JP2005106444A - Energy saving effect quantity calculation method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate influence of outdoor air condition and improve reliability of calculated energy saving effect quantity. <P>SOLUTION: For example, in the case that August is specified, an average year stop ratio β' of an air conditioner group is calculated from a difference Δt between an actual outdoor air temperature tav of August and a reference average year temperature tst, an actual stop ratio β calculated from operation state of the air conditioner group and a stop ratio variation quantity α per unit temperature of the air conditioner group using the following equation; β'=β+α×Δt. From the calculated average year stop ratio β', the number N of operation days of the air conditioner group in August, operation schedule hours H in a day and overall rated electric power ΣPc of the air conditioner group, an average year conversion value of electric power quantity reduced by an energy saving control in August is calculated by the following equation; Ps'=β'×N×H×ΣPc. The calculated average year conversion value of electric power quantity is converted into reduced price of a base charge and a metered rate and displayed as a chart. Though the outdoor air temperature is used as the outdoor air condition in this example, outdoor air enthalpy may be used as the outdoor air condition. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an energy saving effect amount calculating method and apparatus for calculating an energy saving effect amount of a device group in which energy consumption such as an air conditioner has a correlation with outside air conditions (outside air enthalpy, outside air temperature, etc.).

  In recent years, environmental issues have been highlighted as social issues, and efforts are being made to reduce environmental impact from various aspects, such as the revision of the Energy Conservation Law and the Recycling Law. Recently, business building (office building) operators have been required to disclose information on efforts to reduce environmental impact.

  For this reason, in the past, power saving control was performed to reduce energy consumption by equipment, and various types of data in the building were automatically collected in a computer (hereinafter referred to as a management computer) provided in a central monitoring room. An energy saving effect amount (hereinafter abbreviated as an energy saving effect amount) is calculated (see Patent Document 1).

  For example, as shown in FIG. 7, the management computer 1 periodically collects the operating states (operation / stop) of the air conditioners 2-1 to 2-n as the target device group, and the air conditioners 2-1 to 2-2. The actual stop rate β for one month is obtained from the operating state of −n, and the air conditioner operating days N, the daily operation schedule time H, and the air conditioners 2-1 to 1 for the actual stop rate β The total rated power ΣPc of 2-n is multiplied, and Ps (Ps = β × N × H × ΣPc) obtained thereby is obtained as the amount of power reduced by the power saving control.

JP 2002-228225 A

  Since the actual stop rate β depends on the outside air temperature, the energy saving effect amount calculated as described above is also affected by the outside air temperature. As a result, for example, when the outside air temperature is higher than the normal temperature, the energy saving effect amount decreases. Conversely, when the outside air temperature is lower than the normal temperature, the energy saving effect amount increases. In the conventional calculation method of energy saving effect amount, the energy saving effect amount is calculated in a form that includes the increase / decrease due to the influence of the outside air temperature. Therefore, it cannot be said that the pure energy saving effect amount by power saving control is calculated. The amount of energy saving effect was lacking in reliability.

  The present invention has been made in order to solve such a problem, and the object of the present invention is to eliminate the influence of the outside air condition and increase the reliability of the calculated energy saving effect amount. It is to provide a calculation method and apparatus.

In order to achieve such an object, the present invention periodically collects the operating state and the outside air condition of a device group whose energy consumption is correlated with the outside air condition as data, and within a predetermined period of the collected outside air condition. The average value of the energy saving effect amount of the equipment group within the predetermined period is determined based on at least the difference between the actual outside air condition and the standard normal condition within the predetermined period and the operating state of the equipment group within the predetermined period. The average value is calculated.
According to this invention, when the predetermined period is, for example, one month, the device group for the month is based on the difference between the actual outside air condition for the month and the standard normal outside air condition and the operating state of the device group. The average value of energy saving effect is calculated.

  In the present invention, the normal value of the energy saving effect amount of the device group is calculated based on at least the difference between the actual outdoor air condition and the standard normal outdoor air condition and the operation state of the device group. More specifically, the actual outdoor air condition and the predetermined value are calculated. Difference from standard normal outside air conditions within the period (Δt), actual stoppage rate (β) obtained from the operating state of the device group within a predetermined period, and the actual stoppage rate for each day during the period when data is collected Based on the amount of change in stop rate per unit outside air condition (α) obtained by correlation with the outside air condition, the normal stop rate (β ′) of the device group within a predetermined period is calculated, and this calculated normal stop Based on the rate, the normal value of the energy saving effect amount of the device group within the predetermined period is calculated.

  Further, in the present invention, for a future period in which data is not collected, the average value of the actual stop rate of the device group in the already collected period, the average value of the already collected outside air condition, and the standard of the future period The energy saving effect amount of the device group is predicted based on the difference from the normal outside air condition and the amount of change in the stop rate per unit outside air condition of the device group. More specifically, the difference (Δtp) between the average value of the already collected outside air conditions and the standard normal year outside air condition of the future period, the average value of the actual stop rate of the device group already collected and the future period Based on the estimated stoppage rate (βp) calculated based on the difference from the standard normal outside air condition of the unit, and the change rate (α) per unit outside air condition of the device group in the future period when data is not collected Predict the amount of energy saving effect of the device group.

According to the present invention, when the predetermined period is, for example, one month, based on the difference between the actual outside air condition for one month and the standard normal outside air condition and the operation state of the device group, The average value of the energy saving effect amount is calculated, the influence of the outside air condition is eliminated, and the reliability of the actual value of the obtained energy saving effect amount can be improved.
In addition, based on the difference between the average value of the outside air conditions already collected and the standard normal year outside air conditions, and the predicted operating state of the device group, the energy saving effect amount of the device group will also be calculated for future periods when data is not collected. By predicting the above, it is possible to eliminate the influence of the outside air condition and make it easy to visually understand the obtained energy saving effect amount.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of an energy saving effect amount calculation apparatus used for implementing the present invention. In the figure, reference numeral 100 denotes an energy saving effect amount calculation device according to the present invention, which is realized by hardware including a processor and a storage device, and a program for realizing various functions in cooperation with these hardware. Specifically, a program is installed in a personal computer (personal computer), and is realized as a CPU processing operation according to the installed program.

  The energy saving effect amount calculation device 100 includes a calculation unit 3, a database 4, a display unit 5, a standard normal temperature storage table TB1, and an air conditioner operating day storage table TB2. The calculation unit 3 includes an energy saving effect amount actual value calculation unit 3-1, a normal conversion energy saving effect amount calculation unit 3-2, and an energy saving effect amount predicted value calculation unit 3-3. The processes in the energy saving effect amount actual value calculation unit 3-1, the normal conversion energy saving effect amount calculation unit 3-2, and the energy saving effect amount predicted value calculation unit 3-3 will be described later.

  The standard normal temperature storage table TB1 stores the normal temperature (standard normal temperature) of each region in each month for one year announced by the Japan Meteorological Agency. That is, the standard normal temperature in January is tst1, the standard normal temperature in February is tst2, and the standard normal temperature tst until December is stored in the same manner. The air conditioner operating days storage table TB2 stores the air conditioner operating days of each month for one year in the building where the air conditioners 2-1 to 2-n are provided. That is, the air conditioner operating days in January is N1, the air conditioner operating days in February is N2, and the air conditioner operating days N until December are stored in the same manner.

  The calculation unit 3 has a function of periodically collecting the operation states (operation / stop) of the air conditioners 2-1 to 2-n and the outside air temperature tpv and storing them in the database 4 as performance data. In addition, the calculation unit 3 performs the processing in the energy saving effect amount actual value calculation unit 3-1, the normal conversion energy saving effect amount calculation unit 3-2, and the energy saving effect amount predicted value calculation unit 3-3 in the standard normal temperature storage table TB1. Standard normal temperature tst, air conditioner operation days storage table TB2, air conditioner operation days N, and daily operation schedule set in advance so that air conditioners 2-1 to 2-n continue to operate according to the normal time schedule The time H, the total rated power ΣPc of the air conditioners 2-1 to 2-n, the outside air temperature tpv stored in the database 4, and the operating state of the air conditioners 2-1 to 2-n are captured.

  In the present embodiment, the air conditioners 2-1 to 2-n are controlled to be operated / stopped based on the room temperature, that is, the power saving control is performed, and the operation state (operation) is also performed within the operation schedule time H. / Stop) changes.

[Operation]
FIG. 2 shows a flowchart of processing operations unique to the present embodiment performed by the calculation unit 3. Hereinafter, referring to this flowchart, the processing operation in the energy saving effect amount actual value calculation unit 3-1, the normal conversion energy saving effect amount calculation unit 3-2, and the energy saving effect amount predicted value calculation unit 3-3 in the calculation unit 3 will be described. explain.

  The calculation unit 3 periodically collects the operation states (operation / stop) of the air conditioners 2-1 to 2-n that have been subjected to power saving control and the outside air temperature tpv, and stores them in the database 4 as performance data (step 201). Based on the actual data stored in the database 4, the energy saving effect amount actual value calculation unit 3-1 calculates the actual value Ps of the energy saving effect amount every month (step 202) and stores it in the database 4 (step 202). 203).

[Processing in the energy saving effect amount actual value calculation section]
FIG. 3 shows a process of calculating the actual value Ps of the energy saving effect amount in the energy saving effect amount actual value calculation unit 3-1. The energy saving effect amount actual value calculation unit 3-1 takes out the operation state of the air conditioners 2-1 to 2-n for the past month from the database 4, and stores the past from the operation state of the air conditioners 2-1 to 2-n. The actual stoppage rate β for one month is obtained. Further, the air conditioner operating days N for one month are extracted from the air conditioner operating days storage table TB2. Then, the preset daily operation schedule time H and the total rated power ΣPc of the air conditioners 2-1 to 2-n are taken in, and Ps = β × N × H × ΣPc is used for power saving control for one month. Find the reduced amount of power (actual value of energy saving effect amount).

  When an operation button (not shown) is pressed after designating the period (YES in step 204), the calculation unit 3 determines from the performance data stored in the database 4 that the air conditioner is changed by 1 ° C. The amount of change in the stop rate 2-1 to 2-n (the amount of change in the air conditioner group stop rate) is obtained as a coefficient α (% / ° C.) (step 205). There are two types of coefficient α, cooling and heating, and it is determined whether to use the coefficient α during cooling or the coefficient α during heating according to each month of the specified period in the following processing. .

[Processing by the normal-equivalent energy-saving effect amount calculation unit]
FIG. 4 shows a process of calculating a normal-year converted value Ps ′ of the energy saving effect amount in the normal-year converted energy saving effect amount calculation unit 3-2. The average annual energy saving effect amount calculation unit 3-2 checks whether or not the actual data is stored in the database 4 for each month of the period specified in step 204 (step 206), and the actual data is stored. The average energy conversion value Ps ′ of the energy saving effect amount is obtained only for a certain month.

  For example, it is assumed that the designated period is from August 2003 to July 2004, and performance data is stored in the database 4 for August and September of 2003.

  In this case, the normal-equivalent energy saving effect amount calculation unit 3-2 first takes out the operation state of the air conditioners 2-1 to 2-n for the month of August 2003 from the database 4, and extracts the air conditioner thus taken out. The actual stop rate β for one month is obtained from the operating states of the machines 2-1 to 2-n (step 207).

  In addition, the average energy saving effect amount calculation unit 3-2 takes out the outside temperature tpv for the month for August 2003 from the database 4, and averages the outside temperature for the month from the taken outside temperature tpv. The value is obtained as the actual outside air temperature tav (tav8) (step 208). Then, the standard normal temperature tst (tst8) of August is taken out from the standard normal temperature storage table TB1, and a difference Δt between the actual outside temperature tav (tav8) and the standard normal temperature tst (tst8) is obtained (step 209).

  Then, β ′ = β + α × Δt is obtained from the obtained actual stop rate β, the difference Δt between the actual outside air temperature tav and the standard normal temperature tst and the coefficient (air conditioner group stop rate change amount) α obtained in step 205 as β ′ = β + α × Δt. The normal stoppage rate β ′ for August of the year is calculated (step 210).

  Further, the air conditioner operating days N (N8) of August 2003 is taken out from the air conditioner operating days storage table TB2, and the total daily operating schedule time H and air conditioners 2-1 to 2-n are set. From the rated power ΣPc, an average value of the amount of power reduced by the power saving control in August 2003 (average value of energy saving effect amount) is obtained as Ps ′ = β ′ × N × H × ΣPc (step 211). .

  Then, the calculated normal amount of the reduced electric energy is converted into a reduction amount of the pay-as-you-go charge (step 212), and the result is displayed on the display unit 5 as a result value (normal value) (step 213). . Similarly, for September 2003, the average value of the amount of power reduced by the power saving control is obtained, converted to a reduction amount of the pay-to-use fee, and the result is displayed on the display unit 5 as an actual value (normal value) Display a graph. A display example is shown in FIG. In this graph, since the influence of the outside air temperature is eliminated from the reduction amount of the metered charge for each month (August, September) displayed, the reliability is high.

[Processing in the energy conservation effect amount predicted value calculation unit]
FIG. 6 shows a process of calculating the predicted value Psp ′ of the energy saving effect amount in the energy saving effect amount predicted value calculation unit 3-3. The energy saving effect amount predicted value calculation unit 3-3 checks whether or not the actual data is stored in the database 4 for each month of the period specified in step 204 (step 206), and the actual data is stored. For a month without the energy saving effect amount, a predicted value Psp ′ is obtained.

  For example, it is assumed that the specified period is from August 2003 to July 2004, and no actual data is stored in the database 4 for October 2003 to July 2004. In other words, the period from October 2003 to July 2004 is a future period.

  In this case, the energy saving effect amount predicted value calculation unit 3-3 first obtains the actual stop rate from all the collected operating states of the air conditioners 2-1 to 2-n stored in the database 4, The predicted stop rate βp of the air conditioners 2-1 to 2-n is obtained based on the difference between the average value of the actual stop rates and the standard normal outside air temperature in the future period from October 2003 to July 2004 ( Step 215).

  Further, the energy saving effect amount predicted value calculation unit 3-3 obtains the same period actual average outside temperature (outside temperature total average) tav stored in the database 4 (step 216). Then, the standard normal temperature tst (tst10) in October is taken out from the standard normal temperature storage table TB1, and a difference Δtp between the total average tav of the outside air temperature and the standard normal temperature tst (tst10) is obtained (step 217).

  Then, βp ′ = βp + α × Δtp is obtained from the calculated predicted stop rate βp, the difference Δtp between the outside temperature total average tav and the standard normal temperature tst, and the coefficient (air conditioner group stop rate change amount) α obtained in step 205. The normal-year predicted stoppage rate βp ′ for October 2003 is calculated (step 218).

  Further, the air conditioner operating days N (N10) in October 2003 is taken out from the air conditioner operating days storage table TB2, and the total daily operating schedule time H and the air conditioners 2-1 to 2-n are set. From the rated power ΣPc, the amount of power (predicted value of the energy saving effect amount) that will be reduced by the power saving control in October 2003 is determined as Psp ′ = βp ′ × N × H × ΣPc (step 219).

  Then, the calculated amount of power that will be reduced is converted into a reduced amount of the pay-as-you-go charge (step 212), and the result is displayed on the display unit 5 as a trial calculation value (predicted value) (step 213). Similarly, from November 2003 to July 2004, the amount of power that would be reduced by power saving control is obtained, converted to a reduced amount of metered charges, and the result is displayed as a trial calculation value (predicted value). A graph is displayed in part 5. FIG. 5B shows a display example. In this graph, since the influence of the outside air temperature is eliminated from the reduction amount of the metered charge for each month (October to July) displayed, the reliability is high.

  Further, in the present embodiment, the energy saving effect amount predicted value calculation unit 3-3 predicts the energy saving effect amount in the future even if the database 4 has only short-term performance data. That is, even if there is only short-term actual data in the database 4, the predicted stoppage rate βp and the total outside air temperature average tav can be obtained, so that it is possible to save energy in the future without having to wait until the long-term actual data is accumulated in the database 4. A predicted value of quantity can be obtained. It is also possible to compare the actual value with the predicted value at a certain point in time in the past on the display, and check how much the predicted value deviates from the actual value. Is also possible.

In the above-described embodiment, the air conditioner group is described as an example of the device group having a correlation with the outside air temperature. However, it goes without saying that the device group having a correlation with the outside air temperature is not limited to the air conditioner group. .
In the above-described embodiment, the outside air condition is described as the outside temperature. However, the outside air enthalpy may be set as the outside air condition.

It is a block diagram which shows an example of the energy-saving effect amount calculation apparatus used for implementation of this invention. It is a flowchart which shows the specific process operation | movement performed by the calculating part in this energy saving effect amount calculation apparatus. It is a figure explaining the calculation process of the actual value Ps of the energy saving effect amount in the energy saving effect amount actual value calculation part. It is a figure explaining the calculation process of the normal value conversion value Ps' of the energy saving effect amount in a normal year conversion energy saving effect amount calculation part. The figure which shows the example of a display of the reduction amount (normal value converted) of the metered price of the electric energy reduced by power saving control, and the example of a display of the reduction amount (predicted value) of the metered price of the electric energy which will be reduced by power saving control It is. It is a figure explaining the calculation process of the predicted value Psp 'of the energy saving effect amount in the energy saving effect amount predicted value calculation unit. It is a figure explaining the calculation method of the conventional energy saving effect amount.

Explanation of symbols

2-1 to 2-n ... air conditioner (air conditioner group), 3 ... calculating unit, 3-1, ... energy saving effect amount actual value calculating unit, 3-2 ... normal conversion energy saving effect amount calculating unit, 3-3 ... energy saving Expected effect amount calculation unit, 4... Database, 5... Display unit, TB1... Normal normal temperature storage table, TB2.

Claims (8)

A process of periodically collecting data on the operating state and the outside air condition of the device group whose energy consumption correlates with the outside air condition;
The average value of the collected outside air conditions within a predetermined period is set as the actual outside air condition, and at least the difference between the actual outside air condition and the standard normal outside air condition within the predetermined period and the operation state of the device group within the predetermined period. And calculating a normal value of an energy saving effect amount of the device group within the predetermined period based on the energy saving effect amount calculation method. In the energy-saving effect amount calculation method described in Claim 1,
Energy saving effect of the device group based on the difference between the average value of the outside air condition already collected and the standard normal outside air condition and the predicted operating state of the device group for a future period in which the data is not collected An energy saving effect amount calculation method comprising: a step of predicting the amount. A process of periodically collecting data on the operating state and the outside air condition of the device group whose energy consumption correlates with the outside air condition;
The average value of the collected outside air conditions within a predetermined period is set as the actual outside air condition, and the difference between the actual outside air condition and the standard normal outside air condition within the predetermined period is obtained from the operating state of the device group within the predetermined period. A step of calculating an average outage rate of the device group within the predetermined period based on the actual stop rate and the amount of change in the stop rate per unit outside air condition of the device group;
A method for calculating an energy saving effect amount, comprising: calculating a normal value of an energy saving effect amount of the device group within the predetermined period based on the calculated normal stoppage rate. In the energy saving effect amount calculation method according to claim 3,
For future periods in which the data has not been collected, the average value of the actual stop rate of the device group during the period in which the data has already been collected, the average value of the outside air conditions that have already been collected, and the standard normal outside air conditions in the future period An energy saving effect amount calculation method comprising: predicting the energy saving effect amount of the device group based on the difference and the change rate of the stop rate per unit outside air condition of the device group. Data collection means for periodically collecting the operating state of the equipment group whose energy consumption is correlated with the outside air condition and the outside air condition as data;
An average value of the outside air conditions collected by the data collecting means within a predetermined period is set as an actual outside air condition, and at least a difference between the actual outside air condition and a standard normal outside air condition within the predetermined period and the device within the predetermined period. An energy saving effect amount calculating device comprising: an energy saving effect amount calculating means for calculating an average value of the energy saving effect amount of the device group within the predetermined period based on an operation state of the group. In the energy-saving effect amount calculation apparatus described in Claim 5,
Energy saving effect of the device group based on the difference between the average value of the outside air condition already collected and the standard normal outside air condition and the predicted operating state of the device group for a future period in which the data is not collected An energy saving effect amount calculation device comprising: an energy saving effect amount prediction means for predicting an amount. Data collection means for periodically collecting the operating state of the equipment group whose energy consumption is correlated with the outside air condition and the outside air condition as data;
The average value of the outside air condition collected by the data collecting means within a predetermined period is set as the actual outside air condition, the difference between the actual outside air condition and the standard normal outside air condition within the predetermined period, the device group within the predetermined period. A normal stop rate calculating means for calculating a normal stop rate of the device group within the predetermined period, based on the actual stop rate obtained from the operating state and the amount of change in the stop rate per unit outside air condition of the device group;
An energy saving effect amount calculating means for calculating an average value of the energy saving effect amount of the device group within the predetermined period based on the normal stop rate calculated by the normal stop rate calculating means. Quantity calculation device. In the energy-saving effect amount calculation apparatus described in Claim 7,
For future periods in which the data has not been collected, the average value of the actual stop rate of the device group during the period in which the data has already been collected, the average value of the outside air conditions that have already been collected, and the standard normal outside air conditions in the future period An energy saving effect amount calculating device comprising: an energy saving effect amount predicting means for predicting an energy saving effect amount of the device group based on the difference and a stop rate change amount per unit outside air condition of the device group.

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