JPH0518605A - Method of supply-hot-water temperature control in automatic supply-hot-water system - Google Patents

Abstract

PURPOSE:To raise the temperature of delivered hot water to a set temperature rapidly by determining the quantity of radiated heat in the piping from a heat exchanger to a supply hot water cock based on the temperature of the incoming water to a heat exchanger and adding a corrected quantity of heat that compensates for the quantity of radiation heat in a specified time from starting hot water delivery to the quantity of fuel consumption that is required to provide a set temperature. CONSTITUTION:Since, when a user opens a supply hot water cock 1, the signal of a flow rate sensor 8 generated by the flow rate is outputted to a microcomputer 23, this output is used as a flow rate detection signal. And, the quantity of radiation heat lost in a piping 24 from the outlet of a heat exchanger 4 to the supply hot water cock 1 is determined. Based on the quantity of radiation heat that is determined a corrected quantity of heat is calculated. Namely, the required quantity of consumed fuel is calculated according to the temperature of incoming water, flow rate given from the flow rate sensor 8, and set temperature set by a user, and a signal to give a gas proportional valve 9 the degree of valve opening that is suitable to provide a required quantity of consumed fuel is sent out through an action control section 22 and gas of a corresponding flow rate is supplied to a burner 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic hot water supply system for controlling the temperature of hot water discharged from a hot water tap such as a faucet or a shower so as to be as close as possible to a preset temperature set by a user, and to prevent fluctuations in season or outside temperature. The present invention also relates to an improvement in which the temperature of hot water that has begun to be discharged from a hot water tap is constantly and quickly reached to a set temperature.

[0002]

2. Description of the Related Art Recent automatic hot water supply systems require at least proportional control or proportional-integral control, depending on the case, in order to output hot water of a desired temperature from a hot water tap such as a faucet or a shower provided in a kitchen or a bathroom. Further, feedback control including proportional calculus control has led to considerably advanced control, and in addition to such a basic hot water supply function, a predetermined temperature up to a predetermined water level in the bathtub is maintained. It also has the function of automatically filling hot water and the function of reheating cold water as normal functions. However, it can be said that this has been realized by the use of microcomputers, which have been abundantly reduced in cost and increased in capacity these days. The present invention also forms part of such a pursuit of comfort, so first of all, a recent automatic hot water supply system itself will be described with reference to FIG. However, to describe in advance, since the present invention relates to hot water outlet temperature control from the hot water tap 1 such as a faucet or a shower, the function of automatically filling water in the bathtub 19 and the function of reheating hot water in the bathtub 19 are described. Will give a brief description, mainly by listing the components required for them.

The illustrated automatic hot water supply system has two heat exchangers 4 and 12 in the main body of the water heater, one of which is the heat exchanger 4 for hot water supply, which is connected via a pipe 24. If necessary, tap water is supplied from a hot water tap 1 such as a normal faucet or a shower installed at a position remote from the water heater main body portion, or when the switching solenoid valve 2 is switched, the bathtub 19 is also supplied via the pipe 24. Used to automatically fill hot water inside.
The other one is the heat exchanger 12 for additional heating when the hot water in the bathtub 19 does not reach the set temperature, or when it has cooled down with time.

Water from a water pipe is passed through the hot water heat exchanger 4 as indicated by an arrow "water" in the figure, and this water is used to burn the hot water heat exchanger 4 by a burner. The temperature is raised by heating at 5. Naturally, the burner 5 is supplied with fuel for combustion, but in the illustrated water heater, the most common gas is used as the fuel, as indicated by the arrow "gas". However, kerosene and other fuels may have almost the same structure as the hot water supply system, and if gas is read as such other fuels, the following description in this document can be applied as it is. The gas from the gas pipe goes through the original solenoid valve 13 and then the dedicated solenoid valve 1 on the hot water supply side.
After passing through 0, it is sent to the burner 5 via a solenoid valve (so-called gas proportional valve) 9 for gas flow rate adjustment. However, in some cases, the solenoid valve 10 dedicated to the hot water supply side may be omitted and the gas proportional valve 9 may be substituted. The burner 5 is also fed by the fan 6 with an appropriate amount of air at any given time.

On the other hand, the flow rate of water passing through the heat exchanger 4 is detected by a flow rate sensor 8, and the temperature of water before entering the heat exchanger 4 (inlet temperature) is detected by a feed water temperature sensor 7.
The hot water supply temperature sensor 3 detects the temperature of hot water discharged from the outlet of the heat exchanger 4 or the main body of the water heater.

In addition, although not shown, for safety, flame detection by a flame rod or the like for detecting whether or not the burner 5 is ignited in a predetermined manner for safety, or whether or not the burner 5 is burning. There may be provided a sensor, a high limit switch for detecting an abnormally high temperature of hot water discharged from the heat exchanger 4, and a fan as necessary for further improving controllability. A sensor or the like for detecting the flow rate of the air currently output by 6 or the actual rotation number of the fan motor and performing feedback control is also incorporated.

Next, the system including the heat exchanger 12 for additional heating will be described. The hot water in the bathtub 19 is guided from the inlet to the circulation passage, and this circulation passage is used for the heat exchanger 12 for additional heating.
After passing through the inside, it is connected to the outlet that opened again toward the bathtub 19. The heat exchanger 12 for additional heating is also selectively heated by the burner 16 similarly to the heat exchanger 12 for hot water supply described above.
3, the gas as fuel is selectively supplied to the reheating side through the dedicated solenoid valve 14, and the dedicated fan 17 also sends the air controlled to the optimum flow rate at that time. To be In addition, when heating the heat exchanger 12 for additional heating, the circulation pump 11 works, and the hot water in the bathtub 19 is circulated through the heat exchanger 12 while circulating. Further, the temperature of hot water in the bathtub to be reheated is detected by a bath temperature sensor 18 provided in the circulation flow path, and the water level in the bath 19 is detected by a water level sensor 15. Of course, although not shown, a flame rod or the like for detecting whether or not the burner 16 for additional heating has been ignited in a predetermined manner or whether the burner 16 is currently burning. A flame detection sensor is provided, and similarly, a high limit switch or the like for detecting the temperature of the reheating heat exchanger 12 when the temperature becomes abnormally high is also provided for the reheating heat exchanger 12, if necessary.

As described above, in the recent automatic hot water supply system of this type, a microcomputer (see FIG.
Medium, abbreviated as microcomputer; this abbreviation will be used below) 2
Operation of various operation switches attached to a remote controller (hereinafter, simply referred to as a remote controller) 40 provided separately from the detection signals from the various sensors and the main body of the control device 21 by the control device 21 including 3 The corresponding control is performed according to the signal based on. The remote controller 40 is used in the bathroom 3
It is usually installed in each of a plurality of places such as outside 0, kitchen or living room. Rather, the remote controller installed in the kitchen or the like becomes the main remote controller.

In any case, the remote controller used in the conventional automatic hot water supply system of the present invention has at least a temperature setting means capable of setting the temperature (set temperature K _S ) desired to be supplied by the user. In addition, an operation switch is provided in any one remote controller or all remote controllers. Further, among the plurality of remote controllers, the operation of the remote controller having a high priority with respect to the specific command information has priority over the other remote controller, and the existing setting information related to the same content commanded by the other remote controller or a new command is newly issued. Some have a so-called priority system in which the information that is saved is invalidated. Generally, each remote controller is also often provided with a microcomputer, and is connected to the control device 21 or the microcomputer 23 therein by a two-wire data transmission line for sending a signal by superimposing a signal on a power supply line. It is normal.

The above-mentioned operation switch is not a power switch in so-called various household electric appliances. Normal,
In this type of automatic hot water supply system, at the beginning of installation, power is supplied to the control device 21 by inserting the power plug of the system into a commercial AC power outlet, and thereafter,
Power will continue to be applied until the power is intentionally unplugged for repair or removal. The operation switch is used by the user to instruct whether or not combustion in the hot water supply burner 4 or the reheating burner 16 is permitted depending on the conditions, assuming that the system is powered on. As long as the user does not put the operation switch in the operation position (combustion position), the control device 21 controls the original solenoid valve 13 and the dedicated solenoid valves 10 for hot water supply and reheating through the operation controller 22. 14
Is kept closed so that the ignition operation does not occur in the first place. However, in view of the feeling of use by a general user, the operation switch is often described as a "power supply" switch.

However, when the user opens the hot water tap 1 such as a faucet or a shower with the operation switch (not shown) in the operating position, combustion for hot water supply automatically starts. That is, when the hot water tap 1 is opened and a water flow passing through the heat exchanger 4 is generated, the flow sensor 8 which has been issuing a water flow stop signal (zero flow rate signal) has started to flow water. Is sent to the microcomputer 23 (thus, the flow rate signal can also serve as a water flow on / off detection signal). Upon receiving this, the microcomputer 23 operates an ignition mechanism (not shown) (before that, of course,
Each solenoid valve 10, 13 is open), after starting combustion in the burner 5, after that, the incoming water temperature obtained from the feed water temperature sensor 7 and the current flow rate obtained from the flow sensor 8, and The operation control unit 22 calculates the required combustion amount according to the set temperature K _S set by the user.
A signal that gives an appropriate valve opening degree to the gas proportional valve 9 to obtain the required combustion amount is sent via the so that the gas of a corresponding flow rate is supplied to the burner 5. Further, an air amount adjustment signal (rotational speed control signal) is also sent to the fan 6 so that the burner 5 can be supplied with an appropriate amount of air for combustion. Further, the water (hot water) heated by the heat exchanger 4 is detected by the hot water supply temperature sensor 3 provided at the outlet of the heat exchanger 4,
If there is an error with the set temperature K _S set by the user, the microcomputer 23 causes the proportional valve 9 to eliminate such an error via the operation control unit 22.
Of the burner 5 by feedback control of the valve opening of the
Control the combustion energy at.

The user closes the hot water tap 1 from which hot water is being discharged,
When the hot water is stopped, the flow rate sensor 8 sends a water flow stop signal (zero flow rate signal) to the microcomputer 23, and the microcomputer 2 which receives this signal
In No. 3, a function of transmitting a fully closed signal to the gas proportional valve 9 via the operation control unit 22 to promptly extinguish the burner 5 is provided.
However, in some cases, in addition to the flow rate sensor 8 that outputs the actual flow rate in real time, a water flow switch that simply detects whether or not a water flow has occurred may be provided.
Even if the flow rate is not completely zero, when the flow rate drops below a predetermined flow rate, combustion may be stopped to prevent abnormal heating of the hot water temperature. For further safety, when the heat exchanger 4 is provided with a high limit switch, when it detects an overheated state up to an abnormal temperature and sends an overheat signal to the microcomputer 23, the microcomputer 23 controls the operation. When the burner 5 is immediately forced into the fire extinguishing operation or the combustion amount is limited, similarly, although not shown, an appropriate combustion detection element such as a flame rod detects a mid-fire in the burner 5. Also,
The microcomputer 23 causes the operation control unit 22 to send a forced closing signal to the gas proportional valve 9, and depending on the system, the original solenoid valve 1
A compulsory closing signal is also sent to 3 to prevent the risk of raw fuel leaking out of the machine.

A water filling command switch (not shown)
When the automatic filling of the inside of the bathtub 19 is selected by operating the, the filling request signal is sent to the microcomputer 23 built in the control device 21, and the microcomputer 23 operates the operation control unit 22 accordingly. The switching solenoid valve 2 is opened via this so that the hot water from the heat exchanger 4 can be directly introduced into the bathtub 19. However, the invention of the present application is not related to such an automatic filling mechanism itself, and therefore a description thereof will be omitted. Similarly, when the actual hot water temperature in the bathtub 19 does not reach the set temperature after the completion of the automatic filling, or when the user operates the reheating command by himself, the microcomputer 23 causes the circulation pump 1 to operate.
While giving a command to start turning 1, the operation control unit 22 in the control device 21 is ignited to ignite the burner 16 for additional heating,
The heating heat exchanger 12 heats the hot water in the bathtub 19. However, this is also not directly related to the present application, and the description thereof will be omitted. In other words, the invention of the present application can be improved at least as long as it is an automatic hot water supply system having the basic hot water supply function described above. However, regarding the above-mentioned automatic filling, the part for controlling the pouring temperature is also the object of the improvement according to the present invention.

[0014]

Even in the conventional case, when the hot water supply from the hot water tap 1 is stable, and again, the hot water supply temperature K detected by the hot water supply temperature sensor 3 provided at the outlet of the heat exchanger 4 is detected. If it is _O , it can approach the set temperature K _S set by the user well. However, considering the transitional period until that time, or from the outlet of the heat exchanger 4 to the place where the hot water tap 1 is provided, or from the outlet of the heat exchanger 4 to the place where the pouring port to the bathtub 19 is provided. In view of the existence of the pipe 24, there are still various problems. In order to explain this, the outlet temperature of the heat exchanger 4 (the temperature detected by the hot water temperature sensor 3) K _O when controlled by the combustion control method in the conventional automatic hot water supply system, and the actual output from the hot water tap 1 Hot water temperature K
_A typical relationship with _n is often as shown in FIG. When the user opens the hot water tap 1 again when the automatic hot water supply system is used for the first time or after a long time has passed since the last time the hot water was used and the pipe 24 is completely cooled, the combustion is initially performed. The amount is set to a large amount in consideration of a certain fixed correction value (feedforward amount FF _C ), and as a result, the outlet heated water temperature K _{O at} the outlet of the heat exchanger 4 is set to exceed the set temperature K _S for a certain period of time. To indicate a large overshoot. This is to promptly warm the pipe 24 in consideration of the fact that it is cold. However, in the conventional such feedforward control, to the combustion amount required to obtain the set temperature, the correction value FF _C applied was always constant. Therefore, it is not possible to cope with seasonal changes.
Since No. 4 quickly warms up to near the set temperature K _S , even if the hot water outlet temperature K _n from the hot water tap 1 reaches the set temperature K _S relatively quickly, the pipe 24 that has been completely cooled in the winter season does not easily warm up. Therefore, the temperature of the hot water discharged from the hot water tap 1 also becomes considerably long as indicated by the reference symbol K _n 'in FIG. The present invention has been made for the purpose of improving this point, and is intended to bring the hot water outlet temperature K _n from the hot water tap 1 closer to the set temperature K _S in the summer or winter, that is, as quickly as possible throughout the year. .

[0015]

In order to solve the above problems, the present invention determines the amount of heat radiation in the pipe from the outlet of the heat exchanger to the hot water tap based on the temperature of the water entering the heat exchanger, and , A predetermined time from the start of hot water is set as the correction time, and until the correction time elapses, the correction heat quantity for supplementing the heat radiation quantity determined above is added to the required combustion quantity to obtain the set temperature, and this is added. Combustion in the heat exchanger is controlled so that the total amount of combustion can be obtained in the heat exchanger. In the above, the detection of the incoming water temperature is, so to speak, to obtain the material for judging the season. Therefore, instead of this incoming water temperature, the outside air temperature detected by the outside air temperature detection sensor and the bathroom inside detected by the temperature sensor in the bathroom The temperature, the pipe temperature detected by the pipe temperature sensor, and the like can also be used. Further, regarding the correction time as well, the length can be determined based on the incoming water temperature, and in place of this, the other information described above can be used to determine the length. Further, the present invention also proposes, as one aspect thereof, a method of dividing the correction time into a plurality of time portions and determining the value of the correction heat quantity for each correction time portion. In this case, the corrected amount of heat determined corresponding to the time portion is set to be larger as the time portion is earlier from the start of hot water discharge.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hot water supply temperature control method according to the present invention will be described below with reference to FIGS. 1 to 3. As a premise therefor, a combustion control system or automatic hot water supply as hardware to which the present invention can be applied. The system itself is assumed to have already been described with reference to FIG. Therefore, in this section, re-explanation of the entire system will be omitted, and what is necessary for realizing the present invention will be appropriately extracted and incorporated from the already-described contents. The same applies to the reference numerals in FIG. In other words, in other words, as long as the automatic hot water supply system of recent years has a normal function, the present invention can be realized by a software process for a microcomputer incorporated therein.

First, an outline of a hot water supply temperature control method according to the present invention will be described with reference to FIG. When the user opens the hot water tap 1 while the automatic hot water supply system as shown in FIG. 4 is in the operation mode (on mode), the flow rate sensor 8 outputs a signal indicating that the flow rate has been generated to the microcomputer 23. Since it comes, it is used as a flow rate detection signal in this control method, and it is checked in the next judgment step whether or not the correction calculation is completed. Since it is not finished here, the process proceeds to the next step, and the amount of heat radiation lost in the pipe 24 from the outlet of the heat exchanger 4 (in the main body of the water heater) to the hot water tap 1 is determined. In determining the amount of heat radiation, the incoming water temperature obtained from the water supply temperature sensor 7 can be used as a criterion. For example, the water temperature is high in the summer and low in the winter, so conversely, the current season can be estimated from such water temperature information. On the other hand, the coldness of the piping for each season can be empirically determined. Since it is known, it is possible to determine the amount of heat dissipation that will eventually be lost in the pipe 24 at each incoming water temperature.

Next, based on the heat radiation amount thus determined,
Calculate the corrected heat. The corrected calorific value has the following meaning. Even in the conventional automatic hot water supply system to which the present invention is not applied, the required amount of combustion is determined according to the incoming water temperature at that time, the current flow rate obtained from the flow rate sensor 8, and the set temperature K _S set by the user. A signal that gives an appropriate valve opening to obtain the required combustion amount is sent to the gas proportional valve 9 via the operation control unit 22 to supply a corresponding flow rate of gas to the burner 5. , Fan 6
Also, an air amount adjustment signal (rotational speed control signal) is sent out to supply the burner 5 with an appropriate amount of air for combustion.
Further, immediately after the start of the hot water discharge, in order to improve the rising characteristics of the hot water discharge temperature, feedforward control is performed and a certain amount of corrected heat is added to the above required combustion amount. The correction calorie in the present invention is also as described above.
In addition to the required combustion amount, it is similar to the above-mentioned conventional feedforward control. However, the big difference is that, as described above, the correction heat quantity in the present invention is determined based on the heat radiation quantity in the pipe 24, and therefore it is not always a fixed constant value, but is changed by the seasonal variation. It is a changing point.

In this way, if the correction heat quantity for compensating the heat radiation quantity expected in the pipe 24 is calculated, then,
As shown in FIG. 1, the correction time is calculated from the hot water supply stop time. Here, the hot water supply stop time is the time during which combustion for hot water supply has not been performed until the current hot water supply is started. Therefore, the longer this time is, the cooler the pipe 24 is. However, if the hot water supply stop time is equal to or longer than a certain time value, the pipe 24 will not be cooled any more. Therefore, the time until the hot water supply stop time can be defined as the maximum hot water supply stop time, for example, 5 minutes. Can be determined. Therefore, if there is no combustion for hot water supply for 5 minutes or more, the hot water supply stop time is 5
In this way, when the hot water supply is used for the first time after the automatic hot water supply system incorporating the control function of the present invention is installed, the hot water supply stop time can be treated as 5 minutes.

On the other hand, the correction time is defined, for example, in advance by design, with respect to the time from the minimum value of hot water supply stop time (generally, zero may be set to an extremely short time) to the maximum value. It is obtained as a time having a linear functional relationship by the obtained proportional coefficient, and is for adding the calculated calorific value to the required combustion amount only during that time. For example, when no time has passed since the last time the hot water was used, as described above, the heat radiation amount in the pipe 24 is calculated according to the incoming water temperature at that time, and this is simply added to the above required combustion amount. Then, rather, the amount of heat may be excessive. This is because, as described above, the corrected heat amount is calculated on the assumption that the pipe 24 is completely cooled (that is, the maximum hot water supply stop time or more has elapsed). On the other hand, as described above, if the correction time is also changed and controlled in consideration of the hot water supply stop time, such a fear can be eliminated or suggested.

When the correction calculation is completed in this way, as shown in FIG. 1, for example, with respect to the set temperature K _S at that time,
Temperature K _O to which temperature K _CMP corresponding to the corrected heat quantity is added
Is the target temperature detected by the hot water supply temperature sensor 3 at the outlet of the heat exchanger 4, and the combustion amount in the heat exchanger 4 is determined and controlled by the existing mechanism described above.

A more specific embodiment of the above-described embodiment of the basic hot water temperature control according to the present invention will be described below. First, the input water temperature data K _C is fetched from the water supply temperature sensor 7 at predetermined time intervals (for example, 10 seconds) after at least a predetermined time (for example, 5 seconds) has elapsed since the hot water supply was started. Then, the incoming water temperature data previously fetched is averaged n times to obtain new incoming water temperature data. That is, if the average incoming water temperature data is K _CAV , then (K _C + nK _CAV ) / (n + 1) = K _CAV . A suitable value for n is, for example, about 10.

Further, the average of K _CAV obtained above and K _CAV-1 obtained at the previous combustion is used as the previous data at the next combustion. That is, (K _CAV + mK _CAV-1 ) / (m + 1) = K _CAV-1 . Here, it is suitable that the value of m is about 50, for example.

Next, in consideration of the actual situation, when the incoming water temperature is 30 ° C. or higher, no correction is required, and the incoming water temperature of 30 ° C. or higher is clamped to the maximum incoming water temperature of 30 ° C. On the contrary, the temperature below 0 ° C is set to 0 ° C. Further, as described above, if the hot water supply stop time (non-combustion time) T _P from the previous combustion time to the current combustion time is 5 minutes or more, it is set to 5 minutes.

Here, the hot water supply stop time is 5 minutes or more,
For example, 300 Kcal is assumed as the maximum feedforward amount (corrected heat amount) FF _CMP when the incoming water temperature is 0 ° C. or lower, that is, when the largest correction is required (of course, this value is changed in consideration of the heat capacity of the model). ). Then, as shown in FIG. 2 (A), when the incoming water temperature is 30 ° C. or higher and the hot water supply stop time is considered to be zero or almost zero, that is, the feedforward amount (corrected heat amount) FF _CMP the value FF _CMP = 30 when but a good origin at zero, which as described above (T _P / K _CAV) is maximum
For example, a linear relationship (which is not limited but this is simple and is sufficient) is provided between 0 and 0, and the feedforward amount FF _CMP required at each time is calculated accordingly. However, when K _CAV is zero,
(T _P / K _CAV ) is _treated as the maximum value.

Next, a correction time T _CMP is obtained based on the _incoming water temperature data K _CAV and the hot water supply stop time T _P. But not limited to be about this, easily can set the linear relationship between (T _P / K _CAV) as shown in FIG. 2 (B), up to about 20 seconds In this range, the optimum correction time can be obtained each time.

Further, in this embodiment, the correction time obtained above is further divided into q steps, aiming for more precise control. Then, the above-mentioned corrected calorific value is determined to be appropriate as a calorific value that gradually decreases at each time step (each partial time).
That is, as shown in FIG. 2 (C), the first (T
_CMP / q) time is calculated by adding the feedforward amount FF _CMP calculated above to the required combustion amount for the set temperature K _S , and during the next (T _CMP / q) time, {FF _CMP (q-1) /
q} is added. Similarly, the correction time T _CMP is completed.

According to such a method, the result as shown in FIG. 3 is obtained. That is, as shown in FIG. 3 (A), at the outlet of the heat exchanger 4, the summer target temperature K
_O is not much higher than the set temperature K _S at maximum,
Although the correction time is short, the target temperature K _O 'is relatively high in the winter and the correction time is long. As a result of such a relationship, as shown in FIG. 3 (B), the outlet heated water temperature at the outlet of the heat exchanger 4 is higher than that of the summer discharged water temperature K _{O in} the winter heated water temperature K _O ′. As a result, the outlet heated water temperature K _n actually supplied to the user at the portion of the hot water tap 1 after passing through the pipe 24 has a substantially constant convergence time throughout the year, and more quickly,
The set temperature K _S can be reached.

Although the preferred embodiments of the present invention have been described above, various modifications are conceivable without departing from the gist of the present invention. For example, the heat radiation amount in the pipe may be determined based on the outside air temperature detected by the outside air temperature detection sensor 20 as shown by the temperature sensor 20 in FIG. When the temperature sensor 20 is provided in the bathroom 30, it is possible to determine the season by the temperature in the bathroom detected by the temperature sensor 20. Further, the temperature sensor 20 may directly detect the temperature of the pipe 24 to determine the season based on the pipe temperature, and based on this, determine the heat radiation amount in the pipe 24.

The same applies to the calculation of the correction time,
In the above embodiment, it is based on the incoming water temperature (in the preferred embodiment, it is also based on the hot water supply stop time), but instead of the incoming water temperature, the above outside air temperature, bathroom temperature, or pipe temperature, etc. may be adopted. You can

Also, in the case of the embodiment in which the correction time is divided into q steps, the value itself of q is not necessarily equal division, in addition to being arbitrarily designed. Naturally, the correction heat quantity for each time portion may not be the heat quantity change in the equal interval step.

[0032] Also for additional compensation amount of heat for the required combustion quantity which is calculated to obtain a set temperature K _S, as shown in the embodiment of FIG. 1, the actually set temperature K _S itself The target temperature K _O = K _S + K _CMP may be equivalently set to a high value, or the input water temperature K _C may be set to a pseudo low value or the flow rate passing through the heat exchanger 4 may be changed. It may be equivalently set by setting a pseudo large amount.

Further, the length of the pipe 24 varies depending on the installation location, but since it is known at least before operating the system, the length of the pipe 24 can be increased by providing an appropriate changeover switch or a selection switch. If the temperature can be given to the microcomputer 23, this information can be used to determine the heat radiation amount in the pipe 24, and more accurate tapping temperature control can be performed.

Of course, the present invention can be adopted as long as it is an automatic hot water supply system having only a hot water supply function, and does not necessarily have a function of filling water in the bathtub 19 or a function of reheating. However, in the case of having a water filling function, since heat is expected to be radiated there from the pipe 24 extending from the heat exchanger 4 to the pouring port portion to the bathtub 19, the present application is intended to compensate for this heat radiation amount. The invention can be effectively used.

[0035]

EFFECTS OF THE INVENTION According to the present invention, by taking into consideration the heat radiation in the piping portion which has not been neglected so far, the hot water outlet temperature can be promptly set regardless of the season after the hot water is started from the hot water tap. It can be taken up to and can provide a comfortable feeling.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a basic embodiment according to a tapping temperature control method of the present invention.

FIG. 2 is an explanatory diagram for obtaining a correction heat amount and a correction time in another specific example according to the tapping temperature control method of the present invention.

FIG. 3 is an explanatory diagram of an effect of the present invention.

FIG. 4 is a schematic configuration diagram of an example of an automatic hot water supply system that can be used in the present invention.

FIG. 5 is an explanatory diagram showing that, conventionally, the time required for the temperature of hot water discharged from the hot water tap to reach the set temperature is different between winter and summer.

[Explanation of symbols]

1 Hot water tap 2 switching solenoid valve 3 Hot water temperature sensor 4 Hot water heat exchanger 5 burners 6 fans 7 Water temperature sensor 8 Flow rate sensor 9 proportional valve 10 Solenoid valve for hot water supply side 20 temperature sensor 21 Control device 22 Motion control unit 23 Microcomputer 24 Piping from heat exchanger outlet to hot water tap or pouring spout

Claims (13)

[Claims] 1. A water inlet temperature to the heat exchanger, a hot water outlet temperature from the heat exchanger, and the heat exchanger so that the hot water outlet temperature at the outlet of the heat exchanger provided in the water heater main body approaches a preset temperature. In an automatic hot water supply system that calculates a required amount of combustion based on the flow rate passing through the heat exchanger and controls combustion in the heat exchanger so as to obtain the required amount of combustion; based on the temperature of water entering the heat exchanger, Determine the amount of heat radiated in the pipe from the outlet of the heat exchanger to the hot-water tap provided at a position away from the water heater body; a predetermined time from the start of hot water is set as the correction time, and the correction time elapses. Until, the correction heat quantity for compensating the determined heat radiation quantity is added to the required combustion quantity for obtaining the set temperature; and the combustion is controlled in the heat exchanger so as to obtain the additionally corrected combustion quantity. To do Hot water supply temperature control method for automatic hot water supply system. 2. The hot water supply temperature control method for an automatic hot water supply system according to claim 1, wherein the hot water supply tap is supplied from the outlet of the heat exchanger based on an outside air temperature detected by an outside air temperature detection sensor instead of the incoming water temperature. Determining the amount of heat dissipation in the piping up to. 3. A method for controlling hot water supply temperature in an automatic hot water supply system according to claim 1, wherein the temperature of the bathroom is detected by an internal temperature sensor of the bathroom instead of the temperature of the incoming water, and the temperature is changed from the outlet of the heat exchanger. Determining the amount of heat radiation in the piping to the hot water tap. 4. The hot water supply temperature control method for an automatic hot water supply system according to claim 1, wherein hot water is supplied from the outlet of the heat exchanger based on the temperature of the pipe detected by a pipe temperature sensor instead of the water inlet temperature. Determining the amount of heat radiation in the piping to the stopper. 5. A method for controlling a hot water supply temperature in an automatic hot water supply system according to claim 1, wherein the correction time is also determined based on the incoming water temperature. 6. The hot water supply temperature control method for an automatic hot water supply system according to claim 5, wherein the correction time is determined based on the outside air temperature detected by an outside air temperature detection sensor instead of the water inlet temperature. A method characterized by. 7. The hot water supply temperature control method for an automatic hot water supply system according to claim 5, wherein the correction time is determined based on the temperature in the bathroom detected by a temperature sensor in the bathroom instead of the inflow water temperature. A method characterized by 8. The method for controlling hot water supply temperature in an automatic hot water supply system according to claim 5, wherein the correction time is determined based on the temperature of the pipe detected by a pipe temperature sensor instead of the water inlet temperature. A method characterized by: 9. A hot water supply temperature control method in an automatic hot water supply system according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the correction time is divided into a plurality of time portions.
The value of the correction heat quantity is determined for each correction time portion,
The earlier the time point from the start of the hot water, the larger the corrected calorie value determined in the time point is;
A method characterized by. 10. Claims 1, 2, 3, 4, 5, 6, 7,
A method for controlling a hot water supply temperature in an automatic hot water supply system according to 8 or 9, wherein the correction heat quantity is added to the required combustion quantity by setting the set temperature for obtaining the required combustion quantity to be pseudo high. Be done equivalently;
A method characterized by. 11. Claims 1, 2, 3, 4, 5, 6, 7,
8. A hot water supply temperature control method for an automatic hot water supply system according to 8 or 9, wherein the correction heat quantity is added to the required combustion quantity by setting the upper entry water temperature to be pseudo low to obtain the required combustion quantity. Is equivalently done with;
A method characterized by. 12. The method according to claim 1, 2, 3, 4, 5, 6, 7,
The hot water supply temperature control method in the automatic hot water supply system according to 8 or 9, wherein the addition of the correction heat quantity to the necessary combustion quantity is equivalent to setting the flow rate for obtaining the necessary combustion quantity to a pseudo high value. What is done; 13. The method according to claim 1, 2, 3, 4, 5, 6, 7,
8. A hot water supply temperature control method in an automatic hot water supply system according to 8, 9, 10, 11 or 12, wherein the heat radiation amount in the pipe is determined based on a known length of the pipe. how to.