KR19980054866A - Hot water temperature control method using heating water temperature - Google Patents

Abstract

The present invention relates to a method of controlling a hot water temperature of a gas boiler, and more particularly, to control a hot water temperature by using a temperature of a heating supply water measured by a heating water temperature sensor used without a hot water temperature sensor. It relates to a hot water temperature control method.

The hot water temperature control method using the heating water supply temperature of the present invention, by detecting the hot water set temperature (K) set by the user and by measuring the heating water supply temperature (T) from the temperature sensor (29) temperature difference (ΔT = KT Calculating a first step; When the temperature difference (ΔT = KT) is 10 ° C. or more, the heating power is maximized and when it is -10 ° C. or more, the heating power is minimized. Normally, the heating supply water temperature T is ± ± of the hot water set temperature K. A second step of maintaining a heated state until reaching a range of 0.5 ° C .; A third step of detecting whether the current thermal power state is a maximizing force, a minimizing force, or a normal thermal power when the heating supply water temperature T is within a range of ± 0.5 ° C; A fourth step of maximizing power to reduce the firepower by 1/2 and minimizing power to increase the fire power by 1/2 to maintain the state; If the hot water set temperature (K) is greater than the heating water supply temperature (T) by determining the temperature difference (ΔT = KT) and maintaining the changed thermal power in the fourth step, it is determined whether the temperature rises and the hot water set temperature (K) is supplied with heating. A fifth step of determining whether the temperature is reduced when the water temperature is less than T; When the temperature rises in the fifth step, if the thermal power is changed and the thermal power is changed and the thermal power is changed, the thermal power is reduced by 1/2 to the change width, and if the thermal power is not changed, the thermal power is maintained and the temperature is lowered. A sixth step of detecting a change in thermal power relative to the initial power and increasing the thermal power by 1/2 if the thermal power is changed, and increasing the thermal power by the thermal power change if it is not changed; And if the temperature decreases in the fifth step, detecting the thermal power detection range for the initializing power, if the thermal power is changed, increase the thermal power by 1/2 with respect to the thermal power change width, and maintain the current thermal power if the thermal power is not changed. If the rise is detected by the change in the thermal power, if the thermal power is changed, the thermal power is reduced by 1/2 to the thermal power change, and if the thermal power is not changed, it comprises a seventh step of reducing the thermal power by the thermal power change.

Description

Hot water temperature control method using heating water temperature

The present invention relates to a method of controlling a hot water temperature of a gas boiler, and more particularly, to control a hot water temperature by using a temperature of a heating supply water measured by a heating water temperature sensor used without a hot water temperature sensor. It relates to a hot water temperature control method.

1 is a schematic configuration diagram of a gas boiler conventionally used.

When the gas boiler is operated (including the main control part in which the actual boiler control program is stored), the control panel 3 opens the gas valve 1 to an appropriate level based on setting data such as heating temperature or hot water temperature by the user. And supplies a control signal to maintain the rotational speed of the exhaust fan 15 at a predetermined rotational speed. The gas supplied through the gas valve 1 rises after burning in the burner 5 to heat the heat exchanger 11. The heat exchanger 11 is filled with heating water, and when heated by external heat and reaches a predetermined temperature, the heat exchanger 11 circulates to the heating supply pipe 21 for heating. At this time, the circulation pump 17 is always operated at a high speed for circulation of the heating water. The high temperature heating water circulating is introduced into the water tank 25 through the heating return pipe 23 after dissipating heat while passing through the room. The introduced heating water is again introduced into the heat exchanger 11 by selecting the flow path of the three-way valve 19 to be heated again. The exhaust gas generated after the combustion is discharged to the outside through the exhaust flue 13 above the heat exchanger 11.

On the other hand, when using hot water, cold water of low temperature is introduced through the direct water supply pipe 27. Since the direct water supply pipe 27 is configured to pass through the inside of the heat exchanger 11, the low temperature direct water is circulated to increase in temperature, and finally hot water is heated with high temperature. In the above description, in the heating and hot water modes, the movement of the heating water is controlled by the three-way valve 19. In addition, the temperature of the heating water is measured by the temperature sensors 29 and 31, respectively, and the main control part (not shown) adjusts the combustion stroke in the burner 5 with reference to the temperature data.

In order to accurately control the tapping temperature of the hot water in the boiler as described above, a temperature sensor (not shown) is used on the hot water supply side of the direct water supply pipe 27. However, the temperature sensor is an expensive component, and it is a cost increase factor, so it is mainly used for high-end gas boilers, and low-cost boilers use the heating water temperature. It's bad.

The present invention has been made to solve the above problems, the object of the present invention is to use hot water temperature using the heating water supply temperature that can accurately control the hot water temperature using the heating water supply temperature without using the hot water temperature sensor It is to provide a temperature control method.

Hot water temperature control method using the heating water supply temperature of the present invention for achieving the above object, detects the hot water set temperature (K) set by the user and measure the heating water supply temperature (T) from the temperature sensor 29 Calculating a temperature difference (ΔT = KT); When the temperature difference (ΔT = KT) is 10 ° C. or more, the heating power is maximized and when it is -10 ° C. or more, the heating power is minimized. Normally, the heating supply water temperature T is ± ± of the hot water set temperature K. A second step of maintaining a heated state until reaching a range of 0.5 ° C .; A third step of detecting whether the current thermal power state is a maximizing force, a minimizing force, or a normal thermal power when the heating supply water temperature T is within a range of ± 0.5 ° C; A fourth step of maximizing power to reduce the firepower by 1/2 and minimizing power to increase the fire power by 1/2 to maintain the state; If the hot water set temperature (K) is greater than the heating water supply temperature (T) by determining the temperature difference (ΔT = KT) and maintaining the changed thermal power in the fourth step, it is determined whether the temperature rises and the hot water set temperature (K) is supplied with heating. A fifth step of determining whether the temperature is reduced when the water temperature is less than T; When the temperature rises in the fifth step, if the thermal power is changed and the thermal power is changed and the thermal power is changed, the thermal power is reduced by 1/2 to the change width, and if the thermal power is not changed, the thermal power is maintained and the temperature is lowered. A sixth step of detecting a change in thermal power relative to the initial power and increasing the thermal power by 1/2 if the thermal power is changed, and increasing the thermal power by the thermal power change if it is not changed; And if the temperature decreases in the fifth step, detecting the thermal power detection range for the initializing power, if the thermal power is changed, increase the thermal power by 1/2 with respect to the thermal power change width, and maintain the current thermal power if the thermal power is not changed. If is increased, the thermal power is detected and the thermal power is changed. If the thermal power is changed, the thermal power is reduced by 1/2 to the thermal power change, and if the thermal power is not changed, the seventh step is to reduce the thermal power by the thermal power.

1 is a schematic configuration diagram of a gas boiler conventionally used;

2 is a partial block circuit diagram of the gas boiler of FIG.

3 is a flowchart illustrating a boiler operating method for protecting a heat exchanger of the present invention.

4 is a graph for explaining the change in thermal power of the hot water temperature control method according to the method of the present invention.

Explanation of symbols for the main parts of the drawings

1: gas valve, 3: control panel,

5: burner, 7: spark plug,

9: flame detector, 11: heat exchanger,

13: exhaust year, 15: exhaust fan,

17: circulation pump, 19: three-way valve,

21: heating supply pipe, 23: heating return pipe,

25: water tank, 27: water supply pipe,

29, 31: temperature sensor, 33: main control part,

Hereinafter, a hot water temperature control method using the heating water supply temperature of the present invention with reference to the accompanying drawings in detail as follows.

The method of the present invention is to control the hot water temperature by using the heating water supply temperature without using the hot water temperature sensor, and compares the heating water supply temperature (T) with the hot water set temperature (K) set by the user. In this case, the heating water temperature is increased in the shortest time, and when the heating supply water temperature approaches the hot water set temperature (K), a precise temperature control is performed to control the hot water temperature. Therefore, according to the method of the present invention, the hot water temperature does not overheat and reaches the set hot water temperature in a short time.

The method of the present invention as described above, the step of first detecting the hot water set temperature (K) set by the user and measuring the heating supply water temperature (T) from the temperature sensor 29 to calculate the temperature difference (ΔT = KT) It starts from That is, the main controller 33 measures the heating water supply temperature T from the temperature sensor 29 installed in the heating water supply pipe 21 and reads the hot water set temperature K set by the user from the temperature data storage memory. Calculate the temperature difference (ΔT = hot water set temperature-heating feed water temperature: KT).

As described above, when the temperature difference ΔT = K-T is calculated, the main control section 33 takes a different control scheme according to each temperature setting range. That is, when the temperature difference is + 10 ° C. or higher, that is, when the hot water set temperature K is higher than the heating supply water temperature T, the heating is performed with a maximal force to increase the temperature of the heating water. This can be achieved by adjusting the gas valve 1 in the main control section 33 to maximize the gas pressure. In addition, if the temperature difference is -10 ° C or more, that is, the hot water set temperature (K) is 10 ° C or more lower than the heating supply water temperature (T) is heated with a minimum force to lower the temperature of the heating water. In addition, if a temperature difference exists between them, it heats by the conventionally set thermal power.

All of these heating states are stored in the main control section 33, and the heating state continues until the heating supply water temperature T reaches a range of ± 0.5 ° C of the hot water set temperature K. In the above step, the heating water is close to the set temperature in the fastest time.

When the heating supply water temperature T reaches a range of ± 0.5 ° C. of the hot water set temperature K, the main control unit 33 detects the current thermal power state. Since the thermal state is all stored in the above step, it can be easily determined. This is performed by sensing a voltage value (or current value) applied to the gas valve 1.

As described above, when the heating supply water temperature T reaches a range of ± 0.5 ° C. of the hot water set temperature K and the thermal power state is sensed, the main control unit 33 decreases the thermal power by 1/2 if the heating power is conventionally maximized. In other words, if it is heated to 20,000Kcal and the minimizing force is 12,000Kcal, the middle is 16,000Kcal. In addition, if the heating to the conventional minimizing power is increased by 1/2. That is, if the conventional 12,000Kcal and the maximum force is 20,000Kcal is 16,000Kcal. The thermal power change range in the above is 4,000 Kcal.

This thermal change process is to prevent the temperature from rising or falling abruptly. In the present invention, the hot water temperature is finely controlled in the state where the thermal power is set.

When the thermal power is changed as described above, the state of the temperature difference (ΔT = K-T) is detected. That is, it detects whether the temperature difference is a conventional (+) or (-) state and accordingly detects a temperature change of the heating water. The main controller 33 detects a temperature change by using the temperature sensor 29 installed to measure the temperature of the heating water.

Measure the temperature change for 1 second while the temperature difference is positive and if the temperature rises, detect the change in thermal power. This is a 4,000 Kcal firepower reduction. If the fire width does not change even when the temperature rises, the fire power in the current state is maintained. However, if there is a change in the thermal width, the thermal power is reduced by one half of the thermal change, and combustion continues. Thus, firepower is reduced by 2,000 Kcal. Firepower in this state is maintained.

If the measured temperature drops for 1 second while the temperature difference is positive, the change in thermal power is also detected. If the temperature decreases and there is no change in thermal power, the temperature drops and needs to be heated with more calories. At this time, the heating water is heated by increasing the thermal power of 1/2 the thermal power change range. If a change in thermal power occurs when the temperature falls, then heat the power by the change in thermal power again.

As a result of the change in thermal power, the temperature of the heating water is converged to the set temperature by changing the temperature in a state like a staircase.

Even when the temperature difference is negative, the main control unit 33 measures the temperature change for one second. At this time, if the measured temperature decreases, the change in thermal power is detected. If there is a change in the thermal power change range while the temperature decreases, the temperature is falling, so increase the power supply by 1/2 the thermal power change range and observe the temperature change trend. If there is a thermal change while the temperature decreases, maintain the thermal power and detect the temperature change.

If the measured temperature rises for 1 second while the temperature difference is negative, the change in thermal power is also detected. If there is no change in thermal power when the temperature rises, the thermal power is increased and the heat is reduced by 1/2 the change in heat since there is no need to heat more heat. If the change in thermal power does not occur when the temperature falls, then heat is reduced by the amount of thermal change.

As a result of the change in thermal power, the temperature of the heating water is converged to the set temperature by changing the temperature in a state like a staircase. Figure 4 shows the temperature change trend by the method of the present invention, the thermal power change width is reduced by half as the set temperature is reached to reach the set temperature in multiple stages. In the figure, the change trend in the case of ΔT10 ° C is shown, and in the case of ΔT-10 ° C, it can be seen that the change trend curve of the substitution is obtained around the set temperature.

As described above, according to the present invention, there is an advantage in that the hot water temperature can be accurately controlled by using the heating water supply temperature without using the hot water temperature sensor.

Although the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the invention, and such variations or modifications will belong to the appended claims. .

Claims (1)

A first step of detecting a hot water set temperature K set by a user and measuring a heating supply water temperature T from a temperature sensor 29 to calculate a temperature difference ΔT = K-T; When the temperature difference (ΔT = KT) is 10 ° C. or more, the heating power is maximized and when it is -10 ° C. or more, the heating power is minimized. Normally, the heating supply water temperature T is ± ± of the hot water set temperature K. A second step of maintaining a heated state until reaching a range of 0.5 ° C .; A third step of detecting whether the current thermal power state is a maximizing force, a minimizing force, or a normal thermal power when the heating supply water temperature T is within a range of ± 0.5 ° C; A fourth step of maximizing power to reduce the firepower by 1/2 and minimizing power to increase the fire power by 1/2 to maintain the state; If the hot water set temperature (K) is greater than the heating water supply temperature (T) by determining the temperature difference (ΔT = KT) and maintaining the changed thermal power in the fourth step, it is determined whether the temperature rises and the hot water set temperature (K) is supplied with heating. A fifth step of determining whether the temperature is reduced when the water temperature is less than T; When the temperature rises in the fifth step, if the thermal power is changed and the thermal power is changed and the thermal power is changed, the thermal power is reduced by 1/2 to the change width, and if the thermal power is not changed, the thermal power is maintained and the temperature is lowered. A sixth step of detecting a change in thermal power relative to the initial power and increasing the thermal power by 1/2 if the thermal power is changed, and increasing the thermal power by the thermal power change if it is not changed; And When the temperature decreases in the fifth step, if the thermal power is detected and the thermal power is changed and the thermal power is changed, the thermal power is increased by 1/2 with respect to the thermal power change, and if the thermal power is not changed, the current thermal power is maintained. The heating supply water is characterized in that it comprises a seventh step of detecting the change in thermal power and if the thermal power is changed, if the thermal power is changed by reducing the thermal power by 1/2 the thermal power change, and if the thermal power is not changed, the thermal power is reduced by the thermal power change. Hot water temperature control method using temperature.