JP5081514B2 - Calculation method of power saving effect in energy saving driving support method, energy saving driving support system, and calculation program of power saving effect - Google Patents

Description

  The present invention relates to an energy saving service providing method, a method for calculating a power saving effect in an energy saving operation support method suitable for use in an energy saving operation performed in a factory, an energy saving operation support system, and a power saving effect. It relates to a calculation program.

  At the Kyoto Conference on Global Warming Prevention in December 1997, Japan's global warming reduction target was set at 6% of the 1990 level. The “Law Concerning the Rational Use of Energy (Energy Conservation Law)” was revised and implemented in April 1999.

  Traditionally, large-scale factories were obliged to make efforts to save energy (hereinafter referred to as energy conservation), but this amendment expanded the scope of the law to medium-scale factories. On the other hand, for example, fans, blowers, and pumps are used in conventional load facilities in factories and the like, and various motors are used to drive them. In order to save power consumption (energy saving) of various driving motors, inverters are often introduced.

  While factories are promoting energy conservation on their own, companies that provide energy conservation are promoting the ESCO (Energy Service Company) business. The ESCO business promotes energy conservation renovation in buildings and factories. In the ESCO business, when an inverter was first introduced and power saving operation was attempted, the merits of the introduction were calculated and the inverter was purchased or the inverter was purchased depending on the lease or rental method. In such cases, the initial investment is difficult. In the lease or rental system, the lease or rental fee is high, or even if there is no energy saving effect, the contract period. If it was in the middle, payment had to be continued.

  On the other hand, a method has been proposed in which a user who desires energy saving can receive a desired energy saving service without making any initial investment (for example, Patent Document 1). If the person who provides energy saving improves or installs the user's equipment for energy saving and achieves energy saving, the benefits of energy saving between the service provider and the user in consideration of the degree of energy saving Are to be allocated. The degree of energy saving is power saving and the saved electricity charge.

  Establishing the International Performance Measurement & Verification Protocol (IPMVP) to evaluate the energy conservation amount objectively and scientifically as a result of the ESCO business, and proceed with the project smoothly, and evaluate the energy conservation amount We are striving to present methods and increase their reliability. In IPMVP, a method of measuring over a long period before introducing an inverter, a method of calculating by modeling at the time of introducing an inverter, and the like are presented. However, as a concrete modeling method for energy saving calculation, the current modeling method is not shown.

As an energy saving calculation method at the time of inverter introduction, the instantaneous power consumption at the time of inverter operation relative to the commercial operation is calculated from the instantaneous power consumption at the time of inverter operation calculated by the power consumption calculation means and the power retention data compared with the time of commercial operation. A power saving effect generating means for obtaining the power saving effect is disclosed (see Patent Document 2).
JP 2001-155089 A WO2005-002035

  In the energy saving calculation method shown in Patent Document 2, the instantaneous power consumption during inverter operation is calculated every moment, but compared with the power retention data during fixed commercial operation that is uniquely fixed. Therefore, there is a problem that it does not always show an accurate power saving effect.

  For example, when a fan / blower is driven by a motor, shaft power, that is, power consumption varies greatly depending on the state of the gas to be sucked in (temperature, pressure, humidity state). For this reason, if the measurement is performed by switching to damper control with commercial power immediately after measuring instantaneous power consumption during inverter operation that is measured every moment, the power consumption in the same gas state can be measured, and the difference Can be used as a power saving effect, but as a practical matter, switching operation is not possible. Moreover, although the method of measuring the state of the gas to inhale is also considered, the problem that a measurement sensor is added and a measurement item increases newly arises.

  The present invention has been made in view of the above problems, and a user who desires energy saving can receive a desired energy saving service without making any initial investment, and provides such an energy saving service. It is an object of the present invention to provide a method for calculating a power saving effect, an energy saving driving support system, and a program for calculating a power saving effect in an energy saving driving support method in which a person can expect a sufficient profit.

  In the present invention, the user wishes to save energy, and the person who provides the energy saving service improves or installs the user's equipment for energy saving. If the energy saving is achieved, the service is provided in consideration of the degree of energy saving. The benefit of energy saving is distributed between the user and the user. The degree of energy saving is power saving and the saved electricity charge.

  The calculation method of the power saving effect in the energy saving operation support method of the present invention is a calculation device (for example, calculation) that calculates an energy saving amount when an inverter device (for example, the inverter 5) that changes the operation frequency of the AC motor is operated. In the calculation method of the power saving effect in the energy saving driving support method using the device 26), the arithmetic device calculates the inverter input power of the inverter device by converting into the commercial frequency based on the power consumption and frequency during operation of the inverter device. The inverter input power is multiplied by the efficiency of the inverter device to calculate the motor input power to the AC motor, and the inverter is introduced by multiplying the motor input power by the shaft power reduction rate at the time of device control corresponding to the frequency. By calculating the previous reference power and subtracting the operating power consumption from the reference power, And wherein the Mel.

  According to the calculation method of the power saving effect in the energy saving driving support method of the present invention, a user who wishes to save energy can receive a desired energy saving service without making any initial investment, and such an energy saving service is also provided. The person who provides can expect enough profit.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.
First, the business form of the ESCO business according to the present invention will be described with reference to FIGS. 1 to 8, and the method for calculating the energy saving amount which is a characteristic technique of the present invention will be described with reference to FIGS. To explain.

  FIG. 1 is an explanatory diagram showing a business form of the ESCO business. FIG. 1 shows that contractor A has a target load facility, which will be described later, concludes a predetermined contract (contract including distribution of merit charges) with contractor B, and charges are exchanged via a finance company. Show. Contracts concluded by the contractor A (user), the contractor B (service provider), and the finance company are indicated by arrows 14. Target load equipment is equipment that has a fan or blower 1, pump 2, etc. used in factories as described above. These are not the main equipment for production and manufacturing, and they save energy despite the high power consumption. It is also a part where measures are relatively delayed. In these facilities, various motors 3 and 4 are currently used as drive sources. Therefore, users often have a desire to save energy without investing as much as possible in these facilities and equipment.

  The service provider measures the current power consumption of the facility of the user who wishes to save energy, or corrects the power consumption in consideration of various fluctuation factors, and obtains the current power consumption of the facility. This data and calculation results are shown to the user. Next, the service provider installs the inverter and a new motor as a set by the equipment inverter alone of the user who wishes to save energy. If the user wishes to upgrade the equipment, a new motor and inverter, fan, blower, etc. are installed as a set. Inverters 5 and 6 are connected to these motors 3 and 4 so that the rotational speed control of the motors 3 and 4 by the inverters 5 and 6 can be performed. Based on the current power consumption data of the existing motor of the contractor A collected by the monitoring unit 7, the characteristics before power saving are defined. This characteristic becomes a contract condition before power saving. The rotation speed is also referred to as the number of rotations, and is the speed at which the object rotates per unit time.

  The power consumption of new equipment and devices by controlling the rotational speeds of the motors 3 and 4 by the inverters 5 and 6 is monitored by the monitoring unit 7 installed by the contractor B, and inverter control operation data as power consumption is obtained. Based on this operation data and the current power consumption, a merit fee (power saving amount) is required.

  The delivery of equipment such as the inverters 5 and 6 and the monitoring unit 7 is made by the contractor B, but the cost required for delivery of equipment in this case is not charged to the user. Based on the above, distribution of merit fees is examined between the user and the service provider. At this time, consideration is given to the costs (often leased or rented) of the inverter, motor, fan, blower, pump, etc. installed in the user's equipment by the service provider. In other words, it is reasonable to cover this cost in the merit fee, not the burden on the user.

  In addition to delivering the equipment, the service provider provides operation management and after-sales service for the inverters 5 and 6. These are indicated by arrows 11.

  The user enters into a contract with the service provider to introduce a power saving motor drive system including a merit fee for power saving caused by controlling the rotational speed of the inverter.

  The inverter control operation data is taken into the remote monitoring system 20 of the contractor B as operation status data. This is indicated by arrow 13.

  The contractor B calculates a power saving amount by controlling the rotation speed of the inverter in the remote monitoring system 20, calculates and determines a power saving motor drive system usage fee at a predetermined rate, and performs a billing process. That is, the energy savings are shared by the contractors A and B according to a predetermined ratio (usage fee rate). However, in this contract, the energy saving amount of the limited target equipment (fans, blowers, pumps) varies depending on the operating status of the production line including the equipment, and cannot be guaranteed. For this reason, this agreement does not only share "about the amount of energy that exceeds a certain amount", but instead shares it according to the usage fee regardless of the amount of energy saved. In the present invention, the distribution of the merit fee to the service provider may be larger than that of the contractor A, and in some cases, the merit fee allocation to the contractor A may be zero.

  The obtained merit fee is notified to the contractor A from the contractor B. This is indicated by arrow 12. This billing process may be performed using a financial institution such as a finance company that is often used for payment of money as shown in the figure. In this case, as shown by an arrow 14, a contract for mediation is also concluded between the contractor A and the finance company. The merit notice is also sent from the contractor B to the finance company. This is indicated by arrow 15. The contractor B may sell the motor and inverter manufactured in-house to a finance company, lease it to the contractor B, and the contractor B may introduce the motor and inverter to the contractor A.

  Based on the merit notification, the contractor A pays the merit fee through the finance company to the contractor B. This is indicated by arrows 16 and 17. The fee collection business is not limited to a finance company, and a financial institution such as a bank, a post office, a convenience store, or the like may be used.

  In this embodiment, the obtained merit fee is calculated on the contractor B side and notified to the contractor A, but is not limited thereto. You may calculate by the operating condition data collection system 22 (refer FIG. 3) installed in the contractor A side.

  FIG. 2 is an explanatory diagram showing another business form of the ESCO business. FIG. 2 shows a case where the contractor A directly contracts with the contractor B. However, the contractor A is substantially the same as FIG.

  Service equipment such as a motor, an inverter, and a monitoring unit is installed in the contractor A's factory without initial investment, either owned by the contractor B or leased or rented by the contractor. Installation work costs, contractor A equipment remodeling costs, etc. may be determined separately.

  The contractor A operates the target load facility with the rotation speed control suitable for operation.

  FIG. 3 is a block diagram illustrating a method for collecting power consumption before power saving. A drive motor (IM) 32 is connected to the target load facility 31 on the system 30, and an ammeter is connected to a current transformer (CT) 33 and a transformer (VT) 34 provided on a line connected to the motor 32. The current and voltage are measured by the voltmeter. Further, a load such as a flow rate and pressure is detected from the target load facility 31. These measured signals and detected signals are transmitted to the monitoring unit 25 (monitoring system 24) of the operation status data collection system 22. The current operation data is calculated based on the collected and statistical data in this way, and the result is transmitted to the arithmetic unit (PC) 26.

  The above-described operation status data collection system 22 collects and statistics the operation status of the target load facility 31 as current operation data, and collects and statistics inverter actual operation data during rotation speed control operation by the inverter. The current operation data is operation data based on the current actual operation status of the target load facility 31 or the current assumed status.

  The operation status data collection system 22 includes a monitoring system 24 (including a monitoring unit 25) that collects inverter actual operation data, a computing device (PC) 26 that statistically analyzes the monitoring system 24, and an accumulated electric energy to the contractor B. A communication system 27 for communication.

  The calculated result is transmitted to the contractor B by e-mail via the communication system 27, for example, the modem 35 or the network 36 of the contractor A. The network 36 is a local area network (LAN) or a wide area network (WAN). This automatic transmission is sufficient once / day, but may be performed every moment. This information collection is performed using a remote monitoring system 20 of the contractor B as shown in FIG. 1 or FIG.

  The current operation data is transmitted to the data processing device 21 in the remote monitoring system 20 and stored in the storage device 23.

  FIG. 4 is a block diagram illustrating a method of collecting actual operation data (inverter actual operation data) when rotation control is performed with an inverter provided in the system. The same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.

  In the example shown in FIG. 4, inverters (INV) 5 and 6 are provided on the system 30, and a measurement current transformer 33 and a measurement transformer 34 are provided upstream of the inverters 5 and 6. A measurement current transformer 43 and a measurement transformer 44 are newly provided on the downstream side of the inverters 5 and 6.

  The current and voltage measured by the measurement current transformers 33 and 43 and the measurement transformers 34 and 44 are transmitted to the monitoring unit 25 of the monitoring system 24. Further, the load such as the flow rate and pressure of the target load facility 31 is also transmitted to the monitoring unit 25 in the same manner. In this case, the temperature and vibration of the target load facility 31 may also be detected and transmitted to the monitoring unit 25. This detected value is used for later maintenance.

  And power consumption is integrated | accumulated based on collection, statistics, or calculation of actual operation data. The accumulated result is transmitted to the contractor B by the communication system 27. This automatic transmission is sufficient once / day, but may be performed every moment.

  This information collection is performed using a remote monitoring system 20 of the contractor B as shown in FIG. 1 or FIG. The collected actual operation data is stored in the storage device 23 of the remote monitoring system 20.

  Based on the transmitted operation data, that is, the amount of power, the data processing device 21 possessed by the contractor B can immediately calculate the power saving amount and further the reduced merit fee. The same result can be obtained by installing the storage device 23 in the operation status data collection system 22 and transmitting the result to the data processing device 21. The calculation result is notified to the contractor A. In addition, the merit fee may be calculated by the operating status data collection system 22. In order to transfer the merit fee calculation result and the two operation data to the contractor B, it is desirable in terms of system configuration that the remote monitoring system 20 is used. As a result, operation management by the remote monitoring system 20 is performed.

  FIG. 5 is a power consumption characteristic diagram showing an example in which a blower is adopted for the target load equipment. In FIG. 5, when a blower is used for the target load facility 31, the characteristic (1) indicates the relationship between the power consumption (%) with respect to the air volume (%) in the current suction damper control without introducing the inverter. This characteristic (1) is defined as the collected current operation status data, and is adopted as the contract condition.

  Characteristic (2) shows the relationship of power consumption (%) to air volume (%) when the rotational speed control by the inverter is adopted instead of the suction damper control. This characteristic (2) is actual operation data during the rotational speed control operation by the inverter. Power saving is calculated by subtracting characteristic (2) from characteristic (1).

  Although the blower has been described in the above example, the power saving amount can be calculated in the same manner for other fans and pumps.

  FIG. 6 is a diagram showing the relationship between the air volume and power used as an example of the contract conditions before power saving. The operating status data collection system 22 measures parameters indicating the equipment operating status (eg, air volume, flow rate, etc.) and power consumption at that time. A contract condition curve before power saving shown in FIG. 6 is created from the measurement result, and is defined as the contract condition. FIG. 6 shows the relationship between the air volume (%) and the power (kW), which is an example of contract conditions before power saving.

  FIG. 7 is a diagram illustrating a calculation example of the power saving effect. The remote monitoring system 20 measures parameters (eg, air volume, flow rate, etc.) indicating the equipment operation status and power consumption at that time. Using the measurement result and the contract condition curve before power saving at the time of contract, the power saving effect is calculated as shown in FIG. The figure shows the integrated power amount KWh for each time. In the figure, the integrated power consumption before power saving calculated from the curve at the time of contract is statistically analyzed, and then the integrated power consumption during the power saving is calculated every moment. Find the power saving effect of minutes.

  The energy saving effect, that is, the merit fee from the power saving amount is obtained by multiplying the power saving amount by the power charge per unit, and the contract negotiated between the contractors A and B and, in some cases, the finance company The billing process is performed by reflecting the merit fee in the contents. From the viewpoint of the contractor A, this is a process for charging a fee.

  The contractor B is paid as a return merit for, for example, half of the power saving merit of the newly introduced facility operation. In other words, it becomes postpay merit fee after realizing the energy saving effect. The power saving merit is calculated by the contractor B from the actual operation data according to the contents decided in advance between the contractors, and notified to the contractor A every month. Regarding the operation data, the contractor B may confirm the data before the contractor B performs the billing process. In this way, the billing process based on the merit fee is performed. The maintenance may be performed by the contractor B free of charge, and the daily inspection may be performed by the contractor A.

  FIG. 8 is a flowchart showing the contract processing between the service provider and the contractor. As shown in the figure, the flow for billing processing is pre-investigated by marketing (step S1), the application data of the contractor A is obtained, and the service provision from the contractor A to the contractor B is made. (Step S2). Profitability is examined by the site survey of the contractor A (step S3). Current operating status data is collected and operating status data is collected (step S4). This data collection is performed, for example, for two months, whereby data analysis, final profitability consideration, and contract condition presentation are performed (step S5). The equipment use contract is concluded (step S6), and hardware installation is performed by hardware input of equipment such as a motor / inverter (step S7) (step S8). The installed hardware is operated, and other operation status data is collected by collecting actual operation data (step S9). Merit calculation, merit notification, and billing process are performed based on the obtained operating status data (step S10). Thereafter, after-sales service is performed (step S11).

According to this embodiment as described above, the merits of the contractor A (user) are as follows.
(1) Energy saving of electric power equipment having a motor can be achieved.
(2) Energy can be saved without initial investment.
(3) A contract can be made after confirming the power consumption effect, and there is no useless investment.
(4) Power-saving operation is possible, and equipment costs can be saved.

On the other hand, the merits of the contractor B (service provider) are as follows.
(1) Profits from merit fees can be secured.
(2) A new market for motors and inverters can be created.
(3) By adopting the remote system, it is possible to facilitate the operation management of the contractor A and reduce the management cost.

  According to the energy saving service providing method and apparatus of the present invention described above, the initial investment for the user is unnecessary and the required energy saving can be achieved, and the service provider distributes the merit fee generated by the energy saving. Can receive.

  In the present embodiment, it is shown in FIG. 5 that power saving is calculated by subtracting the characteristic (2) from the characteristic (1). However, the data processing device 21 of the remote monitoring system 20 stores it as a contract condition curve. Using the relationship between the air volume data or flow rate data stored in the device 23 and the power consumption data and the power consumption data, the inverter introduction with respect to the air volume or flow detected every moment during the rotation speed control after the inverter is installed. The previous power consumption is calculated. However, depending on the user, the air volume or flow rate may not be measurable. An energy saving monitoring system (operation status data collection system) and a method for calculating power saving when the air volume or flow rate is not measurable will be described.

  The energy saving monitoring system is characterized in that the virtual energy usage (baseline) at the time of operation before the introduction of the inverter can be estimated from the actually measured value of the energy usage by the introduction of the inverter.

FIG. 9 is a block diagram showing an energy saving monitoring system of the present invention. 9, the energy saving monitoring system 22A monitors the current and voltage from the measuring current transformer 33 and the measuring transformer 34 on the upstream side of the inverters 5 and 6 and the frequency of the inverters (INV) 5 and 6 every moment. doing. The energy saving monitoring system 22A shown in FIG. 9 is a simple system that does not have to monitor other measurement items (for example, temperature, flow rate, pressure) from time to time as compared with FIG. The same components described in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.
In the present embodiment, the energy-saving monitoring system 22A is described as a device separate from the inverters 5 and 6, but is not limited thereto. Since the inverters 5 and 6 have a microcomputer control function (including an arithmetic function) and a communication function, it is of course possible to incorporate the energy saving monitoring system 22A in the inverters 5 and 6.

  The computing device 26 of the energy saving monitoring system 22A can calculate the amount of energy saving from the measured value every moment. The calculation result every moment may be stored in a storage unit (not shown) and transmitted to the remote monitoring system 20 via the modem 35 or the network 36 after a predetermined time. Alternatively, the calculation result every moment may be transmitted to the remote monitoring system 20 as needed.

  Normally, after the inverter is installed, power measurement during damper control (before the inverter is introduced = baseline) cannot be performed. However, the energy saving monitoring system 22A uses the measurement data after the inverter is installed to measure the power before the inverter shown below. Can be calculated back to calculate energy savings.

  First, the input electric energy W1 (kWh) before inverter introduction is obtained by the following steps S21 to S25.

Step S21: Inverter input power P (INV) at 100% rotation speed is calculated.
P (INV) = W2 / T1 * (F0 / F1) ^ 3 (Formula 1)
Here, W2: Integrated electric energy (kWh) for a predetermined time (h)
F1: Average frequency (Hz) for a predetermined time (h)
T1: Operating time (h)
^: Exponentiation (eg, ^ 3 is the third power)
F0: Commercial frequency (predetermined frequency) (Hz)
W2 ÷ T1: power per unit time (kW), power P2 after inverter introduction

Step S22: Calculate motor input power P (IM) at 100% rotation speed.
P (IM) = P (INV) × η (Expression 2)
Where η: inverter efficiency (eg, 0.94)

Step S23: The shaft power reduction rate α (%) with respect to the frequency is calculated.
From the equipment specifications, plot the “change in reduction rate with respect to frequency (= rotation speed)” when controlling individual existing dampers, and derive the formula for shaft power reduction rate α with respect to frequency. Step S23 may be obtained in advance before step S21. The shaft power reduction rate α with respect to the frequency will be described with reference to FIG.

FIG. 10 is an explanatory diagram showing an example of the shaft power reduction rate with respect to the frequency. A line plotting “change in reduction rate with respect to frequency (= rotational speed)” when controlling individual existing dampers from the equipment specifications is simulated with an approximate expression and normalized to 100% shaft driving force when the frequency is 100%. ing. Here, the approximate expression is expressed as a cubic expression, but it may be a quadratic expression or the like, and it is preferable to adopt an expression having a high degree of approximation. The mathematical formula of α from FIG.
α = a × N ^ 3 + b × N ^ 2 + c × N + d (Formula 3)
Here, N: rotational speed (%) = F1 ÷ F0 × 100
a, b, c, d: constants

Step S24: Based on the shaft power reduction rate α, the inverter pre-introduction power P1 at the operating point is calculated.
P1 = P (IM) × α ÷ 100 (Expression 4)

Step S25: From the electric power P1 before introducing the inverter, the input electric energy W1 before introducing the inverter (baseline) is calculated.
W1 = P1 × T1 (Formula 5)

Thereby, the energy-saving power amount Ws (kWh) for a predetermined time can be calculated. The energy saving electric energy Ws is targeted only during inverter operation.
Ws = W1-W2 (Formula 6)
The merit amount Ys by energy saving with respect to the energy saving electric energy Ws is
Ys = Ws × Yu (Expression 7)
Where Yu: Unit price of electricity charge at the time of calculating the usage fee ($ / kWh)
The unit price of power charge is displayed in $ (dollar), but may be in local currency.

  For example, if the energy saving monitoring system 22A is monitoring at intervals of 10 minutes, in the formula (1), the predetermined time is, for example, 1/6 hours (10 Min). Also, if you want to know the amount of energy saved for one month, you should set it to one month.

(Calculation advantage)
FIG. 11 is an explanatory diagram showing the power saving effect of the present invention. FIG. 11 shows the relationship between the air volume / rotation speed (= frequency) and power consumption. For example, when a fan / blower is driven by a motor, shaft power, that is, power consumption varies greatly depending on the state of gas to be sucked in (temperature, pressure, humidity). For this reason, in this invention, since the virtual energy usage (baseline) at the time of the driving | operation before inverter introduction can be estimated from the measured value of energy usage (power consumption) by inverter introduction, the state of the gas to inhale Is added. It is possible to appropriately estimate the virtual energy usage in the operation before introducing the inverter in consideration of the gas state.

  Specifically, if the measured value changes from moment to moment to the measurement point Y at the measurement point X where the air volume is 60% in the characteristic (2) of the rotational speed control by the inverter, or if the actual power consumption decreases, step S21 ~ By calculating in step S25, the intersection Z (the power consumption by the suction damper control before the inverter introduction) between the dashed baseline of the suction damper control characteristic (1) and the drawing vertical line of 60% air volume is obtained. Will be. For this reason, correct power saving Pa and Pb can be calculated as a power saving effect. On the other hand, as a comparative example, when the suction damper characteristic (1) is uniquely fixed to the solid line, an excessive power saving Pc is obtained as compared with the correct power saving Pb. Even if the measured power consumption is reduced such that the measurement point X is the measurement point Y, it remains excessive because it remains in the solid line of the characteristic (1). According to the present embodiment, it is possible to easily calculate a calculation result in consideration of the state of the gas to be sucked.

  In general, the air volume of a blower is controlled by a damper control (suction damper control, discharge) that adjusts the air volume by mechanically changing the duct resistance and the inflow angle to the impeller while keeping the fan / blower rotational speed constant. Damper control) and vane control are implemented. FIG. 11 illustrates an example of suction damper control and rotational speed control by an inverter. Similarly, the energy saving monitoring system 22A can simplify the power saving or the power saving by the discharge damper control and the rotation speed control by the inverter, or the power saving or the power saving by the vane control and the rotation speed control by the inverter. Can be calculated.

  The calculation method of the power saving effect in the energy saving operation support method of the present invention is the method of saving energy in the energy saving operation support method using the arithmetic unit 26 that calculates the energy saving amount when the inverter 5 that changes the operation frequency of the AC motor is operated. In the method for calculating the power effect, the arithmetic unit 26 calculates the inverter input power of the inverter 5 by converting into the commercial frequency based on the power consumption and frequency during operation of the inverter 5, and converts the inverter input power into the efficiency of the inverter 5. Is used to calculate the motor input power to the AC motor, and the motor input power is multiplied by the shaft power reduction rate at the time of device control corresponding to the frequency to calculate the reference power before the inverter is introduced. Power consumption can be calculated by subtracting power consumption during operation, so device control (for example, suction Damper control, discharge damper control, the vane control) the power saving or power savings due to the rotational speed control by an inverter, can be easily computed.

It is explanatory drawing which shows the business form of an ESCO business. It is explanatory drawing which shows the other business form of an ESCO business. It is a block diagram which shows the method for collecting the power consumption before power saving. It is a block diagram which shows the method of collecting actual operation data at the time of providing an inverter in a system | strain and performing rotation control. It is a power consumption characteristic figure which shows the example at the time of employ | adopting a blower for the load equipment of object. It is a figure which shows the relationship between the air volume used as an example of contract conditions before power saving, and electric power. It is a figure which shows the example of calculation of a power-saving power effect. The flowchart which shows the contract process of a service provider and a contractor is shown. It is a block diagram which shows the energy saving monitoring system of this invention. It is a characteristic view which shows the shaft power reduction rate with respect to a frequency. It is explanatory drawing which shows the power-saving effect of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fan, blower 2 Pump 3, 4 Motor 5, 6 Inverter 7 Monitoring unit 11, 12, 13, 14, 15, 16, 17 Arrow 20 Remote monitoring system 21 Data processing device 22 Operating condition data collection system 22A Energy saving monitoring system 23 Storage device 24 Monitoring system 25 Monitoring unit 26 Arithmetic unit 27 Communication system 31 Target load facility 33 Current transformer 34 Transformer 35 Modem 36 Network

Claims (10)

In the calculation method of the power saving effect in the energy saving operation support method using the calculation device that calculates the energy saving amount when operating the inverter device that changes the operating frequency of the AC motor,
The arithmetic unit is:
Based on the operating power consumption and frequency of the inverter device, the inverter input power of the inverter device is calculated by converting to a commercial frequency,
Calculate the motor input power to the AC motor based on the inverter input power and a coefficient related to the efficiency of the inverter device,
Based on the motor input power and a coefficient related to the shaft power reduction rate at the time of device control corresponding to the frequency, the reference power before the inverter introduction is calculated,
A power saving effect calculation method, comprising: calculating power saving power based on the reference power and the driving power consumption. Before Symbol motor input power to the inverter input power, is calculated by multiplying the coefficients according to the efficiency of the inverter device,
The reference power is calculated by multiplying the motor input power by a coefficient related to a shaft power reduction rate at the time of device control corresponding to the frequency,
The calculation method of the power saving effect according to claim 1, wherein the power saving is calculated by subtracting the driving power consumption from the reference power. The said apparatus control is damper control or vane control. The calculation method of the power-saving effect of Claim 1 or Claim 2 characterized by the above-mentioned. The said AC motor is connected to the fan or the blower. The calculation method of the power-saving effect of Claim 1 or Claim 2 characterized by the above-mentioned. The calculation method of the power saving effect according to claim 1 or 2, wherein the operating power consumption is obtained by dividing an integrated power amount for a predetermined period by an operating time of the inverter. The shaft power reduction rate at the time of the device control is obtained by an approximate expression of a change in the reduction rate with respect to the frequency at the time of individual existing device control from the device specification. Calculation method of power consumption effect. In an energy saving operation support system comprising an arithmetic device that calculates an energy saving amount when operating an inverter device that changes the operating frequency of an AC motor,
The arithmetic unit is:
Based on the operating power consumption and frequency of the inverter device, means for calculating the inverter input power of the inverter device in terms of commercial frequency,
Means for calculating motor input power to the AC motor based on the inverter input power and a coefficient relating to the efficiency of the inverter device;
Means for calculating a reference power before the introduction of the inverter based on the motor input power and a coefficient relating to a shaft power reduction rate at the time of device control corresponding to the frequency;
Means for calculating power saving based on the reference power and the driving power consumption. An energy saving driving support system, comprising: Means for calculating the pre-Symbol motor input power to the inverter input power, is calculated by multiplying the coefficients according to the efficiency of the inverter device,
The means for calculating the reference power is calculated by multiplying the motor input power by a coefficient related to a shaft power reduction rate at the time of device control corresponding to the frequency,
The energy saving driving support system according to claim 7, wherein the means for calculating the power saving power is calculated by subtracting the driving power consumption from the reference power. In the calculation program of the power saving effect in the energy saving operation support method using the arithmetic device that calculates the energy saving amount when operating the inverter device that changes the operating frequency of the AC motor,
In the arithmetic unit,
Based on the operating power consumption and frequency of the inverter device, a process of calculating the inverter input power of the inverter device in terms of commercial frequency,
A process of calculating the motor input power to the AC motor based on the inverter input power and a coefficient relating to the efficiency of the inverter device;
A process of calculating a reference power before the introduction of the inverter based on the motor input power and a coefficient related to a shaft power reduction rate at the time of device control corresponding to the frequency;
A process of calculating power saving based on the reference power and the driving power consumption;
A program for calculating the power-saving effect, characterized in that Processing for calculating the pre-Symbol motor input power to the inverter input power, is calculated by multiplying the coefficients according to the efficiency of the inverter device,
The process of calculating the reference power is calculated by multiplying the motor input power by a coefficient related to a shaft power reduction rate at the time of device control corresponding to the frequency,
The calculation program of the power saving effect according to claim 9, wherein the process of calculating the power saving power is calculated by subtracting the operating power consumption from the reference power.

Images