JP2006017434A - Heat pump water heater system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump water heater system avoiding complete service interruption by suppressing a quantity of electricity of a master breaker within a tolerance, and capable of continuing operation of a load apparatus as much as possible. <P>SOLUTION: The heat pump water heater system receiving supply of electric power from a branch breaker connected to a secondary side of the master breaker is characterized in that a control means is provided for detecting the quantity of electricity correlated to a current flowing through the master breaker, and limiting electric power consumption of the other load apparatus receiving supply of electric power from the branch breaker or another branch breaker connected to the secondary side of the master breaker such that a detected value of the quantity of electricity does not exceed a tolerance value. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat pump hot water supply system provided with a load facility.

  Conventionally, in order to suppress the total power failure due to the interruption of the main breaker, the amount of electricity (for example, current and apparent power) that correlates with the current flowing to the main breaker is monitored, and when this amount of electricity exceeds the allowable value, the priority order Accordingly, the power supply to the load device connected to the branch breaker is stopped (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-122801

  However, according to such a method, for example, when a part of the electrical appliances that are load equipment in all electrified houses consumes peak power and the amount of electricity of the main breaker exceeds an allowable value, a specific branch is generated. Since energization to the electrical appliance connected to the breaker is interrupted, there is a problem that the electrical appliance that is interrupted cannot be used.

  In particular, when a heat pump type water heater with high power consumption is provided, it is not preferable that all other electrical appliances are stopped and cannot be used. In addition, there are electrical appliances that want to continue operation as much as possible if the allowable value of the main breaker is sufficient.

  It is an object of the present invention to suppress the amount of electricity of the main breaker within an allowable range to avoid a total power failure and to continue the operation of the load device as much as possible.

  In order to solve the above-described problems, the present invention detects an amount of electricity that correlates with a current flowing through a main breaker in a heat pump hot water supply system that receives power from a branch breaker connected to the secondary side of the main breaker. Control means to limit the power consumption of the branch breaker connected to the secondary side of the main breaker or other load equipment that receives power supply from other branch breakers so that the detected amount of electricity does not exceed the allowable value It is provided.

  In other words, based on the detection value of the amount of electricity flowing to the main breaker, the heat pump operation is continued and the power consumption of other load devices is reduced, so that the amount of electricity flowing to the main breaker is kept within an allowable range, and further possible As long as it is possible to avoid the operation stop of other load devices. As a result, the desired load device can be operated with a constant capacity, and hot water can be continuously supplied by the heat pump water heater.

  In this case, it is preferable that the control means controls the limit amount of power consumption of other load devices in accordance with the ratio of the detected value to the allowable value of the amount of electricity. Specifically, the control unit includes an allowable value setting unit that sets an allowable value, and a set value setting unit that sets a set value of the amount of electricity that flows to the main breaker based on the set allowable value. When the detected value reaches the set value, the power consumption of other load devices is controlled to a preset limit amount. Here, it is preferable to set a plurality of setting values step by step.

  A room air conditioner can be given as another load device that wants to continue operation as much as possible. Further, the limit amount of other load devices may be determined according to the amount of power obtained by subtracting the power consumption of the heat pump from the allowable value. Moreover, you may make it include at least one of a floor heater and a bathroom dryer.

  Furthermore, in the case of a heat pump hot water supply system equipped with a hot water tank that stores hot water heated to a predetermined temperature by the refrigerant circulating in the heat pump, the detected value of the electric quantity correlated with the current flowing through the main breaker is the allowable value of this electric quantity. Control means may be provided for controlling hot water supply from a hot water tank instead of hot water supply by a heat pump when a set value determined based on the above is reached.

  That is, when the amount of electricity flowing to the main breaker rises and reaches a set value, the main breaker is controlled by switching to a mode in which the hot water stored in the hot water tank is discharged in place of the heat pump with large power consumption. It is possible to suppress the amount of electricity in the allowable range and to suppress changes in the state of the hot water with the water heater. Moreover, according to this, the other load apparatus which can be drive | operated can be increased.

  When the detection value reaches the set value after switching from the hot water storage tank to the heat pump hot water, other branch breakers connected to the secondary side of the main breaker or other branch breakers that receive power supply The power consumption of the load device can be limited.

  According to the present invention, the amount of electricity of the main breaker can be controlled within an allowable range to avoid a total power failure, and the operation of the load device can be continued as much as possible.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a first embodiment of a heat pump water heater system and peripheral devices to which the present invention is applied.

  As shown in the figure, the peripheral device includes a main breaker 1 connected to a single-phase three-wire system power supply, and detection means 2a for detecting an electric quantity (current or apparent power) correlated with a current flowing through the main breaker 1. 2b, branch breakers 3a, 3b connected to the secondary side of the main breaker 1, room air conditioners 13a, 13b connected to the branch breakers 3a, 3b, and power consumption of the room air conditioners 13a, 13b are controlled and branched. Control detection means 4a, 4b for detecting the amount of electricity (current or apparent power) correlated with the current of the breakers 3a, 3b, floor heater control means 9 for controlling the floor heater 11, and bathroom dryer 12 are controlled. And a bathroom dryer control means 10.

  On the other hand, the heat pump type hot water supply system 5 of the present embodiment sets the allowable value of the electric quantity correlated with the branch breaker 3c connected to the secondary side of the main breaker 1, the hot water supply system microcomputer 6, and the main breaker current. An allowable value setting means 7 and a heat pump type water heater 8 are provided.

  A heat pump hot water heater 8 is connected to the branch breaker 3c, while a floor heater control means 9 and a bathroom dryer control means 10 are connected to the branch breaker 3c. That is, the current flowing through the branch breaker 3c is distributed according to the power consumption of each load device. The detection means 2a, 2b and the control detection means 4a, 4b are all connected to the hot water supply system microcomputer 6, and the current or apparent power detected by each detection means is input to the hot water supply system microcomputer 6. Yes. The hot water supply system microcomputer 6 is connected to the floor heater control means 9, the bathroom dryer control means 10, and the control detection means 4a and 4b, respectively, and based on the command transmitted from the hot water supply system microcomputer 6, the consumption of each load device The power is controlled.

  Next, the heat pump type water heater 8 of FIG. 1 will be described in detail with reference to FIG. FIG. 2 is a configuration diagram illustrating an example of the heat pump type hot water heater 8. As shown in the figure, the heat pump type hot water heater 8 includes a heat pump cycle 21, a hot water tank 22, and a pump 23. The heat pump cycle 21 is composed of, for example, a closed circuit in which an evaporator, an expansion valve, a heat exchanger, and a compressor are sequentially connected by piping, and a refrigerant is sealed in the closed circuit. The water stored in the hot water tank 22 is extracted from the bottom of the hot water tank 22 by the pump 23 and led to the heat exchanger of the heat pump cycle 21. The hot water generated by heating is supplied to the top of the hot water tank 22 through the hot water supply pipe 25 and the valves 26 and 27 with the valve 28 closed. Thereby, a circulation channel is formed, and hot water of a predetermined temperature is stored in the hot water storage tank 22. On the other hand, water supplied from a water source such as a water supply through the water supply pipe 24 is heated in a heat exchanger, and with the valve 27 closed, the water is discharged from a faucet or the like through the hot water pipe 25 via the valves 26 and 28. It is like that. According to this embodiment, when the hot water heated by the heat pump cycle 21 is not directly discharged, the hot water storage tank 22 can be reheated and hot water at a predetermined temperature can be stored.

  Next, the operation of the present embodiment will be described with reference to FIG. FIG. 3 shows how each current or apparent power changes with the passage of time on the horizontal axis in the heat pump water heater, the room air conditioner 13, the floor heater 11, and the bathroom dryer 12, and in these load devices It is a diagram which shows a mode that the ratio which the sum total of an electric current or apparent power occupies for the allowable value of a master breaker changes with time passage.

  First, from time t0 to t1, the room air conditioners 13a and 13b (hereinafter abbreviated as 13), the floor heater 11 and the bathroom dryer 12 all perform normal operation, and the heat pump hot water heater 8 is stopped. . Since the operation of the room air conditioner 13, the floor heater 11, and the bathroom dryer 12 at this time is stable, each current or apparent power, and the current or apparent power flowing through the main breaker 1 that is the sum of these, It is constant.

  Here, when the heat pump type hot water heater 8 starts operation at the time t1, the current or the apparent power flowing through the heat pump type hot water heater 8 increases as shown in the figure, and accordingly, the current or the apparent power flowing through the main breaker 1 is also increased. Increase as shown. On the other hand, the hot water supply system microcomputer 6 sets the set values of the main breaker 1 in advance, for example, 100%, 95%, 90%, and 80% from the allowable values determined by the allowable value setting means 7, respectively. . The hot water supply system microcomputer 6 detects the current or the apparent power flowing through the main breaker 1 from the detection means 2a, 2b (hereinafter abbreviated as 2) after the heat pump type hot water heater 8 starts operation, and the main breaker 1 When the current or the apparent power flowing in the room reaches the set value 80% previously determined, the control detection means 4, the operation of the room air conditioner 13, the floor heater 11 and the bathroom dryer 12 is reduced so that the power consumption is reduced. An operation suppression signal is output to the floor heater control means 9 and the bathroom dryer control means 10 (time t2).

  When this operation suppression signal is input, for example, if the room air conditioner 13 is in a heating operation, the room air conditioner 13 performs an operation with reduced power consumption by, for example, lowering the set temperature by a predetermined value. Further, instead of changing the set temperature of the room air conditioner 13, for example, control may be performed to directly reduce the rotational speed of a compressor (not shown) included in the room air conditioner 13.

  The floor heater 11 and the bathroom dryer 12 at time t <b> 2 stop operating in response to an operation suppression signal from the hot water supply system microcomputer 6. In the present embodiment, the operation of the floor heater 11 and the bathroom dryer 12 is controlled to be stopped at the time t2, but an operation for suppressing each power consumption step by step may be performed. In the present embodiment, the room air conditioner 13, the floor heater 11, and the bathroom dryer 12 are simultaneously controlled at time t2. However, priorities are set in advance for each device, and according to the priorities. You may make it perform load restriction | limiting or a stop. Further, the priority order can also be determined by the hot water supply system microcomputer 6 from the operation status of each device without setting the priority order in advance.

  Next, the power consumption of the heat pump type hot water heater 8 from time t2 to time t3 and t4 in FIG. 3 despite the operation of the room air conditioner 13, the floor heater 11, and the bathroom dryer 12 being suppressed at time t2. Further increases, the current or apparent power flowing through the main breaker 1 increases, and when this detected value reaches the limit value 90% previously determined by the hot water supply system microcomputer 6 (time t4), the hot water supply system microcomputer 6 Outputs a signal for further suppressing the operation of the room air conditioner 13 to the control detection means 4. When this operation suppression signal is input, the room air conditioner 13 performs an operation with lower power consumption, for example, by further lowering the set temperature by a predetermined value during the heating operation. Further, instead of changing the set temperature of the room air conditioner 13, for example, control may be performed to directly reduce the rotational speed of a compressor (not shown) included in the room air conditioner 13. Then, after time t4, when the current flowing through the main breaker 1 or the apparent power changes between the previously set limit value 90% to 95%, the room air conditioner continues the operation with reduced power consumption.

  In FIG. 3, the power consumption of the room air conditioner 13 is reduced from time t4 to time t6 and stabilized at time t6, and the heat pump type hot water heater 8 is changed to stable operation at time t5. Therefore, the current or apparent power flowing through the main breaker 1 is in a stable operating state between the allowable values 90% and 95% from time t6 to t7.

  When the operation of the heat pump type hot water heater 8 is stopped after the above operation, the current or the apparent power flowing through the heat pump type hot water heater 8 starts to rapidly decrease as shown in the figure (time t7), and accordingly, the main breaker 1 Similarly, the current or apparent power flowing through the current decreases. When the current flowing through the main breaker 1 or the apparent power further decreases and the detected value becomes less than the preset value 90%, the hot water supply system microcomputer 6 partially cancels the restriction on the power consumption of the room air conditioner 13. (Time t8).

  Next, the decrease in the power consumption of the heat pump type hot water heater 8 is larger than the increase in the power consumption of the room air conditioner 13, the current flowing through the main breaker 1 or the apparent power further decreases, and the current flowing through the main breaker 1 or When the apparent power is less than the preset value 80% previously determined, the hot water supply system microcomputer 6 outputs a signal for canceling the power suppression operation of the room air conditioner 13 to the control detection means 4, and the room air conditioner 13 returns to the normal operation. To do. At the same time, the hot water supply system microcomputer 6 sends a signal for canceling the suppression operation (operation stop) so as to restart the operation of the floor heater 11 and the bathroom dryer 12 that have been stopped. 9. Output to bathroom dryer control means 10 (time t10).

  Here, in FIG. 3, the normal operation return of the room air conditioner 13 and the resumption of the operation of the floor heater 11 and the bathroom dryer 12 are performed at the same time t10. You may make it carry out according to order. Further, this priority order may be determined in advance, and the operation priority of each device is determined based on the operation status and ambient environment information in the room air conditioner 13, the floor heater 11, and the bathroom dryer 12, etc. 6 may be determined.

  As described above, the hot water supply system microcomputer 6 monitors the current or apparent power flowing through the main breaker 1, the current or apparent power of the heat pump hot water heater 8, the floor heater 11, the bathroom dryer 12 and the room air conditioner 13. By controlling the operation of the room air conditioner 13, the floor heater 11, and the bathroom dryer 12 according to the current flowing through the main breaker 1 or the apparent power, priority is given to the operation of the heat pump water heater 8, and the main breaker 1 Is prevented from exceeding the allowable value of the main breaker 1, and the operation stop of each load device connected to the main breaker 1 can be avoided as much as possible.

  Here, the floor heater 11 and the bathroom dryer 12 are generally configured to be a part of the heat pump hot water supply system. For example, as shown in the present embodiment, the heat pump hot water heater including the hot water tank 22 is used. Control may be made so that the floor heater 11 and the bathroom dryer 12 are stopped in synchronism with the operation in which the hot water is discharged and stored. According to this, since the current and the apparent power flowing through the main breaker 1 can be reduced, the means for detecting the current and the apparent power flowing through the floor heater 11 and the bathroom dryer 12 can be omitted.

  In the present embodiment, the set value is set stepwise such that the current or the apparent power flowing through the main breaker 1 is 100%, 95%, 90%, 80%. The number of steps is not particularly limited. Such setting values and the number of steps may be arbitrarily set by the user.

  In the present embodiment, the same set value is used as the set value of the current or apparent power flowing through the main breaker 1 when starting the suppression operation of the load device and the set value when returning from the suppression operation. For example, hysteresis may be provided in the set values at the start and at the return to stabilize the control.

  Next, a second embodiment to which the present invention is applied will be described with reference to FIG. FIG. 4 is a diagram showing an example in which the hot water in the hot water storage tank 22 of the heat pump type hot water heater 8 is preferentially used in FIG. 3.

  First, from time t0 to t1, all of the room air conditioner 13, the floor heater 11, and the bathroom dryer 12 perform normal operation, and the heat pump hot water heater 8 is stopped. At this time, since the room air conditioner 13, the floor heater 11 and the bathroom dryer 12 are operating stably, each current or apparent power, and the current or apparent power flowing through the main breaker 1 which is the sum of them, are , Almost constant.

  Here, when the heat pump type hot water heater 8 starts operation at time t1, the current or the apparent power flowing through the heat pump type hot water heater 8 increases as shown in the figure, and accordingly, the current or the apparent power flowing through the main breaker 1 is also increased. Increase as shown. On the other hand, the hot water supply system microcomputer 6 predetermines the set values of the main breaker 1 from the allowable values determined by the allowable value setting means 7, such as 100%, 95%, 90%, and 80%, respectively.

  Then, after the heat pump type hot water heater 8 starts operation, the hot water supply system microcomputer 6 detects the current or apparent power flowing through the main breaker 1 from the detection means 2a and 2b, and the current or apparent power flowing through the main breaker 1 is first detected. When the set value 80% determined in the above is reached, the heat pump type hot water heater 8 reduces or stops the rotational speed of the compressor of the heat pump cycle 21, and uses the hot water stored in the hot water storage tank 22 in advance to discharge hot water. To do. According to this, for example, the current or the apparent power flowing through the main breaker 1 can be reduced by reducing or stopping the rotation speed of the compressor that consumes a large amount of power. The hot water supply operation of the water heater 8 can be performed stably (time t2 to t4).

  Here, when the heat pump type water heater 8 performs an operation in which the hot water in the hot water storage tank 22 is used preferentially, there are time restrictions depending on the internal volume of the hot water storage tank 22, the hot water temperature, the amount of hot water, the hot water temperature, etc. The system microcomputer 6 needs to know in advance whether or not the operation mode can be continued. For this reason, the hot water storage tank 22 is provided with a sensor for detecting the hot water temperature and the amount of hot water so that the hot water supply system microcomputer 6 can determine whether or not the operation mode can be used based on the information of the sensor. Whether or not the operation mode can be used is determined before and during the operation in the above mode. Moreover, the hot water supply system microcomputer 6 may calculate based on the data showing the driving | running state, and you may make it calculate the driving | running time of a driving | operation mode.

  Next, in the operation mode in which the hot water in the hot water tank 22 is used preferentially, as described above, there is a restriction on continuous use. (Time t4). In this case, the operation mode is switched so that the hot water supply system microcomputer 6 supplies hot water again by the heating operation by the heat pump cycle 21. As a result, the current or the apparent power flowing through the heat pump type hot water heater 8 rises again as shown in the figure, and the current or the apparent power flowing through the main breaker 1 also rises and exceeds a predetermined set value (time). t5). In addition, since the driving | running operation | movement similar to FIG. 3 is performed after time t5, the description is abbreviate | omitted.

  As described above, according to the present embodiment, the operation of the room air conditioner 13, the floor heater 11, and the bathroom dryer 12 is controlled according to the detected current or current flowing through the main breaker 1, and the heat pump type Since the hot water heater 8 is preferentially operated using hot water in the hot water storage tank 22, it is possible to prevent the current or apparent power flowing through the main breaker 1 from exceeding an allowable value and to stop the operation of the load device as much as possible. It can be avoided. In addition, the user can more stably perform the hot water supply operation without feeling uncomfortable such as a change in the hot water temperature and the amount of the hot water with stabilization of the hot water supply.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of 1st Embodiment of the heat pump type hot water heater system and its peripheral device which apply this invention. It is a figure which shows the structure of an example of the heat pump type water heater of FIG. In heat pump water heaters, room air conditioners, floor heaters and bathroom dryers, a diagram showing how each current or apparent power changes over time on the horizontal axis, and the sum of current or apparent power in these load devices It is a diagram which shows a mode that the ratio which occupies for the allowable value of a master breaker changes with time progress of a horizontal axis. It is a diagram which shows the example which uses hot water of the hot water storage tank of a heat pump water heater preferentially with respect to FIG. 3 concerning 2nd Embodiment to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Master breaker 2a, 2b Detection means 3a, 3b Branch breaker 4a, 4b Control detection means 5 Heat pump type hot water supply system 6 Hot water supply system control microcomputer 7 Allowable value setting means 8 Heat pump type hot water heater 9 Floor heater control means 10 Bathroom dryer control Means 11 Floor heater 12 Bathroom dryer 13a, 13b Room air conditioner

Claims (8)

In a heat pump hot water supply system that receives power supply from a branch breaker connected to the secondary side of the main breaker,
From the branch breaker connected to the secondary side of the main breaker or another branch breaker, an electric quantity correlated with the current flowing through the main breaker is detected and the detected value of the electric quantity does not exceed an allowable value. A heat pump hot water supply system provided with a control means for limiting power consumption of another load device that receives power supply. The heat pump hot water supply system according to claim 1, wherein the control means limits power consumption of another load device in accordance with a ratio of the detected value to the allowable value. The control means includes tolerance value setting means for setting the tolerance value, and setting value setting means for setting a setting value of the amount of electricity flowing to the main breaker based on the set tolerance value. 3. The heat pump hot water supply system according to claim 1, wherein when the amount detection value reaches the set value, the power consumption of the other load device is limited. The heat pump hot water supply system according to any one of claims 1 to 3, wherein a plurality of the set values are set stepwise. The heat pump hot water supply system according to any one of claims 1 to 4, wherein the other load device is a room air conditioner. The heat pump hot water supply system according to claim 5, wherein the other load device includes at least one of a floor heater and a bathroom dryer in addition to the room air conditioner. In a heat pump hot water supply system equipped with a heat pump that receives power supply from a branch breaker connected to the secondary side of the main breaker,
A hot water storage tank for storing hot water heated to a predetermined temperature by the refrigerant circulating in the heat pump, and a detection value of an electric quantity correlated with a current flowing through the main breaker is set to a set value determined based on an allowable value of the electric quantity. A heat pump hot water supply system, comprising: a control means for controlling the hot water in the hot water storage tank to be discharged in place of the hot water supply by the heat pump. The control means switches the hot water from the hot water storage tank to the hot water from the heat pump, and then the branch breaker connected to the secondary side of the main breaker or other branch when the detected value reaches the set value. The heat pump hot water supply system according to claim 7, wherein power consumption of another load device that receives power supply from the breaker is limited.

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