JP2019168133A - Hot water storage type hot water system - Google Patents

Abstract

To provide a hot water storage type hot water system capable of utilizing surplus electric power more effectively.SOLUTION: Control means supplements, if the surplus electric power becomes insufficient during the surplus electric power boiling-up operation, the deficiency with commercial electric power supplied from an electric power system. A surplus utilization mode is a mode in which a target heat storage amount is made larger than in a normal boiling-up mode. The control means comprises: first resetting means which resets, when it is predicted without using weather forecast information that the surplus electric power is available, the surplus utilization mode if a use time or use electric power amount of the commercial electric power in the surplus electric power boiling-up operation exceeds a first threshold; and second resetting means which resets, when it is predicted using the weather forecast information that the surplus electric power is available, the surplus utilization mode if the use time or use electric power amount of the commercial electric power in the surplus electric power boiling-up operation exceeds a second threshold.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hot water storage type hot water supply system.

  In houses, facilities, etc. equipped with solar power generators, in order to utilize surplus power generated by the solar power generators, the hot water storage water heater is heated up and stored in the hot water storage tank as thermal energy. Saving is done. In the system disclosed in Patent Document 1, during boiling operation using photovoltaic power, household power is reduced due to temporary cloudiness, etc., or home appliances that have not been predicted are used. If the power used from the commercial power source is increased due to an increase in the internal power consumption, and the power purchase amount exceeds a predetermined value, the boiling operation is suppressed or stopped to suppress an increase in the power purchase fee. .

International Publication No. 2017/090180

  However, in the hot water storage hot water supply system such as Patent Document 1, when the amount of power purchased from the commercial power source is equal to or greater than a predetermined value, the boiling operation is suppressed or stopped, but if this predetermined value is set small, Effective use of photovoltaic power generation when solar power generation has been suppressed or stopped due to a decrease in photovoltaic power generation due to temporary cloudiness, etc. Can not do it.

  In addition, when the photovoltaic power generation increases due to weather recovery, etc., even when the suppression or stoppage of the boiling operation is canceled, when the photovoltaic power generation repeatedly increases or decreases due to unstable weather, etc. The heating operation repeats the accelerated state, the suppressed state, or the stopped state, causing a decrease in heating performance due to a rise loss of the heat pump unit or the like, and a decrease in the life of components related to the boiling operation.

  In addition, when the amount of electricity purchased from the commercial power source exceeds a predetermined value, the boiling operation is suppressed or stopped. However, if this predetermined value is set to a large value, the weather changes continuously to rain, etc. When the power continuously decreases, it takes time until the boiling operation is suppressed or stopped, and during this time, power is purchased from the commercial power source, and the power purchase fee is increased.

  An object of this invention is to provide the hot water storage type hot-water supply system which can utilize surplus electric power more effectively.

  A hot water storage type hot water supply system according to the present invention includes a hot water storage tank, a heating means for consuming electric power to heat water, and a control means for controlling a boiling operation for heating the water in the hot water storage tank by the heating means. The hot water supply system is capable of performing surplus power boiling operation, which is a boiling operation using surplus power out of the power generated by the photovoltaic power generator, and the control means is executing the surplus power boiling operation. When the surplus power is insufficient, the shortage is compensated by the commercial power supplied from the power system, and the surplus utilization mode is a mode in which the target heat storage amount of the hot water storage tank is made larger than the normal boiling mode, and the control means A weather forecast information receiving means for receiving weather forecast information, a first surplus prediction means for predicting the presence or absence of surplus power without using the weather forecast information, and predicting the presence or absence of surplus power using the weather forecast information Do Second surplus prediction means, setting means for setting a surplus utilization mode at a time when surplus power is predicted to be present, and surplus power when it is predicted that surplus power is present without using the weather forecast information When it is predicted that there is surplus power using the first cancellation means to cancel the surplus utilization mode when the usage time or power consumption of commercial power during boiling operation exceeds the first threshold, and weather forecast information And a second canceling unit that cancels the surplus utilization mode when the usage time or power consumption of the commercial power during the surplus power boiling operation exceeds a second threshold value larger than the first threshold value.

  According to the present invention, surplus power can be utilized more effectively.

1 is a diagram showing a hot water storage hot water supply system according to Embodiment 1. FIG. It is a flowchart which shows the process which the hot water storage type hot-water supply system of Embodiment 1 performs.

  Hereinafter, embodiments will be described with reference to the drawings. In the drawings, common or corresponding elements are denoted by the same reference numerals, and redundant description is simplified or omitted.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a hot water storage type hot water supply system 35 according to the first embodiment. As shown in FIG. 1, the hot water storage hot water supply system 35 of the present embodiment includes an HP unit 7 that uses a heat pump cycle, a tank unit 33 having a hot water storage tank 8, a remote controller 44, and an energy management device 48. . The HP unit 7 is an example of a heating unit that consumes electric power and heats water. In the illustrated configuration, a control unit 36 that controls the operations of the HP unit 7 and the tank unit 33 is built in the tank unit 33.

  The remote controller 44 is connected to the control unit 36 so as to be able to perform data communication in both directions. The remote controller 44 is an example of a user interface. Communication between the control unit 36 and the remote controller 44 may be wired communication or wireless communication. The remote control 44 may be installed in a bathroom. The remote control 44 may be installed in the kitchen. A plurality of remote controllers 44 may be installed in different places. In addition to the remote controller 44, a portable information terminal such as a smartphone may be used as a user interface of the hot water storage type hot water supply system 35.

  The remote controller 44 includes a display unit 44a and an operation unit 44b. The display unit 44a may be a liquid crystal display or an organic EL display, for example. The display unit 44a can display, for example, information related to the state of the hot water storage hot water supply system 35, information related to the setting contents of the hot water storage hot water supply system 35, and the like. The operation unit 44b may include buttons, dials, keys, and the like for the user to operate. The display unit 44a may be a touch screen having the function of the operation unit. The remote controller 44 may further include a speaker, a microphone, and the like. The display unit 44a of the remote controller 44 has a function as a notification unit that notifies information. The remote controller 44 according to the present embodiment includes the display unit 44a as a notification unit, but may include other notification units such as a voice guidance device as a modification.

  The hot water storage type hot water supply system 35 can carry out boiling operation. As will be described later, the boiling operation is an operation in which the water in the hot water storage tank 8 is heated by the HP unit 7. In the present embodiment, a solar power generation device 47 is provided in a house or facility (hereinafter referred to as “house”) where the hot water storage type hot water supply system 35 is used. The hot water storage hot water supply system 35 and other electric devices used in the house can be operated by the electric power generated by the solar power generation device 47. In the following description, the power generated by the solar power generation device 47 is referred to as “solar power generation power”. Moreover, the electric power which can use the hot water storage type hot-water supply system 35 among solar power generation electric power is called "surplus electric power." For example, the portion of solar power generated by excluding the power consumed by other electrical equipment other than the hot water storage hot water supply system 35 may be regarded as “surplus power”. The hot water storage type hot water supply system 35 can perform boiling operation with surplus power. In the following description, the boiling operation using surplus power is referred to as “surplus power boiling operation”.

  A communication adapter 46 is connected to the control unit 36 so as to be capable of data communication in both directions. Communication between the control unit 36 and the communication adapter 46 may be wired communication or wireless communication. The communication adapter 46 and the energy management device 48 are connected so as to be capable of data communication in both directions by wired communication or wireless communication. The energy management device 48 is communicably connected to various devices in the house, including the hot water storage hot water supply system 35 and the solar power generation device 47, and integrates and manages these devices.

  For example, the energy management device 48 periodically receives the generated power information, which is information on the generated power of the solar power generation device 47, the power consumption information of the electrical equipment in the house, and stores it in the memory. Further, the energy management device 48 periodically receives weather forecast information and the like from an external server via a network such as the Internet and stores it in a memory. Based on the information stored in the memory, the energy management device 48 can learn values such as the power generation amount of the solar power generation device 47 in the past, the power consumption amount of the electrical equipment in the house, and the generation time zone thereof. Based on the learned information, weather forecast information, date, day of week information, and the like, the energy management device 48 can predict the time zone in which surplus power is generated on the next day or the current day, and the amount of generation.

  In the following description, the information regarding the generation time zone and generation amount of surplus power on the next day or that day predicted by the energy management device 48 is referred to as “surplus power prediction information”. The control unit 36 can receive surplus power prediction information from the energy management device 48 via the communication adapter 46.

  In the present embodiment, the energy management device 48 corresponds to “weather forecast information receiving means”, “generated power information receiving means”, and “power consumption information receiving means”.

  The HP unit 7 and the tank unit 33 are connected via an HP forward pipe 14, an HP return pipe 15, and an electric wiring (not shown). The operation of various actuators such as valves and pumps provided in the tank unit 33 and the HP unit 7 is controlled by a control unit 36 electrically connected thereto.

  The HP unit 7 connects the compressor 2, the water refrigerant heat exchanger 3, the expansion valve 4, and the air heat exchanger 6 in a ring shape with a refrigerant pipe 5 to constitute a heat pump cycle. The water-refrigerant heat exchanger 3 is for exchanging heat between the refrigerant flowing through the refrigerant pipe 5 and the water guided from the tank unit 33. The heating capacity of the HP unit 7 is the amount of heat given to water per unit time, and the unit is watts. For example, the heating capacity of the HP unit 7 may be adjustable by making the operating frequency of the compressor 2 variable. The power consumption of the HP unit 7 can be adjusted by changing the heating capacity of the HP unit 7.

  The tank unit 33 incorporates the following various components and piping. The hot water storage tank 8 is for storing hot water. Due to the difference in water density depending on the temperature, a temperature stratification can be formed in the hot water storage tank 8 with the upper side being hot and the lower side being low. A third water supply pipe 9 c is connected to a water inlet 8 a provided at the lower part of the hot water storage tank 8. Water supplied from a water source such as water supply is adjusted to a predetermined pressure by the pressure reducing valve 31, and then flows into the hot water storage tank 8 through the third water supply pipe 9c. A hot water supply pipe 21 for supplying hot water stored in the hot water storage tank 8 to the outside of the hot water storage type hot water supply system 35 and a hot water supply pipe 13 are connected to the hot water introduction outlet 8d provided in the upper part of the hot water storage tank 8. Has been. In the boiling operation, the hot water heated using the HP unit 7 flows into the hot water storage tank 8 from the hot water introduction outlet 8d, and the hot water is gradually accumulated in the hot water storage tank 8 from top to bottom. . A plurality of hot water storage temperature sensors 42 and 43 are attached to the surface of the hot water storage tank 8 at different heights. The control unit 36 can detect the hot water storage amount and the heat storage amount in the hot water storage tank 8 by detecting the temperature distribution of the hot water in the hot water storage tank 8 with these hot water storage temperature sensors 42 and 43. The control unit 36 may control the start and stop of the boiling operation according to the detected amount of stored hot water or stored heat in the hot water storage tank 8. In the illustrated example, the two hot water storage temperature sensors 42 and 43 are provided, but more hot water storage temperature sensors may be provided.

  A circulation pump 12 and a bath heat exchanger 20 are built in the tank unit 33. The circulation pump 12 is a pump for circulating hot water through various pipes to be described later in the tank unit 33, and is provided on the HP outgoing pipe 14. The bath heat exchanger 20 is a heat exchanger for heating water to be heated on the secondary side (such as bath water or heating water) using high-temperature hot water supplied from the hot water storage tank 8 or the HP unit 7. is there. In the present embodiment, as a secondary side configuration of the bath heat exchanger 20, a bath outlet pipe 27 and a bath return pipe 28 that circulate hot water in the bathtub 30 will be illustrated and described. The bath heat exchanger 20 is installed in the middle of the bath outlet pipe 27 and the bath return pipe 28. Further, in the middle of the bath outlet pipe 27 and the bath return pipe 28, a bath circulation pump 29 for circulating the bath water, a bath return temperature sensor 38 for detecting the temperature of the bath water discharged from the bathtub 30, A bath-out temperature sensor 37 for detecting the temperature of the hot water after the heat exchange from the bath heat exchanger 20 is installed.

  The three-way valve 11 is a flow path switching means having an a port and a b port through which hot water flows and a c port through which hot water flows out. The four-way valve 18 is a flow path switching means having a b port and a c port through which hot water flows in, and an a port and a d port through which hot water flows out, and has four paths, ab, ac, bd. , Cd can be switched between the channels. The tank unit 33 includes the water outlet port pipe 10, the hot water introduction pipe 20 a, the first bypass pipe 16, the hot water outlet pipe 20 b, and the second bypass pipe 17. The water outlet port 10 connects a water outlet 8 b provided at the lower part of the hot water storage tank 8 and the a port of the three-way valve 11. The HP forward pipe 14 connects the c port of the three-way valve 11 and the inlet side of the HP unit 7. The HP return pipe 15 connects the outlet side of the HP unit 7 and the c port of the four-way valve 18. The hot water supply pipe 13 connects the d port of the four-way valve 18 and the hot water introduction outlet 8 d above the hot water storage tank 8. The first bypass pipe 16 connects the a port of the four-way valve 18 and a hot water inlet 8 c provided between the central part and the lower part of the hot water storage tank 8. The hot water introduction pipe 20 a branches off from the middle of the hot water supply pipe 13 and is connected to the primary inlet of the bath heat exchanger 20. The hot water outlet pipe 20 b connects the primary side outlet of the bath heat exchanger 20 and the b port of the three-way valve 11. The second bypass pipe 17 branches from between the circulation pump 12 in the HP forward pipe 14 and the inlet side of the HP unit 7 and is connected to the b port of the four-way valve 18.

  Further, the tank unit 33 includes a first water supply pipe 9 a, a second water supply pipe 9 b, a hot water supply mixing valve 22, a bath mixing valve 23, a first hot water supply pipe 24, and a second hot water supply pipe 25. One end of the first water supply pipe 9 a is connected to a water source such as a water supply, and the other end of the first water supply pipe 9 a is connected to the second water supply pipe 9 b and the third water supply pipe 9 c via the pressure reducing valve 31. The second water supply pipe 9b is branched from the middle and connected to the hot water supply mixing valve 22 and the bath mixing valve 23, respectively. The hot water supply pipe 21 is branched from the middle and connected to a hot water supply mixing valve 22 and a bath mixing valve 23, respectively. In the middle of the second hot water supply pipe 25, a bath electromagnetic valve 26 for opening and closing the second hot water supply pipe 25 and a bath flow sensor 45 for detecting the flow rate of hot water passing through the second hot water supply pipe 25 are provided. A feed water temperature sensor 49 provided in the first feed water pipe 9a detects a feed water temperature that is a temperature of low-temperature water supplied from a water source.

  The hot water mixing valve 22 and the bath mixing valve 23 adjust the flow rate ratio between the high temperature hot water supplied from the hot water supply pipe 21 and the low temperature water supplied from the second water supply pipe 9b, so that the user can control the remote control 44. The hot water having the set temperature set in step S1 is generated and flows into the first hot water supply pipe 24 and the second hot water supply pipe 25, respectively. The hot water whose temperature has been adjusted by the hot water supply mixing valve 22 is supplied from the first hot water supply pipe 24 to a faucet (not shown) such as a shower and a currant used by the user via the hot water tap 34. On the other hand, the hot water adjusted to the set temperature by the bath mixing valve 23 is supplied from the second hot water supply pipe 25 to the bathtub 30 through the bath flow sensor 45, the bath solenoid valve 26, the bath outlet pipe 27, and the bath return pipe 28. Is done.

  The three-way valve 11 has two flow path forms, a form in which the water outlet pipe 10 and the HP outgoing pipe 14 communicate with each other, and a form in which the hot water outlet pipe 20b and the HP outgoing pipe 14 communicate with each other. Switch the hot water path. The four-way valve 18 is configured such that the HP return pipe 15 and the hot water supply pipe 13 communicate with each other, the HP return pipe 15 and the first bypass pipe 16 communicate with each other, and the first bypass pipe 16 and the second bypass pipe 17 communicate with each other. The flow path of the hot water in the tank unit 33 is switched and used in the four flow path forms, that is, the form in which the hot water supply pipe 13 and the second bypass pipe 17 communicate with each other.

  The hot water storage hot water supply system 35 can execute a boiling operation using electric power (hereinafter referred to as “commercial power”) supplied from an electric power system owned by an electric power company or the like.

  As described above, the energy management device 48 can predict the generation time zone and generation amount of surplus power. When the surplus power is insufficient during the execution of the surplus power boiling operation, the energy management device 48 or the control unit 36 compensates for the shortage with commercial power. In general, commercial power during daytime hours is expensive, so it is desirable not to use commercial power as much as possible during surplus power boiling operation. For this reason, the energy management device 48 predicts that there is surplus power when it can be estimated that the boiling operation can be performed with only surplus power without using commercial power. On the other hand, the energy management device 48 predicts that there is no surplus power when it can be estimated that the boiling operation cannot be performed only by surplus power.

  When surplus power is insufficient during execution of surplus power boiling operation and commercial power is used, the energy management device 48 or the control unit 36 determines at least the usage time of the commercial power and the power consumption of the commercial power. One piece of information is stored in the memory.

  FIG. 2 is a flowchart illustrating processing executed by the hot water storage type hot water supply system 35 according to the first embodiment. In the present embodiment, the energy management device 48 or the control unit 36 will be described as executing the processing of this flowchart. However, as a modification, another device, for example, the remote controller 44 or the communication adapter 46 performs at least part of the processing. A plurality of devices may perform processing in cooperation with each other.

  As step S1 in FIG. 2, the energy management device 48 determines whether the weather forecast information is usable, that is, whether the weather forecast information is receivable from an external server.

  If the weather forecast information is unavailable, the energy management device 48 predicts the presence or absence of surplus power without using the weather forecast information as step S2. In this case, the energy management device 48 predicts the presence or absence of surplus power based on the power generation information of the solar power generation device 47 and the power consumption information of the electrical equipment in the house. Thereby, it is possible to accurately predict the presence or absence of surplus power. The processing in step S2 corresponds to “first surplus prediction means”.

  On the other hand, when the weather forecast information is usable, the energy management device 48 predicts the presence or absence of surplus power using the weather forecast information as step S3. In this case, the energy management device 48 predicts the presence or absence of surplus power based on the weather forecast information, the generated power information of the solar power generation device 47, and the power consumption information of the electrical equipment in the house. Thereby, it is possible to predict the presence or absence of surplus power with higher accuracy. The processing in step S3 corresponds to “second surplus prediction means”.

  The forecast accuracy of surplus power is higher when the weather forecast information is used, but there are cases where the weather forecast information cannot be used due to reasons such as being unable to connect to the Internet or due to a network failure. According to the present embodiment, by providing the first surplus prediction means, the presence or absence of surplus power can be predicted even when the weather forecast information cannot be used.

  As a method for predicting the presence or absence of surplus power without using the weather forecast information, for example, the past and present power generation information of the solar power generation device 47, the past and present power consumption information of the electrical equipment in the house, Based on the above, there is a method for predicting the presence or absence of future surplus power.

  In the case where the presence / absence of surplus power is predicted using the weather forecast information, in addition to the above method, the future power generation of the solar power generation apparatus 47 can be predicted with higher accuracy based on the weather forecast information. For this reason, the presence or absence of surplus power can be predicted with higher accuracy.

  The energy management device 48 may predict that surplus power will be generated immediately after performing the prediction. Alternatively, the energy management device 48 may predict that surplus power is generated in a predetermined period (for example, 10:00 to 14:00 on the next day).

  The energy management device 48 or the control unit 36 has a normal boiling mode and a surplus utilization mode as control modes for the boiling operation. The surplus utilization mode is a mode in which the target heat storage amount of the hot water storage tank 8 is made larger than that in the normal boiling mode. In the normal boiling mode, for example, the amount of hot water converted to a predetermined temperature is set as a target heat storage amount, and the boiling operation is performed so as to ensure the target heat storage amount in the hot water storage tank 8. In the surplus utilization mode, for example, the amount of heat corresponding to 300 L in the amount of hot water converted to the predetermined temperature is set as the target heat storage amount, and the surplus power boiling operation is performed so as to ensure the target heat storage amount in the hot water storage tank 8. When the heat storage amount in the hot water storage tank 8 reaches the target heat storage amount, the energy management device 48 or the control unit 36 ends the boiling operation.

  The process proceeds from step S2 or step S3 to step S4. In step S <b> 4, the energy management device 48 or the control unit 36 determines whether or not the current time is in a time predicted to have surplus power. If the current time does not fall within the time predicted to have surplus power, the energy management device 48 or the control unit 36 sets the normal boiling mode as step S9.

  On the other hand, when the current time is within the time when surplus power is predicted to exist, the energy management device 48 or the control unit 36 sets the surplus utilization mode as step S5.

  Next, as step S6, the energy management device 48 determines whether or not the weather forecast information has been used when surplus power is predicted. When the presence or absence of surplus power is predicted without using the weather forecast information, that is, when the process of step S2 is performed, the energy management device 48 or the control unit 36 raises the surplus power of this time as step S7. It is determined whether or not the usage time of the commercial power during the operation has exceeded the first predetermined time. The first predetermined time may be, for example, 5 minutes. The first predetermined time corresponds to a “first threshold value”.

  If the commercial power usage time during the execution of the surplus power boiling operation this time does not exceed the first predetermined time in step S7, the energy management device 48 or the control unit 36 continues to set the surplus utilization mode as it is. To do. On the other hand, when the usage time of the commercial power during execution of the surplus power boiling operation this time exceeds the first predetermined time, the energy management device 48 or the control unit 36 cancels the setting of the surplus utilization mode. In step S9, the normal boiling mode is set. The processes in steps S7 and S9 correspond to “first release means”.

  On the other hand, when the presence / absence of surplus power is predicted using the weather forecast information, that is, when the process of step S3 is performed, the energy management device 48 or the control unit 36 performs the surplus power of this time as step S8. It is determined whether the usage time of the commercial power during the boiling operation has exceeded the second predetermined time. The second predetermined time may be 60 minutes, for example. The second predetermined time corresponds to a “second threshold value” that is larger than the first threshold value.

  In step S8, when the usage time of the commercial power during execution of the surplus power boiling operation this time does not exceed the second predetermined time, the energy management device 48 or the control unit 36 continues to set the surplus utilization mode as it is. To do. On the other hand, when the usage time of the commercial power during execution of the surplus power boiling operation this time exceeds the second predetermined time, the energy management device 48 or the control unit 36 cancels the setting of the surplus utilization mode. In step S9, the normal boiling mode is set. Steps S8 and S9 correspond to “second release means”.

  As described above, according to the present embodiment, when forecasting the presence or absence of surplus power using weather forecast information, the usage time of commercial power during the execution of surplus power boiling operation, The surplus utilization mode is not canceled until a relatively long second predetermined time is exceeded. Thereby, the following effects are obtained. When weather forecast information is used, the prediction accuracy of surplus power is high. For this reason, even if the surplus power is reduced due to, for example, temporary clouding during the surplus power boiling operation, there is a high possibility that the surplus power will soon recover. Therefore, in such a case, maintaining the surplus utilization mode as much as possible can effectively utilize surplus power when surplus power increases due to subsequent recovery of the weather or the like.

  According to the present embodiment, it is possible to prevent as much as possible from returning from the surplus utilization mode to the normal boiling mode due to a decrease in surplus power due to temporary clouding or the like. For this reason, when surplus power increases / decreases due to unstable weather or the like, it is possible to prevent the surplus utilization mode and the normal boiling mode from being repeated as much as possible. For this reason, while being able to suppress the fall of the heating performance by the loss at the time of the start of boiling operation, etc., it becomes possible to prevent the lifetime of the components (for example, compressor 2) in connection with boiling operation.

  Further, according to the present embodiment, when the presence / absence of surplus power is predicted without using the weather forecast information, the use time of the commercial power during the surplus power boiling operation is relatively short. When the first predetermined time is exceeded, the surplus utilization mode is canceled. Thereby, the following effects are obtained. When weather forecast information is not used, the prediction accuracy of surplus power is not so high. For this reason, if the surplus power is insufficient during the operation of surplus power and commercial power is used, it is unclear whether the surplus power will be recovered immediately, and the surplus power shortage may continue for a long time. There is sex. For this reason, if the surplus power boiling operation is continued, the amount of commercial power purchased increases, which may be uneconomical. On the other hand, in this embodiment, when the presence or absence of surplus power is predicted without using the weather forecast information, the usage time of commercial power during execution of surplus power boiling operation is relatively Since the surplus utilization mode is canceled when the short first predetermined time is exceeded, it is possible to reliably prevent the amount of commercial power purchased from increasing.

  As a modification of the flowchart of FIG. 2, the following may be performed. In step S <b> 7, it is determined whether or not the amount of power used for commercial power during the current surplus power boiling operation has exceeded the first threshold. If the amount of commercial power used during the surplus power boiling operation this time exceeds the first threshold value, the process proceeds from step S7 to step S9 to cancel the setting of the surplus utilization mode and switch to the normal boiling mode. Set. In step S8, it is determined whether or not the amount of power used for the commercial power during the current surplus power boiling operation has exceeded a second threshold value that is greater than the first threshold value. If the amount of commercial power used during the surplus power boiling operation this time exceeds the second threshold value, the process proceeds from step S8 to step S9, the surplus utilization mode setting is canceled, and the normal boiling mode is set. Set. In such a modification, the same effect as described above can be obtained.

  According to the present embodiment, by providing the first surplus prediction means, the presence or absence of surplus power can be predicted even when the weather forecast information cannot be used. For this reason, it is possible to construct the hot water storage type hot water supply system 35 capable of performing the surplus power boiling operation without being connected to the Internet. In this case, the system construction cost can be reduced. In addition, in the hot water storage hot water supply system 35 connected to the Internet, even if the network is broken, the surplus power boiling operation can be performed. Therefore, the surplus power boiling operation can be performed until the network is repaired. There is no such thing as becoming impossible to implement. From these things, according to this Embodiment, it becomes possible to utilize the surplus of the generated electric power of the solar power generation device 47 more effectively, and can suppress the electric power purchase fee from a commercial power supply more reliably. It becomes possible.

  When it is predicted that there is surplus power using the weather forecast information, the energy management device 48 or the control unit 36 sets the second threshold value for the use time or power consumption of commercial power during surplus power boiling operation. Even if it exceeds, it may be comprised so that a user can set not to cancel | release the surplus utilization mode. A user who desires to give priority to the surplus utilization mode can perform the setting by operating the energy management device 48 or the remote controller 44. When this setting is made, the surplus utilization mode is maintained regardless of the commercial power usage time or power consumption during surplus power boiling operation. When it increases, it is possible to reliably use the photovoltaic power generation, and to obtain more effect of suppressing the purchased power charge from the commercial power source.

  The hot water storage type hot water supply system 35 may include a weather forecast information input unit that allows a user to input weather forecast information. For example, the weather forecast information may be input when the user operates the energy management device 48 or the remote controller 44. In this case, the energy management device 48 predicts the presence or absence of surplus power based on the weather forecast information input by the user. By doing as described above, it is not necessary to provide means for receiving weather forecast information from an external server, so that the construction cost of the system can be reduced.

  The hot water storage type hot water supply system 35 may include surplus presence / absence information input means by which a user can input information on the presence / absence of surplus power. For example, the user may input information on the presence / absence of surplus power by operating the energy management device 48 or the remote controller 44. In this case, the energy management device 48 predicts the presence / absence of surplus power based on the information on the presence / absence of surplus power input by the user. By doing so, it is not necessary to provide means for receiving the power generation information of the solar power generation device 47 and the power consumption information of the electrical equipment in the house, so that the system construction cost can be reduced.

  The hot water storage type hot water supply system 35 may include an informing means for informing information on whether or not the surplus utilization mode is set. For example, information on whether or not the surplus utilization mode is set may be notified to the user using the remote controller 44 or the energy management device 48. Thereby, the user can know easily whether the surplus of photovoltaic power generation is used effectively, and usability becomes favorable.

2 compressor, 3 water refrigerant heat exchanger, 4 expansion valve, 5 refrigerant pipe, 6 air heat exchanger, 7 HP unit, 8 hot water storage tank, 9a first water supply pipe, 9b second water supply pipe, 9c third water supply pipe , 10 Water outlet pipe, 11 Three-way valve, 12 Circulation pump, 13 Hot water supply pipe, 14 HP forward pipe, 15 HP return pipe, 18 Four-way valve, 20 Bath heat exchanger, 21 Hot water pipe, 22 Hot water mixing valve , 23 Bath mixing valve, 24 First hot water pipe, 25 Second hot water pipe, 26 Bath solenoid valve, 27 Bath outlet pipe, 28 Bath return pipe, 29 Bath circulation pump, 30 Bathtub, 33 Tank unit, 34 Hot water tap 35 Hot water storage hot water supply system, 36 Control unit, 37 Bath temperature sensor, 38 Bath return temperature sensor, 42, 43 Hot water storage temperature sensor, 44 , 44a display unit, 44b operation unit, 45 flow sensor for bath, 46 communication adapter, 47 solar power generation device, 48 energy management device, 49 water supply temperature sensor

Claims (8)

A hot water storage hot water supply system comprising a hot water storage tank, heating means for consuming electric power and heating water, and control means for controlling a boiling operation for heating water in the hot water storage tank by the heating means,
The surplus power boiling operation that is the above boiling operation using surplus power out of the power generated by the solar power generation device can be executed,
When the surplus power is insufficient during execution of the surplus power boiling operation, the control means compensates the shortage with commercial power supplied from an electric power system,
The surplus utilization mode is a mode for increasing the target heat storage amount of the hot water storage tank more than the normal boiling mode,
The control means includes
Weather forecast information receiving means for receiving weather forecast information;
First surplus prediction means for predicting the presence or absence of the surplus power without using the weather forecast information;
Second surplus prediction means for predicting the presence or absence of the surplus power using the weather forecast information;
Setting means for setting the surplus utilization mode at a time when the surplus power is predicted to exist;
When it is predicted that the surplus power is present without using the weather forecast information, the surplus utilization is performed when the usage time or the power consumption amount of the commercial power during the surplus power boiling operation exceeds a first threshold value. First release means for releasing the mode;
When it is predicted that the surplus power is present using the weather forecast information, a second usage time or a power consumption amount of the commercial power during the surplus power boiling operation is greater than the first threshold. A hot water storage hot water supply system comprising: a second release unit that releases the surplus utilization mode when a threshold value is exceeded. The control means includes
Generated power information receiving means for receiving generated power information which is information of generated power by the solar power generation device;
Power consumption information receiving means for receiving power consumption information of each device using the power generated by the solar power generation device,
The hot water storage hot water supply system according to claim 1, wherein the first surplus prediction means predicts the presence or absence of the surplus power based on the generated power information and the power consumption information. The control means includes
Generated power information receiving means for receiving generated power information which is information of generated power by the solar power generation device;
Power consumption information receiving means for receiving power consumption information of each device using the power generated by the solar power generation device,
The hot water storage hot water supply system according to claim 1 or 2, wherein the second surplus prediction means predicts the presence or absence of the surplus power based on the weather forecast information, the generated power information, and the power consumption information. . Surplus presence / absence information input means that allows a user to input information on the presence or absence of surplus power,
The hot water storage hot water supply according to any one of claims 1 to 3, wherein the first surplus prediction means predicts the presence or absence of the surplus power based on information input to the surplus presence / absence information input means. system.   The hot water storage hot water supply system according to any one of claims 1 to 4, wherein the weather forecast information receiving means is capable of receiving the weather forecast information from an external server. Comprising weather forecast information input means by which a user can input the weather forecast information;
6. The second surplus prediction unit according to claim 1, wherein the second surplus prediction unit predicts the presence / absence of the surplus power based on the weather forecast information input to the weather forecast information input unit. Hot water storage hot water system.   When the surplus power is predicted to be present using the weather forecast information, the control means uses the commercial power during the surplus power boiling operation or the amount of power used satisfies the second threshold. The hot water storage hot water supply system according to any one of claims 1 to 6, wherein it is possible to set so as not to cancel the surplus utilization mode even if the excess is exceeded.   The hot water storage type hot water supply system according to any one of claims 1 to 7, further comprising an informing unit that informs whether or not the surplus utilization mode is set.

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