JP2007101153A - Hot water system - Google Patents

Abstract

Provided is a hot water system using a storage battery as a heater power source capable of generating hot water with high energy efficiency while reducing the size of the hot water storage tank. The hot water system 10 including the heater 22 that heats the hot water stored in the battery and the storage battery 34 that serves as a power source for the heater 22 supplies the heater 22 with the electric power output from the storage battery 34 as DC power, thereby the heater 22. There is provided a heating control unit 36 for heating the hot and cold water.
[Selection] Figure 1

Description

  The present invention relates to a hot water system including a hot water storage tank for storing hot water generated by heating supplied water, and a heater provided in the hot water storage tank.

  Conventionally, as a hot water supply system, there is one using an electric water heater that heats hot water using midnight power. In such a hot water supply system, a large-capacity hot water storage tank is required to store hot water generated by midnight power. For this reason, there has been a problem that it is difficult to install in a private house or the like having a problem with the installation space of the hot water tank. In addition, there is a hot water supply system that stores hot water heated by midnight power in a large-capacity hot water storage tank and supplies this hot water to each dwelling unit of the apartment house. However, in such a hot water supply system, since the piping from the hot water storage tank to each dwelling unit becomes long, there is a problem that it takes a long time until hot water comes out after the hot water supply port is opened. Due to these problems, hot water supply systems using midnight power are not so popular for private houses and collective housing where installation space is problematic.

On the other hand, Patent Document 1 discloses a hot water device in which a storage battery is charged with electric power of a solar battery panel, and hot water in a hot water tank is heated by an electric water heater with the electric power of the storage battery.
JP 2000-55479 A

  However, in the hot water device described in Patent Document 1, the electric power of the storage battery is supplied to the electric water heater via the DC / AC inverter. For this reason, loss generation in the DC / AC inverter is inevitable, hot water cannot be efficiently generated, and the problem of lengthening the installation space and piping cannot be dealt with.

  The present invention has been made in view of the above points, and provides a hot water system using a storage battery as a power source of a heater capable of generating hot water with high energy efficiency while reducing the size of a hot water storage tank. For the purpose.

  In order to achieve the above object, the present invention is a hot water system comprising a hot water storage tank for storing hot water generated by heating supplied water, and a heater provided in the hot water storage tank, the power source of the heater And a heating control unit that heats hot water in the hot water storage tank by the heater by supplying electric power output from the storage battery to the heater as DC power.

  According to the present invention, since the hot water in the hot water storage tank can be heated by the heater using the storage battery as a power source, it is not necessary to store a large amount of hot water in the hot water storage tank, and the capacity of the hot water storage tank can be reduced. Moreover, since the electric power of a storage battery is supplied to a heater with direct-current power, there is no loss accompanying use of an inverter, and hot water can be heated efficiently. However, in consideration of economy and the like, if necessary, an inverter can be connected to the storage battery, and the output of the inverter can be used as an emergency indoor power source at the time of a power failure of the commercial power source.

  Moreover, in this invention, it is good also as providing the charging part which charges the said storage battery using midnight commercial power. Since late-night commercial power is low-cost, the electricity cost required for charging the storage battery can be reduced in this way.

  Moreover, in this invention, it is good also as providing the heat recovery part which collect | recovers the heat which the said storage battery discharge | released to the water supplied to the said hot water storage tank. If it does in this way, since the water by which the heat | fever of the storage battery was collect | recovered will be heated in a hot water storage tank, warm water can be produced | generated more efficiently.

  In the present invention, the heating control unit may have a function of heating hot water in the hot water storage tank by the heater using midnight commercial power as a power source.

  The hot water system of the present invention further includes a water temperature detection unit that detects a water temperature in the hot water storage tank, and the heating control unit uses the storage battery as a power source when the detected water temperature is equal to or lower than a predetermined temperature. It is good also as having the function to heat the hot water in the said hot water storage tank.

Further, the hot water system of the present invention includes a water temperature detection unit that detects the water temperature in the hot water storage tank,
A remaining capacity detection unit that detects a remaining capacity of the storage battery, wherein the heating control unit is configured such that the detected remaining capacity is a predetermined amount or less and the detected water temperature is a predetermined temperature or less. The hot water in the hot water storage tank may be heated by the heater using commercial power as a power source.

  In the present invention, the heater may include a first heater that uses the storage battery as a main power source and a second heater that uses commercial power as a main power source. If it does in this way, the said heating control part can be made to heat the hot water in the said hot water storage tank by the said 2nd heater by using midnight commercial power as a power supply. Further, when the water temperature in the hot water storage tank is lower than a predetermined temperature, the hot water in the hot water storage tank is heated by the first heater, or the remaining capacity of the storage battery is lower than a predetermined amount, and When the water temperature in the hot water storage tank is lower than a predetermined temperature, the hot water in the hot water storage tank can be heated by the second heater. Moreover, the said heating control part is good also as having a function which heats the hot water in the said hot water storage tank by both the said 1st heater and the said 2nd heater.

  In the present invention, the storage battery may be a laminate type lithium ion storage battery.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water system which used the storage battery as a power supply of a heater which can produce | generate hot water with high energy efficiency, aiming at size reduction of a hot water storage tank can be provided.

  FIG. 1 is an overall configuration diagram of a hot water system 10 according to an embodiment of the present invention. As shown in the figure, the hot water system 10 of the present embodiment includes a hot water storage tank 20 and a heater 22 installed therein. The hot water storage tank 20 stores hot water generated by heating the water supplied from the water supply pipe 24 with the heater 22. Hot water stored in the hot water storage tank 20 is guided to a hot water outlet such as the shower 28 and the currant 30 through the hot water supply pipe 26 after adjusting the temperature by the mixing plug 31.

  The water supply pipe 24 is provided with a heat recovery unit 32. A storage battery 34 serving as a main power source of the heater 22 is accommodated in the heat recovery unit 32. The storage battery 34 is accommodated in a watertight case, and, for example, a bellows-shaped or plate-shaped water conduit is disposed so as to contact the case. Thereby, the heat generated during charging / discharging of the storage battery 34 is recovered in the water supplied to the hot water storage tank 20. As the storage battery, a secondary battery such as a lead storage battery, a silver / zinc storage battery, a lithium / ion storage battery, a nickel / metal hydroxide storage battery, a NaS battery, a nickel / zinc storage battery, a lithium metal storage battery, or a capacitor can be used. However, a lithium ion storage battery is particularly preferable as a power source for the heater 22 because of its large capacity, high output, and high efficiency. Laminate type lithium ion storage batteries are housed in a case with good water resistance, but after taking necessary protective measures in case of external damage etc., directly or indirectly into the water. By making it bath, heat can be recovered more efficiently, and the installation space can be reduced because of the small size.

  The hot water system 10 also includes a control unit 36. A water temperature sensor 38 that detects the temperature of the hot water stored in the hot water storage tank 20 is connected to the control unit 36. As will be described below, the control unit 36 has a function of controlling energization of the heater 22 and charging of the storage battery 34 based on the water temperature detected by the water temperature sensor 38 and the remaining capacity of the storage battery 34.

  An inverter may be connected to the storage battery 34 so that the output of the inverter can be used as an emergency indoor power source at the time of a power failure of the commercial power source.

  FIG. 2 is a conceptual diagram of a circuit showing a detailed configuration of the control unit 36. As shown in the figure, the control unit 36 includes a timer 50, a rectifier 52, a charge / discharge control circuit 54, a heating control unit 56, switches S1 to S4, and the like. The storage battery 34 is provided with a remaining capacity detector 58. The heater 22 includes a first heater R and a second heater r. As will be described later, the first heater R is a heater for replenishing hot water in the hot water storage tank 20 using the storage battery 34 as a main power source, and the second heater r stores hot water at night using midnight commercial power as the main power source. It is a heater for heating hot water in a tank to store a required amount of hot water.

  The timer 50, the rectifier 52, and the charge / discharge control circuit 54 are connected in series between the commercial power source 42 and the positive electrode of the storage battery 34. In addition, a first heater R and a switch S3 are connected in series between the connection between the rectifier 52 and the charge / discharge control circuit 54 and the negative electrode of the storage battery 34. The first heater R and the second heater r are connected in parallel to the commercial power source 42. A switch S2 is provided between the commercial power source 42 and the second heater r, and the second heater r and the first heater r are connected to the first heater R and the second heater r. Switches S4 are provided between the heaters R, respectively. Further, a switch S1 is provided between the connection portion between the timer 50 and the rectifier 52 and the second heater r.

  The timer 50 is set to be turned on only in the late-night time zone (for example, from 11:00 to 8:00 in the morning) to which the late-night electricity charge is applied. Accordingly, during the midnight time period, the power of the commercial power source 42 is charged to the storage battery 34 via the timer 50, the rectifier 52 and the charge / discharge control circuit 54. In other words, the storage battery 34 is charged by inexpensive late-night commercial power.

  Further, as shown below, the first heater R and the second heater r are energized in each operation mode according to the on / off states of the switches S1 to S4, and the hot water in the hot water storage tank 20 is heated.

(1) Operation mode 1 (S1: ON; S2, S3, S4: OFF)
In this operation mode 1, the second heater r is connected to the commercial power source 42 via the timer 50. Therefore, the second heater r is energized in the midnight time zone when the timer 50 is turned on, and the hot water in the hot water storage tank 20 is heated by the second heater r using midnight commercial power as a power source. That is, the operation mode 1 is an operation mode for boiling hot water with inexpensive late-night commercial power at night to secure necessary hot water in the daytime.

(2) Operation mode 2 (S2: ON; S1, S3, S4: OFF)
In this operation mode 2, the second heater r is directly connected to the commercial power source 42. Therefore, the hot water in the hot water storage tank 20 is heated by the second heater r using commercial power as a power source regardless of day or night. In the present embodiment, the heating control unit 56 turns on the switch S2 when the water temperature in the hot water storage tank 20 falls below a predetermined temperature and the remaining capacity of the storage battery 34 becomes below a predetermined amount, and the operation mode 2 And That is, in the operation mode 2, when the hot water in the hot water storage tank 20 is consumed in a larger amount than usual and the power capacity of the storage battery 34 is insufficient, the hot water in the hot water storage tank 20 is supplied with commercial power as a power source regardless of day or night. It is an operation mode to cook up.

(3) Operation mode 3 (S3: ON; S1, S2, S4: OFF)
In this operation mode 3, the first heater R is connected to the storage battery 34, and the hot water in the hot water storage tank 20 is heated by the first heater R using the electric power of the storage battery 34. In the present embodiment, when the water temperature of the hot water storage tank 20 falls below a predetermined temperature, the heating control unit 56 turns on the switch S3 to set the operation mode 3. That is, the operation mode 3 is an operation mode in which additional cooking is performed when the water temperature decreases as the hot water is consumed during normal hot water use.

(4) Operation mode 4 <S3, S4: ON; S1, S2: OFF>
In this operation mode 4, the hot water in the hot water storage tank 20 is heated by both the first heater R and the second heater r by connecting the first heater R and the second heater r in parallel to the storage battery 34. . Thus, the operation mode 4 is an operation mode in which the hot water in the hot water storage tank 20 can be rapidly heated by the two heaters r and R using the storage battery 34 as a power source.

(5) Operation mode 5 <S2, S3: ON; S1, S4: OFF>
In this operation mode 5, the first heater R is connected to the storage battery 34, and the second heater r is connected to the commercial power source 42, so that both the first heater R and the second heater r are used in the hot water storage tank 20. Hot water is heated. As described above, the operation mode 4 is an operation mode in which the hot water in the hot water storage tank 20 can be rapidly heated by the two heaters r and R by using the electric power of the storage battery 34 and the commercial power source 42 together.

(6) Operation mode 6 <S2, S4: ON; S1, S3: OFF>
In this operation mode 6, the hot water in the hot water storage tank 20 is heated by both the first heater R and the second heater r by connecting the first heater R and the second heater r in parallel to the commercial power source 42. The Thus, the operation mode 4 is an operation mode in which the hot water in the hot water storage tank 20 can be rapidly heated by the two heaters r and R using commercial power as a power source.

  As described above, according to the configuration of the control unit 36 shown in FIG. 2, the storage battery 34 can be charged with inexpensive late-night power. In operation mode 1, hot water can be stored in hot water storage tank 20 at night using inexpensive late-night power as a power source, and when using normal hot water, reheating can be performed using storage battery 34 as a power source in operation mode 3. . Furthermore, for example, when the amount of hot water used is greatly increased than usual when a large number of visitors are present, the required amount of hot water can be heated using commercial power as a power source in the operation mode 2, and the operation mode In 4-6, warm water can be heated more rapidly.

  As described above, the operation modes 2 and 3 are realized by the heating control unit 56 setting the on / off states of the switches S1 to S4 based on the detection results of the water temperature sensor 38 and the remaining capacity detection unit 58. In addition, for the operation mode 1 and the operation modes 4 to 6, for example, an operation switch for selecting a night hot water storage operation and a rapid heating operation is provided, and the heating control unit 56 responds to the selection by the operation switch. This can be realized by setting the on / off states of the switches S1 to S4. When the rapid heating operation is selected, if the remaining capacity of the storage battery 34 is sufficiently large, the operation mode 4 is used in which only the storage battery 34 is heated as a power source. If the remaining capacity of the storage battery 34 is medium, the storage battery 34 and the commercial power supply are used. If the remaining capacity of the storage battery 34 is small, the operation mode 4 to 6 may be selected according to the remaining capacity, such as operation in the operation mode 6 using only the commercial power source.

  FIG. 3 shows a configuration example in which the heat recovery part 32 is installed in a space part 102 such as under the floor in a building room and the hot water storage tank 20 is attached to the indoor wall part 100 in the present embodiment. In the example shown in the figure, the cooling box 32A constituting the heat recovery unit 32 is installed in the under-floor space below the floor 102, and the storage battery 34, which is a laminated lithium ion battery, is accommodated in the cooling box 32A. The collection unit 32 is used. Moreover, the hot water storage tank 20 is attached to the wall surface of the wall part 100, for example as a wall-hanging type. Then, water is supplied from the water supply pipe 24 to the cooling box 32A, and hot water heated by the heat of the storage battery 34 in the cooling box 32A is supplied to the hot water storage tank 20. The floor 100 is provided with a lid 101 that can be easily removed, and the lid 101 is opened so that the heat recovery unit 32 and the storage battery 34 can be maintained. As shown in FIG. 4, the heat recovery part 32 may be provided inside the wall part 100.

  In the present embodiment, the hot water in the hot water storage tank 20 is cooked by using the storage battery 34 as a main power source at normal times. However, since a large capacity and high output battery such as a lithium ion storage battery can be used as the storage battery 34, a large amount of hot water is used. It can be heated quickly. For this reason, it is not necessary to store a large amount of hot water in the hot water storage tank 20, and the capacity of the hot water storage tank 20 can be reduced. As a result, for example, as shown in FIG. 3 above, the hot water storage tank 20 can be attached to the wall surface or can be easily attached to one corner of the veranda or under the veranda on the upper floor. As described above, even when the installation space is limited, the hot water storage type hot water system can be widely spread. Also, in the housing complex and the like, by installing the hot water storage tank 20 in each dwelling unit, the piping from the hot water storage tank 20 to the hot water outlet can be shortened, so it takes time from the opening of the hot water outlet until hot water comes out. It is possible to solve the problem of the cost. In addition, the laminate type lithium ion storage battery can save space, and by using this as the storage battery 34, for example, as shown in FIG. 3, the storage battery 34 can be installed under the floor or inside the wall. The freedom of space is also increased.

  Moreover, the temperature of the water supplied to the hot water storage tank 20 becomes high by recovering the heat released when the storage battery 34 is charged and discharged into the water supplied to the hot water storage tank 20. For this reason, the time required for heating the hot water in the hot water storage tank 20 to a predetermined temperature can be shortened, and the amount of electrical energy required for heating can be suppressed by recovering the heat loss. Hot water can be heated.

  In addition, since the storage battery 34 can be charged using inexpensive late-night commercial power, the running cost can be reduced.

  Furthermore, when commercial power is used as the main power source for additional cooking, the power consumption of the heater increases in order to heat hot water rapidly, so the contract power with the power company must be increased, However, in this embodiment, since the storage battery 34 is used as the main power source for additional cooking as described above, it is not necessary to increase the contract power with the power company. Can be prevented from becoming high. In addition, by selecting the hot water storage capacity and power storage capacity in an optimal pattern that matches the hot water usage pattern, it is no longer necessary to secure more hot water storage than necessary. A few systems can be constructed.

  In the above embodiment, the heater 22 is configured by the first heater R having the storage battery 34 as the main power source and the second heater r having the commercial power source 42 as the main power source, but the present invention is not limited thereto. Instead, both heating using the storage battery 34 as a power source and heating using the commercial power source 42 as a power source may be performed by one heater 22. However, as in the above-described embodiment, the heater 22 is divided into the first heater R and the second heater r, and the capacity of the first heater R can be sufficiently cooked using the storage battery 34 as a power source even in winter. On the other hand, it is preferable to design the second heater r so that hot water can be efficiently heated at night using commercial power as a power source.

1 is an overall configuration diagram of a hot water system according to an embodiment of the present invention. It is a circuit diagram which shows the detailed structure of the control part with which the hot water system of this embodiment is provided. In this embodiment, it is a figure which shows the structural example which provided the heat-recovery part under the floor in a building room, and attached the hot water storage tank to the wall surface. It is a figure which shows the structural example which provided the heat recovery part in walls, such as a partition wall in a building room, and attached the hot water storage tank to the wall surface in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hot water system 20 Hot water storage tank 22 Heater 24 Water supply pipe 26 Hot water supply pipe 32 Heat recovery part 34 Storage battery 36 Control part 38 Water temperature sensor 50 Timer 52 Rectifier 54 Charge / discharge control circuit 56 Heating control part 58 Remaining capacity detection part R 1st heater r 1st 2 heaters

Claims (13)

A hot water system comprising a hot water storage tank for storing hot water generated by heating supplied water, and a heater provided in the hot water storage tank,
A storage battery as a power source of the heater;
A hot water system comprising: a heating control unit that heats hot water in the hot water storage tank by the heater by supplying electric power output from the storage battery to the heater as DC power.   The hot water system according to claim 1, further comprising a charging unit that charges the storage battery using midnight commercial power.   3. The hot water system according to claim 1, further comprising: a heat recovery unit that recovers heat released from the storage battery into water supplied to the hot water storage tank. 4. The hot water system according to any one of claims 1 to 3,
The heating control unit has a function of heating hot water in the hot water storage tank by the heater using midnight commercial power as a power source. In the hot water system according to any one of claims 1 to 4,
A water temperature detection unit for detecting the water temperature in the hot water storage tank;
The heating control unit has a function of heating hot water in the hot water storage tank with the heater using the storage battery as a power source when the detected water temperature is equal to or lower than a predetermined temperature. In the hot water system according to any one of claims 1 to 4,
A water temperature detector for detecting the water temperature in the hot water storage tank;
A remaining capacity detection unit for detecting the remaining capacity of the storage battery,
The heating control unit heats hot water in the hot water storage tank by the heater using commercial power as a power source when the detected remaining capacity is a predetermined amount or less and the detected water temperature is a predetermined temperature or less. A hot water system characterized by having a function of The hot water system according to any one of claims 1 to 3,
The heater includes a first heater that uses the storage battery as a main power source and a second heater that uses commercial power as a main power source. The hot water system according to claim 7,
The heating control unit has a function of heating hot water in the hot water storage tank by the second heater using midnight commercial power as a power source. The hot water system according to claim 7 or 8,
A water temperature detection unit for detecting the water temperature in the hot water storage tank;
The said heating control part has a function which heats the hot water in the said hot water storage tank by the said 1st heater by using the said storage battery as a power supply, when the detected water temperature is below predetermined temperature. The hot water system according to claim 7 or 8,
A water temperature detector for detecting the water temperature in the hot water storage tank;
A remaining capacity detection unit for detecting the remaining capacity of the storage battery,
When the detected remaining capacity is a predetermined amount or less and the detected water temperature is a predetermined temperature or less, the heating control unit uses commercial power as a power source in the hot water storage tank by the second heater. A hot water system having a function of heating hot water. The hot water system according to any one of claims 7 to 10,
The heating control unit has a function of heating hot water in the hot water storage tank by both the first heater and the second heater. The hot water system according to any one of claims 1 to 11,
The hot water system, wherein the storage battery is a laminate type lithium ion storage battery. The hot water system according to any one of claims 1 to 12, wherein an inverter connected to the storage battery is provided, and the output of the inverter can be used as an emergency indoor power source when a commercial power supply fails. A hot water system characterized by

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