KR101304974B1 - Controlling method for primary combustion amount of hot water use in heating apparatus - Google Patents

Abstract

The present invention relates to a method for controlling the initial combustion amount of hot water of a hot water heater, in particular, igniting when water flow is detected due to the use of hot water, and performing normal combustion amount control with a predetermined minimum heat quantity (Q1); Continuously detecting and storing hot water supply temperature at a predetermined second time t2 interval for a predetermined first time t1 and updating a minimum temperature; Determining whether a predetermined first time t1, which is a minimum temperature update time with respect to the hot water supply temperature, has elapsed; When the predetermined first time t1 has elapsed, determining a minimum temperature of the hot water supply temperature detected during the predetermined first time t1 as a direct water temperature Tin ℃; Calculating a temperature difference (T ° C) by subtracting the direct water temperature (Tin ° C) determined at the user's set temperature (Tset ° C); Is the temperature difference (T ° C) calculated above is less than a predetermined first temperature (A ° C), a temperature between a first temperature (A ° C) or more and less than a predetermined second temperature (B ° C), or a second temperature (B ° C) ) Continuously determining whether or not abnormalities; As a result of the comparison, if the temperature difference (T ° C.) is less than the determined first temperature (A ° C.), the combustion amount of the combustion unit is continuously controlled to the current combustion amount (Q 2), and the second temperature (B) determined by the first temperature (A ° C.) or more. If the temperature is less than the maximum combustion amount of the hot water heater at a temperature of less than the maximum combustion amount of the water heater, the combustion amount of the combustion unit is increased and controlled. And increasing and controlling the combustion amount of the combustion unit by the fourth combustion amount Q4 larger than Q3.
As described above, in the present invention, the combustion amount control for supplying the hot water in the hot water heater is controlled to be close to the required amount of combustion to speed up the hot water supply rate and to provide a stable hot water supply. It is possible to accurately calculate the amount of combustion of hot water supply through the determination of the minimum temperature of the water supply.

Description

Controlling method for primary combustion amount of hot water use in heating apparatus}

The present invention relates to a method for controlling the initial combustion amount of hot water in a hot water heater, and more particularly, to control the amount of combustion for hot water supply in a hot water heater to be close to the required amount of combustion to speed up the hot water supply and to provide a stable hot water supply. The inlet temperature detection is invented to accurately calculate the amount of combustion of hot water supply through a method of determining the inlet temperature by determining the lowest temperature of the temperature detected for a predetermined time from the use of hot water.

In general, the blower for supplying combustion air to the combustion chamber of the hot water supplying water heater has a mass of a rotating body, so the rotational speed cannot be changed rapidly.

On the other hand, the fuel regulator (for example, the proportional valve) for supplying fuel to the combustion chamber can easily change the supply amount of fuel because the mass of the valve body is small. For this reason, if the blower and the fuel regulator are controlled independently or the fuel regulator and the blower are controlled at the same time, an abnormality in the air-fuel ratio occurs because the amount of fuel supplied by the fuel regulator and the air volume of the blower are not suitable when the amount of combustion changes.

Therefore, the air volume of the blower is controlled according to the amount of combustion, and the opening degree of the fuel regulator is controlled according to the air volume and the combustion state (air ratio) of the blower to prevent abnormality of the air-fuel ratio when the amount of combustion changes. A hot water heater is devised (Japanese Patent Laid-Open No. 62-252826).

In addition, the conventional combustion amount is calculated by the feedforward control based on the set temperature, the inlet temperature, the quantity, and the thermal efficiency so that the hot water of the set temperature set by the user can be obtained.

Conventional Patent Publication No. 1994-4184, "Combustion amount control device of a hot water heater", has been proposed, which is a combustion unit for burning fuel and a blower for supplying combustion air to the combustion unit, and heat and water obtained by combustion of the fuel. In a hot water heater comprising a heat exchanger for heat-exchanging heat to heat water, the combustion amount control apparatus for a hot water heater, which controls the amount of combustion by controlling the air blow amount of the blower, is detected by a temperature Ts set by a controller and an inlet temperature sensor. The feedforward combustion amount required to maintain the tapping temperature at the set temperature is calculated by multiplying the difference between the inlet temperature Ti, the water quantity W detected by the water quantity detection sensor, and the heat exchange efficiency l / eff of the heat exchanger. Feedforward combustion amount calculating means; The difference between the set temperature Ts set by the controller and the tapping temperature To detected by the tapping temperature sensor, the heat capacity M preset in the heat exchanger, and the bypass ratio between the heat exchanger and the bypass channel. Heat exchange capacity corrected combustion amount calculating means for multiplying the constant (a) according to the result and calculating a heat exchange capacity corrected combustion amount; Air-fuel ratio corrected combustion amount calculating means for correcting an amount of gas increased or decreased in accordance with the air-fuel ratio correction by inverting the sign of the air-fuel ratio corrected combustion amount N to calculate an air-fuel ratio corrected combustion amount when the air-fuel ratio is corrected by the controller; The difference between the set temperature Ts set by the controller and the tapping temperature To detected by the tapping temperature sensor, the water quantity W detected by the water quantity detection sensor, and the proportional constant E are multiplied. Proportional correction combustion amount calculating means for calculating a correction combustion amount; Integral correction combustion amount calculating means for calculating an integral correction combustion amount by integrating the difference between the set temperature Ts set by the controller and the tapping temperature detected by the tapping temperature sensor; The feed forward combustion amount, the heat exchange capacity correction combustion amount, the air-fuel ratio correction combustion amount, the proportional correction combustion amount, and the integral correction combustion amount calculated by the respective means are determined to control the combustion amount of the hot water heater.

That is, in the combustion amount control apparatus of the conventional hot water heater, the feed forward combustion amount QFF, the heat exchange capacity correction combustion amount K, the air-fuel ratio correction combustion amount T, the proportional correction combustion amount P, and the integral to determine the combustion amount Q The correction amount of combustion I is added to determine the amount of combustion actually controlled.

This can be expressed as a simple equation: Q = QFF + K + T + P + I ..... Equation (1).

In the equation (1), the pod forward combustion amount QFF is determined by the difference between the set temperature Ts set by the controller and the inlet temperature Ti detected by the inlet temperature sensor, the quantity W detected by the quantity sensor, Is calculated by multiplying the heat exchange efficiency (I / eff) of the heat exchanger by the feedforward combustion amount calculating means.

If this is expressed by a formula, it is represented by equation (2) QFF = (Ts-Ti) W / eff.

In addition, the heat exchange capacity correction combustion amount (K) is a heat capacity set in advance according to the difference (Ts-To) between the set temperature (Ts) set by the controller and the tapping temperature (To) detected by the tapping temperature sensor and the heat exchanger used. (M) and the constant (a) corresponding to the bypass ratio between the heat exchanger and the bypass channel are multiplied by the heat exchange capacity corrected combustion amount calculating means.

This is represented by the equation K = a (Ts-To) M ... (3).

Further, the calculation of the heat exchange capacity corrected combustion amount K calculates the virtual temperature Te of the heat exchanger necessary for obtaining the set temperature Ts set by the control unit, and by the virtual temperature Te and the hot water temperature sensor. The difference from the detected hot water temperature Tm and the heat capacity M may be multiplied and calculated.

In addition, this is represented by equation (4) when K = (Te-Tm) M .....

On the other hand, when the air-fuel ratio corrected combustion amount T is corrected by the control unit, when the air-fuel ratio is corrected, the air-fuel ratio corrected combustion amount is calculated by correcting the amount of gas that is increased or decreased according to the air-fuel ratio correction and inverting the sign of the corrected combustion amount N by the air-fuel ratio correction. Inverted in the Sudan.

This is represented by the formula T = -N ... (5).

The calculation of the proportional correction combustion amount P in equation (1) is based on the difference between the set temperature Ts set by the controller and the tapping temperature To detected by the tapping temperature sensor, and the amount W detected by the quantity detecting sensor. ) Is calculated by multiplying the proportional constant E by the proportional correction combustion amount calculating means.

If this is expressed as an expression, it is represented by P = E (Ts-To) W ..... (6).

Calculation of the integrally corrected combustion amount I in equation (1) is based on the difference (Ts-To) between the set temperature Ts set by the controller and the tapping temperature To detected by the tapping temperature sensor. It is integral.

If this is expressed as an expression, In = In-1 + bWn (Ts-To) ... is expressed by equation (7).

Here, bxWn represents an integral constant, In is an integral correction combustion amount calculated this time, and In-1 is an integral correction combustion amount calculated last time.

By proportioning the amount of change in the integrally corrected combustion amount I to the flow rate Wn, the time delay necessary for the feedback is corrected, so that the integrally corrected combustion amount I can be uniformly evaluated throughout the quantity.

However, such a control method may calculate the combustion amount Q only when the acquisition temperature Ti and the quantity W are detected. In a control apparatus that does not have a means for detecting the inlet temperature Ti and the quantity W, in order to determine the combustion amount Q, the heat exchange corrected combustion amount K, the air-fuel ratio corrected combustion amount T, and the proportionally corrected combustion amount P are determined. The value obtained by adding the integral correction combustion amount I is determined as the actual amount of combustion.

This is expressed as a formula: Q = K + T + P + I. Is represented by equation (8),

In the equation (8), the proportional correction combustion amount P is calculated by calculating the difference between the set temperature Ts set by the controller and the tapping temperature To detected by the tapping temperature sensor and the proportional constant E. Calculated by multiplying by.

This is expressed as a formula: P = E (Ts-To)... It is represented by equation (9).

In the equation (8), the integral correction combustion amount I is calculated by calculating the difference Ts-To between the set temperature Ts set by the controller and the tapping temperature To detected by the tapping temperature sensor. It is integral.

This is expressed as a formula. In = In-1 + b (Ts-To). It is represented by equation (10).

Where b represents an integral constant, In is an integral correction combustion amount to be calculated this time,

In-1 is the integral correction combustion amount calculated last time.

The integrally corrected combustion amount I is proportional to the difference Ts-To between the set temperature Ts set by the controller and the tapping temperature To detected by the tapping temperature sensor. Ts-To) can be evaluated uniformly.

By the way, this control method has the advantage that the amount of combustion can be controlled according to the tapping temperature changes to control the hot water to the desired temperature, but the time to reach the set temperature is somewhat timed to reach the set temperature gradually in the initial use of hot water Will be taken.

In order to compensate for this, when the proportional correction combustion amount and the integral correction combustion amount are increased, the hot water temperature may become an overshoot temperature. Therefore, the proportional correction combustion amount and the integral correction combustion amount cannot be set to a predetermined value or more.

In order to improve this situation, if the amount of combustion is increased only at the beginning of combustion and the tapping temperature reaches the set temperature, there is a need for a technology capable of shortening the time to reach the set temperature during initial combustion by controlling the amount of combustion as in the prior art.

In other words, in order to determine the combustion amount Q, the actual combustion amount should be determined by calculating the proportionally corrected combustion amount P and the integrally corrected combustion amount I with factors such as set temperature, inlet temperature, and flow rate. In the case of controlling the combustion amount with one hot water supply temperature sensor, in order to determine the combustion amount (Q), the addition amount of the proportionally corrected combustion amount (P) and the integrally corrected combustion amount (I) is adjusted according to the change of the hot water supply temperature, so that the hot water is heated to a desired temperature. Although it has the advantage that it can control the amount of combustion at the beginning of using hot water, it is not possible to calculate the required amount of combustion accurately. .

To improve this, if the proportionally corrected combustion amount (P) and the integrally corrected combustion amount (I) are increased at the initial use of the hot water, the hot water temperature may occur repeatedly in the overshoot and undershoot temperature, and the inlet temperature is high or If the quantity is small, since the combustion is severely repeated on / off occurs, there is a problem that the proportional correction combustion amount (P) and the integral correction combustion amount (I) cannot be set to a predetermined value or more.

In addition, if the amount of combustion Q required for the current control is not known accurately, if a high amount of combustion is initially put instead of the minimum amount of combustion, the amount of combustion Q may not follow the temperature and combustion is turned on and off, resulting in an inability to control the temperature. There is a problem

The present invention has been made to solve such a conventional problem, and in order to determine the combustion amount (Q) in the hot water heater, the proportional correction combustion amount (P), integral correction combustion amount (I), such as the set temperature, inlet temperature, flow rate, etc. The actual amount of combustion should be determined by adding the elements, but when the hot water temperature is controlled by one of the hot water supply temperature sensors because the necessary elements are not sufficiently provided, the control unit can be controlled to approach the required amount of control combustion after initial ignition. According to the difference between the set temperature and the inlet temperature set by the different combustion amount (Q) to the initial value control the combustion amount (Q) to increase the heating rate of the hot water temperature, proportional correction combustion amount (P) and integral correction combustion amount (I) It is an object of the present invention to provide a method for controlling the initial combustion amount of hot water in a hot water heater, which can solve the overshoot and undershoot by setting the proper value.

Another object of the present invention, since the inlet temperature detection is only one of the hot water supply temperature sensor, as a method for determining the inlet temperature, there may also be a method of determining the inlet temperature (direct water temperature) to be supplied with hot water before combustion. In this case, when the hot water is finished and reused, the hot water temperature remaining in the combustion chamber is determined as the inlet temperature (direct water temperature). Therefore, an error may occur in determining the inlet temperature. The temperature change of the hot water supply temperature sensor is continuously updated for a certain period of time from the start of operation (combustion), and the minimum temperature of the input temperature is determined as the inlet temperature (direct water temperature) to quickly reach the set temperature. It is to provide a method for controlling the initial combustion amount of hot water of the hot water heater.

The initial combustion amount control method for using hot water of the hot water heater of the present invention for solving the above problems includes a combustion unit for burning fuel, a blower for supplying combustion air to the combustion unit, and heat and water obtained by combustion of the fuel. Heat exchanger to heat water by heat exchanger, adjusting device to set temperature, tapping temperature sensor to detect tapping temperature of heat exchanger, water flow detection sensor to detect water flow, and control unit to perform overall control operation of water heater An initial combustion amount control method for using hot water of a hot water heater, comprising: igniting a combustion unit when water flow is detected due to the use of hot water; Performing normal combustion amount control with a predetermined minimum heat quantity Q1; Continuously detecting and storing hot water supply temperature at a predetermined second time t2 interval for a predetermined first time t1 and updating a minimum temperature; Determining whether a predetermined first time t1, which is a minimum temperature update time with respect to the hot water supply temperature, has elapsed; If the predetermined first time t1 has not elapsed, the previous step is repeated. If the predetermined first time t1 has elapsed, the lowest temperature among the hot water supply temperatures detected during the predetermined first time t1 is a direct water temperature (Tin ℃). Confirming); Calculating the temperature difference (T ° C) by subtracting the determined direct water temperature (Tin ° C) from the user's set temperature (Tset ° C); Is the temperature difference (T ° C) calculated above is less than a predetermined first temperature (A ° C), a temperature between a first temperature (A ° C) or more and less than a predetermined second temperature (B ° C), or a second temperature (B ° C) ) Continuously determining whether or not abnormalities; As a result of the comparison, if the temperature difference (T ° C.) is less than the determined first temperature (A ° C.), the combustion amount of the combustion unit is continuously controlled to the current combustion amount (Q 2), and the second temperature (B) determined by the first temperature (A ° C.) or more. If the temperature is less than the maximum combustion amount of the hot water heater at a temperature of less than the maximum combustion amount of the water heater, the combustion amount of the combustion unit is increased and controlled.If the temperature is higher than the second temperature (B ℃), the third combustion amount is smaller than the maximum combustion amount of the water heater. And increasing and controlling the combustion amount of the combustion unit by the fourth combustion amount Q4 larger than Q3.

In this case, the predetermined first time t1 is 3-6 seconds, and the predetermined second time t2 is 0.05-0.2 seconds.

In addition, the above-mentioned first temperature (A ℃) is 8-10 ℃, the second temperature (B ℃) is characterized in that 18-20 ℃.

In addition, the third combustion amount Q3 defined above is smaller than the fourth combustion amount Q4 determined, and the third combustion amount Q3 is 1/3 the combustion amount compared to the maximum combustion amount of the water heater, and the fourth combustion amount Q4 is determined. ) Is 2/3 of the maximum combustion amount of the water heater.

As described above, according to the method for controlling the initial combustion amount of hot water of the hot water heater of the present invention, when the hot water temperature is controlled by one of the hot water supply temperature sensors because the necessary elements are not sufficiently provided, the initial combustion amount of the hot water heater is close to the required control combustion amount Q after the initial ignition. According to the difference between the set temperature and the inlet temperature set by the control unit, the combustion amount Q is controlled with different combustion amount Q as initial values to increase the heating rate of the hot water temperature, and proportionally corrected combustion amount P and Overshoot and undershoot can be solved by setting the integral correction combustion amount (I) to an appropriate value, and also continuously update the temperature change of the hot water supply temperature sensor for a certain period of time starting from the initial use of hot water. The hot water temperature can be quickly reached to the set temperature by confirming the minimum temperature of the inputted temperature as the inlet temperature (direct water temperature). Air will be very useful inventions, including one that can provide users with good quality water.

1 is a schematic block diagram of a hot water heater control circuit to which the method of the present invention is applied.
2 is a flowchart for explaining the method of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a schematic block diagram of a hot water heater control circuit to which the method of the present invention is applied, and FIG. 2 shows a flowchart for explaining the method of the present invention.

According to this, the initial combustion amount control method of using hot water of the hot water heater of the present invention,

A combustion unit 1 for burning fuel, a blower 2 for supplying combustion air to the combustion unit 1, a heat exchanger for heat-exchanging heat and water obtained by combustion of the fuel, and a temperature; An adjusting device 3 for setting a lamp, a tapping temperature sensor 5 for detecting the tapping temperature of the heat exchanger, a water flow detecting sensor 6 for detecting the water flow, and a control unit 7 for performing an overall control operation of the hot water heater. In the initial combustion amount control method of using hot water of the hot water heater with

Igniting the combustion unit 1 when water flow is detected due to the use of hot water (S1);

Performing normal combustion amount control at a predetermined minimum heat amount Q1 (S2);

At step S3, the hot water supply temperature is continuously detected through the tapping temperature sensor 5 and stored in the controller 7 at a predetermined second time t2 interval for a predetermined first time t1, and the minimum temperature is updated (S3). Wow;

 Determining whether a predetermined first time t1, which is a minimum temperature update time with respect to the hot water supply temperature, has elapsed (S4);

If the predetermined first time t1 has not elapsed, the previous step S3 is repeated. If the predetermined first time t1 has elapsed, the lowest temperature of the hot water supply temperature detected during the predetermined first time t1 is a direct water temperature. Confirming (Tin ° C.) (S5);

Calculating a temperature difference (T ° C.) by subtracting the determined direct temperature (Tin ° C.) from the user's set temperature (Tset ° C.) (S6);

Is the temperature difference (T ° C) calculated above is less than a predetermined first temperature (A ° C), a temperature between a first temperature (A ° C) or more and less than a predetermined second temperature (B ° C), or a second temperature (B ° C) Step (S7-S9) to continuously determine whether or not);

As a result of the comparison, if the temperature difference (T ° C.) is less than the predetermined first temperature (A ° C.), the combustion amount of the combustion unit 1 is continuously controlled to the current combustion amount Q 2 (S10), and the first temperature (A ° C.) If the temperature is less than the predetermined second temperature (B ° C), the combustion amount of the combustion unit 1 is increased and controlled by the third combustion amount Q3 smaller than the maximum combustion amount of the hot water heater (S11), and the second temperature (B). ℃) is greater than the maximum amount of combustion of the water heater and the control unit (S12) by increasing the amount of combustion of the combustion unit 1 to a fourth amount of combustion (Q4) larger than the third amount of combustion (Q3); .

In this case, the predetermined first time t1 is 3-6 seconds, and the predetermined second time t2 is 0.05-0.2 seconds.

In addition, the above-mentioned first temperature (A ℃) is 8-10 ℃, the second temperature (B ℃) is characterized in that 18-20 ℃.

In addition, the third combustion amount Q3 defined above is smaller than the fourth combustion amount Q4 determined, and the third combustion amount Q3 is 1/3 the combustion amount compared to the maximum combustion amount of the water heater, and the fourth combustion amount Q4 is determined. ) Is 2/3 of the maximum combustion amount of the water heater.

Here, reference numeral 8 denotes a flame detection sensor, and 9 denotes a fan driving device.

Referring to the effects of the initial combustion amount control method of using hot water of the hot water heater of the present invention made as described above are as follows.

First, the present invention, the control unit 7 performing the overall control function of the hot water heater through a predetermined program continues to determine whether the water flow is detected due to the user's use of hot water through the water flow detection sensor 6, if the water flow is detected, the gas The valve is opened and the igniter is operated to ignite the combustion unit 1 (S1).

After the ignition operation is performed as described above, the control unit 7 determines whether the ignition is accurate through the flame detection sensor 8, and when the normal ignition is performed, the control unit 7 determines the minimum amount of heat Q1 set in the control unit 7. The combustion unit 1 performs normal combustion amount control (S2).

Thereafter, the controller 7 continuously detects the hot water supply temperature through the tapping temperature sensor 5 at a predetermined second time t2 interval for the first time t1 that is already set in the timer in the controller 7. The memory is kept in the storage device and the minimum temperature is updated (S3).

In this case, the predetermined first time t1 is set to 3-6 seconds, and the predetermined second time t2 is set based on the data obtained through the test as 0.05-0.2 seconds, which constitutes the controller 7. The present invention is not limited thereto because it can be changed depending on the performance of the microcomputer.

Subsequently, the controller 7 determines whether the predetermined first time t1, which is the minimum temperature update time for the hot water supply temperature, has elapsed (S4), and if the predetermined first time t1 has not elapsed, the previous step. Repeatedly performing (S3) and continuously updating the minimum temperature, and if the predetermined first time t1 has elapsed, the lowest temperature among the hot water supply temperatures detected during the predetermined first time t1 is the inflow temperature of the direct water, that is, the direct water temperature ( Tin ℃) is determined (S5).

In the above detection of the intake temperature, the temperature of the hot water supply temperature sensor is determined as the intake temperature from the initial use of hot water, and in the case of the initial combustion state, it is not a problem if the intake temperature is determined as the intake temperature, When the hot water stagnated in the heat exchanger is tapping, it is difficult to determine the tapping temperature as the intake temperature immediately, and then the temperature change is detected after a predetermined first time (t1; for example, 3-6 seconds). The lowest temperature in the temperature during the time was determined as the direct water temperature (Tin ℃).

Subsequently, the control unit 7 calculates the temperature difference T ° by subtracting the direct water temperature Tin ° C determined above from the set temperature Tset ° C set by the user using the adjusting device 3 (S6). Then, whether the temperature difference (T ° C.) calculated above is less than the first temperature (A ° C.) determined, a temperature between the first temperature (A ° C.) and less than the second temperature (B ° C.) determined or more, or the second temperature It is continuously determined whether or not (B ° C) or more (S7-S9).

As such, the result of comparing the temperature difference (T ° C) of the direct water temperature (Tin ° C) determined by the control unit 7 with respect to the set temperature (Tset ° C) and the first temperature (A ° C) and the second temperature (B ° C). If the temperature difference (T ° C.) is less than the predetermined first temperature (A ° C.), the combustion amount of the combustion unit 1 is continuously controlled to the current combustion amount Q 2 (S10), and the second temperature determined to be equal to or greater than the first temperature (A ° C.). If the temperature is lower than the temperature (B ° C), the combustion amount point of the combustion unit 1 is increased to the third combustion amount Q3 smaller than the maximum combustion amount of the hot water heater, and the combustion amount is controlled to the initial value (S11). If the temperature is equal to or greater than the second temperature (B ° C.), the combustion amount point of the combustion unit 1 is increased to a fourth combustion amount Q4 smaller than the maximum combustion amount of the water heater and larger than the third combustion amount Q3, and the value is set to an initial value. Combustion amount control is performed (S12).

That is, in the present invention, the combustion temperature is controlled by setting the minimum combustion amount Q1 as the initial value until the minimum temperature (Tin ℃) is determined after the initial ignition, and then the set temperature after the minimum temperature (Tin ℃) is determined. The combustion amount is controlled by changing the combustion amount according to the temperature difference between the temperature of Tset and T.

At this time, the first temperature (A ℃) determined above was set to 8-10 ℃, and the second temperature (B ℃) was set to 18-20 ℃, which is the optimum temperature through the experiment to calculate each Since it may vary depending on the water heater capacity, it is not limited thereto.

In addition, the third combustion amount Q3 defined above is smaller than the fourth combustion amount Q4 determined, and the third combustion amount Q3 is set to 1/3 the combustion amount compared to the maximum combustion amount of the water heater, and the predetermined fourth combustion amount is set. (Q4) is set to 2/3 the amount of combustion compared to the maximum amount of combustion of the hot water heater, which is also calculated by the optimum control combustion amount through the experiment, and may not be limited to each of the hot water heater capacity and so on.

In other words, in the present invention, for example, when the temperature difference (T ° C) of the direct water temperature (Tin ° C) determined compared to the user set temperature (Tset ° C) is less than 8-10 ° C (A ° C), the combustion amount determined as the current minimum temperature. If the temperature difference (T ° C) is greater than or equal to 8-10 ° C (A ° C) and less than 18-20 ° C (B ° C), one third of the maximum combustion amount ( Combustion amount control is performed at the initial value of Q3), and when the temperature difference (T ° C) is greater than or equal to 20 ° C (B ° C), the combustion amount control is performed at an initial value of 2/3 (Q4) of the maximum combustion amount.

Therefore, the initial hot water temperature heating speed can be increased, and the proportionally corrected combustion amount P and the integrally corrected combustion amount I can be set to a constant value so that overshoot and undershoot do not occur, thereby supplying the hot water temperature quickly and stably. .

It should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

1: combustion part 2: blower
3: adjusting device 5: tapping temperature sensor
6: water flow detection sensor 7: control unit
8: flame detection sensor 9: fan drive device
10: gas supply driving device

Claims (5)

In the initial combustion amount control method of using hot water of the hot water heater,
Igniting the combustion unit when water flow is detected due to the use of hot water, and performing normal combustion amount control with a predetermined minimum heat quantity Q1;
Continuously detecting and storing hot water supply temperature at a predetermined second time t2 interval for a predetermined first time t1 and updating a minimum temperature;
Determining whether a predetermined first time t1 has elapsed;
When the predetermined first time t1 has elapsed, determining a minimum temperature of the hot water supply temperature detected during the predetermined first time t1 as a direct water temperature Tin ℃;
Calculating the temperature difference (T ° C) by subtracting the determined direct water temperature (Tin ° C) from the user's set temperature (Tset ° C);
Is the temperature difference (T ° C) calculated above is less than a predetermined first temperature (A ° C), a temperature between a first temperature (A ° C) or more and less than a predetermined second temperature (B ° C), or a second temperature (B ° C) ) Continuously determining whether or not abnormalities;
As a result of the comparison, if the temperature difference (T ° C.) is less than the determined first temperature (A ° C.), the combustion amount of the combustion unit is continuously controlled to the current combustion amount (Q 2), and the second temperature (B) determined by the first temperature (A ° C.) or more. If the temperature is less than (℃ ℃) by increasing the combustion amount to the third combustion amount (Q3) determined to be smaller than the maximum combustion amount of the water heater, and if the second temperature (B ℃) or less than the maximum combustion amount and greater than the third combustion amount (Q3). The method of controlling the initial combustion amount of hot water using the hot water heater, further comprising the step of: increasing and controlling the combustion amount to a predetermined fourth combustion amount Q4.
delete The method according to claim 1,
The predetermined first time t1 is a predetermined time between 3-6 seconds, and the predetermined second time t2 is a predetermined time between 0.05 and 0.2 seconds.
The method according to claim 1,
The predetermined first temperature (A ℃) is a predetermined temperature between 8-10 ℃, the second temperature (B ℃) is a predetermined temperature between 18-20 ℃ hot water use of the hot water control method of the hot water heater.
The method according to claim 1,
The predetermined third combustion amount Q3 is 1/3 the combustion amount compared to the maximum combustion amount of the water heater, and the predetermined fourth combustion amount Q4 is the combustion amount of the hot water using the hot water heater, characterized in that 2/3 combustion amount compared to the maximum combustion amount of the water heater. Control method.

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