JP4838776B2 - Heat source control device and heat source control method - Google Patents

Description

  The present invention relates to a heat source control device and a heat source control method for controlling the operation of a heat source such as a refrigerator or a heater.

  Conventionally, in tenant buildings, etc., a heat source system having a plurality of heat sources and a pump provided as an auxiliary machine for each of these heat sources as a main component has been provided, and the heat medium pumped from the pump is cooled or heated by the heat source. These are mixed in the forward header and supplied to an external device such as an air conditioner or a fan coil unit through the forward water pipeline. The heat medium subjected to heat exchange in the load device is returned to the return header through the return water pipe, is pumped again by the pump, and circulates through the above path. For example, when the heat source is a refrigerator, the heat medium is cold water and circulates through the above-described path. When the heat source is a heater, the heat medium is warm water and circulates through the above-described path (for example, see Patent Document 1).

  The heat source system is provided with a heat source control device that controls the operation of the heat source. The heat source control device measures the flow rate (load flow rate) F of the heat medium returned to the return header, and controls the operation (start / stop) of the heat source according to the measured load flow rate F. Alternatively, from the temperature of the heat medium sent from the forward header (outward water temperature) TS, the temperature of the heat medium returned to the return header (return water temperature) TR, and the flow rate of the heat medium returned to the return header (load flow rate) F , F × (TR−TS) × specific heat = Q, the load heat quantity Q is obtained, and the operation (start / stop) of the heat source is controlled according to the obtained load heat quantity Q.

  For example, according to a predetermined operation sequence pattern, the heat source of the designated rank 1 is operated until the load heat quantity Q reaches a predetermined value Q1, and if the load heat quantity Q exceeds the predetermined value Q1, the heat source of the designated rank 1 In addition to this, the operation of the heat source of the designated rank 2 is started. Thereafter, when the load heat quantity Q becomes equal to or less than a predetermined value Q1 '(Q1' <Q1), the operation of the heat source unit of the designated rank 2 is stopped. When the operation of the heat source is started, the operation of the pump that is an auxiliary machine of the heat source is also started. If the operation of the heat source is stopped, the operation of the pump that is an auxiliary machine of the heat source is also stopped.

  Normally, buildings such as office buildings have a large load at night and daytime, so the operation sequence pattern is set for nighttime and daytime in order to reduce power consumption as much as possible and to operate the heat source optimally. They are defined separately.

  For example, the time zone of “8:00 to 22:00” is daytime, the time zone of “22:00 to 8:00” is nighttime, and the absorption refrigerator is ranked first in the daytime zone (starting rank) 1) The turbo refrigerator is in the second rank (starting rank 2), the turbo chiller is in the first rank (starting rank 1), and the absorption refrigerator is in the second rank (starting rank 2) in the night time zone. .

  That is, a daytime driving order pattern (daytime pattern) and a nighttime driving order pattern (nighttime pattern) are prepared, and when the current time is 8:00, the driving order pattern to be used is switched from the nighttime pattern to the daytime pattern, When the current time is 22:00, the operation sequence pattern to be used is switched from the day pattern to the night pattern.

Japanese Patent Laid-Open No. 2000-18684

  However, in the conventional operation order pattern switching method, when the current time is 8:00, the operation order pattern is immediately switched from the night pattern to the day pattern regardless of the load. The machine is stopped and the absorption chiller is started instead, and the water supply temperature rises until the absorption chiller starts up, deteriorating the indoor environment. In addition, due to the rise in water supply temperature, there was a problem that an additional stage of the refrigerator occurred and the energy consumption increased.

  The present invention has been made to solve such a problem, and the object of the present invention is to switch the operation order pattern without deteriorating the indoor environment and increasing the energy consumption. An object of the present invention is to provide a heat source control device and a heat source control method.

  In order to achieve such an object, the first invention (the invention according to claim 1) includes a first operation sequence pattern and a second operation sequence pattern that define the operation sequence of the heat source according to the load. In the heat source control device that switches the operation sequence pattern that uses the predetermined switching time as the boundary from the first operation sequence pattern to the second operation sequence pattern, the operation that maintains the operation of the heat source that is operating at the switching time A heat source starting means for starting from a stopped heat source having a high starting order in the second operation order pattern when the holding means and the capacity of the heat source whose operation is held by the operation holding means can no longer cover the load; A combination of a heat source whose operation is held by the operation holding means and a heat source activated by the heat source activation means is monitored, and this combination is a second operation sequence pattern. At the time when a combination in accordance with the load follow is obtained by providing a pattern switching means for switching the operation sequence pattern used for the second operating sequence pattern.

  For example, in the present invention, when the first driving order pattern is the night pattern, the second driving order pattern is the day pattern, and the switching time is 8:00, the driving is performed according to the night pattern when the current time is 8:00. The operation of the existing heat source is maintained. For example, if the turbo refrigerator is in operation, the operation of the turbo refrigerator is maintained. And when it becomes impossible to cover a load with the capacity | capacitance of this hold | maintained turbo refrigerator, it starts from the heat source in a stop with a high starting order in a daytime pattern. For example, if the stopping heat source having the highest starting order in the daytime pattern is an absorption refrigerator, the absorption refrigerator is started. If the load cannot be covered even by the operation of the absorption chiller, the heat source of the next startup order that is stopped in the daytime pattern is started.

  The pattern switching means monitors the combination of the heat source in which the operation is held and the activated heat source, and switches the operation sequence pattern to be used to the day pattern when the combination becomes a combination according to the load according to the day pattern. . For example, when a combination of one turbo refrigerator and two absorption refrigerators is obtained, the operation sequence pattern to be used is switched to the day pattern. Thereby, the switching from the night pattern to the day pattern is performed without stopping the turbo chiller operated in the night pattern, and an increase in the water supply temperature is suppressed.

  In the present invention, after reaching the switching time from the first operation order pattern to the second operation order pattern, the combination of the heat source that has been operated and the heat source that has been activated will depend on the load according to the daytime pattern. It is assumed that it will not be a combination. Assuming such a case, in the second invention (the invention according to claim 1), even when the predetermined forced switching time is reached, the operation order pattern is not switched by the pattern switching means. Pattern forced switching means for forcibly switching the operation sequence pattern to be used to the second operation sequence pattern is provided. Thereby, for example, when the forced switching time is set to 11:00, if the operation order pattern is not switched even when 11:00 is reached, the forced switching time is forcibly switched to the daytime pattern.

  The present invention can be realized not only as a heat source control device but also as a heat source control method. The invention according to claim 3 (third invention) is the heat source control device of the first invention realized as a heat source control method, and the invention according to claim 4 (fourth invention) is the heat source control of the second invention. The apparatus is realized as a heat source control method.

  According to the present invention, the operation of the heat source in operation is held at the switching time from the first operation order pattern to the second operation order pattern, and the load cannot be covered by the capacity of the heat source in which the operation is held. In this case, the second operation sequence pattern is activated from a heat source in a stopped state having a high activation sequence, and the combination of the heat source that has been operated and the activated heat source is monitored, and this combination is the second operation sequence pattern. Since the operation sequence pattern to be used is switched to the second operation sequence pattern when the combination according to the load conforming to the above is satisfied, the heat source operated in the first operation sequence pattern is stopped without stopping. It becomes possible to switch from the first operation sequence pattern to the second operation sequence pattern, to suppress an increase in the water supply temperature, and to prevent deterioration of the indoor environment. It is possible to become. Moreover, it is possible to prevent an increase in energy consumption without increasing the heat source due to an increase in the water supply temperature.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an instrumentation diagram showing a main part of an embodiment of a heat source system using a heat source control device according to the present invention.

  In FIG. 1, 1-1 and 1-2 are turbo refrigerators, 2-1 and 2-2 are absorption refrigerators, and P1 and P2 are circulation paths for cold water generated by the turbo refrigerators 1-1 and 1-2. P3 and P4 are pumps provided for each individual as auxiliary machines, P3 and P4 are pumps provided as auxiliary machines in the circulation passage of the cold water generated by the absorption chillers 2-1 and 2-2, 3 is a centrifugal chiller 1 -1, 1-2 and the forward header which mixes the cold water from the absorption refrigerators 2-1 and 2-2, 4 is sent from the forward header 3 through the forward pipeline 4 An external device such as an air conditioner or a fan coil that receives supply of cold water, 6 is a flow rate adjustment valve that adjusts the amount of cold water flowing into the external device 5, and 7 is a return water pipe.

  8 is a return header in which the cold water sent through the return water pipe 7 is exchanged by heat exchange in the external device 5, 9 is a bypass pipe that connects the forward header 3 and the return header 8, and 10 is from the forward header 3. A water supply temperature sensor that measures the temperature of the cold water to the external device 5 as the water supply temperature TS, 11 is a return water temperature sensor that measures the temperature of the cold water returned to the return header 8 as the return water temperature TR, and 12 is returned to the return header 8. A flow meter 13 for measuring the flow rate (load flow rate) F of the cold water to be generated is a heat source control device according to the present invention.

  In this heat source system, the water fed by the pumps P1 to P4 is converted into cold water by the turbo chillers 1-1 and 1-2 and the absorption chillers 2-1 and 2-2, and mixed in the forward header 3. It is supplied to the external device 5 through the outgoing water pipeline 4. And it heat-exchanges in the external apparatus 5, is returned to the return header 8 via the return water pipe 7, is pumped by the pumps P1-P4 again, and circulates the above path | route.

  The heat source control device 13 controls the operation (start / stop) of the turbo chillers 1-1 and 1-2 and the absorption chillers 2-1 and 2-2 according to the load flow rate F from the flow meter 12. . Alternatively, from the water supply temperature TS from the water supply temperature sensor 10 and the return water temperature TR from the return water temperature sensor 11, the load heat quantity Q is obtained as F × (TR−TS) × specific heat = Q, and the obtained load heat quantity is obtained. The operation (start / stop) of the turbo chillers 1-1 and 1-2 and the absorption chillers 2-1 and 2-2 is controlled according to Q.

  If the turbo chillers 1-1 and 1-2 are started / stopped, the pumps P1 and P2 are also started / stopped in conjunction with this. Further, if the absorption chillers 2-1 and 2-2 are started / stopped, the pumps P3 and P4 are also started / stopped in conjunction with this.

  In the present embodiment, the rated capacity of the turbo chiller 1 (1-1, 1-2) is 100 RT, and the rated capacity of the absorption chiller 2 (2-1, 2-2) is 200 RT. The turbo refrigerator 1 uses electricity as an energy source, and the absorption refrigerator 2 uses gas as an energy source.

  FIG. 2 shows an outline of the hardware configuration of the heat source control device 13. In the figure, 13A is a CPU, 13B is a RAM, 13C is a storage device, and 13D and 13E are interfaces. The CPU 13A operates according to a program stored in the storage device 13C while obtaining input information such as the water supply temperature TS, the return water temperature TR, and the load flow rate F given through the interface 13D and accessing the RAM 13B.

  The storage device 13C has an operation sequence pattern switching program for switching the start order of the daytime and nighttime of the turbo chillers 1-1 and 1-2 and the absorption chillers 2-1 and 2-2 as a program unique to the present embodiment. Stored. This operation sequence pattern switching program is provided in a state where it is recorded on a recording medium such as a CD-ROM, for example, and is read from this recording medium and installed in the storage device 13C.

  In addition, in the storage device 13C, in relation to the above operation sequence pattern switching program, as a table for determining the starting order of the turbo chillers 1-1 and 1-2 and the absorption chillers 2-1 and 2-2, An operation sequence pattern for daytime (daytime pattern) and an operation sequence pattern for nighttime (nighttime pattern) are set. Also, the switching time from the night pattern to the day pattern is set as “8:00”, and the switching time from the day pattern to the night pattern is set as “22:00”. In addition, the forced switching time from the night pattern to the day pattern is set as “11:00”.

  FIG. 3 shows an example of a day pattern and a night pattern. In this example, in the daytime pattern, the absorption chillers 2-1 and 2-2 having a rated capacity of 200 RT are set as the starting ranks 1 and 2, and the turbo chillers 1-1 and 1-2 having a rated capacity of 100 RT are set. It is set as activation order 3 and 4. In the night pattern, turbo chillers 1-1 and 1-2 with a rated capacity of 100 RT are set as starting ranks 1 and 2, and absorption chillers 2-1 and 2-2 with a rated capacity of 200 RT are set as starting rank 3. 4 is set. In the daytime pattern and the nighttime pattern, the same type of heat source is automatically rotated, so the starting order in parentheses may be used. Hereinafter, the description will be continued assuming that the day pattern and the night pattern are set.

  If the operation of the turbo chillers 1-1 and 1-2 and the absorption chillers 2-1 and 2-2 is controlled according to the day pattern and the night pattern, the turbo chillers are set to group 1, and the absorption refrigeration is performed. When the machine is group 2, the number of operating units (combination of heat sources) is as shown in FIG. 4 during the day due to the load, and the number of operating units (combination of heat sources) is as shown in FIG. 5 at night.

  Hereinafter, an example of the processing operation of the CPU 13A according to the above-described operation order pattern switching program will be described with reference to the flowchart shown in FIG. In this example, it is assumed that only the turbo chiller 1-1 is operated as a state immediately before the switching time from the night pattern to the day pattern starts.

  In this case, when the current time is the switching time from the night pattern to the daytime pattern (8:00) according to the operation control program (YES in step S101, point t1 shown in FIG. 7), the CPU 13A operates the heat source during operation. Is held (step S102). In this case, since only the turbo chiller 1-1 is operated, the operation of the turbo chiller 1-1 is maintained.

  Then, it is checked whether there is a stage increaser due to a load increase (step S103), and if there is not a stage decreaser due to a load decrease (step S105), both the stage increaser and the stage reduction machine are checked. If not, the process returns to step S103 in response to NO in step S109, and the check of the step-up machine due to the load increase and the step-down machine due to the load reduction is repeated.

  Here, when the load increases and becomes 100 RT or more, which is the rated capacity of the turbo chiller 1-1 (point t2 shown in FIG. 7), it is determined that there is a stage increaser due to the load increase (YES in step S103). The held operating machine is left as it is, and the stopped heat source having the highest starting order among the operation order patterns after switching, that is, the daytime patterns, is started. In this case, the absorption refrigerator 2-1 is started.

  As a result, the operation state of the heat source is the two units of the turbo chiller 1-1 and the absorption chiller 2-1, and the turbo chiller 1-1 can cover the load of 100RT, and the absorption chiller 2- 1 can cover a load of 200 RT, and a total load of 300 RT can be covered.

  Here, the CPU 13A checks whether or not the two-unit operation of the turbo chiller 1-1 and the absorption chiller 2-1 is according to the daytime pattern (step S107). That is, the combination of the turbo chiller 1-1 and the absorption chiller 2-1 can cover a load of 300 RT, and whether this combination is the same as the combination of heat sources in the case of 300 RT in the daytime pattern. Check.

  In this case, since the combination of heat sources in the case of 300 RT in the daytime pattern is two absorption refrigerators as can be seen from FIG. 4, the combination is different. Therefore, in step S107, it is not determined that the operation is in accordance with the daytime pattern, and in response to NO in step S109, the process returns to step S103, and the check of the step increaser due to load increase and the step decrease due to load decrease is repeated.

  If the load decreases and falls below 200 RT during the repetition of this check, it is determined that there is a step-down machine due to the load reduction (YES in step S105), and the retained operating machine is left as it is, the daytime pattern. The heat source in operation with the lowest starting order is stopped. In this case, the operation of the absorption chiller 2-1 is stopped.

  During the repetition of this check, when the load increases and becomes 300 RT or more (point t3 shown in FIG. 7), it is determined that there is a stage increaser due to the load increase (YES in step S103), As it is, the stopped heat source having the highest start order in the daytime pattern is started. In this case, the turbo refrigerator 1-1 is started.

  As a result, the operating state of the heat source becomes the operation of three units of the turbo chiller 1-1 and the absorption chillers 2-1 and 2-2, and the turbo chiller 1-1 can cover the load of 100 RT. The refrigerators 2-1 and 2-2 can cover a load of 400 RT, and can cover a total load of 500 RT.

  Here, the CPU 13A checks whether or not the three-unit operation of the turbo chiller 1-1 and the absorption chillers 2-1 and 2-2 is according to the daytime pattern (step S107). That is, the combination of the turbo refrigerator 1-1 and the absorption refrigerators 2-1 and 2-2 can cover a load of 500 RT, and this combination is the same as the combination of heat sources in the case of 500 RT in the daytime pattern. Check if it exists.

  In this case, since the combination of heat sources in the case of 500 RT in the daytime pattern is one turbo refrigerator and two absorption refrigerators as can be seen from FIG. 4, the combination is the same. Therefore, in step S107, it is determined that the operation is in accordance with the daytime pattern. In this case, it progresses to step S108 and switches the driving | operation order pattern to be used to a daytime pattern. Thereafter, the operation of the turbo chillers 1-1 and 1-2 and the absorption chillers 2-1 and 2-1 is controlled according to the switched daytime pattern.

  As can be seen from the above description, according to the present embodiment, the switching from the night pattern to the day pattern is performed without stopping the start of the turbo chiller 1-1 operated in the night pattern. An increase in the water supply temperature (cold water temperature) is suppressed, and the indoor environment is not deteriorated. In addition, the heat source is not increased due to an increase in the water supply temperature, and an increase in energy consumption is prevented.

  In step S107, if the operation according to the daytime pattern is not confirmed indefinitely, that is, if the load does not increase and the state of less than 300 RT continues, the forced switching time from the night pattern to the daytime pattern is reached. At a certain time “11:00” (YES in step S109), the driving order pattern is forcibly switched to the daytime pattern (step S110).

  In the above-described embodiment, a case where a turbo refrigerator and an absorption refrigerator are used as the refrigerator has been described. However, the refrigerator to be used is not limited to a turbo refrigerator or an absorption refrigerator. Moreover, although the example which uses a refrigerator as a heat source demonstrated, when using a heater, it can apply similarly.

  For reference, FIG. 8 shows a functional block diagram of a main part of the heat source control device 13 in the above-described embodiment. The heat source control device 13 includes operation order pattern switching means 14. The operation sequence pattern switching means 14 has an operation holding means 14A for holding a heat source in operation at the switching time from the night pattern to the day pattern set in the storage device 13C, and the operation holding means 14A holds the operation. When it becomes impossible to cover the load with the capability of the heat source, the heat source starting means 14B that starts from a stopped heat source with a high starting order in the daytime pattern, and the heat source and the heat source starting means 14B that are held by the operation holding means 14A And a pattern switching unit 14C that switches the operation sequence pattern to be used to the daytime pattern when the combination of the heat sources activated by is monitored and the combination becomes a combination according to the load according to the daytime pattern. The operation sequence pattern switching means 14 is realized as a processing function of the CPU 13A.

It is an instrumentation figure which shows the principal part of one Embodiment of the heat-source system using the heat-source control apparatus which concerns on this invention. It is a figure which shows the outline of the hardware constitutions of the heat source control apparatus in this heat source system. It is a figure which illustrates the driving | operation order pattern (daytime pattern, night pattern) used in this heat source system. It is a figure which shows the combination of the heat source according to the load according to a daytime pattern. It is a figure which shows the combination of the heat source according to the load according to a night pattern. It is a flowchart for demonstrating the processing operation according to the driving | operation order pattern switching program which CPU of a heat source control apparatus performs. It is a time chart for demonstrating an example of the processing operation according to an operation control program. It is a functional block diagram which shows the function of the principal part of a heat source control apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 (1-1, 1-2) ... Turbo refrigerator, 2 (2-1, 2-2) ... Absorption type refrigerator, P1-P4 ... Pump, 3 ... Out header, 4 ... Out water pipeline, 5 ... External equipment, 6 ... Flow control valve, 7 ... Return water pipe, 8 ... Return header, 9 ... Bypass pipe, 10 ... Water supply temperature sensor, 11 ... Return water temperature sensor, 12 ... Flow meter, 13 ... Heat source control device, 13A ... CPU, 13B ... RAM, 13C ... storage device, 13D, 13E ... interface, 14 ... operation order pattern switching means, 14A ... operation holding means, 14B ... heat source starting means, 14C ... pattern switching means.

Claims (4)

A first operation order pattern and a second operation order pattern that determine the activation order of the heat source are provided, and an operation order pattern that is used with a predetermined switching time as a boundary is changed from the first operation order pattern to the second operation order pattern. In the heat source control device that switches to the operation sequence pattern of
Operation holding means for holding the operation of the heat source in operation at the switching time;
A heat source starting means for starting from a stopped heat source having a high start order in the second operation order pattern when the load of the heat source whose operation is held by the operation holding means cannot be covered;
The combination of the heat source whose operation is held by the operation holding means and the combination of the heat sources activated by the heat source activation means is monitored, and when this combination becomes a combination according to the load according to the second operation sequence pattern, it is used A heat source control device comprising: pattern switching means for switching the operation sequence pattern to be switched to the second operation sequence pattern. In the heat source control device according to claim 1,
Pattern forced switching for forcibly switching the operation sequence pattern to be used to the second operation sequence pattern when the pattern switching means does not switch the operation sequence pattern even when a predetermined forced switching time is reached A heat source control device comprising: means. A first operation order pattern and a second operation order pattern that determine the activation order of the heat source are provided, and an operation order pattern that uses a predetermined switching time as a boundary is changed from the first operation order pattern to the second operation order pattern. In the heat source control method for switching to the operation sequence pattern of
A first step of maintaining operation of the heat source in operation at the switching time;
A second step of starting from a stopped heat source having a high start-up order in the second operation order pattern when the load of the heat source that has been kept in operation by the first step cannot be covered;
The combination of the heat source whose operation is maintained by the first step and the heat source activated by the second step is monitored, and when this combination becomes a combination according to the load according to the second operation sequence pattern, the combination is used. A heat source control method comprising: a third step of switching the operation sequence pattern to be switched to the second operation sequence pattern. In the heat source control method according to claim 3,
If the operation order pattern is not switched in the three steps even when a predetermined forced switching time is reached, a fourth step for forcibly switching the operation order pattern to be used to the second operation order pattern is performed. A heat source control method comprising:

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