JP6849941B2 - Hot water supply system - Google Patents

Description

The present invention relates to a hot water supply system in which hot water is filled at a temperature lower than a set bathtub target temperature, and when a person's bathing thereafter is detected, the hot water in the bathtub is heated to the bathtub target temperature after a lapse of a set delay time.

Conventionally, a hot water supply system configured to automatically execute a hot water filling operation and a subsequent heat retention operation with a hot water amount and a hot water temperature set by operating an operating means provided in the hot water supply system has been widely used. Since the hot water supply system controls the amount and temperature of hot water, it is easy to prepare for bathing and you can take a comfortable bath.

As such a hot water supply system, for example, the automatic bath device of Patent Document 1 is known. This automatic bath device keeps warm at a temperature 2 to 3 ° C lower than the preset hot water temperature (bathtub target temperature) until a person takes a bath, and when it detects a person taking a bath, it takes a predetermined time (for example, 3 to 5 minutes). ) After the lapse, heat the hot water in the bathtub to the target temperature of the bathtub. This configuration reduces the degree to which the cold body feels the hot water in the bathtub hot, especially in winter, and when the body gets used to the temperature of the hot water, raises the temperature to the target temperature of the bathtub so that it does not feel slimy.

By the way, many accidents during bathing occur in winter, and the number of bathing accidents for the elderly is increasing year by year. For example, according to the 2012/2013 survey by the Ministry of Health, Labor and Welfare, "Study on Understanding the Actual Conditions of Bathing-related Accidents and Preventive Measures," the number of deaths from bathing accidents is estimated to be about 19,000 per year nationwide, and will continue to be social. It is expected to increase with the aging of the population.

Blood pressure fluctuations due to swelling and heat shock are considered to be the main causes of bathing accidents. This fluctuation in blood pressure causes the sympathetic nerve to increase due to thermal stimulation immediately after bathing, and the blood pressure temporarily rises due to the contraction of skin blood vessels, and then the contracted blood vessels expand due to the warming of the body, resulting in a decrease in blood pressure. It is a phenomenon. Especially in winter, since the temperature is low, the skin blood vessels are contracted before bathing, and the skin blood vessels are further contracted immediately after bathing, so that the fluctuation of blood pressure tends to be large.

On the other hand, the water pressure during bathing pushes the blood in the lower limbs and abdomen toward the upper body, and the blood pressure rises. At this time, sudden rise in the bathtub may cause a sudden drop in blood pressure, resulting in a cerebral ischemic state, which may cause transient disturbance of consciousness. Such blood pressure fluctuations may trigger brain diseases, heart diseases, etc. in the elderly.

Special Fair 7-81735 Gazette

In order to suppress such fluctuations in blood pressure during bathing and prevent bathing accidents, the invention of Patent Document 1 states how to set the bathtub temperature when a person is not bathing and the predetermined time after bathing is detected during bathing. It is unclear whether it is possible to suppress fluctuations in blood pressure. Therefore, in the invention of Patent Document 1, it is difficult to achieve both safety and comfort of bathing because there is a possibility that the blood pressure fluctuation may be increased depending on these settings and the comfort may be impaired. Is.

Therefore, the applicant has invented a hot water supply system that conducts a bathing experiment to find out the relationship between bathing and blood pressure fluctuation, and controls the temperature based on this relationship. An object of the present invention is to provide a hot water supply system capable of achieving both safety and comfort in automatic bath operation for filling and keeping warm water.

The invention of claim 1 is a water heater for heating hot water, a bathtub, a circulation passage for connecting the water heater and the bathtub, filling the bathtub with hot water, and circulating the hot water. In a hot water supply system provided with an operating means for operating the water heater and a person detecting means for detecting a person in the bathtub, the temperature can be changed from the bathtub target temperature by operating the operating means when the bathtub is filled with hot water. When the hot water is filled at the initial hot water filling temperature lower than the set temperature and the person in the bathtub is not detected by the person detecting means, the hot water in the bathtub is kept at the initial hot water filling temperature and the person detecting means is used to heat the hot water. When a person in the bathtub is detected, the hot water in the bathtub is heated to the bathtub target temperature after the set delay time elapses, and the set delay time is set according to the initial hot water filling temperature. It is said.

According to the above configuration, since the hot water temperature of the bathtub at the start of bathing is the initial hot water filling temperature which is lower than the target bathtub temperature by the set temperature which can be changed by the operation of the operation means, it is possible to suppress the fluctuation of blood pressure at the time of bathing. Since it can be done, safety can be ensured. In addition, after the set delay time according to the initial hot water filling temperature elapses from the start of bathing, the hot water in the bathtub is heated to the target bathtub temperature, so that the bather can quickly take a bath at the hot water temperature set by the bathtub, which is comfortable. Sex can be secured. Moreover, since the bather can set the initial hot water filling temperature at the start of bathing as needed, comfort can be improved.
The invention of claim 2 comprises a water heater for heating hot water, a bathtub, a circulation passage for connecting the water heater and the bathtub, filling the bathtub with hot water, and circulating the hot water. In a hot water supply system provided with an operating means for operating the water heater and a person detecting means for detecting a person in the bathtub, hot water is filled with hot water at an initial hot water filling temperature lower than the target bathtub temperature by a set temperature when the bathtub is filled with hot water. When the person is stretched and the person detecting means does not detect the person in the bathtub, the hot water in the bathtub is kept at the initial hot water filling temperature, and when the person detecting means detects the person in the bathtub, the bathtub is kept warm. After the set delay time elapses, the hot water in the bathtub is heated to the bathtub target temperature, and the bathroom temperature detecting means is provided. The set delay time is set according to the initial hot water filling temperature and is set by the bathroom temperature detecting means. It is characterized in that the detected bathroom temperature is changed so as to be shortened when it is equal to or higher than a predetermined reference bathroom temperature.
According to the above configuration, since the hot water temperature of the bathtub at the start of bathing is the initial hot water filling temperature which is lower than the target temperature of the bathtub by the set temperature, the fluctuation of blood pressure at the time of bathing can be suppressed, so that safety can be ensured. In addition, after the set delay time according to the initial hot water filling temperature elapses from the start of bathing, the hot water in the bathtub is heated to the target bathtub temperature, so that the bather can quickly take a bath at the hot water temperature set by the bathtub, which is comfortable. Sex can be secured. Moreover, when the bathroom temperature is warmer than the reference bathroom temperature, safety can be ensured even if the set delay time is shortened, and comfort can be further improved by shortening the set delay time.

The invention of claim 3 is characterized in that, in the invention of claim 1 or 2 , the set delay time is set so that the higher the initial hot water filling temperature is, the longer the set delay time is.

According to the above configuration, since the set delay time is set according to the initial hot water filling temperature, the blood pressure fluctuation does not become large, so that safety can be ensured. Further, the lower the initial hot water filling temperature, the earlier the timing of heating to the bathtub target temperature, so that the comfort can be further improved.

The invention of claim 4 is the invention of any one of claims 1 to 3 , wherein the hot water supply system includes an outside air temperature detecting means, and the outside air temperature detected by the outside air temperature detecting means is equal to or higher than a predetermined reference outside air temperature. In some cases, the set delay time is changed so as to be short.

According to the above configuration, when the outside air temperature is warmer than the reference outside air temperature, safety can be ensured even if the set delay time is shortened, and comfort can be further improved by shortening the set delay time.

The invention of claim 5 is the invention of any one of claims 1 to 4 , wherein the person detecting means is a bathtub water level detecting means, and is detected by the bathtub water level detecting means in the hot water filling state of the initial hot water filling temperature. When the bathtub water level is equal to or lower than a predetermined reference water level, the set delay time is changed so as to be shortened.

According to the above configuration, when the bathtub water level in the hot water-filled state is below the standard water level, safety can be ensured even if the set delay time is shortened, and comfort can be further improved by shortening the set delay time. it can.

According to the present invention, it is possible to provide a hot water supply system capable of achieving both safety and comfort in automatic bath operation for filling and keeping warm water.

It is a schematic diagram of the hot water supply system of this invention. It is a figure which shows the operation button of the operation means of the hot water supply system. It is a figure which shows the temperature control of the hot water of the bathtub of the bath automatic operation which concerns on an Example. It is a figure which shows the delay time corresponding to the initial hot water filling temperature. It is a flowchart of the bath automatic operation control which concerns on embodiment.

Hereinafter, embodiments for carrying out the present invention will be described based on examples.

First, the overall configuration of the hot water supply system 1 of the present invention will be described with reference to FIG.
The hot water supply system 1 has a water heater 2 and a bathtub 3, and the water heater 2 and the bathtub 3 are connected by a circulation passage 4. Further, the hot water supply system 1 includes an operation means (remote controller 5) for operating the water heater 2 and a person detection means (water level sensor 6) for detecting a person in the bathtub 3. A bathroom temperature detecting means (bathroom temperature sensor 7) is provided in the bathroom in which the bathtub 3 is installed.

The water heater 2 is a gas water heater that heats hot water using the combustion heat of fuel gas in the burner 8, and supplies clean water in the hot water heat exchanger 9, the reheating heat exchanger 10, and the hot water heat exchanger 9. A hot water supply passage 11 for heating, a reheating passage 12 for heating the hot water of the bathtub 3 in the reheating heat exchanger 10, and the like are provided. A circulation pump 13 is interposed upstream of the reheating heat exchanger 10 in the reheating passage 12, and a hot water filling passage 14 branched from the hot water supply passage 11 is connected to the reheating passage 12 via the circulation pump 13. ing.

In the reheating passage 12, a water level sensor 6 which is a bathtub water level detecting means for detecting the water level (bathtub water level) of the bathtub 3 by water pressure is arranged on the upstream side of the circulation pump 13, and is arranged on the downstream side of the circulation pump 13. A bathtub temperature detecting means (bathtub temperature sensor 15) for detecting the hot water temperature (bathtub temperature) of the bathtub 3 is provided.

Further, the water heater 2 includes an outside air temperature detecting means (outside air temperature sensor 16) for detecting the outdoor temperature and a control means 17 for controlling the hot water supply operation and the like. The remote controller 5, the water level sensor 6, the bathroom temperature sensor 7, the outside air temperature sensor 16, and the like are connected to the control means 17 in a communicable manner, and are configured to perform control based on the operation and detection data of the remote controller 5.

The circulation passage 4 is composed of a bath return passage portion 4a connected to the upstream end of the reheating passage 12 and a bath return passage portion 4b connected to the downstream end of the reheating passage 12. The circulation pump 13 is operated to send the hot water of the bathtub 3 from the bathtub return passage portion 4a to the reheating heat exchanger 10 to heat it, and the heated hot water water can be returned to the bathtub 3 from the bathtub passage portion 4b. Further, the hot water heated by the hot water supply heat exchanger 9 can be filled from the circulation passage 4 to the bathtub 3 via the hot water filling passage 14 and the reheating passage 12.

The remote controller 5 is arranged in the bathroom where the bathtub 3 is installed, and can execute the reheating operation, set the hot water supply temperature, and the like by the operation of the bather. A remote controller different from the remote controller 5 may be provided in a place other than the bathroom where hot water is used. The remote controller 5 may be provided with a bathroom temperature sensor 7, and instead of the water level sensor 6 provided in the reheating passage 12, a water level sensor capable of detecting the water level of the bathtub 3 by ultrasonic waves or the like, and infrared rays or the like are used. A person detecting means for detecting a person may be provided.

As shown in FIG. 2, the remote controller 5 has a plurality of operation switches (hereinafter, the switch is abbreviated as SW), and has an operation SW21, a bath automatic SW22, a reheating SW23, a hot water supply temperature SW24, a bath water amount SW25, and a bath temperature. It has a SW26, a display unit 27, and the like. The operation SW 21 switches between a combustion standby state and a non-combustion state, and various operations controlled by the control means 17 in the combustion standby state are performed.

When the automatic bath operation is started by operating the automatic bath SW22 in the combustion standby state, the bathtub 3 is filled with hot water and the hot water is kept warm after the hot water is filled. The reheating SW23 is for the bather to perform a reheating operation in order to heat the bathtub temperature to the bathtub target temperature Tg. The hot water supply temperature SW24 is used to change the hot water supply temperature setting, and the bath water amount SW25 and the bath temperature SW26 are used to change the bathtub hot water amount and bathtub temperature settings, respectively. The hot water supply temperature SW24 and the like are usually covered with a cover 28 to prevent erroneous operation.

Next, variable control of the bathtub temperature (hereinafter, referred to as safe bathing) in the automatic bath operation by the control means 17 will be described.
Here, bathing means that a person sits in a bathtub 3 filled with hot water and soaks in hot water. The relationship between bathing and blood pressure fluctuations found in the experiment is as follows (1) to (3).
(1) Blood pressure rises from the start of bathing, reaches the maximum value of systolic blood pressure, and then gradually decreases.
(2) The higher the bathtub temperature, the higher the maximum value of systolic blood pressure in (1).
(3) The higher the maximum value of systolic blood pressure in (1), the longer it takes to reach the maximum systolic blood pressure.

As shown in FIG. 3, the safe bathing is based on the relationship (1) to (3) above, and in order to lower the maximum value of systolic blood pressure and reduce the blood pressure fluctuation, the bathtub temperature at the start of bathing is set to the bathtub. The initial hot water filling temperature Ts is set to be lower than the target temperature Tg by the set temperature Td. The initial hot water filling temperature Ts is a temperature determined by setting the bathtub target temperature Tg and the set temperature Td respectively by operating the remote controller 5. The set temperature Td can be set in the range of, for example, 1 to 3 ° C, and the bathtub target temperature Tg can be set in the range of, for example, 34 to 48 ° C.

Between the start of bathing at time t1 and the time t2, the systolic blood pressure reaches its maximum and then the blood pressure begins to decrease. With this time as the set delay time ct, when the set delay time ct has elapsed since the start of bathing, heating is started to set the bathtub temperature to the bathtub target temperature Tg so that the bather can take a bath at the desired temperature. To do. When the bathtub temperature reaches the bathtub target temperature Tg at time t3, the heating is finished. The set delay time ct is set by calculating the delay time tw corresponding to the initial hot water filling temperature Ts shown in FIG.

If the bathroom temperature or outside air temperature before bathing is above the specified standard temperature, the systolic blood pressure at the time of bathing does not rise because the skin blood pressure does not easily contract due to the cold before bathing, so the bathtub is quick. The set delay time ct is shortened according to the bathroom temperature and the outside air temperature so that the bath can be bathed at the target temperature Tg. Further, even when the water level of the bathtub 3 is filled with water below a predetermined reference water level, the maximum value of systolic blood pressure does not increase because the increase in blood pressure due to water pressure is small, so that the set delay time tc is shortened according to the bathtub water level. ..

The set delay time ct is calculated and set by the following equation (a) based on the delay time tw, the bathroom temperature, the outside air temperature, and the bathtub water level. The coefficients Ta, To, and Wl are coefficients that reflect the bathroom temperature, the outside air temperature, and the bathtub water level, respectively, and these coefficients are set to values in the range of 0.5 to 1, for example, and calculated.
tk = tw x Ta x To x Wl ... (a)

The delay time tw is made longer as the initial hot water filling temperature Ts is higher, reflecting the relationships (1) to (3) above. The coefficients Ta, To, and Wl compare the corresponding bathroom temperature, outside air temperature, and bathtub water level with the predetermined reference bathroom temperature, reference outside air temperature, and reference water level, respectively, and determine the delay time tw when the predetermined conditions are satisfied. Set the value to shorten. The reference bathroom temperature, the reference outside air temperature, and the reference water level are preset according to the configuration and installation environment of the hot water supply system 1.

As a predetermined condition, for example, if the bathroom temperature is equal to or higher than the standard bathroom temperature (for example, 20 ° C.), the blood pressure does not rise due to vasoconstriction before bathing, so that the maximum value of systolic blood pressure at the time of bathing does not increase, so that the delay time tw is set. If the temperature is shorter than the reference bathroom temperature, the coefficient Ta is set to 1 and the delay time tw is not shortened. Similarly, if the outside air temperature is equal to or higher than the reference outside air temperature (for example, 18 ° C.), the delay time tw is shortened, and if it is less than the reference outside air temperature, the coefficient To is set to 1 and the delay time tw is not shortened. In addition, when the bathtub water level is below the reference water level (for example, 25 cm), the increase in blood pressure due to water pressure is small, so the maximum value of systolic blood pressure during bathing does not increase, so the delay time tw is shortened and the bathtub water level is higher than the reference water level. If so, the delay time tw is not shortened by setting the coefficient Wl to 1.

The delay time tw is shortened by changing the coefficients Ta, To, and Wl within the above range. The range of values that the coefficient To and the coefficient Wl can take may be limited according to the value of the coefficient Ta, and the range of values that the coefficient Wl can take may be limited according to the value of the coefficient To. For example, when the coefficient Ta is 0.5, the coefficient To and the coefficient Wl are each limited to the range of 0.8 to 1, and when the coefficient To is 0.8, the coefficient Wl is in the range of 0.9 to 1. It is limited to prevent the delay time tw from being excessively shortened.

Further, the reduction of the delay time tw corresponds to the corresponding coefficients Ta and To based on the temperature difference between the detected bathroom temperature and the reference bathroom temperature, the temperature difference between the outside air temperature and the reference outside air temperature, and the difference between the bathtub water level and the reference water level. , Wl may be configured to determine. The delay time tw may be shortened by reflecting all of the bathroom temperature, the outside air temperature, and the bathtub water level, or the delay time tw may be shortened by reflecting two or one of these.

The bathtub target temperature Tg is a bathtub temperature that can be set by operating the remote controller 5. When safe bathing is not set, the heat retention operation is performed so that the temperature detected by the bathtub temperature sensor 15 provided in the water heater 2 becomes the bathtub target temperature Tg. The bathroom temperature and the outside air temperature are detected by the bathroom temperature sensor 7 and the outside air temperature sensor 16, respectively, and the bathtub water level is detected by the water level sensor 6. Since the water level rises when a person enters the bathtub 3 in a hot water-filled state, the water level sensor 6 is used as a person detecting means for detecting a person in the bathtub 3 by utilizing the rise in the water level.

Next, the bath automatic operation control will be described with reference to FIG. Si (i = 1, 2, ...) In the figure represents a step.
First, in S1, the automatic bath operation is started by the operation of the automatic bath SW22. In the bath automatic operation, the bathtub 3 is filled with hot water and the subsequent heat retention is performed for a preset heat retention time (for example, 4 hours). The heat retention time can be appropriately changed by operating the remote controller 5. If the automatic bath SW22 is operated during the automatic bath operation, the hot water filling or heat retention is stopped and the automatic bath operation control is terminated.

Next, in S2, it is determined whether or not safe bathing is set for the automatic bathing operation. If safe bathing is set and the judgment is Yes, the process proceeds to S3, and if safe bathing is not set and the judgment is No, the process proceeds to S15.

In S3, the bathtub 3 is filled with hot water at the initial hot water filling temperature Ts. Here, for example, assuming that the bathtub target temperature Tg is set to 40 ° C. and the set temperature Td is set to 2 ° C., the initial hot water filling temperature Ts is 38 ° C.

Next, in S4, the bathroom temperature is detected by the bathroom temperature sensor 7. Next, in S5, the outside air temperature is detected by the outside air temperature sensor 16. Next, in S6, the water level sensor 6 detects the bathtub water level in the hot water-filled state. Here, it is assumed that, for example, the bathroom temperature is 22 ° C., the outside air temperature is 20 ° C., and the bathtub water level is 36 cm.

Next, in S7, the set delay time ct is calculated by the above equation (a) based on the bathroom temperature, the outside air temperature, the bathtub water level, and the delay time tw corresponding to the initial hot water filling temperature Ts detected in S4 to S6. Set. Here, since the initial hot water filling temperature Ts is 38 ° C., the delay time tw is 16 seconds (see FIG. 4). Further, since the bathroom temperature and the outside air temperature are higher than the reference bathroom temperature and the reference outside air temperature, respectively, in order to shorten the delay time tw, for example, the coefficient Ta is set to 0.5 and the coefficient To is set to 0.8, and the bathtub water level is higher than the reference water level. Therefore, the coefficient Wl is set to 1 without shortening the delay time tw due to the bathtub water level. At this time, the set delay time ct is set to 6.4 seconds.

Next, in S8, it is determined whether or not the heat retention time has elapsed since the start of the automatic bath operation. If the heat retention time has not elapsed and the determination is No, the process proceeds to S9. If the heat retention time has elapsed and the determination is Yes, the process proceeds to S18, and the bath automatic operation is terminated.

Next, in S9, the presence or absence of a person in the bathtub 3 is determined. If a person in the bathtub 3 is detected and the determination is Yes, the process proceeds to S11. If no person is detected in the bathtub 3 and the determination is No, the process proceeds to S10, the heat retention operation of the initial hot water filling temperature Ts is performed, and the process returns to S8.

Next, in S11, it is determined whether or not the set delay time ct set in S7 has elapsed. The determination of S11 is repeated until the set delay time ct elapses, and when the set delay time ct elapses, the process proceeds to S12, and a reheating operation for heating to the bathtub target temperature Tg is performed to proceed to S13.

Next, in S13, it is determined whether or not the heat retention time has elapsed since the start of the automatic bath operation. If the heat retention time has not elapsed and the determination is No, the process proceeds to S14. If the heat retention time has elapsed and the determination is Yes, the process proceeds to S18, and the bath automatic operation is terminated.

Next, in S14, the presence or absence of a person in the bathtub 3 is determined. If a person in the bathtub 3 is detected and the determination is Yes, the process returns to S13. If no person is detected in the bathtub 3 and the determination is No, the process returns to S8.

On the other hand, when safe bathing is not set in S2 and the determination is No, it is determined in S16 whether or not the heat retention time has elapsed from the start of the automatic bathing operation after filling with hot water at the bathtub target temperature Tg in S15. .. If the heat retention time has not elapsed and the determination is No, the process proceeds to S17, the heat retention operation at the bathtub target temperature Tg is performed, and the process returns to S16. If the heat retention time has elapsed and the determination is Yes, the process proceeds to S18 to end the bath automatic operation.

As described above, the hot water supply system 1 sets the bathtub temperature at the start of bathing to the initial bathtub temperature Ts, which is lower than the bathtub target temperature Tg by the set temperature Td, when safe bathing is set in the automatic bathing operation. .. As a result, the maximum value of systolic blood pressure at the time of bathing can be suppressed to a low level, so that safety can be ensured. Further, the hot water in the bathtub 3 is heated to the bathtub target temperature Tg after the set delay time ct has elapsed from the start of bathing and the systolic blood pressure reaches the maximum value. As a result, it is possible to take a bath at a preset bathtub target temperature Tg, so that comfort can be ensured.

Further, the set delay time ct is set according to the initial hot water filling temperature Ts in response to the fact that the higher the hot water temperature at the time of bathing, the longer the time from the start of bathing to the maximum value of systolic blood pressure. As a result, the hot water in the bathtub 3 can be heated to the bathtub target temperature Tg in a state where the blood pressure decreases after the systolic blood pressure reaches the maximum value, so that the hot water in the bathtub 3 is heated so as to increase the maximum systolic blood pressure. It is possible to ensure safety without any problems. Further, the lower the initial hot water filling temperature Ts, the earlier the timing of heating to the bathtub target temperature Tg, so that the comfort can be further improved. In addition, since the bathtub target temperature Tg and the set temperature Td can be changed to set the initial hot water filling temperature Ts at the start of bathing, it is possible to take a comfortable bath desired by the bather.

Further, when the bathroom temperature is warmer than the standard bathroom temperature or when the outside air temperature is warmer than the standard outside air temperature, the skin blood vessels are difficult to contract and the blood pressure does not become high before bathing. Therefore, the maximum value of systolic blood pressure at the time of bathing does not increase, and the time until the maximum value of systolic blood pressure is reached is short. Therefore, safety can be ensured even if the set delay time ct is shortened, and the set delay time is set. By shortening the tc, the comfort of bathing can be further improved.

Further, when the bathtub water level in the hot water-filled state is lower than the standard water level, the bathtub water level is low even if a person takes a bath, and the increase in blood pressure due to water pressure can be suppressed. Therefore, the maximum value of systolic blood pressure does not increase, and the time until the maximum value of systolic blood pressure is reached is short. Therefore, safety can be ensured even if the set delay time ct is shortened, and the set delay time ct is shortened. The comfort of bathing can be further improved.

When the bathtub 3 is not detected as a person after bathing and the temperature is kept at the initial hot water filling temperature Ts, for example, water may be injected to adjust the temperature to the initial hot water filling temperature Ts. Such a configuration is advantageous for ensuring the safety of the next bather.

In addition, a person skilled in the art can carry out the embodiment in a form in which various modifications are added to the embodiment without departing from the spirit of the present invention, and the present invention includes such modifications.

1 Hot water supply system 2 Water heater 3 Bathtub 4 Circulation passage 5 Remote control (operation means)
6 Water level sensor (bathtub water level detection means, person detection means)
7 Bathroom temperature sensor (bathroom temperature detecting means)
15 Bathtub temperature sensor (bathtub temperature detecting means)
16 Outside air temperature sensor (outside air temperature detecting means)
17 Control means 22 Bath automatic SW
Td set temperature Tg bathtub target temperature Ts initial hot water filling temperature ct setting delay time tw delay time

Claims (5)

A water heater for heating hot water, a bathtub, a circulation passage for connecting the water heater and the bathtub, filling the bathtub with hot water, and circulating the hot water, and operating the water heater. In a hot water supply system provided with an operating means and a person detecting means for detecting a person in the bathtub.
At the time of filling the bathtub, the bathtub is filled with hot water at an initial hot water filling temperature that is lower than the target bath temperature by a set temperature that can be changed by operating the operating means.
When the person detection means does not detect a person in the bathtub, the hot water in the bathtub is kept warm to the initial hot water filling temperature.
When a person in the bathtub is detected by the person detecting means, the hot water in the bathtub is heated to the bathtub target temperature after the set delay time elapses.
The hot water supply system is characterized in that the set delay time is set according to the initial hot water filling temperature. A water heater for heating hot water, a bathtub, a circulation passage for connecting the water heater and the bathtub, filling the bathtub with hot water, and circulating the hot water, and operating the water heater. In a hot water supply system provided with an operating means and a person detecting means for detecting a person in the bathtub.
When filling the bathtub with hot water, fill it with water at the initial hot water filling temperature, which is lower than the target bath temperature by the set temperature.
When the person detection means does not detect a person in the bathtub, the hot water in the bathtub is kept warm to the initial hot water filling temperature.
When a person in the bathtub is detected by the person detecting means, the hot water in the bathtub is heated to the bathtub target temperature after the set delay time elapses.
Equipped with bathroom temperature detection means
The set delay time is set according to the initial hot water filling temperature and is changed so as to be shortened when the bathroom temperature detected by the bathroom temperature detecting means is equal to or higher than a predetermined reference bathroom temperature. hot water supply system that. The hot water supply system according to claim 1 or 2, wherein the set delay time is set so that the higher the initial hot water filling temperature is, the longer the set delay time is. The hot water supply system includes an outside air temperature detecting means.
The invention according to any one of claims 1 to 3, wherein when the outside air temperature detected by the outside air temperature detecting means is equal to or higher than a predetermined reference outside air temperature, the set delay time is changed so as to be shortened. Hot water supply system. The person detecting means is a bathtub water level detecting means.
Claim 1 is characterized in that the set delay time is changed when the bathtub water level detected by the bathtub water level detecting means in the hot water filling state of the initial hot water filling temperature is equal to or lower than a predetermined reference water level. The hot water supply system according to any one of 4 to 4.

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