JP4302677B2 - Hot water supply pipe reheating system, hot water supply system, and hot water supply method - Google Patents

Description

  The present invention relates to a hot water supply pipe reheating system for reheating hot water flowing through a hot water supply pipe from a hot water storage tank to a hot water supply port, and a hot water supply system and method for performing such reheating.

  Conventionally, for example, as a hot water supply system for home use, a hot water supply system in which hot water heated by a heater is stored in a hot water storage tank and the hot water is supplied to a hot water outlet such as a shower or a caran through a hot water supply pipe is used. It is common. In such a conventional hot water supply system, when hot water in the hot water supply pipe is not used, it is left to be cooled by the outside air while being kept warm by a heat insulating material or the like, or hot water in the hot water supply pipe is forcibly circulated. Let's keep the hot water temperature.

For example, in the hot water device described in Patent Document 1, a storage battery is charged with electric power of a solar battery, hot water of a hot water storage tank is heated with electric power of the storage battery, and hot water of the heated hot water storage tank is supplied with hot water via a hot water supply pipe. Yes. Moreover, although the method of forcibly circulating hot water in hot water supply piping and maintaining hot water temperature is frequently used, among these, in the apparatus described in Patent Document 2, not only hot water is circulated in hot water supply piping. The system has a heat exchange mechanism that exchanges heat between the hot water in the hot water storage tank and the hot water in the circulating hot water pipe. It proposes a reduction in equipment costs and running costs by omitting electrical failures by omitting sensors.
JP 2000-55479 A JP 2004-333063 A

  As described above, in the conventional hot water supply system that supplies hot water stored in the hot water storage tank, while hot water is not being supplied, the hot water staying in the hot water supply pipe cools, opens the hot water supply port, and starts hot water supply. Cold water often comes out for a while. And for the convenience of space, the hot water storage tank is often installed in a place away from a hot water supply place such as a bathroom, and the hot water supply pipe becomes long. Become more. For this reason, the user must wait for a long time until the hot water comes out, which is unpleasant, and there is a problem that the water until the hot water is thrown away is wasted. Moreover, in the system which circulates hot water in the hot water supply pipe, there are problems that the thermal efficiency is lowered and the equipment cost is increased.

  The present invention has been made to solve the above problems, and when hot water stored in a hot water storage tank is supplied from a hot water supply port via a hot water supply pipe, hot water supply is started without causing a decrease in thermal efficiency or an increase in equipment costs. The purpose is to enable hot water to be supplied immediately after the hot water.

In order to achieve the above object, the present invention is a hot water supply pipe reheating system for reheating hot water supplied from a hot water storage tank to a hot water supply port via a hot water supply pipe,
Provided in the vicinity of the hot water supply port in the hot water supply pipe, the heating means for heating by being energized, and a reheat section to reheat the hot water flowing through the hot water supply pipe,
The reheating unit
A cylindrical housing provided with an inlet part through which the hot water supply pipe flows in and an outlet part through which hot water flows out;
A cylindrical support provided in the housing and having a spiral groove formed on the outer peripheral surface;
A heating wire as the heating means wound around the spiral groove,
The hot water flowing in from the inlet portion flows through the space between the spiral groove and the inner peripheral surface of the housing, and flows out from the outlet portion .

  According to the present invention, since hot water flowing through the hot water supply pipe is reheated at a position near the hot water supply port, hot hot water can be supplied immediately after the start of hot water supply.

Further, in the hot water supply pipe reheating system of the present invention, the hot water is reheated by the heating means only when there is a predetermined amount of water flow in the hot water supply pipe and the water temperature in the hot water supply pipe is equal to or lower than a predetermined temperature. It is good also as providing the heating control means to be made. In this way, when the water temperature in the hot water supply pipe is sufficiently high or when hot water is not being supplied , it is possible to prevent unnecessary reheating and to prevent the hot water from being heated excessively. Can be prevented.

  In the hot water supply pipe reheating system of the present invention, a storage battery may be provided as a power source for the heating means. In this case, when there is a predetermined amount of water flow in the hot water supply pipe and the water temperature in the hot water supply pipe is equal to or lower than the predetermined temperature, the storage battery is energized to reach the predetermined upper limit temperature. Then, it is good also as providing the heating control means which stops electricity supply.

  Further, the heating control means includes a water flow detection means for detecting the amount of water flow in the hot water supply pipe or the presence or absence of a water flow exceeding a predetermined amount, a water temperature detection means for detecting the water temperature in the hot water supply pipe, and the water flow detection means. A water flow relay that closes when a water flow of a predetermined amount or more is detected, and a temperature that closes when the water temperature detected by the water temperature detecting means is equal to or lower than a predetermined lower limit temperature, and opens when the predetermined upper limit temperature is reached. And the water flow relay and the temperature relay may be connected in series between the storage battery and the heating means.

Alternatively, the heating control means
Water flow detection means for detecting the amount of water flow in the hot water supply pipe or the presence or absence of a water flow of a predetermined amount or more;
Water temperature detecting means for detecting the water temperature in the hot water supply pipe, and there is a water flow of a predetermined amount or more in the hot water supply pipe based on detection information by the water flow detection means and detection information by the water temperature detection means. And when the water temperature in the hot water supply pipe is below a predetermined lower limit temperature, the heating means is energized, and when the water flow is less than a predetermined amount or the water temperature is higher than a predetermined upper limit temperature, the energization is stopped. Such electronic control may be performed.

  Moreover, the hot water supply pipe reheating system of the present invention may include charging means for charging the storage battery with a commercial power source. This charging means preferably has a charge control / battery protection function for appropriately charging the storage battery.

  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 may be used. In particular, lithium ion storage batteries are preferable as a power source for the heating means because they have a large capacity, high output, and high efficiency.

In addition, the hot water supply system according to the present invention is:
A hot water storage tank for storing hot water;
A hot water supply pipe for guiding the hot water stored in the hot water storage tank to the hot water outlet;
A reheating unit that is provided at a position near the hot water supply port in the hot water supply pipe and reheats the hot water flowing through the hot water supply pipe by heating means that generates heat when energized ;
With
The reheating unit
A cylindrical housing provided with an inlet part through which the hot water supply pipe flows in and an outlet part through which hot water flows out;
A cylindrical support provided in the housing and having a spiral groove formed on the outer peripheral surface;
A heating wire as the heating means wound around the spiral groove,
The hot water flowing in from the inlet portion flows through the space between the spiral groove and the inner peripheral surface of the housing, and flows out from the outlet portion .

Further, the present invention is a hot water supply method for supplying hot water stored in a hot water storage tank from a hot water supply port via a hot water supply pipe,
In the vicinity of the hot water outlet in the hot water piping,
The hot water supply pipe is provided with a cylindrical housing having an inlet portion through which hot water flows and an outlet portion through which hot water flows out, and a cylindrical housing provided in the housing and having a spiral groove formed on an outer peripheral surface thereof. And a heating wire wound around the spiral groove and heated by using a storage battery as a main power source, and the hot water flowing from the inlet portion is connected to the spiral groove and the inner periphery of the casing. A reheating part configured to flow through the space between the surfaces and out of the outlet part,
When there is a predetermined amount or more of water flow in the hot water supply pipe and the water temperature in the hot water supply pipe is equal to or lower than a predetermined lower limit temperature, the reheating unit reheats the hot water flowing through the hot water supply pipe, Heating is stopped when the upper limit temperature is reached.

  According to the present invention, when hot water stored in a hot water storage tank is supplied from a hot water supply port, hot hot water can be supplied immediately after the start of hot water supply. Moreover, since the circulation of hot water, which has conventionally been performed to supplement the cooling of hot water in the hot water supply pipe, is no longer necessary, a decrease in thermal efficiency and a rise in equipment can be suppressed.

FIG. 1 is an overall configuration diagram of a hot water supply system 10 which is a first reference example of the present invention. As shown in the figure, a hot water supply system 10 of this reference example includes a hot water storage tank 20, a hot water supply pipe 28 that guides hot water stored in the hot water storage tank 20 to a hot water supply port 26 such as a shower 22 and a currant 24, and a hot water supply pipe. 28 is provided at a position near the hot water supply port 26 and includes a reheating unit 30 for reheating hot water flowing through the hot water supply pipe 28.

  The hot water storage tank 20 heats the cold water supplied from the water supply pipe 21 with, for example, a water heater (not shown) that is an electric heater and stores the heated hot water. Further, the hot water supply port 26 is provided with a mixing faucet (not shown) for mixing cold water with hot water supplied from the hot water supply pipe 28, and the user operates the mixing faucet to operate the hot water supply temperature. Can be adjusted.

  The reheating unit 30 includes heating means 31 that is a heater that generates heat when energized. Electric power is supplied to the heating means 31 from the heating control unit 35. The heating control unit 35 includes a storage battery 32, and a temperature relay 34 and a water flow relay 36 connected in series between the storage battery 32 and the heating unit 31. As will be described later, the temperature relay 34 closes when the temperature of the hot water flowing through the hot water supply pipe 28 becomes equal to or lower than a predetermined lower limit temperature, and opens when the temperature reaches a predetermined upper limit temperature. The water flow relay 36 is closed when a predetermined amount or more of water flow exists in the hot water supply pipe 28 (that is, when hot water is supplied from the hot water supply port 26).

  FIG. 2 is an enlarged longitudinal sectional view showing the reheating unit 30 and the vicinity thereof. As shown in the figure, the reheating unit 30 includes a reheating pipe 38 connected in the middle of the hot water supply pipe 28. The reheating tube 38 includes a diameter-expanded portion 38a at the center in the length direction, and the heating means 31 is accommodated in the diameter-expanded portion 38a. The heating means 31 is formed in a coil shape as shown in FIG. 2, for example, and is constituted by a heating wire having a property of generating heat and radiating heat immediately when energized.

  An opening 39 for performing attachment and maintenance of the heating means 31 is provided in the enlarged diameter portion 38a of the reheating tube 38, and the upper lid 41 is connected with a bolt 42 via a packing 40 so as to close the opening 39. It is attached.

  Further, a threaded portion is provided on the inner peripheral surface of the upstream end portion (left side in the drawing) of the reheating pipe 38, and this threaded portion is provided on the outer peripheral surface of the downstream end portion of the upstream hot water supply pipe 28a. The reheat pipe 38 is connected to the hot water supply pipe 28a by being screwed into the threaded portion. On the other hand, at the downstream end of the reheating pipe 38, a hot water supply pipe 28 b reaching the hot water supply port 26 through the water flow sensor 50 is provided with flanges at both ends of the water flow sensor 50, the reheating pipe 38 and the hot water supply pipe. The flange portion at the end of 28b is brought into contact with each other by bolting, and a temperature sensor 52 is disposed in the vicinity of the water flow sensor 50.

  The water flow sensor 50 detects the amount of water flowing through the hot water supply pipe 28 or the presence or absence of a water flow exceeding a predetermined amount, and closes the water flow relay 36 (FIG. 1) when a water flow exceeding a predetermined amount is detected. Further, the temperature sensor 52 detects the water temperature in the hot water supply pipe 28, and closes the temperature relay 34 (FIG. 1) when the detected water temperature is equal to or lower than a predetermined lower limit temperature (for example, 60 ° C.). Temperature relay 34 is opened. The water flow relay and the temperature relay can be used by appropriately increasing the number of contacts according to the required power capacity, or by increasing the contact capacity, and by taking in the information of each sensor, Control similar to this can be performed by an electronic control circuit. In other words, based on the detection information of the water flow sensor 50 and the detection information of the temperature sensor 52, when there is a water flow of a predetermined amount or more in the hot water supply pipe 28 and the temperature of the hot water is not more than a predetermined lower limit temperature, the heating means An electronic control circuit is provided that conducts electronic control to stop the energization when the current is less than a predetermined amount or the water temperature is equal to or higher than a predetermined upper limit temperature.

  Examples of the storage battery 32 serving as a power source for the heating means 31 include 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, and a large capacity A secondary battery such as an output capacitor can be used. In particular, a lithium ion storage battery is preferable as a power source for the heating means 31 because of its large capacity, high output, and high efficiency.

As shown in FIG. 1, the hot water supply system of this reference example includes a charging circuit 60 that charges the storage battery 32. As shown in the figure, the charging circuit 60 basically includes a commercial power source 62 and a diode 66. However, according to the kind of secondary storage battery to be used, it comprises so that the optimal charging / discharging form which considered the cost can be taken. For example, when using a lithium-ion battery as a secondary storage battery, use a charging method such as constant current charging or constant voltage charging, and use an overcharge protection device or a device that can manage each cell unit if necessary. Append. In addition, an overdischarge prevention device is added in consideration of the battery life.

  According to the above configuration, the temperature of the hot water in the hot water supply pipe 28 is equal to or lower than a predetermined lower limit temperature (for example, 60 ° C.), and there is a predetermined amount of water flow in the hot water supply pipe 28 (that is, hot water supply from the hot water supply port 26). When the heating means 31 is energized from the storage battery 32 via the temperature relay 34 and the water flow relay 36, the heating means 31 generates heat, and the hot water flowing through the hot water supply pipe 28 is regenerated by the reheating pipe 38. Heated. Therefore, even if the hot water supplied from the hot water storage tank 20 stays in the hot water supply pipe 28 and cools to a predetermined temperature or lower, the hot water is reheated by the heating means 31 and then supplied from the hot water supply port 26. Will be. For this reason, since hot hot water is supplied immediately after the hot water supply port 26 such as the shower 22 or the currant 24 is opened and hot water supply is started, there is no inconvenience that it is necessary to wait for the water temperature to rise as before. The person can use the shower 22 and the like comfortably, and since the cooled water that comes out after the start of hot water supply is not wasted, it is also useful for saving water.

When no hot water is supplied from the hot water supply port 26, no water flow is generated in the hot water supply pipe 28, the water flow relay 36 is opened, and the heating means 31 is not energized. For this reason, it is possible to prevent unnecessary reheating when hot water is not used, and it is possible to prevent overheating that abnormally increases the pressure. That is, in general, for safety during pressure rise due to excessive heating during the sensor fault in which the hot water storage tank also comes with a small volume, but have established such safety valve, in the present reference example, a certain or more flow In addition, since heating is performed only when the water temperature is equal to or lower than a certain temperature, it is safe to prevent an increase in pressure due to overheating.

  In addition, after all the hot water remaining in the hot water supply pipe 28 is discharged from the hot water supply port 26 after the start of hot water supply, the hot water in the hot water storage tank 20 flows without staying in the hot water supply pipe 28 and exits from the hot water supply port 26. Come to come. Then, when the water temperature in the reheating pipe 38 rises and exceeds the predetermined upper limit temperature (for example, 90 ° C.), the temperature relay 34 is opened and the energization to the heating means 31 is stopped. Thereby, after the water temperature rises, it can be prevented that the warm water is reheated unnecessarily, and overheating does not occur.

In this reference example , the hot water flowing through the reheating pipe 38 must be instantaneously heated by the heating means 31, so that it is necessary to supply a large amount of power to the heating means 31. For this reason, if a commercial power source is used as the power source of the heating means 31, the contract power with the power company must be increased. However, it is necessary to supply a large amount of power to the heating means 31 only for a few liters in a short period of time immediately after the start of hot water supply. Increasing the basic contract power is costly. On the other hand, in this reference example , there is no such problem by using the storage battery 32 such as a lithium ion battery capable of outputting a large amount of power as the power source of the heating means 31, and the hot water supply system 10 is applied. The basic contract fee for electricity bills can be reduced.

  In addition, it is not necessary to circulate hot water as in the past to maintain the temperature of hot water in hot water supply pipes, so it is possible to suppress a decrease in thermal efficiency and an increase in equipment costs. Introduction of an efficient centralized hot water supply system applicable to

FIG. 3 is a longitudinal sectional view showing the configuration of the reheating unit 130 in the second reference example of the present invention. In the reference example shown in the figure, the reheating tube 138 is divided into two left and right members 138b and 138c at the intermediate portion of the enlarged diameter portion 138a, and the two members 138b and 138c are screwed together so that the reheating tube 138 is integrated. It has become. In this reference example , the water flow sensor 50 and the temperature sensor 52 are provided in the vicinity of the downstream end of the downstream member 138c. According to this reference example , the heating means 31 can be installed and maintained by loosening the screws of the members 138b and 138c of the reheating pipe 138 and removing them from each other.

4 and 5 are diagrams showing the configuration of the reheating unit 230 according to the third reference example of the present invention. FIG. 4 is a longitudinal sectional view of the reheating unit 230, and FIG. FIG. In this reference example , a tube having a constant diameter is used as the reheating tube 238, and a sheathed heater 231 is provided therein as a heating means. The sheathed heater 231 is a heating element formed by inserting a heating wire wound in a coil shape into the center of a metal pipe and filling the pipe with insulating powder so as to be integrated. However, the heating means is not limited to the sheathed heater 231, and any heater that can instantaneously generate and release heat can be used.

  As shown in FIG. 5, the sheathed heater 231 is held at a substantially central portion of the reheating tube 238 by a spacer 200 disposed along the inner peripheral surface of the reheating tube 238. The spacers 200 are provided at appropriate intervals in the circumferential direction of the inner peripheral surface of the reheating pipe 238 so that hot water can flow through the gaps in the reheating pipe 238. Preferably, the spacer 200 is made of a material having excellent heat dissipation, and efficiently transmits heat generated by the sheathed heater 231 to hot water.

As in the first reference example , the reheating pipe 238 has an upstream end (left side in the drawing) screwed into the end of the hot water supply pipe 28 a and a downstream end connected to the hot water supply pipe via the water flow sensor 50. The temperature sensor 52 is disposed near the downstream end of the reheating pipe 238. In this reference example , installation and maintenance of the sheathed heater 231 serving as heating means can be performed by loosening and removing the screwed portions of the reheating pipe 238 and the hot water supply pipe 28a.

Figure 6 is a longitudinal sectional view showing a configuration of reheating unit 330 in the implementation of the invention. As shown in the figure, the reheating unit 330 in the present embodiment includes a support 302 and a housing 304 that accommodates the support 302. An inlet portion 304a and an outlet portion 304b are provided on the lower surface of the housing 304 in the figure. Hot water is supplied from the hot water supply pipe 28 to the inlet portion 304a, and hot water heated by the reheating unit 330 is supplied from the outlet portion 304b to the hot water supply pipe. It flows out downstream of 28. A water flow sensor 50 and a temperature sensor 52 are disposed in the vicinity of the outlet portion 304b.

  The housing 304 includes a cylindrical wall portion 304c and a discharge passage 304d provided outside the cylindrical wall portion 304c. And the support body 302 is accommodated in the inside of the cylinder wall part 304c.

  The support 302 is a hollow cylindrical member made of, for example, ceramic. On the outer peripheral surface of the support 302, a spiral groove 302a provided in a spiral shape is formed between the lower end and the upper end. Around the spiral groove 302a, a heating wire 306 made of tungsten, a nickel-based alloy, or the like is wound as a heating means. Electric power is supplied to the heating wire 306 from the heating control unit 35. A space between the spiral groove 302a and the inner surface of the cylindrical wall portion 304c is a spiral flow path through which hot water flows. The lower end portion of the flow path communicates with the inlet portion 304a, and the upper end portion communicates with the discharge passage 304d. Accordingly, the hot water flowing in from the inlet 304a flows spirally upward in the drawing in the drawing, and flows out from the outlet 304b through the discharge passage 304d.

  According to this embodiment, since the hot water is heated by the heating wire 306 while flowing through the spiral flow path, the length of the heating flow path becomes long, and the hot water can be efficiently reheated.

In each of the above reference examples and embodiments, at least the reheating tubes 38, 138, 238, or the periphery of the housing 304 is packed with a heat insulating material, so that the reheating tubes 38, 138, 238, or the housing 304 are sealed. It is desirable to be able to efficiently reheat hot water inside.

In addition, the reference example of the configuration for reheating the hot water is not limited to the configuration of the reheating units 30, 130, 230, and 330 in the above embodiment, and any configuration is possible as long as the hot water passing through the hot water supply pipe 28 can be reheated. May be. For example, in each of the above reference examples and embodiments, the heating means (heater) is provided inside the reheating tube or the housing. However, the present invention is not limited thereto, and the heating means is provided outside the reheating tube or the housing. The hot water flowing in the pipe or the housing may be heated. When heating from the outside of the pipe, a heating means can be provided outside the hot water supply pipe 28 without using a reheating pipe which is a separate member from the hot water supply pipe 28.

In the reference example and the embodiment described above, the storage battery 32 can be charged with a commercial power source for 24 hours. However, the present invention is not limited to this, and the secondary storage battery cost will be significantly reduced in the future, reaching an economically established level. In such a case, a secondary storage battery having a large capacity (for example, about 40 kWh) may be installed and charged with night power, or may be charged with a distributed power source such as a solar cell, or a commercial power source and a solar power source. It is good also as charging with a hybrid system with a battery etc.

1 is an overall configuration diagram of a hot water supply system that is a first reference example of the present invention. It is a longitudinal cross-sectional view which expands and shows the reheating part of this reference example , and its vicinity. It is a longitudinal cross-sectional view which shows the structure of the reheating part in the 2nd reference example of this invention. It is a longitudinal cross-sectional view which shows the structure of the reheating part in the 3rd reference example of this invention. It is a cross-sectional view which shows the structure of the reheating part in the 3rd reference example of this invention. It is a cross-sectional view showing the configuration of a reheat unit in the implementation of the invention.

Explanation of symbols

10 hot water supply systems, 20 hot water storage tanks, 22 showers,
24 currants, 26 hot water outlets, 28, 28a, 28b hot water supply piping,
30, 130, 230, 330 Reheating section, 31 Heating means,
32 battery, 34 temperature relay, 36 water flow relay,
38, 138, 238 reheat pipe, 38a, 138a expanded diameter part,
50 water flow sensor, 52 temperature sensor,
231 sheathed heater (heating means), 306 heating wire (heating means)

Claims (10)

A hot water supply pipe reheating system for reheating hot water supplied from a hot water storage tank to a hot water outlet through a hot water supply pipe,
Provided in the vicinity of the hot water supply port in the hot water supply pipe, the heating means for heating by being energized, and a reheat section to reheat the hot water flowing through the hot water supply pipe,
The reheating unit
A cylindrical housing provided with an inlet part through which the hot water supply pipe flows in and an outlet part through which hot water flows out;
A cylindrical support provided in the housing and having a spiral groove formed on the outer peripheral surface;
A heating wire as the heating means wound around the spiral groove,
Hot water supplied from the inlet portion flows through the space between the spiral groove and the inner peripheral surface of the housing, and flows out from the outlet portion. Pipe reheating system.   When there is a predetermined amount or more of water flow in the hot water supply pipe and the water temperature in the hot water supply pipe is equal to or lower than a predetermined lower limit temperature, the hot water is reheated by the heating means, and heating is stopped when the predetermined upper limit temperature is reached. The hot water supply pipe reheating system according to claim 1, further comprising a heating control means for performing the heating control.   The hot water supply pipe reheating system according to claim 1, further comprising a storage battery as a main power source of the heating means.   When there is a predetermined amount of water flow in the hot water supply pipe and the water temperature in the hot water supply pipe is equal to or lower than a predetermined lower limit temperature, energization is performed from the storage battery to the heating means, and a predetermined upper limit temperature is reached. 4. The hot water supply pipe reheating system according to claim 3, further comprising heating control means for stopping energization. The heating control means includes
Water flow detection means for detecting the amount of water flow in the hot water supply pipe or the presence or absence of a water flow of a predetermined amount or more;
Water temperature detecting means for detecting the water temperature in the hot water supply pipe;
A water flow relay that closes when it is detected by the water flow detection means that there is a predetermined amount or more of water,
A temperature relay that closes when the water temperature detected by the water temperature detecting means is equal to or lower than a predetermined lower limit temperature and opens when the predetermined upper limit temperature is reached, and
The hot water supply pipe reheating system according to claim 4, wherein the water flow relay and the temperature relay are connected in series between the storage battery and the heating means. The heating control means includes
Water flow detection means for detecting the amount of water flow in the hot water supply pipe or the presence or absence of a water flow of a predetermined amount or more;
Water temperature detecting means for detecting the water temperature in the hot water supply pipe, and there is a water flow of a predetermined amount or more in the hot water supply pipe based on detection information by the water flow detection means and detection information by the water temperature detection means. And when the water temperature in the hot water supply pipe is below a predetermined lower limit temperature, the heating means is energized, and when the water flow is less than a predetermined amount or the water temperature is higher than a predetermined upper limit temperature, the energization is stopped. The hot water supply pipe reheating system according to claim 4, wherein the electronic control is performed.   The hot water supply pipe reheating system according to any one of claims 3 to 6, further comprising charging means for charging the storage battery with a commercial power source.   The storage battery is at least one of 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, and a capacitor. The hot water supply pipe reheating system according to any one of claims 3 to 7. A hot water storage tank for storing hot water;
A hot water supply pipe for guiding the hot water stored in the hot water storage tank to the hot water outlet;
A reheating unit that is provided at a position near the hot water supply port in the hot water supply pipe and reheats the hot water flowing through the hot water supply pipe by heating means that generates heat when energized;
With
The reheating unit
A cylindrical housing provided with an inlet part through which the hot water supply pipe flows in and an outlet part through which hot water flows out;
A cylindrical support provided in the housing and having a spiral groove formed on the outer peripheral surface;
A heating wire as the heating means wound around the spiral groove,
Hot water supplied from the inlet portion flows through the space between the spiral groove and the inner peripheral surface of the housing, and flows out from the outlet portion. system. A hot water supply method for supplying hot water stored in a hot water storage tank from a hot water supply port via a hot water supply pipe,
In the vicinity of the hot water outlet in the hot water piping,
The hot water supply pipe is provided with a cylindrical housing having an inlet portion through which hot water flows and an outlet portion through which hot water flows out, and a cylindrical housing provided in the housing and having a spiral groove formed on an outer peripheral surface thereof. And a heating wire wound around the spiral groove and heated by using a storage battery as a main power source, and the hot water flowing from the inlet portion is connected to the spiral groove and the inner periphery of the casing. A reheating part configured to flow through the space between the surfaces and out of the outlet part,
When there is a predetermined amount or more of water flow in the hot water supply pipe and the water temperature in the hot water supply pipe is equal to or lower than a predetermined lower limit temperature, the reheating unit reheats the hot water flowing through the hot water supply pipe, A hot water supply method characterized by stopping heating when an upper limit temperature is reached.

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