JP2002162101A - Hot water supplying apparatus with reheating of bathtub water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply apparatus capable of precisely controlling temperature of hot water, with which a bathtub is filled, through simple processing, in a one- can two-aqueduct type hot water supply apparatus with reheating of bathtub water. SOLUTION: A controller 4 executed reheating of bathtub water heated by a reheating of bathtub water heat-exchanger 7 through circulation of hot water, stored in a bathtub 4, through a reheating of bathtub water line 3, hot water supply operation to supply hot water heated by heating water, flowing through a hot water supply line 2, by a hot water supply heat exchanger 8, and hot water filling operation to supply hot water in a bathtub through a hot water filling relay pipe 30 and a reheating of bathtub water line 3. The controller 4 decides combustion amounts of a first burner 5 and a second burner 6 during hot water filling operation by using heat exchanger data corresponding to a case in which hot water supply operation and reheating of bathtub water operation are simultaneously executed, and controls the temperature of hot water with which a bathtub 4 is filled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to hot water filling control in a so-called one-can, two-channel water heater with reheating in which a part of a heat exchanger for hot water supply and a part of a heat exchanger for reheating are overlapped.

[0002]

2. Description of the Related Art In recent years, for the purpose of saving space, a so-called one-can-two-channel water heater with reheating has been developed in which a part of a heat exchanger for hot water supply and a part of a heat exchanger for reheating are overlapped. I have. In such a water heater, one end is connected to the water supply, and the water supplied from the water supply is heated by the hot water supply heat exchanger to supply the hot water from the other end, and both ends are connected to the bathtub, and the bathtub is connected to the bathtub. And a reheating pipe line for circulating the hot water retained in the tank while being heated by the reheating heat exchanger.

[0003] When hot water is supplied, the amount of heating of the hot water supply heat exchanger is determined so that the temperature of hot water supplied from the hot water supply pipe reaches a predetermined target temperature, and feedforward control is performed. Further, a hot water supply temperature sensor for detecting the temperature of hot water supplied from the hot water supply pipe is provided, and the heating amount is further finely adjusted by feedback control so that the detected temperature of the hot water supply temperature sensor matches the target hot water supply temperature.

In such a water heater with reheating, a hot water relay pipe for communicating the hot water supply line with the reheating line is provided.
There has been proposed a water heater in which hot water is supplied to a bathtub from a hot water supply pipe via the hot water supply relay pipe and the additional heating pipe.

[0005] In the case where the filling is performed using the supplementary heating pipe as described above, the first filling path to the bathtub via the side of the supplementary heating pipe that is heated by the supplementary heating heat exchanger, and the supplementary heating. In general, hot water is supplied from a hot water supply pipe to a bath tub by so-called both conveyances through two paths, that is, a second filling path to a bath tub via a side not heated by the additional heating heat exchanger of the heating pipe. It is a target.

However, when filling is performed by both transports,
On the side of the second hot water supply path, hot water of the target temperature supplied from the hot water supply pipe is directly supplied to the bathtub, but on the first hot water supply path side, the hot water of the target temperature supplied from the hot water supply pipe is additionally heated. The temperature is further increased by the heat exchanger and supplied to the bathtub.

Therefore, when feedback control is performed so that the temperature of the hot water supplied from the hot water supply pipe reaches the target temperature as in the case of performing normal (other than hot water) hot water supply, the hot water stored in the bathtub is not controlled. There is a disadvantage that the temperature becomes higher than the target temperature. Therefore, conventionally, when performing hot water filling, the feedback control is prohibited, the hot water supply temperature is controlled only by the feed forward control, and the amount of heating by the hot water supply heat exchanger is reduced in consideration of the amount of heating in the additional heating heat exchanger. Was like that.

However, in this case, it is difficult to determine how much the amount of heating is to be reduced, and it is difficult to control the filling temperature of the bath with high accuracy.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned background, and has been made in consideration of the above background. It is an object to provide a water heater that can be controlled.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and a refire line for circulating hot and cold water retained in the bathtub at both ends to reheat the pipes. And a hot water supply pipe for heating water supplied from the water supply at one end and supplying hot water from the other end, and a reheating heat exchanger for heating hot water flowing through the reheating pipe,
A hot water supply heat exchanger that partially heats the water flowing through the hot water supply line overlapping with the additional heating heat exchanger, a heating unit that heats the additional heating heat exchanger and the hot water supply heat exchanger, The present invention relates to a water heater provided with a heating amount adjusting means for adjusting a heating amount of the heating means.

First, according to a first aspect of the present invention, of the heat generated by the heating means when the hot water supply and the additional heating are simultaneously performed, the heating of the water by the hot water supply heat exchanger and the additional heating The first thermal efficiency data, which is the ratio of the amount of heat actually used for the hot water supply, and the heating of the water by the hot water supply heat exchanger out of the heat generated by the heating means when only the hot water supply is performed alone A heat efficiency data storage means for storing data of a second heat efficiency which is a ratio of a heat amount actually used, and the heating means by the heating amount adjusting means so that hot water of a predetermined temperature is supplied from the hot water supply pipe. When the additional heating and the hot water supply are simultaneously performed, the heating amount of the heating means is determined based on the data of the first thermal efficiency.
The present invention relates to an improvement of a hot water supply unit with additional heating provided with hot water supply control means for determining a heating amount of the heating means based on data on thermal efficiency.

[0012] Then, the downstream side of the portion of the hot water supply pipe where water is heated by the hot water supply heat exchanger communicates with the additional heating pipe line, and the hot water heated and generated by the hot water supply heat exchanger is converted into the hot water. A first hot water supply path to be supplied from the hot water supply pipe to the bathtub through the additional heat pipe on a side heated by the additional heat exchanger, and heating from the hot water supply pipe by the additional heat exchanger; A hot water supply pipe for forming a second hot water supply path to be supplied to the bathtub via the additional heating pipe line on the side not to be heated, wherein the hot water supply control means includes the first hot water supply path and the second hot water supply pipe; When hot water is supplied from the hot water supply pipe line to the bathtub via a tension path, a heating amount of the heating means is determined based on the first thermal efficiency.

In the present invention, the thermal efficiency storage means stores the first thermal efficiency data according to the case where the hot water supply and the additional heating are simultaneously performed, and the second thermal efficiency data according to the case where only the hot water supply is performed alone. Thermal efficiency data is stored. The situation in which hot water is supplied from the hot water supply pipe to the bathtub via the first hot water supply path and the second hot water supply path is that water flowing in the hot water supply pipe is heated by the hot water supply heat exchanger. In addition, in that the hot water flowing through the additional heating pipeline is heated by the additional heating heat exchanger,
This is common to the situation where hot water supply and reheating are performed simultaneously.

Therefore, when hot water is supplied from the hot water supply pipe line to the bathtub through the first and second filling paths, the heating means is heated based on the first thermal efficiency data. By determining the amount, the hot water supply control means can accurately control the temperature of the hot water supplied to the bathtub. In this case, there is no need to perform a complicated process for correcting the heating amount of the heating unit.

Next, according to a second aspect of the present invention, when the hot water supply and the additional heating are simultaneously performed, the water supplied by the heating means and heated by the hot water supply heat exchanger and the additional heating by the additional heat exchanger are provided. Data of the first heat quantity used for heating the hot water and data of the second heat quantity given by the heating means and used for heating the water by the hot water supply heat exchanger when only the hot water supply is performed alone. When the heating amount of the heating unit is controlled by the heating amount adjusting unit so that hot water of a predetermined temperature is supplied from the hot water supply line, and the additional heating and the hot water supply are simultaneously performed. Determines a heating amount of the heating unit based on the first heat amount, and determines a heating amount of the heating unit based on the second heating amount when only hot water supply is performed alone. Of water heater with fire About the good.

[0016] Then, the downstream side of the portion of the hot water supply pipe where water is heated by the hot water supply heat exchanger communicates with the additional heating pipe line, and the hot water heated and generated by the hot water supply heat exchanger is converted into the hot water. A first hot water supply path to be supplied from the hot water supply pipe to the bathtub through the additional heat pipe on a side heated by the additional heat exchanger, and heating from the hot water supply pipe by the additional heat exchanger; Forming a second filling path to be supplied to the bathtub through the additional heating pipe on the side not to be heated, wherein the hot water supply control means is provided via the first filling path and the second filling path; When hot water is supplied from the hot water supply pipe to the bathtub, a heating amount of the heating means is determined based on the data of the first heat amount.

In the present invention, the heating amount data storage means stores the first heat amount data corresponding to the case where the hot water supply and the additional heating are simultaneously performed, and the heat amount data corresponding to the case where the hot water supply alone is performed alone. The data of the second heat quantity is stored. As described above, the situation in which hot water is supplied from the hot water supply pipe to the bath tub via the first hot water supply path and the second hot water supply path is caused by the hot water supply heat exchanger. This is common to the situation in which hot water supply and reheating are performed simultaneously, in that the water flowing through the reheating tank is heated and the hot water flowing in the reheating pipe is heated by the reheating heat exchanger.

[0018] Therefore, when hot water is supplied from the hot water supply pipe to the bathtub via the first and second filling paths, the heating means is controlled based on the first calorie data. By determining the heating amount, the hot water supply control means can accurately control the temperature of the hot water supplied to the bathtub.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of a water heater with additional heating of the present invention, and FIG. 2 is a control block diagram of the water heater with additional heating shown in FIG.

Referring to FIG. 1, water heater 1 includes hot water supply line 2
Is connected to a water pipe (not shown) by
Is connected to the bathtub 4. And the water heater 1
A function of heating water supplied from the water pipe through the hot water supply pipe line 2 to a predetermined temperature to supply hot water, a function of heating hot water stored in the bathtub 4 to reheat the water, and a function of supplying hot water of a predetermined temperature to the bathtub 4. It has a hot water filling function to store a fixed amount.

The overall operation of the water heater 1 is controlled by a controller 4 and a first burner 5 (corresponding to a heating means of the present invention) which operates according to a control signal from the controller 4.
And a second burner 6 having a lower heating capacity than the first burner.
(Corresponding to the heating means of the present invention), the first burner 5 and the second burner
The reheated heat exchanger 7 and the hot water supply heat exchanger 8 heated by the burner 6, and a part of the water supplied from the water pipe to the hot water supply pipe line 2 are bypassed by the hot water supply heat exchanger 8 and the hot water supply heat exchanger 8 is provided. Pipe 9 mixed with the hot water discharged from the hot water, a bypass servo 10 for adjusting the degree of opening of the bypass pipe 9 by a control signal from the controller 4, hot water downstream of the junction X between the hot water supply line 2 and the bypass pipe 9. Hot water thermistor 11 that detects the temperature of the hot water and outputs a detection signal to the controller 4; a heat exchange thermistor 12 that detects the temperature of hot water near the outlet of the hot water supply heat exchanger 8 and outputs the detection signal to the controller 4; A water supply flow rate sensor 13 that detects a flow rate of water supplied to the pipe 2 and outputs a detection signal to the controller 4, and a water quantity servo 14 that adjusts a flow rate of hot water supplied from the hot water supply pipe 2.
Is provided.

Further, the hot water supply device 1 comprises a hot water supply relay pipe 30 for connecting the hot water supply pipe line 2 and the additional heating pipe line 3, and a controller 4.
Pouring solenoid valve 15 which operates in response to a control signal from and opens and closes filling pipe 30,
Check valve 1 that disables the passage of hot water in the direction to 0 and enables the passage of hot water in the direction from the filling line 30 to the reheating line 3.
6. A pump 17 which operates in response to a control signal from the controller 4 to circulate the hot water stored in the bathtub 4 into the additional heating pipe 3, the temperature of the hot water supplied from the bathtub 4 to the additional heating pipe 3 (= bathtub) A bath thermistor 18 for detecting the temperature of the hot water stored in the tank and outputting a detection signal to the controller 4, and a bath water flow switch for detecting the presence or absence of hot water flowing in the additional heating pipe 3 and outputting the detection signal to the controller 4. 19. A hot water quantity sensor 20 for detecting a flow rate of hot water supplied from the hot water supply pipe 2 to the bathtub 4 via the hot water relay pipe 30 and the additional heating pipe 3 and outputting a detection signal to the controller 4.

The water heater 1 supplies fuel gas to the first burner 5 and the second burner 6 in response to a control signal from the controller 4 in order to control the operation of the first burner 5 and the second burner 6. Original gas solenoid valve 21 for switching between the cutoff and the shutoff, a gas proportional valve 22 for adjusting the supply flow rate of the fuel gas according to a control signal from the controller 4, and a fuel gas to the first burner 5 according to a control signal from the controller 4. A first gas solenoid valve 23 for switching between supply and cutoff of fuel, a second gas solenoid valve 24 for switching between supply and cutoff of fuel gas to the second burner 6 in response to a control signal from the controller 4, and control from the controller 4. A combustion fan 25 for supplying combustion air to the first burner 5 and the second burner 6 in response to a signal, and a spark discharge by a high voltage applied from an igniter 26 in response to a control signal from the controller 4. Spark plug 27 occurs, a detection signal by detecting the presence or absence of combustion flame in the second burner 6 controller 4
And a water pipe thermistor 29 that detects the temperature of water in the hot water supply pipe 2 where the temperature is the highest in the hot water supply heat exchanger 8 and outputs a detection signal to the controller 4.

The first gas solenoid valve 23, the second gas solenoid valve 24, and the gas proportional valve 22 constitute the heating amount adjusting means of the present invention. In addition, the water tube thermistor 29
It is provided to prevent the water staying in the hot water supply heat exchanger 8 from being heated and abnormally heated when only the additional heating is performed, and the temperature detected by the water pipe thermistor 27 is set to a predetermined upper limit. When the temperature is exceeded, the controller 4 stops the combustion of the first burner 5 and the second burner 6.

The controller 4 transmits and receives various signals to and from a remote controller 40 installed in a bathroom or the like. The remote controller 40 is provided with switches (not shown) for setting hot water supply temperature, hot water temperature, additional heating time, and the like, and a display unit (not shown) for displaying hot water supply temperature, hot water temperature, and the like.

Next, referring to FIG.
Are hot water supply control means 50 for executing hot water supply operation for supplying hot water at a target hot water supply temperature from hot water supply pipe line 2, and additional heating control for performing additional heating operation for increasing the temperature of hot water stored in bathtub 4 to a target additional heating temperature. Means 51, a filling control means 52 for executing filling operation for supplying hot water of a target filling temperature to a bathtub by a target filling amount, and a total combustion amount by the first burner 5 and the second burner 6 (heating of the present invention). (Hereinafter, referred to as total burner combustion amount), the hot water supply heat distribution ratio grasping means 53 for calculating the ratio of the heat amount used for heating the hot water supply heat exchanger 8 side, and the above hot water supply operation And a data memory 54 (including the function of the thermal efficiency data storage means of the present invention) in which data necessary for performing the filling operation is stored.

Hot water supply control means 50 controls the amount of combustion of first burner 5 and second burner 6 so that hot water at the target hot water temperature set by remote controller 40 is supplied from hot water supply line 2. The hot water supply control means 50 detects the start of the water supply from the water pipe from the detection signal of the water flow sensor 13 when the callan (not shown) connected to the downstream side of the hot water supply pipe line 2 is opened, and the combustion fan 25, the supply of combustion air is started, and a high voltage is applied from the igniter 26 to the ignition plug 27 to generate spark discharge, and the original gas solenoid valve 21 and the second gas solenoid valve 23 are connected. The valve is opened and the second burner 6 is ignited.

Then, the hot water supply control means 50 opens both the first gas solenoid valve 23 and the second gas solenoid valve 24 to burn the first burner 5 and the second burner 6 "large combustion". 1
The gas solenoid valve 23 is opened, the second gas solenoid valve 24 is closed, and only the first burner 5 is burned. "Medium combustion", the first solenoid valve 23 is closed and the second solenoid valve 24 is opened. In three stages of “small combustion” in which only the second burner 6 is burned,
The total burner combustion amount by the burner 5 and the second burner 6 is adjusted. Further, the hot water supply control means 50 changes the opening degree of the gas proportional valve 22 so that “large combustion”, “medium combustion”,
The amount of combustion in "small combustion" is more finely controlled.

Here, as shown in Table 1 below, the data memory 54 stores the maximum combustion amount (Q
Large _max) and the minimum combustion rate (Q large min), the maximum combustion amount in the "medium burning" (Q in _max) and the minimum combustion rate (Q in _min), and the maximum combustion amount in the "small combustion" (Q small _max) And the data of the minimum combustion amount (Q small _min ) (determined by experiments and calculations).

[0030]

[Table 1]

However, all of the total burner combustion amount (Q _ALL ) depends on the water flowing in the hot water supply heat exchanger 8 and the reheating heat exchanger 7.
It is not used for heating the hot and cold water flowing inside, and there is also a waste amount of combustion. Therefore, the data memory 54
As shown in Table 2 below, “Large combustion (Q large
x, Q large min) "," Medium combustion (maximum in Q, min in Q) ",
Thermal efficiency (η) in “small combustion (Q small max, Q small min)”
Is stored.

[0032]

[Table 2]

Here, the thermal efficiency (η) is defined by the following equation (1). In addition, the thermal efficiency (η single max. To η single min) corresponding to the hot water single operation corresponds to the second thermal efficiency data of the present invention, and the thermal efficiency (η same max to η) corresponding to the simultaneous hot water supply and additional heating operation. (Small min) corresponds to the first thermal efficiency data of the present invention.

[0034]

(Equation 1)

In the equation (1), T _in 1 is the temperature of the water supplied from the water pipe to the hot water supply heat exchanger 8, T _out 2 is the temperature of the hot water discharged from the hot water supply heat exchanger 8, and W 2 is the hot water supply heat Exchanger 8
It is the flow rate of water passing through the inside. On the other hand, T _in 2 the hot water temperature which is accumulated in the bathtub 4, T _{o ut} 2 is the temperature of hot water to be tapped from the reheating heat exchanger, W2 in the hot water flow through the reheating pipe line 3 is there.

The thermal efficiency (η) is higher when the hot water supply operation and the additional heating operation are performed at the same time (hereinafter referred to as hot water supply / heating operation) than when only the hot water supply operation is performed alone (hereinafter, referred to as hot water supply alone operation).
Reheating operation) is slightly higher. this is,
This is because the effective total heat transfer area of the hot water supply heat exchanger 8 and the additional heating heat exchanger 7 becomes wider when the hot water supply and additional heating are simultaneously operated.

Therefore, in the present embodiment, as shown in Table 2 above, the thermal efficiency (η equal large max to η same small min, corresponding to the first thermal efficiency of the present invention) according to the simultaneous operation of hot water supply and additional heating. ) And the data of the thermal efficiency (η single max. To η single min, corresponding to the second thermal efficiency of the present invention) corresponding to the hot water supply alone operation are stored in the data memory 54 in advance. Then, hot water supply control means 50 determines the total burner combustion amount (Q _ALL ) using the thermal efficiency (η) according to the operation condition (hot water supply alone operation or hot water supply and additional heating simultaneous operation).

During hot water supply alone operation, the total burner combustion amount (Q
_ALL ) is consumed only for heating the water passing through the hot water supply heat exchanger 8. Then, the hot water supply control means 50 determines whether the detected temperature (T _H ) of the hot water supply
From the detected flow rate (F _W ) and the amount of heat (Q _R ) used to heat the water in the hot water supply heat exchanger 8, the temperature (T _W ) of the water supply from the water pipe is obtained by the following equation (2). I do. The amount of heat (Q _R ) is calculated by multiplying the total burner combustion amount (Q _ALL ) by the thermal efficiency (η).

[0039]

(Equation 2)

Then, the hot water supply control means 50 controls the hot water supply pipe 2
From the target hot water supply temperature (T_AHot water supply to supply hot water)
The amount of heat that needs to be given to the exchanger 8 (hereinafter, the required amount of hot water
(Q _nh) Is determined by the following equation (3).

[0041]

(Equation 3)

During the hot water supply alone operation, the additional heat exchanger 7 side
Does not require heating, so the hot water supply heat exchanger 8 and additional heating heat exchange
Total heat required to be provided to the heat exchanger 7 (hereinafter referred to as the total required heat
(Q _n)) Is necessary as shown in the following equation (4).
Hot water supply (Q_nh).

[0043]

(Equation 4)

On the other hand, during the simultaneous operation of hot water supply and reheating, a part of the total burner combustion amount (Q _ALL ) is also consumed for heating the hot and cold water circulating in the reheating line 3. Therefore, during simultaneous operation of hot water supply and additional heating, the required amount of hot water supply (Q _nh ) calculated by the above equation (3) is added to the amount of heat consumed by the additional heating heat exchanger 7 (hereinafter, additional heat consumption (Q _c )). ) Needs to be supplied to the hot water supply heat exchanger 8 and the additional heat exchanger 9.

Therefore, the hot water supply control means 50 determines the total required heat quantity (Q _n ) during the simultaneous operation of hot water supply and additional heating by the following equation (5).

[0046]

(Equation 5)

The additional heat consumption (Q _c ) is determined by the temperature of the hot water stored in the bathtub 4 detected by the bath thermistor 18 and the flow rate of hot water flowing through the additional heating pipe 3 determined by the capacity of the pump 17. And is grasped by.

Then, the hot water supply control means 50 controls each operation state (hot water supply alone operation or hot water supply operation) so as to obtain the total required heat quantity (Q _n ) determined by the equation (4) or the equation (5). -Simultaneous reheating operation), select the data of the thermal efficiency (η) shown in Table 2, and use the following equation (6)
Determine the total burner burn rate (Q _ALL ). Thereby, the hot water supply control means 50 can accurately determine the total burner combustion amount (Q _ALL ) according to each operation state.

[0049]

(Equation 6)

Then, the hot water supply control means 50 is controlled so that the burner total combustion amount (Q _ALL ) determined in this manner is generated.
Is selected from among the above-mentioned "large combustion", "medium combustion", and "small combustion", and by adjusting the opening of the gas proportional valve 22, the hot water supply temperature from the hot water supply pipe 2 is set to the target. Feed forward control is performed so as to maintain the hot water supply temperature.

It should be noted that this feedforward control should basically make it possible to match the hot water supply temperature from the hot water supply line 2 with the target hot water supply temperature. Ultimately, hot water supply control means 50 corrects the total burner combustion amount (Q _ALL ) by feedback control so that the actual hot water supply temperature detected by hot water supply thermistor 11 matches the target hot water supply temperature.

Further, in the case of the "large combustion" (the same applies to the "medium combustion" and the "small combustion") during the hot water supply alone operation, the thermal efficiency (the large Q min x the large Q <the large x <the large Q) for the intermediate combustion amount Q η)
Is calculated by the following proportional expression (7). The thermal efficiency (η) with respect to the intermediate combustion amount during the simultaneous operation of hot water supply and additional heating or hot water filling operation is also calculated by the same proportional calculation.

[0053]

(Equation 7)

Next, when performing the hot water filling operation, the hot water filling control means 52 instructs the hot water supply control means 50 to carry out hot water supply at the target hot water temperature set by the remote controller 40, and performs the pouring electromagnetic operation. The valve 15 is opened.

When the pouring solenoid valve 15 is opened, the supply of water from the water supply to the hot water supply line 2 is started with reference to FIG.
Hot water generated by heating in the hot water supply heat exchanger 8 is supplied from the hot water supply pipe 2 to the additional heating pipe 3 through the filling pipe 30 and passes through the additional heating heat exchanger 7 in the additional heating pipe 3. The water is supplied to the bathtub 4 via the first filling path R1 on the side and the second filling path R2 on the side not passing through the supplementary heat exchanger 7 of the supplementary heating pipe 3.

Here, when the combustion amounts of the first burner 5 and the second burner 6 are feedback-controlled so that the hot water supply temperature from the hot water supply pipe 2 detected by the hot water supply thermistor 11 becomes the target hot water temperature, the first The hot water supplied to the bathtub 4 via the hot water path R1 is further heated by the additional heat exchanger 7, so that the temperature of the hot water stored in the bathtub 4 becomes higher than the target hot water temperature.

Therefore, the hot water supply control means 50 controls the hot water supply temperature by performing only the feed forward control without performing the feedback control during the hot water filling operation. Then, when determining the total burner combustion amount (Q _ALL ) according to the above equation (6), the hot water supply control means 50 determines the thermal efficiency (η equal to η) corresponding to the simultaneous hot water supply and additional heating operation as shown in Table 2 above. Large ma
x ~ η same small min) is used.

Here, during the hot water filling operation, the water flowing through the hot water supply pipe line 2 is heated by the hot water supply heat exchanger 8, and
In the second hot water filling path R2, the hot water flowing in the additional heating pipe 3 is heated by the additional heating heat exchanger 7. In this situation, the water flowing in the hot water supply line 2 is heated by the hot water supply heat exchanger 8 and the pump 1 is heated by the additional heating heat exchanger 7 during the simultaneous operation of hot water supply and additional heating.
This is similar to the situation where the hot and cold water stored in the bathtub 4 circulated in 7 is heated.

Therefore, the thermal efficiency (η) during the filling operation
Is considered to be the same as the thermal efficiency (η) during the simultaneous operation of hot water supply and reheating. Therefore, the hot water supply control means 50
By controlling the combustion amount of the first burner 5 and the second burner 2 during the hot water filling operation using the thermal efficiency (η) according to the simultaneous reheating operation, the temperature of the hot water supplied to the bathtub 4 is set to the target. The temperature can be controlled with high accuracy.

In the present embodiment, as shown in Table 1 above, the thermal efficiency (η) corresponding to each operating condition is stored in the data memory 54, but is shown in Table 3 below. As described above, of the total burner combustion amount, the data of the heat amount actually used for the heating of the water by the hot water supply heat exchanger 8 and the heating of the hot water by the additional heating heat exchanger 7 is stored in the data memory 54 (in this case, the present invention). (Including the function of the calorific value data storage means), and the calorific value data may be used to determine the combustion amount of the first burner 5 and the second burner 6.

[0061]

[Table 3]

In this case, the total burner combustion amount (Q _ALL ) according to the total required heat amount (Q _n ) determined by the above equation (4) or (5) is obtained from Table 3. For example, the total required heat quantity (Q
When _n) was Q Tandai min as the corresponding total burner combustion rate (Q _ALL), Q large min is selected. In addition, the heat quantity (Q single maximum max to Q single small min) corresponding to the hot water supply alone operation corresponds to the first heat quantity data of the present invention, and the heat quantity (Q same large max to Q (Small min) corresponds to the second calorie data of the present invention.

In addition, the intermediate heat quantity Q single x (Q single min <Q single x <Q single max) in "large combustion" (same for "medium combustion" and "small combustion") in hot water supply alone operation the total burner combustion rate for (Q _ALL) is calculated by the following proportional equation (8). It should be noted that the total burner combustion amount (Q _ALL ) with respect to the intermediate heat amount during the simultaneous operation of hot water supply and reheating, or the hot water filling operation
Is calculated by the same proportional calculation.

[0064]

(Equation 8)

In this case, for example, by measuring the actual amount of heat for each solid of the water heater 1 and setting the amount of heat, the filling temperature can be controlled more accurately.

In the present embodiment, a burner using gas as fuel is shown as the heating means of the present invention. However, a burner using kerosene as fuel may be used. It may be.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a water heater with reheating according to the present invention.

FIG. 2 is a control block diagram of the water heater with additional heating shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hot water heater with additional heating, 2 ... Hot water supply line, 3 ... Additional heating line, 4 ... Bathtub, 5 ... First burner, 6 ... Second burner, 7 ...
Refired heat exchanger, 8: hot water supply heat exchanger, 9: bypass pipe,
10 ... bypass servo, 11 ... hot water supply thermistor, 12 ...
Heat exchange thermistor, 13: water flow sensor, 14: hot water servo, 15: pouring solenoid valve, 16: check valve, 17: pump,
18 ... bath thermistor, 19 ... bath water flow switch, 20
… Hot water sensor

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K005 KA10 3L024 CC08 DD04 DD13 DD14 DD17 DD22 DD27 EE02 EE12 FF11 GG03 GG04 GG05 GG06 GG22 GG24 GG28 GG32 GG33 HH02 HH13 HH22 HH26 HH31

Claims (2)

[Claims] 1. A reheating line connected to a bathtub at both ends for recirculating hot water retained in the bathtub for reheating, and one end connected to a water supply to heat water supplied from the water supply and to heat the water. A hot-water supply line for supplying hot water from the end, a re-heating heat exchanger for heating hot water flowing through the re-heating line, and a part of the water flowing through the hot-water supply line overlapping the re-heating heat exchanger. A hot water supply heat exchanger for heating water, a heating means for heating the reheating heat exchanger and the hot water supply heat exchanger, a heating amount adjusting means for adjusting a heating amount of the heating means, and hot water supply and reheating. The first thermal efficiency, which is the ratio of the amount of heat actually used for heating the water by the hot water supply heat exchanger and heating the hot water by the additional heating heat exchanger, out of the amount of heat generated by the heating means at the same time. Data and the amount of heat generated by the heating means when only hot water is supplied alone. A heat efficiency data storage means for storing data of a second heat efficiency, which is a ratio of the amount of heat actually used for heating water by the hot water supply heat exchanger, and hot water of a predetermined temperature is supplied from the hot water supply pipe. Controlling the heating amount of the heating means by the heating amount adjusting means,
When additional heating and hot water supply are performed simultaneously, the heating amount of the heating means is determined based on the first heat efficiency data. When only hot water supply is performed alone, the heating means is determined based on the second heat efficiency data. In the hot water supply unit with hot water supply provided with hot water supply control means for determining the amount of heating, the downstream side of the portion of the hot water supply pipe where water is heated by the hot water supply heat exchanger and the additional heating line are communicated. A first hot water supply path for supplying hot water heated and generated by the hot water supply heat exchanger to the bathtub from the hot water supply pipe via the additional heating pipe on a side heated by the additional heating heat exchanger; And a second hot water supply path to be supplied from the hot water supply pipe to the bathtub through the additional heat pipe on a side not heated by the additional heat exchanger, and the hot water supply control means includes: 1 bathing route and the 2nd bathing When supplying hot water to the bathtub from the hot water supply conduit via the road, the reheating water heater and determines the heating amount of said heating means based on the data of the first thermal efficiency. 2. A reheating line for circulating hot water retained in the bathtub at both ends for recirculating hot water and reheating, and one end connected to a water supply to heat water supplied from the water supply. A hot-water supply line for supplying hot water from the end, a re-heating heat exchanger for heating hot water flowing through the re-heating line, and a part of the water flowing through the hot-water supply line overlapping the re-heating heat exchanger. A hot water supply heat exchanger for heating water, a heating means for heating the reheating heat exchanger and the hot water supply heat exchanger, a heating amount adjusting means for adjusting a heating amount of the heating means, and hot water supply and reheating. The first heat quantity data provided by the heating means and used for heating the water by the hot water supply heat exchanger and heating the hot and cold water by the additional heating heat exchanger at the same time, and only the hot water supply is executed independently. The water supplied by the heating means and supplied by the hot water supply heat exchanger. A calorie data storage unit that stores data of a second calorie used for heat; and a heating amount of the heating unit controlled by the heating amount adjusting unit such that hot water of a predetermined temperature is supplied from the hot water supply pipe. ,
When additional heating and hot water supply are performed simultaneously, the heating amount of the heating means is determined based on the data of the first heat quantity. When only hot water supply is performed alone, the heating means is determined based on the data of the second heat quantity. In the hot water supply unit with hot water supply provided with hot water supply control means for determining the amount of heating, the downstream side of the portion of the hot water supply pipe where water is heated by the hot water supply heat exchanger and the additional heating line are communicated. A first hot water supply path for supplying hot water heated and generated by the hot water supply heat exchanger to the bathtub from the hot water supply pipe via the additional heating pipe on a side heated by the additional heating heat exchanger; And a second hot water supply path to be supplied from the hot water supply pipe to the bathtub through the additional heat pipe on a side not heated by the additional heat exchanger, and the hot water supply control means includes: The first hot water path and the second hot water path When supplying hot water to the bathtub from the hot water supply conduit via is characterized by determining the heating amount of said heating means based on the data of the first heat.