JP3335206B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus, and more particularly to a hot water supply apparatus capable of performing intermittent combustion as well as proportional combustion.

[0002]

2. Description of the Related Art As a method of operating a water heater with a heat amount equal to or less than a minimum continuous combustion heat amount Fmin of the water heater, a configuration in which intermittent combustion is performed has been disclosed (for example, Japanese Patent Publication No. SHO 61-1).
No. 16236). In such a water heater,
One intermittent combustion cycle includes an ignition period and a fire extinguishing period. By igniting and heating the combustion part for a short time within one intermittent combustion cycle, tapping at a desired temperature is obtained on average.

In the case of intermittent combustion, it is essential to set an intermittent combustion cycle and an ignition period and a fire extinguishing period. Conventionally, the required heat amount has been calculated based on the amount of incoming water, the incoming water temperature, the outlet temperature, and the set temperature, thereby calculating the average amount of heat in the intermittent combustion cycle.

FIG. 6 is an explanatory diagram of an intermittent combustion operation of a conventional hot water supply apparatus. The pulse periods P2 and P3 correspond to intermittent combustion periods. In each pulse cycle, the required calorie calculation output F1
The sum of the calorific value Z and the corrected calorific value FB is the calorific value sum Z, and the control calorie value F is obtained by averaging the calorific value sum Z over the pulse period. The required calorie calculation output F1 involves the amount of water input and the like, and is a feedforward control amount. On the other hand, the difference between the set temperature and the tapping temperature is involved in the corrected heat amount FB, and is a feedback control amount. Conventionally, the feedforward control amount and the feedback control amount are added and then averaged.

[0005]

As described above, in the conventional intermittent combustion water heater, the control amount that changes due to a sudden change in operating conditions, for example, a sudden change in the setting of the amount of incoming water or the amount of hot water, and the operation convergence of the system. (For example, the set temperature TS
And the control amount for making the hot water temperature TH coincident with each other, the control amount is controlled by taking an average value of the control signals after adding the two.

However, in this conventional control configuration, as shown in a pulse period P4 in FIG. 6, a required heat amount calculation output F corresponding to a sudden increase in the amount of hot water generated immediately before the end of the pulse period P4.
When a sudden increase of 1 (dFF) occurs, the control calorie F must be increased immediately and correspondingly. However, since the calorie sum Z is averaged over the pulse period P4, the increment of the control calorie F is only a little dss. As a result, a decrease in tapping temperature TH was inevitable.

[0007] In addition to such a drawback that the control amount is delayed, there is also a problem that the control amount is likely to deviate from the Nyquist stability condition with respect to the intermittent control system, so that a long-period vibration occurs in the control amount.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems and disadvantages. It is an object of the present invention to quickly respond to changes in operating conditions, such as a sudden increase in the flow rate of hot water, and to provide an offset between a set temperature and an outlet temperature. An object of the present invention is to provide a water heater having a removable control function.

[0009]

According to a first aspect of the present invention, there is provided a water heater, comprising: a water supply pipe; a heat exchanger connected to the water supply pipe; and a flow rate of water passing through the water supply pipe. A flow rate detecting section for detecting the temperature of the water, a water temperature detecting section for detecting the temperature of the water, a combustion section for heating the heat exchanger, a temperature setting section for outputting a set temperature of the hot water passing through the hot water pipe, and a hot water pipe. A hot water supply temperature detecting unit for detecting a hot water temperature of hot water passing therethrough, and a pulse cycle calculating unit for calculating a pulse cycle based on the control heat quantity, and a hot water supply device for intermittently burning the combustion unit according to the pulse cycle. A required calorie calculating unit for calculating a required calorific value based on a flow rate and a temperature of water passing through the water supply pipe, and an average for storing the detected tapping temperature and calculating and outputting an average tapping temperature based on the stored tapping temperature. Hot water temperature output section And a heat quantity correction unit for obtaining a control amount of heat compensation to the heat requirements on the basis of the average hot water temperature and the set temperature is provided, characterized by being configured to calculate a pulse period based on the control amount of heat.

A hot water supply apparatus according to a second aspect is characterized in that in the first aspect, the pulse cycle is corrected based on a deviation between the set temperature and the average tapping temperature.

A hot water supply apparatus according to a third aspect of the present invention is the hot water supply apparatus according to the first aspect, wherein the maximum and minimum values of the detected hot water temperature are stored, and the average hot water temperature is calculated based on the stored maximum and minimum values. An average hot water temperature output unit is provided.

According to a fourth aspect of the present invention, when the detected hot water temperature is higher than the stored maximum value, the detected hot water temperature is stored as the maximum value. When the tapping temperature is smaller than the stored minimum value, an average tapping temperature output unit that stores the detected tapping temperature as the minimum value is provided.

According to a fifth aspect of the present invention, in the hot water supply apparatus according to the first aspect, the output mode switching means for outputting the detected tapping temperature as an average tapping temperature when the deviation between the set temperature and the tapping temperature is large, comprises: It is characterized by being provided in a tapping temperature output section.

A hot water supply apparatus according to a sixth aspect of the present invention is the hot water supply apparatus according to the second aspect, further comprising a combustion mode switching section for switching between an intermittent combustion mode and a proportional combustion mode. The calorific value corrector corrects the pulse cycle based on the difference between the set temperature and the average tapping temperature to intermittently burn the combustor.In the proportional combustion mode, the calorie corrector corrects the set temperature and tapping temperature according to an instruction from the combustion mode switching unit. Characterized in that the combustion section is caused to perform proportional combustion based on the deviation of

[0015]

The average tapping temperature output section of the hot water supply apparatus according to claim 1 calculates and outputs an average tapping temperature based on the tapping temperature. On the other hand, the required calorie calculation unit calculates the required calorie based on the flow rate and the temperature of the water. The calorific value corrector corrects the required calorific value based on the average tapping temperature and the set temperature to obtain a control calorific value. As a result, the averaging operation is not performed on the required heat amount, but is performed only on the tapping temperature. The pulse cycle of the intermittent combustion is calculated based on the control calorie calculated in this manner.

A second aspect of the present invention provides a hot water supply apparatus that corrects and calculates a pulse cycle based on a deviation between a set temperature and an average tapping temperature.

The average tapping temperature output section of the hot water supply apparatus according to claim 3 stores the maximum and minimum values of the detected temperature, and calculates the average tapping temperature based on the stored maximum and minimum values.

The average tapping temperature output section of the hot water supply apparatus according to claim 4 stores the detected tapping temperature as the maximum value when the detected tapping temperature is larger than the stored maximum value.
If the detected tapping temperature is smaller than the stored minimum value, the detected tapping temperature is stored as the minimum value.

The output mode switching means provided in the average hot water temperature output section of the hot water supply apparatus according to claim 5 outputs the hot water temperature detected when the deviation between the set temperature and the hot water temperature is large as an average hot water temperature.

The combustion mode switching section of the water heater according to claim 6 switches between an intermittent combustion mode and a proportional combustion mode. In the intermittent combustion mode, the pulse period is corrected based on the difference between the set temperature and the average tapping temperature, and the combustion part is intermittently burned.
In the proportional combustion mode, the combustion section performs proportional combustion based on the deviation between the set temperature and the detected tapping temperature.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show a block configuration of the hot water supply apparatus according to the first aspect. The hot water supply apparatus 1 according to claim 1 includes a required calorie computing unit 14, an average tapping temperature output unit 16, a PI computing unit 18, a calorific value correcting unit 19, a pulse cycle computing unit 22, and a drive current computing unit 21.

The hot water supply apparatus 1 further includes an opening / closing valve 2, an opening / closing valve driving section 24, a proportional valve 3, and a proportional valve driving section 2 as a water heater main body.
3, a burner 4, a heat exchanger 5, a flow rate sensor 7, a flow rate detecting unit 10, an incoming water temperature sensor 6, an incoming water temperature detecting unit 11, a hot water temperature sensor 8, a hot water temperature detecting unit 13, and a temperature setting unit 12.

In response to the signal 8a from the flow sensor 7, the flow detector 10 sends the flow Q to the required calorie calculator 14. Further, the incoming water temperature detecting section 11 receives the signal 6 a from the incoming water temperature sensor 6 and sends the water temperature TC to the required calorific value calculating section 14. Further, the temperature setting unit 12 sends the set temperature TS to the required heat amount calculation unit 14.

The required heat quantity calculating section 14 calculates the flow rate Q, the water temperature TC,
The required heat amount is calculated based on the set temperature TS, and the required heat amount calculation output F1 is sent to the heat amount correction unit 19 as a signal 14a.

The tapping temperature detecting section 13 receives the signal 8a from the tapping temperature sensor 8 and sends the tapping temperature TH to the average tapping temperature output section 16. The average tapping temperature output section 16 calculates the average tapping temperature TAV based on the tapping temperature TH and the set temperature TS received from the temperature setting section 12, and outputs it as a signal 18a. This signal 18a is input to the calorie correction unit 19.

The calorific value correcting section 19 outputs the signal 14a and the signal 18a.
Is calculated based on the control heat amount F, and is sent to the drive current calculation unit 21 and the pulse cycle calculation unit 22. The drive current calculation unit 21 calculates a current value at the time of the minimum valve opening and sends this to the proportional valve drive unit 23 as a signal 21a.
3 generates a signal 23a based on the signal, and keeps the proportional valve 3 at the minimum valve opening degree.

The pulse cycle calculating section 22 calculates a pulse cycle P composed of the sum of the combustion period and the fire extinguishing period, and sends a signal 22a for opening and closing the on-off valve 2 to the on-off valve driving section 24 based on the pulse cycle P. . The on-off valve drive unit 24 opens and closes the on-off valve 2 based on this.

FIG. 3 explains the intermittent combustion operation of the hot water supply device of the first embodiment. In the pulse periods P2 and P3, the average corrected calorific value FAV maintains a substantially constant value, and the required calorific value calculation output F1 is also substantially constant, indicating that stable operation is being continued. The control calorie F is the sum of the required calorie calculation output F1 and the average corrected calorie FAV.

At the pulse period P4, a sudden increase (dFF) of the required calorific value calculation output F1 occurred immediately before the end.
However, according to the configuration of the present invention, the required calorific value calculation output F
1 is not averaged in the pulse period P4. Therefore, the sudden increase of the required calorific value calculation output F1 is immediately reflected on the control calorie F, and the control calorie F increases by dFF without delay.
As described above, since the control heat amount F immediately increases and responds to the sudden increase in the incoming water amount, the tapping temperature TH does not decrease and a stable value can be maintained.

As described above, the hot water supply apparatus of the present invention processes a feedforward control amount such as a change in the flow rate Q,
Since the processing of the feedback control amount, such as the reduction of the deviation between the set temperature TS and the tapping temperature TH, is separated and the averaging is performed only on the feedback control amount, it is possible to quickly respond to changes in operating conditions and satisfy the system stability condition. Easily realized,
Also, the deviation between the tapping temperature TH and the average tapping temperature TAV, that is, the offset can be easily removed.

In FIG. 1, the PI calculation unit 18 has a configuration according to claim 2, wherein the set temperature TS is set as one input, the average tapping temperature TAV is set as the other input, and the TS-TA
V is calculated, and a value obtained by performing a PI calculation on the calculation result is output.

FIG. 4 is a block diagram of an embodiment replacing the PI operation unit 18 according to the second aspect. In FIG. 4, the heat absorption amount calculation unit calculates the actual heat absorption amount FR by multiplying the difference between the water temperature TC and the average tapping temperature TAV by the flow rate Q. Further, the dividing unit calculates the ratio F1 / F1 between the actual heat absorption amount FR and the required heat amount calculation output F1.
Output FR. Note that the calorific value correction unit 19 in FIG.
However, the pulse period is corrected by multiplying the required heat calculation output F1 by the ratio FR.

As shown in FIG. 2, the average tapping temperature output section 16 of the hot water supply apparatus according to the third aspect includes a TH state determining means 163,
It comprises TU storage means 165, TU output means 166, TL output means 167, TL storage means 168, and average tapping temperature calculation means 169.

The tapping temperature TH is determined by a TH state determining means 163,
The signals are input to the TU output means 166 and the TL output means 167, respectively. TH state determination means 163 determines whether the tapping temperature TH has increased or decreased. Hot water temperature TH is maximum (or maximum)
Alternatively, when indicating the minimum (or minimum), the TH state determination unit 163 inputs the signal 163a to the TU output unit 166 and the TL output unit 167, respectively.

TU output means 166 is maximum (or maximum)
The temperature TU is sent to the average tapping temperature calculating means 169, and the TL output means 167 sends the minimum (or minimum) temperature TL to the average tapping temperature calculating means 169. Average tapping temperature calculating means 16
9 calculates the average tapping temperature TAV based on the
Send to I operation unit 18.

The configuration of the hot water supply apparatus of the fourth aspect will be described with reference to FIG. 2, and the operation flow of this hot water supply apparatus will be described with reference to FIG. The average tapping temperature output section 16 of the hot water supply device of claim 4 is
Transient state determination means 161, TU storage means 165, TU output means 166, TL output means 167, TL storage means 16
Consists of eight. The transient state determination means 161 receives the set temperature TS and the tap water temperature TH, and furthermore, outputs the maximum temperature TU as a signal 166a from the TU output means 166 and the TL output means 167
Receives the minimum temperature TL as a signal 167a from the respective devices.

The transient state determining means 161 transmits the result of the determination of the transient state as a signal 161a, and inputs this to the TU output means 166 and the TL output means 167. To TU output means 166 and TL output means 167, tapping temperature TH is further input.

The TU output means 166 is the transient state determination means 1
61 receives signal 161a from tapping temperature TH and TU.
The maximum temperature TU stored in the storage means 165 is compared, and if the tapping temperature TH is higher than the maximum temperature TU stored, the tapping temperature TH is stored in the TU storage means 165 as the maximum temperature TU. (Step S in FIG. 5)
7, S8, S9, S12). Thereby, the maximum temperature TU is updated.

Similarly, when TL output means 167 receives signal 161a from transient state determination means 161, tapping temperature T
H and the minimum temperature TL stored in the TL storage means 168
And the minimum temperature T in which the tapping temperature TH is stored.
If the tapping temperature TH is smaller than the minimum temperature T,
L is stored in the TL storage means 168 (corresponding to steps S7, S8, S10, S11, S13 in FIG. 5). Thereby, the minimum temperature TL is updated.

When the absolute value of the deviation between the set temperature TS and the tapping temperature TH exceeds a predetermined temperature range, for example, 10 degrees Celsius, or when the absolute value of the deviation between the maximum temperature TU and the minimum temperature TL is within the predetermined temperature range, For example, when the temperature exceeds 10 degrees Celsius, the maximum temperature TU and the minimum temperature TL may be updated and rewritten at the tapping temperature TH (Steps S3 and S3 in FIG. 5).
4, corresponding to S5).

Further, a stable state determining means 162 is provided in the average tapping temperature output section 16, and the temperature change of the tapping temperature TH falls within a prescribed range (for example, 0.5 degrees Celsius) for a prescribed period (for example, 8 seconds). In the stable state, the maximum temperature TU and the minimum temperature TL may be updated and rewritten at the tapping temperature TH (corresponding to steps S1 and S2 in FIG. 5).

In the water heater according to the third and fourth aspects,
Although the average tapping temperature is calculated based on the maximum and minimum values of tapping temperature, for example, a method of storing N tapping temperatures and calculating the average tapping temperature by taking the average of the N tapping temperatures. Is also useful.

In the hot water supply apparatus according to the fifth aspect, the average tapping temperature output section 16 is constituted by using the output mode switching means 164.
Referring to FIG. 2, the transient state determining means 161 calculates a deviation between the set temperature TS and the tapping temperature TH, and if the absolute value of the deviation exceeds a predetermined value, for example, 10 degrees Celsius, determines that the apparatus is in a transient state. Then, the signal 161a is sent to the output mode switching means 164.

The output mode switching means 164 outputs the signal 161a
As a result, it is known that the deviation between the set temperature TS and the tapping temperature TH exceeds a predetermined value, and the detected tapping temperature T
Command signal 164 for outputting H as average tapping temperature TAV
a and 164b are output to the TU output means 166 and the TL output means 16
Send to 7 respectively.

Further, the temperature change of tapping temperature TH takes a predetermined period (for example, 8 seconds) and a predetermined range (for example, 0.5 degree Celsius).
If the temperature falls within the range, the stable state determining means 162 provided in the average tapping temperature output section 16 determines this, and sends a signal 162a indicating that the state is stable to the output mode switching means 164.

Output mode switching means 164 receives command signal 16 for outputting tapping temperature TH as average tapping temperature TAV when receiving signal 161a from transient state determining means 161 or signal 162a from stable state determining means 162.
4a and 164b are transmitted. On the other hand, the transient state determining means 1
61 or when there is no signal input from the stable state determining means 162, the output mode switching means 164 receives the signal 163a from the TH state determining means 163 and outputs the average tapping temperature TA
Command signals 164a and 164b for outputting V are transmitted.

A hot water supply apparatus according to a sixth aspect of the present invention is different from the hot water supply apparatus according to the first aspect in that the combustion mode switching section 15 and its input / output signal 1
4b and 15a. In FIG. 1, the combustion mode switching unit 15 receives a required heat amount calculation output F1 from the necessary heat amount calculation unit 14 as a signal 14b. Here, the required calorie calculation output F1 is the minimum continuous combustion calorie Fm of the water heater 1.
If it is equal to or greater than in, the combustion mode switching unit 15 issues a proportional mode command to operate the hot water supply apparatus 1 in the proportional mode.

The command for the proportional mode issued by the combustion mode switching unit 15 is received by the correction heat amount selection unit 20 as a signal 15a, and the correction heat amount selection unit 20 selects the PID calculation unit 17 at this time, and the PID calculation unit 17 The signal 17a is received.

On the other hand, the pulse period calculator 22 also outputs the signal 15a
In response, the pulse cycle calculator 22 sends a signal 22 a for constantly opening the on-off valve 2 to the on-off valve driving unit 24 during combustion. The on-off valve drive unit 24 normally opens the on-off valve 2 based on this.

Further, the drive current calculation unit 21 also outputs the signal 15a
The drive current calculation unit 21 receives the current 21a proportional to the control heat amount F sent from the heat amount correction unit 19 and outputs the current 21a to the proportional valve drive unit 2.
3 and the proportional valve drive unit 23 outputs a signal 23a based on the
To drive the proportional valve 3.

The combustion mode switching section 15 is provided with the necessary heat quantity calculating section 1
4 is the required calorie calculation output F1 received from the hot water supply device 1
If it is not more than the minimum continuous combustion heat amount Fmin, the combustion mode switching unit 15 issues an intermittent mode command to operate the water heater 1 in the intermittent mode.

The intermittent mode command issued by the combustion mode switching unit 15 is received as a signal 15a by the correction heat amount selection unit 20, and the correction heat amount selection unit 20 selects the PI operation unit 18 at this time, and Signal 18a is received.

On the other hand, the pulse period calculator 22 also outputs the signal 15a.
The pulse cycle calculator 22 calculates a pulse cycle P composed of the sum of the combustion period and the fire extinguishing period, and sends a signal 22a for opening and closing the on-off valve 2 based on the pulse cycle P to the on-off valve driver 24. . The on-off valve drive unit 24 opens and closes the on-off valve 2 based on this.

Further, the drive current calculation section 21 also outputs the signal 15a
Then, the drive current calculation unit 21 calculates the current value at the time of the minimum valve opening and sends this to the proportional valve drive unit 23 as a signal 21a, and the proportional valve drive unit 23 issues a signal 23a based on the calculated The valve 3 is kept at the minimum valve opening.

By the operation described above, the combustion mode switching section 1
5. The hot water supply apparatus 1 according to claim 6, wherein the control unit automatically switches between the proportional mode and the intermittent mode in accordance with the required calorie output F1.
Can automatically execute the proportional mode and the intermittent mode.

The control unit of the water heater according to the present invention is a microcomputer of a stored program system.
, But any other controller,
It is also possible to configure with a logic circuit or the like.

[0057]

As described above, the average tapping temperature output section of the hot water supply apparatus according to the first aspect calculates and outputs the average tapping temperature based on the tapping temperature, and the required calorie computing section calculates the flow rate of water,
The required calorific value is calculated based on the temperature, and the calorific value correction unit corrects the required calorific value based on the average tapping temperature and the set temperature to obtain the control calorific value. The averaging operation is added only to the temperature, so that it is possible to quickly respond to a change in the use condition.

The hot water supply apparatus according to the second aspect corrects the pulse cycle based on the deviation between the set temperature and the average tapping temperature, so that an accurate pulse cycle can be realized.

The average tapping temperature output section of the hot water supply apparatus according to claim 3 stores the maximum and minimum values of the detected temperature and calculates the average tapping temperature based on the stored maximum and minimum values.
The average tapping temperature can be calculated quickly.

The average tapping temperature output section of the hot water supply apparatus according to claim 4 stores the detected tapping temperature as the maximum value when the detected tapping temperature is larger than the stored maximum value.
If the detected tapping temperature is smaller than the stored minimum value, the detected tapping temperature is stored as the minimum value.
In the transient state, the maximum value or the minimum value can always be updated based on the temperature during the sudden change, so that the control can be performed quickly.

The output mode switching means provided in the average hot water temperature output section of the hot water supply apparatus according to claim 5 outputs the hot water temperature detected when the deviation between the set temperature and the hot water temperature is large as the average hot water temperature. The calculation of the average tapping temperature in the case of a large deviation can be dispensed with, and the control operation without loss can be speeded up.

The combustion mode switching section of the water heater according to claim 6 switches between the intermittent combustion mode and the proportional combustion mode,
In the intermittent combustion mode, the pulse period is corrected based on the difference between the set temperature and the average tapping temperature to intermittently burn the combustion portion,
In addition, in the proportional combustion mode, the combustion section performs the proportional combustion based on the deviation between the set temperature and the detected hot water temperature, so that a hot water supply apparatus having a wide range can be realized.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a water heater according to the present invention.

FIG. 2 is a functional block diagram of an average tapping temperature output unit of FIG. 1;

FIG. 3 is an explanatory diagram of an intermittent combustion operation of the hot water supply apparatus according to the present invention.

FIG. 4 is a partial block diagram of another embodiment of the hot water supply apparatus according to the present invention.

FIG. 5 is an operation flowchart of an average tapping temperature output section of FIG. 2;

FIG. 6 is an explanatory diagram of an intermittent combustion operation of a conventional hot water supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot-water supply device 2 On-off valve 3 Proportional valve 4 Combustion part 5 Heat exchanger 6 Inlet water temperature sensor 7 Flow rate sensor 8 Outlet water temperature sensor 10 Flow rate detection part 11 Inlet water temperature detection part 12 Temperature setting part 13 Outlet water temperature detection part 14 Required heat amount calculation part 15 Combustion mode switching unit 16 Average tapping temperature output unit 17 PID calculation unit 18 PI calculation unit 19 Heat quantity correction unit 20 Correction heat quantity selection unit 21 Drive current calculation unit 22 Pulse cycle calculation unit Q Flow rate TC Water temperature TS Set temperature TH Tapping temperature F control Calorie F1 Required calorie calculation output TAV Average tapping temperature

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takeo Oda Examiner, Masayuki Hasui, Japan Yupro Co., Ltd. 43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo (56) References JP-A-5-10590 (JP, A JP-A-5-240505 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 1/10 302 F24H 1/18 302

Claims (6)

(57) [Claims] A heat exchanger connected to the water supply pipe and the hot water supply pipe; a flow rate detection section for detecting a flow rate of water passing through the water supply pipe; an input water temperature detection section for detecting a temperature of the water; A combustion unit that heats the heat exchanger, a temperature setting unit that outputs a set temperature of the hot water passing through the hot water supply pipe, a tapping temperature detection unit that detects a tapping temperature of the hot water that passes through the hot water pipe, and a control heat quantity. A water heater for intermittently burning the combustion section according to the pulse cycle; calculating a required heat quantity based on the set temperature and a flow rate and a temperature of water passing through the water supply pipe; A required calorific value calculating unit, an average tapping temperature output unit that stores the detected tapping temperature, calculates and outputs an average tapping temperature based on the stored tapping temperature, Based on A heat amount correction unit for correcting the required heat amount to obtain a control heat amount, wherein the pulse cycle is calculated based on the control heat amount. 2. The hot water supply apparatus according to claim 1, wherein the pulse cycle is corrected based on a difference between the set temperature and the average tapping temperature. 3. An average hot water temperature output section for storing maximum and minimum values of the detected hot water temperature and calculating an average hot water temperature based on the stored maximum and minimum values. The hot water supply device according to claim 1. 4. When the detected tapping temperature is higher than the stored maximum value, the detected tapping temperature is stored as a maximum value, and the detected tapping temperature is smaller than the stored minimum value. 4. The hot water supply apparatus according to claim 3, further comprising: an average hot water temperature output unit that stores the detected hot water temperature as a minimum value. 5. An average tapping temperature output section comprising an output mode switching means for outputting the detected tapping temperature as the average tapping temperature when a deviation between the set temperature and the tapping temperature is large. The hot water supply apparatus according to claim 1, wherein 6. A combustion mode switching section for switching between an intermittent combustion mode and a proportional combustion mode is provided. In the intermittent combustion mode, a heat amount correction section operates according to an instruction from the combustion mode switching section to determine a deviation between the set temperature and the average tapping temperature. In the proportional combustion mode, the heat quantity correction unit proportionally modulates the combustion unit based on the deviation between the set temperature and the tapping temperature according to an instruction from the combustion mode switching unit. 3. The hot water supply device according to claim 2, wherein the hot water is burned.