JP2023119623A - Hot water supply system - Google Patents

Abstract

To provide a hot water supply system capable of securely delivering hot water from a hot water delivery terminal.SOLUTION: A hot water supply system has: an instantaneous hot water circulation circuit for circulating hot water between a hot water supply source and a hot water delivery terminal 400; instantaneous hot water temperature detection means 74 for detecting a temperature of hot water in the instantaneous hot water circulation circuit; and an instantaneous hot water circulation pump 73 provided in the instantaneous hot water circulation circuit. After an operation of the instantaneous hot water circulation pump 73 is started, when the temperature of the hot water in the instantaneous hot water circulation circuit becomes a predetermined instantaneous hot water stop temperature or more and an operating time from the start of the operation of the instantaneous hot water circulation pump 73 becomes a predetermined instantaneous hot water stop time or more, the instantaneous hot water circulation pump 73 is stopped.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hot water supply system. In particular, the present invention relates to a hot water system with instant hot water capability.

Conventionally, a hot water supply circulation pipe that forms a circulation flow path between a hot water storage tank, a hot water supply pipe, and a water supply pipe, a circulation pump that circulates hot water in the hot water supply circulation pipe, and a circulation that detects the temperature of hot water in the hot water supply circulation pipe. An electric water heater has been proposed which includes a temperature sensor and has an instant hot water function of activating and stopping the circulation pump based on the temperature detected by the circulation temperature sensor (for example, Patent Document 1).

Japanese Unexamined Patent Application Publication No. 2004-19967

By the way, in a hot water supply system used in a facility such as a beauty salon, in order to stably supply a large amount of hot water at a predetermined hot water supply temperature to a plurality of hot water supply terminals such as showers and faucets, the hot water supply system has a heating heat source and a hot water storage tank. The hot water supply source is installed outside the facility, and the hot water supply source and the hot water outlet terminal are connected by a pipe having a certain length. In such a hot water supply system, when hot water is not used at the hot water supply terminal, the piping is cooled by natural heat radiation. degrade performance. For this reason, as in Patent Document 1, a circulation circuit is provided between a hot water supply source and a hot water supply terminal, and a circulation pump and a temperature sensor are provided in the circulation circuit. to raise the temperature of hot water in the circulation circuit.

However, if the length of the pipe is long, the ambient temperature of a part of the pipe space where the pipe is laid may be high, or the pipe may be provided with heating means such as a heater to prevent freezing. In some cases, the piping that supplies hot water from the hot water supply source to the hot water supply terminal and the piping that returns hot water from the hot water supply terminal to the hot water supply source are arranged in different piping paths. Therefore, depending on the position where the temperature sensor is installed, the temperature sensor may detect the temperature of locally heated water, and the operation of the circulation pump may be stopped before the temperature of the hot water in the circulation circuit rises. be.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water supply system capable of reliably discharging warm water from a hot water discharge terminal.

According to the invention,
a hot water supply source for supplying hot water to the hot water supply terminal;
a hot water circulation circuit for circulating hot water between a hot water supply source and a hot water outlet terminal;
hot water temperature detection means for detecting the temperature of hot water in the hot water circulation circuit;
a hot water circulation pump provided in the hot water circulation circuit;
a control device for executing instant hot water control for increasing the temperature of hot water in the instant hot water circulation circuit by operating the instant hot water circulation pump;
After starting the operation of the hot water circulation pump, the control device sets the temperature of hot water in the hot water circulation circuit to a predetermined hot water stop temperature or higher, and the operation time from the start of operation of the hot water circulation pump is a predetermined time. Provided is a hot water supply system having a control configuration for stopping a hot water circulation pump when the hot water stop time is exceeded.

According to the hot water supply system, after the hot water circulation pump is started to operate, the temperature of the hot water in the hot water circulation circuit becomes equal to or higher than the predetermined hot water stop temperature, and the operation time from the start of the hot water circulation pump. is equal to or longer than the predetermined hot water stop time, the hot water circulation pump is stopped, so that only a part of the piping is heated and the hot water temperature locally rises to the predetermined hot water stop temperature or higher in the hot water circulation circuit. Even if it becomes, the instant hot water circulation pump is operated until the predetermined instant hot water stop time. As a result, the temperature of the hot water in the instant hot water circulation circuit can be raised, so that warm hot water can be reliably discharged from the hot water discharge terminal.

Preferably, in the hot water supply system,
The hot water supply source has a heating heat source, a hot water storage tank for storing hot water heated by the heating heat source, and a heating circulation circuit for circulating the hot water between the heating heat source and the hot water storage tank,
The hot water circulation circuit is formed between the hot water storage tank and the hot water outlet terminal,
The instant hot water stop temperature is set lower than the set hot water storage temperature of the hot water stored in the hot water storage tank.

According to the hot water supply system, the hot water supply source includes a heating heat source, a hot water storage tank for storing hot water heated by the heating heat source, and a heating circulation circuit for circulating the hot water between the heating heat source and the hot water storage tank, The hot water circulation circuit is formed between the hot water storage tank and the hot water outlet terminal, and the hot water stop temperature is set lower than the hot water storage set temperature of the hot water stored in the hot water storage tank. When the hot water at the stop temperature returns to the hot water storage tank and the hot water is supplied from the hot water storage tank to the heating heat source, the heating heat source can surely heat the hot water sent from the hot water storage tank. As a result, hot water heated by the heating heat source can be returned to the hot water storage tank, so hot water at a predetermined hot water supply temperature can be supplied from the hot water storage tank to the hot water outlet terminal.

Preferably, in the hot water supply system,
The instant hot water stop time is set according to the piping length of the hot water supply pipe from the hot water storage tank to the hot water outlet terminal.

According to the above hot water supply system, the immediate hot water stop time is set according to the pipe length of the hot water supply pipe from the hot water storage tank to the hot water outlet terminal. The amount of hot water returned from the hot water circulation circuit to the hot water storage tank is restricted, and unnecessary circulation of hot water can be prevented, and the collapse of temperature stratification of hot water in the hot water storage tank caused by excessive circulation of hot water can be prevented. can be suppressed. As a result, it is possible to supply hot water at a predetermined hot water supply temperature from the hot water storage tank to the hot water supply terminal.

As described above, according to the present invention, it is possible to provide a hot water supply system that can reliably supply hot water from hot water supply terminals.

FIG. 1 is a schematic configuration diagram showing an example of a hot water supply system according to an embodiment of the present invention. FIG. 2 is a flow chart showing a control operation in instant hot water control of the hot water supply system according to the embodiment of the present invention. FIG. 3 is a data table showing the correspondence relationship between the pipe length and the instant hot water stop time in the instant hot water control of the hot water supply system according to the embodiment of the present invention.

A hot water supply system according to an embodiment of the present invention will be described below.
FIG. 1 is a schematic configuration diagram showing an example of a hot water supply system according to the present embodiment. This hot water supply system can be used in commercial facilities such as beauty salons. The hot water supply system includes a hot water supply pressurized tank unit 1 and a heat source unit 500, and is configured to supply water from the hot water supply pressurized tank unit 1 to a plurality of hot water discharge terminals 400 such as showers and faucets. . The heat source device unit 500 has a first gas heat source device 501 and a second gas heat source device 502 which are heating heat sources. The hot water supply pressurization tank unit 1 includes a water supply tank 2 that receives primary water supply, and a hot water storage tank 6 that stores hot water heated by the first and second gas heat source devices 501 and 502 . The hot water supply system may have one or three or more gas heat source machines as heating heat sources, or may use a heat pump, an electric heater, or the like instead of the gas heat source machines.

The first and second gas heat source devices 501 and 502 are gas water heaters, and have heating units having gas burners, heat exchangers, etc. in their housings (not shown). The first and second gas heat source devices 501, 502 and the hot water tank 6 are provided with a heating feed pipe 40 that sends hot water from the hot water storage tank 6 and water from the water supply tank 2 to the first and second gas heat source devices 501, 502. , and a heating return pipe 44 for returning hot water heated by the first and second gas heat source devices 501 and 502 to the hot water storage tank 6 . In this embodiment, the first and second gas heat source devices 501 and 502, the hot water storage tank 6, the heating supply pipe 40 and the heating return pipe 44 constitute a hot water supply source.

The heating supply pipe 40 has one end connected to the lower part of the hot water storage tank 6 and the other end connected to the first gas heat source device 501 and the second gas heat source device 502. 2 heating feed pipe 42 is branched. In the heating return pipe 44, the first heating return pipe 45 and the second heating return pipe 46, which are connected to the gas heat source devices 501 and 502 at one end, join in the middle, and the other end is connected to the upper part of the hot water storage tank 6. ing. In addition, a heating supply temperature sensor 50 is interposed upstream from the branching portion of the first and second heating supply pipes 41 and 42 in the heating supply pipe 40 and downstream from the confluence with the water supply pipe 3 described later. ing.

A first heating circulation pump 51 and a second heating circulation pump 52 are interposed in the first and second heating pipes 41 and 42, respectively, and downstream of the first and second heating circulation pumps 51 and 52, Check valves 53 and 54 are interposed. Therefore, by operating the first and second heating circulation pumps 51 and 52 and operating the first and second gas heat source devices 501 and 502, the heat heated by the first and second gas heat source devices 501 and 502 Hot water is stored in a hot water storage tank 6. - 特許庁The first and second heating circulation pumps 51 and 52 are connected to the hot water supply control device C, and the operation and stop of the pumps and the number of revolutions thereof are controlled by control signals from the hot water supply control device C. FIG. Further, the heat source machine control devices C1 and C2 of the first and second gas heat source machines 501 and 502 are connected to the hot water supply control device C, and control signals from the hot water supply control device C control the first and second gas heat source machines. The operation of 501, 502 is controlled. A detection signal of the detected temperature detected by the heating forward temperature sensor 50 is output to the hot water supply control device C, and a detection signal of the detected temperature etc. , are output to the heat source machine control devices C1 and C2.

An under-tank temperature sensor for detecting the temperature of hot water supplied from the hot water storage tank 6 to the heating pipe 40 is installed in the heating pipe 40 connected to the lower part of the hot water storage tank 6 upstream of the confluence with the water supply pipe 3. 55 and a valve 56 are interposed. A detection signal of the detected temperature detected by the under-tank temperature sensor 55 is output to the hot water supply control device C. As shown in FIG. The valve 56 can be manually opened and closed, but may be configured to be controlled to be opened and closed by a control signal from the hot water supply controller C. FIG.

The hot water storage tank 6 is a tank made of metal (for example, stainless steel) having excellent corrosion resistance, and its outer circumference is covered with a heat insulating material (not shown). The capacity of the hot water storage tank 6 of this embodiment is, for example, 50L. To the lower part of the hot water storage tank 6 are connected the already described heating feed pipe 40 and the hot water supply return pipe 72 for returning hot water from the hot water outlet terminal 400 to be described later. A return pipe 44 is connected to a hot water supply forward pipe 71 leading to a hot water outlet terminal 400, which will be described later. A first stored hot water temperature sensor 61, a second stored hot water temperature sensor 62, and a third stored hot water temperature sensor 63 for detecting the temperature of the hot water inside the hot water storage tank 6 are attached in order from above at predetermined intervals. It is The hot water supply pressurization tank unit 1 also has an outside air temperature sensor 80 below the hot water storage tank 6 to detect the outside air temperature. Detection signals of the temperatures detected by these temperature sensors 61 , 62 , 63 , 80 are output to the hot water supply control device C. As shown in FIG.

The heating return pipe 44 connected to the top of the hot water storage tank 6 has an automatic air vent valve 57 for exhausting the air in the hot water storage tank 6 and a heating return temperature sensor for detecting the temperature of the hot water flowing into the hot water storage tank 6. 58 are interposed. A detection signal of the detected temperature detected by the heating return temperature sensor 58 is output to the hot water supply controller C. As shown in FIG.

Above the hot water storage tank 6, a substantially rectangular box-shaped water supply tank 2 for supplying water to the gas heat source units 501 and 502, the hot water storage tank 6, and the hot water outlet terminal 400 is arranged. The capacity of the water supply tank 2 of this embodiment is, for example, 45L. A primary water supply pipe 10 through which city water flows is connected to the upper portion of the water supply tank 2 , and a water supply pipe 3 is connected to the lower portion of the water supply tank 2 . The primary water supply pipe 10 branches into two primary water supply pipes 11 and a second primary water supply pipe 12 and is connected to the water supply tank 2. The first and second primary water supply pipes 11 and 12 each have , a first governor 13 and a second governor 14, and a first water supply solenoid valve 15 and a second water supply solenoid valve 16 are interposed in this order from the upstream side. The first and second water supply solenoid valves 15 and 16 are connected to the hot water supply control device C and are controlled to open and close by control signals from the hot water supply control device C. FIG. By connecting the plurality of primary water supply pipes 11 and 12 to the water supply tank 2 in this way, pressure loss can be reduced and water can be supplied to the water supply tank 2 in a short period of time. Although not shown, the water supply tank 2 is partially open to the atmosphere.

The water supply tank 2 has an opening in one side wall below the connection port of the first and second primary water supply pipes 11 and 12 and above the connection port of the water supply pipe 3 . An overflow pipe 200 is connected to the opening in this side wall. On the other side wall of the water tank 2, an overflow sensor 22, a Hi float sensor 23, a Low float sensor 24, and a Low water level float sensor 25 for detecting the water level in the water tank 2 are arranged in this order from above at predetermined intervals. It is arranged in Although not shown, in the water supply tank 2, a substantially U-shaped trap pipe is provided in which one end communicates with the overflow pipe 200, the other end is substantially at the same height as the overflow sensor 22, and is open upward. ing. Therefore, excess water is discharged outside through the trap tube and the overflow tube 200 . Detection signals of water levels detected by the float sensors 22, 23, 24, and 25 are output to the hot water supply controller C. As shown in FIG.

A water supply pipe 3, one end of which is connected to the lower portion of the water supply tank 2, branches upstream into a first water supply pipe 31 and a second water supply pipe 32 so that water flows in parallel. A water supply pressurizing pump 37 is interposed upstream of the branched portion of the first water supply pipe 31 and the second water supply pipe 32 . The water supply pressurizing pump 37 is connected to the hot water supply control device C, and the operation and stop of the water supply pressure pump 37 and the number of revolutions thereof are controlled by control signals from the hot water supply control device C. FIG.

A check valve 33 and a pressure sensor (pressure detection means) 35 for detecting water pressure are interposed in the first water supply pipe 31 in this order from the upstream side. A check valve 34 and a water quantity sensor (water quantity detection means) 36 for detecting the flow rate of water are interposed in this order. Although the pressure sensor and the water volume sensor can be interposed in a single water channel without providing parallel water channels, the water channels are formed so that the water flows in parallel, and the pressure sensor and the water volume sensor are installed in each channel. By interposing the pressure loss can be reduced. Although the water flow rate is different for each channel, if the pressure loss is known, the water flow rate of the entire water supply pipe 3 can be calculated from the water flow rate detected by the water flow rate sensor 36 . A detection signal of the detected pressure detected by the pressure sensor 35 and a detection signal of the detected flow rate detected by the water quantity sensor 36 are output to the hot water supply controller C. FIG.

The first water supply pipe 31 and the second water supply pipe 32 join at a junction downstream of the pressure sensor 35 and the water quantity sensor 36, and the other end of the water supply pipe 3 is connected to the lower part of the hot water storage tank 6. It is connected to the confluence with the heating feed pipe 40 . Further, the water supply pipe 3 branches off into a water supply feed pipe 38 connected to the hot water discharge terminal 400 downstream from the confluence of the first and second water supply pipes 31 and 32 . Therefore, in the present embodiment, by operating the water supply pressure pump 37, water is supplied to the hot water storage tank 6, the gas heat source devices 501 and 502 and the hot water outlet terminal 400, and the first and second water supply pipes 31 and 32 and The water supply pipe 3 including the water supply pipe 38 constitutes a water supply circuit. The water supply pipe 38 is branched into a plurality of branches according to the number of showers and faucets of the hot water supply terminal 400 . A check valve 39 is interposed in the water supply pipe 3 on the downstream side of the branched portion of the water supply supply pipe 38 .

A hot water supply return pipe 72 having one end connected to the lower part of the hot water storage tank 6 has the other end connected to the hot water supply forward pipe 71 at a hot water discharge terminal 400 . An instant hot water circulation pump 73 is interposed in the hot water supply return pipe 72, and an instant hot water return temperature sensor (instant hot water temperature detection means) 74 and a check valve 75 are interposed downstream of the instant hot water circulation pump 73. is set. Therefore, in the present embodiment, by operating the hot water circulation pump 73, hot water is circulated between the hot water storage tank 6 and the hot water outlet terminal 400. The pipe 71 and the hot water supply return pipe 72 constitute a hot water circulation circuit.

The instant hot water control in the hot water supply system of the present embodiment will be described later, but to summarize the main operation control, when the hot water tap of the hot water supply terminal 400 is opened and the operation of the water supply pressure pump 37 is started, If the temperature of the hot water detected by the third stored hot water temperature sensor 63 is higher than the predetermined hot water storage start temperature, the first and second heating circulation pumps 51 and 52 are not operated, and the water supply pipe 3 and the hot water storage tank are supplied from the water supply tank 2 to the hot water storage tank. Water is supplied to the hot water storage tank 6 through a heating supply pipe 40 under the tank connected to 6, and hot water in the hot water storage tank 6 is supplied to a hot water supply terminal 400 through a hot water supply supply pipe 71. In addition, when the temperature of hot water drops due to the supply of water into the hot water storage tank 6 and the temperature of the hot water detected by the third stored hot water temperature sensor 63 becomes equal to or lower than the hot water storage start temperature, the first and second heating circulation pumps 51 , 52 are started, hot water is supplied from the lower part of the hot water storage tank 6 to the heating feed pipe 40, the water from the water supply tank 2 and the hot water from the hot water storage tank 6 are mixed, and the first and second gases are supplied. It is supplied to heat source machines 501 and 502 . The hot water heated to a predetermined hot water temperature by the first and second gas heat source devices 501 and 502 is returned to the hot water storage tank 6 through the heating return pipe 44 . Also, hot water is delivered from the hot water storage tank 6 to the hot water supply pipe 71, and is supplied to the hot water supply terminal 400 through the hot water supply supply pipe 71 (hot water supply control).

When the temperature of the hot water detected by the third stored hot water temperature sensor 63 becomes equal to or lower than the hot water storage start temperature while all the hot water outlet terminals 400 are closed, the first and second heating circulation pumps 51 and 52 start operating. The hot water in the hot water storage tank 6 is supplied to the first and second gas heat source devices 501 and 502, and the hot water heated to a predetermined hot water outlet temperature by the first and second gas heat source devices 501 and 502 is supplied to the hot water storage tank 6. , the temperature of the hot water in the hot water storage tank 6 is maintained (hot water storage control).

The first and second heating circulation pumps 51, 52 are operated simultaneously or individually according to the amount of hot water used at the hot water supply terminal 400, etc., and the first and second gas heat source devices 501, 502 are operated accordingly. are also activated simultaneously or separately.

The hot water supply system includes a hot water supply control device C provided in the hot water supply pressurized tank unit 1, heat source device control devices C1 and C2 provided in the first and second gas heat source devices 501 and 502, and operations related to the operation of the hot water supply system. and a remote control R for the user to perform The hot water supply control device C and the heat source device control devices C1 and C2 are connected by wire or wirelessly so as to be able to communicate with each other, and the hot water supply control device C and the remote controller R are connected by wire or wirelessly so as to be able to communicate with each other. ing.

The remote control R turns on/off the power supply of the hot water supply system, sets the hot water storage temperature in the hot water storage tank 6 (the first and second gas heat source units 501, 502, the temperature of the hot water discharged from 502), the setting of the water pressure mode, and other operation information to the hot water supply control device C. The remote control R is provided with a display for displaying various information of the hot water supply system. Instead of the remote controller R, or together with the remote controller R, a portable terminal such as a smart phone or a tablet terminal communicably connected to the hot water supply control device C can be used.

Each of the hot water supply control device C and the heat source device control devices C1 and C2 is composed of one or more electronic circuit units including a CPU, a ROM, a RAM, an interface circuit, and the like. The memory stores various data such as various operation programs and set values for executing the operation programs.

Detection signals from the various sensors (temperature sensors 50, 55, 58, 61, 62, 63, 74, 80, pressure sensor 35, water volume sensor 36, float sensors 22 to 25) are input to the hot water supply control device C. At the same time, driving operation information is input from the remote controller R. Detection signals from various sensors (not shown) provided in the first and second gas heat source devices 501 and 502 are input to the heat source device control devices C1 and C2, and control signals are output to the hot water supply control device C. The hot water supply control device C controls the operation of the entire hot water supply system by controlling the operations of the gas heat source units 501 and 502, the various pumps 37, 51, 52 and 73, the water supply solenoid valves 15 and 16, and the like. Therefore, in the present embodiment, the hot water supply control device C and the heat source device control devices C1 and C2 constitute the control device of the hot water supply system. Note that one control device may control the operation of the entire hot water supply system without providing the heat source device control devices C1 and C2.

Next, referring to FIG. 2, the control operation of instant hot water control in the hot water supply system of the present embodiment will be described.
If the hot water circulation pump 73 is stopped while the remote controller R is on (Yes in step S1), the outside temperature detected by the outside air temperature sensor 80 is acquired, and according to the acquired outside temperature, A predetermined instant hot water start time t1 is set and a timer is started (step S2).

The instant hot water start time t1 is a value obtained by experiment. In the hot water supply system of the present embodiment, for example, when the outside temperature is 5° C., the instant hot water start time t1 is 15 minutes. Note that the instant hot water start time t1 can be appropriately set according to the configuration of the hot water supply system.

Next, it is determined whether or not the flow rate of water detected by the water flow rate sensor 36 is equal to or less than a predetermined lower limit flow rate M (for example, 0.1 L/min) (step S3). If the flow rate of water is greater than the lower limit flow rate M (No in step S3), the hot water supply terminal 400 is being used, so the timer is reset.

If the flow rate of water detected by the water sensor 36 is equal to or less than the predetermined lower limit flow rate M (Yes in step S3), and the stop time of the hot water circulation pump 73 continues for the hot water start time t1 or longer (step Yes in S4), the operation of the hot water circulation pump 73 is started at a predetermined number of revolutions (step S5).

When the hot water circulation pump 73 is started to operate, a predetermined hot water stop time t2 set according to the length of the hot water supply pipe 71 from the hot water storage tank 6 to the farthest hot water discharge terminal 400 shown in FIG. 3 is measured. To do so, start a timer. The instant hot water stop time t2 is also a value obtained by experiment, and can be appropriately set according to the configuration of the hot water supply system. Although not shown, since the hot water circulation circuit is provided with an orifice, when the hot water circulation pump 73 is operated at a predetermined number of revolutions, the hot water flowing through the hot water circulation circuit is is substantially constant. This makes it possible to easily set the instant hot water stop time t2.

Next, the operation time of the hot water circulation pump 73 continues for the hot water stop time t2 or longer, or the temperature of the hot water detected by the hot water return temperature sensor 74 is higher than the hot water storage set temperature of the hot water storage tank 6 (for example, 60° C.). It is determined whether or not the temperature T2 (for example, 50° C., preferably equal to or lower than the hot water storage start temperature) has continued for a predetermined duration tm (for example, 5 seconds) or higher (steps S6 to S7). ).

Then, if the operation time of the hot water circulation pump 73 is equal to or longer than the hot water stop time t2 and the temperature of the hot water continues to be equal to or higher than the hot water stop temperature T2 for the continuous time tm (Yes in steps S6 and S7), The hot water circulation pump 73 is stopped (step S9).

On the other hand, if the operation time of the hot water circulation pump 73 is less than the hot water stop time t2 (No in step S6), or if the temperature of the hot water does not continue at the hot water stop temperature T2 or higher for the duration tm (step If the flow rate of water detected by the water sensor 36 is equal to or lower than the lower limit flow rate M (No in step S8), the hot water circulation pump 73 continues to operate until both conditions are met. During the hot water control, when the hot water supply terminal 400 is started to be used and the flow rate of water exceeds the lower limit flow rate M (Yes in step S8), the hot water circulation pump 73 is stopped (step S9).

As described above, according to the present embodiment, after the hot water circulation pump 73 is started to operate, the temperature of the hot water in the hot water circulation circuit becomes equal to or higher than the predetermined hot water stop temperature, and the hot water circulation pump When the operation time from the start of operation of 73 exceeds the predetermined hot water stop time, the hot water circulation pump 73 is stopped, so that only a part of the pipe is heated and the hot water temperature is locally increased in the hot water circulation circuit. is equal to or higher than the predetermined instant hot water stop temperature, the instant hot water circulation pump 73 is operated until the predetermined instant hot water stop time. Thus, in hot water control, the temperature of hot water in the hot water circulation circuit can be reliably raised, and even when the use of hot water is started at the hot water outlet terminal 400 at an arbitrary timing, the hot water outlet terminal 400 can be reliably operated. Hot water can be discharged.

Further, according to the present embodiment, the hot water supply sources are the first and second gas heat source devices 501 and 502, and the hot water storage tank 6 for storing hot water heated by the first and second gas heat source devices 501 and 502. , and a heating circulation circuit for circulating hot water between the first and second gas heat source devices 501 and 502 and the hot water storage tank 6, and the hot water circulation circuit is formed between the hot water storage tank 6 and the hot water outlet terminal 400. Since the instant hot water stop temperature is set lower than the stored hot water set temperature of the hot water stored in the hot water storage tank 6, hot water at the instant hot water stop temperature in the instant hot water circulation circuit returns to the hot water storage tank 6 by the hot water circulation. For example, when hot water is supplied from the lower part of the hot water storage tank 6 to the first and second gas heat source devices 501 and 502 in order to heat the hot water in the hot water storage tank 6 in the hot water storage control described above, the first and second gas heat sources Hot water can be reliably heated by the machines 501 and 502.例文帳に追加As a result, the temperature of the hot water in the hot water storage tank 6 can be maintained at the hot water set temperature or higher, and hot water at a predetermined hot water supply temperature can be supplied to the hot water supply terminal 400 .

Further, according to the present embodiment, since the instant hot water stop time is set according to the piping length of the hot water supply pipe 71 from the hot water storage tank 6 to the hot water discharge terminal 400, the hot water temperature in the hot water supply pipe 71 is and the amount of hot water returned from the hot water circulation circuit to the hot water storage tank 6 is restricted to prevent unnecessary circulation of hot water, thereby reducing the amount of hot water in the hot water storage tank caused by excessive circulation of hot water. Disruption of temperature stratification of hot water in 6 can be suppressed. As a result, it is possible to stably supply hot water at a predetermined hot water supply temperature from the hot water storage tank 6 to the hot water supply terminal 400 .

As described above, according to the present embodiment, it is possible to provide a hot water supply system capable of reliably discharging hot water from hot water supply terminal 400, so that it can be suitably used in facilities such as beauty salons.

2 water supply tank 3 water supply pipe 35 pressure sensor 36 water quantity sensor 37 water supply pressure pump 6 hot water storage tank 40 heating supply pipe 44 heating return pipe 71 hot water supply supply supply pipe 72 hot water supply return pipe 73 hot water circulation pump 74 hot water return temperature sensor 501, 502 Gas heat source machine C Hot water supply controller C1, C2 Heat source machine controller

Claims (3)

a hot water supply source for supplying hot water to the hot water supply terminal;
a hot water circulation circuit for circulating hot water between a hot water supply source and a hot water outlet terminal;
hot water temperature detection means for detecting the temperature of hot water in the hot water circulation circuit;
a hot water circulation pump provided in the hot water circulation circuit;
a control device for executing instant hot water control for increasing the temperature of hot water in the instant hot water circulation circuit by operating the instant hot water circulation pump;
After starting the operation of the hot water circulation pump, the control device sets the temperature of hot water in the hot water circulation circuit to a predetermined hot water stop temperature or higher, and the operation time from the start of operation of the hot water circulation pump is a predetermined time. A hot water supply system having a control configuration for stopping a hot water circulation pump when the hot water stop time is exceeded. In the hot water supply system according to claim 1,
The hot water supply source has a heating heat source, a hot water storage tank for storing hot water heated by the heating heat source, and a heating circulation circuit for circulating the hot water between the heating heat source and the hot water storage tank,
The hot water circulation circuit is formed between the hot water storage tank and the hot water outlet terminal,
A hot water supply system in which the instant hot water stop temperature is set lower than the set temperature of the hot water stored in the hot water storage tank. In the hot water supply system according to claim 2,
The hot water supply system sets the instant hot water stop time according to the length of the hot water supply pipe from the hot water storage tank to the hot water outlet.

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