JP2018004179A - Heat source system, method for controlling heat source system and program for controlling heat source system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source system that can conduct change control for a heat source machine depending on a system electric power consumption and proper return control, and to provide a method for controlling a heat source system and a program for controlling a heat source system.SOLUTION: A heat source system 1 includes: a plurality of heat source machines; and a heat source control device 50 for controlling the source machines. The heat source control device 50 starts a turbo refrigerator 10 and then stops an absorption refrigerator 20 when the heat source system 1 has thermal load that is equal to or lower than a thermal load threshold value while the turbo refrigerator 10 is in a stop state and the absorption refrigerator 20 that has lower electric power consumption than the turbo refrigerator 10 has started up.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat source system, a control method for the heat source system, and a control program for the heat source system, and more specifically, a heat source system for performing replacement control and appropriate return control of a heat source unit according to system power consumption and control of the heat source system. The present invention relates to a method and a control program for a heat source system.

Conventionally, in an air conditioning system, it has been proposed to perform demand control so that the power consumption of the air conditioning system does not exceed the contracted power with the power company (hereinafter referred to as “demand limit value”). In order to suppress the amount of power demand for demand control, for example, system power consumption, which is power consumed by the heat source system, is reduced.
The following methods have been proposed as a method for reducing system power consumption in the heat source system. When the heat source system is composed of a heat source unit that consumes more power than the heat source unit and a heat source unit that consumes less power than the heat source unit, distribute the load of the heat source unit that consumes more power when demand control is performed. In addition, it is a method of allocating a large amount of load of the heat source device with low power consumption.

  For example, in Patent Document 1, the operation of a plurality of electric heat source devices (heat source devices with high power consumption) is stopped while being sequentially shifted before a peak cut time zone for suppressing power consumption in a time zone corresponding to the peak of power demand. At the same time, the operation of multiple fuel system heat source devices (heat source devices with low power consumption) is switched so as to start while sequentially shifting, and the increase in the temperature of the heat source water temperature supplied to external devices is suppressed, thereby significantly deteriorating the indoor environment. There is disclosed a heat source replacement control method that prevents the occurrence of the problem.

In demand control, a method for controlling a water supply set temperature, which is a set temperature of heat source water supplied from a heat source device to an external device, has been proposed so that system power consumption does not exceed a demand limit value.
For example, Patent Document 2 discloses that when the system power consumption exceeds a threshold set to a value lower than the demand limit value, the water supply set temperature is increased in a direction in which the power consumption of the heat source device decreases. .

Japanese Patent No. 5140341 JP 2013-210149 A

However, in the invention disclosed in Patent Document 1, since the time zone for exchanging the heat source device is set as the peak cut time zone in advance, even if it is not necessary to reduce the system power consumption, it is compulsory if it is the peak cut time zone. In addition, there is a problem in that a heat source device with low power consumption is replaced with a heat source device with low power consumption, and the heat source device with low power consumption is preferentially operated.
Further, when the invention disclosed in Patent Document 2 is applied to the case where control is performed according to the system power consumption when returning the replaced heat source unit, the system power consumption due to the replacement of the heat source unit is discontinuous. Therefore, there is a possibility that the demand limit value may be exceeded when the value is restored.

  The present invention has been made in view of such circumstances, and a heat source system, a heat source system control method, and a heat source system capable of performing replacement control and appropriate return control of a heat source unit according to system power consumption. The purpose is to provide a control program.

In order to solve the above problems, the heat source system, the heat source system control method, and the heat source system control program of the present invention employ the following means.
A heat source system according to a first aspect of the present invention is a heat source system comprising a plurality of heat source units and a control device that controls the heat source unit, wherein the control device has the first heat source unit stopped. And when the 2nd heat source machine whose power consumption is smaller than the 1st heat source machine is starting, if the heat load of the heat source system is below a heat load threshold, the 1st heat source machine is started, and then The second heat source machine is stopped.

When a heat source system with different power consumption is provided in the heat source system, usually a heat source machine with high power consumption (for example, a turbo chiller) is started, and a heat source machine with low power consumption (for example, an absorption chiller) is stopped. Yes. Here, when the system power consumption of the heat source system increases and approaches the demand limit value, the heat source unit with low power consumption is activated and the heat source unit with high power consumption is stopped so as not to exceed the demand limit value. Whether or not to return to the normal operation state from the state in which the heat source machine is replaced in this way is determined based on the heat load of the heat source system.
According to this configuration, in such determination of return control, return control can be performed at an appropriate timing by using the heat load of the heat source system that does not change depending on the activated heat source unit.
In addition, since the first heat source machine (for example, the centrifugal chiller) is started and the second heat source machine (for example, the absorption chiller) is stopped, the supply temperature to the external device connected to the heat source system is deteriorated (by cold water supply). If there is, it can be prevented from rising, and if hot water is supplied, it can be prevented from falling).
Here, the thermal load threshold is a thermal load threshold that is set to determine whether or not the thermal load that does not change depending on the activated heat source device can be sufficiently lowered and returned to the normal operation state. is there.

  In the first aspect, when the first heat source machine is stopped and the second heat source machine is activated, the control device has the heat load of the heat source system equal to or lower than the heat load threshold, If it is assumed that one heat source machine is started and then one second heat source machine is stopped, and the load factor of the first heat source machine is equal to or greater than a load factor threshold, the first heat source machine is set to 1 If the heat load of the heat source system is 100% or less when it is assumed that the stand is activated and / or one of the second heat source devices is stopped, the second heat source device may be stopped. preferable.

According to this configuration, when it is assumed that one heat source machine is started and one second heat source machine is stopped when the heat source machine is returned to the normal operation state from the exchanged state, the first heat source machine is If the load factor is equal to or higher than the threshold value, that is, if the first heat source device does not enter a low load state, one first heat source device is activated. Next, when it is assumed that one second heat source machine is stopped, the heat load of the heat source system is 100% or less, that is, even if one second heat source machine is stopped, If all can be shared, one second heat source machine is stopped.
For example, when the rated capacity varies depending on each heat source machine, starting the first heat source machine by the number of first heat source machines stopped last time, and stopping the second heat source machine by the number of second heat source machines started last time, Due to the difference in capacity, the first heat source machine becomes in a low load state and “the activated first heat source machine stops again” or the activated heat source machine cannot cover the heat load of the heat source system. There is a possibility of starting again. In response to the possibility of such a useless start and stop of the heat source machine, the start of the first heat source machine and the stop of the second heat source machine are considered in consideration of the ability and heat load of the heat source machine to be started and stopped next. Determine whether it is necessary.
Thereby, useless start / stop of the heat source device such as restart of the activated heat source device or restart of the stopped heat source device is not caused.
Here, the load factor threshold is a threshold of the load factor provided so as not to stop when the load factor of the heat source unit is excessively lowered, and is a value set to a value larger than the load factor at which the heat source unit stops. It is.

  In the first aspect, the control device, when the first heat source machine is activated and the second heat source machine is stopped, if the system power consumption of the heat source system is equal to or greater than a first power threshold, It is preferable to start all the second heat source units and subsequently stop all the first heat source units.

According to this configuration, since the heat source system replaces the heat source unit from the normal operation state according to the system power consumption, replacement control according to the actual dynamics of the heat source system can be performed. Further, it is possible to avoid the possibility that the demand limit value will be exceeded without replacing the heat source device even though it is necessary to reduce the system power consumption. For example, if the heat source replacement control is forcibly performed every time period, the heat source replacement is performed even if it is not necessary to reduce the system power consumption. Highly efficient control can be performed without giving priority to the heat source unit that is controlled and has low efficiency.
In addition, since the second heat source machine (for example, absorption chiller) is started and the first heat source machine (for example, turbo chiller) is stopped, it is connected to the heat source system by the second heat source machine that takes time from the start to the performance. It is possible to prevent deterioration of the supply temperature to the external equipment.
Here, the system power consumption indicates power consumption in the heat source system.
The first power threshold value of the system power consumption is a value set to a value lower than the demand limit value so that the system power consumption does not exceed the demand limit value.

  In the first aspect, when the first heat source unit is activated and the second heat source unit is stopped, the control device has the system power consumption of the heat source system equal to or higher than the first power threshold. Each time, it is preferable to start one of the second heat source machines and then stop one of the first heat source machines.

According to this configuration, since the heat source devices are replaced one by one from the normal operation state according to the system power consumption, the system power consumption is prevented from exceeding the demand limit value, and at the same time, the efficiency is too low. Can be avoided.
If the replacement from the high efficiency heat source unit to the low efficiency heat source unit is performed more than necessary, the heat source system will be operated with low efficiency. Decreasing efficiency can be suppressed by changing the number of heat source units to low efficiency one by one.

  In the first aspect, when the system power consumption of the heat source system is equal to or greater than a second power threshold, the control device has a water supply set temperature that is a set temperature of heat source water supplied from the heat source unit to an external device. If the system power consumption of the heat source system is less than a third power threshold, the increase of the water supply set temperature is terminated, and the first power threshold is equal to the second power threshold and the third power threshold. Are different values, and the third power threshold is preferably equal to or less than the second power threshold.

According to this configuration, in addition to the heat source unit replacement control according to the system power consumption of the heat source system described above, control of the water supply set temperature, which is the set temperature of the heat source water supplied from the heat source unit to the external device, is performed. Depending on. Here, the threshold values of the system power consumption of the heat source system are set to different values so that the replacement control of the heat source machine and the control of the water supply set temperature are not performed at the same timing.
Thereby, the effect which suppresses the system power consumption of a heat source system can further be heightened.
Here, the second power threshold is a value set to a value lower than the demand limit value so that the system power consumption does not exceed the demand limit value in the control of the water supply set temperature. The third power threshold is preferably a value equal to or lower than the second power threshold, but the same value as the second power threshold may be set.

  In the first aspect, it is preferable that the thermal load threshold is determined based on the thermal load of the heat source system at the time when the system power consumption of the immediately preceding heat source system becomes equal to or higher than the first power threshold.

  According to this configuration, since the threshold value of the heat load is determined based on the heat load at the time when the replacement control of the immediately preceding heat source apparatus is performed, the control is performed according to the heat load at the time of each replacement. For example, it is assumed that the thermal load threshold is α% (α <100) of the thermal load at the time when the replacement control of the immediately preceding heat source unit is performed. It can be said that the system power consumption required for this is also reduced because the heat load is sufficiently lower than when the heat source machine replacement control is performed. That is, since it can be determined that the system power consumption does not exceed the demand limit value, it is possible to return to a normal operation state with high efficiency. α% is set so that the heat load does not reach the heat load at the time when the replacement control of the immediately preceding heat source unit is performed in consideration of the fluctuation range of the heat load, for example, 80 to 90% is set. The

  The heat source system control method according to the second aspect of the present invention is a heat source system comprising a plurality of heat source units and a control device that controls the heat source unit, wherein the first heat source unit stops and the first heat source If the heat load of the heat source system is less than or equal to the heat load threshold when the second heat source machine that consumes less power than the machine is activated, all the first heat source machines are activated, and then the second heat source Control to stop all machines.

  A control program for a heat source system according to a third aspect of the present invention is a heat source system comprising a plurality of heat source units and a control device that controls the heat source unit, wherein the first heat source unit stops and the first heat source If the heat load of the heat source system is less than or equal to the heat load threshold when the second heat source machine that consumes less power than the machine is activated, all the first heat source machines are activated, and then the second heat source A process of performing control to stop all the machines.

According to the present invention, since the return control is determined using the heat load that does not change depending on the type of the heat source device, it is possible to perform an appropriate return control after the heat source device is replaced.
Further, according to the present invention, the replacement is performed from the normal operation state according to the system power consumption, so that it is possible to perform the replacement control of the heat source machine in accordance with the actual state of the heat source system.

It is the schematic block diagram which showed the heat source system of this invention. It is the flowchart which showed control of the heat-source system which concerns on 1st Embodiment of this invention. It is the figure which showed the operation state of each heat source machine of the heat source system as the 1st reference example of this invention. It is the figure which showed the driving | running state of each heat-source machine of the heat-source system as the 2nd reference example of this invention. It is the flowchart which showed control of the heat-source system which concerns on 2nd Embodiment of this invention. It is the flowchart which showed control of the heat-source system which concerns on 3rd Embodiment of this invention. It is the flowchart which showed control of the heat-source system which concerns on 4th Embodiment of this invention.

Embodiments of a heat source system, a heat source system control method, and a heat source system control program according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a schematic configuration of a heat source system, a heat source system control method, and a heat source system control program according to the present embodiment.
As shown in FIG. 1, the heat source system 1 includes three turbo chillers (first heat source machines) 10a, 10b, and 10c, two absorption chillers (second heat source machines) 20a and 20b, and a heat source. A control device 50 and an external device 80 are provided as main components. In FIG. 1, the case where three turbo chillers 10a, 10b and 10c and two absorption chillers 20a and 20b are installed is illustrated, but the number of each installed is determined arbitrarily. Can do.
In the following description, when distinguishing each turbo refrigerator 10, either a, b, or c is added to the end, and when not distinguishing each turbo refrigerator 10, a, b, or c is omitted. Moreover, when distinguishing each absorption refrigerator 20, either a or b is attached | subjected to the end, and when not distinguishing each absorption refrigerator 20, a or b is abbreviate | omitted.

The external device 80 is, for example, an air conditioning facility, a hot water supply facility, a factory facility, or the like. The turbo refrigerator 10 and the absorption refrigerator 20 cool or heat the heat source water based on the set temperature set by the heat source control device 50, and supply the heat source water after cooling or after heating to the external device 80. Here, the heat source water may be a liquid medium other than water.
In the present embodiment, for convenience of explanation, an air conditioning facility that performs a cooling operation is assumed as the external device 80, the water that is the heat source water is cooled in the turbo chiller 10 and the absorption chiller 20, and the cooled chilled water is supplied to the outside. The case of supplying to the device 80 will be described as an example.

  The heat source control device 50 is, for example, an MPU (Micro Processing Unit), and has a computer-readable recording medium on which a program for executing each process is recorded. The CPU (Central Processing Unit) is the recording medium. Each process is realized by reading the program recorded in the main memory device such as a RAM (Random Access Memory) and executing it. Examples of the computer-readable recording medium include a magnetic disk, a magneto-optical disk, and a semiconductor memory.

FIG. 2 shows a flowchart showing the control of the heat source system according to the present embodiment.
The heat source system 1 performs normal operation in a state where the system power consumption does not exceed the demand limit value (S201). The system power consumption indicates power consumption in the heat source system 1. In addition, the normal operation means a state in which any or all of the turbo chillers 10 are started and all the absorption chillers 20 are stopped in the present embodiment. Since the turbo chiller 10 is a highly efficient heat source machine, the turbo chiller 10 is usually started with priority over the absorption chiller 20.
The heat source control device 50 determines whether or not the system power consumption of the heat source system 1 is greater than or equal to the first power threshold (S202), and if it is determined that the system power consumption is greater than or equal to the first power threshold, step S203. Transition to. If it is determined in step S202 that the system power consumption is less than the first power threshold, the process returns to step S202 to determine again whether the system power consumption is greater than or equal to the first power threshold.
The first power threshold value of the system power consumption in step S202 is a value set to a value lower than the demand limit value so that the system power consumption does not exceed the demand limit value.

When it determines with system power consumption being more than a 1st electric power threshold value in step S202, the heat source control apparatus 50 starts replacement control from the normal operation of each heat source machine of the heat source system 1. FIG. Further, the heat source control device 50 stores the heat load A of the heat source system 1 at the time of starting replacement control.
First, the heat source control device 50 starts one of the absorption chillers 20 of the heat source system 1 (S203).
Next, the heat source control device 50 stops any of the turbo chillers 10 of the heat source system 1 (S204).
Thus, by starting the absorption chiller 20 first, the absorption chiller 20 that takes time from the start to the time when the capacity is exhibited can be used to change the indoor environment on the external device 80 side when switching from stop to start. Deterioration can be prevented.

Next, the heat source control device 50 determines that the current heat load is α with respect to the heat load A at the time point when the system power consumption is determined to be greater than or equal to the first power threshold in step S202 (starting time of replacement control) It is determined whether it is less than or equal to% (S205).
When it is determined that the current heat load is A × α% or less, the process proceeds to step S206. If it is determined in step S205 that the current thermal load is greater than A × α%, the process returns to step S205 to determine again whether the current thermal load is A × α% or less.
Here, α% is a value that is set so that the thermal load does not reach A in a short time in consideration of the fluctuation range of the thermal load. For example, 80 to 90% is set, and A × α% is the thermal load threshold value. Used as

When it is determined in step S205 that the current heat load is equal to or less than the heat load threshold A × α%, the heat source control device 50 performs control to return each heat source unit of the heat source system 1 to normal operation.
First, the heat source control device 50 starts one of the turbo chillers 10 of the heat source system 1 (S206).
Next, the heat source control device 50 stops any of the absorption chillers 20 of the heat source system 1 (S207).
By the above return control, the heat source system 1 returns to the normal operation (S208).

As described above, according to the heat source system, the control method for the heat source system, and the control program for the heat source system according to the present embodiment, the following effects can be obtained.
When the heat source system 1 is provided with heat source units with different power consumption, the turbo refrigerator 10 is normally started and the absorption refrigerator 20 is stopped. Here, when the system power consumption of the heat source system 1 increases and approaches the demand limit value, the absorption chiller 20 is started so as not to exceed the demand limit value, and the turbo chiller 10 is stopped to replace the heat source machine. Whether or not to return to the normal operation state from the state in which the heat source machine is replaced in this way is determined based on the heat load of the heat source system 1.
According to this configuration, in such determination of return control, return control can be performed at an appropriate timing by using the heat load of the heat source system 1 that does not change depending on the activated heat source unit.
Moreover, since the absorption refrigerator 20 is stopped after starting the turbo refrigerator 10, the deterioration of the supply temperature to the external device 80 connected to the heat source system 1 can be prevented.

Moreover, according to this embodiment, since the heat source system 1 replaces the heat source unit from the normal operation state according to the system power consumption, replacement control according to the actual dynamics of the heat source system 1 can be performed. Further, it is possible to avoid the possibility that the demand limit value will be exceeded without replacing the heat source device even though it is necessary to reduce the system power consumption.
For example, if the heat source device replacement control is forcibly performed for each time period, the heat source device is replaced even if it is not necessary to reduce the system power consumption. According to the present embodiment, unnecessary replacement control is performed and high efficiency control can be performed without giving priority to a low efficiency heat source unit.

  In addition, since the centrifugal chiller 10 is stopped after the absorption chiller 20 is started, the supply temperature to the external device 80 connected to the heat source system 1 by the absorption chiller 20 that requires time from the start to the performance is reduced. Can be prevented.

  Further, according to the present embodiment, since the heat load threshold is determined based on the heat load at the time when the replacement control of the immediately preceding heat source unit is performed, the control is performed according to the heat load at each replacement. . For example, it is assumed that the thermal load threshold is α% (α <100) of the thermal load at the time when the replacement control of the immediately preceding heat source unit is performed. It can be said that the system power consumption required for this is also reduced because the heat load is sufficiently lower than when the heat source machine replacement control is performed. That is, since it can be determined that the system power consumption does not exceed the demand limit value, it is possible to quickly return to a normal operation state with high efficiency.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.
In the first embodiment described above, the number of heat source machines to be replaced when the return control is performed from the state in which the heat source machines are replaced is not considered, but in this embodiment, the number of replacements is determined based on the capacity of each heat source machine. Considering return control. Since the other points are the same as in the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

FIG. 3 is a table showing the operating state of each heat source machine of the heat source system as the first reference example.
In the heat source system 1 of FIG. 1, it is assumed that each heat source machine is given priority as shown in FIG. 3, and each heat source machine is operated based on this priority.
FIG. 3A shows the operating state of each heat source machine during normal operation. During normal operation, the turbo chillers 10a and 10b are activated and operating based on the priority, and the turbo chiller 10c and the absorption chillers 20a and 20b are stopped.
When the replacement control is performed on the heat source system 1, as shown in FIG. 3B, the absorption refrigerator 20a is started based on the priority order, and then the turbo refrigerator 10b is stopped.
Next, when the return control is performed, as shown in FIG. 3C, the turbo refrigerator 10b is started based on the priority order, and then the absorption refrigerator 20a is stopped.

Here, when the return control is performed, the heat load is A × α% or less with respect to the heat load A at the start of the replacement control, that is, the heat load is sufficiently lowered.
When the rated refrigeration capacity of the turbo chiller 10b is larger than the rated refrigeration capacity of the absorption chiller 20a, performing the return control as described above reduces the load factor of the turbo chiller 10b and lowers the efficiency. End up. If the load factor is too low, the turbo chiller 10b may stop again.

FIG. 4 shows a table showing the operating state of each heat source machine of the heat source system as the second reference example.
In the heat source system 1 of FIG. 1, it is assumed that each heat source machine is given a priority as shown in FIG. 4, and each heat source machine is operated based on this priority.
FIG. 4A shows the operating state of each heat source machine during normal operation. During normal operation, the turbo chillers 10a, 10b, and 10c are activated and operating based on the priority order, and the absorption chillers 20a and 20b are stopped.
When the replacement control is performed on the heat source system 1, as shown in FIG. 4B, the absorption refrigerator 20a is started based on the priority order, and then the turbo refrigerator 10c is stopped.
Next, when the return control is performed, as shown in FIG. 4C, the turbo chiller 10c is started based on the priority order, and then the absorption chiller 20a is stopped.

  When the rated refrigeration capacity of the turbo chiller 10c is smaller than the rated refrigeration capacity of the absorption refrigeration machine 20a, when the return control as described above is performed, the thermal load shared by the absorption chiller 20a in the turbo chiller 10c I can't cover. Therefore, there exists a possibility that the absorption refrigerator 20a may start again.

In order to prevent useless start and stop of the heat source machine as in the reference example shown in FIGS. 3 and 4, the present embodiment considers the ability of the heat source machine to be started or stopped next and the heat load of the heat source system.
FIG. 5 shows a flowchart showing the control of the heat source system according to the present embodiment.
The heat source system 1 performs normal operation in a state where the system power consumption does not exceed the demand limit value (S501).
The heat source control device 50 determines whether or not the system power consumption of the heat source system 1 is greater than or equal to the first power threshold (S502). If it is determined that the system power consumption is greater than or equal to the first power threshold, step S503 is performed. Transition to. If it is determined in step S502 that the system power consumption is less than the first power threshold, the process returns to step S502 to determine again whether the system power consumption is greater than or equal to the first power threshold.

When it is determined in step S502 that the system power consumption is greater than or equal to the first power threshold, the heat source control device 50 starts replacement control from normal operation of each heat source unit of the heat source system 1. Further, the heat source control device 50 stores the heat load A of the heat source system 1 at the time of starting replacement control.
First, the heat source control device 50 starts one of the absorption chillers 20 of the heat source system 1 (S503).
Next, the heat source control device 50 stops any of the turbo chillers 10 of the heat source system 1 (S504).

Next, the heat source control device 50 determines that the current heat load is α with respect to the heat load A at the time when it is determined in step S502 that the system power consumption is equal to or greater than the first power threshold (starting time of replacement control). It is determined whether it is less than or equal to% (S505).
When it is determined that the current heat load is A × α% or less, the process proceeds to step S506. If it is determined in step S505 that the current thermal load is greater than A × α%, the process returns to step S505 to determine again whether the current thermal load is A × α% or less.

When it is determined in step S505 that the current heat load is A × α% or less, the heat source control device 50 performs control to return each heat source unit of the heat source system 1 to normal operation. α% is set so that the heat load does not reach the heat load at the time when the replacement control of the immediately preceding heat source unit is performed in consideration of the fluctuation range of the heat load, for example, 80 to 90% is set. ing. The current heat load being A × α% or less means that the heat load is sufficiently lower than when the heat source unit replacement control is performed, and the system power consumption required for that is also reduced. It can be said. That is, it can be determined that the system power consumption does not exceed the demand limit value, and the return control to the normal operation can be performed.
First, the heat source control device 50 starts one of the turbo chillers 10 whose heat source system 1 is stopped and has the highest priority, and one of the absorption chillers 20 that is in operation has the lowest priority. It is determined whether or not the load factor of each turbo refrigerator 10 is equal to or greater than the load factor threshold (S506).
When it determines with the load factor of each turbo refrigerator 10 being more than a load factor threshold value, it changes to step S507. If it is determined in step S506 that the load factor of each turbo refrigerator 10 is less than the load factor threshold value, the process proceeds to step S508.
If it is determined in step S506 that the load factor of each turbo chiller 10 is equal to or greater than the load factor threshold value, one of the turbo chillers 10 in which the heat source system 1 is stopped is started with the highest priority ( S507).
The load factor threshold value in step S506 is a threshold value of the load factor provided so as not to stop when the load factor of each turbo chiller 10 decreases too much, and is larger than the load factor at which each turbo chiller 10 stops. It is the value set in the value.

Next, when the heat source control device 50 assumes that one of the absorption chillers 20 in operation of the heat source system 1 has the lowest priority, the heat load of the heat source system 1 is 100% or less. Is determined (S508). That the heat load is 100% or less means that the heat source system 1 is covering all of the heat load of the heat source system 1.
When it determines with the heat load of the heat source system 1 being 100% or less, it changes to step S509. If it is determined in step S508 that the heat load of the heat source system 1 exceeds 100%, the process proceeds to step S510.
If it is determined in step S508 that the heat load of the heat source system 1 is 100% or less, the heat load of the heat source system 1 even if one of the absorption chillers 20 that is operating is stopped is stopped. Therefore, the corresponding absorption refrigerator 20 is stopped (S509).
With the above return control, the heat source system 1 returns to the normal operation (S510).

As described above, according to the heat source system, the control method for the heat source system, and the control program for the heat source system according to the present embodiment, the following effects can be obtained.
In the present embodiment, it is assumed that one turbo chiller 10 is started and one absorption chiller 20 is stopped when the heat source machine is returned to the normal operation state from the exchanged state. At this time, if the load factor of the turbo chiller 10 is equal to or greater than the threshold value, that is, if the turbo chiller 10 is not in a low load state, one turbo chiller 10 is activated. Next, assuming that one absorption refrigerator 20 is stopped, the heat load of the heat source system 1 is 100% or less, that is, even if one absorption refrigerator 20 is stopped, If all heat loads can be shared, one absorption refrigerator 20 is stopped.

For example, when the rated capacity varies depending on each heat source machine, the turbo chiller 10 is started by the number of turbo chillers 10 stopped last time, and the absorption chiller 20 is stopped by the number of absorption chillers 20 started last time. To do. In this case, the turbo chiller 10 is in a low load state due to the difference in capacity, and “the activated turbo chiller 10 stops again” or the heat source that is being activated cannot cover the heat load of the heat source system 1 and “stopped absorption”. There is a possibility that the refrigerator 20 will start again. In this embodiment, in consideration of the possibility of such a useless start and stop of the heat source unit, in the present embodiment, the start and absorption refrigerators of the turbo refrigerator 10 are considered in consideration of the ability and heat load of the heat source unit to start and stop next. It is determined whether 20 stops are necessary.
Thereby, useless start / stop of the heat source device such as restart of the activated heat source device or restart of the stopped heat source device is not caused.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
In the first embodiment described above, the replacement number of the heat source units when performing the replacement control of the heat source units from the normal operation state is not considered, but in this embodiment, the replacement control is performed in consideration of the replacement number. is there. Since the other points are the same as in the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

  FIG. 6 shows a flowchart showing the control of the heat source system according to the present embodiment.

The heat source system 1 performs normal operation in a state where the system power consumption does not exceed the demand limit value (S601).
The heat source control device 50 determines whether or not the system power consumption of the heat source system 1 is greater than or equal to the first power threshold (S602). If it is determined that the system power consumption is greater than or equal to the first power threshold, step S603 is performed. Transition to. If it is determined in step S602 that the system power consumption is less than the first power threshold, the process returns to step S602 to determine again whether the system power consumption is equal to or greater than the first power threshold.

If it is determined in step S602 that the system power consumption is greater than or equal to the first power threshold, the heat source control device 50 starts replacement control from normal operation of each heat source unit of the heat source system 1. Further, the heat source control device 50 stores the heat load A of the heat source system 1 at the time of starting replacement control.
First, the heat source control device 50 activates one of the absorption chillers 20 having the highest priority among the absorption chillers 20 whose heat source system 1 is stopped (S603).
Next, the heat source control device 50 stops one of the lowest priority units among the turbo chillers 10 that are operating the heat source system 1 (S604).
The heat source control device 50 determines again whether or not the system power consumption of the heat source system 1 is greater than or equal to the first power threshold (S605), and if it is determined that the system power consumption is greater than or equal to the first power threshold, the step. The process proceeds to S603. In this way, each time the system power consumption becomes equal to or higher than the first power threshold value, the heat source unit replacement control is performed one by one.
If it is determined in step S605 that the system power consumption is less than the first power threshold, the process proceeds to step S606.

Next, the heat source control device 50 determines whether or not the heat load of the heat source system 1 is 100% or less (S606).
When it determines with the heat load of the heat source system 1 being 100% or less, it changes to step S607. If it is determined in step S606 that the heat load of the heat source system 1 exceeds 100%, the process proceeds to step S605.
If it is determined in step S606 that the heat load of the heat source system 1 is 100% or less, one of the turbo chillers 10 in which the heat source system 1 is stopped is activated (S607). ).
Next, one of the absorption chillers 20 that is operating the heat source system 1 is stopped (S608).
With the above return control, the heat source system 1 returns to the normal operation (S609).

As described above, according to the heat source system, the control method for the heat source system, and the control program for the heat source system according to the present embodiment, the following effects can be obtained.
According to the present embodiment, the heat source devices are replaced one by one from the normal operation state according to the system power consumption, so that the system power consumption is prevented from exceeding the demand limit value and at the same time the efficiency is too low. Can be avoided.
If the replacement from the high-efficiency turbo chiller 10 to the low-efficiency absorption chiller 20 is performed more than necessary, the heat source system 1 will be operated with low efficiency. By reducing the number of replacement to the low-efficiency absorption refrigerator 20 one by one, a decrease in efficiency can be suppressed.

[Fourth Embodiment]
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.
In the first to third embodiments described above, the heat source device of the heat source system is replaced based on the system power consumption for the demand control. However, in this embodiment, the water supply setting is performed in addition to the replacement of the heat source device for the demand control. The temperature control is performed. Since the other points are the same as in the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

FIG. 7 shows a flowchart showing the control of the heat source system according to the present embodiment.
The replacement control of the heat source unit of the heat source system 1 based on the system power consumption and the water supply set temperature control of the heat source system 1 based on the system power consumption shown in Patent Document 2 are performed in combination. The water supply set temperature is a set temperature of heat source water supplied from each heat source machine to the external device 80. Since both controls are based on the system power consumption, if the threshold values of the respective system power consumptions are set to the same value, the replacement control and the water supply set temperature control become effective at the same timing. In order to prevent this, each system power consumption threshold value of the replacement control and the water supply set temperature control is set to a different value.
The system power consumption threshold value for the replacement control is the first power threshold value, the system power consumption threshold value at the start of the water supply set temperature increase for the water supply set temperature control is the second power threshold value, and the system power consumption at the end of the water supply set temperature increase for the water supply set temperature control The threshold is the third power threshold.
When the first power threshold is set to a value lower than the second power threshold, replacement control is performed first. If the system power consumption further increases even after the replacement control is performed, the water supply set temperature control is performed. This setting is preferably selected when it is desired to suppress changes in the water supply temperature after the demand control has converged.
When the first power threshold is set to a value higher than the second power threshold, the water supply set temperature control is performed first. Even if the water supply set temperature control is performed, if the system power consumption further increases, the replacement control is performed. This setting is preferably selected when it is desired to suppress the occurrence of a transient deterioration of the indoor environment due to the replacement of the heat source device.
About said setting, it can select according to a use. Also, the setting is not fixed and may be switched.
The second power threshold is a value set to a value lower than the demand limit value so that the system power consumption does not exceed the demand limit value in the water supply set temperature control.
In addition, a value equal to or smaller than the second power threshold is set as the third power threshold. However, the third power threshold and the second power threshold may be set to the same value.
In the present embodiment, a case where the first power threshold is set to a value lower than the second power threshold will be described.

The heat source system 1 performs normal operation in a state where the system power consumption does not exceed the demand limit value (S701).
The heat source control device 50 determines whether or not the system power consumption of the heat source system 1 is greater than or equal to the first power threshold (S702). If it is determined that the system power consumption is greater than or equal to the first power threshold, step S703 is performed. Transition to. If it is determined in step S702 that the system power consumption is less than the first power threshold, the process returns to step S702 to determine again whether the system power consumption is greater than or equal to the first power threshold.

If it is determined in step S702 that the system power consumption is greater than or equal to the first power threshold, the heat source control device 50 starts replacement control from normal operation of each heat source unit of the heat source system 1. Further, the heat source control device 50 stores the heat load A of the heat source system 1 at the time of starting replacement control.
First, the heat source control device 50 starts one of the absorption chillers 20 of the heat source system 1 (S703).
Next, the heat source control device 50 stops any of the turbo chillers 10 of the heat source system 1 (S704).

  Subsequently, the heat source control device 50 determines whether or not the system power consumption is greater than or equal to the second power threshold (S705). If it is determined that the system power consumption is greater than or equal to the second power threshold, the process proceeds to step S706. Transition. If it is determined in step S705 that the system power consumption is less than the second power threshold, the process returns to step S705 to determine again whether the system power consumption is greater than or equal to the second power threshold.

  When it determines with system power consumption being more than a 2nd electric power threshold value in step S705, the water supply preset temperature control of the heat source system 1 is implemented. That is, an increase in the water supply set temperature of the heat source system 1 is started (S706).

  Subsequently, the heat source control device 50 determines whether or not the system power consumption is less than the third power threshold (S707). If it is determined that the system power consumption is less than the third power threshold, the process proceeds to step S708. Transition. If it is determined in step S707 that the system power consumption is greater than or equal to the third power threshold, the process returns to step S707 to determine again whether the system power consumption is less than the third power threshold.

  If it is determined in step S707 that the system power consumption is less than the third power threshold, the water supply set temperature control of the heat source system 1 is terminated. That is, the increase in the water supply set temperature of the heat source system 1 is finished (S708).

Next, the heat source control device 50 determines that the current heat load is α with respect to the heat load A when the system power consumption is determined to be greater than or equal to the first power threshold in step S702 (when the replacement control is started). It is determined whether it is less than or equal to% (S709).
When it is determined that the current heat load is A × α% or less, the process proceeds to step S710. If it is determined in step S709 that the current thermal load is greater than A × α%, the process returns to step S709 to determine again whether the current thermal load is A × α% or less.

When it is determined in step S709 that the current heat load is A × α% or less, the heat source control device 50 performs control to return each heat source unit of the heat source system 1 to normal operation.
First, the heat source control device 50 starts one of the turbo chillers 10 of the heat source system 1 (S710).
Next, the heat source control device 50 stops any of the absorption chillers 20 of the heat source system 1 (S711).
With the above return control, the heat source system 1 returns to normal operation (S712).

As described above, according to the heat source system, the control method for the heat source system, and the control program for the heat source system according to the present embodiment, the following effects can be obtained.
In addition to the heat source machine replacement control according to the system power consumption of the heat source system 1 described above, the water supply set temperature is controlled according to the system power consumption. Here, the threshold values of the system power consumption of the heat source system 1 are set to different values so that the replacement control of the heat source machine and the control of the water supply set temperature are not performed at the same timing.
Thereby, the effect which suppresses the system power consumption of the heat source system 1 can further be heightened.

As mentioned above, although each embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention. .
For example, you may implement combining each embodiment mentioned above.

  In each embodiment, the first heat source machine is a turbo chiller and the second heat source machine is an absorption chiller. However, the first heat source machine is a heat source machine that consumes a large amount of power among the heat source machines. If the heat source machine is a heat source machine that consumes less power than the first heat source machine, the type thereof is not limited. For example, the combination of the first heat source machine and the second heat source machine includes an electric heat source machine and a fuel system heat source machine, a large turbo refrigerator and a small turbo refrigerator, a variable speed turbo heat source machine and a fixed speed turbo heat source machine, and the like.

1 Heat source system 10 Turbo refrigerator (first heat source machine)
20 Absorption refrigerator (second heat source machine)
50 Heat source control device 80 External equipment

Claims (8)

Multiple heat source machines,
A heat source system comprising a control device for controlling the heat source machine,
When the heat load of the heat source system is equal to or less than the heat load threshold when the first heat source machine is stopped and the second heat source machine that consumes less power than the first heat source machine is activated, The heat source system that starts the first heat source unit and then stops the second heat source unit. The control device, when the first heat source machine is stopped and the second heat source machine is activated, the heat load of the heat source system is equal to or less than the heat load threshold,
If the load factor of the first heat source machine is equal to or higher than a load factor threshold when it is assumed that one of the first heat source machines is started and then one of the second heat source machines is stopped, the first heat source machine Start one,
And / or
2. The heat source system according to claim 1, wherein when the heat load of the heat source system is 100% or less when it is assumed that one of the second heat source machines is stopped, one of the second heat source machines is stopped.   If the system power consumption of the heat source system is equal to or higher than a first power threshold when the first heat source unit is activated and the second heat source unit is stopped, the control device is configured to switch the second heat source unit. The heat source system according to claim 1 or 2, wherein all are started, and then all the first heat source machines are stopped.   When the first heat source unit is activated and the second heat source unit is stopped, the control device performs the second heat source unit whenever the system power consumption of the heat source system becomes equal to or greater than a first power threshold. The heat source system according to claim 1 or 2, wherein one unit is activated and then one of the first heat source units is stopped. If the system power consumption of the heat source system is greater than or equal to a second power threshold, the control device starts increasing the water supply set temperature, which is the set temperature of the heat source water supplied from the heat source unit to an external device, If the system power consumption of the heat source system is less than the third power threshold, the increase in the water supply set temperature is terminated,
The first power threshold is a value different from the second power threshold and the third power threshold, and the third power threshold is a value equal to or less than the second power threshold. Heat source system.   The heat load threshold value is determined based on the heat load of the heat source system at the time when the system power consumption of the immediately preceding heat source system becomes equal to or higher than the first power threshold value. Heat source system as described in. Multiple heat source machines,
In a heat source system comprising a control device that controls the heat source machine,
If the heat load of the heat source system is equal to or less than the heat load threshold when the first heat source machine is stopped and the second heat source machine that consumes less power than the first heat source machine is activated, the first heat source A control method of a heat source system for performing control to start all the machines and subsequently stop all the second heat source machines. Multiple heat source machines,
In a heat source system comprising a control device that controls the heat source machine,
If the heat load of the heat source system is equal to or less than the heat load threshold when the first heat source machine is stopped and the second heat source machine that consumes less power than the first heat source machine is activated, the first heat source A control program for a heat source system that performs control to start all the machines and subsequently stop all the second heat source machines.

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