KR101261150B1 - Method for controlling heated water supply in hot-water supply device - Google Patents

Abstract

The present invention relates to a method for controlling hot water supply of a hot water heater, in particular, a process of igniting a combustion unit when water flow is detected due to the use of hot water; Calculate the actual amount of combustion Q to be controlled by adding the feed forward combustion amount QFF, heat exchange capacity correction combustion amount K, air-fuel ratio correction combustion amount T, proportional correction combustion amount P, and integral correction combustion amount I. Process; Calculate the difference (△ T1) between the user's set temperature (Ts) and the inlet temperature (Ti) and the difference (△ T2) between the set temperature (Ts) and the tapping temperature (To). Calculating B); Determining whether the calculated proportional variable (B) is greater than "1"; Determining whether the proportional variable B is greater than a predetermined maximum value as a result of the determination; Calculating a new combustion amount Q by multiplying the previously calculated combustion amount Q when the proportional variable B is smaller than the maximum value as a result of the determination; Supplying a fuel having a quantity corresponding to the newly calculated combustion amount Q to the combustion unit; After determining whether the water flow detection "off" signal is input and returning to the process of calculating an initial combustion amount Q when the water flow detection "off" signal is not input, extinguishing when the water flow detection "off" signal is input; Characterized in that consisting of.
As described above, in the present invention, it is possible to quickly and accurately control the amount of combustion for the hot water supply in the hot water supply machine, thereby increasing the speed of hot water supply and providing a stable hot water supply. By providing a hot water can be reached quickly to the set temperature.

Description

Method for controlling heated water supply in hot-water supply device

The present invention relates to a method for controlling hot water supply of a hot water heater, and more particularly, to enable a rapid and accurate control of the amount of combustion for hot water supply in a hot water heater, thereby to speed up the hot water supply and to provide a stable hot water supply. In addition, by providing a proportional variable to a value for calculating the initial combustion amount of hot water use, the hot water can be quickly reached to the set temperature.

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

On the other hand, the fuel regulator (e.g., 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.

However, if the combustion amount is changed by the feedforward control, such as when the set temperature is changed, or when the inlet temperature and the quantity are changed, the influence of the residual heat amount due to the heat capacity of the heat exchanger exchanging heat and water passing through the combustion. As a result, the tapping temperature set by the user is not obtained until the heat exchanger reaches the thermal equilibrium.

In addition, since the control of the air-fuel ratio is performed by the amount of fuel supplied, when the amount of fuel supplied by the air-fuel ratio correction changes, the amount of heat obtained is changed. For this reason, the tapping temperature set by the user may not be obtained by the air-fuel ratio correction.

That is, determining the combustion amount only by the conventional feedforward control has a problem that the tapping temperature set by the user cannot be obtained due to each error.

Therefore, Korean Patent Publication No. 194-4181, "Combustion amount control device for a hot water heater", has been proposed as a solution for solving the above problems, which is a combustion unit for burning fuel and air for combustion. In a hot water heater having a heat exchanger that heats water by heat-exchanging heat and water obtained by combustion of a blower and fuel to be supplied, a combustion amount control apparatus of a hot water heater, which controls the amount of combustion by controlling the blow amount of the blower, by a controller. The tapping temperature is calculated by multiplying the difference between the set temperature Ts and the inlet temperature Ti detected by the inlet temperature sensor, the quantity of water detected by the quantity sensor, and the heat exchange efficiency of the heat exchanger (l / eff). Feedforward combustion amount calculating means for calculating a feedforward combustion amount required to maintain the set temperature; 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 the 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, in order to determine the combustion amount Q, 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 correction The combustion amount I is added to determine the combustion amount 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 detecting 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 preset 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).

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 controller, 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 controller, 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).

In the formula (1), the calculation of the integrally corrected combustion amount (I) 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 proportionating the change amount of the integrally corrected combustion amount I with 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.

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.

The present invention has been made in order to solve such a conventional problem, it is possible to perform a precise amount of combustion for hot water supply in a hot water heater, while accurately performing the hot water supply speed and stable hot water supply, It is also an object of the present invention to provide a method of controlling hot water supply of a hot water heater which can provide hot water to a predetermined temperature by providing a proportional variable to a value for calculating an initial combustion amount of hot water.

Hot water supply control method of the hot water heater of the present invention for solving the above problems, the combustion unit for burning the fuel, a blower for supplying the combustion air to the combustion unit, heat and water obtained by the combustion of the fuel heat exchange Heat exchanger for heating water, adjusting device for setting temperature, inlet temperature sensor for detecting inlet temperature, tapping temperature sensor for detecting tapping temperature of heat exchanger, water and quantity for detecting water flow and quantity A hot water supply control method of a hot water heater comprising a sensor and a control unit which performs an overall control operation of the hot water heater, the method comprising: igniting a combustion unit when water flow is detected due to the use of hot water; Calculate the actual amount of combustion Q to be controlled by adding the feed forward combustion amount QFF, heat exchange capacity correction combustion amount K, air-fuel ratio correction combustion amount T, proportional correction combustion amount P, and integral correction combustion amount I. Process; Calculate the difference (△ T1) between the user's set temperature (Ts) and the inlet temperature (Ti) and the difference (△ T2) between the set temperature (Ts) and the tapping temperature (To). Calculating B); Determining whether the calculated proportional variable (B) is greater than "1"; Determining whether the proportional variable B is greater than a predetermined maximum value as a result of the determination; Calculating a new combustion amount Q by multiplying the previously calculated combustion amount Q by the value if the proportional variable B is not larger than the maximum value as a result of the determination; Supplying a fuel having a quantity corresponding to the newly calculated combustion amount Q to the combustion unit; After determining whether the water flow detection "off" signal is input and returning to the process of calculating an initial combustion amount Q when the water flow detection "off" signal is not input, extinguishing when the water flow detection "off" signal is input; Characterized in that consisting of.

At this time, the formula for calculating the proportional variable (B) is {(set temperature (Ts)-inlet temperature (Ti)) + proportionality constant (k) X (set temperature (Ts)-tapping temperature (To))} / ( It is characterized in that the set temperature (Ts)-inlet temperature (Ti)).

In the above, the proportional constant k is set to 0.2.

In addition, if the proportional variable (B) calculated above is not greater than "1", setting the proportional variable (B) to "1" and multiplying it by the previously calculated combustion amount (Q) yields a new combustion amount (Q). It features.

In addition, if the proportional variable (B) is larger than the maximum value as a result of the above determination, it is characterized by setting the proportional variable (B) to the maximum value and multiplying it by the previously calculated combustion amount (Q) to calculate a new combustion amount (Q). .

As described above, according to the hot water supply control method of the hot water heater of the present invention, the hot water supply speed can be increased and the stable hot water supply can be achieved by quickly and accurately controlling the amount of combustion for hot water supply in the hot water heater. In addition, by providing a proportional variable to the value for calculating the initial combustion amount of hot water use, it is a very useful invention, such as to quickly reach the hot water to the set temperature.

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.

Accordingly, the hot water supply control method 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, an inlet temperature sensor 4 for detecting the inlet temperature, a tapping temperature sensor 5 for detecting the tapping temperature of the heat exchanger, and a water flow / amount for detecting the water flow and quantity In the hot water supply control method of the hot water heater having a sensor (6) and a control unit (7) for performing the overall control operation of the hot water heater,

Igniting the combustion unit 1 in the control unit 7 when the water flow is detected by the water flow / quantity detection sensor 6 due to the use of hot water by the user;

The combustion amount actually controlled by the controller 7 by adding the feedforward combustion amount QFF, heat exchange capacity correction combustion amount K, air-fuel ratio correction combustion amount T, proportional correction combustion amount P, and integral correction combustion amount I. Calculating (Q);

Subsequently, the difference (ΔT1), the set temperature (Ts), and the tapping between the hot water set temperature (Ts) set by the user using the operating device (3) and the inlet temperature (Ti) detected by the inlet temperature sensor (4). Obtaining a difference [Delta] T2 between the tapping temperature To of hot water detected by the temperature sensor 5;

Calculating a proportional variable (B) using a predetermined formula;

Determining whether the calculated proportional variable (B) is greater than "1";

Determining whether the proportional variable B is greater than a predetermined maximum value as a result of the determination;

Calculating the new combustion amount Q by multiplying the previously calculated combustion amount Q by the value if the proportional variable B is larger than "1" but smaller than the maximum value;

Supplying the combustion unit 1 with a fuel corresponding to the newly calculated combustion amount Q;

Thereafter, it is determined whether the water flow detection "off" signal is input. If the water flow detection "off" signal is not input, the flow returns to the process of calculating an initial combustion amount Q. When the water flow detection "off" signal is input, the gas supply driving device is input. The process of extinguishing by cutting off the fuel supply through the (10).

At this time, the formula for calculating the proportional variable (B) is {(set temperature (Ts)-inlet temperature (Ti)) + proportionality constant (k) X (set temperature (Ts)-tapping temperature (To))} / ( It is characterized in that the set temperature (Ts)-inlet temperature (Ti)).

In the above, the proportional constant k is set to 0.2.

In addition, if the proportional variable (B) calculated above is not greater than "1", setting the proportional variable (B) to "1" and multiplying it by the previously calculated combustion amount (Q) yields a new combustion amount (Q). It features.

When the proportional variable B is larger than the maximum as a result of the determination, the new combustion amount Q is calculated by setting the proportional variable B to the maximum value and multiplying it by the previously calculated combustion amount Q. It is done.

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

Referring to the effect of the hot water supply control method of the hot water heater of the present invention made as described above are as follows.

First, in the present invention, the control unit 7 which performs the overall control function of the hot water heater through a predetermined program continuously determines whether the water flow is detected due to the use of hot water of the user through the water flow / water flow detection sensor 6 so that the water flow is detected. When the gas valve is opened, the igniter is operated to ignite the combustion unit 1.

After performing the ignition operation as described above, the control unit 7 determines whether the ignition is accurate by the flame detection sensor 8, and when the normal ignition is performed, the feedforward combustion amount QFF and the heat exchange capacity correction combustion amount K The calculated combustion amount Q = QFF + K + T + P + I is calculated by adding the air-fuel ratio corrected combustion amount T, the proportional corrected combustion amount P, and the integral corrected combustion amount I.

In the control unit 7 that calculates the initial combustion amount Q as described above, the hot water set temperature Ts set by the user using the control device 3 and the inlet temperature Ti detected by the inlet temperature sensor 4 are subsequently set. ) Calculates the difference (△ T1) and the difference between the set temperature (Ts) and the tapping temperature (To) of the hot water detected by the tapping temperature sensor (5), and then using the formula (B) is calculated.

At this time, the formula for calculating the proportional variable (B) is {(set temperature (Ts)-inlet temperature (Ti)) + proportionality constant (k) X (set temperature (Ts)-tapping temperature (To))} / ( It is designed as set temperature (Ts) -intake temperature (Ti), where the proportional constant k is about 0.2.

The proportionality constant (B) can be obtained using this formula:

For example, if the tap water temperature (Ti) is 20 ° C. and the tap water temperature (To) is 20 ° C. while the set temperature Ts is 40 ° C. If {(40-20) + 0.2 X (40-20)} / (40-20) = 1.200, and tapping temperature (To) is 40 ℃, proportional constant (B) is 1.000, tapping temperature (To) Is 60 ° C., the proportionality constant B becomes 0,8000. In this case, the proportionality constant B is set to “1”.

That is, B applied in the present invention is a value calculated by the set temperature (Ts), the intake temperature (Ti) and the tapping temperature (To) as a proportional variable, and when the difference between the set temperature (Ts) and the tapping temperature (To) is large, It has been invented to have a constant drainage value, and the difference between the set temperature and the tapping temperature becomes smaller, so that the drainage value becomes smaller. If greater than or equal to, it is invented to have a value of "1".

Meanwhile, when the proportional constant B is obtained through the above-described formula, the controller 7 determines whether the calculated proportional variable B is greater than "1", and if the value is greater than "1", If it is greater than the determined maximum value, and if it is not greater than the maximum value, the value is multiplied by the previously calculated combustion quantity Q (that is, (QFF + K + T + P + I) XB) to obtain a new combustion quantity Q. Will be calculated.

However, as a result of the above determination, if the proportional variable B calculated by the determined formula is not larger than "1", the proportional variable B is set to "1" and multiplied by the previously calculated combustion amount Q to obtain a new combustion amount ( Q) is calculated.

When the proportional variable B is larger than the maximum value as a result of the determination, the new combustion amount Q is calculated by setting the proportional variable B to the maximum value and multiplying it by the previously calculated combustion amount Q.

Here, the maximum value is determined by the proportional constant (k) applied in the formula for calculating the proportional variable (B), for example, when the proportional constant k is limited to 0.2 as described above, the maximum of the proportional variable (B) The value is 1.2.

Subsequently, the controller 7 continuously determines whether the water flow detection "off" signal is input, and if the water flow detection "off" signal is not input, returns to the process of calculating the initial combustion amount Q and repeats the subsequent process. If the flow detection "off" signal is input, the fuel supply is cut off through the gas supply driving device 10 to extinguish and terminate.

As described above, in the present invention, the method of multiplying the proportional variable (B) calculated by the set temperature (Ts), the intake temperature (Ti), the tapping temperature (To), and the proportional constant (k) when obtaining the combustion amount (Q) Since it is possible to quickly and accurately control the amount of combustion for hot water supply in a hot water heater, it is possible not only to increase the speed of hot water supply but also to provide stable hot water supply, and to calculate the initial amount of combustion of hot water as described above. By providing a variable, hot water can be reached quickly to a set temperature.

On the other hand, the description so far has described the hot water supply control method in the hot water heater equipped with both the inlet temperature sensor (4) and the water flow / quantity detection sensor (6), but is not limited to this, if the inlet temperature detection device In the case of a hot water heater without an inlet temperature sensor, an inlet temperature estimating means for estimating the temperature of the water flowing into the heat exchanger is provided, and the inlet temperature is first determined before the inlet temperature is combusted, and then the present invention is applied. By doing so, the hot water supply combustion amount can be accurately calculated.

In addition, even in a hot water heater without a water flow / quantity detection sensor, which is a flow rate detection device, if only a flow estimating means for estimating the flow rate of water passing through the heat exchanger is provided, the amount of combustion can be accurately calculated by applying the present invention. have.

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 4: inlet temperature sensor
5: tapping temperature sensor 6: water flow / quantity detection sensor
7: control unit 8: flame detection sensor
9: fan drive device 10: gas supply drive device

Claims (5)

In the hot water supply control method of the hot water heater,
Igniting the combustion section when water flow is detected due to the use of hot water;
Calculate the actual amount of combustion Q to be controlled by adding the feed forward combustion amount QFF, heat exchange capacity correction combustion amount K, air-fuel ratio correction combustion amount T, proportional correction combustion amount P, and integral correction combustion amount I. Process;
Calculate the difference (△ T1) between the user's set temperature (Ts) and the inlet temperature (Ti) and the difference (△ T2) between the set temperature (Ts) and the tapping temperature (To). Calculating B);
Determining whether the calculated proportional variable (B) is greater than "1";
Determining whether the proportional variable B is greater than a predetermined maximum value as a result of the determination;
Calculating a new combustion amount Q by multiplying the previously calculated combustion amount Q by the value if the proportional variable B is larger than "1" but smaller than the maximum value;
Supplying a fuel having a quantity corresponding to the newly calculated combustion amount Q to the combustion unit;
After determining whether the water flow detection "off" signal is input and returning to the process of calculating an initial combustion amount Q when the water flow detection "off" signal is not input, extinguishing when the water flow detection "off" signal is input; Consisting of
The predetermined formula for calculating the proportional variable (B) is {(set temperature (Ts)-inlet temperature (Ti)) + proportional constant (k) X (set temperature (Ts)-tapping temperature (To))} / (set Temperature (Ts)-inlet temperature (Ti)).
delete The method according to claim 1,
The proportional constant k is set to 0.2 hot water supply control method of the hot water heater.
The method according to claim 1,
If the proportional variable B is not greater than "1" as a result of the determination, the new combustion amount Q is calculated by setting the proportional variable B to "1" and multiplying it by the previously calculated combustion amount Q. Hot water supply control method of the hot water heater.
The method according to claim 1,
When the proportional variable B is larger than the maximum value as a result of the determination, the new combustion amount Q is calculated by setting the proportional variable B to the maximum value and multiplying it by the previously calculated combustion amount Q. Hot water supply control method of hot water heater.

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