Operation priority determination method

Abstract

To provide an operation priority determination method capable of easily determining a combination of heat source machines with low power consumption.SOLUTION: Determining a combination of the plurality of types of heat source machines in a case where only the cooling operation is performed, a combination of the plurality of types of heat source machines in a case where only the heating operation is performed, and a combination of the plurality of types of heat source machines in a case where the cooling operation and the heating operation are simultaneously performed; Creating, for each of the combinations, a matrix diagram with power consumption with respect to a cooling output in a case of performing only a cooling operation of the combined plurality of types of heat source machines as one element and power consumption with respect to a heating output in a case of performing only a heating operation as the other element, and comparing the matrix diagrams for the respective combinations with each other to select a combination of the plurality of types of heat source machines to be prioritized.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a method for determining the operation priority order of a plurality of types of heat source machines used in an air conditioning system. [Background technology]

[0002] For example, air conditioning systems used in buildings such as office buildings, commercial buildings, and accommodation facilities are known that are configured to include multiple types of heat source units that can perform cooling and heating operations and have different power consumption relative to output, depending on the purpose and size of the building (see, for example, Patent Document 1).

[0003] In such air conditioning systems, the priority of operation of multiple types of heat source machines is generally determined so as to reduce power consumption by focusing only on cooling output in summer operating modes, and so as to reduce power consumption by focusing only on heating output in winter operating modes. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-176748 Summary of the Invention [Problem to be solved by the invention]

[0005] Some buildings require hot water even in summer and cold water even in winter. In such cases, among multiple types of heat source machines, one of the machines may perform cooling and heating operations simultaneously, or one machine may perform cooling while the other machine performs heating.

[0006] However, it has been difficult to prioritize the operation of these multiple types of heat source machines so that they perform cooling or heating operations in a combination that consumes the least amount of power.

[0007] The present invention has been made in consideration of such problems, and its purpose is to provide a method for determining operation priorities that can easily determine a combination of heat source machines that consumes less power. [Means for solving the problem]

[0008] The method for determining operational priorities of the present invention is a method for determining operational priorities of multiple types of heat source machines in an air conditioning system equipped with multiple types of heat source machines that have different power consumption relative to their output, and is characterized by determining combinations of multiple types of heat source machines when only cooling operation is performed, combinations of multiple types of heat source machines when only heating operation is performed, and combinations of multiple types of heat source machines when cooling operation and heating operation are performed simultaneously, creating a matrix diagram for each combination in which the power consumption relative to cooling output when only cooling operation is performed for the combined multiple types of heat source machines is one element and the power consumption relative to heating output when only heating operation is performed is the other element, and comparing the matrix diagrams for each combination to select a combination of multiple types of heat source machines that is prioritized.

[0009] In the above-described configuration, the operational priority determination method of the present invention preferably creates a seasonal matrix diagram using actual power consumption data obtained for each season as one of the elements and the other of the elements, and selects a prioritized combination of multiple types of heat source machines for each season.

[0010] In the above-described configuration, the operational priority determination method of the present invention preferably creates a matrix diagram for daytime and nighttime using actual power consumption data obtained during the day and night for one of the elements and the other of the elements, and selects a prioritized combination of multiple types of heat source machines for daytime and nighttime.

[0011] In the operation priority determination method of the present invention, in the above-mentioned configuration, it is preferable that the computer creates the matrix diagram based on data on power consumption relative to cooling output when only cooling operation is performed and data on power consumption relative to heating output when only heating operation is performed. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide an operation priority order determination method that can easily determine a combination of heat source machines with low power consumption. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a heat source flow diagram of an air conditioning system to which an operation priority determination method according to an embodiment of the present invention is applied. [Figure 2] FIG. 4 is a characteristic diagram showing the relationship between the cooling / heating output and power consumption of the first heat source unit. [Figure 3] FIG. 10 is a characteristic diagram showing the relationship between the cooling / heating output and power consumption of the second heat source unit. [Figure 4] FIG. 10 is a characteristic diagram showing the relationship between the cooling / heating output and power consumption of the third heat source unit. [Figure 5] FIG. 10 is a diagram showing combinations of operations of three types of heat source machines when only cooling operation is performed. [Figure 6] FIG. 10 is a diagram showing combinations of operations of three types of heat source machines when only heating operation is performed. [Figure 7] FIG. 10 is a diagram showing combinations of operations of three types of heat source machines when cooling operation and heating operation are performed simultaneously. [Figure 8] FIG. 8 is a matrix diagram showing power consumption in the case of “cooling (1)×heating (1)” shown in FIG. 7. [Figure 9] FIG. 8 is a matrix diagram showing power consumption in the case of “cooling (2)×heating (3)” shown in FIG. 7. [Figure 10] FIG. 8 is a matrix diagram showing power consumption in the case of “cooling (3)×heating (2)” shown in FIG. 7. [Figure 11]FIG. 8 is a matrix diagram showing power consumption in the case of "cooling (5)" or "heating (4)" shown in FIG. 7. [Figure 12] FIG. 12 is a diagram showing a combination of heat source machines with low power consumption selected based on the matrix diagrams shown in FIGS. 8 to 11. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an example of an operation priority order determining method according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0015] An operation priority determination method according to one embodiment of the present invention is applied to an air conditioning system 1 shown in Fig. 1. This air conditioning system 1 has a cooling function and a heating function, and can be used in buildings (not shown) such as office buildings, commercial buildings, and accommodation facilities.

[0016] In this embodiment, the air conditioning system 1 includes three types of heat source units, namely a first heat source unit 11, a second heat source unit 12, and a third heat source unit 13, which have different power consumption relative to their output.

[0017] The first heat source unit 11 is a simultaneous hot and cold water extraction type air-cooled heat pump chiller (shown as a "heat recovery HP" in Figure 2 and subsequent figures). The first heat source unit 11 is connected to an air conditioner or the like 15 via a cold water side circuit-like piping 11a and cooling side headers 14a, 14b, and is also connected to an air conditioner or the like 15 via a hot water side circuit-like piping 11b and heating side headers 16a, 16b. The first heat source unit 11 can be operated by selecting either a cooling output (supply of cold water) or a heating output (supply of hot water), and can also be operated to perform both a cooling output (supply of cold water) and a heating output (supply of hot water) simultaneously. In other words, the first heat source unit 11 can supply both cold water and hot water to the air conditioner or the like 15 simultaneously or selectively.

[0018] The first heat source unit 11 has a dedicated cooling capacity of 117 kW, and is capable of supplying 209 liters of chilled water cooled from 18°C ​​to 10°C per minute. The first heat source unit 11 also has a dedicated heating capacity of 95 kW, and is capable of supplying 152 liters of hot water heated from 41°C to 50°C per minute. The power supply capacity of the first heat source unit 11 is 3φ-200V, 39.7 kW.

[0019] The relationship between the cooling output and power consumption of the first heat source unit 11 and the relationship between the heating output and power consumption are shown in Figure 2. Note that these values ​​assume that there is no change in power consumption when the cooling output and heating output are both less than approximately 20%. Furthermore, the power consumption when cold water and hot water are drawn out simultaneously is set to the larger of the power consumption for cooling output and the power consumption for heating output.

[0020] The second heat source unit 12 is an air-cooled heat pump chiller (shown as "air-cooled HP" in Figure 2 and subsequent figures). The second heat source unit 12 is connected to an air conditioner or the like 15 by a circuit-like piping 12a on the chilled water side and cooling-side headers 14a, 14b, and is also connected to the air conditioner or the like 15 by a circuit-like piping 12b on the hot water side and heating-side headers 16a, 16b. The second heat source unit 12 is operated by selecting either a cooling output (supply of chilled water) or a heating output (supply of hot water). In other words, the second heat source unit 12 can selectively supply either chilled water or hot water to the air conditioner or the like 15.

[0021] The second heat source unit 12 has a dedicated cooling capacity of 43 kW and is capable of supplying 77 liters per minute of chilled water cooled from 18°C ​​to 10°C. The second heat source unit 12 has a dedicated heating capacity of 31 kW and is capable of supplying 49 liters per minute of hot water heated from 41°C to 50°C. The power supply capacity of the second heat source unit 12 is 3φ-200V, 15.0 kW.

[0022] The relationship between the cooling output and power consumption of the second heat source unit 12 and the relationship between the heating output and power consumption are shown in Figure 3. Note that these values ​​are based on the assumption that there is no change in power consumption when the cooling output and heating output are both less than approximately 10%.

[0023] The third heat source unit 13 is a geothermal air-cooled hybrid heat pump chiller (shown as "geothermal HP" in Figure 2 and subsequent figures). The third heat source unit 13 is connected to an air conditioner 15 via a chilled water side circuit-like piping 13a, a heat exchanger 17a, and cooling side headers 14a and 14b, and is also connected to the air conditioner 15 via a hot water side circuit-like piping 13b, a heat exchanger 17b, and heating side headers 16a and 16b. The third heat source unit 13 is operated by selecting either a cooling output (supply of chilled water) or a heating output (supply of hot water). In other words, the third heat source unit 13 can selectively supply either chilled water or hot water to the air conditioner 15. Note that although Figure 1 shows only one third heat source unit 13, three third heat source units 13 are configured to operate in parallel in the same mode (cooling mode or heating mode) simultaneously.

[0024] The cooling capacity of the three third heat source units 13 is 27 kW in total, and they have the capacity to supply 48 liters per minute of chilled water cooled from 15°C to 7°C. The heating capacity of the three third heat source units 13 is 33 kW in total, and they have the capacity to supply 53 liters per minute of hot water heated from 44°C to 53°C. Furthermore, the power supply capacity of the three second heat source units 12 is 1φ-200V, 15.5 kW in total.

[0025] The relationship between the cooling output and power consumption of the third heat source unit 13 and the relationship between the heating output and power consumption are shown in Figure 4. Note that these values ​​are based on the assumption that there is no change in power consumption when both the cooling output and the heating output are less than approximately 20%.

[0026] As described above, in this embodiment, the cooling-only capacity and heating-only capacity of the first heat source unit 11 are greater than the cooling-only capacity and heating-only capacity of the second heat source unit 12 and the cooling-only capacity and heating-only capacity of the third heat source unit 13.

[0027] In addition, the first heat source unit 11, the second heat source unit 12 and the third heat source unit 13 are not limited to the above-mentioned types, configurations or specifications, and may be of other types, configurations or specifications as long as the power consumption relative to the output is different from each other.

[0028] The air conditioner 15 may be, for example, a general air conditioner, an outdoor air processing air conditioner, a desiccant outdoor air conditioner, a fan coil unit, etc. The air conditioning system 1 may be configured to include an active chilled beam 18 connected between the air conditioner 15 and the cooling-side header 14b and between the air conditioner 15 and the heating-side header 16b. The air conditioning system 1 may also be configured to include a preheating tank 19 connected in parallel to the air conditioner 15 via a heat exchanger 19a between the heating-side header 16a and the heating-side header 16b.

[0029] Next, we will explain the procedure for determining the operational priorities of the three types of first heat source units 11, second heat source units 12, and third heat source units 13 in an air conditioning system 1 having the above configuration, using an operational priority determination method according to one embodiment of the present invention, so that the first heat source unit 11, second heat source unit 12, and third heat source unit 13 are operated in cooling and heating mode in a combination that consumes the least amount of power.

[0030] First, the combination of the first heat source unit 11, the second heat source unit 12 and the third heat source unit 13 when only cooling operation is performed, the combination of the first heat source unit 11, the second heat source unit 12 and the third heat source unit 13 when only heating operation is performed, and the combination of the first heat source unit 11, the second heat source unit 12 and the third heat source unit 13 when cooling operation and heating operation are performed simultaneously are determined.

[0031] In this embodiment, the target range of cooling output and heating output that determines the priority of operation of the three types of first heat source unit 11, second heat source unit 12, and third heat source unit 13 is set to a range that can be covered only by the first heat source unit 11, which has the highest individual output (cooling output 100 kW, heating output 90 kW).

[0032] Specifically, first, the combination of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 when only cooling operation is performed is determined. The first heat source unit 11 can cover the entire range of cooling output when operated alone. In contrast, the second heat source unit 12 and the third heat source unit 13 cannot cover the entire range of cooling output when operated alone, and after the output reaches its maximum value, the other heat source unit must be operated in follow-up mode. Furthermore, even when the second heat source unit 12 and the third heat source unit 13 are operated in parallel, they cannot cover the entire range of cooling output, and after the output of the second heat source unit 12 and the output of the third heat source unit 13 reach their maximum values, the first heat source unit 11 must be operated in follow-up mode. Therefore, when only cooling operation is performed, the combinations of the first heat source unit 11, the second heat source unit 12 and the third heat source unit 13 are determined in five ways, as shown in Figure 5: "Cooling (1)", which is the operation of the first heat source unit 11 alone; "Cooling (2)", which is the operation of the second heat source unit 12 and the follow-up operation of the first heat source unit 11; "Cooling (3)", which is the operation of the third heat source unit 13 and the follow-up operation of the first heat source unit 11; "Cooling (4)", which is the operation of the second heat source unit 12 and the follow-up operation of the third heat source unit 13 and the first heat source unit 11; and "Cooling (5)", which is the operation of the third heat source unit 12 and the follow-up operation of the second heat source unit 12 and the first heat source unit 11.

[0033] It should be noted that the areas enclosed by dashed lines in FIG. 5 overlap with other areas in FIG. 5 and can therefore be ignored in the comparison of power consumption described below.

[0034] Next, as in the case of cooling operation, the combination of the first heat source machine 11, the second heat source machine 12, and the third heat source machine 13 when only heating operation is performed is determined. When only heating operation is performed, the combination of the first heat source machine 11, the second heat source machine 12, and the third heat source machine 13 is determined in five ways, as shown in Figure 6: "heating (1)" in which the first heat source machine 11 is operated alone, "heating (2)" in which the second heat source machine 12 is operated and the first heat source machine 11 is operated in a follow-up manner, "heating (3)" in which the third heat source machine 13 is operated and the first heat source machine 11 is operated in a follow-up manner, "heating (4)" in which the second heat source machine 12 is operated and the third heat source machine 13 and the first heat source machine 11 are operated in a follow-up manner, and "heating (5)" in which the third heat source machine 12 is operated and the second heat source machine 12 and the first heat source machine 11 are operated in a follow-up manner.

[0035] It should be noted that the areas enclosed by dashed lines in FIG. 6 overlap with other areas in FIG. 6, and can therefore be ignored in the comparison of power consumption described below.

[0036] Next, a combination of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 when cooling operation and heating operation are performed simultaneously is determined. The combination when cooling operation and heating operation are performed simultaneously can be determined based on a matrix diagram of combinations "cooling (1)" to "cooling (5)" when only cooling operation is performed and combinations "heating (1)" to "heating (5)" when only heating operation is performed, as shown in Fig. 7.

[0037] Among the combinations shown in Figure 7, the combinations of "cooling (4)", "cooling (5)" and "heating (4)", "heating (5)" use three types of heat source units for cooling or heating only, and are therefore unsuitable as combinations for simultaneous cooling and heating operations. Furthermore, within the range of cooling output and heating output that the first heat source unit 11 can handle in standalone operation, combinations in which other heat source units are added to the first heat source unit 11 and operated in parallel clearly increase power consumption, so the combinations of "cooling (1)" and "heating (2)", "cooling (1)" and "heating (3)", "heating (1)" and "cooling (2)", and "heating (1)" and "cooling (3)" can be excluded from the perspective of selecting combinations with low power consumption. Therefore, in this embodiment, when cooling operation and heating operation are performed simultaneously, the combinations of the first heat source unit 11, the second heat source unit 12 and the third heat source unit 13 are determined in three ways: "Cooling (1) x Heating (1)", "Cooling (2) x Heating (3)", and "Cooling (3) x Heating (2)" as shown in Figure 7.

[0038] From the above, in this embodiment, the combinations of heat source machines that need to be compared to select a combination of heat source machines with low power consumption can be covered by ``Cooling (1) x Heating (1),'' ``Cooling (2) x Heating (3),'' ``Cooling (3) x Heating (2),'' ``Cooling (5),'' and ``Heating (4).''

[0039] Next, for each combination of heat source machines determined by the above procedure, a matrix diagram is created in which the power consumption relative to the cooling output when only cooling operation is performed for the combined first heat source machine 11, second heat source machine 12, and third heat source machine 13 is used as one element, and the power consumption relative to the heating output when only heating operation is performed is used as the other element.

[0040] A matrix diagram of the combination of "Cooling (1) x Heating (1)" is shown in Fig. 8, a matrix diagram of the combination of "Cooling (2) x Heating (3)" is shown in Fig. 9, a matrix diagram of the combination of "Cooling (3) x Heating (2)" is shown in Fig. 10, and a matrix diagram of the combination of "Cooling (5)" and "Heating (4)" is shown in Fig. 11. For the sake of convenience, the matrix diagrams shown in Figs. 8 to 11 omit the specific numerical values ​​of the power consumption in each column.

[0041] In each matrix diagram, the cooling output ranges from 0 kW to 100 kW in 5 kW increments, and the heating output ranges from 0 kW to 90 kW in 5 kW increments. In each matrix diagram, one element listed on the horizontal axis is the cooling output, and the power consumption relative to the cooling output when the combination of heat source machines performs only cooling operation is listed. Meanwhile, in each matrix diagram, the other element listed on the vertical axis is the heating output, and the power consumption relative to the heating output when the combination of heat source machines performs only heating operation is listed. The power consumption of the cooling output or heating output of the first heat source machine 11 at partial load can be calculated by multiplying the maximum output by the partial load ratio based on the characteristic diagram shown in Figure 2. Similarly, the power consumption of the cooling output or heating output of the second heat source unit 12 at partial load can be calculated by multiplying the maximum output by the ratio of the partial load based on the characteristic diagram shown in Figure 3, and the power consumption of the cooling output or heating output of the third heat source unit 13 at partial load can be calculated by multiplying the maximum output by the ratio of the partial load based on the characteristic diagram shown in Figure 4. Furthermore, in the matrix diagram of the "cooling (1) x heating (1)" combination shown in Figure 8, the power consumption in columns other than the horizontal axis column and the vertical axis column is the larger of the power consumption in the cooling output and the power consumption in the heating output, and in the matrix diagram of the "cooling (2) x heating (3)" combination shown in Figure 9 and the matrix diagram of the "cooling (3) x heating (2)" combination shown in Figure 10, the power consumption in columns other than the horizontal axis column and the vertical axis column can be calculated as the sum of the power consumption in the corresponding horizontal axis column and the power consumption in the corresponding vertical axis column.

[0042] In this embodiment, data on power consumption relative to cooling output when only cooling operation is performed and data on power consumption relative to heating output when only heating operation is performed for each combination of heat source machines are input into a computer (not shown), such as a personal computer, on which spreadsheet software is installed.The personal computer then automatically calculates the power consumption values ​​for the other columns based on the data on power consumption relative to cooling output when only cooling operation is performed and the data on power consumption relative to heating output when only heating operation is performed for each combination of heat source machines, and creates a matrix diagram.

[0043] Once multiple matrices have been created using the above procedure, the matrices for each combination of heat source machines are compared to select three preferred combinations of heat source machines. That is, for each matrix corresponding to a combination of heat source machines, the power consumption values ​​in the same cooling output and heating output columns are compared, and the combination of heat source machines corresponding to the matrix with the lowest power consumption is selected as a general rule.

[0044] The results of comparing the power consumption values ​​in the columns of the matrix diagrams shown in Figures 8 to 11 where the cooling output and heating output are the same are shown by hatching sloping downward to the left in the column where the power consumption is the smallest among the columns of the matrix diagrams where the cooling output and heating output are the same, and by hatching sloping downward to the right in the column where the power consumption is the largest. In Figures 8 to 11, columns where there is no corresponding power consumption are marked with an x.

[0045] Based on the results of the above comparison, the combination of heat source machines corresponding to the matrix diagram with the lowest power consumption is selected as the combination to be operated with priority, in principle.

[0046] For example, in the matrix diagram of the "cooling (1) x heating (1)" combination shown in FIG. 8, the range indicated by range A1 in FIG. 8 is selected as a combination when only cooling operation is performed, the range indicated by range B1 in FIG. 8 is selected as a combination when only heating operation is performed, and the range indicated by range C1 in FIG. 8 is selected as a combination when cooling operation and heating operation are performed simultaneously. Furthermore, in the matrix diagram of the "cooling (2) x heating (3)" combination shown in FIG. 9, combinations when only cooling operation is performed are not selected, the range indicated by range B2 in FIG. 9 is selected as a combination when only heating operation is performed, and the range indicated by range C2 in FIG. 9 is selected as a combination when cooling operation and heating operation are performed simultaneously. Furthermore, in the matrix diagram of the "cooling (3) x heating (2)" combination shown in FIG. 10, the range indicated by range A3 in FIG. 10 is selected as a combination when only cooling operation is performed, and combinations when only heating operation is performed or when cooling operation and heating operation are performed simultaneously are not selected. Furthermore, in the matrix diagram of the combinations of "cooling (5)" and "heating (4)" shown in Figure 11, the range shown by range A4 in Figure 11 is selected as a combination when only cooling operation is performed, the range shown by range B4 in Figure 11 is selected as a combination when only heating operation is performed, and combinations when cooling operation and heating operation are performed simultaneously are not selected.

[0047] In this embodiment, the combination of heat source machines corresponding to the matrix diagram with the smallest power consumption is selected as a general rule, but for the purpose of using it to control the increase / decrease in the number of stages of the heat source machine, a range that does not include part of the column with the smallest power consumption among multiple matrix diagrams is selected.

[0048] From the above, in this embodiment, for each of the cases where only cooling operation is performed, only heating operation is performed, and cooling operation and heating operation are performed simultaneously, the combination of three types of heat source machines to be prioritized is selected as shown in Figure 12.

[0049] That is, when only cooling operation is performed (when the heating output is 0 kW), the standalone operation of the third heat source unit 13 is selected when the required cooling output is in the range of 5 to 25 kW, the combined operation of the second heat source unit 12 and the third heat source unit 13 is selected when the required cooling output is in the range of 30 to 65 kW, and the standalone operation of the first heat source unit 11 is selected when the required cooling output is in the range of 70 to 100 kW. Also, when only heating operation is performed (when the cooling output is 0 kW), the standalone operation of the third heat source unit 13 is selected when the required heating output is in the range of 5 to 25 kW, the combined operation of the second heat source unit 12 and the third heat source unit 13 is selected when the required heating output is in the range of 30 to 50 kW, and the standalone operation of the first heat source unit 11 is selected when the required heating output is in the range of 55 to 90 kW. Furthermore, when cooling operation and heating operation are performed simultaneously, combined operation of the second heat source unit 12 and the third heat source unit 13 is selected when the required cooling output is in the range of 5 to 25 kW and the required heating output is in the range of 5 to 25 kW, and single operation of the first heat source unit 11 is selected in other ranges.

[0050] In this way, the operation priority determination method according to this embodiment determines combinations of three types of heat source machines when only cooling operation is performed, combinations of three types of heat source machines when only heating operation is performed, and combinations of three types of heat source machines when cooling operation and heating operation are performed simultaneously. For each combination, a matrix diagram is created in which the power consumption relative to the cooling output when only cooling operation is performed for the combined three types of heat source machines is used as one element, and the power consumption relative to the heating output when only heating operation is performed is used as the other element. The matrix diagrams for each combination are compared to select the combination of three types of heat source machines that is given priority, so that a combination of heat source machines with the lowest power consumption can be easily determined.

[0051] The air conditioning system 1 is equipped with a control device (not shown) that comprehensively controls the operation of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13. A combination of heat source units with low power consumption selected in the operation priority determination method according to this embodiment is incorporated into the control program of this control device. The control device is then configured to control the operation of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 in accordance with the combination of heat source units with low power consumption selected in the operation priority determination method according to this embodiment.

[0052] More specifically, when only cooling operation is performed, the control device of the air conditioning system 1 controls the operation of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 so that if the required cooling output is smaller than the maximum cooling output of the third heat source unit 13, the third heat source unit 13 is operated for cooling alone, if the required cooling output exceeds the maximum cooling output of the third heat source unit 13, a second heat source unit 12 is added and the second heat source unit 12 and the third heat source unit 13 are operated for cooling in parallel, and if the required cooling output exceeds the sum of the maximum cooling output of the second heat source unit 12 and the maximum cooling output of the third heat source unit 13, the first heat source unit 11 is operated for cooling alone. In addition, when only heating operation is performed, the control device of the air conditioning system 1 controls the operation of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 so that if the required heating output is smaller than the maximum cooling output of the third heat source unit 13, the third heat source unit 13 is operated for cooling alone, if the required heating output exceeds the maximum heating output of the third heat source unit 13, a second heat source unit 12 is added and the second heat source unit 12 and the third heat source unit 13 are operated for heating in parallel, and if the required heating output exceeds the sum of the maximum heating output of the second heat source unit 12 and the maximum heating output of the third heat source unit 13, the first heat source unit 11 is operated for heating alone. Furthermore, when cooling operation and heating operation are performed simultaneously, the control device of the air conditioning system 1 controls the operation of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 so that, if the required cooling output is smaller than the maximum cooling output of the second heat source unit 12 and the required heating output is smaller than the maximum heating output of the third heat source unit 13, the second heat source unit 12 is operated in cooling operation alone while the third heat source unit 13 is operated in heating operation alone, and if the required cooling output exceeds the maximum cooling output of the second heat source unit 12 or the required heating output exceeds the maximum heating output of the third heat source unit 13, the control device controls the operation of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 so that the first heat source unit 11 is operated in heating and cooling operation alone.

[0053] In addition, taking into consideration the reliability of operation, the leveling of operating times, and the need for intermittent operation of the geothermal heat exchanger in the third heat source unit 13, the second heat source unit 12 may be operated with priority over the third heat source unit 13.

[0054] With this type of control, even if the air conditioner etc. 15 requires hot water in addition to cold water in the summer, or cold water in addition to hot water in the winter, it is possible to operate the first heat source unit 11, the second heat source unit 12 and the third heat source unit 13 in a combination of heat source units with low power consumption according to the requirement, thereby reducing the power consumption of the air conditioning system 1.

[0055] In the method for determining operational priorities according to this embodiment, when creating the matrix diagrams shown in Figures 8 to 11, the actual measured data on the power consumption of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 obtained for each season can be used as one element and the other element of the matrix diagram to create a matrix diagram for each season, and a prioritized combination of the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 can be selected for each season.

[0056] This allows the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 to be operated in the combination that consumes the least amount of power for each season, thereby more effectively reducing the power consumption of the air conditioning system 1.

[0057] Furthermore, in the method for determining operational priorities according to this embodiment, when creating the matrix diagrams shown in Figures 8 to 11, the actual measured data on the power consumption of the first heat source unit 11, the second heat source unit 12 to the third heat source unit 13 obtained during the day and night can be used as one element and the other element of the matrix diagram to create matrix diagrams for each day and night, and a prioritized combination of the first heat source unit 11, the second heat source unit 12 to the third heat source unit 13 can be selected for each day and night.

[0058] This allows the first heat source unit 11, the second heat source unit 12, and the third heat source unit 13 to be operated in the combination that consumes the least amount of power during the day and at night, thereby more effectively reducing the power consumption of the air conditioning system 1.

[0059] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention.

[0060] For example, in this embodiment, the target range of cooling output and heating output that determines the priority of operation of the three types of first heat source machine 11, second heat source machine 12, and third heat source machine 13 is a range that can be covered only by the first heat source machine 11, which has the highest individual output (cooling output 100 kW, heating output 90 kW), but the results obtained within this range may be used to determine the priority of operation of the three types of first heat source machine 11, second heat source machine 12, and third heat source machine 13 outside this range.

[0061] In addition, in this embodiment, the priorities of operation of three types of heat source machines, the first heat source machine 11, the second heat source machine 12, and the third heat source machine 13, are determined, but the priorities of two types of heat source machines may be determined using a similar procedure, or the priorities of four or more types of heat source machines may be determined.

[0062] Furthermore, the configuration of the air conditioning system 1 is not limited to the configuration shown in FIG. [Explanation of symbols]

[0063] 1. Air conditioning system 11 1st heat source machine 11a Chilled water piping 11b Hot water piping 12 2nd heat source machine 12a Chilled water piping 12b Hot water piping 13 Third heat source machine 13a Chilled water piping 13b Hot water piping 14a Cooling side header 14b Cooling side header 15 Air conditioners, etc. 16a Heating side header 16b Heating side header 17a heat exchanger 17b Heat exchanger 18 Active Chilled Beam 19 Preheating tank 19a heat exchanger A1 range A3 range A4 range B1 range B2 range B4 range C1 range C2 Range

Claims

1. A method for determining the operation priority of a plurality of types of heat source machines in an air conditioning system having different power consumption relative to output, Determine a combination of the plurality of types of heat source machines when only cooling operation is performed, a combination of the plurality of types of heat source machines when only heating operation is performed, and a combination of the plurality of types of heat source machines when cooling operation and heating operation are performed simultaneously; For each combination, a matrix diagram is created in which the power consumption relative to the cooling output when only cooling operation is performed for the multiple types of combined heat source machines is used as one element, and the power consumption relative to the heating output when only heating operation is performed is used as the other element; An operation priority determination method characterized by comparing the matrix diagrams for each combination to select a combination of multiple types of heat source machines that takes priority.

2. The operational priority determination method of claim 1, wherein a matrix diagram for each season is created using actual power consumption data obtained for one of the elements and the other of the elements for each season, and a prioritized combination of multiple types of heat source machines is selected for each season.

3. 3. The method for determining operational priorities according to claim 1 or 2, wherein a matrix diagram is created for daytime and nighttime using actual power consumption data obtained for one of the elements and the other of the elements, and a prioritized combination of multiple types of heat source machines is selected for daytime and nighttime.

4. 2. The method for determining operational priorities according to claim 1, wherein the computer creates the matrix diagram based on data on power consumption relative to cooling output when only cooling operation is performed and data on power consumption relative to heating output when only heating operation is performed.

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