KR100614584B1 - Method for controlling temperature of boiler's domestic hot water - Google Patents

Abstract

The present invention relates to a method for controlling the hot water temperature of a boiler, and more particularly, to have a different limit temperature according to the set hot water temperature to prevent the on / off of the boiler frequently generated when using hot water by setting a low temperature, by setting a high temperature The present invention relates to a hot water temperature control technology of a boiler that prevents burns due to high temperature limit of hot water when hot water is used.

Hot water temperature control method of the boiler according to the present invention comprises the steps of calculating the limit temperature of different ratios according to the input hot water set temperature; And measuring the temperature of the hot water supplied by the boiler to control the on / off of the heat generating means of the boiler so that the temperature of the hot water reaches the limit temperature.

Accordingly, by calculating a different ratio of the limit temperature according to the set temperature of the hot water input by the user, by comparing the calculated limit temperature and the actually measured hot water temperature and controlling the heat generating means of the boiler accordingly, The provision of hot water, of course, has the advantage of preventing frequent on / off of the boiler and minimizing the variation of the hot water temperature which is tapping.

Boiler, three-way toilet, hot water set temperature, hot water limit temperature

Description

Method for controlling temperature of boiler's domestic hot water}

1 is a block diagram schematically showing a conventional boiler configuration.

2 is a flowchart schematically illustrating a method for controlling hot water temperature of a boiler according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10. Water tank 20. Means of heat generation

30. Pump 40. Water flow switch

50. Direct piping 60. Heat exchanger

70. Heating piping 80. Three-way

90. Hot water piping 100. Control panel

110. Controller

The present invention relates to a method for controlling a hot water temperature of a boiler, and more particularly, to have a different limit temperature according to the set hot water temperature to prevent frequent on / off of the boiler according to the use of hot water, and a deviation of the hot water temperature which is tapping. The hot water temperature control technology of the boiler can be minimized.

In general, boilers provide the heating of houses and buildings, as well as hot water used by residents. The boiler heats and supplies the direct water supplied to the boiler to the set temperature according to the temperature of the hot water set by the user.

On the other hand, the hot water control system provided in the heating device, such as hot water heaters, boilers measure the temperature of the hot water is periodically supplied to provide hot water of the temperature set by the user, accordingly on / off or proportional control of the heat generating unit of the boiler Adjust the temperature of the hot water up to the set temperature. In general, the hot water temperature control method of the hot water control system may be proportionally controlled or turned off according to the limit temperature calculated based on the set temperature.

If there is a hot water limit temperature, the limit temperature is about 110% ~ 120% higher than or equal to the set hot water temperature. The hot water control system stops the combustion of the boiler when the limit temperature is reached, and after stopping, it burns the boiler again to maintain the temperature of the hot water when the temperature reaches about 80% to 90% lower than the set hot water temperature. To control. This is to reduce the temperature variation caused by frequent on / off of hot water heated and supplied by the boiler, as well as to reduce the time of hot tapping.

For example, suppose that the hot water limit temperature is limited to 120% of the set temperature and the restart temperature is controlled to 80% of the set temperature. At this time, if the temperature of the hot water set by the user is 50 ° C, and the amount of hot water supplied is small and proportional control is performed with minimum combustion, the hot water temperature control system of the boiler heats the hot water supplied until it reaches 60 ° C. When the temperature of the hot water reaches the hot water limit temperature 60 ° C, the hot water temperature control system stops the combustion of the boiler.

In addition, if the temperature of the hot water falls to 80% of the set temperature, that is, 40 ° C. or lower, that is, restart temperature due to continuous use of hot water while the combustion is stopped, the temperature control system drives the heat generating means of the boiler to control the temperature of the hot water. Heat to the limit temperature of 60 ° C.

However, in the method of controlling the temperature of hot water, the higher the temperature set by the user has, the higher the limit temperature is higher than the set temperature so that hot water of a temperature higher than the desired temperature is supplied. For example, when the temperature of the hot water input by the user is 80 ° C, the temperature of the hot water supplied by the actual boiler is 96 ° C. Therefore, a problem such as a burn of hot water supplied to a temperature higher than that of a user's desired temperature may be caused, and a lot of energy is wasted because more boiler heat is generated to maintain the temperature of the hot water. There is a disadvantage.

Further, for example, when the user sets the hot water temperature at 40 ° C, the limit temperature calculated by the conventional method is 48 ° C. Therefore, when the temperature is low, the difference between the set hot water temperature and the limit temperature of the hot water temperature control system of the boiler is small, there is a problem that frequent on / off of the boiler to maintain the limit temperature.

The present invention was devised to solve this problem, and its purpose is to calculate the limit temperature of different ratios according to the set temperature of hot water input by the user and apply it to the boiler, thereby providing appropriate hot water to the user as well. The present invention provides a method of controlling hot water temperature of a boiler that can prevent frequent on / off of the boiler.

As described above, the method for controlling hot water temperature of a boiler according to an exemplary embodiment of the present invention calculates different ratios of limit temperatures according to high / low set temperature of hot water input by a user, The temperature of the hot water actually measured is compared and the on / off of the boiler is controlled according to the result.

According to a characteristic aspect of the present invention, the ratio of the limit temperature calculated according to the method of controlling the hot water temperature of the boiler according to the present invention decreases the ratio of the limit temperature calculated when the input set temperature is higher, and the lower the set temperature. The ratio of the calculated limit temperature is high.

Accordingly, the limit temperature calculated according to the temperature control method according to the present invention is characterized by being calculated by adding a value obtained by dividing a constant calculated according to the capacity of the corresponding boiler by the set temperature to an input set temperature.

According to this aspect of the present invention, the hot water temperature control method of the boiler according to the present invention has an advantage of preventing frequent on / off of the boiler as well as providing hot water at an appropriate temperature.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention. In addition, the present invention is not limited to the boiler only, it is known in advance that it can be applied to both hot water temperature control of the heating device, such as a hot water heater, a boiler.

FIG. 1 is a block diagram schematically showing a conventional boiler configuration, and FIG. 2 is a flowchart schematically illustrating a method for controlling hot water temperature of a boiler according to an exemplary embodiment of the present invention. As shown, the boiler includes a water tank 10 for storing water used as heating water, heat generating means 20 for heating water supplied from the water tank 10, and a water tank 10. From the pump 30 for supplying water to the heat generating means 20, circulating the heating water heated by the heat generating means 20, and the direct water pipe 50 for supplying the direct water by the water flow switch 40. The heat exchanger 60 which performs heat exchange between the supplied direct water and the heating water, the three-sided valve 80 which selectively supplies the heating water to the heat exchanger 60 or the heating pipe 70, and the heat exchanger 60 A hot water pipe 90 through which the hot water is discharged, an operation unit 100 for receiving a user's operation command, and a controller 110 for controlling the overall apparatus of the boiler according to the operation command input from the operation unit 100. It is composed.

Referring to the hot water supply process according to the general use of hot water, first, the boiler is connected to the three-sided valve 80 to the hot water pipe 90 side by the control of the controller 110 with the water flow switch 400 is turned on to supply hot water Explain that you are doing. The water supplied from the water tank 10 is supplied to the heat generating means 20 by the pump 30 and the heating water (heating water), which is the water heated by the heat generating means 20, is passed through the three-way valve 80. Flow into heat exchanger 60. In the heat exchanger 60, as already known, heat is exchanged with the water heated in the heat generating means 20 and the direct water supplied from the direct pipe 50. The direct water supplied from the direct pipe 50 is elevated in temperature by the heat exchanger 60 and is supplied through the hot water pipe 90.

The temperature of the hot water provided by the boiler depends on the set temperature set by the user. When the user sets and inputs the temperature of the hot water, the controller 110 calculates a limit temperature according to the input set temperature. The limit temperature refers to a limit temperature of the hot water heat exchanged by the heating water heated from the heat generating means 20 of the boiler. The temperature at which the hot water heated and supplied by the boiler moves along the hot water pipe 90 is taken out to the outside. In addition to reducing the temperature of the hot water is usually calculated to be higher than the set temperature in order to reduce the re- tapping time.

The controller 110 controls the temperature of the heating water by controlling the on or off of the heat generating means 20 according to the calculated limit temperature, and supplies the adjusted heating water to the heat exchanger 60 to meet the set temperature. Provide hot water.

However, in the related art, the heat generating means 20 is controlled by calculating the limit temperature at a constant ratio regardless of the high / low of the set temperature. In the conventional method for calculating the limit temperature, the higher the set temperature, the higher the limit temperature is calculated to provide hot water of too high a temperature compared to the temperature of the hot water set by the user. In addition, when the set temperature is a low temperature, there is a problem that the boiler frequently turns on / off to maintain the limit temperature because the difference between the set hot water temperature and the limit temperature of the hot water temperature control system of the boiler is small.

According to a characteristic aspect of the present invention, the controller 110 according to the present invention calculates different ratios of limiting temperatures according to hot water set temperatures input through the operation unit 100, and generates heat according to the calculated limiting temperatures ( 20) control on / off.

In the method of calculating the limit temperature of the controller 110, the higher the set temperature input through the control unit 100, the smaller the difference between the limit temperature and the set temperature, and the lower the set temperature, the greater the difference between the limit temperature and the set temperature. It is done. To implement this, the controller 110 calculates by adding a value obtained by dividing the constant calculated by the capacity of the boiler to the set temperature inputted by the set temperature. This may be expressed as Equation 1 below.

Where x is the set temperature of the hot water set by the user, t is a constant calculated according to the capacity of the boiler, y represents a limit temperature calculated by the controller 110 according to the present invention.

The limit temperature according to Equation 1 is x, that is, the higher the set temperature, the smaller the difference between the calculated limit temperature and the set temperature, and the lower the set temperature, the greater the difference between the calculated limit temperature and the set temperature. For example, if the set temperature set by the user is 80 ° C and the constant according to the capacity of the boiler is 640, the limit temperature calculated by the controller 110 is 88 ° C. This is a temperature 8 ° C higher than the set temperature 80 ° C.

When the set temperature set by the user is 40 ° C, the limit temperature calculated by the controller 110 is 52 ° C. The calculated limit temperature 52 ° C is 12 ° C higher than the set temperature. Therefore, according to the limit temperature calculated by this method, the higher the set temperature set by the user, the smaller the difference with the limit temperature. Hazardous on / off of the heat generating means 20 can be prevented.

Hereinafter, the hot water temperature control method according to the present invention will be described with reference to FIG. 2. When the set temperature of the hot water is input from the user through the operation unit 100 (S101), the controller 110 calculates a limit temperature according to the input set temperature (S103). The limit temperature calculated by the controller 110 is calculated by the method according to Equation 1 as described above. The limit temperature calculated by the controller 110 is calculated such that the difference between the calculated limit temperature and the set temperature decreases as the set temperature increases, and the difference between the calculated limit temperature and the set temperature increases as the set temperature decreases.

When the user attempts to use hot water by opening a hot water valve (not shown) connected to the hot water pipe 90 (S105), the water flow switch 40 is opened by the flow of water, and the controller 110 detects the three-way ( 80 is controlled so that the heating water heated by the heat generating means 20 is supplied to the heat exchanger 60. If the use of hot water is not detected, the controller 110 controls the three-sided valve 80 to supply the heating water to the heating pipe 70 (S107).

The controller 110 measures the temperature of the hot water currently supplied by heat exchange in the heat exchanger 60. Temperature measurement of the hot water is measured through a temperature sensor provided in the heat exchanger 60 or hot water pipe (90). The temperature sensor transmits the measured hot water temperature to the controller 110.

The controller 110 compares the received temperature of the actually supplied hot water with the limit temperature (S109), and generates more heat by applying a control signal to the heat generating means 20 when the temperature of the corresponding hot water is lower than the limit temperature. Increase the temperature of the heating water. The heating water whose temperature is increased is supplied to the heat exchanger 60, and heat-exchanged with the direct water supplied by the direct water pipe 50 so that the temperature of the hot water reaches the limit temperature (S111). When the temperature of the hot water sensed by the temperature sensor reaches the limit temperature, the controller 110 controls the extinguishing stroke of the heat generating means 20 to be performed (S113).

On the other hand, if the temperature of the hot water drops to a predetermined ratio, for example, 80% or less of the set temperature by the continuous use of the hot water in the state that the combustion of the heat generating means 20 is stopped, the controller 110 heats the boiler. The generator 20 is driven to heat the temperature of the hot water to the limit temperature. The controller 110 repeats the above-described process until the user's use of hot water is finished, and again controls the three-sided valve 80 until the use of hot water is detected so that the heating water is supplied to the heating pipe 70 (S115). )

As described above, the hot water temperature control method of the boiler according to the present invention calculates the limit temperature of different ratios according to the set temperature of the hot water input by the user, and compares the calculated limit temperature with the actually measured hot water temperature Accordingly, by controlling the heat generating means of the boiler, there is an advantage that can prevent the frequent on / off of the boiler as well as providing adequate hot water to the user.

On the other hand, the present invention has been described with reference to the embodiments shown in the drawings but this is only exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (3)

In the hot water temperature control method of the boiler, Calculating a limit temperature of different ratios according to the input hot water set temperature; Measuring the temperature of hot water supplied by the boiler to control on / off of the heat generating means of the boiler such that the temperature of the hot water reaches the limit temperature; Hot water temperature control method of the boiler comprising a. The method of claim 1 wherein the calculated temperature limit is: The higher the set temperature input, the smaller the ratio of the limit temperature, and the lower the set temperature, the higher the ratio of the limit temperature hot water temperature control method of the boiler, characterized in that. The method of claim 1, wherein the limit temperature calculation method comprises: Hot water temperature control method of the boiler, characterized in that the calculated by adding a value obtained by dividing the constant divided by the set temperature with a constant calculated according to the capacity of the boiler.

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