, at # 5-5, the prediction target time point to be predicted by the load prediction means 5B (that is, the above-described time) Read the predicted heat load Q (N) for the time (ts + (ΔT × N)) that is further (ΔT × N) time after the time ts at # 3, and at # 5-6, calculate with # 5-2 The maximum total capacity ΣGmax ″ after the re-decreasing step is compared with the predicted thermal load Q (N) read in # 5-5 [ΣGmax ″> Q (N)?]

  Then, in the comparison in # 5-6, # 5-4 to # 5-6 are repeated until the maximum total capacity ΣGmax ″ after the re-decreasing step becomes larger than the predicted thermal load Q (N), and # 5- When the maximum total capacity ΣGmax ″ after the re-decreasing stage is larger than the predicted heat load Q (N) in the comparison in 6 [ΣGmax ″> Q (N)], the evaluation value integration time Tx is calculated in # 5-7. [Tx = ΔT × N] for the N value at that time.

  Returning to the step-down machine selection flowchart shown in FIG. 7, at # 6, the evaluation value integration time Tx (= ΔT × N) calculated at # 5 is compared with the upper limit integration time Tmax [Tx <Tmax? In this comparison, if the evaluation value integration time Tx calculated in # 5 is smaller than the upper limit integration time Tmax, the process proceeds to # 8 as it is.

  On the other hand, when the evaluation value integration time Tx calculated in # 5 in the comparison in # 6 is equal to or greater than the upper limit integration time Tmax [Tx ≧ Tmax], the evaluation value integration time Tx is limited to [Tx = Tmax] in # 7. Proceed to # 8 above.

  In # 8, the period corresponding to the evaluation value integration time Tx is set for all combinations K of the operating refrigerators R after the step reduction extracted in # 1 (that is, the time ts at that time is the start time, and the time ts at that time is Period integrated value ΣE (that is, predetermined operation) when the predicted heat load Q is processed in the refrigerator operation of each combination K during the period when the evaluation value integration time Tx has elapsed from the time point) (Integrated energy consumption value during period X) is calculated.

  In # 9, among the combinations K of the operating refrigerator R extracted after the step reduction extracted in # 1, the combination in which the period integrated value ΣE of the consumed energy E calculated in # 8 is the minimum is operated after the step reduction. Extracted as the optimal combination candidate K ′ of the refrigerator R.

  Subsequently, in # 10, whether or not the secondary chilled water flow rate becomes insufficient in the operation of the load device U when the step reduction using the optimum combination candidate K ′ extracted in # 9 is performed. Determination is made by referring to the optimal control data table D (S) or the like, and if there is no shortage of the secondary chilled water flow rate in this determination, the optimal combination candidate K ′ extracted in # 9 is operated after step reduction in # 11. The optimum combination Kx of the refrigerator R is determined [Kx = K ′], and this is output to the control device 6.

  Further, when the secondary side chilled water flow rate is insufficient in the determination at # 10, and the maximum total capacity ΣGmax ′ after the step reduction in the comparison at # 4 is the predicted heat at the time ts after the set time Ts. When the load Q (ts) or less [ΣGmax ′ ≦ Q (ts)], a step-reduction prohibition command is output to the control device 6 at # 12.

  c6. In other words, in selecting the optimum stage reduction combination, the refrigerator selecting unit 5C as the operation state selecting unit predicts the load by the load predicting unit 5B as a determination of when it is predicted that the contents of the heat source facility operating conditions need to be changed. Based on the thermal load Q (ts) and the capacity of each refrigerator R, a prediction threshold that is predicted to require a combination change (stage reduction) with a decrease in the number of operating refrigerators for the combination K of the currently operating refrigerator R A time point (that is, a time point ts when ΣGmax ′> Q (ts) is satisfied at # 4) is determined, and the predicted threshold time point ts is set as a start time point of the predetermined operation period X.

  In addition, as a determination of when it is predicted that a change in the operation conditions after the change will be necessary, based on the predicted thermal load Q (N) by the load prediction means 5B and the capacity G of each refrigerator R, after the combination change The predicted rethreshold time point (ie, ΣGmax ″ at # 5-6) at which the combination change (re-stage) associated with a decrease in the number of operating refrigerators is again required for the combination of the operating refrigerator R (after stage reduction). > (Q (N) (ts + Tx)) is determined, and the predicted rethreshold time (ts + Tx) is set as the end point of the predetermined operation period X.

  The refrigerator selecting means 5C sets the predetermined operation period X after the step reduction based on the heat load prediction in this way, and then the combination K (that is, the step reduction) of the operation refrigerator R in the predetermined operation period X. (The latter combination) is a combination that can cover the predicted thermal load Q during the predetermined operation period X predicted by the load predicting means 5B, and the consumed energy E of the heat source facility is set as the target evaluation value. Value) in the predetermined operation period X is selected as the optimal combination Kx (however, in this example, 2 after the step reduction). Select under conditions that do not cause a shortage in the flow rate of the secondary side cold water).

  As in the case of selecting the optimum combination for increasing the stage, the refrigerator selecting unit 5C sets the predicted threshold time point ts for the change in the situation over time represented by the change with time of the predicted heat load Q. Each time a determination is made (that is, every time ΣGmax ′> Q (ts) is determined in # 4), a new predetermined operation period X starting from the predicted threshold time ts is set, and the new predetermined operation is set. The optimal combination Kx after step reduction is selected for each period X.

  When the calculated evaluation value integration time Tx is equal to or greater than the upper limit integration time Tmax (that is, Tx ≧ Tmax at # 6), the period from the current time to the time after the set time (in this example, the upper limit integration time Tmax) As the period X ′, the optimum combination Kx after step reduction is selected for the provisional predetermined operation period X ′.

  c7. In each of the selection of the optimum combination for increasing the stage and the selection of the optimum combination for reducing the stage, the integrated value ΣE of the energy consumption E (target evaluation value) in the predetermined operation period X is calculated for each combination K of the refrigerator R (that is, In the calculation process of # 8 in the flowcharts of FIGS. 4 and 7, the combination of the thermal load Q (= Σq), the outside wet bulb temperature tow, and the operating refrigerator R, as in the optimum control data table D (S). (Refrigerator association number K) is an independent variable (search key), and the heat source facility calculated in advance for each assumed case when each of these three independent variables Q, tow, and K is finely changed. An object-oriented energy consumption calculation data table D (E) having energy consumption E as a dependent variable is created in advance.

  Then, the thermal load Q predicted by the load predicting unit 5B and the outdoor wet bulb temperature tow also predicted by the load predicting unit 5B are collated with the consumed energy calculation data table D (E), and the predicted thermal load for each time point. Q and the energy consumption E for each refrigerator combination number K corresponding to the predicted outdoor wet bulb temperature tow are read, and the energy consumption E for each refrigerator combination number K at each time point read in this way is also used as the refrigerator combination number K. For each combination K of the refrigerators R, an integrated value ΣE of the energy consumption E in the predetermined operation period X is obtained.

  In addition, the integrated value ΣE of the energy consumption E (target evaluation value) is calculated for each combination K of the refrigerators R, and a specific example is used to extract the combination of the operating refrigerators R that minimizes the calculated value ΣE. Such a calculation method or extraction method is not limited to the method using the energy consumption calculation data table D (E) as described above, and various methods can be adopted.

  c8. In the selection of the optimum combination for the above-mentioned stage increase, all of the currently operating refrigerators R are left as the operating refrigerators R in the optimum combination Kx, and the optimum combination for the above-mentioned stage reduction is the optimum. All the operating refrigerators R in the combination Kx are selected from the currently operating refrigerators R. Instead of or in parallel with such an optimal combination selection of the operating machine continuous type, step increase and decrease An operating refrigerator that minimizes the integrated value ΣE of energy consumption E (target evaluation value) during a predetermined operation period X regardless of whether each of the refrigerators R included in the optimum combination Kx is currently in operation for each stage. The combination of R may be selected as the optimum combination Kx. In other words, a random-type optimum combination may be selected.

  Further, switching between the optimum combination selection of the continuous operation type and the optimum combination selection of the random type as described above, and the increase order and reduction order set in advance for each refrigerator R are followed. It may be possible to switch between adopting a combination change of priority order formulas for increasing or decreasing each time in order and a combination change by selecting the optimum combination as described above.

  A set time Ts for determining the prediction threshold time ts, a set time interval ΔT for calculating the evaluation value integration time Tx, and an upper limit integration time as an upper limit value of the evaluation value integration time Tx (period length of the predetermined operation period X) Each of Tmax does not necessarily have to be the same time for selection of the optimum combination for the stage increase and selection of the optimum combination for the stage reduction, and selection of the optimum combination for the stage increase and selection of the optimum combination for the stage reduction. And different times.

[D] The monitoring device 5 executes the following d1 to d3 as the optimum control amount setting means 5D.
d1. Optimal control data using the three factors of the current heat load Q and the current outside air wet bulb temperature tow calculated based on the measured value of the sensor S and the combination of the current operating refrigerator R (refrigerator combination number K) as search keys. By collating with the table D (S), the flow rate, pressure, temperature, etc. of each device among the data values d1 to dn corresponding to the current thermal load Q, the outdoor wet bulb temperature tow, and the refrigerator combination number K The optimum control amount is read sequentially, and the read optimum control amount is output to the control device 6.

  Note that the combination of the currently operating refrigerator R (refrigerator combination number K) referred to here is the latest optimum combination Kx (selection of refrigerators) that the control device 6 changes based on the necessity determination of the increase / decrease stage, as will be described later. Selection optimum combination by means 5C).

  d2. Further, when the optimum control data table Dc (S) for each cold water temperature is created as the optimum control data table D (S), the current heat load Q, the current outside air wet bulb temperature tow and the current The three combinations of the operating refrigerator R (refrigerator combination number K) are collated with the optimum control data table Dc (S) for each chilled water temperature to set the chilled water temperature (that is, the outlet chilled water temperature of the refrigerator R). Value), and read out the optimal control amount such as the flow rate, pressure, temperature, etc. of each device and the power consumption of each device, and calculate the sum of the power consumption of each device for each chilled water temperature. The optimal control amount of each device at the cold water temperature at which the sum of the power consumption is minimized is output to the control device 6.

  d3. The control amount change speed suitable for changing the current control amount (especially the flow rate) of each device to the above-mentioned optimum control amount is obtained for each control amount based on the device data, etc., and the obtained control amount change The speed is output to the control device 6 as the designated change speed.

[E] The monitoring device 5 executes the following e1 as the evaluation means 5E.
e1. In the situation where the facility is controlled according to the optimum control data table D (S), if there is an instruction for energy saving evaluation, the total power consumption of each device currently measured (that is, the current energy consumption E of the facility) is measured. And the current energy consumption E ′ of the facility when the facility is controlled using another operation method in accordance with the control data table D ′ (S) for comparison is stored in the control data table D ′ (S) for comparison, etc. Calculate based on.

  Then, as a comparison between both of the calculated energy consumptions E and E ′, the difference ΔE (= E′−E) is displayed on a monitor or the like as the current energy saving amount (that is, the current energy saving effect).

  When the facility is controlled according to the optimal control data table D (S) and the facility is controlled using another operation method according to the control data table D ′ (S) for comparison with the display of the energy saving amount ΔE, respectively. The consumed energy E, E ′ and the consumed power for each device may be displayed in a comparative manner.

  Further, the integrated value ΣΔE (that is, the period energy saving amount) of the energy saving amount ΔE for the specified operation period may be displayed.

  [F] On the other hand, when the monitoring device 5 is the refrigeration unit selecting means 5C as described above, the optimum combination Kx of the respective operating refrigeration machines R is output as the chiller selection means 5C, and the optimum control amount setting means 5D In response to the output of the optimum control amount, the control device 6 executes the following f1 to f5.

  f1. As the determination of the actual threshold time point at which the change of the operation conditions of the heat source facility is actually required, the current thermal load Q calculated based on the measured value of the sensor S and the total capacity ΣG of the refrigerator R currently in operation Based on the comparison and the operating state of each device, the combination change (that is, increase or decrease) of the operation refrigerator R with the increase or decrease of the number of operation of the refrigerator is currently performed for the combination K of the operation refrigerator R at the present time. It is sequentially determined whether it is necessary.

  Then, when it is determined in this determination that a step increase is necessary, the combination K of the operating refrigerator R is defined as the actual threshold time point tss (see FIG. 6) with respect to the predicted threshold time point ts for the step increase. At the time tss, the stage is changed to the latest post-stage optimum combination Kx selected by the refrigerator selecting means 5C.

  Further, when it is determined that a step reduction is necessary in this determination, the combination K of the operating refrigerator R is set as the actual threshold time tss (see FIG. 9) with respect to the predicted threshold time ts for the step reduction. At the time tss, the stage is changed to the latest post-stage optimum combination Kx selected by the refrigerator selecting means 5C.

  In this combination change (ie, control of the number of refrigerators R according to the selected optimum combination Kx), when the step reduction prohibiting command is output from the refrigerator selecting means 5C, the step reduction prohibiting command is issued. No step-down is performed until it is released, and no step-up or step-down is performed until the setting prohibition time ΔTw elapses from the previous step-up or step-down.

  Further, in order to cope with a case where communication with the monitoring device 5 becomes impossible for some reason, the stage is increased or decreased in the absence of the output of the optimum combination Kx from the refrigerator selecting means 5C. Is required, each stage is increased or decreased in accordance with a preset increase order and a decrease order.

  f2. Control amount of each device (typically the flow rate of the cooling water pump PC, the flow rate of the primary pump PA, and the optimal control data table Dc (S) for each chilled water temperature, The set value of the machine outlet cold water temperature) is adjusted to the optimum control amount output by the optimum control amount setting means 5D.

  f3. The optimum control amount setting means 5D checks whether or not the designated change speed output for each control amount is appropriate for the current equipment operation state, and if it is appropriate, the optimum control amount setting means 5D outputs it. Adjust each controlled variable to the optimal controlled variable at the specified change speed.

  If the designated change speed output by the optimum control amount setting means 5D for each control quantity is inappropriate for the current equipment operation state, the designated change speed output by the optimum control amount setting means 5D Then, the control amount is adjusted to the optimum control amount at the corrected change speed.

  f4. When the new output of the optimum control amount from the optimum control amount setting means 5D is not over the set time so as to cope with the case where communication with the monitoring device 5 becomes impossible for some reason, An operation in which the control amount of each device is fixed to a set value (for example, the rated flow rate of the cooling water pump PC or the rated flow rate of the primary pump PA) is executed.

  f5. In the refrigerator selecting means 5C, as described above, it is possible to switch between the combination change by the optimum combination selection and the combination change of the priority formula, and the adoption of the combination change of the priority formula is selected. At that time, each increase or decrease of the stages is performed in accordance with the step increase order and the step decrease order preset for each refrigerator R.

In short, the heat source equipment control system of the present embodiment (see FIG. 10)
For each of the cases where the heat load Q, the outside air condition value (outside air wet bulb temperature tow), and the predetermined operating condition of the heat source equipment (combination K of the operating refrigerator R) are independent variables, and each of these independent variables changes. An optimal control data table D (which can cover the heat load Q at that time, and uses the energy consumption of the heat source facility as a target evaluation value and the optimal control amount of each device that minimizes the target evaluation value as a dependent variable. S) and
Operating condition selecting means (refrigerator selecting means 5C) for selecting the optimum content of the predetermined operating conditions at each time point (optimal combination Kx of the operating refrigerator R) using a predetermined selection model based on measurement information or command information;
In the optimum control data table D (S), the measured thermal load Q, the measured outside air state value (measured outside air wet bulb temperature tow) at each time point, and the optimum of the predetermined operating conditions selected by the operating condition selecting means (refrigerator selecting means 5C). Optimum control amount setting means 5D for reading out the optimum control amount of each device corresponding to the content (optimal combination Kx of the operating refrigerator R);
And a control means 6 for controlling a plurality of equipment components according to the optimum read control amount by the optimum control amount setting means 5D.
A load prediction means 5B for sequentially predicting the future thermal load Q,
The operating condition selection means (refrigerator selection means 5C) sequentially and repeatedly sets a new predetermined operation period X along with the sequential prediction of the thermal load Q by the load prediction means 5B.
For each of these new predetermined operation periods X, the content of the predetermined operation conditions (combination K of the operating refrigerator R) that can cover the heat load Q that changes every moment during the predetermined operation period X predicted by the load prediction means 5B, and The content of the predetermined operating condition (combination K of the operating refrigerator R) that minimizes the integrated value ΣE of the target evaluation value E that changes with the change of the thermal load Q in the predetermined operating period X is optimal for the predetermined operating condition. The configuration is selected as the content (optimal combination Kx of the operating refrigerator R),
Further, the operating condition selection means (refrigerator selection means 5C) changes the contents of the predetermined operating conditions (combination of the operating refrigerator R) based on the predicted thermal load Q along with the sequential prediction of the thermal load Q by the load prediction means 5B. Prediction threshold time points (ts) predicted to require (change) are sequentially and repeatedly determined, and for each determination of the prediction threshold time points ts, a predetermined operation period X having the prediction threshold time point (ts) as the period start time point is determined. It is configured to set.
The operating condition selecting means (refrigerator selecting means 5C) is configured to change the predetermined operating conditions (operating refrigerator R) after changing the contents based on the predicted thermal load Q by the load predicting means 5B for each setting of the predetermined operating period X. The predicted rethreshold time point (ts + Tx) predicted to require a change in content again for the combination K) is determined, and the predetermined operation period X is set with the predicted rethreshold time point (ts + Tx) as the end point of the period. is there.
Then, the control means 6 actually needs to change the content of the predetermined operating condition at present (combination K of the operating refrigerator R) based on the current thermal load Q obtained from the data related to the thermal load Q. The actual threshold time (tss) is determined, and the latest optimum content of the predetermined operating condition (the latest optimum combination of the operating refrigerator R) selected at that time for the equipment component equipment at the actual threshold time (tss). The control is performed according to (Kx).

[Another embodiment]
In the above embodiment, the control system aimed at minimizing the energy consumption E is shown, but instead of this, the operation cost Y is adopted as the target evaluation value to make the control system aimed at minimizing the operation cost Y. Alternatively, a converted carbon dioxide emission amount CO2 may be adopted as the target evaluation value to make a control system aimed at minimizing the converted carbon dioxide emission amount CO2.

  Further, a sum (for example, E × i + CO2 × j) of values obtained by multiplying at least two of the consumed energy E, the operating cost Y, and the converted carbon dioxide emission CO2 by a predetermined ratio i, j is set as the target evaluation value. A control system for minimizing at least two of the consumed energy E, the operating cost Y, and the converted carbon dioxide emission CO2 may be used.

  The outside air state value as one of the independent variables in the optimal control data table D (S) is not necessarily limited to the outside air wet bulb temperature tow, and may be the dry bulb temperature of the outside air, enthalpy, or the like. Each of the outside air state values may be an independent variable of the optimum control data table D (S).

  In the above-described embodiment, the example in which the combination of the operating refrigerators R (the refrigerator combination number K) is adopted as the predetermined operating condition of the heat source facility as one of the independent variables in the optimal control data table D (S), The predetermined operating conditions of the heat source equipment as the independent variables of the optimum control data table D (S) together with the thermal load Q and the outside air state value tow, and the optimum operating conditions for selecting the optimum contents by the operating condition selection means are the operational refrigeration The operation condition is not limited to the combination K of the machine R, and any operation condition may be used as long as the optimum content can be selected by the operation condition selection means using a predetermined selection model based on the measurement information or the command information. For example, the outlet cooling water temperature of the refrigerator R and the outlet cooling water temperature of the cooling tower CT are set as predetermined operating conditions as data table independent variables, and the optimum content selection of the predetermined operating conditions is selected. As may be selected by the operating condition selecting means by using a predetermined selection model based on the optimum value of the outlet coolant temperature thereof refrigerator outlet chilled water temperature and cooling tower CT of R measured information or command information.

  In the above-described embodiment, the example in which only the combination K of the operating refrigerator R is employed as the predetermined operation condition as the independent variable of the optimal control data table D (S) has been described, but together with the thermal load Q and the outside air state value tow A plurality of types of conditions are adopted as the predetermined operating conditions of the heat source equipment as the independent variables of the optimal control data table D (S), and the optimum contents at each time point are measured information or command information for each of the plurality of types of predetermined operating conditions. On the basis of this, a configuration may be adopted in which selection is made by the operating condition selection means using a predetermined selection model.

  The heat source device is not limited to a refrigerator, and may be a cold / hot water generator or a boiler, and the present invention can be applied to either a cold heat source facility or a warm heat source facility.

  The present invention can be applied to cold heat source equipment or hot heat source equipment for various uses.

R Heat source machine C Heat medium U Load device CT, PA to PC Equipment components Q Thermal load tow Outside air state value K Predetermined operating condition, combination of operating heat source machine Kx Optimal content, optimal combination of operating heat source machine E Target evaluation value D ( S) Optimal control data table 5C Operating condition selection means 5D Optimal control amount setting means 6 Control means X Predetermined operation period 5A Data table creation means 5E Evaluation means 5B Load prediction means ΣE Integrated value ts Predictive threshold time ts + Ts Predictive rethreshold time tss Actual Threshold

Claims (7)

In a heat source facility that supplies a heat medium cooled or heated by a heat source device to a load device, a heat source facility control system that controls a plurality of devices constituting the heat source facility according to the heat load of the load device,
The heat load, the outside air condition value, and the predetermined operating conditions of the heat source equipment are made independent variables, and when each of these independent variables changes, the heat load at that time can be covered, and the heat source equipment consumption Optimum control amount of each device that minimizes the target evaluation value with either the energy, the operating cost, the converted carbon dioxide emission amount or the sum of the values obtained by multiplying at least two of them by a predetermined ratio as the target evaluation value An optimal control data table with
An operation condition selecting means for selecting the optimum content of the predetermined operation condition at each time point using a predetermined selection model based on measurement information or command information;
Optimal control amount setting means for reading out the optimal control amount of each device corresponding to the measured thermal load at each time point, the measured outside air state value, and the optimum content of the predetermined operating condition selected by the operating condition selecting means in the optimal control data table When,
A control means for controlling the plurality of equipment components according to the optimum read control amount by the optimum control amount setting means,
Load prediction means for predicting future heat load sequentially,
The operation condition selection means sequentially and repeatedly sets a new predetermined operation period in accordance with the sequential prediction of the thermal load by the load prediction means,
For each of these new predetermined operating periods, the contents of the predetermined operating conditions that can cover the ever-changing thermal load during the predetermined operating period predicted by the load predicting means, and the target that changes as the thermal load changes The content of the predetermined operation condition that minimizes the integrated value in the predetermined operation period of the evaluation value is selected as the optimum content of the predetermined operation condition,
Further, the operating condition selection means sequentially and repeatedly determines a prediction threshold time point at which it is predicted that a change in the content of the predetermined operating condition is required based on the predicted thermal load with the sequential prediction of the thermal load by the load predicting means. And the heat source equipment control system which is set as the structure which sets the said predetermined | prescribed operation period which makes a prediction threshold time the period start time for every determination of these prediction threshold time.   The operation condition selection means predicts a re-threshold time point at which the content change is predicted again for the predetermined operation condition after the content change based on the predicted thermal load by the load prediction means for each setting of the predetermined operation period. The heat source equipment control system according to claim 1, wherein the predetermined operation period is set with the predicted rethreshold time as the end of the period.   The control means determines an actual threshold time point at which the content change is actually necessary for the content of the predetermined operating condition at the present time based on the current heat load obtained from the data related to the heat load, and at this actual threshold time point The heat source facility control system according to claim 1 or 2, wherein the facility component device is configured to be controlled according to the latest optimum content of the predetermined operating condition selected at that time.   The heat source equipment control system according to any one of claims 1 to 3, further comprising data table creation means for automatically creating the optimum control data table by simulating heat source equipment operation based on equipment data of the equipment constituting equipment. .   The data table creation means includes operating data obtained by simulating heat source equipment operation based on equipment data of the equipment constituting equipment, and operating data obtained by actual heat source equipment operation in which the equipment constituting equipment is controlled by the control means. The heat source equipment control system according to claim 4, wherein the optimum control data table is automatically corrected based on the data difference.   The target evaluation value when the equipment component device is controlled according to the optimum read control amount by the optimum control amount setting means, and the target evaluation when the equipment component device is controlled according to the thermal load by another operation control method The heat source equipment control system according to any one of claims 1 to 5, further comprising an evaluation means for comparing the values. The optimum control data table has the thermal load, the outside air state value, and a plurality of types of predetermined operating conditions as independent variables,
The operation condition selecting means is configured to select an optimum content at each time point for each of the plurality of types of predetermined operation conditions using a predetermined selection model based on measurement information or command information. The heat source equipment control system according to claim 1.

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