JP6322173B2 - Air conditioning system and air conditioning method - Google Patents

Description

  The present invention relates to an air conditioning system and an air conditioning method that harmonize indoor air.

  As an air conditioning system, a GHP (gas heat pump air conditioner) configured to include an engine driven compressor using a gas engine as a drive source, or an EHP (including an electric drive compressor using an electric motor as a drive source) Electric heat pump air conditioner) is adopted.

  Here, since the EHP does not include a gas engine, it is not necessary to perform maintenance such as replenishment and replacement of engine oil necessary for GHP, replacement of an oil filter, inspection and replacement of a spark plug, and the maintenance cost is not required. . On the other hand, GHP can heat the air by collecting the exhaust heat of the gas engine in addition to heating by the heat pump (heating the room air), so it can heat the room more efficiently than EHP. It becomes. In addition, since GHP consumes little power, there is an advantage that power consumption can be greatly reduced compared to EHP.

  Thus, GHP and EHP have different advantages. Therefore, a technique for deriving the operating load factor of EHP and GHP that minimizes the running cost based on the outside air temperature and the air conditioning load at every predetermined time while utilizing each advantage has been proposed (for example, Patent Documents). 1).

JP 2012-7834 A

  If the technique of deriving the operation load factor of EHP and GHP based on the outside air temperature and the air conditioning load as in Patent Document 1, for example, the EHP and the GHP are continuously used in the same trend at every predetermined control timing. In this case, the air conditioning control that predicts how much the power usage will be at the next power usage determination timing, and suppresses the operation load factor of the EHP when the value is likely to exceed the contract power. Will be done.

  However, in the above air conditioning control that predicts only the power consumption at the determination timing each time the control timing elapses, the fluctuation range of the operating load factor of EHP or GHP increases due to the control. If it does so, it will become impossible to drive | operate EHP and GHP with high efficiency, and the total charge of electric power and gas will become high as a result. Here, it is possible to reduce the fluctuation range of the operation load factor of EHP or GHP by simply shortening the control timing or subdividing the control threshold value, but increasing the processing load and the memory capacity. Will be invited.

  In view of such problems, the present invention has an object to provide an air conditioning system and an air conditioning method capable of operating EHP and GHP efficiently without causing an increase in arithmetic processing load and memory capacity. It is said.

In order to solve the above problems, an air conditioning system of the present invention includes at least an EHP having an electrically driven compressor that compresses a refrigerant using an electric motor as a drive source, and an engine that compresses the refrigerant using at least a gas engine as a drive source. And a GHP having a driven compressor, the charge of power is determined at least according to contracted power, the charge of gas is determined at least according to the amount of use of the gas, and the power in the facility excluding EHP and GHP The facility power transition deriving unit that derives the facility power transition that is the transition, the facility power transition estimating unit that estimates the future facility power transition from the past facility power transition and the predicted outside temperature in the future, and the future from the contract power The air conditioning power transition deriving unit for deriving the air conditioning power transition that is the power transition available for EHP and GHP, The basis, for each plurality of different air-conditioning load factor, the combination of ratably driving load factor of EHP and GHP to meet the air conditioning load factor and multiple product, the sum of the electricity and gas rates in the combination a combination which minimizes the EHP and GHP operation load ratio with respect to the air conditioning load factor, the operation map generator for generating an operation map that associates and the air conditioning load factor and EHP and GHP operation load ratio of, in accordance with an operation map, And an air conditioning operation unit that operates EHP and GHP at an operation load factor corresponding to a required air conditioning load factor.

In order to solve the above problems, another air conditioning system of the present invention includes at least an EHP having an electrically driven compressor that compresses a refrigerant using an electric motor as a drive source, and compresses the refrigerant using at least a gas engine as a drive source. A GHP having an engine-driven compressor, wherein a charge for power is determined at least according to contracted power, a charge for gas is determined according to at least the amount of gas used, and EHP and GHP at the facility are determined. Facility power transition deriving unit for deriving facility power transitions, excluding power transitions, facility power transition estimating unit for estimating future facility power transitions from past facility power transitions and future predicted outside temperatures, and contract power The air conditioning power transition deriving unit that subtracts the future facility power transition from the power and derives the air conditioning power transition that is the power transition that can be used in EHP and GHP, Based on each of the provided air conditioning power transitions, the EHP and GHP operating load factors are derived for each of a plurality of different air conditioning load factors so that the sum of the electricity and gas charges is minimized. An operation map generation unit that generates an operation map in which EHP and GHP operation load factors are associated with each other, and a plurality of operation maps are switched so that the power consumption actually measured in the facility is equal to or less than the contract power, and according to the operation map, And an air conditioning operation unit that operates EHP and GHP at an operation load factor corresponding to a required air conditioning load factor.

In order to solve the above-described problems, the system includes an EHP having an electric drive compressor that compresses refrigerant using at least an electric motor as a drive source, and a GHP having an engine drive compressor that compresses refrigerant using at least a gas engine as a drive source. In the air conditioning method of the present invention in the air conditioning system, the power charge is determined at least according to the contract power, the gas charge is determined at least according to the amount of gas used, and excludes EHP and GHP in the facility. The facility power transition, which is the power transition, is derived, the future facility power transition is estimated from the past facility power transition and the predicted outside temperature in the future, the future facility power transition is subtracted from the contract power, and EHP and GHP The air conditioning power transition, which is the power transition that can be used in the system, is derived, and based on the air conditioning power transition, EHP and GHP operation for the air conditioning load factor is generated by generating a plurality of combinations that distribute the operating load factors of EHP and GHP so as to satisfy the air conditioning load factor. Generate an operation map that associates the air conditioning load factor with the EHP and GHP operating load factors, and operates the EHP and GHP at the operating load factor corresponding to the required air conditioning load factor according to the operation map. It is characterized by.

In order to solve the above-described problems, the system includes an EHP having an electric drive compressor that compresses refrigerant using at least an electric motor as a drive source, and a GHP having an engine drive compressor that compresses refrigerant using at least a gas engine as a drive source. In another air conditioning method of the present invention in an air conditioning system, the charge of power is determined at least according to contracted power, the charge of gas is determined at least according to the amount of gas used, and EHP and GHP at the facility The facility power transition, which is the power transition excluding, is derived, the future facility power transition is estimated from the past facility power transition and the predicted outside temperature in the future, the future facility power transition is subtracted from the contract power, and the EHP and air conditioning power transition of a power transition available derived in GHP, based on the plurality of air conditioning power transition provided stepwise, different phases For each of a plurality of air conditioning load factors, an operation load factor of EHP and GHP is derived so that the sum of electric power and gas charges is minimized, and an operation in which the air conditioner load factor is associated with the operation load factors of EHP and GHP A map is generated , and multiple operation maps are switched so that the power consumption actually measured in the facility is less than or equal to the contract power, and according to the operation map, EHP and GHP are operated at an operation load factor corresponding to the required air conditioning load factor. It is characterized by doing.

  According to the present invention, it is possible to efficiently operate EHP and GHP without causing an increase in calculation processing load and memory capacity.

It is explanatory drawing which showed the connection relation of the air conditioning system. It is a figure for demonstrating the example which changes the driving load factor of each of EHP and GHP at any time. It is explanatory drawing which showed the relationship between the operating load factor and efficiency of EHP and GHP. It is a flowchart for demonstrating the flow of a process of an air conditioning method. It is explanatory drawing for demonstrating an air-conditioning electric power transition derivation | leading-out process. It is explanatory drawing which showed an example of the driving | running map. It is explanatory drawing for showing the determination procedure of a driving load factor. It is explanatory drawing for showing the determination procedure of a driving load factor. It is explanatory drawing which showed the other example of the driving | operation map. It is explanatory drawing for demonstrating an air conditioning driving | operation process.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Air conditioning system 100)
FIG. 1 is an explanatory diagram showing a connection relationship of the air conditioning system 100. The air conditioning system 100 is provided separately from the air conditioning apparatus 110 and the facility 10 that are arranged in a contract unit in the facility 10 such as a building or a school, and performs bidirectional communication with the air conditioning apparatus 110 wirelessly or by wire. The management server 120 is configured to be connected.

  The air conditioner 110 includes an EHP 112, a GHP 114, an air conditioning communication unit 116, and an air conditioning control unit 118. Here, for convenience of explanation, an example in which one EHP 112 and one GHP 114 are connected to one air conditioning control unit 118 will be described. However, the number of EHP 112 and GHP 114 is not limited, and a plurality of one air conditioning control unit 118 is provided. EHP 112 and GHP 114 may be connected.

  In the EHP 112, the refrigerant is circulated (refrigerant circuit) by an electrically driven compressor 142 that compresses the refrigerant using the electric motor 140 as a drive source, and heat exchange between the refrigerant and the outdoor air is performed in the outdoor EHP outdoor heat exchanger 144. In the indoor EHP indoor heat exchanger 146, heat exchange between the refrigerant and the indoor air is performed.

  In the GHP 114, the refrigerant is circulated by an engine-driven compressor 152 that compresses the refrigerant using the gas engine 150 as a driving source (refrigerant circuit), and heat exchange between the refrigerant and the outdoor air is performed in the outdoor GHP outdoor heat exchanger 154. In the indoor GHP indoor heat exchanger 156, heat exchange between the refrigerant and the indoor air is performed.

  The air conditioning communication unit 116 communicates with the management server 120. The air conditioning control unit 118 is configured by a semiconductor integrated circuit including a central processing unit (CPU), a ROM storing programs, a RAM as a work area, and the like, and controls the EHP 112 and the GHP 114. The air conditioning control unit 118 functions as the facility power transition transmission unit 170 and the air conditioning operation unit 172 by operating the program. The operation of each functional unit of the air conditioning control unit 118 will be described in detail later.

  The management server 120 includes a management communication unit 122, a data holding unit 124, and a management control unit 126. The management communication unit 122 communicates with the plurality of air conditioners 110. The data holding unit 124 includes a RAM, a flash memory, an HDD, and the like, and holds various information necessary for processing of each function unit of the management control unit 126. The management control unit 126 is constituted by a semiconductor integrated circuit including a central processing unit (CPU), a ROM storing a program, a RAM as a work area, and the like. By operating the program, the facility power transition deriving unit 178, It functions as a facility power transition estimating unit 180, an air conditioning power transition deriving unit 182 and an operation map generating unit 184. The operation of each functional unit of the management control unit 126 will be described in detail later.

  Next, the design concept of the operating load factors of the electric motor 140 of the EHP 112 and the gas engine 150 of the GHP 114 in the air conditioning system 100 will be described.

(Design concept for operating load factor)
The electric motor 140 constituting the EHP 112 generates driving force with electric power, and the gas engine 150 constituting the GHP 114 generates driving force with gas. Therefore, when both the EHP 112 and the GHP 114 are operated, both power and gas are required, and power and gas are purchased from a power supply company or a gas supply company.

  Electricity and gas charges are composed of a total of two charge systems: a basic charge as a basic and a pay-as-you-go charge determined according to a preset unit price and usage. However, the calculation of basic charge and metered charge differs between gas and electric power. For example, both the basic charge and the metered charge depend on the use amount, and the gas charge increases as the use amount increases. In general, the basic fee is higher for electricity than for gas, and the metered rate is often higher for gas than for electricity.

  On the other hand, the basic charge of power is determined based on contract power at the facility 10. Here, the contract power is based on the maximum demand power (maximum demand), which is the maximum value in a predetermined period (for example, 12 months) of demand power (demand), which is the average used power every predetermined time (for example, 30 minutes). Determined. However, the contract power is not limited to such a case, and there are various ways of determination such as determination by consultation with a supplier. Note that if power is used beyond the contracted power (when the maximum demand power is updated), the contract power for one year from that month is determined based on the updated maximum power demand. Charges will rise. In addition, when contract power is determined through discussion with a power supply company, a contract surplus may be imposed.

  Therefore, if the usage amount is the same as long as it does not exceed the contract power, the lower the basic charge (contract power), the lower the power charge (the sum of the basic charge and the metered charge). Therefore, it is desirable to reduce the contract power as much as possible. However, if the contract power is made too small, the frequency of usage exceeding the contract power will increase, and the basic charge will also increase, which may increase the power charge. Therefore, it is desirable to set the contract power appropriately small and apportion the necessary air conditioning load between the EHP 112 and the GHP 114 with the power consumption not exceeding the contract power.

  Here, the basic charge of power (contract power) is targeted for the following reason. That is, in general, when the basic charge for power and the basic charge for gas are compared, the basic charge for power is higher, so it is more advantageous to reduce the basic charge for power. Accordingly, in the present embodiment, an example is given in which the amount of power used is controlled so as not to exceed the contracted power, focusing only on the contracted power that is affected by the basic charge of power. Can also be targeted.

  FIG. 2 is a diagram for explaining an example in which the operation load factors of the EHP 112 and the GHP 114 are changed as needed. FIG. 2 (a) shows the transition of the power consumption of the entire facility, and FIG. 2 (b) shows the operating load factors of the EHP 112 and the GHP 114, respectively. Here, if the EHP 112 and GHP 114 continue to be used at the predetermined control timing (30 minutes / 4), the power usage amount will be determined at the next power usage determination timing (every 30 minutes). It is assumed that the air conditioning control is performed such that the operating load factor of the EHP 112 is suppressed when the value is predicted to exceed the contract power.

  For example, at the control timing at time point A in FIG. 2A, if the EHP 112 and GHP 114 are continuously used in this trend, the power consumption exceeds the contracted power at the determination timing at time point B as shown by the broken line. Therefore, the operating load factor of the EHP 112 is reduced as shown in FIG. However, in order to satisfy the required air conditioning load, the operating load factor of the GHP 114 is increased as shown by the one-dot chain line in FIG. Thus, for the first 30 minutes, the amount of power used falls within the contract power.

  After that, regarding the next 30 minutes, at the control timing at time point C in FIG. 2 (a), even if the EHP 112 continues to be used with the trend as it is, the power usage amount is at the determination timing at time point D as shown by the broken line. Since it can be predicted that it will be less than half of the contract power, the operating load factor of the EHP 112 is increased and the operating load factor of the GHP 114 is decreased as shown in FIG. Further, as shown in FIG. 2B, the operation load factor of the EHP 112 is decreased and the operation load factor of the GHP 114 is increased at the determination timing of the time point E so that the power consumption does not exceed the contract power.

  However, as described above, in the control in which only the power consumption at the determination timing (30 minutes) is predicted every time the control timing (30 minutes / 4) elapses, as shown in FIG. The fluctuation range of the operation load factor of the EHP 112 and the GHP 114 becomes large.

  FIG. 3 is an explanatory diagram showing the relationship between the operating load factor of the EHP 112 and the GHP 114 and the efficiency (COP). As can be understood with reference to FIG. 3, in both the EHP 112 and the GHP 114, the efficiency is the maximum at a specific operation load factor, and the difference between the actual operation load factor and the specific operation load factor at which the efficiency is the maximum is As it grows, the efficiency decreases. Here, as described above, in both the EHP 112 and the GHP 114, when the fluctuation range of the operation load factor becomes large, the operation with the operation load factor separated from the specific operation load factor increases. If it does so, it will become impossible to drive EHP112 and GHP114 with high efficiency, and, as a result, the total charge of electric power and gas will become high. At this time, it is possible to reduce the fluctuation range of the operation load factor of the EHP 112 and the GHP 114 by simply shortening the control timing or subdividing the control threshold, but the calculation processing load and the memory capacity are increased. Will be invited.

  Here, it is conceivable to predict the future power transition on a daily basis through the predicted outside air temperature in the future, such as the next day, and to control the operating load factors of the EHP 112 and GHP 114 accordingly. However, since the power changes depending on the EHP 112 and GHP 114 (simply referred to as “air conditioning power transition”) and the power transitions of facilities other than the EHP 112 and GHP 114 (simply referred to as “facility power transition”) are different, both are simply Even if predicted together, a difference from the actually required air conditioning load will occur.

  Therefore, the operation map is based on the assumption that the facility power transition and the air conditioning power transition are considered separately, the facility power transition is regarded as a quantitative fluctuation, estimated from the predicted outside temperature in the future, etc., and progressed with the predicted facility power transition Thus, the operating load factor of the EHP 112 and the GHP 114 is controlled each time according to the fluctuation of the air conditioning power transition. With such a configuration, it is possible to appropriately adjust the operation loads of the EHP 112 and the GHP 114 within a range in which the power consumption does not exceed the contract power while satisfying the required air conditioning load. Therefore, it is possible to efficiently operate by suppressing fluctuations in the operation load factor of the EHP 112 and the GHP 114 without causing an increase in arithmetic processing load and memory capacity, and it is possible to minimize the total fee.

(Air conditioning method)
FIG. 4 is a flowchart for explaining the flow of processing of the air conditioning method. Here, the air conditioning method includes a facility power transition transmission process (S200) for transmitting a power transition in the entire facility 10, and a facility power transition derivation process (S202) for deriving past facility power transitions excluding the EHP 112 and GHP 114 in the facility 10. The facility power transition estimation process for estimating the future facility power transition from the past facility power transition and the predicted outside temperature in the future (S204), subtracting the future facility power transition from the contract power, and used by the EHP 112 and GHP 114 Based on the air-conditioning power transition deriving process (S206) for deriving the air-conditioning power transition that is a possible power transition, and the air-conditioning power transition, the sum of the electric power and gas charges is minimized for each of a plurality of different air-conditioning load factors. The driving map generation process (S) for generating the driving map by deriving the driving load factors of the EHP 112 and the GHP 114 08), in accordance with an operation map, a EHP112 and GHP114, forward in the process of air-conditioning operation processing (S210) operating at operating load rate corresponding to the required air-conditioning load rate is performed.

(Facility power transition transmission processing S200)
The facility power transition transmission unit 170 measures the power transition of the entire facility 10 every 30 minutes, for example, and transmits it to the management server 120 together with the usage history of the EHP 112 and GHP 114 that are driven in parallel therewith.

(Facility power transition derivation process S202)
The facility power transition deriving unit 178 derives an estimated value of the power transition of the EHP 112 and the GHP 114 based on the usage history of the EHP 112 and the GHP 114, and the EHP 112 and the GHP 114 from the power transition in the entire facility 10 received from the facility power transition transmitting unit 170. Subtracting the estimated value of the power transition of the past, a plurality of past (for a plurality of days) facility power transitions that are power transitions excluding the EHP 112 are derived. The plurality of facility power transitions are associated with the outside temperature or the average outside temperature at each time of the day. Here, the air conditioners related to EHP 112 and GHP 114 are excluded from the facility power transition, but, for example, individually controlled air conditioners that are not related to EHP 112 and GHP 114 are included in the facility power transition. The facility power transition has a correlation with the outside temperature.

(Facility power transition estimation process S204)
The facility power transition estimation unit 180 calculates the future (next day) from the plurality of past facility power transitions derived by the facility power transition deriving unit 178 and the predicted outside temperature of the future to be estimated, for example, the predicted outside temperature of the next day. Estimate the facility power transition. Specifically, the outside air temperature associated with multiple past facility power transitions is compared with the predicted outside air temperature of the next day, and the past facility power transition that is the closest to the transition of the outside air temperature or the average outside air temperature is calculated. Derived as future facility power transition. Here, the past facility power transition to be referred to may be a facility power transition within a predetermined number of days (for example, seven days) from the present time, or may be a facility power transition in the same period last year or earlier. The future to be estimated is not limited to the next day, but may be a predetermined day after the next day when the outside air temperature can be predicted. As the facility power transition deriving method, various existing methods such as the energy consumption prediction method disclosed in Japanese Patent Application Laid-Open No. 2015-90639 can be used, and detailed description thereof is omitted here.

(Air conditioning power transition derivation process S206)
FIG. 5 is an explanatory diagram for explaining the air conditioning power transition deriving process S206. The air conditioning power transition deriving unit 182 subtracts the future (for example, the next day) facility power transition estimated by the facility power transition estimating unit 180 from the contract power for the facility 10, and is an air conditioning that is a power transition that can be used by the EHP 112 and the GHP 114. Derive power transition. This air conditioning power transition shows the upper limit value of power that can be used by the EHP 112 and the GHP 114 within the contract power regardless of the actually required air conditioning load.

(Driving map generation process S208)
Based on the air conditioning power transition, the operation map generation unit 184 has the EHP 112 and the EHP 112 and the gas charges so that the sum of the electric power and gas charges is minimized for a plurality of different air conditioning load factors (operating load factor of the EHP 112 + operating load factor of the GHP 114). An operation map is generated by deriving the operation load factor of the GHP 114.

  FIG. 6 is an explanatory diagram showing an example of an operation map. Here, the horizontal axis represents time, and the vertical axis represents the air conditioning load factor. Then, at all times, the operating load factors of the EHP 112 and the GHP 114 when all the assumed air conditioning load factors (≦ 10, ≦ 20,... ≦ 100%,> 100%) are requested are derived. For example, at 13:00 in FIG. 6, if the required air conditioning load factor is greater than 50% and 60% or less (≦ 60%), the operation load factor of the EHP 112 is set to 60%, and the operation load factor of the GHP 114 is set. 60% is set. Here, the operating load factors of the EHP 112 and the GHP 114 are obtained as follows.

7 and 8 are explanatory diagrams for illustrating the procedure for determining the operating load factor. However, the predicted outside temperature at 13:00 is 35 ° C, the power available to the EHP 112 and GHP 114 within the contracted power is 7 kW (determined from the air conditioning power transition), the power metered charge is 20 yen / kWh, and the gas metered charge is 100 yen / M ³ , EHP112 rated capacity is 28 kW, rated power consumption is 10 kW, GHP114 rated capacity is 56 kW, rated power consumption is 1 kW, rated gas consumption is 40 kW, and the required air conditioning load factor is 60%. . Here, a case where the EHP 112 and the GHP 114 are used for cooling is described, and different parameters are referred to when used for heating. In addition, the above-described charges (for example, electric power usage charges and gas usage charges) used in the operation map generation process S208 are fixedly determined or updated (changed) every predetermined time, and the operation map At the time of generating, the charge for the target period (for example, the next day) may be referred to and the driving map may be generated reflecting the updated charge. Thus, an appropriate operation map can be generated regardless of changes in the air-conditioning environment.

  First, in order to satisfy the required air conditioning load factor of 60%, as shown in FIG. 7, a plurality of combinations in which the operation load factors of the EHP 112 and the GHP 114 are prorated are listed. Specifically, the operation map generation unit 184 assigns the operation load factor of the EHP 112 to 0 to 100%, and multiplies the EHP 112 rating of 28 kW to derive each load. Here, since the requested air conditioning load is 50.4 kW obtained by multiplying 60% by the rating (EHP 112 rating 28 kW + GHP 114 rating 56 kW), the GHP 114 bears a load less than 50.4 kW. Therefore, the load of the GHP 114 is a value obtained by subtracting the load of the EHP 112 from 50.4 kW, and the ratio of the load of the GHP 114 to the rated 56 kW becomes the operating load factor of the GHP 114.

  Subsequently, the operation map generation unit 184 determines the relationship between the operation load factor (%) and the input ratio (input / rated) in FIG. 8A and the outside air temperature (° C.) and the input ratio in FIG. With reference to the relationship with (input / rated), the derived operating load factor of EHP 112 and GHP 114, rated power consumption of EHP 112, 10 kW, rated power consumption of 1 kW of GHP 114, rated gas consumption of 40 kW, and FIG. From the relationship (b), the power consumption of the EHP 112, the power consumption of the GHP 114, and the gas consumption of the GHP 114 are derived.

Next, the operation map generation unit 184 derives the total power consumption by adding the power consumption of the EHP 112 and the power consumption of the GHP 114, and multiplies the power consumption rate 20 yen / kWh by 0.5 hours to derive the power rate. . Similarly, the operation map generation unit 184 converts the gas consumed by the GHP 114 back into a volume, and derives a gas charge by multiplying the gas metered charge by 100 yen / m ³ and 0.5 hours. Finally, the operation map generation unit 184 derives a total charge by adding the power charge and the gas charge.

  Here, in consideration of the condition that the power that can be used by the EHP 112 and the GHP 114 within the contract power is 7 kW, the total power consumption is 7 kW or less in the combination corresponding to the operation load factor of the EHP 112 of 0 to 60%. Among them, the total charge of the combination of the operation load factor 60% of the EHP 112 and the operation load factor 60% of the GHP 114 is the minimum of 136 yen. Therefore, as shown in FIG. 6, the operation load factor of the EHP 112 at the required air conditioning load factor 60% at the time 13:00 is set to 60%, and the operation load factor of the GHP 114 is set to 60%. In this way, it is possible to set the operating load factors of the EHP 112 and the GHP 114 so that the sum of the electric power and gas charges is minimized with respect to a plurality of different air conditioning load factors.

  By the way, as described above, in this embodiment, the facility power transition and the air conditioning power transition are considered separately, the facility power transition is regarded as a quantitative fluctuation, estimated from the predicted outside temperature in the future, and the predicted facility power transition The operation load factor of the EHP 112 and the GHP 114 is controlled each time according to the change in the air conditioning power transition, based on the operation map on the assumption that the vehicle travels in the above. Therefore, if the power transition excluding EHP 112 and GHP 114 is in accordance with the facility power transition, that is, if the amount of power used changes with a primary curve (hereinafter simply referred to as “reference curve”) having a slope of contract power / 30 minutes. By simply controlling the operating load factors of the EHP 112 and the GHP 114, the power usage for a predetermined time (for example, 30 minutes) should be approximately equal to the contract power.

  However, if the actual power transition excluding EHP 112 and GHP 114 deviates from the facility power transition, even if the operating load factor of EHP 112 and GHP 114 is appropriately controlled, the power consumption will differ from the contract power. Therefore, in the present embodiment, a plurality of operation maps having different air-conditioning power transitions are prepared, and when the amount of power used deviates from the reference curve, the plurality of operation maps are switched to appropriately control to approach the reference curve.

  FIG. 9 is an explanatory diagram showing another example of the driving map. Again, the horizontal axis represents time, and the vertical axis represents the air conditioning load factor. Here, in addition to the facility power transition obtained by the facility power transition estimating unit 180, the air conditioning power transition deriving unit 182 is provided in stages in addition to the standard air conditioning power transition based on the case where the facility power transition varies. Further, a plurality of air conditioning power transitions are derived based on a plurality of (here, two) facility power transitions. And the operation map production | generation part 184 adds to the operation map shown in FIG. 6 based on air-conditioning electric power transition used as a reference | standard, as shown in FIG. A plurality of operation maps are generated based on the air conditioning power transition (two here).

  For example, the minus (−) level operation map shown in FIG. 9A is used when the facility power transition is lower than expected and the power consumption of the EHP 112 and GHP 114 can be increased. On the other hand, the + (plus) level operation map shown in FIG. 9B is used when the facility power transition is higher than expected and the power consumption of the EHP 112 and GHP 114 must be reduced. The switching control of the plurality of operation maps will be described in detail later. Here, for convenience of explanation, an example has been described in which an operation map in two steps, + and −, is prepared in addition to a reference operation map. However, the number and resolution of such operation maps can be arbitrarily set. .

(Air conditioning operation processing S210)
The air conditioning operation unit 172 operates the EHP 112 and the GHP 114 at an operation load factor corresponding to a required air conditioning load factor according to the operation map generated by the operation map generation unit 184. And the air-conditioning driving | operation part 172 switches a some driving | operation map for every predetermined time so that an electric power usage may become below contract electric power according to the electric power usage actually measured in the plant | facility.

  FIG. 10 is an explanatory diagram for explaining the air conditioning operation processing S210. The air conditioning operation unit 172 refers to the operation map at the reference level shown in FIG. 6 and determines the operation load factors of the EHP 112 and the GHP 114 according to the required air conditioning load factor at that time. Then, the operation map is reviewed at each control timing (for example, 10 seconds), and when the operation map is switched, the operation load factors of the EHP 112 and the GHP 114 are determined according to the switched operation map. The operation map switching determination is performed as follows. In other words, if EHP112 and GHP114 are continuously used in this trend, the amount of power usage will be predicted at the next power usage determination timing, and the value will be 90% or less of the contract power. 9 (a), switching to the -level operation map. When the contract power is greater than 90% and less than 100%, the operation is switched to the reference level operation map shown in FIG. When it becomes larger than%, the operation is switched to the + level operation map shown in FIG.

  For example, in the example of FIG. 10, it is desirable that the amount of power used indicated by a solid line changes on a reference curve indicated by a broken line. However, if the transition of the power consumption deviates from the reference curve and the tangent indicates 90% or less of the contract power at time A, the air conditioning operation unit 172 switches the operation map to the −level operation map. Thus, the amount of power used approaches the reference curve. When the tangent is greater than 90% of the contracted power and equal to or less than 100% at time B, the air conditioning operation unit 172 returns the operation map to the reference level operation map. When the tangent line becomes larger than 100% of the contract power at the time point C, the air conditioning operation unit 172 switches the operation map to the + level operation map. Thus, the amount of power used approaches the reference curve. Further, when the tangent is greater than 90% of the contract power and equal to or less than 100% at time D, the air conditioning operation unit 172 returns the operation map to the reference level operation map.

  With the configuration for switching the operation map, the power consumption is appropriately controlled so as to approach the reference curve. In this case, the target value of the power consumption is set to 95% of the contract power so that the power consumption does not exceed the reference curve, and finally it is larger than 90% of the contract power and within 100% or less. I have to.

  Thus, the following effects are produced by controlling the driving load factor between the EHP 112 and the GHP 114 using the driving map. In other words, in the present embodiment, the facility power transition and the air conditioning power transition are considered separately, and the EHP 112 and the GHP 114 are controlled in accordance with the required air conditioning load factor at that time on the assumption that the facility power transition changes quantitatively. Yes. Therefore, if the power transition excluding EHP112 and GHP114 is in line with the facility power transition, the power usage will change at a value close to the reference curve with high accuracy without predicting the power usage at the power usage determination timing. Will do.

  Even if the amount of power used deviates from the reference curve, it can be brought close to the reference curve quickly by switching a plurality of operation maps that are appropriately returned to the vicinity of the reference curve. Therefore, it is possible to efficiently operate by suppressing fluctuations in the operation load factor of the EHP 112 and the GHP 114, and to minimize the total fee.

  In addition, once the air-conditioning operation unit 172 acquires a plurality of operation maps, communication is not required until the period defined in the operation map ends, so the communication load with the management server 120 is minimized. Can do.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, in the above-described embodiment, when the EHP 112 and the GHP 114 are continuously used in the control timing as they are, the power usage amount is predicted at the next power usage determination timing, An example of so-called open control in which a plurality of operation maps are switched according to what percentage of the contract power corresponds to the value has been described. However, the control method is not limited to such a case, and at the next power usage determination timing, the amount of power usage is predicted, and the value is fed back, thereby closing control for contract power as a target. Various existing control methods such as (feedback control) can be employed.

  In the above-described embodiment, the EHP 112 and the GHP 114 are configured independently and each has an outdoor heat exchanger, an indoor heat exchanger, and a refrigerant circuit, but the present invention is not limited thereto. As long as the electric motor 140 and the electrically driven compressor 142 and the gas engine 150 and the engine driven compressor 152 are independent from each other, any one or a plurality of components are shared and configured integrally. Also good. For example, the EHP 112 and GHP 114 indoor heat exchangers and refrigerant circuits may be shared, and a hybrid type may be used, or the EHP 112 and GHP 114 outdoor heat exchangers, indoor heat exchangers, and refrigerant circuits may be shared to be an all-in-one type. You can also

  Moreover, in embodiment mentioned above, although the management server 120 and the air conditioning apparatus 110 were demonstrated as a different body, if the calculation capability of the air conditioning apparatus 110 permits, the function part of the management server 120 will be performed with the air conditioning apparatus 110 However, the embodiment can be realized only by the air conditioner 110.

  Further, in the above-described embodiment, an example has been described in which the future power transition is predicted on a daily basis through the predicted outside temperature in the future, such as the next day, and a daily operation map is generated. The period is not limited to days, but may be hours, minutes, or years. For example, when the driving map is updated on an hourly basis, if the predicted outside temperature changes in the future, it will be reflected, and a new driving map will be generated again before the target period starts. The driving map can also be updated. With this configuration, the EHP 112 and the GHP 114 can be efficiently operated in real time.

  Also provided are a program for causing the computer to function as the air conditioning apparatus 110 and the management server 120, and a computer-readable storage medium such as a flexible disk, a magneto-optical disk, a ROM, a CD, a DVD, and a BD on which the program is recorded. The Here, the program refers to data processing means described in an arbitrary language or description method.

  In addition, each process of the air conditioning method of this specification does not necessarily need to process in time series along the order described as a flowchart, and may include the process by parallel or a subroutine.

  INDUSTRIAL APPLICABILITY The present invention can be used for an air conditioning system and an air conditioning method for conditioning indoor air.

10 Facility 100 Air Conditioning System 110 Air Conditioning Device 112 EHP
114 GHP
120 Management Server 122 Management Communication Unit 140 Electric Motor 142 Electric Drive Compressor 144 EHP Outdoor Heat Exchanger 146 EHP Indoor Heat Exchanger 150 Gas Engine 152 Engine Driven Compressor 154 GHP Outdoor Heat Exchanger 156 GHP Indoor Heat Exchanger 170 Facility Power transition deriving unit 172 Air conditioning operation unit 180 Facility power transition estimating unit 182 Air conditioning power transition deriving unit 184 Operation map generating unit

Claims (4)

EHP having at least an electrically driven compressor that compresses refrigerant using an electric motor as a drive source;
GHP having at least an engine-driven compressor that compresses refrigerant using a gas engine as a drive source;
With
The price of electricity is determined at least according to the contracted power, the price of gas is determined at least according to the amount of gas used,
A facility power transition deriving unit for deriving a facility power transition that is a power transition excluding the EHP and the GHP in the facility;
A facility power transition estimating unit that estimates the facility power transition in the future from the past facility power transition and the predicted outside temperature in the future,
An air conditioning power transition deriving unit that subtracts the future facility power transition from the contract power and derives an air conditioning power transition that is a power transition usable in the EHP and the GHP;
Based on the air conditioning power transition, for each of a plurality of different air conditioning load factors , a plurality of combinations that apportion the operating load factors of the EHP and the GHP so as to satisfy the air conditioning load factor are generated. and the operating load factor of the EHP and the GHP combinations total price for electric power and the gas is minimized with respect to the air conditioning load factor, associating the the air conditioning load factor and the EHP and operating load factor of the GHP An operation map generator for generating an operation map;
In accordance with the operation map, an air conditioning operation unit that operates the EHP and the GHP at an operation load factor corresponding to a required air conditioning load factor;
An air conditioning system further comprising: EHP having at least an electrically driven compressor that compresses refrigerant using an electric motor as a drive source;
GHP having at least an engine-driven compressor that compresses refrigerant using a gas engine as a drive source;
With
The price of electricity is determined at least according to the contracted power, the price of gas is determined at least according to the amount of gas used,
A facility power transition deriving unit for deriving a facility power transition that is a power transition excluding the EHP and the GHP in the facility;
A facility power transition estimating unit that estimates the facility power transition in the future from the past facility power transition and the predicted outside temperature in the future,
An air conditioning power transition deriving unit that subtracts the future facility power transition from the contract power and derives an air conditioning power transition that is a power transition usable in the EHP and the GHP;
Based on each of the plurality of air conditioning power transitions provided in stages, for each of a plurality of different air conditioning load factors, the operating load factors of the EHP and the GHP are such that the sum of the charges of the power and the gas is minimized. And an operation map generation unit that generates an operation map in which the air conditioning load factor, the EHP, and the operation load factor of the GHP are associated with each other;
The plurality of operation maps are switched so that the power consumption actually measured in the facility is equal to or less than the contract power, and the EHP and the GHP are operated at an operation load factor corresponding to a required air conditioning load factor according to the operation map. An air-conditioning operation unit,
An air conditioning system further comprising: An air conditioning method in an air conditioning system comprising at least an EHP having an electrically driven compressor that compresses refrigerant using a motor as a driving source, and a GHP having an engine driven compressor that compresses refrigerant using at least a gas engine as a driving source The charge of power is determined at least according to the contracted power, the charge of gas is determined at least according to the amount of gas used,
Deriving a facility power transition that is a power transition excluding the EHP and the GHP in the facility,
Estimating the future facility power transition from the past facility power transition and the predicted outside temperature in the future,
Subtracting the future facility power transition from the contract power, and deriving an air conditioning power transition that is a power transition usable in the EHP and the GHP,
Based on the air conditioning power transition, for each of a plurality of different air conditioning load factors , a plurality of combinations that apportion the operating load factors of the EHP and the GHP so as to satisfy the air conditioning load factor are generated. and the operating load factor of the EHP and the GHP combinations total price for electric power and the gas is minimized with respect to the air conditioning load factor, associating the the air conditioning load factor and the EHP and operating load factor of the GHP Generate a driving map,
According to the operation map, the EHP and the GHP are operated at an operation load factor corresponding to a required air conditioning load factor. An air conditioning method in an air conditioning system comprising at least an EHP having an electrically driven compressor that compresses refrigerant using a motor as a driving source, and a GHP having an engine driven compressor that compresses refrigerant using at least a gas engine as a driving source The charge of power is determined at least according to the contracted power, the charge of gas is determined at least according to the amount of gas used,
Deriving a facility power transition that is a power transition excluding the EHP and the GHP in the facility,
Estimating the future facility power transition from the past facility power transition and the predicted outside temperature in the future,
Subtracting the future facility power transition from the contract power, and deriving an air conditioning power transition that is a power transition usable in the EHP and the GHP,
Based on each of the plurality of air conditioning power transitions provided in stages, for each of a plurality of different air conditioning load factors, the operating load factors of the EHP and the GHP are such that the sum of the charges of the power and the gas is minimized. And generating an operation map in which the air conditioning load factor, the EHP, and the operation load factor of the GHP are associated with each other,
The plurality of operation maps are switched so that the power consumption actually measured in the facility is equal to or less than the contract power, and the EHP and the GHP are operated at an operation load factor corresponding to a required air conditioning load factor according to the operation map. An air conditioning method characterized by:

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