JPH06281242A - Method for adjusting temperature of hot water to be fed to bathtub - Google Patents

Abstract

PURPOSE:To prevent temperature of hot water to be fed to a bathtub at the feed point thereof from falling largely by predicting amount of fall in hot-water temperature due to radiation of heat during the time while the hot water is sent from a hot-water apparatus to the bathtub, and by adding the predicted amount of fall to a hot-water feed set temperature to obtain a hot-water delivery temperature so that the hot water is delivered from the hot-water apparatus at that temperature. CONSTITUTION:At the time of feeding hot water, a fall in temperature of hot water during the time while the hot water is sent from a hot-water apparatus 24 to a bathtub 10 is computed and stored from the data such as hot-water delivery temperature of the apparatus 24, the time period of make-up firing following the feed of hot water, time and temperature of make-up firing stored beforehand. For feeding hot water to the bathtub, when a hot-water feed temperature is set, the fall in temperture computed and stored is added to a set temperature of hot water to be fed to the bathtub to obtain a hot-water delivery set temperature of the hot-water apparatus 24. As a result, even if the bathtub and hot-water apparatus are located away from each other, feed temperature of hot water at the bathtub is prevented from becoming largely lower than the set temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting hot water discharge temperature of a water heater when hot water discharged from a water heater connected by a pipe is dropped into a relatively distant bathtub.

[0002]

2. Description of the Related Art In recent bath equipment, many hot water dispensers are provided so that hot water discharged from the water heater can be freely dropped into the bathtub. In such a bath device, it is possible to easily fill the bath at the set temperature of the bath with hot water from the water heater, if necessary.

[0003]

However, in the conventional bath apparatus, when the hot water discharged from the water heater is dropped into the bathtub, if the bath drop temperature is set, the hot water of the water heater will be discharged at the set bath temperature. Since the hot water from the hot water is dropped into the bathtub through the pipeline, the temperature when the hot water is dropped into the bathtub due to heat radiation etc. It was lower than that, so there was a drawback that after driving it down, it was necessary to spend extra time again to carry out reheating operation.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and even when there is a distance between the bathtub and the water heater, the temperature dropped into the bathtub does not become much lower than the set temperature, so that the subsequent reheating operation is performed. It is an object of the present invention to provide a method for adjusting the outlet hot water temperature for dropping in a bathtub, which can omit or shorten the time.

[0005]

In order to achieve the above object, the method of the present invention provides a hot water dispenser for hot water from a water heater when the hot water from the water heater is dropped into a bathtub in which a drop temperature is set via a pipeline. A method of adjusting hot water temperature, which predicts a decrease in hot water temperature due to heat radiation while hot water is sent from a water heater to a bath, and supplies hot water at a temperature obtained by adding the predicted decrease to the drop set temperature. The first feature is that the hot water is discharged with a vessel. The method of the present invention also comprises
In addition to the first feature described above, the relationship between the reheating time after hot water filling and the temperature rise of the bathtub is obtained as data from a preliminary experiment for each reheating time and stored, and the temperature decrease amount is stored. The second feature is that it is calculated from the hot water outlet set temperature of the water heater, the reheating time and the data at the time of the previous hot water filling. The method of the present invention also comprises
In addition to the above-mentioned first feature, for each combination of the drop pipe length from the water heater to the bathtub and the difference between the set temperature and the ambient temperature, the corresponding temperature decrease is obtained in advance through experiments. The third feature is that this is stored as data in the controller of the water heater. Further, in addition to the above-mentioned third characteristic, the method of the present invention has a fourth characteristic that the drop pipe length from the water heater to the bath is obtained by circulating the bath water to the pipe side.

[0006]

According to the first feature of the present invention, when the drop command is given to the bathtub, the hot water temperature of the hot water is firstly radiated while the hot water is sent from the water heater to the bathtub before the drop is started. The amount of decline can be predicted. Then, the temperature obtained by dropping the predicted decrease amount and adding it to the set temperature is set as the tap water temperature of the water heater, tapping is started, and tapping into the bathtub is started. Since hot water is discharged at a temperature that is calculated by dropping the predicted drop in hot water temperature and adding it to the set temperature, the hot water temperature when dropped into the bathtub almost falls to the set temperature, and subsequent reheating can be reduced or eliminated. it can. According to the second feature of the present invention described above, in addition to the action of the first feature, the relationship between the reheating time after the bathtub filling by dropping and the temperature rise of the bathtub is described for each reheating time. By obtaining the data as a data by a preliminary experiment and storing the data, the temperature increase amount required to bring the bathtub to the set temperature is selected from the data from the previous reheating time. By storing the hot water outlet set temperature of the water heater in the previous time, the hot water discharged from the water heater reaches the bathtub from the hot water outlet set temperature of the previous water heater and the temperature rise selected from the data. It is possible to calculate the amount of temperature decrease that has decreased. Therefore, at the time of dropping this time, by adding the previous hot water set temperature, the last reheating time, and the previous temperature decrease calculated from the data to the current hot water set temperature, It is set, and the tapping of hot water at that temperature is started. Further, according to the third feature of the present invention, in addition to the action of the first feature, for each combination of the drop pipe length from the water heater to the bathtub and the difference between the set temperature and the ambient temperature, The corresponding temperature drop is obtained in advance by experiments, and this is stored as data in the controller of the water heater, so that if the pipe length between the water heater and the bathtub that is currently installed is known, By obtaining the ambient temperature when a drop command is issued, the temperature drop is read from the ambient temperature and the pipe length that has been learned, and this is added to the current drop set temperature to determine the tapping temperature. After being set, tapping at that temperature is started. The fourth aspect of the present invention
According to the feature of (3), in addition to the function of the third feature, the drop pipe length from the water heater to the bathtub is obtained by circulating the bath water to the pipe side. Even if the pipe length up to the above cannot be measured, the temperature drop can be easily read.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of a bath apparatus with a water heater for explaining the method of the present invention, FIG. 2 is a flow chart showing an embodiment of the method of the present invention, and FIG. 3 is another embodiment of the method of the present invention. It is a flowchart showing.

In FIG. 1, 10 is a bathtub, and 20 is a bathtub with a water heater. A circulation path 30 is connected from the bathtub 10 to the reheating can body 21 of the bath kettle 20, and a circulation pump 22, a water flow switch 23 and the like are provided in the circulation passage 30 in the bath kettle 20.
24 is a water heater, and hot water discharged from the water heater 24 is sent to the circulation path 30 through an automatic hot water supply path 25 and a three-way valve 26. The automatic hot water supply passage 25 is provided with a drop water amount sensor 27 and a drop valve 28. 29 is a bypass with a check valve. Also, place the bath kettle 20 at an appropriate location in the bath kettle 20.
Atmosphere temperature sensor 40 for detecting the ambient temperature in the place where is installed is provided. Circulation path of the bathtub 10
An air introduction path 50 for a bubble bath is provided at the circulation port of 30. Reference numeral 60 denotes a controller which has a built-in microcomputer, inputs commands from the remote controller 70, inputs information from each sensor and each part of the device, and outputs a predetermined control command to each part of the device.

FIG. 1 shows a state in which the bathtub 10 and the bathtub 20 are located at a considerable distance from each other. When the reheating operation is performed, the three-way valve 26 makes the circulation path 30 a closed circuit,
The circulation pump 22 is driven and the bath water is circulated through the can body 21. Further, when the hot water discharged from the water heater 24 is dropped into the bathtub 10, the three-way valve 26 connects the automatic hot water supply passage 25 to the circulation path 30 so that the hot water discharged from the water heater 24 flows from the automatic hot water supply passage 25 to the circulation path 30. After that, it is dropped into bathtub 10. In the configuration of the bath device as described above, when the distance from the bathtub 10 to the bathtub 20 equipped with the water heater 24 is long, when the temperature for dropping into the bathtub 10 is set to the remote controller 70 or the like, the dropping is performed. If hot water having the same temperature as the set temperature was discharged by the water heater 24, the temperature would drop due to heat dissipation while being conveyed to the bathtub 10.

Then, the first method of adjusting the hot water discharge temperature of the water heater according to the present invention will be described below. The first method is
At the last drop, the hot water sent from the water heater 24 to the bathtub 10 from the additional heating time required to raise the temperature to the set temperature by the additional heating that is performed after the bath is filled with water. This is a method of predicting the decrease in the temperature of hot water. That is, when the heating capacity of the reheating can body 21 is the same, the reheating time is proportional to the amount of heat of heating, and therefore proportional to the rising temperature of the bath. Therefore, the relationship between the reheating time and the temperature rise due to it was obtained as data for each reheating time by a preliminary experiment, and it was actually dropped into the bathtub from the reheating time after dropping. It is possible to know how many times the temperature was lower than the drop setting temperature (tub setting temperature). Of course,
Since the outlet water temperature of the water heater 24 at that time is also known, it is possible to know the total temperature decrease of the outlet hot water in the end. Therefore, in the last drop,
From the hot water temperature by the water heater 24, the reheating time that followed the dropping, and the data of the reheating time and temperature that were stored in advance, the hot water was lowered before going to the bathtub 10. By calculating and storing the amount of temperature decrease, when the pouring temperature (bath set temperature) is set at the time of plunging this time, the pouring setting temperature is calculated and stored in the previous time. By setting the value obtained by adding the temperature decrease amount to the hot water outlet set temperature of the water heater 24, it is possible to drop the temperature into the bathtub in a manner predicting the temperature decrease in advance. In addition, at the time of the previous plunge, the set hot water temperature and the reheating time at that time are stored, and at the time of the current pouring, the preheating time and the temperature stored in advance are stored. The data may be used to calculate the temperature decrease amount of the hot water of the hot water at the previous time, and this may be set as the predicted temperature decrease at this time, and the predicted temperature decrease amount may be added to the current drop set temperature (tub set temperature). Further, in the case of a method of predicting the temperature decrease amount with the reheating time after dropping hot water, there is no residual water or the like in the bathtub 10, or since it is possible to adapt when there is little,
Normally, it is performed on the premise of a bath filling operation in which the bathtub 10 is dropped from an empty state.

According to the flow chart of FIG. 2, the above first
Explaining the specific operation of the method, when the remote controller 70 or the like commands the bath filling operation by dropping hot water (S1), the controller 60 causes the hot water supply stored at the time of filling water by the previous dropping. The hot water set temperature of the vessel 24 and the reheating time after the hot water filling are read out (S2), and the reheating time and the rising temperature data obtained in the previous experiment and stored correspond to the reheating time. The rising temperature (the temperature difference raised to the set temperature by reheating) is selected, and from this selected temperature and the hot water set temperature at the previous time, by the formula of (previous hot water set temperature-previous drop set temperature + temperature difference) Then, the amount of temperature decrease in which the hot water discharged last time has decreased until reaching the bathtub 10 is calculated (S3). Then, a value obtained by adding the calculated temperature decrease amount to the current drop set temperature (tub set temperature) is set as the hot water set temperature of the water heater 24 (S
4) Then, an instruction to start dropping is issued at the set hot water temperature (S5).

When the water is dropped to the predetermined water level set by the drop (S6), the controller 60 gives an instruction to end the drop and whether the bath temperature is lower than the drop set temperature (tub set temperature). (S7), and if less than (YES in S7), reheating is started (S8), reheating is performed until the bathtub set temperature is reached (S9), and reheating is ended (S10).
Then, the reheating time at this time and the hot water outlet set temperature of the hot water supply this time are stored.

Next, the second method of adjusting the hot water discharge temperature of the water heater according to the present invention will be described. This method is based on a preliminary experiment, for each combination of the drop pipe length from the water heater 24 to the bath 10 and the difference between the drop set temperature and the ambient temperature, the amount of temperature decrease until the hot water of the hot water reaches the bath 10. And get this as data controller
It is a method to memorize in 60. According to this second method, when the drop set temperature is set by the remote controller 70, first, the ambient temperature is detected and the difference between the drop set temperature and the ambient temperature is calculated, and the drop pipe length is set to the bath. By adopting the distance from the kettle 20 to the bathtub 10, the drop pipe length from the water heater 24 to the bathtub 10 and the difference between the drop set temperature and the ambient temperature are determined. Minutes can be selected and read. Therefore, by adding this temperature decrease amount to the current drop set temperature, the hot water outlet set temperature of the hot water heater 24 can be set.

The distance from the water heater 24 to the bathtub 10 can be obtained by actually measuring after the device is installed, but it may occur when it is impossible to actually measure. A method of circulating the bath water in the circulation path 30 can be adopted as a method for obtaining the distance even when such measurement is impossible. That is,
If the distance from the water heater 24 to the bathtub 10 is long,
Since the length of 30 is proportional to the distance from the bath kettle 20 to the bathtub 10, it is possible to predict the distance by obtaining the time required for circulation when the bathwater is circulated. In practice, the relationship between the time until the water flow switch 23 is turned on and the distance between the bathtub 10 and the bath kettle 20 is tested in advance by conducting a preliminary experiment by circulating the bathtub water in the circulation path 30 by driving the circulation pump 22. It is obtained as data by, and stored in the controller 60. With this, by obtaining the time until the water flow switch 23 is turned on by circulating the bath water after installing the apparatus, the distance from the bath pot 20 to the bath 10 can be obtained from the data.

According to the flow chart of FIG. 3, the second
Explaining the concrete operation of the method, when the bath drop command is given by the remote controller 70 or the like (YES in S21), the controller 60 first reads the stored pipe length of the drop, and The ambient temperature from the ambient temperature sensor 40 is input (S22), the difference between the drop set temperature and the ambient temperature is calculated (S23), and stored in advance from the calculated difference and the read pipe length. Based on the existing data, the decrease in the hot water temperature is selected (S
24), this is used as the predicted temperature decrease amount, and is set as the hot water outlet set temperature of the water heater 24 in addition to the current drop set temperature (S2
6). Then, the dropping is started (S26), and the operation is ended with the termination of the dropping (S27).

[0016]

According to the method of the present invention, it is possible to predict the amount of decrease in the hot water temperature due to heat radiation during the hot water is sent from the water heater to the bathtub.
Since the hot water having a temperature added to the set temperature is put out by the water heater, the temperature of the water drop into the bathtub is lower than the set temperature even if there is a distance between the bathtub and the water heater. It can be prevented from becoming too low. Therefore, the subsequent reheating operation can be omitted, or the operation time can be shortened and the operation time can be shortened. Further, according to the method of claim 2, in addition to the effect of the method of claim 1, the relationship between the time for reheating and the temperature rise of the bathtub,
For each reheating time, it is obtained as data by a preliminary experiment and stored, and the temperature decrease amount is calculated from the hot water outlet set temperature of the water heater at the time of the previous hot water filling, the reheating time, and the data. Therefore, it is possible to relatively accurately predict the current hot water discharge decrease from the previous hot water reheating time and the hot water hot water set temperature at the previous time, which is relatively close in time. Can be set. According to the method of claim 3,
In addition to the above effect of the method according to claim 1, a temperature decrease corresponding to each combination of the drop pipe length from the water heater to the bathtub and the difference between the set temperature and the ambient temperature is previously tested. The temperature of the hot water temperature drops due to the drop because the drop pipe length and the ambient temperature are obtained when the drop command is issued, as this is stored in the controller of the water heater as data. Minutes can be predicted, and an appropriate hot water outlet set temperature can be set accordingly. According to the method of claim 4, in addition to the effect of the method of claim 3, the drop pipe length from the water heater to the bathtub is obtained by circulating the bath water to the pipe side. As a result, even when the pipe length from the water heater to the bathtub cannot be measured, the temperature drop can be easily predicted.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a bath device with a water heater for explaining the method of the present invention.

FIG. 2 is a flowchart showing an embodiment of the method of the present invention.

FIG. 3 is a flow chart showing another embodiment of the method of the present invention.

[Explanation of symbols]

 10 Bathtub 20 Bath kettle with water heater 24 Water heater 30 Circulation path 40 Ambient temperature sensor

Claims (4)

[Claims] 1. A method for adjusting hot water discharged from a water heater from the water heater to the bath tub when the hot water discharged from the water heater is dropped into a bath tub where a drop temperature is set via a pipeline. A hot water temperature adjusting method for a bathtub drop, comprising predicting a decrease in hot water temperature due to heat radiation while being sent, and dropping the predicted decrease in hot water at a temperature added to a set temperature with a water heater. 2. The relationship between the reheating time after hot water filling and the temperature rise of the bathtub is obtained as data from a preliminary experiment for each reheating time and is stored, and the temperature decrease amount is The calculation is performed from the hot water outlet set temperature of the water heater, the reheating time, and the data when filling water.
The method for adjusting the temperature of discharged hot water for bathtub dropping as described in. 3. A temperature decrease corresponding to each combination of the length of the drop pipe from the water heater to the bath and the difference between the set temperature and the ambient temperature is obtained in advance by experiment and is used as data. The method for adjusting hot water supply temperature for bathtub temperature drop according to claim 1, which is stored in a controller of the water heater. 4. The hot water outlet temperature adjusting method for bathtub temperature dropping according to claim 3, wherein the drop pipe length from the water heater to the bathtub is obtained by circulating bath water to the pipe side.