JP4201718B2 - Automatic temperature control method for hot water storage water heater - Google Patents

Description

The present invention relates to an automatic temperature control method for a hot water storage type hot water heater that can save energy by controlling the boiling temperature of hot water stored in a tank of a hot water heater of variable boiling temperature type.

In the hot water storage type water heater, the rising temperature of the stored hot water in the tank is determined according to the amount of normal hot water used and the intake water temperature. If we take the hot-water storage-type electric water heater as an example, late at night in order to reduce the power of using hot water, Ri is cheaper to name usage fees, so that the boiling hot water by effectively using this time zone. Therefore, it is possible to save energy by setting the boiling temperature of the hot water low.

  However, since there are variations in the number of hot water users and the usage conditions of the users, the time zone when the amount of hot water used is small varies. For this reason, it is very difficult to appropriately set the time zone for lowering the temperature of the warm water, and the time for lowering the temperature is inevitably short. Moreover, the hot water heater generally tends to be set at a high temperature so as not to be in a state where hot water cannot be supplied, that is, a so-called hot water out condition.

In order to avoid such wasteful use of electricity due to a high temperature setting and realize energy saving, water heaters to which various power saving functions have been added have been proposed. For example, store the time using the hot water boiled by the water heater in the past 8 days, set the operating time and reserve time from the hot water usage data, perform power saving operation by lowering the set temperature in the unused time hot water A vessel has been proposed.

  There has also been proposed a water heater with a variable power saving function for each day of the week. For example, on a day of the week when the timer is not set, if the day of the week continues for two weeks and the number of uses is less than one, the day of the week is judged to be a holiday, and the water heater that performs power saving operation from the morning of the next weekday Has also been proposed.

Japanese Patent Application Laid-Open No. 2000-74494 discloses an automatic water temperature control method for an electric water heater. A time zone in which the amount of hot water used by the electric water heater is small is determined. There has been proposed a control method for setting a low value.
JP 2000-74494 A

  The automatic temperature control method for an electric water heater described in Patent Document 1 detects the amount of hot water used for each time zone in which the unit period is divided into predetermined times, and the hot water usage detected for each time zone. Is stored for a plurality of unit periods, and based on the stored data, the unit period is distinguished into a time zone in which the amount of hot water used is large and a time zone in which the amount of hot water used is small. This is a control method in which the temperature is set lower than the heat retention temperature in the time zone when it is determined that the amount of hot water used is large.

However, in the above conventional automatic temperature control method for an electric water heater, the boiling temperature of the water heater (electric water heater) is set to be variable, but in actual use, the user of the water heater is manually set. This is a control method for changing the set temperature. Since the control method is complicated, the actual situation is that the user does not sequentially change the set temperature. Therefore, there are many cases where the temperature is set higher than the required boiling temperature. Since state where the are heated more than necessary is mostly, it has a problem that is likely to consume a nighttime power wastefully even cheaper rates for precious.

  The present invention has been developed to solve the above-described problems. That is, the purpose of the present invention is not to judge only the amount of hot water used for switching the set temperature of the water heater, but the usage conditions such as the number of water heaters used or not used in the kitchen, the intake temperature, etc. Automatic determination of hot water storage water heaters that can be controlled with the minimum necessary power consumption by making decisions based on many conditions such as the set environment and automatically controlling the temperature according to changes in the conditions. The object is to provide a temperature control method.

According to the present invention, there is provided an automatic temperature control method for a water heater that automatically controls the boiling temperature of a hot water storage type water heater, wherein the hot water supply has a tank capacity, the number of users, and the amount of hot water used in a kitchen / bathroom. Various information related to the use conditions of the water heater is stored, information on the environmental conditions such as the intake water temperature around the water heater is always collected, and based on the stored use conditions according to the changes in the collected environmental conditions With regard to the set temperature for boiling to satisfy the minimum amount of hot water required for the tank of the water heater, first, whether the number of people in the long term or the number of people in the short term is the number of people in the short term If this is the case, maintain the set temperature at the current level, and then when the number of users changes over a long period of time, if the number of users decreases, the tank capacity and heater capacity of the water heater Flip and the lower temperature setting, contrary to when the number of employees is increased to a high temperature setting, finally, on the basis of the average temperature data measured for each day intake temperature data and the last week the measured intake temperature, the intake temperature (Tw0) when there is no change (Tw0 = Tw1) waits for a lapse of a predetermined time period, when then the measured intake temperature (Tw0) has become time for raising and lowering the temperature of the previous measurement, and boiling Updates the water intake temperature (Tw), waits for a certain period of time when it is not time to boil up, and then when the number of non-use days (Ds) is more than one day , the number of people and the kitchen, cooking, wash and have you in the bathroom, when the boil on rising set temperature calculated based on a hot water required for use in the use temperature, determined for each switch to its set temperature, characterized in that the hot-water Automatic temperature control method of the water heater is provided.

For example, in the determination to switch the set temperature, when changing from a cold time to a hot time, from the results calculated based on the intake water temperature measurement data for several days, even when the rate of increase in the water temperature is higher than a predetermined calculated value, Although the set temperature is maintained as it is, when the rate of increase in the water temperature reaches a predetermined calculated value higher than the predetermined calculated value , each of the determined temperatures is determined to be lowered, and the set temperature is switched.
In the determination of switching the set temperature, when it is determined that the rate of decrease in the intake temperature is higher than a predetermined value based on the intake temperature data, which is an environmental condition measured over several days, when the temperature changes from a hot time to a cold time, Switch the set temperature to a cold setting so that it does not run out.

  When determining that the set temperature is to be switched, when it is determined that the amount of hot water used per unit time is higher than a predetermined value, the set temperature is switched to be higher according to the increased ratio.

  The set temperature is preferably displayed on the operation panel of the water heater so that the operation status of the water heater can be referred to.

In this invention, based on the usage conditions such as the number of people using the water heater, the use of the kitchen and the washroom, etc., each set temperature is determined according to changes in the set environmental conditions such as the intake temperature of tap water. The necessary boiling temperature is automatically set. Therefore, the temperature can be accurately set, the necessary minimum power consumption can be suppressed, and unnecessary nighttime power consumption can be avoided.
In addition, there is a change in the family structure because it is not a method of simply switching the set temperature of the water heater based on the amount of hot water used, but a control method that switches the set temperature according to the change in the number of water heater users. Sometimes the temperature is not set too high.

  Even at the turn of the season, such as from cold to hot or from hot to cold, the temperature setting is determined based on factors that combine the outside air temperature data for several days. It is possible to respond automatically and accurately. For example, even in the case of a sudden change in the outside air temperature, it is possible to avoid an erroneous temperature setting that switches to a higher temperature setting in a season where the early morning is cold but the daytime is not yet cold.

  In addition, since there are many visitors, even if a large amount of hot water is used, such as an increase in the use time in the kitchen, the number of times the bath is used, and the number of times the bathroom is used, the hot water does not run out.

  The automatic temperature control method of the hot water storage type water heater of the present invention calculates the required amount of hot water to be used (standard of each hot water temperature, for example, a bath at 42 ° C., for example, 300 L) by setting the usage of hot water, the number of users, etc. This is a method of calculating the boiling temperature required to cover the amount of hot water required by the tank capacity from the intake temperature of tap water or well water mixed at the time of use, and setting it automatically. This automatic setting suppresses the necessary minimum power consumption and avoids unnecessary nighttime power consumption.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic explanatory view of an automatic temperature control method for a hot water storage type hot water heater according to the present invention.
The present invention is a temperature control method when hot water is supplied to a bath, cooking (kitchen), washing surface, and heating (floor heating or the like) using a hot water storage type water heater. In the example of illustration, it has shown that many hot water is supplied to a bath and heating, and is then supplied in order of cooking and a wash surface. For example, the temperature is Tvb (° C.) and a hot water amount of Vb (L) is supplied to the bath. For cooking, the temperature is Tvc (° C.) and the amount of hot water of Vc (L) is supplied. A temperature of Tvf (° C.) and a hot water amount of Vf (L) are supplied to the washing surface. Moreover, the temperature is Tvw (° C.) and the amount of hot water of Vw (L) is supplied for heating.

In the temperature control method of the present invention, water is supplied from a tap water or the like to a hot water storage type water heater at a water intake temperature Tw, and at this time, the minimum water intake temperature (Twn ·· Tw3, Tw2, Tw1) for each day is measured. The average Tav for the past week is maintained. Based on these average temperature data, the required boiling temperature is automatically set based on usage conditions such as the number of hot water users, use / non-use in the kitchen, and setting environment such as the outside air temperature.

FIG. 2 is a block diagram showing an example of an automatic temperature control method for a hot water storage type hot water heater according to the present invention.
A system for carrying out the automatic temperature control method for a hot water storage type hot water heater according to the present invention includes an arithmetic processing unit 1, a database 2, an input unit 3, an output unit 4, an input processing unit 5, a judgment processing unit 6, and an output processing unit 7. It is comprised from. The database 2 includes the water heater data 9 regarding the tank capacity and the heater capacity of the water heater 8, the number of people who use the water heater 8, and the number of users 10 such as whether or not it is determined for a long period of time and the water supply temperature. It consists of usage condition data such as environmental data 11. Water taken from a water supply pipe 12 such as a water supply is boiled by a water heater 8, and the hot water is supplied from a hot water supply pipe 13 to a bathroom, a kitchen, and a washroom.

  The arithmetic processing device 1 executes various arithmetic processing based on the usage state of the water heater 8 input from the input device 3. The arithmetic processing device 1 performs an input processing unit 5 for performing input processing, water heater data 9, and number of users data 10. The determination processing unit 6 that determines based on the installation environment data 11, and the output processing unit that outputs the optimum set temperature as a result of the determination to the output device 4 and performs control processing for switching the temperature setting of the water heater 8. 7 is provided. The set temperature is displayed on the operation panel 14 of the water heater 8 so that the operation status of the water heater 8 can be referred to.

FIG. 3 is a schematic diagram showing parameters stored in advance.
When carrying out the automatic temperature control method of the present invention, parameters are stored in advance. First, the amount of hot water required at each use temperature is stored as a standard hot water amount table.
As bath water volume, Vb = minimum hot water volume + hot water volume / person x P + morning bath extra hot water volume x presence / absence bath usage temperature Tvb ° C
Cooking hot water volume Vc = hot water volume / person x P
Cooking use temperature Tvc ℃
Washing bath amount Vf = amount of hot water / person x P
Washing temperature Tvf ℃
Heating hot water volume Vw = hot water volume / area x S
In addition, heating means heating places, such as floor heating, a toilet, and a washroom.
Heating temperature Tvw ℃

Next, other constants are stored.
Standard boiling temperature Tnh ℃
Maximum boiling temperature Tmax ° C
Tank capacity Vtv ℃
Amount of usage Vupdn = 1. n, 1, 0. n

Further, for the tap water temperature, the following items measured by the temperature sensor 15 are stored.
Daily minimum water temperature (latest) Tw1 ℃
Daily minimum water temperature (previous) Tw2-Twn ℃
Average intake water temperature Tav ℃
Intake temperature Tw ℃
Of course, well water can be used for water supply.

FIG. 4 is a flowchart showing input items for initialization.
Next, manually input data to be initialized. First, the power is turned on and the above parameters are manually input. In addition, manual set data includes “use / non-use setting”, “with / without bath, cooking (kitchen), washroom, floor heating”, “number of users P”, “heating area S”, “use type use” Amount standard Vupdn: standard / large / small ”or“ non-use days Ds ”.

The amount of hot water used for each purpose of use is updated from the set data such as setting of use and number of users. Each amount of hot water used is calculated based on the following formula.
The amount of hot water used in the bath is Vtvb = Vb × Vupdn.
The amount of hot water used for cooking is Vtvc. When hot water is not used for cooking, Vtvc = 0. In other cases, Vtvc = Vc × Vupdn.
The amount of hot water used for the toilet is Vtvf. Note that Vtvf = 0 when hot water is not used for the washing surface. Otherwise, Vtvf = Vf × Vupdn.
The amount of hot water used for heating is Vtvw. When hot water is not used for heating, Vtvw = 0. Otherwise, Vtvw = Vw × Vupdn.
The boiling temperature is calculated based on these calculations.

FIG. 5 is a flowchart for calculating the boiling temperature.
First, the intake water temperature Tw0 is measured, and when there is no change (Tw0 = Tw1), it waits for a fixed time. Thereafter, the water intake temperature (Tw0) is measured, and the water intake temperature Tw is updated when the water intake temperature falls below the temperature of the previous measurement and it is time to perform boiling. If it is not time to boil, wait for a certain period of time.

Next, when the number of unused days Ds is more than one day, the boiling calculated from the number of users and the standard regarding the amount of hot water required for use at each usage temperature in the kitchen, cooking, bathroom and bathroom, ie, the usage temperature standard raise boiling at elevated temperature. In this way, when there is a day when the water heater is not used, the boiling temperature is switched.

FIG. 6 is a flowchart when the intake water temperature is updated.
First, when the intake water temperature Tw is updated, the unused days Ds are determined, and when the unused days Ds is not 0, that is, when there are unused days, the previous data of the lowest daily water temperature (latest) is adopted. (Tw1 = Tw2).
When the non-use days Ds is 0, that is, when it is used every day, the intake water temperature history is updated (Twi = Tw (i−1) n to 2). An average value excluding a maximum value of average intake water temperature Tav = Twi = n˜2 is used. In addition, when there is a fluctuation in the intake water temperature, there is a possibility of running out of hot water, so the average value excluding the maximum value is used.

Next, when the latest daily minimum water temperature Tw1 is equal to or higher than the average intake water temperature Tav, the intake water temperature Tw is set to the average intake water temperature Tav. When the latest daily minimum water temperature Tw1 is not equal to or higher than the average intake water temperature Tav and when the intake water temperature Tw is the latest daily minimum water temperature Tw1, the temperature is set to that temperature.
If the unused setting is not set and the unit is not used for absence, etc., it prevents the water temperature of the intake water temperature sensor 15 from rising and misjudgment, and runs out of water when the intake water temperature rises due to climate change. Is to prevent.

  The daily update data is retained as shown in Table 1. That is, the minimum intake water temperature Twn ·· Tw3, Tw2, Tw1 for each day was measured at 19 ° C, 18 ° C, 20 ° C, 22 ° C, 16 ° C, 10 ° C, 11 ° C, and the average value Tav15.7 ° C was obtained. Hold.

FIG. 7 is a flowchart for calculating the boiling temperature from the hot water amount based on the use temperature.
First, data is set manually for the above-described use temperature-based hot water amount. When renewing the standard hot water volume, the use non-use is set, and the hot water volume used for each purpose of use is updated from data such as the number of users.
The amount of hot water used in the bath is Vtvb = Vb × Vupdn.
The amount of hot water used for cooking is Vtvc. When hot water is not used for cooking, Vtvc = 0. Otherwise, Vtvc = Vc × Vupdn.
The amount of hot water used for the toilet is Vtvf. Note that Vtvf = 0 when hot water is not used for the washing surface. Otherwise, Vtvf = Vf × Vupdn.
The amount of hot water used for heating is Vtvw. When hot water is not used for heating, Vtvw = 0. Otherwise, Vtvw = Vw × Vupdn.
Based on these calculation results, the boiling temperature is calculated.

FIG. 8 is a flowchart for calculating the boiling temperature from the relationship between the intended use temperature and the amount of hot water used.
In order to cover all the usage temperature and amount of hot water used for each purpose , the boiling temperature is calculated using the following formula.
About the bath (Th−Tvb) Vtvb = (Tvb−Tw) (Vtvb−Vthb) →
Th × Vthb = (Tvb−Tw) Vtvb + Tw × Vthb
About cooking (Th−Tvc) Vtvc = (Tvc−Tw) (Vtvc−Vthc) →
Th × Vthc = (Tvc−Tw) Vtvc + Tw × Vthc
About the wash surface (Th−Tvf) Vtvf = (Tvf−Tw) (Vtvf−Vthf) →
Th × Vthf = (Tvf−Tw) Vtvf + Tw × Vthf
About heating (Th−Tvw) Vtvw = (Tvw−Tw) (Vtvfw−Vthfw) →
Th × Vthw = (Tvw−Tw) Vtvw + Tw × Vthw
About tank capacity Vtv => Vthb + Vthc + Vthf + Vthw

Boiling temperature Th => Tw + ((Tvb−Tw) Vtvb + (Tvc−Tw) Vtvc) + (Tvf−Tw) Vtvf + (Tvw−Tw) Vtvw / Vtv
When the boiling temperature is higher than the maximum temperature, “hot water shortage display” is displayed, and the boiling temperature is set to the maximum value.

An example of processing by the automatic temperature control method of the present invention will be described.
Regarding the number of users in the usage conditions, whether the number of people in the long term or the number of people in the short term is switched manually. By this switching, when the number of users is long, the temperature is set according to the tank capacity and heater capacity of the water heater 8. For example, when a family of four originally used a water heater 8 with a tank capacity of 400 liters, but the children were reduced in number after that, the water heater was set so that the required minimum power consumption was achieved. Set the temperature to a low temperature according to the tank capacity and heater capacity. Conversely, it was initially a family of two, but when the number of family members subsequently increased and the amount of hot water used increased, the required boiling temperature was set accordingly so that the required power consumption was reduced to the minimum required power consumption. Set high.

On the other hand, such as when the relatives and acquaintances came to stay, even if the number of employees increased, as well as when the family has increased in some cases to use the amount of hot water does not increase steadily. In such a case, wasteful nighttime power consumption is avoided by maintaining the current state without increasing the set temperature.

  Next, the set temperature is automatically switched from the result calculated based on the measurement data of the intake water temperature for several days by the temperature sensor 15 attached to the water supply pipe 12. For example, as shown in FIG. 6, the boiling temperature is switched to a higher set temperature or the current state is maintained based on the measurement result and the calculation result for the intake water temperature. This prevents an accidental switch to a higher temperature setting even in a season where the outside air temperature changes and the early morning cools, but it is not cold during the day.

When changes to hot season from cold season, as shown in FIG. 6, even when the calculation value of the increase rate of the water temperature was calculated based on the measurement data of the intake temperature in a few days is high, the set temperature as a rule is status quo To. When the rate of increase in the water temperature reaches a predetermined calculated value that is higher than the predetermined calculated value, it is possible to avoid unnecessary consumption of nighttime power by lowering the set temperature.

Conversely, when the change in the cold season from hot weather, as the water temperature decrease rate of which is calculated based on the measurement data of the intake temperature in a few days is higher than the predetermined calculation value can not be the hot water out, the set temperature Is switched to a setting for a cold period, that is, a higher set temperature.

  Furthermore, when it is determined that the amount of hot water used per unit time is higher than a predetermined calculated value, the set temperature can be switched to a higher setting according to the increased ratio. Thereby, since there are many visitors, even if a large amount of hot water such as an increase in the use time in the kitchen or the number of times of using the bath is used, the hot water does not run out.

  In the above-described example, the method for determining the set temperature based on the use conditions such as the number of water heaters used and whether or not used in the kitchen and the water temperature are described in detail. The method is not limited to the above-described configuration as long as it is a method that suppresses power consumption to a limited extent, and for example, various conditions and threshold values can be varied, and various methods can be used without departing from the scope of the present invention. Of course, it can be changed.

  The automatic temperature control method of the hot water storage type hot water heater according to the present invention is such that when the intake water temperature rises at the turn of the season, such as from winter to spring and further to summer, the temperature rises and falls depending on the day and the amount of hot water used increases and decreases. Therefore, when the intake water temperature rises, it is possible to prevent running out of hot water by adopting the past average intake temperature.

  On the other hand, with regard to the drop in water intake temperature at the change of season, such as from summer to autumn and further to winter, it is possible to avoid boiling out water and follow the boiling temperature to keep the set temperature low and minimize the required power consumption. can do.

It is a schematic explanatory drawing of the automatic temperature control method of the hot water storage type water heater of this invention. It is a block diagram which shows the automatic temperature control method of the hot water storage type water heater of this invention. It is the schematic which shows the parameter memorize | stored beforehand. It is a flowchart which shows the input item for initialization. It is a flowchart for calculating boiling temperature. It is a flowchart when updating intake water temperature. It is a flowchart when calculating boiling temperature from the amount of hot water of a utilization temperature reference | standard. It is a flowchart when calculating the boiling temperature from the relationship between the utilization temperature of the intended purpose and the amount of hot water used.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Arithmetic processing device 2 Database 3 Input device 4 Output device 5 Input processing part 6 Judgment processing part 7 Output processing part 8 Water heater 9 Water heater data 10 Personnel number data 11 Installation environment data 12 Water supply piping 13 Hot water supply piping 14 Operation panel 15 Temperature Sensor

Claims (5)

An automatic temperature control method for a water heater that automatically controls the boiling temperature of a hot water storage type water heater,
Stores various information related to the use conditions of the water heater, such as the tank capacity of the water heater, the number of users and the amount of hot water used in the kitchen / bathroom,
Always collect information on environmental conditions such as the water intake temperature around the water heater,
According to this change in the collected environmental conditions, the set temperature for boiling to satisfy the minimum amount of hot water necessary for the tank of the water heater based on the stored use conditions,
First, if the condition of whether the number of people in the long term or the number of people in the short period is the number of people in the short period, the set temperature is maintained as it is,
Next, when the number of users varies over a long period of time, when the number of people decreases, the temperature setting is set to a low temperature according to the tank capacity and heater capacity of the water heater, and conversely, when the number of users increases, a high temperature setting is set. West,
Finally, based on the average temperature data of the intake temperature data measured and the past week the measured intake temperature by the day, when there is no change in its water intake temperature (Tw0) (Tw0 = Tw1) waits for a lapse of a predetermined time period , then the measured intake temperature (Tw0) is lowered than the temperature of the previous measurement, and boiling is carried out when it is time up updates the intake temperature (Tw), for a predetermined time when it is not time to perform the boiling wait for the course, then, when not in use the number of days (Ds) is more than one day, use the number and the kitchen, cooking, and have you in the basin and bathroom, on the basis of the amount of hot water needed to use at each use temperature When the calculation was boiling on rising set temperature, determined for each switch to its set temperature, automatic temperature control method for a hot water storage type water heater, characterized in that. An automatic temperature control method for a water heater that automatically controls the boiling temperature of a hot water storage type water heater,
Stores various information related to the use conditions of the water heater, such as the tank capacity of the water heater, the number of users and the amount of hot water used in the kitchen / bathroom,
Always collect information on environmental conditions such as the water intake temperature around the water heater,
According to this change in the collected environmental conditions, the set temperature for boiling to satisfy the minimum amount of hot water necessary for the tank of the water heater based on the stored use conditions,
First, if the condition of whether the number of people in the long term or the number of people in the short period is the number of people in the short period, the set temperature is maintained as it is,
Next, when the number of users varies over a long period of time, when the number of people decreases, the temperature setting is set to a low temperature according to the tank capacity and heater capacity of the water heater, and conversely, when the number of users increases, a high temperature setting is set. West,
Finally, when the change in the hot season from cold weather, the result of calculation based on the measurement data of the intake temperature in a few days, even when the rate of increase in the water temperature is higher than the predetermined calculation value, set temperature to maintain the status quo However, when the rate of increase in the water temperature reaches a predetermined calculated value that is higher than the predetermined calculated value, when the set temperature is lowered, each is determined and switched to the set temperature. Automatic temperature control method of the vessel. An automatic temperature control method for a water heater that automatically controls the boiling temperature of a hot water storage type water heater,
Stores various information related to the use conditions of the water heater, such as the tank capacity of the water heater, the number of users and the amount of hot water used in the kitchen / bathroom,
Always collect information on environmental conditions such as the water intake temperature around the water heater,
According to this change in the collected environmental conditions, the set temperature for boiling to satisfy the minimum amount of hot water necessary for the tank of the water heater based on the stored use conditions,
First, if the condition of whether the number of people in the long term or the number of people in the short period is the number of people in the short period, the set temperature is maintained as it is,
Next, when the number of users varies over a long period of time, when the number of people decreases, the temperature setting is set to a low temperature according to the tank capacity and heater capacity of the water heater, and conversely, when the number of users increases, a high temperature setting is set. West,
Finally, when changing from a hot season to a cold season, based on the intake temperature data, which is an environmental condition measured over several days, if it is determined that the rate of decrease in the intake temperature is higher than the specified value, the hot water will not run out. An automatic temperature control method for a hot water storage type water heater, characterized in that the set temperature is switched to a cold time setting. An automatic temperature control method for a water heater that automatically controls the boiling temperature of a hot water storage type water heater,
Stores various information related to the use conditions of the water heater, such as the tank capacity of the water heater, the number of users and the amount of hot water used in the kitchen / bathroom,
Always collect information on environmental conditions such as the water intake temperature around the water heater,
According to this change in the collected environmental conditions, the set temperature for boiling to satisfy the minimum amount of hot water necessary for the tank of the water heater based on the stored use conditions,
First, if the condition of whether the number of people in the long term or the number of people in the short period is the number of people in the short period, the set temperature is maintained as it is,
Next, when the number of users varies over a long period of time, when the number of people decreases, the temperature setting is set to a low temperature according to the tank capacity and heater capacity of the water heater, and conversely, when the number of users increases, a high temperature setting is set. West,
Finally, when it is determined that the amount of hot water used per unit time is higher than a predetermined numerical value, the set temperature is switched to be higher according to the increased ratio, and the automatic temperature control method for the hot water storage type hot water heater is characterized in that .   5. The automatic temperature control method for a hot water storage type hot water heater according to claim 1, wherein the set temperature is displayed on an operation panel of the hot water heater so that an operating state of the hot water heater can be referred to.