JP2016031175A - Heat source machine system and operational method for heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source machine system and an operational method for the heat source machine for controlling and stopping operations of a plurality of heat source machines in such a way that an operation time that is a time elapsed from an installing time of the heat source machine or maintenance time and a driving time that is a time actually starting from the time of installation or maintenance time may be coincided to each other as much as possible.SOLUTION: A driving heat source machine 1 and a stopping heat source machine 1 in a heat source machine system for operating and stopping a plurality of heat source machines 1 are judged on the basis of a driving time ratio defined as a ratio between an operating time that is a time elapsed from an installing time or maintenance time of the heat source machine 1 and a driving time that is a time when the heat source machine 1 is actually operated from the installing time or the maintenance time.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat source system that controls the operation and stop of a plurality of heat source units used in air conditioning and temperature control equipment, and a method of operating the heat source unit.

  The inspection interval (interval) of heat source equipment used for air conditioning and temperature control is generally the operation period that is the period that has elapsed since the installation or maintenance of the heat source equipment, and the actual heat source equipment from the time of installation or maintenance. It is defined by both driving time, which is the driving time. For example, it is defined as “operating period 7 years or operating time every 20,000 hours”. In addition, the case where the yearly operation period is converted into the time unit is referred to as operation time. In the following description, the operation period and the operation time are used as appropriate. The reason why the inspection cycle is defined by both the operation period and the operation time is as follows.

First, parts such as bearings that wear or decrease when the heat source unit is operated need to be inspected or replaced (hereinafter referred to as “maintenance”) every designed operating time. That is, the maintenance is required when the operation time that is the time when the heat source machine is actually operated from the time of installation or maintenance reaches the designed operation time. Here, this is referred to as “inspection time”.
On the other hand, parts that are subject to deterioration over time, such as gaskets and resin parts, need to be maintained depending on the operation period, which is the period that has elapsed since the installation or maintenance of the heat source machine. Here, this is referred to as “inspection period”.

  However, regardless of which factor is used for maintenance, the work content of the maintenance does not change much. On the other hand, many costs are incurred for inspection and replacement of heat source equipment. That is, in general, these maintenance operations require operations such as removing a heat transfer medium such as water in the heat source machine, a heat medium, etc., and drawing an inert gas. This is because, depending on the case, a large-scale work such as moving or carrying out the heat source machine is required. Therefore, it is desirable to perform these maintenance at the same time.

JP 2012-117698 A

  However, since the actual operation time of the heat source machine varies greatly depending on the site where it is installed, which of the operation period and the operation time is rate-limiting changes. That is, even if the heat source machine has a seven-year inspection period, the operation time may reach the inspection time in the sixth year. In such a case, it is necessary to carry out the maintenance scheduled for the seventh year ahead of schedule for the sixth year, which increases the cost required for operation. For this reason, it is preferable to shorten the operating time of each heat source unit as much as possible. The operating cost is reduced by keeping the number of heat source units to be operated as small as possible and maintaining the load per heat source unit as high as possible. It has been done to try to lower.

  However, depending on the heat source device, the efficiency can be improved by increasing the number of operating units. That is, in an absorption heat source machine, a screw type heat source machine, or an inverter-driven turbo heat source machine, there are heat source machines and operating conditions (cooling water temperature, etc.) that are more efficient when the load is about 30 to 60%. In some cases, it is more energy efficient to increase the number of operating units and reduce the load per unit (see Patent Document 1). In other words, when considering the life cycle cost, it is better to reduce the cost required for maintenance by reducing the number of operating heat source units, or reducing the energy consumption by operating at the optimum load, which reduces the overall cost. It is difficult to draw conclusions. Conversely, even if it is known that energy conservation can be achieved by increasing the number of operating heat source units, it may not be possible to implement due to concerns over an increase in maintenance costs. Therefore, there is a demand for a method for saving energy while suppressing the increase in energy consumption.

  The present invention has been made in view of the above circumstances, and in a heat source system that operates and stops a plurality of heat source units, inspection and installation by the operation time that is the time elapsed since the installation or maintenance of the heat source unit, Heat source system that controls the operation and stop of multiple heat source units and the operation of the heat source unit so that the inspection by the operation time, which is the time when the heat source unit is actually operated from the time of maintenance or maintenance, is matched as much as possible It aims to provide a method.

  In order to achieve the above-described object, the heat source system of the present invention is a heat source system that operates and stops a plurality of heat source units, an operation time that is the time elapsed since the installation or maintenance of the heat source unit, and the installation It is characterized in that a heat source machine to be operated and a heat source machine to be stopped are determined based on an operation time ratio defined as a ratio with an operation time that is an actual operation time of the heat source apparatus from the time of maintenance or maintenance. .

According to a preferred aspect of the present invention, based on the remaining operation time, which is the difference between the actual operation time and the value obtained by multiplying the predetermined operation time ratio for each heat source unit by the operation time. It is characterized by determining the heat source machine to be stopped and the heat source machine to be stopped.
According to a preferred aspect of the present invention, an alarm is issued when the operation time ratio falls below a specified value or when the remaining operation time exceeds a specified value.
According to a preferred aspect of the present invention, the operation is performed from the heat source device having a small operation time ratio or the heat source device having a long operation remaining time, and is stopped from the heat source device having a small operation remaining time.

According to a preferred aspect of the present invention, during operation of the heat source unit, the heat source unit with a short remaining operation time is stopped and a large number of heat source units are operated.
According to a preferred aspect of the present invention, when the energy consumption is estimated to decrease by increasing the number of operating heat source units, the operating time ratio of the heat source unit to be operated exceeds the preset value. Alternatively, when the remaining operation time is lower, this is not operated, and when the operation time ratio is lower or the remaining operation time is longer, the heat source device is operated.
According to a preferred aspect of the present invention, when a compression-type heat source device using an inverter-controlled compressor is used as a heat source device, the operation time is the actual operation time and the operation rotation at that time The operation time is defined as an equivalent operation time which is a value obtained by multiplication by speed.
According to a preferred aspect of the present invention, the heat source machine having a short reference operation time ratio is preferentially operated.

The operation method of the heat source apparatus of the present invention is the operation method of the heat source apparatus that operates and stops a plurality of heat source apparatuses, the operation time that is the time elapsed since the installation or maintenance of the heat source apparatus, and the installation or maintenance time From the operation time ratio defined as the ratio of the operation time, which is the actual operation time of the heat source device, to determine the heat source device to be operated and the heat source device to be stopped.
According to a preferred aspect of the present invention, based on the remaining operation time, which is the difference between the actual operation time and the value obtained by multiplying the predetermined operation time ratio for each heat source unit by the operation time. It is characterized by determining the heat source machine to be stopped and the heat source machine to be stopped.

According to a preferred aspect of the present invention, an alarm is issued when the operation time ratio falls below a specified value or when the remaining operation time exceeds a specified value.
According to a preferred aspect of the present invention, the operation is performed from the heat source device having a small operation time ratio or the heat source device having a long operation remaining time, and is stopped from the heat source device having a small operation remaining time.
According to a preferred aspect of the present invention, during operation of the heat source unit, the heat source unit with a short remaining operation time is stopped and a large number of heat source units are operated.
According to a preferred aspect of the present invention, when the energy consumption is estimated to decrease by increasing the number of operating heat source units, the operating time ratio of the heat source unit to be operated exceeds the preset value. Alternatively, when the remaining operation time is lower, this is not operated, and when the operation time ratio is lower or the remaining operation time is longer, the heat source device is operated.

According to a preferred aspect of the present invention, when a compression-type heat source device using an inverter-controlled compressor is used as a heat source device, the operation time is the actual operation time and the operation rotation at that time The operation time is defined as an equivalent operation time which is a value obtained by multiplication by speed.
According to a preferred aspect of the present invention, the heat source machine having a short reference operation time ratio is preferentially operated.

  The control device of the heat source system of the present invention is a control device of the heat source system that operates and stops a plurality of heat source units, and the control device is an operation time that is an elapsed time from the installation or maintenance of the heat source unit. And determining the heat source machine to be operated and the heat source machine to be stopped based on the operation time ratio defined as the ratio of the operation time that is the time when the heat source machine is actually operated from the time of installation or maintenance. Features.

According to a preferred aspect of the present invention, the control device is a remaining operation time which is a difference between a value obtained by multiplying a reference operation time ratio predetermined for each heat source unit by the operation time and an actual operation time. Based on the above, the heat source machine to be operated and the heat source machine to be stopped are judged.
According to a preferred aspect of the present invention, the control device issues an alarm when the operation time ratio falls below a specified value or when the remaining operation time exceeds a specified value.
According to a preferred aspect of the present invention, the control device operates from a heat source device having a small operation time ratio or a heat source device having a large operation remaining time, and stops from the heat source device having a small operation remaining time. To do.

According to a preferred aspect of the present invention, the control device is characterized in that during operation of the heat source unit, the heat source unit with a short remaining operation time is stopped and a large number of heat source units are operated.
According to a preferred aspect of the present invention, when it is estimated that the energy consumption decreases by increasing the number of operating heat source units, the control device uses a preset value as the operating time of the heat source unit to be operated. If the ratio exceeds or the remaining operation time falls, this is not operated, and if the operation time ratio falls below or the remaining operation time exceeds, the heat source machine is operated. To do.

According to a preferred aspect of the present invention, when the control device uses a compression heat source machine that uses an inverter-controlled compressor as the heat source machine, the operation time is the actual operation time. The operation time is defined as an equivalent operation time which is a value obtained by multiplying by the operation rotation speed at that time.
According to a preferred aspect of the present invention, the control device is configured to preferentially operate a heat source device having a short reference operation time ratio.

  According to the present invention, systematic maintenance and energy saving can be achieved while the maintenance of the heat source machine is suppressed to the minimum number of times.

FIG. 1 is a schematic diagram showing an embodiment of a heat source machine system according to the present invention. FIG. 2 is a graph showing the simulation result of the first embodiment of the present invention. FIG. 3 is a graph showing the simulation result of the second embodiment of the present invention. FIG. 4 is a graph showing the simulation result of the third embodiment of the present invention. FIG. 5 is a graph showing the simulation result of the fourth embodiment of the present invention. FIG. 6 is a graph showing the simulation result of the fifth embodiment of the present invention.

  Embodiments of a heat source system and a heat source operation method according to the present invention will be described below with reference to FIGS. 1 to 6. 1 to 6, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic diagram showing an embodiment of a heat source machine system according to the present invention. As shown in FIG. 1, the heat source apparatus system includes a plurality of heat source apparatuses 1 and a control device 2 that controls operation and stop of the plurality of heat source apparatuses 1. In FIG. 1, a heat source device system including two heat source devices 1 is illustrated, but three or more heat source devices 1 may be provided. Each heat source machine 1 is connected to a control device 2, and the control device 2 collects various data including operation time and operation time of each heat source machine 1. That is, the control device 2 operates in the operation time that is the time that has elapsed since the installation or maintenance of each of the plurality of heat source devices 1, and the operation that is the time that each heat source device 1 is actually operated from the time of installation or maintenance. Aggregate various data including time. The control device 2 controls the operation and stop of the plurality of heat source units 1 based on the operation time and the operation time.

In the heat source unit system configured as shown in FIG. 1, when a plurality of heat source units are operated independently or in parallel to cope with the load, the operation time is appropriately managed to save energy while suppressing an increase in maintenance cost. There is a need for a method for achieving this.
In order to solve this problem, maintenance based on the operation time, which is the time elapsed since the installation or maintenance of the heat source equipment, and maintenance based on the operation time, which is the time the heat source equipment was actually operated from the time of installation or maintenance, are implemented. Match as much as possible. However, since the operation time of the heat source machine cannot be controlled, it is only necessary to control the operation / stop so that the operation time of the heat source machine matches the operation time.
Therefore, in the present invention, in order to match the two as much as possible, the control device 2 obtains an “operation time ratio” that is a ratio between the operation time and the operation time, and thereby, among a plurality of heat source machines, the operation and stop It was decided to select a heat source machine.

As the simplest method, it is conceivable that the operation time ratio is obtained for each heat source unit, and the operation is started from the one with the few. However, since it is better for the control device to calculate using integers as much as possible, it is better to control as follows.
In the present invention, the reference operation time ratio is determined for each heat source machine. The standard operation time ratio is determined by the ratio of operation time and operation time that require maintenance. That is, if the operation period is 7 years or the heat source machine needs to be inspected every 20,000 hours, the ratio between the operation time and the operation time is 20,000: 7 × 365 × 24≈0.326: 1. Therefore, this is set to 0.32 (the internal value at the time of calculation is 32 multiplied by 100). The reason for rounding down the value instead of rounding is to avoid exceeding the operating time within the operating hours as much as possible, but rounding off is also acceptable. As will be described later, the reference operation time ratio is originally determined for each heat source unit, but here, it is assumed that all are set to the same value.

The control device 2 monitors the operation time and operation time of the heat source machine. Then, for each heat source machine, the operation time is multiplied by the reference operation time ratio to obtain the difference between this and the actual operation time, and this is defined as “remaining operation time”. This is expressed as follows. Needless to say, when an integer value multiplied by a constant is used, division by a constant is also performed.
Remaining operation time = operation time × reference operation time ratio−operation time Here, the control device is operated from a heat source unit having a long operation remaining time. Thereby, operation time can be equalized appropriately.

  The following control can also be performed. That is, while the heat source unit is in operation, the value obtained by multiplying the reference operation time ratio by the unit time is integrated, and this is regarded as the equivalent operation time, or the difference between the operation time that is short or equivalent It is a method of driving from a long one. These methods are essentially equivalent to the method of the present invention described so far, only by changing the calculation order and the unit (dimension) of the reference value, and the operation order is determined by this method according to the situation. May be.

Hereinafter, although the method based on the remaining operation time will be described in detail, it may be determined using the operation time ratio or equivalent operation time by the same method.
The method of the present invention is different from the conventional method based only on the operation time in that heat source devices with different installation times and the like may be mixed. In other words, when the operation time is simply, if the installation time is different, the operation time is naturally shorter for the newly installed heat source unit, so that only the operation time is operated. As a result, the operation time is rather biased and the inspection cycle may be accelerated. According to the present invention, both the newly installed heat source machine and the previously installed heat source machine are operated equally, which is excellent in this respect.
However, in such a case, the conventional technology has performed as follows. That is, while using a method based on the operation time, the operation time is reset at regular intervals such as every month, and the operation time is made uniform within the period. A method of resetting when new machines increase is often used. This is sufficient if the operating time is only made uniform.

However, the present invention can be operated as follows. That is, when setting the reference operation time for the heat source unit, the reference operation time ratio is determined assuming a different inspection period for each heat source unit. Specifically, the reference operation time ratio is determined using different values, such as three and a half years for the heat source machine (priority heat source machine) to be operated intensively and 7 years for the other heat source machines. In this case, the former is 0.65 and the latter is 0.32.
In this way, the priority heat source unit is estimated to have a longer remaining operation time than other heat source units, so the frequency of operation will increase, and naturally the inspection time will be reached sooner, and maintenance will be performed during the maintenance by the operation time ( Intermediate maintenance) is required. However, by setting the inspection period of the priority heat source machine to be exactly half of the original inspection period, or 1/3, etc., the second or third maintenance is the maintenance based on the operation period. Will match.

  In this case, since the operation of the heat source devices other than the priority heat source device is suppressed, the maintenance by the operation time is less likely to come before the maintenance by the operation time. In other words, the priority heat source machine requires intermediate maintenance, but in exchange, intermediate maintenance of other heat source machines becomes unnecessary. This is an effect that cannot be obtained by a method such as equalizing the operation time for each month, and is one of the advantages of the present invention. Another advantage is that heat source machines with different inspection periods and inspection times may be mixed. The number of priority heat source machines and the setting of the inspection cycle may be determined based on the load prediction and actual results for each site.

  Moreover, when setting using an important heat source machine (operation time ratio differs), an important heat source machine can also be started preferentially as long as the remaining operation time remains. In this way, the operation of heat source machines other than the priority heat source machine is further suppressed, and after the maintenance of the priority heat source machine, the load suddenly increases due to changes in the operating conditions of the equipment, etc. Even if the time becomes longer, the possibility of having to advance the inspection time for that purpose can be reduced.

  In addition, if the remaining operation time is monitored, the maintenance plan can be easily changed. In other words, if the remaining operation time is constantly below 0, the load on the heat source machine exceeds the initial assumption, and if the operation is continued as it is, an unscheduled intermediate maintenance is required or the maintenance may be delayed. It shows that it is necessary. Therefore, when this becomes clear, it is possible to minimize the increase in intermediate maintenance by changing the maintenance plan and resetting the reference operation time ratio of the heat source unit accordingly. In this case, it is easiest to monitor by monthly report or the like, but it is desirable that the heat source system issues a warning or the like when the remaining operation time is less than a specified value.

  Further, the present invention is also effective when it is desired to shift the maintenance time for each heat source machine because all the facilities cannot be stopped at the same time. That is, even with a heat source machine installed at the same time, the maintenance time can be shifted little by little by setting the reference operation time ratio little by little. In particular, if a maintenance time is scheduled for each heat source unit, an inspection period is set based on this, and a reference operation time ratio is set based on this, the heat source unit can be maintained at an optimal time.

  In addition, when using a heat source machine that is more efficient when the load is smaller, the present invention is also effective in determining whether to reduce the number of operations and reduce the number of inspections or increase the number of operations to improve efficiency. . That is, as a result of the determination based on the operating state, if the efficiency can be improved by increasing the number of operating units and decreasing the load, the control device checks the remaining operating time of the heat source unit to be operated. If the remaining driving time exceeds a predetermined value, this is driven, but if the remaining driving time is less than the specified time, it is not driven. As a result, the heat source machine is operated up to the last operation time to operate at the optimum load, and at the same time, the increase in the number of maintenance due to the excess of the operation time is prevented.

In a variable speed compressor or the like, the life (inspection time) of the bearing is proportional to the rotational speed. That is, if the rotation speed is half, the inspection time may be doubled. Therefore, the following may be performed.
In a compression heat source machine that uses a variable speed compressor such as an inverter drive, the ratio of the rotation speed and the rated rotation speed is multiplied by the unit time, and this is taken as the equivalent operation time. Considered driving time. By using this to stop operation, the number of inspections can be further reduced.

FIG. 2 is a graph showing the simulation result of the first embodiment of the present invention. In FIG. 2, the horizontal axis indicates elapsed time (monthly), and the vertical axis indicates operating time and remaining operating time (monthly). In the simulation, the load factor of each month is determined by a random number, and the operation time and the remaining operation time when the operation unit is determined according to the method described above are shown for each unit. The same applies to the second and subsequent embodiments.
In this embodiment, two heat source machines are used, and both are set to a reference operation time ratio of 0.32. As shown in FIG. 2, it can be seen that the two heat source machines are operated on average and the operation time is made uniform.

FIG. 3 is a graph showing the simulation result of the second embodiment of the present invention. In FIG. 3, the horizontal axis indicates elapsed time (monthly), and the vertical axis indicates operating time and remaining operating time (monthly). This is a case where the reference operation time ratio is set to 0.32 for both heat source machines, but this is a case where the heat source machines are switched halfway due to a failure or the like.
Even in this case, as shown in FIG. 3, it can be seen that the two heat source machines are operated on average, and the operation time is uniformized. In addition, the same effect can be expected by adding a heat source machine instead of replacement.

FIG. 4 is a graph showing the simulation result of the third embodiment of the present invention. In FIG. 4, the horizontal axis indicates elapsed time (monthly), and the vertical axis indicates operating time and remaining operating time (monthly). This is a case where the reference operation time ratio of one heat source machine (critical heat source machine) is 0.65 and the other is 0.32 with two heat source machines.
In this case, as shown in FIG. 4, it can be seen that the operation time of the heat source machine is approximately 1: 2, and a margin for the operation time is secured.

FIG. 5 is a graph showing the simulation result of the fourth embodiment of the present invention. In FIG. 5, the horizontal axis indicates elapsed time (monthly), and the vertical axis indicates operating time and remaining operating time (monthly). This is the case where the reference operation time ratio of one heat source machine (important heat source machine) is 0.65 and the other is 0.32 with two heat source machines, but when the priority heat source machine operation is prioritized. is there.
That is, in the third embodiment, the one with the longer remaining operation time is simply operated. However, in this embodiment, the first unit (critical heat source device) is operated if the remaining operation time is 0 or more.
In this case, when compared with the third embodiment, it can be seen that the operation time of the second machine is suppressed and there is a margin in the remaining operation time.

FIG. 6 is a graph showing the simulation result of the fifth embodiment of the present invention. In FIG. 6, the horizontal axis represents elapsed time (monthly), and the vertical axis represents operation time and remaining operation time (monthly). In this example, two heat source machines were initially set with a reference operation time ratio of 0.32, but the load exceeded the assumption and the remaining operation time was constantly 0 or less. This is a case where the reference operation time ratio is changed to 0.65.
In this case, since the remaining operation time of the first unit increases at the time of change, the first unit is operated and the operation time of the second unit is shortened. As a result, the remaining operation time of both units is restored, and intermediate maintenance is required for Unit 1, but it can be unnecessary for Unit 2 until the inspection period.
In the conventional case, if the operation is continued as it is, both the first and second units will be inspected before the inspection period, and both units will need intermediate maintenance or advance maintenance. As described above, in the present invention, it is possible to easily detect the possibility that intermediate maintenance occurs, and it is possible to avoid intermediate maintenance by changing the setting in the middle.

  Although the embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention may be implemented in various different forms within the scope of the technical idea.

1 Heat source machine 2 Control device

Claims (24)

In a heat source system that operates and stops a plurality of heat source units,
Based on the operation time ratio defined as the ratio of the operation time that has elapsed since the installation or maintenance of the heat source unit to the operation time that is the actual operation time of the heat source unit from the time of installation or maintenance A heat source unit system that determines a heat source unit to be operated and a heat source unit to be stopped.   A heat source machine to be operated and a heat source machine to be stopped based on a value obtained by multiplying a predetermined reference operation time ratio for each heat source machine by the operation time and an operation remaining time which is a difference between an actual operation time and The heat source apparatus system according to claim 1, wherein:   3. The heat source system according to claim 2, wherein an alarm is issued when the operation time ratio falls below a specified value or when the remaining operation time exceeds a specified value.   4. The heat source apparatus system according to claim 2, wherein the heat source apparatus is operated from a heat source apparatus having a small operation time ratio or a heat source apparatus having a large operation remaining time, and is stopped from the heat source apparatus having a small operation remaining time.   5. The heat source apparatus system according to claim 1, wherein during operation of the heat source apparatus, the heat source apparatus having a short remaining operation time is stopped and the many heat source apparatuses are operated.   When it is estimated that energy consumption will decrease by increasing the number of operating heat source units, the operating time ratio of the heat source unit to be operated exceeds the preset value or the remaining operating time is below 6. The heat source device is operated when the operation time ratio is lower than the operation time ratio or when the remaining operation time is higher. Heat source machine system.   When using a compression heat source machine that uses an inverter-controlled compressor as a heat source machine, the operation time is a value obtained by multiplying the actual operation time by the operation rotation speed at that time and integrating the operation time. The heat source machine system according to any one of claims 1 to 6, wherein the operation time is defined as an equivalent operation time.   The heat source machine system according to any one of claims 2 to 7, wherein the heat source machine having a short reference operation time ratio is preferentially operated. In the operation method of a heat source machine that operates and stops a plurality of heat source machines,
Based on the operation time ratio defined as the ratio of the operation time that has elapsed since the installation or maintenance of the heat source unit to the operation time that is the actual operation time of the heat source unit from the time of installation or maintenance A method of operating a heat source machine, comprising: determining a heat source machine to be operated and a heat source machine to be stopped.   A heat source machine to be operated and a heat source machine to be stopped based on a value obtained by multiplying a predetermined reference operation time ratio for each heat source machine by the operation time and an operation remaining time which is a difference between an actual operation time and The operation method of the heat source machine according to claim 9, wherein:   The operation method of the heat source unit according to claim 10, wherein an alarm is issued when the operation time ratio falls below a specified value or when the remaining operation time exceeds a specified value.   The operation method of the heat source apparatus according to claim 10 or 11, wherein the heat source apparatus is operated from a heat source apparatus having a small operation time ratio or a heat source apparatus having a long operation remaining time, and is stopped from the heat source apparatus having a small operation remaining time.   The operation method of the heat source unit according to any one of claims 9 to 12, wherein during the operation of the heat source unit, the heat source unit having a short remaining operation time is stopped and the many heat source units are operated.   When it is estimated that energy consumption will decrease by increasing the number of operating heat source units, the operating time ratio of the heat source unit to be operated exceeds the preset value or the remaining operating time is below 14. The heat source machine is operated when the operation time ratio is lower than the operation time ratio or when the remaining operation time exceeds the operation time. How to operate the heat source machine.   When using a compression heat source machine that uses an inverter-controlled compressor as a heat source machine, the operation time is a value obtained by multiplying the actual operation time by the operation rotation speed at that time and integrating the operation time. The operation method of a heat source machine according to any one of claims 9 to 14, wherein the operation time is defined as an equivalent operation time.   The heat source unit operation method according to any one of claims 10 to 15, wherein the heat source unit having a short reference operation time ratio is preferentially operated. In a control device for a heat source system that operates and stops a plurality of heat source units,
The control device is an operation defined as a ratio of an operation time that is the time elapsed since the installation or maintenance of the heat source unit to an operation time that is the actual operation time of the heat source unit from the installation or maintenance time. A control device for a heat source system that determines a heat source machine to be operated and a heat source machine to be stopped based on a time ratio.   The control device is a heat source machine to be operated based on a value obtained by multiplying a predetermined reference operation time ratio for each heat source machine by the operation time and an operation remaining time which is a difference between an actual operation time and 18. The control device for a heat source unit system according to claim 17, wherein the heat source unit to be stopped is determined.   The control device for a heat source system according to claim 18, wherein the control device issues an alarm when the operation time ratio falls below a specified value or when the remaining operation time exceeds a specified value.   The heat source according to claim 18 or 19, wherein the control device is operated from a heat source device having a small operation time ratio or a heat source device having a long operation remaining time, and is stopped from the heat source device having a small operation remaining time. Control device for machine system.   The heat source unit system according to any one of claims 17 to 20, wherein the control device stops a heat source unit with a short remaining operation time and operates a large number of heat source units during operation of the heat source unit. Control device.   When it is estimated that the energy consumption is reduced by increasing the number of operating heat source units, the control device exceeds the preset value of the operating time ratio of the heat source unit to be operated or the remaining operation time. The operation is not performed when the time is below, and the heat source unit is operated when the operation time ratio is below or the remaining operation time is above. The control device of the heat source machine system according to Item 1.   When the control device uses a compression heat source machine that uses an inverter-controlled compressor as a heat source machine, the operation time is multiplied by the operation rotational speed at that time as the operation time. The control device for a heat source unit system according to any one of claims 17 to 22, wherein the operation time is defined as an equivalent operation time which is an integrated value.   The control device for a heat source unit system according to any one of claims 18 to 23, wherein the control unit is configured to preferentially operate a heat source unit having a short reference operation time ratio.

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