JP2016223745A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To equalize life of a plurality of units of heating means while operating so that a power usage value does not exceed a target power usage value, in a facility for managing the power usage value.SOLUTION: A hot water storage type water heater 10 includes heating means 1a, 1b, 1c, 1d, a hot water storage tank 12 and the like. The heating means 1a, 1b, 1c, 1d include compressors 2a, 2b, 2c, 2d, control parts 3a, 3b, 3c, 3d and the like. The control parts 3a-3d calculate an integrated value in which the rotational frequency of the compressors 2a-2d is multiplied by operation time at the rotational frequency for each compressor. A control device 30 allows a storage device 32 to store the integrated value of the compressors 2a-2d. Also, the control device 30, in the case where a power suppression instruction signal is received from a power control board 50 during the operation of the heating means 1a-1d, selects the compressor for decreasing the output out of the compressors on the basis of the integrated value of the compressors 2a-2d. Then, the control parts 3a-3d decrease the output of the selected compressor.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a hot water storage type hot water heater provided with a plurality of heating means, and more particularly, to a hot water storage type hot water heater that is operated so that a power consumption value does not exceed a target power consumption value.

  In general, there are a wide variety of power contracts, but in facilities that require an electric capacity of approximately 50 kW or more, it is necessary to receive high-voltage power. The contract power for high-voltage power reception is calculated as the largest value among the maximum power consumption values for each month in the past year including the current month. Here, as the maximum power consumption value, the largest value in a month is adopted among the total power consumption in the facility measured every 30 minutes of the demand time limit. For this reason, once the basic charge has been updated based on the maximum value of power used, the updated basic charge will continue for a minimum of one year after that even if the power usage value falls below the maximum value. Will be.

  Therefore, in order to reduce the basic charge, it has been a problem to suppress the power consumption so as not to exceed the maximum power consumption value. As a conventional technique for solving such a problem, for example, a hot water storage hot water supply system described in Patent Document 1 is known. In the prior art, the electric power used is suppressed by stopping the operation in preference to the one with the long accumulated operation time among the plurality of heating means.

JP 2008-267708 A

  In the prior art described above, the operation is stopped with priority given to the long heating operation time among the plurality of heating means. However, since the operating rotational speed of the compressor constituting the heating means varies depending on the heating load, the outside air temperature, etc., it is often not the same among a plurality of compressors. For this reason, when a plurality of compressors are compared, the life of a compressor having a long accumulated operation time is not necessarily shortened, and there is a problem that a compressor having a short accumulated operation time may have a lifetime first.

  The present invention has been made to solve the above-described problems, and controls the operating state of a plurality of heating means to suppress the amount of electric power within an allowable range, and equalizes the life of each heating means. The purpose is to provide a hot water storage type hot water heater that can be used.

  The hot water storage type hot water heaters according to the present invention each have a compressor, a plurality of heating means for heating hot water by a heat pump cycle using the compressor as a drive source, and the number of rotations of the compressor of each heating means. Storage means for storing for each compressor an integrated value that is a value obtained by multiplying the operating time by the number of revolutions, receiving means for receiving a power suppression instruction signal from the outside, and power received by the receiving means during operation of each heating means When a suppression instruction signal is received, a compressor for reducing the output is selected from the compressors based on the integrated value of each compressor stored in the storage means, and the output of the selected compressor is reduced. Output control means.

  According to the present invention, it is possible to equalize the lives of a plurality of heating means while operating so that the used power value does not exceed the target used power value in a facility that manages the used power value.

It is a block diagram which shows the hot water storage type water heater by Embodiment 1 of this invention. It is a hardware block diagram which shows the control apparatus of the hot water storage type hot water heater by Embodiment 1 of this invention, and the control part of a heating means. It is a block diagram which shows the control part of the hot water storage type hot water heater by Embodiment 1 of this invention, and the control part of a heating means. In Embodiment 1 of this invention, it is a flowchart which shows an example of control of the hot water storage type hot water heater. It is explanatory drawing which shows the generation | occurrence | production days in a year of representative outside temperature based on the average temperature of Tokyo and Osaka. It is explanatory drawing which shows the driving | running time of the heating means in typical outside temperature. It is explanatory drawing which shows the ratio of the rotation speed of the compressor used by each representative outside air temperature, when the rotation speed of the compressor of 2 degreeC frosting period is 100%. It is explanatory drawing which shows the product which multiplied the operating time of the heating means shown in FIG. 6 and the ratio of the rotation speed of the compressor shown in FIG. 7 for each representative outside air temperature.

  Embodiments of the present invention will be described below with reference to the drawings. In each drawing used in this specification, common elements are denoted by the same reference numerals, and redundant description is omitted. Further, the present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention. Further, the present invention includes all combinations of configurations that can be combined among the configurations shown in the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hot water storage type water heater according to Embodiment 1 of the present invention. The hot water storage type water heater 10 boils low-temperature water such as city water into hot water and supplies it to a desired location. As shown in FIG. 1, for example, four heating means 1a, 1b, 1c, 1d, And a hot water storage tank unit 11. In addition, in FIG. 1, although the case where the hot water storage type water heater 10 was equipped with the four heating means 1a-1d was illustrated, this invention is not restricted to this but is equipped with two, three, and five or more heating means. It can also be applied to hot water storage water heaters.

  Each of the heating means 1a to 1d is a plurality of heat pump units each having a heat pump cycle, and heats (boils) hot water using the heat pump cycle. The heating means 1a includes a variable speed compressor 2a that drives a heat pump cycle, a control unit 3a that controls the compressor 2a, and an outside air temperature detection means 6a that detects the outside air temperature around the heating means 1a. ing. The control unit 3a includes a processor 4a and a memory 5a as shown in FIG. The processor 4a controls the compressor 2a based on a program stored in advance in the memory 5a, and controls the operation and stop of the compressor 2a, the rotational speed of the compressor 2a, and the electric power used. The specific functions of the control unit 3a will be described later.

  On the other hand, the heating means 1b includes a compressor 2b, a control unit 3b (processor 4b, memory 5b), and an outside air temperature detection means 6b, similarly to the heating means 1a. Similarly, the heating unit 1c includes a compressor 2c, a control unit 3c (processor 4c, memory 5c), and an outside air temperature detection unit 6c. The heating unit 1d includes the compressor 2d, control unit 3d (processor 4d, memory). 5d) and outside air temperature detection means 6d. The heat pump cycle mounted on these heating means 1a to 1d collects heat in the air into a heat medium such as a refrigerant by operating the compressors 2a to 2d, and the heat of the heat medium and the hot water storage tank unit. Heat exchange is performed with hot water supplied from 11. Thereby, the heating means 1a-1d heats the hot water supplied from the hot water storage tank unit 11, and produces | generates warm water.

  The hot water storage tank unit 11 includes a hot water storage tank 12 and a control device 30. The hot water storage tank 12 is a tank for storing hot water generated by the heating means 1a to 1d and supplying the hot water to an external hot water supply target. The hot water storage tank 12 is connected to the heating means 1 a to 1 d via the circulation pipe 21. In addition, although illustration is abbreviate | omitted in FIG. 1, the circulation piping 21 is a forward piping which introduces the hot water taken out from the lower part of the hot water storage tank 12 to a heating means with respect to each heating means 1a-1d, and heating. And a return pipe for returning the hot water generated by the means to the upper part of the hot water storage tank 12. The circulation pipe 21 is provided with a circulation pump (not shown) for circulating hot water in the hot water storage tank 12 to the heating means 1a to 1d.

  At the time of boiling operation, at least a part of the heating means 1a to 1d is operated by the control device 30. Further, the circulation pump is driven, and the hot water in the hot water storage tank 12 is circulated to the operating heating means. Thereby, the hot water taken out from the lower part of the hot water storage tank 12 is introduce | transduced into the heating means in operation via the going-out piping of the circulation piping 21. FIG. This hot water is heated by the heating means and then returned to the upper part of the hot water storage tank 12 via the return pipe. Thereby, hot water is stored in the hot water storage tank 12 by a temperature lamination type in which the hot water temperature increases toward the upper side. Therefore, according to the boiling operation, hot water can be stored in the hot water storage tank 12.

  The hot water storage tank 12 is provided with a plurality of tank temperature sensors (not shown) for detecting the hot water temperature in the tank at different heights. The detection result of each tank temperature sensor is used when the controller 30 calculates the remaining hot water amount in the hot water storage tank 12. On the other hand, the hot water storage tank unit 11 includes a hot water supply pipe 12 a for supplying hot water in the hot water storage tank 12 to an external hot water supply target, and a water supply pipe 12 b for introducing low-temperature water such as city water to the lower part of the hot water storage tank 12. Has been placed.

  Next, a control system of the hot water storage type hot water heater 10 will be described with reference to FIG. FIG. 2 is a hardware configuration diagram illustrating a control device for a hot water storage type hot water heater and a control unit for heating means according to Embodiment 1 of the present invention. The control device 30 controls the hot water storage type hot water heater 10 and includes a processor (CPU) 31 and a storage device 32 as a memory as shown in FIG. The processor 31 executes control of the hot water storage type water heater 10 based on a control program stored in advance in the storage device 32. This control includes the boiling operation and the like.

  The storage device 32 includes a ROM, a RAM, a nonvolatile memory, and the like. As will be described later, the storage device 32 stores the integrated values of the compressors 2a to 2d in an updatable manner. Note that the control device 30 may include a plurality of processors 31 or a plurality of storage devices 32. Further, the functions of the control device 30 may be realized by cooperation of a plurality of processors 31 and a plurality of storage devices 32.

  The control units 3a to 3d (processors 4a to 4d) of the heating units 1a to 1d are connected to the control device 30 via the HP communication line 22 so as to be able to communicate with each other, as shown in FIGS. In addition, in FIG. 2, control part 3a is illustrated among control parts 3a-3d. As shown in FIG. 1, the hot water storage type water heater 10 includes a remote controller 40 connected to the control device 30 through a remote control communication line 23 so as to be able to communicate with each other. The remote controller 40 is operated by the user to change the operating state of the hot water storage type hot water heater 10 and various set values. More specifically, the remote controller 40 includes a setting unit that can set a boiling temperature setting value, a target remaining hot water amount setting value, and the like, and a display unit that displays information received from the control device 30, the setting value, and the like. Yes. Operation information of the remote controller 40 by the user is transmitted to the control device 30 via the remote control communication line 23.

  The hot water storage type hot water heater 10 is connected to an external power control panel 50 through the control panel communication line 24 so as to be able to communicate with each other. The power control panel 50 comprehensively controls, for example, the power consumption value of electric devices including the hot water storage type water heater 10 installed in the facility. The power control panel 50 is constituted by, for example, a microcomputer having a processor and a memory similar to those of the control device 30. Then, the power control panel 50 has a function for measuring the used power value of the entire facility, a function for setting the target used power value of the used power value, and the measured used power value approaching the target used power value. And a function of transmitting a power suppression instruction signal to at least some of the electric devices. The power suppression instruction signal is a signal for instructing electric appliances to suppress power consumption, and is also transmitted to the control device 30 of the hot water storage type hot water heater 10 as necessary.

  Next, with reference to FIG. 3, a block diagram of the control device 30 of the hot water storage type hot water heater 10 and the control units 3a, 3b, 3c, 3d of the heating means 1a, 1b, 1c, 1d will be described. FIG. 3 is a block diagram showing a control device for a hot water storage type hot water heater and a control unit for heating means according to Embodiment 1 of the present invention. As shown in this figure, the control device 30 includes a signal receiving unit 100, an integrated value processing unit 101, an output control unit 102, and a life determination unit 103.

  The signal receiving unit 100 receives the power suppression instruction signal transmitted from the power control panel 50, and constitutes a specific example of the receiving means in the present embodiment. The signal receiving unit 100 transmits the power suppression instruction signal received from the power control panel 50 to the output control unit 102. The integrated value processing unit 101 receives, from the information transmitting / receiving unit 110, integrated values described later calculated by the integrated value calculating units 112 of the control units 3a to 3d, and stores the received integrated values of the compressors 2a to 2d in the storage device 32. To remember each.

  When the power control instruction signal is received by the signal receiving unit 100 during the operation of the heating units 1a to 1d, the output control unit 102 is based on the integrated values of the compressors 2a to 2d stored in the storage device 32. The compressor which reduces an output among each compressor is selected. And among the control parts 3a-3d of the compressors 2a-2d, a power suppression instruction | indication signal is transmitted only to the control part of the selected compressor, and it is a power suppression instruction | indication with respect to the control part of the compressor which was not selected. Do not send a signal. In the present invention, the “process for reducing the output of the compressor” may be either a process for stopping the compressor or a process for reducing the rotational speed of the compressor. Moreover, the selection method of the compressor which reduces an output is mentioned later.

  Further, the output control unit 102 transmits information related to the presence or absence of transmission of the power suppression instruction signal to the control units 3 a to 3 d of the compressors 2 a to 2 d to the remote controller 40. Thereby, the remote controller 40 displays whether each compressor 2a-2d is drive | operated in the state which suppressed the electric power used for every heating means 1a-1d. According to this control, it is possible to notify the user of the heating means that suppresses the power used. Thereby, it is possible to easily grasp which heating means is used to suppress the power consumption, and the convenience for the user can be improved.

  The life determination unit 103 determines the life of each compressor based on the integrated value of the compressors 2 a to 2 d stored in the storage device 32. More specifically, the life determination unit 103 determines that the life of the compressor has arrived when the integrated value of any of the compressors exceeds the reference value for determining the life. Then, the fact that the compressor has reached the end of life is transmitted to the remote controller 40.

  As a result, the remote controller 40 displays the identification information of the heating means (compressor) that has reached the end of life, such as “the heating means 1a is at the end of life”, and the fact that the compressor has reached the end of life. Inform. This notification operation is not limited to display, and synthesized speech may be used. In the notification operation, a buzzer sound, blinking of a lamp, or the like may be used in combination. According to this control, the user can easily grasp that the heating means has reached the end of life and which heating means has reached the end of the life. Therefore, the heating means can be properly maintained and the convenience for the user can be improved.

  Next, a block diagram of the control units 3a to 3d of the heating means 1a to 1d will be described. As shown in FIG. 3, the control units 3a, 3b, 3c, and 3d include an information transmission / reception unit 110, a rotation speed setting unit 111, and an integrated value calculation unit 112, respectively. In addition, in FIG. 3, control part 3a is illustrated among control parts 3a-3d. The information transmission / reception unit 110 has a function of receiving information from the control device 30 and a function of transmitting the integrated values of the compressors 2 a to 2 d to the integrated value processing unit 101 of the control device 30. Information received by the information transmitting / receiving unit 110 from the control device 30 includes a power suppression instruction signal transmitted from the output control unit 102 of the control device 30, a boiling temperature setting value set by the remote controller 40, and the like. The control device 30 transmits the information to the control units 3a, 3b, 3c, and 3d only when the current remaining hot water amount in the hot water storage tank 12 is less than the target remaining hot water amount. That is, if the current remaining hot water amount is equal to or greater than the target remaining hot water amount, the transmission of the information is not executed.

  The rotation speed setting unit 111 sets the rotation speeds of the compressors 2a to 2d and rotates the compressors 2a to 2d at the rotation speed. More specifically, the rotation speed setting unit 111 of the control unit 3a includes the presence / absence of a power suppression instruction signal transmitted from the output control unit 102 of the control device 30, the boiling temperature setting value, and the outside air temperature detection means 6a. Based on the detected outside air temperature, the rotational speed of the compressor 2a is set. Then, by outputting a drive signal corresponding to the set rotational speed to the compressor 2a, the compressor 2a is rotated at the rotational speed. Similarly, the rotation speed setting unit 111 of the control units 3b to 3d is based on the presence / absence of the power suppression instruction signal, the boiling temperature setting value, and the outside air temperature detected by the outside air temperature detecting means 6b to 6d. The rotation speeds of the compressors 2b to 2d are set, and the compressors 2b to 2d are rotated at the rotation speeds. In this way, when at least a part of the heating means 1 a to 1 d is activated, hot water is generated by the activated heating means, and the generated hot water is stored in the hot water storage tank 12.

  When the rotation speed setting unit 111 receives the power suppression instruction signal from the output control unit 102 of the control device 30, the rotation speed setting unit 111 rotates the rotation speeds of the compressors 2a to 2d at a lower speed than when the power suppression instruction signal is not received. Set to a number. This low rotational speed may be zero (stop of the compressor). Therefore, among the compressors 2a to 2d, the output of the compressor that the output control unit 102 has selected as the output reduction target is in a state of being suppressed more than the other compressors. In addition, the output control part 102 of the control apparatus 30 and the rotation speed setting part 111 of the control parts 3a-3d comprise the specific example of the output control means in this Embodiment.

  The integrated value calculation unit 112 calculates the integrated values of the compressors 2a to 2d. More specifically, the integrated value calculation unit 112 of the control unit 3a multiplies the rotation speed (rpm) of the compressor 2a by the operation time (min) at the rotation speed (rpm · min = r). ) As an integrated value of the compressor 2a. Similarly, the integrated value calculation unit 112 of the control units 3b to 3d multiplies the integrated value of the compressor 2b obtained by multiplying the rotational speed of the compressor 2b and the operating time, and the rotational speed of the compressor 2c and the operating time. The integrated value of the compressor 2c and the integrated value of the compressor 2d obtained by multiplying the rotational speed of the compressor 2d and the operation time are respectively calculated. The calculated integrated values of the compressors 2a to 2d are transmitted from the information transmitting / receiving unit 110 to the integrated value processing unit 101 of the control device 30 and stored in the storage device 32 as described above. The integrated value calculation unit 112 of the control units 3a to 3d, the integrated value processing unit 101 of the control device 30, and the storage device 32 constitute a specific example of the storage means in the present embodiment.

[Specific Processing for Realizing Embodiment 1]
Next, a specific process for realizing the above-described control will be described with reference to FIG. FIG. 4 is a flowchart illustrating an example of control of the hot water storage type hot water supply apparatus in the first embodiment of the present invention. Each process of the routine shown in this figure is executed by the control device 30 unless otherwise specified. In FIG. 4, first, in step S01, it is determined whether or not the current remaining hot water amount is less than the target remaining hot water amount. The current remaining hot water amount is calculated based on the detection result of each tank temperature sensor. Moreover, the target remaining hot water amount is set as the minimum remaining hot water amount, for example, in order to prevent running out of hot water. If the determination in step S01 is established, the process proceeds to step S02. If the determination in step S01 is not established, this routine is terminated.

  In step S02, since the amount of remaining hot water in the hot water storage tank 12 is small, the boiling operation is started, and the process proceeds to step S03. In step S03, in the control units 3a, 3b, 3c, 3d of the individual heating means 1a, 1b, 1c, 1d, compression is performed based on the boiling temperature set value and the detected outside air temperature by the outside air temperature detecting means. The rotational speed of the machines 2a, 2b, 2c, 2d is set. And control part 3a, 3b, 3c, 3d drives compressor 2a, 2b, 2c, 2d with the set rotation speed, and performs boiling operation. At this time, the rotation speed is set on the assumption that the power suppression instruction signal is not received.

  Next, in step S04, it is determined whether or not a power suppression instruction signal is received from the power control panel 50. When the determination in step S04 is established, it is necessary to perform the boiling operation in a state where the power used by the hot water storage type hot water heater 10 is suppressed. Therefore, in this case, the process proceeds to step S05. On the other hand, if the determination in step S04 is not established, it is not necessary to suppress power consumption, and the process proceeds to step S10 described later.

  In step S05, first, the integrated values are calculated by the control units 3a, 3b, 3c, and 3d. That is, by multiplying the rotation speed (rpm) of the compressors 2a, 2b, 2c, and 2d by the operation time (min) at the rotation speed, an integrated value (rpm · min.) Of the compressors 2a, 2b, 2c, and 2d is obtained. = R) is calculated. Then, the calculated integrated value is transmitted to the control device 30. Thereby, the control apparatus 30 memorize | stores the integrated value of compressor 2a, 2b, 2c, 2d in the memory | storage device 32, respectively. Moreover, the control apparatus 30 performs the process which determines the magnitude relationship of the integrated value of compressor 2a, 2b, 2c, 2d. Here, the determination process of the magnitude relation is to determine the order of the integrated values between the heating means 1a, 1b, 1c, and 1d by comparing the integrated values of the compressors 2a, 2b, 2c, and 2d with each other. To do. As an example, when the integrated value decreases in the order of the heating means 1a, 1b, 1c, and 1d, the magnitude relationship between the integrated values is determined as “1a> 1b> 1c> 1d”.

  Next, in step S06, it is determined whether or not a value obtained by subtracting the current remaining hot water amount from the target remaining hot water amount is smaller than a preset remaining hot water amount determination value. The remaining hot water amount determination value is set to a value of about 200 L, for example. When the determination in step S06 is established, it is determined that the target remaining hot water amount is almost achieved, and the process proceeds to step S07 in order to perform the heating means reduction process. On the other hand, if the determination in step S06 is not established, it is determined that the amount of boiling water required to achieve the target remaining hot water amount is large, and the process proceeds to step S08 to perform the heating means increasing process.

  In step S07, a heating means reduction process is executed. The heating means reduction process is performed when the number of heating means for reducing the output of the compressors 2a to 2d among the heating means 1a to 1d is increased in a state where the power suppression instruction signal is received from the power control panel 50. In this process, the output is reduced in order from the compressor having the largest integrated value. More specifically, in the state where the reception of the power suppression instruction signal is continued, the processes in steps S06 to S09 are repeated. At this time, in step S07, among the compressors 2a to 2d whose output has not yet been reduced, the output of the compressor having the largest integrated value is always reduced.

  Specifically, for example, in the first step S07 after receiving the power suppression instruction signal, the heating means 1a to 1d are selected from the heating means 1a to 1d based on the magnitude relationship of the integrated values “1a> 1b> 1c> 1d”. 1a is selected and the output of the compressor 2a is reduced. In step S07 for the second time after receiving the power suppression instruction signal, the heating means 1b is selected and the output of the compressor 2b is reduced. Similarly, in the third and fourth steps S07, the heating means 1c and 1d are sequentially selected, and the outputs of the compressors 2c and 2d are sequentially reduced. In addition, when reducing the output of a compressor, the rotation speed of a compressor may be reduced and a compressor may be stopped. Further, when the rotational speed is decreased, the rotational speed after the decrease is set by multiplying the rotational speed at the normal time (before the output decrease) by a coefficient smaller than 1 (for example, 0.5). May be.

  On the other hand, in step S08, a heating means increasing process is executed. The heating means increasing process increases the number of heating means for returning the compressors 2a to 2d from the low output state among the heating means 1a to 1d in a state where the power suppression instruction signal is received from the power control panel 50. In this case, the output is returned in order from the compressor having the smallest integrated value. More specifically, when the processes in steps S06 to S09 are repeated as described above, in step S08, the integrated value is always the highest among the compressors 2a to 2d whose output has already been reduced by the heating means reduction process. Restore the output of the small compressor (including starting from a stopped state).

  Specifically, for example, in the first step S08 after receiving the power suppression instruction signal, the heating means 1a to 1c are heated based on the magnitude relationship "1a> 1b> 1c> 1d". 1d is selected, and the output of the compressor 2d is restored to the normal rotation speed. In step S08 for the second time after receiving the power suppression instruction signal, the heating means 1c is selected and the output of the compressor 2c is restored. Similarly, in the third and fourth steps S08, the heating means 1b and 1a are sequentially selected, and the outputs of the compressors 2b and 2a are sequentially returned.

  Next, in step S09, it is determined whether or not the power suppression instruction signal from the power control panel 50 has ended. If the determination in step S09 is not established, the power suppression instruction signal is still in progress. Therefore, the processes in steps S06 to S09 are repeated until the power suppression instruction signal ends. Thus, during the continuation of the power suppression instruction signal, either step S07 (heating means decreasing process) or step S08 (heating means increasing process) is performed based on the magnitude relationship between the target remaining hot water amount and the current remaining hot water amount. Selected. Then, the outputs of the compressors 2a to 2d are reduced in descending order of the integrated value, or the outputs are returned in the order of increasing integrated value.

  At this time, in step S07, as long as there is a compressor that has received the power suppression instruction signal and the output has not been reduced, the process of decreasing the output of the compressor in descending order of the integrated value is repeated. According to the process of step S07, the output can be reduced first from the compressor having a large integrated value, that is, the compressor predicted to have a short life. In step S08, as long as the power suppression instruction signal is received and there is a compressor whose output is reduced, the process of returning the output of the compressor in order from the smallest integrated value is repeated. According to the processing in step S08, the output can be increased first from the compressor having a small integrated value, that is, the compressor predicted to have a long life.

  On the other hand, when the determination in step S09 is established, the process proceeds to step S10. In step S10, it is determined whether or not the current remaining hot water amount is equal to or greater than the target remaining hot water amount. If this determination is satisfied, the process proceeds to step S11 and the boiling operation is stopped. Moreover, when determination of step S10 is not materialized, it returns to step S04 and continues a boiling operation.

(Characteristics of integrated values used in this embodiment)
Next, the reason why the life of the compressors 2a to 2d is equalized by performing the control using the integrated value as described above in a state where the power suppression instruction signal is received will be described with reference to FIGS. explain. Note that the data shown in these drawings is an example in the present embodiment and does not limit the present invention. First, FIG. 5 is an explanatory diagram showing the annual number of days of occurrence of the representative outside air temperature based on the average temperatures in Tokyo and Osaka. According to this figure, the number of days in which the frosting period is 2 ° C is 26 days, the number of days in winter 7 ° C is 92 days, the number of days in intermediate 16 ° C is 113 days, and the number of days in summer 25 ° C is 134 days. It has become. FIG. 6 is an explanatory diagram showing the operation time of the heating means at the representative outside air temperature. According to this figure, the operation time at 2 ° C. in the frost period is 520 hours (ratio to the total operation time of the year is 13%), the operation time at 7 ° C. in the winter season is 1207 hours (ratio is 30%), and the intermediate period 16 The operating time at 1 ° C. is 1119 hours (ratio is 28%), and the operating time at 25 ° C. in summer is 1130 hours (ratio is 28%).

  FIG. 7 is an explanatory diagram showing the ratio of the rotational speeds of the compressors used at each representative outside air temperature when the rotational speed of the compressor at the frost period of 2 ° C. is 100%. Generally, the rotational speed of the compressor tends to be set lower as the outside air temperature is higher due to the characteristics of the heat pump cycle. According to FIG. 7, assuming that the rotation speed used at 2 ° C. in the frost period is 100%, the ratio of the rotation speed used at 7 ° C. in winter is 80%, and the ratio of the rotation speed used at 16 ° C. in the intermediate period is 60%, The ratio of the number of rotations used at 25 ° C. in summer is 30%. FIG. 8 is an explanatory diagram showing a product obtained by multiplying the operating time of the heating unit shown in FIG. 6 by the ratio of the rotation speed of the compressor shown in FIG. 7 for each representative outside air temperature. According to FIG. 8, the product of frosting period 2 ° C. is 52000 hours ·% (the ratio to the sum of the products of each representative outside air temperature is 21%), the product of winter 7 ° C. is 96559 hours ·% (ratio is 39%), The product of 16 ° C in the interim period is 67119 hours ·% (ratio is 27%), and the product of 25 ° C in summer is 33894 hours ·% (ratio is 14%).

  Generally, it is known that the heating means including a compressor has a shorter life as the product of the operation time of the heating means and the ratio of the number of rotations is larger. In a system in which a power suppression instruction signal is used, if the process of decreasing the output of the compressor is executed in order from the compressor with the longest accumulated operation time, the life of the compressor with the longer accumulated operation time may not necessarily be shortened. is there. As shown in FIG. 6, the ratio of the operation time of summer 25 ° C. to the total operation time of the year is about 28%, whereas the ratio of the product of the operation time and the rotation speed ratio is shown in FIG. The ratio of summer 25 ° C to the total value is 14%. Therefore, a divergence occurs between the life predicted from the total operation time and the life predicted from the product of the operation time and the rotation speed ratio. This indicates that the life of the compressor having a long accumulated operation time is not necessarily shortened when the process of decreasing the output of the compressor in order from the compressor having the long accumulated operation time is executed.

  In other words, in a system in which the power suppression instruction signal is used, based on the integrated value obtained by multiplying the rotation speed of the compressors 2a, 2b, 2c, and 2d by the operation time, the compressor outputs in order from the compressor having the largest integrated value. By executing the process of reducing the temperature, the lifetimes of the heating means 1a, 1b, 1c, and 1d can be equalized. Therefore, according to the present embodiment, in the facility that manages the power consumption value, the lifetime of the plurality of heating units 1a, 1b, 1c, and 1d is operated while the power consumption value does not exceed the target power consumption value. Can be aligned.

  In the first embodiment, the hot water storage type water heater 10 provided with four heating means is exemplified. Moreover, the case where the magnitude relationship of the integrated values is “1a> 1b> 1c> 1d” is illustrated. Furthermore, 2 ° C., 7 ° C., 16 ° C., and 25 ° C. are illustrated as specific values of each representative outside air temperature. However, these specific values are examples in Embodiment 1, and in the present invention, these specific values can be set arbitrarily.

  In the first embodiment, the integrated values of the compressors 2a, 2b, 2c, and 2d are calculated by the control units 3a, 3b, 3c, and 3d, and information about the calculated integrated values is transmitted to the control device 30. . However, the present invention is not limited to this. For example, the control units 3a, 3b, 3c, and 3d transmit information on the rotational speeds and operating times of the compressors 2a, 2b, 2c, and 2d to the control device 30, and the control device 30 May calculate the integrated value based on this information.

1a, 1b, 1c, 1d Heating means 2a, 2b, 2c, 2d Compressors 3a, 3b, 3c, 3d Controllers 4a, 4b, 4c, 4d Processors 5a, 5b, 5c, 5d Memory 6a, 6b, 6c, 6d Outside air temperature detection means 10 Hot water storage type water heater 11 Hot water storage tank unit 12 Hot water storage tank 12a Hot water supply pipe 12b Hot water supply pipe 21 Circulation pipe 22 HP communication line 23 Remote control communication line 24 Control panel communication line 30 Controller 31 Processor 32 Storage device (storage means)
40 Remote controller 50 Power control panel 100 Signal receiving section (receiving means)
101 Integrated value processing unit (storage means)
102 Output control unit (output control means)
103 life determination unit 110 information transmission / reception unit 111 rotation speed setting unit (output control means)
112 Integrated value calculation unit (storage means)

Claims (5)

A plurality of heating means each having a compressor and heating hot and cold water by a heat pump cycle using the compressor as a drive source;
Storage means for storing, for each compressor, an integrated value that is a value obtained by multiplying the rotation speed of the compressor of each heating means by the operation time at the rotation speed;
Receiving means for receiving an external power suppression instruction signal;
When the power suppression instruction signal is received by the receiving unit during the operation of each heating unit, the output is output from the compressors based on the integrated value of the compressors stored in the storage unit. An output control means for selecting a compressor that reduces the output, and reducing the output of the selected compressor;
Hot water storage water heater equipped with.   In the state where the power suppression instruction signal is received by the receiving unit, the output control unit is a compression unit having a large integrated value when increasing the number of compressors whose output is reduced among the compressors. The hot water storage type hot water supply device according to claim 1, wherein the output is reduced in order from the machine.   In the state where the power suppression instruction signal is received by the receiving unit, the output control unit increases the number of compressors to be returned from the low output state among the compressors. The hot water storage type hot water supply device according to claim 1 or 2, wherein the output is restored in order from a small compressor. It has a remote controller for operating the hot water storage water heater,
The hot water storage hot water supply apparatus according to any one of claims 1 to 3, wherein the remote controller displays, for each of the heating means, whether or not the compressor is operated in a state in which power consumption is suppressed. It has a remote controller for operating the hot water storage water heater,
The hot water storage system according to any one of claims 1 to 4, wherein when the integrated value of the compressor is increased from a reference value for determining the life, the remote controller notifies the arrival of the life. Water heater.

Images