JP4147204B2 - Evaluation support method for power consumption reduction, evaluation support device, and power control device - Google Patents

Description

  The present invention relates to a power reduction evaluation support method, apparatus, and power control apparatus in the case of power saving by extending the stop time, for example, in temperature control of a cooling target by repeatedly operating and stopping an air conditioner or the like.

  Conventionally, by operating and stopping compressors such as air conditioners repeatedly in air conditioning, cooling, refrigeration, etc. in houses, offices, workplaces, warehouses, and display shelves using air conditioners, refrigerators, or heat insulators. The temperature is adjusted.

  By the way, from the standpoint of protecting the global environment, ISO 14000, which is an international standard for the environment, has been established and many improvements have been made for energy saving. The reduction of power consumption is also greatly related to the reduction of carbon dioxide, and from the viewpoint of preventing global warming, reduction of power consumption is required for various electric appliances. The present applicant has also previously proposed a power control device for saving power consumption (Patent Document 1).

According to Patent Document 1, for example, it is detected that the temperature rises to the upper limit set temperature and the motor that operates the compressor is switched from OFF to ON, and when detected, the motor is forcibly returned to OFF, Switch on the motor after the time has elapsed.
JP 2003-130418 A

  The reduction in power consumption in Patent Document 1 is to maintain a stopped state of an air conditioner even after reaching an upper limit set temperature and operate the air conditioner to cool it after a predetermined time has elapsed. As a result, the time required to lower the room temperature from the temperature when the air conditioner is stopped to the upper limit set temperature is shorter than the predetermined time during which the air conditioner was stopped. Power is reduced. Such a power control device is sold or rented for the purpose of power saving in, for example, ordinary households and business establishments. Therefore, the power control device is required to allow the user to feel the power saving effect. In particular, when carrying out a business that rents power control devices, it is conceivable to link the rental fee with the amount of power consumption reduction (hereinafter also referred to as “power saving amount”). It is necessary to accurately calculate the power consumption after installation.

  However, until now, it has not been easy to compare the power consumption before and after the introduction of the power control device, and when the power supply of the air conditioner is common to other devices (for example, lighting devices and power devices). Therefore, it was even more difficult to evaluate the power saving effect.

  The present invention has been made in view of the above-described problems. For example, it is an object of the present invention to provide an evaluation support method and a power control apparatus that accurately evaluate a power saving amount of an air conditioner or the like.

An evaluation support method for power consumption reduction according to the present invention provides an air conditioner or the like that should be operated in a normal mode in which ON / OFF is repeated between a first set temperature and a second set temperature. In the case of controlling to be operated in the power saving mode so as to maintain the off state for a predetermined time even when the value becomes, it is an evaluation support method of power consumption reduction amount when the air conditioner or the like is operated continuously The limit temperature reachable by the temperature control target and the time constant of the temperature change of the temperature control target during operation of the air conditioner or the like are stored in a memory, and the air conditioner or the like becomes the first set temperature. A first time from when the air conditioner is turned off to the second set temperature is measured and stored in a memory, and after the predetermined time has elapsed, the air conditioner or the like is turned on and then the first set temperature is reached. Measure the second time to become in memory And acquiring the ambient temperature of the air-conditioning target and storing it in a memory. Based on the ambient temperature, the limit temperature, the time constant, the first set temperature, and the second set temperature, When it is assumed that the air conditioner or the like is turned on when the set temperature reaches 2, the virtual time from the previous second set temperature to the first set temperature is calculated, and the first time, Based on the predetermined time, the second time, and the virtual time , the power saving time, which is a reduction amount of the on time of the air conditioner when compared with the normal mode in the power saving mode, or the air conditioner the power-saving amount which is the amount of reduction power consumption by reducing the on-time, determines and outputs a power savings as evaluable data.

In another power consumption reduction evaluation support method according to the present invention, the first time from when the air conditioner or the like is turned off to the second set temperature when the first set temperature is reached is measured. To store in the memory, measure the second time from when the air conditioner or the like is turned on after the predetermined time elapses until the first set temperature is reached, and store it in the memory. When it is detected that the second set temperature has been reached at least once during the on / off cycle, the air conditioner is turned on immediately, and the air conditioner is turned on to reach the first set temperature. A third time to be measured and stored in the memory, and based on the first time, the predetermined time, the second time, and the third time, in the power saving mode, the normal mode and Reduction of on-time of the air conditioner, etc. when compared The power-saving amount which is the amount of reduction power consumption to save power time or the reduction of on-time, such as the air conditioner is, determines and outputs a power savings as evaluable data.

The power consumption reduction evaluation support apparatus according to the present invention provides an air conditioner or the like that should be operated in a normal mode in which ON / OFF is repeated between the first set temperature and the second set temperature. In the case of controlling to be operated in the power saving mode so as to maintain the off state for a predetermined time even when it becomes the power consumption reduction evaluation support device, when the air conditioner or the like is operated continuously Means for storing a temperature limit reachable temperature control target and a time constant of a temperature change of the temperature control target during operation of the air conditioner, and the air conditioner when the first set temperature is reached Means for measuring a first time from when the power is turned off to the second set temperature, and from when the air conditioner is turned on after the predetermined time has elapsed until the first set temperature is reached. Means for measuring a second time, and the temperature control And when the second set temperature is reached based on the environment temperature, the limit temperature, the time constant, the first set temperature, and the second set temperature. Means for calculating a virtual time from the previous second set temperature to the first set temperature when it is assumed that the air conditioner is turned on, the first time, the predetermined time, Based on the second time and the virtual time, the power-saving mode is a reduction amount of the on-time of the air conditioner or the like when compared with the normal mode. having a power-saving power amount is a reduction amount of, and means for outputting the calculated power consumption reduction as evaluable data.

Another power consumption reduction evaluation support apparatus according to another aspect of the present invention measures a first time from when the air conditioner or the like is turned off when the first set temperature is reached until the second set temperature is reached. Means for measuring the second time from when the air conditioner or the like is turned on after the predetermined time has elapsed until the first set temperature is reached, and during the repetition of ON / OFF of the air conditioner or the like When it is detected that the second set temperature has been reached at least once, the air conditioner or the like is immediately turned on, and a third period from when the air conditioner or the like is turned on until the first set temperature is reached. Based on the first time, the predetermined time, the second time, and the third time, the air conditioner or the like when compared with the normal mode in the power saving mode based on the first time, the predetermined time, the second time, and the third time Power saving time or previous amount of reduction of on time The power-saving amount which is the amount of reduction power consumption by reducing the on time of the air conditioner or the like, and means for outputting seeking power savings as evaluable data.

  The outputting means displays data indicating the power consumption reduction amount on the display screen.

The power control apparatus according to the present invention is configured so that an air conditioner or the like to be operated in a normal mode in which ON / OFF is repeated between the first set temperature and the second set temperature is predetermined even when the second set temperature is reached. A power control apparatus that controls to be operated in a power saving mode so as to maintain a time-off state, and maintains the off-state for a predetermined time even when the second set temperature is reached, and after a predetermined time has elapsed Control means for controlling to turn on; means for calculating a first time from when the first set temperature is reached and the air conditioner is turned off until the second set temperature is reached; Means for calculating a second time from when the air conditioner or the like is turned on after the elapse of time until the first set temperature is reached, and at least once in the repetition of on / off of the air conditioner or the like. Detected that the set temperature was reached Means for immediately turning on the air conditioner, etc., and calculating a third time from when the air conditioner etc. is turned on until the first set temperature is reached; and the first time and the predetermined time Based on the second time and the third time , a power saving time that is a reduction amount of an on time of the air conditioner or the like when compared with the normal mode in the power saving mode or an on time of the air conditioner or the like having a power saving amount is the reduction of power consumption by reducing, and means for outputting seeking power savings as evaluable data.

  According to the present invention, it is possible to accurately evaluate a power saving amount of an air conditioner or the like operated in a power saving mode, and for example, it can be applied to an evaluation of a carbon dioxide reduction amount due to power saving.

  FIG. 1 is a block diagram of an air conditioning system CS using a power control device 12 according to an embodiment of the present invention, FIG. 2 is a diagram illustrating an example of a change in room temperature Y by the air conditioning system CS, and FIG. It is a figure which shows the mode of the change of the room temperature Y at the time of the power saving mode operation | movement of the air conditioner 11 of an on-off control system by. 2 and 3 show the case where the air conditioner 11 is used for indoor cooling.

  In FIG. 1, the air conditioning system CS includes an air conditioner 11 and a power control device 12. The air conditioner 11 is a known device including a compressor, a heat exchanger, an operation unit, a control unit, and the like. Usually, the compressor is provided in the outdoor unit, and the heat exchanger and the operation unit are provided in the indoor unit. The air conditioner 11 and the power control device 12 are connected to an AC power source by breakers CB1, CB2, and the like.

  The air conditioner 11 includes an on / off control type that controls on / off of the motor M of the compressor and an inverter control type that controls the rotational speed of the motor M using an inverter.

  In the air conditioner 11 of the on / off control system, the compressor motor M is on / off controlled by the electromagnetic switch R so that the set temperature is reached during the operation. When the air conditioner 11 is controlled by the power control device 12, electric wires are connected to a circuit inside the air conditioner 11 so that a signal to be described later is exchanged between them.

  In the inverter control type air conditioner, during the operation, the compressor motor is normally always turned on, and the rotation speed is controlled so as to reach the set temperature. Usually, an air conditioner is provided with a remote control terminal defined by JAM-A. The motor can be forcibly turned off by connecting an electric wire to this remote control terminal and sending an appropriate signal.

  The power control device 12 can be operated in the same manner for both the on / off control method and the inverter control method. Hereinafter, the on / off control method will be described as an example.

  The power control device 12 includes a mode switching unit 20, a detection unit 21, a forced signal output unit 22, a temperature detection unit 23, a timer 24, a processing unit 25, a display unit 26, and the like. Further, the power control device 12 has an interface (not shown) for transmitting data wirelessly to a counting device described later.

  The mode switching unit 20 is used to switch between the normal mode and the power saving mode in accordance with a user operation or a signal from the counting device.

  The detection unit 21 detects whether the motor M of the compressor of the air conditioner 11 is off or on. As a detection method, the voltage at both ends of the coil of the electromagnetic switch R is monitored to detect whether the electromagnetic switch R is off or on, the connection state of the contact of the electromagnetic switch R is monitored, and the electromagnetic switch R Various methods such as a method for detecting whether the motor M is off or on and a method for monitoring the current flowing through the motor M to detect whether the motor M is off or on are applicable. In order to monitor the voltage, current, connection state, and the like, the air conditioner 11 and the power control device 12 are connected by an electric wire, and the signal S1 obtained by the monitoring is input to the power control device 12.

  The forced signal output unit 22 outputs a signal S <b> 2 for forcibly turning off the power of the motor M to the air conditioner 11. The timing at which the signal S2 is output is when detection by the detection unit 21 is performed. The output of the signal S2 is stopped after a predetermined time Ts counted by the timer 24 has elapsed. The air conditioner 11 forcibly turns off the electromagnetic switch R by the signal S2, or turns off the motor M by another control device. Since the motor M is forcibly turned off immediately after the motor is turned on, the motor M is not substantially different from that in which the motor M is continuously kept off. Therefore, there is almost no increase in the burden on those devices, the motor M, and the compressor. In addition, although the power supply of the motor M or the electromagnetic switch R was turned on / off, the whole air conditioner 11 may be turned on / off. The time Ts measured by the timer 24 can be set by the user. The time Ts is normally set to about 2 to 5 minutes, for example.

  The temperature detector 23 detects the ambient temperature outside the room. The outdoor temperature affects the on-time of the motor M during cooling, and is necessary for estimating the operation time of the motor M in the normal mode, which will be described later.

  The timer 24 counts on and off of the motor M by the signal S1 input from the air conditioner 11 to the detection unit 21, and also counts the time Ts and causes the forced signal output unit 12 to output the signal S2. . The timer 24 outputs each time measurement result to the processing unit 25 after each time measurement.

  The processing unit 25 detects the outdoor ambient temperature detected by the temperature detection unit 23 as a result of each time measurement by the timer 24, and the characteristic value of the temperature adjustment target room previously input and stored in the memory ("time" to be described later) Data processing such as calculating and outputting the power saving time in the power saving mode compared with the normal mode from the “constant” and “lower limit temperature”). The processing unit 25 includes an MPU, a ROM, a RAM, an interface that performs input / output with a counting device, and the like.

  The display unit 26 displays a result of data processing performed by the processing unit 25, and is configured by an LCD (Liquid Crystal Display) or a CRT. The display unit 26 displays, for example, the total operation time of the air conditioner 11, the power saving amount in the total operation time, the cost reduction amount obtained by multiplying the power saving amount by the unit price of power, and the like.

  Next, the operation of the air conditioner 11 controlled by the power control device 12 will be described.

  In FIG. 2, it is assumed that the mode is the normal mode until time t5, but is switched to the power saving mode at time t5.

  As shown in FIG. 2, when the motor M is turned on at time t0 and the air conditioner 11 begins to operate, the room temperature Y decreases with time t. In the normal mode, when the lower limit set temperature YLo is reached at time t1, the motor M is turned off and the room temperature Y rises. When the room temperature Y reaches the upper limit set temperature YHi at time t2, the motor M is turned on and the room temperature Y is lowered. When the room temperature Y reaches the lower limit set temperature YLo at time t3, the motor M is turned off and the room temperature Y rises. Such control is repeated.

  After time t5 in the power saving mode, the room temperature Y rises because the motor M is off. Even when the room temperature Y reaches the upper limit set temperature YHi at time t6, the motor M is not turned on, and the off state is maintained until the set time Ts elapses. At time t7 when the time Ts has elapsed, the motor M is turned on and the room temperature Y is lowered. When the room temperature Y reaches the lower limit set temperature YLo at time t8, the motor M is turned off and the room temperature Y rises. After the room temperature Y reaches the upper limit set temperature YHi at time t9, the motor M is turned on at time t10 when the time Ts has elapsed, and the room temperature Y drops. Such control is repeated.

  Thus, in the power saving mode, the motor M is kept off for the predetermined time Ts, so that the average room temperature Y slightly increases and the power consumption is reduced accordingly. That is, it is possible to save power by lowering the operation rate while keeping the set temperature of the air conditioner 11 as it is. Moreover, since the air conditioner 11 is stopped for a certain time Ts each time the room temperature Y reaches the upper limit set temperature YHi, the room temperature Y does not greatly deviate from the set temperature. In addition, since the number of times the motor M is turned on and off does not change substantially, the air conditioner 11 is not burdened. Moreover, since the ON / OFF cycle of the motor M becomes longer, the burden on the air conditioner 11 may be reduced.

  Next, how to obtain the power saving amount of the air conditioner 11 in the power saving mode compared with the normal mode will be described.

Referring to FIG. 3, the ratio of the motor M ON time per unit time (hereinafter, also referred to as “duty factor”) Dfo is the power saving mode.
Dfo = T2 ÷ (T1 + Ts + T2) (1)
It is represented by Here, T1 is the time from when the room temperature Y reaches the lower limit set temperature YLo and the motor M is turned off until it reaches the upper limit set temperature YHi, and T2 is the room temperature Y from when the motor M is turned on to the lower limit set temperature Y This is the time until the motor M is turned off after reaching YLo.

The duty factor Dfs when the air conditioner 11 is operated in the normal mode is
Dfs = Ta ÷ (T1 + Ta) (2)
It is represented by Here, Ta is the time required for the room temperature Y to fall from the upper limit set temperature YHi to the lower limit set temperature YLo.

Compared with the normal mode, when the air conditioner 11 is operated in the power saving mode, the on-time reduction time of the motor M is obtained by multiplying the operating time by the difference between the normal mode duty factor Dfs and the power saving mode duty factor Dfo. It is done. Therefore, the shortening time of turning on the motor M with respect to the time (T1 + Ts + T2) of one cycle (hereinafter referred to simply as “cycle”) until the room temperature Y in the power saving mode changes from the lower limit set temperature YLo to the lower limit set temperature YLo again. Te is
Te = (T1 + Ts + T2) × (Dfs−Dfo) (3)
Can be obtained.

  The time T1 and the time T2 in the equations (1) and (2) can be measured by the timer 24 in response to the signal S1 from the air conditioner 11. Time Ts is preset. However, in the process in which the motor M is operated and the room temperature Y is lowered, since the motor M is not switched on and off before and after the upper limit set temperature YHi, the signal S1 from the air conditioner 11 does not change and the timer 24 ( The time Ta in the equation (2) cannot be measured.

  By the way, the continuous ON time T of the motor M and the room temperature Y in the cooling by the air conditioner 11 have the following relationship.

Y = (Y1-Y0) * e ^{(-T / Tc)} + Y0 (4)
Here, Y1 is the temperature of the environment surrounding the room to be cooled (hereinafter also referred to as “environment temperature”), for example, the temperature of the outside air. Y0 is a lower limit temperature of the room temperature Y reached when the motor M is kept on when the environmental temperature is Y1. Tc is a time constant (also referred to as “device inertia”) representing the time response of temperature Y.

  The time constant is a value specific to a temperature-controlled room or the like (hereinafter also referred to as “room”), and is defined as follows.

If the amount of heat removed from the room by the air conditioner 11 per unit time is Qc, the time change dQ / dT of the amount of heat of the whole room is
dQ / dT = −Qc + k × A × (Y1-Y) (5)
Here, Q is the amount of heat, k is a constant representing the heat transfer characteristics of the room, and A is the heat transfer area of the room related to the movement of heat inside and outside the room. The second term on the right side of equation (5) is the amount of heat flowing from the environment of temperature Y1 into the lower temperature Y chamber. Qc is constant regardless of the environmental temperature Y1 and the room temperature Y.

  The time change dY / dT of the room temperature Y can be obtained by dividing the equation (5) by the heat capacity C of the entire chamber.

dY / dT = {− Qc + k × A × (Y1-Y)} ÷ C (6)
The equation (4) is obtained by integrating the equation (6), and obtaining the integration constant under the boundary condition that the room temperature Y is the environmental temperature Y1 when the time T is 0 and the room temperature Y is the lower limit temperature Y0 when the time T is infinite. can get. In the integral form of the equation (6), the constant corresponding to the time constant Tc of the equation (4) is C ÷ (k × A). That is, the time constant Tc is a constant determined by C, k, A inherent to the room.

FIG. 4 is a diagram showing an example of the relationship between time T and room temperature Y in equation (4).
In the equation (4), as described above, the time constant Tc takes a certain value specific to the chamber. Since the lower limit temperature Y0 is determined according to the environmental temperature Y1, the temperature lowering process in both the normal mode and the power saving mode can be expressed by equation (4). That is, the time Ta required for the room temperature Y to drop from the upper limit set temperature YHi to the lower limit set temperature YLo is the same in both the normal mode and the power saving mode.

  The reachable lower limit temperature Y0 and the time constant Tc are measured in advance by operating the air conditioner 11 when the air conditioner 11 is installed. In both cases, the motor M of the air conditioner 11 is continuously turned on, and the change in the room temperature Y with respect to the elapsed time T is measured and organized as data.

  A method in which the room temperature Y and the time change dY / dT of the room temperature Y are obtained from the data as the lower limit temperature Y0 and the room temperature Y is employed when the time change is below a certain value, or the time change of the room temperature Y is plotted It can be obtained by a method of drawing an extrapolation line in the time axis direction and employing the temperature indicated by the asymptote.

  The time constant Tc is calculated by calculating Tc for each elapsed time T measured by substituting each elapsed time T, the room temperature Y at that time, the environmental temperature Y1, and the lower limit temperature Y0 under the measurement conditions into the equation (4). A method in which the average of the calculated Tc is used as a time constant Tc, or a method in which the Tc obtained by regression analysis is changed to a linear expression using Tc as a coefficient for T from the equation (4) and the time constant Tc is used. , Can be obtained.

  Now, the time Ta can be obtained as follows using the equation (4).

That is, in FIG. 3, the lowering process BC of the room temperature Y from the upper limit set temperature YHi in the normal mode is considered as a part of the lowering process ABC from the state where the room temperature Y is the environmental temperature Y1 in FIG. Then, the time Td required for the room temperature Y to drop from the room temperature Y1 of A to the upper limit set temperature YHi of B is calculated from the equation (4):
Td = Tc × ln {(Y1-Y0) / (YHi-Y0)} (7)
It is represented by

In the lowering process ABC of the room temperature Y, when the on-time T of the motor M is Td + Ta, the room temperature Y becomes the lower limit set temperature YLo.
YLo = (Y1−Y0) × e ^{{− (Td + Ta) / Tc}} + Y0 (8)
When this expression is arranged with respect to time Ta,
Ta = Tc * [ln {(Y1-Y0) / (YLo-Y0)}
-Ln {(Y1-Y0) / (YHi-Y0)}] (9)
The time Ta can be obtained by substituting the measurable environmental temperature Y1, the reachable lower limit temperature Y0 at the environmental temperature Y1, and the time constant Tc obtained when the air conditioner 11 is installed in the equation (9).

  Therefore, the shortening time of the motor M on in the power saving mode in one cycle until the room temperature Y changes from the lower limit set temperature YLo to the lower limit set temperature YLo is obtained from the equations (1) to (3) using this time Ta. Can do. If the shortened time Te for each cycle in the power saving mode of the air conditioner 11 is obtained by the equation (3) and integrated, the total power saving time can be obtained.

  The total on time of the motor M in the total operation time of the air conditioner 11 in the power saving mode can be obtained from the integration of the time T2 for each cycle, and the total on time of the motor M when the total operation time is operated in the normal mode. The time can be obtained from the integration of the time Ta for each cycle.

  The amount of power saving in the power saving mode with respect to the normal mode can be obtained from the product of the driving current value of the motor M, the driving voltage, the power factor, and the power saving time.

  Next, the operation of the air conditioning system CS will be described.

  FIG. 5 is a flowchart showing the control operation during operation of the air conditioner 11 in the power saving mode by the power control device 12, and FIG. 6 is a flowchart showing the operation of the air conditioning system CS.

  In FIG. 5, when the detection unit 21 detects that the motor M of the air conditioner 11 is turned off for the first time (No in # 11), the storage area of each data of the processing unit 25 is initialized (# 12), and the timer 24 is reset ( Tm = 0), and starts measuring time T1 (# 13). That is, when the detection unit 21 detects that the motor M is turned off for the first time after the air conditioner 11 is started in the power saving mode or is switched from the normal mode to the power saving mode during operation, In # 11, it becomes no and progresses to step # 12.

  When the room temperature Y rises from the lower limit set temperature YLo to the upper limit set temperature YHi and the detection unit 21 detects that the motor M is turned on (Yes in # 14), the signal M is output to forcibly stop the motor M, and the timer The 24 time measurement results Tm are stored in the processing unit 25 as time T1, and at the same time, the time measurement results Tm are integrated into the integration time ST1 (# 15).

  The timer 24 is reset to start measuring a predetermined time Ts (# 16). When the time Ts elapses (Yes in # 17), the signal S2 is turned off, the motor M is turned on, and the timed result Tm is added to the accumulated time STs. Is accumulated. At this time, the environmental temperature Y1 is detected and stored in the processing unit 25 (# 18).

  The timer 24 is reset to start counting the on-time T2 of the motor M (# 19). When the room temperature Y is lowered to the lower limit set temperature YLo and the motor M is detected to be off (No in # 20), the time measurement result Tm of the timer 24 is stored in the processing unit 25 as the time T2, and the time measurement result Tm is accumulated. Accumulate to ST2. Then, the power saving time Te in one cycle is calculated from the equations (7), (1), (2), and (3), integrated to the integration time STe, and a variable N for counting the number of cycles is set to 1. Are added (# 21). When the number of cycles (variable) N reaches the set number of times Ns (Yes in # 22), the final accumulated times ST1, ST2, STs, STe of time T1, time T2, time Ts, and power saving time Te are output. (# 23). After outputting each accumulated time ST1, ST2, STs, STe, the storage area of the processing unit 25 is initialized (# 12), the power control of the air conditioner 11, the time measurement of each time T1, T2, Ts, and Te Repeat the calculation.

  In step # 23, display on the display screen of the display unit 26, printing by a printer, storage in a storage device inside the power control device 12, transmission to a totaling device connected to the power control device 12, etc. Done.

  As shown in FIG. 6, when the room temperature Y reaches the lower limit set temperature YLo by the operation of the air conditioner 11 (Yes in # 31), the air conditioning system CS turns off the motor M (# 32). When the room temperature Y reaches the upper limit set temperature YHi (Yes in # 33), if not in the power saving mode (No in # 34), the motor M is turned on (# 35). In the power saving mode (Yes in # 34), after the time Ts has passed (Yes in # 36), the motor M is turned on (# 35).

FIG. 7 is a diagram showing an example of the display screen HG1 on the display unit 26. As shown in FIG. The display screen HG1 displays the operation mode of the air conditioner 11, the ratio (duty factor) Dfo of the motor M on time, the total on time of the motor M, the power saving time, and the power saving amount. The power consumption reduction amount by the power saving mode can be evaluated by the displayed power saving time and power saving amount.
In addition, when the motor M is assumed to be operated in the normal mode, the ratio (duty factor) Dfs of the motor M on time and the total on time of the motor M are also displayed. The display screen HG1 can display a carbon dioxide reduction amount corresponding to the power saving amount. The carbon dioxide reduction amount is obtained by the processing unit 25 by multiplying the power saving amount by a carbon dioxide emission basic unit stored in advance, for example, 0.357 kg / kWh in 2003.

  The display screen HG1 in FIG. 7 displays the operation results of the air conditioner 11 when the time T1 is 5 minutes, the time T2 is 45 minutes, the time Ts is 5 minutes, and the time Ta is 35 minutes during operation in the power saving mode. Has been. The operation results displayed on the display screen HG1 in this case are the ratio of the time when the motor M is on 0.8181818, the total on time 2250 minutes (2.604167 hours) in the power saving mode, and the power saving time 156. compared with the normal mode. 25 minutes, and power saving amount 2604.167 Wh. In addition, as the power saving amount, an effective power amount considering the power factor (cos θ) of the motor M or the like can be displayed.

  The power control device 12 used at home or the like may be a simplified display unit 26 that displays the total operation time and the power saving amount.

  As shown in FIG. 8, in a business establishment where a plurality of air conditioning systems CS1 to CS3 are installed, each power control device 12B to D is connected to and managed by one aggregation device 13 by, for example, a wireless LAN. Is done. By centrally managing data such as the power saving amount transmitted from each of the power control devices 12 </ b> B to 12 </ b> D by the totaling device 13, it becomes possible to quickly grasp the power saving status of the entire office. The power control devices 12 </ b> B to 12 </ b> D can output a power saving amount or the like to the counting device 13 when an output request is issued from the counting device 13.

  Aggregation device 13 receives time T1, time T2, time Ts, etc. for each cycle from each power control device 12B-D, and time Ta, power saving time Te for each cycle of each power control device 12B-D in aggregation device 13 The power saving amount may be obtained. It is also possible to distribute the environmental temperature Y1 from the aggregation device 13 to each of the power control devices 12B to 12D. Further, different total time Ts, lower limit set temperature YLo, upper limit set temperature YHi, and the like are distributed from the totaling device 13 to each of the power control devices 12B-D, and the totaling device 13 uses the power control devices 12B-D. The operation can be individually controlled.

  In this way, by connecting the totaling device 13 and the power control devices 12B to 12D via the LAN, it is possible to efficiently manage the power saving situation and control the power control devices 12B to 12D.

  Further, a network radio (mesh network) using a small network radio device can be adopted as the connection means. By using network radio, it is possible to construct a wide range of networks at a low price, and also to realize no wiring, so that the aesthetics are neat.

  FIG. 9 is a diagram showing a change in the room temperature Y during the power saving mode operation of the air conditioner 11 according to another embodiment of the present invention, and FIG. 10 is a flowchart showing the operation of the power control apparatus in FIG.

  In FIG. 9, after the motor M cycle in the power saving mode is repeated a predetermined number of times Ns, the operation in the normal mode is forcibly performed once (EFG in FIG. 9), and the room temperature Y at that time is the upper limit set temperature YHi. The time T3 required for the temperature to fall to the lower limit set temperature YLo is measured with a timer.

  The power saving amount of the air conditioner 11 in the power saving mode compared with the normal mode is obtained as follows.

In the power saving mode, the total on time STv of the motor M when the cycle of the motor M is repeated a predetermined number of times Ns is:
STv = Σ _Ns T2 + T3 (10)
It is represented by Here, T3 is the time from when the motor M is turned on immediately after the room temperature Y rises to the upper limit set temperature YHi until the room temperature Y falls to the lower limit set temperature YLo and turns off.

The total on time STu of the motor M when it is assumed that the entire operation time in the power saving mode of the air conditioner 11 is operated in the normal mode is the time until the room temperature Y rises to the upper limit set temperature YHi after the motor M is turned off. If the time of T1 '
STu = T3 ÷ (T1 ′ + T3)
× {Σ _Ns (T1 + Ts + T2)} + T3 (11)
It is represented by Compared to the case of operating in the normal mode, the power saving time STe in the total operation time of the air conditioner 11 operated in the power saving mode is
STe = STu-STv (12)
It is represented by

  In FIG. 10, the steps # 41 to # 52 of the control operation of the air conditioner 11 by the power control device are slightly different from the contents of step # 42 of the initial setting, the environment temperature is not detected in step # 48, and This is the same as steps # 11 to # 22 of the control operation of the power control apparatus 12 in FIG. 5 except that the power saving time is not obtained for the individual cycles in step # 51.

  In the power control apparatus that performs the operation of FIG. 10, when the number of cycles N of the motor M reaches the set number of times Ns (Yes in # 52), the air conditioner 11 is operated once in the normal mode (# 53). ~ # 58). In this normal mode, the time T1 ′ until the room temperature Y reaches the upper limit setting temperature YHi from the lower limit setting temperature YLo is counted (# 53 to # 55), and the motor M is turned on when the room temperature Y reaches the upper limit setting temperature YHi. Then, the time T3 until the lower limit set temperature YLo is reached is measured (# 56 to # 58). When the motor M is turned off, the control operation in the normal mode is terminated, the power saving time STe is calculated by the equations (7) to (9), and the result is output (# 59). Then, the storage area of each data of the processing unit is initialized (# 42), and the control of the air conditioner 11 and the time measurement of each time T1, T2, Ts, T1 ′, T3 are repeated.

  In the control operation of FIG. 10, the environmental temperature may be detected, and the normal mode operation may be performed for one cycle when the rate of change of the environmental temperature exceeds a certain reference value. Then, in the evening when the environmental temperature changes drastically and the time T3 is likely to change, the number of operations in the normal mode can be increased, and a more accurate power saving amount can be obtained. Further, in FIG. 10, for each cycle of the motor M, each time T1, T2, Ts can be output to the totaling device connected to the power control device, and the power saving time STe can be calculated by the totaling device. In addition, the relationship between the power control device and the aggregation device can be configured in the same manner as the power control device 12.

  In the control operations in FIGS. 5 and 10, when the mode switching unit 20 switches from the power saving mode to the normal mode, an unoutputted power saving amount or an integrated value for each time is output according to the time measurement result so far. Can be configured.

  In the embodiment described above, the evaluation of the power saving amount in the power saving mode when the air conditioner 11 is used for cooling has been described. However, for the evaluation of the power saving amount in the power saving mode when the air conditioner 11 is used for heating. Can be applied similarly.

  In the operation in the power saving mode when the air conditioner 11 is used for heating, the relationship between the upper limit set temperature and the lower limit set temperature and the on / off of the motor M is opposite to that in the case of cooling. That is, when the motor M of the air conditioner 11 is turned off at the upper limit set temperature and heating is stopped, the room temperature starts to drop. The motor M is kept off even after the room temperature reaches the lower limit set temperature, and after a predetermined time has elapsed, the motor M is turned on and heating is resumed. Since the motor M is kept off for a predetermined time, the average room temperature Y is slightly lowered, the operating rate of the air conditioner 11 is lowered, and power can be saved.

  In the case where the power control device 12 is operated in the same manner as the control operation shown in FIG. 5 in the cooling, the relationship between the time T and the room temperature Y when the air conditioner 11 is continuously operated in the heating is expressed by equation (13). Is used.

Y = (Y0′−Y1 ′) × e ^{(−T / Tc)} + Y1 ′ (13)
Here, Y0 ′ is the temperature of the environment that takes heat away from the room to be heated, for example, the temperature of the outside air. Y1 ′ is an upper limit set temperature of the room temperature Y that is reached when the air conditioner 11 is continuously operated when the environmental temperature is Y0 ′. Assuming that the air conditioner 11 is immediately turned on at the lower limit set temperature, the time Ta ′ until the upper limit set temperature is reached follows the formula (13) according to the formulas (4), (7), (9) in the cooling. It can be derived by developing. The power saving time in the power saving mode can be obtained by applying the time Ta ′ to the equations (1) to (3).

  Further, the power saving time can be obtained by operating the power control device 12 in the same manner as the control operation shown in FIG. That is, when the number of cycles of the air conditioner 11 in the power saving mode reaches the set number of times, the cycle in the normal mode is performed once, and the time for raising the temperature from the lower limit set temperature to the upper limit set temperature is directly counted, The power saving time in the power saving mode can be obtained.

The embodiment described above can be applied to power control and evaluation of the power saving amount of refrigerators other than the air conditioner 11, a heat insulator, a heater, and the like.
In addition, the configuration, circuit, order of control, contents, timing, power saving amount, etc. of the whole or each part of the air conditioner 11, the power control device 12, and the air conditioning system CS are appropriately changed in accordance with the gist of the present invention. Can do.

It is a block diagram of an air-conditioning system using a power control device concerning an embodiment of the present invention. It is a figure which shows the example of the mode of a change of the room temperature by the air conditioning system. It is a figure which shows the mode of the change of the room temperature at the time of the power saving mode operation | movement of the air conditioner of an on-off control system by an electric power control apparatus. It is a figure showing the relationship between cooling time and room temperature. It is a flowchart which shows the control action at the time of the driving | operation by the power saving mode of the air conditioner by an electric power control apparatus. It is a flowchart which shows operation | movement of an air conditioning system. It is a figure which shows the example of the display screen in a display part. It is a figure which shows the wireless network of an electric power control apparatus and a totaling apparatus. It is a figure which shows the mode of the room temperature change at the time of the power saving mode driving | running of the air conditioner by other embodiment. 10 is a flowchart showing the operation of the power control apparatus in FIG. 9.

Explanation of symbols

11 Air Conditioner 12 Power Control Device 23 Temperature Detection Unit (Evaluation Support Device)
24 Timer (Evaluation support device)
25 Processing unit (storage device, evaluation support device)
T1 Time until the room temperature changes from the lower limit set temperature to the upper limit set temperature (first time)
T2 Time after the motor is turned on until the room temperature reaches the lower limit set temperature and the motor turns off (second time)
T3 Time until the room temperature falls from the upper limit set temperature to the lower limit set temperature (third time)
Ta Time until the room temperature falls from the upper limit set temperature to the lower limit set temperature (virtual time)
Tc Time constant Ts Predetermined time Y0 The lower limit of the room temperature that can be reached when the environmental temperature is Y1 (the limit temperature that can be reached)
Y1 Environment temperature YLo Lower limit set temperature (first set temperature)
YHi upper limit set temperature (second set temperature)

Claims (6)

An air conditioner or the like to be operated in a normal mode in which ON / OFF is repeated between the first set temperature and the second set temperature so as to maintain the OFF state for a predetermined time even when the second set temperature is reached. An evaluation support method for power consumption reduction when controlling to operate in a power saving mode ,
The limit temperature at which the temperature adjustment target can be reached when the air conditioner or the like is continuously operated, and the time constant of the temperature change of the temperature adjustment target at the time of operation of the air conditioner or the like are stored in a memory,
Measuring a first time from when the first set temperature is reached and the air conditioner is turned off to the second set temperature, and storing the measured time in a memory;
Measuring a second time from when the air conditioner or the like is turned on after the predetermined time has elapsed until the first set temperature is reached, and storing it in a memory;
Acquiring the ambient temperature of the air-conditioning target and storing it in a memory;
Based on the environmental temperature, the limit temperature, the time constant, the first set temperature, and the second set temperature, it is assumed that the air conditioner is turned on when the second set temperature is reached. In this case, a virtual time from the previous second set temperature to the first set temperature is calculated,
Based on the first time, the predetermined time, the second time, and the virtual time , the power saving time is a reduction amount of the on-time of the air conditioner or the like when compared with the normal mode in the power saving mode or power-saving amount which is the amount of reduction power consumption by reducing the on-time of such the air conditioner, determines and outputs a power savings as evaluable data,
An evaluation support method for power consumption reduction characterized by the above. An air conditioner or the like to be operated in a normal mode in which ON / OFF is repeated between the first set temperature and the second set temperature so as to maintain the OFF state for a predetermined time even when the second set temperature is reached. An evaluation support method for power consumption reduction when controlling to operate in a power saving mode ,
Measuring a first time from when the first set temperature is reached and the air conditioner is turned off to the second set temperature, and storing the measured time in a memory;
Measuring a second time from when the air conditioner or the like is turned on after the predetermined time has elapsed until the first set temperature is reached, and storing it in a memory;
The air conditioner etc. is turned on immediately after detecting that the second set temperature has been reached at least once in the ON / OFF repetition of the air conditioner etc., and the air conditioner etc. Measuring the third time until the set temperature of 1 is reached and storing it in the memory,
Based on the first time, the predetermined time, the second time, and the third time, a reduction amount of on-time of the air conditioner or the like when compared with the normal mode in the power saving mode the power-saving amount is the reduction amount of the power consumption due to a reduction in the power saving time or on such the air conditioner time, it determines and outputs a power savings as evaluable data,
An evaluation support method for power consumption reduction characterized by the above. An air conditioner or the like to be operated in a normal mode in which ON / OFF is repeated between the first set temperature and the second set temperature so as to maintain the OFF state for a predetermined time even when the second set temperature is reached. An evaluation support apparatus for reducing power consumption when controlled to operate in a power saving mode ,
Means for storing a temperature limit reachable temperature control target when the air conditioner is continuously operated, and a time constant of a temperature change of the temperature control target when the air conditioner is operated;
Means for measuring a first time from when the air conditioner or the like is turned off at the first set temperature to the second set temperature;
Means for measuring a second time from when the air conditioner or the like is turned on after the predetermined time has elapsed until the first set temperature is reached;
Means for obtaining the environmental temperature of the temperature control target;
Based on the environmental temperature, the limit temperature, the time constant, the first set temperature, and the second set temperature, it is assumed that the air conditioner is turned on when the second set temperature is reached. Means for calculating a virtual time from the previous second set temperature to the first set temperature when
Based on the first time, the predetermined time, the second time, and the virtual time , the power saving time is a reduction amount of the on-time of the air conditioner or the like when compared with the normal mode in the power saving mode or power-saving amount which is the amount of reduction power consumption by reducing the on-time of such the air conditioner, and means for outputting seeking power savings as evaluable data,
A power consumption reduction evaluation support apparatus characterized by comprising: An air conditioner or the like to be operated in a normal mode in which ON / OFF is repeated between the first set temperature and the second set temperature so as to maintain the OFF state for a predetermined time even when the second set temperature is reached. An evaluation support apparatus for reducing power consumption when controlled to operate in a power saving mode ,
Means for measuring a first time from when the air conditioner or the like is turned off at the first set temperature to the second set temperature;
Means for measuring a second time from when the air conditioner or the like is turned on after the predetermined time has elapsed until the first set temperature is reached;
The air conditioner etc. is turned on immediately after detecting that the second set temperature has been reached at least once in the ON / OFF repetition of the air conditioner etc., and the air conditioner etc. Means for measuring a third time until the set temperature reaches 1,
Based on the first time, the predetermined time, the second time, and the third time, a reduction amount of on-time of the air conditioner or the like when compared with the normal mode in the power saving mode the power-saving amount is the reduction amount of the power consumption due to a reduction in the power saving time or on such the air conditioner time, and outputting obtained as evaluable data power consumption reduction,
A power consumption reduction evaluation support apparatus characterized by comprising: The means for outputting displays data indicating a power consumption reduction amount on a display screen.
5. The power consumption reduction evaluation support apparatus according to claim 3 or 4. Power saving is performed so that an air conditioner or the like that should be operated in a normal mode that is repeatedly turned on and off between the first set temperature and the second set temperature maintains the off state for a predetermined time even when the second set temperature is reached. A power control device for controlling to operate in a mode ,
Control means for maintaining the off state for a predetermined time even when the second set temperature is reached, and for controlling to turn on after the predetermined time has elapsed;
Means for calculating a first time from when the first set temperature is reached and the air conditioner is turned off until the second set temperature is reached;
Means for calculating a second time from when the air conditioner or the like is turned on after the predetermined time has elapsed until the first set temperature is reached;
The air conditioner etc. is turned on immediately after detecting that the second set temperature has been reached at least once in the ON / OFF repetition of the air conditioner etc., and the air conditioner etc. Means for calculating a third time until a set temperature of 1 is reached;
Based on the first time, the predetermined time, the second time, and the third time, a reduction amount of on-time of the air conditioner or the like when compared with the normal mode in the power saving mode the power-saving amount is the reduction amount of the power consumption due to a reduction in the power saving time or on such the air conditioner time, and outputting obtained as evaluable data power consumption reduction,
A power control apparatus comprising: