KR101977021B1 - Apparatus for supplying hot water and method for the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device and a hot water supply method, and a hot water supply device according to an embodiment of the present invention includes a heater for heating incoming water to a heat capacity of the heater; An outflow valve for regulating the amount of water coming out of the heater; A temperature sensor for measuring an outflow temperature of the water to be dispensed; And a controller for controlling an opening degree of the water outlet valve in accordance with a change in the water outlet temperature value and controlling an opening degree of the water outlet valve in proportion to a difference between the water outlet temperature and the target temperature, The amount of change in the outgoing water temperature value is calculated, and the degree of opening of the outflow valve can be adjusted according to the calculated temperature change amount.

Description

Technical Field [0001] The present invention relates to a hot water supply apparatus and a hot water supply method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device and a hot water supply method, and more particularly, to a hot water supply device and a hot water supply method that enable hot water intake in a short time.

The hot water supply device used in a water purifier can be classified into a water tank type in which a heater is installed in a water tank and a direct water type in which the water to be supplied is heated by a heater whenever necessary.

The water tank type hot water supply device can filter the room-temperature water supplied from the water supply with a filter suitable for drinking water, and then store the water in a predetermined water tank and supply the heated water to the user. In this case, the filtered purified water includes a constant water cooler for storing the purified water at a normal temperature, and a hot water tank for storing hot water heated to a constant temperature. The purified water is supplied to the hot water tank, And may be configured to be heated by hot water by a heater.

Since the water tank type hot water supply device needs to keep the temperature of the water in the water tank at a predetermined temperature regardless of whether hot water is used or not, standby power is consumed and a separate hot water tank is required. May be required. In addition, due to the nature of water having a large specific heat, there is a problem that the waiting time is required from several tens seconds to several minutes in order to provide a target temperature desired by the user.

Therefore, in recent years, there has been used a direct water type hot water supply device that instantaneously heats water to supply hot water in response to a user's request for hot water supply. However, the direct water type hot water supply device also includes a hot water supply device There is a problem in that it can not be provided.

The present invention is intended to provide a direct water type hot water supply device and a hot water supply method which enable hot water intake in a short time.

According to an aspect of the present invention, there is provided a hot water supply device including: a heater for heating incoming water to a heat capacity; An outflow valve for regulating the amount of water coming out of the heater; A temperature sensor for measuring an outflow temperature of the water to be dispensed; And a controller for controlling the opening degree of the water outlet valve in proportion to the difference between the outgoing water temperature and the target temperature.

Here, the control unit may calculate a change amount of the outflow temperature value, and adjust the opening degree of the outflow valve in accordance with the calculated change amount.

The controller may further include a voltage sensing unit for sensing a supply voltage supplied from the power supply, wherein the controller calculates the heat capacity using the supply voltage, and the heater calculates the heat capacity and the outflow temperature The opening degree of the water outlet valve can be set using the difference in the target temperature.

Here, the voltage sensing unit may receive the hot water extraction signal requesting hot water extraction, or may sense the supply voltage when a predetermined time interval elapses.

Here, the voltage sensing unit may convert the supply voltage input through the AC into a DC voltage, and quantize the DC voltage to sense the magnitude of the supply voltage.

Here, the controller may set a proportional constant corresponding to the heat capacity of the heater, and set an opening degree of the water outlet valve in proportion to a difference between the outgoing temperature and the target temperature.

Wherein the control unit sets the opening degree of the outflow valve at the time of calculating the amount of change to a first setting value when the difference between the outgoing temperature and the target temperature is equal to or greater than a predetermined value and the calculated amount of change is equal to or greater than the first reference amount of change, It can be maintained for a period of time.

Wherein the control unit sets the degree of opening of the water outlet valve at the time of calculating the amount of change to a second setting value when the difference between the outgoing water temperature and the target temperature is less than a predetermined value and the calculated change amount is equal to or greater than a second reference change amount It can be maintained for a period of time.

In the hot water supply device according to the embodiment of the present invention, when the hot water supply signal is input, the initial opening degree of the water outlet valve for regulating the water flow rate of the water coming out from the heater is set and the water outlet valve is opened An initial heading phase; And an outflow control step of controlling the opening degree of the outflow valve in proportion to a difference between the outflow temperature and the target temperature by controlling the degree of opening of the outflow valve and regulating the outflow temperature of water out of the heater to the target temperature .

The initial watering step may further include a step of calculating a heat capacity of the heater that measures a supply voltage supplied from a power source and calculates a heat capacity of the heater using the supply voltage.

Here, the heat capacity calculation process of the heater may include inputting a hot water extraction signal requesting hot water extraction, or measuring the supply voltage when a predetermined time interval elapses, so that the heater can calculate the heat capacity.

Here, the heat capacity calculation process of the heater may convert the supply voltage of the AC supplied from the power supply into a DC voltage, and quantize the DC voltage to measure the magnitude of the supply voltage.

Wherein the outflow control step calculates a change amount of the outflow temperature value and adjusts the opening degree of the outflow valve in accordance with the calculated change amount.

Wherein the outflow control step sets the degree of opening of the outflow valve at the time of calculating the amount of change to be equal to or larger than the first reference change amount when the outgoing temperature and the target temperature differ from each other by a predetermined value or more, 1 can be maintained for a set time.

Wherein the outflow control step controls the opening degree of the outflow valve at the time of calculating the change amount when the outflow temperature and the target temperature differ by less than the predetermined value and the calculated amount of change is equal to or greater than the second reference amount of change And can be maintained for a second set time.

According to the hot water supply device and the hot water supply method according to an embodiment of the present invention, hot water having a target temperature desired by the user can be quickly provided.

In addition, the control operation for extracting the target temperature can be minimized to reduce the energy required for extracting the hot water.

Further, since the heater according to the voltage variation of the commercial AC power source generates the hot water in consideration of the change of the heat capacity, the hot water having the correct target temperature can be extracted.

Further, since the heater measures the heat capacity by directly measuring the voltage applied to the heater, hot water having a target temperature desired by the user can be provided even in the foreign countries where the voltage of the commercial AC power source is different.

1 is a block diagram showing a hot water supply apparatus according to an embodiment of the present invention.
2 is a flowchart showing a hot water supply method according to an embodiment of the present invention.
FIG. 3 is a flowchart showing an initial watering step of a hot water supplying method according to an embodiment of the present invention.
FIG. 4 and FIG. 5 are graphs showing the water outflow temperature of the water coming out from the hot water supply apparatus according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

1 is a block diagram showing a hot water supply apparatus according to an embodiment of the present invention.

1, a hot water supply apparatus according to an embodiment of the present invention may include a heater 10, a water outlet valve 20, a temperature sensor 31, a water temperature sensor 32, and a controller 40 have.

Hereinafter, a hot water supply device according to an embodiment of the present invention will be described with reference to FIG.

The heater (10) can heat the incoming water to a heat capacity of the heater. The heat capacity of the heater is related to the power consumption of the heater 10 and can be expressed in watts (W). The heater (10) can constantly heat the predetermined heater with respect to the inflow water at a heat capacity.

The amount of heat transferred from the heater 10 to the inflow water may be proportional to the heat capacity of the heater 10 and the time when the heater 10 is heated by the heater 10. Therefore, if the heater of the heater 10 maintains a constant heat capacity, the amount of heat transferred from the heater 10 by the introduced water may be proportional to the time of heating by the heater 10. Since the time during which the inflow water is heated by the heater 10 can be determined according to the time taken for the inflow water to escape from the heater 10 through the outflow valve 20, The heating time can be adjusted according to the degree of opening of the valve 20. [

The heater 40 may be turned on or off by the controller 40. The controller 40 may turn on the heater 10 when the hot water extraction signal is input, So that the heater can heat the water having the heat capacity.

However, if the voltage or current supplied to the heater 10 is not constant, the heat capacity of the heater may not be maintained constant. The heat capacity of the heater can be calculated using at least two of the heater voltage V, the heater current I and the heater resistance R (P = V * I = V ^ 2 / R = I ^ 2 * R ), The commercial AC power supply for supplying power to the heater 10 may actually have a voltage variation of about 15%. Therefore, the voltage to be distributed to the heater 10 may be varied according to the voltage variation of the commercial AC power source, which may lead to variation of the heat capacity of the heater.

Generally, since the voltage fluctuation of the commercial AC power supply is regarded as an allowable tolerance range, the heater may not consider the difference in the heat capacity. However, the heating time is short like the direct water heater, In the case where hot water is to be supplied, it is also necessary to consider an error due to the voltage fluctuation of the commercial AC power supply. Therefore, it is possible to further include a configuration of a voltage sensing unit for sensing a magnitude of a supply voltage supplied from the commercial AC power source, that is, a power source, and the heater, depending on the magnitude of the supply voltage measured by the voltage sensing unit, The heating time for the water introduced into the heater 10 can be set.

Specifically, the voltage sensing unit performs half-wave rectification, smoothing, and voltage drop with respect to the AC voltage supplied from the power source, converts the DC voltage into a DC voltage, quantizes the analog value of the DC voltage with an analog- The supply voltage value can be obtained by a measurement method. For example, when the commercial AC power source of 220 V is used, the supply voltage supplied by the power source may be varied from 198 to 253 V due to the voltage fluctuation. The voltage sensing unit divides the supply voltage by 10 V intervals and supplies 200 V, 210 V, , 240V. 250V. ≪ / RTI > Therefore, the controller 40 can calculate the heat capacity of the heater based on each measured supply voltage, and set the opening / closing degree of the water outlet valve 20.

However, the voltage sensing unit may sense the supply voltage only when a hot water extraction signal is input at predetermined time intervals or in order to prevent power consumption consumed in the voltage sensing. In addition, Since the heater can calculate the heat capacity by knowing the magnitude of either the voltage or the current, a current sensing unit that senses the supply current supplied by the power supply instead of the voltage sensing unit may be utilized.

The water outlet valve (20) can adjust the amount of water exiting the heater (10). As described above, the time during which the water introduced into the heater 10 is heated by the heater 10 can be adjusted by adjusting the water-withdrawing amount of the water exiting the heater 10 using the water outlet valve 20 have. More specifically, as the opening of the water outlet valve 20 is shortened, the time for the inflow water to be heated by the heater 10 is shortened. As the water outlet valve 20 is blocked much more, 10 may be longer. Accordingly, the controller 40 controls the opening degree of the water outlet valve 20 to control the temperature of the water exiting the heater 10 to the target temperature.

The outflow valve 20 may adjust the opening degree by adjusting the size of the cross-sectional area of the opened flow path or the opening time of the outflow valve 20 according to the control signal of the controller 40.

Specifically, the water outlet valve 20 may include a flow path blocking means such as a disk to block part or all of the flow path through which water is extracted from the heater 10 by the flow path blocking means. Here, by controlling the size of the cross-sectional area of the flow path that the flow path blocking means blocks, the amount of water that flows out of the heater 10 per unit time can be adjusted.

The outflow valve 20 may be configured to periodically repeat opening and closing of the outflow valve 20 in a short period of time to adjust the amount of water discharged from the heater 10 per unit time, The opening and closing of the light source 20 can be realized by pulse width modulation (PWM). For example, the water outlet valve 20 receives a pulse-shaped control signal of a predetermined period transmitted from the controller 40, opens the water outlet valve 20 when the pulse is high, And when it is low, the water outlet valve 20 can be closed. The higher the number of pulses transmitted from the control unit 40 is, the more the amount of water per unit time can be extracted from the heater 10 by the water outlet valve 20.

Therefore, by using the water outlet valve 20, the water flow rate per unit time, that is, the water flow rate, of the water introduced into the heater 10 can be determined. As the watering speed is increased, the time taken for the water introduced into the heater 10 to be heated by the heater 10 is reduced, so that the temperature of the water coming out from the heater 10 can be lowered. On the other hand, if the watering speed is slow, the time taken for the water introduced into the heater 10 to stay inside the heater 10 is increased, so that the time for heating the introduced water by the heater 10 is increased , The temperature of the water extracted from the heater 10 becomes high.

Here, the opening degree of the water outlet valve 20 may be continuously adjusted from full opening to full opening, or the opening degree may be set according to a predetermined number of steps. For example, it is divided into four stages from full opening to complete shutoff. The first stage is completely shut off, the second stage is opened to 1/3, the third stage is opened to 2/3, and the fourth stage is fully opened. At this time, the water outlet valve 20 can set the opening degree to a predetermined number of steps by using a stepping motor.

Here, the water outlet valve 20 may have an initial opening degree set to control the outflow temperature at the time of initial watering to the target temperature. That is, the opening degree of the water outlet valve 20 can be set in advance in order to extract the water having the target temperature from when the water starts to be extracted from the heater 10, and the initial opening degree of the water outlet valve 20 May be set by the control unit (40).

The temperature sensor 31 is capable of measuring the outflow temperature of the outgoing water. The temperature sensor 31 may be any type of sensor capable of measuring the temperature of water. The temperature sensor 31 may be provided between the water outlet valve 20 and the heater 10 as shown in FIG. Therefore, when the water outlet valve 20 is completely shut off, the outgoing water temperature measured by the temperature sensor 31 may be the temperature of the water stored in the heater 10.

In addition, the hot water supply apparatus according to an embodiment of the present invention may further include an inlet water temperature sensor 32, which can measure an inflow temperature of water flowing into the heater 10 have. The measured inlet temperature may then be used to set the initial opening degree of the outlet valve 20.

The control unit 40 can operate the heater 10 when the hot water extraction signal is input and can set the initial opening degree of the water outlet valve 20 so as to allow the water having the target temperature to flow from the time of the superheated time .

As described above, at the time of initial watering, the outgoing temperature measured by the temperature sensor 31 may be the same as the temperature of the water stored in the heater 10. Therefore, it is possible to experimentally determine the degree of opening of the water outlet valve 20 most suitable for varying the initial opening degree of the water outlet valve 20 according to the water outlet temperature at the time of initial watering. That is, the predetermined opening degree can be set to an initial opening degree of the water outlet valve 20 according to the measured water outlet temperature, thereby allowing the water outlet to approach the target temperature from the time of the initial discharge.

Here, the controller 40 may measure the waiting time from the last time of departure to the next time of departure, and may set the initial degree of opening of the water outlet valve 20 in accordance with the waiting time and the outflow temperature. That is, the initial opening degree can be set in consideration of not only the outgoing water temperature but also the waiting time for use.

The control unit 40 may receive the inflow temperature of the water received by the heater 10 from the inflow temperature sensor 32. The control unit 40 may use the input inflow temperature, It is possible to calculate the amount of water coming out from the heater. Therefore, the initial opening degree of the water outlet valve 20 can be set according to the calculated water flow rate.

을 이용하여 상기 히터(10)에서 출수되는 물의 초기 출수량을 계산할 수 있으며 상기 계산된 출수량에 따라 상기 출수밸브(20)의 초기 개방정도를 설정할 수 있다. 즉, 상기 입수온도센서(32)로부터 상기 유입온도를 입력받아, 보다 정확하게 상기 출수밸브(20)의 초기개방정도를 설정할 수 있다. 여기서, V는 출수되는 물의 부피, w는 히터(10)의 히터가열용량, c는 물의 비열, ρ는 물의 밀도, Δt는 가열시간, T₁은 목표온도, T₂는 유입온도이다.
For example,

The initial water level of the water coming out of the heater 10 can be calculated using the calculated water level and the initial degree of opening of the water level valve 20 can be set according to the calculated water level. That is, it is possible to set the initial opening degree of the water outlet valve 20 more accurately by receiving the inlet temperature from the water inlet temperature sensor 32. Here, V is the volume of water that is heading, w is the heater of the heater 10, heat capacity, c is the specific heat of water, ρ is density of water, Δt is the heating time, T ₁ is the target temperature, T ₂ is the inlet temperature.

After the initial watering, the opening degree of the water outlet valve (20) can be controlled in accordance with the change of the outgoing water temperature value.

As described above, the temperature of the water flowing into the heater 10 may increase in proportion to the heat capacity and the time when the heater 10 is heated by the heater 10.

Since the heat capacity of the heater is generally kept constant, the controller 40 controls the opening time of the water outlet valve 20 to control the time during which the water is heated by the heater 10 . Accordingly, the controller 40 controls the opening degree of the water outlet valve 20 according to the water outlet temperature measured by the temperature sensor 31 to control the temperature of the water exiting the heater 10 to the target temperature .

Specifically, the control unit 40 may calculate the difference between the outgoing water temperature and the target temperature, and control the opening degree of the outflow valve 20 to be proportional to the difference. That is, if the outgoing water temperature is higher than the target temperature, the water outlet valve 20 is opened by an amount proportional to the difference between the outgoing water temperature and the target temperature. If the outflow temperature is lower than the target temperature, The water outlet valve can be shut off by an amount proportional to the difference in the outgoing water temperature. Here, the degree of opening of the outflow valve 20 can be adjusted by using a proportional formula generated according to the difference between the outgoing temperature and the target temperature, or by using an experimentally prepared table according to the outflow temperature.

However, as described above, the heat capacity of the heater of the heater 10 can be varied by the voltage fluctuation of the commercial AC power source. Therefore, in order to control the temperature more accurately, it is preferable to set the initial opening degree of the water outlet valve 20 considering the change of the heat capacity due to the voltage fluctuation of the commercial AC power source.

For this, the heater 10 may further include a voltage sensing unit configured to sense a supply voltage supplied from the power source, and the controller 40 may obtain the heat capacity of the heater from the supply voltage. Specifically, it is also possible to calculate the heater voltage actually applied to the heater 10 from the supply voltage, and calculate the heat capacity of the heater 10 using the heater voltage. That is, the control unit 40 calculates the heat capacity of the actual heater by substituting the resistance value of the heater 10 and the inverter voltage into P = V * I = V ^ 2 / R.

First, the controller 40 can use the heat capacity calculated by the actual heater to set the initial opening degree of the water outlet valve 20 corresponding to the water outlet temperature. That is, even if the outflow temperature is the same, the initial opening degree can be different if the measured heaters have different heat capacities, and the outflow temperature at the initial outflow and the measured outflow temperature of the outflow valve 10 ) Can be obtained experimentally. Therefore, the measured opening temperature and the opening degree set by the heater according to the heat capacity can be set as the initial opening degree of the water outlet valve 20, thereby allowing the water to reach the target temperature close to the target temperature.

에서, 히터가열용량(w)에 상기 실제 계산한 히터가열용량을 대입하는 방식으로 상기 히터(10)에서 출수되는 물의 초기 출수량(V)을 계산할 수 있다. 이 경우 실제 상기 히터(10)에 인가되는 전압을 바탕으로 상기 히터가열용량을 계산하고 이에 따라 상기 출수밸브(20)의 초기개방정도를 조절하는 것이므로, 보다 정확한 온도조절이 가능하다. Further, when the inflow temperature of water obtained by the heater 10 is input,

(V) of the water leaving the heater (10) in such a manner that the heater calculates the heat capacity (w) by substituting the actually calculated heater with the heat capacity. In this case, since the heater calculates the heat capacity on the basis of the voltage actually applied to the heater 10 and accordingly controls the initial opening degree of the water outlet valve 20, more accurate temperature control is possible.

After the initial watering, the controller 40 can utilize the heat capacity actually calculated by the controller even when adjusting the opening degree of the water outlet valve 20 according to the change of the outgoing water temperature value. Specifically, the heater may set a proportional constant proportional to the heat capacity, and the opening degree of the water outlet valve (40) may be set in proportion to the difference between the outgoing water temperature and the target temperature. The degree of opening of the water outlet valve 20 can be adjusted by using a proportional formula generated by the heater in accordance with the heat capacity and the difference between the outgoing water temperature and the target temperature or by using a table table created experimentally according to the heat capacity and the outflow temperature .

For example, the supply voltage measured by the voltage sensing unit may be quantized to 200V, 210V, 220V, 230V, 240V, and 250V, and there may be a preset proportional constant according to each supply voltage value. Therefore, the opening degree of the water outlet valve 20 can be adjusted by using the proportional constant and the water outlet temperature. Here, the proportional constant can be obtained experimentally.

Here, the controller 40 calculates the heat capacity of the heater directly based on the supply voltage measured by the voltage sensing unit, so that it is possible to control according to the voltage variation of the commercial AC power supply. Therefore, it is possible to provide the hot water having the target temperature desired by the user without any setting process even in the foreign countries where the voltage range of the commercial AC power source is different. That is, it is possible to provide consistency to foreign countries in which the voltage range of the commercial AC power source is different.

However, even if the initial opening degree of the outflow valve 20 is set in accordance with the outflow temperature, the heated water supply device may not be sufficiently heated, and if the target temperature is not reached Water can be provided. However, since the user always hopes that the hot water supply device will provide the water of the target water temperature, it is necessary for the hot water supply device to provide the water having the target water temperature even at the initial watering time.

Therefore, the controller 40 can operate the heater 10 during the preheating time before the water outlet valve 20 is opened, when the temperature of the water stored in the heater 10 is below the preheating reference temperature.

That is, before the water stored in the heater 10 is heated, the water stored in the heater 10 is heated to warm the temperature of the heater 10 before the water starts to be heated. In this case, the response time may be delayed from the time when the user inputs the hot water extraction request to the hot water extraction signal to the time required for the preheating, but the user can provide the desired water temperature from the initial watering.

Here, there may be a case where the hot water supply device supplies hot water to the user and then supplies hot water again soon. In this case, since the temperature of the water already existing in the heater 10 is close to the target temperature, the preheating may not be necessary. Conversely, there may be a case where the hot water supply device supplies hot water after a long time has elapsed since the hot water was supplied to the user, for example, two hours later. In this case, the temperature of the water present in the heater 10 may be already different from the target temperature.

Therefore, the controller 40 checks the temperature of the water stored in the heater 10 using the temperature sensor 31, and only when the temperature of the stored water is equal to or lower than the preheating reference temperature, . ≪ / RTI >

In addition, the control unit 40 may set the preheating time to be longer as the temperature of the water stored in the heater 10, that is, the outflow temperature is lower. Since the difference from the target temperature becomes larger as the outgoing water temperature is lower, the preheating time is set to be longer so that the water stored in the heater 10 can be sufficiently preheated. On the contrary, if the outflow temperature is high, it is already close to the target temperature, so that even if heating is performed for a short time, the temperature can be sufficiently reached.

Further, the control unit 40 measures the waiting time from the time of the last watering out to the next watering out of the hot water supply device, and controls the preheating time and the water outflow valve 20 Can be set.

When the input of the hot water extraction signal is interrupted, the hot water supply device may shut off the water outlet valve 20 in order to stop hot water supply. In this case, the temperature of the water stored in the heater 10 is lower than the target temperature And may be heated to a temperature. However, if the hot water supply device is no longer operated, the temperature of the water stored in the heater 10 gradually increases with time. Therefore, the opening degree of the water outlet valve 20 can be set in consideration of the use waiting time as well as the temperature difference between the target temperature and the water outflow temperature.

In addition, the controller 40 may adjust the degree of opening of the water outlet valve 20 according to the amount of change in the outgoing water temperature value so as to quickly extract the water having the target temperature. The operation of the controller 40 will now be described with reference to FIGS. 4 and 5. FIG.

4 (a) is a graph showing the outflow temperature at the time of first outbound, and shows a graph in the case of outgoing hot water after a predetermined time has passed since the last outbound. Referring to FIG. 4 (a), it can be seen that the outgoing water temperature converges to the target temperature, which can be obtained by controlling the degree of opening of the outflow valve 20, as previously discussed.

However, as shown in FIG. 4 (a), the outgoing water temperature can vibrate up and down on the basis of the target temperature in the process of converging to the target temperature, and by the vibration of the outflow temperature, Or cold water can be supplied. In addition, it may take a long time to stabilize to a desired target temperature. Therefore, it is necessary to control the outflow valve 20 to minimize the vibration of the outflow temperature graph.

Fig. 4 (b) is a graph showing the outflow temperature at the time of consecutive outgoing to continuously extract hot water. Since the hot water is being extracted continuously, the outflow temperature does not rise sharply at the initial stage as shown in FIG. 4 (b), but vibration appears on the outflow temperature graph. Therefore, it is necessary to control the water outlet valve 20 in order to minimize the vibration.

Therefore, the control unit 40 can calculate the change amount of the outflow temperature value, and adjust the opening degree of the outflow valve 20 according to the calculated change amount, thereby reducing the vibration to a minimum.

First, the control unit 40 calculates the difference between the outgoing water temperature and the target temperature, and compares the difference to determine whether the hot water extraction is the first outgoing water or the continuous outflow water.

And if the difference between the outgoing water temperature and the target temperature is equal to or greater than a predetermined value, it can be determined as the first outflow, and if the difference between the outflow temperature and the target temperature is less than the predetermined value,

Here, a difference between the outgoing water temperature and the target temperature can be obtained at an initial point of time when the hot water extraction is started, and in this case, the initial water outflow and the continuous outflow water can be clearly distinguished.

That is, in the case of the initial water outflow, the temperature of the water stored in the heater 10 may be near room temperature (26 degrees), but in the case of the continuous water outflow, It can be close to the temperature (85 degrees).

Therefore, the initial outflow and the continuous outflow can be distinguished through the difference between the outgoing temperature and the target temperature, and the control over the outflow valve 20 can be different according to the initial outflow and continuous outflow.

If it is determined as the first outflow, the change amount of the outflow temperature can be calculated, and the opening degree of the outflow valve 20 can be adjusted according to the change amount of the outflow temperature.

The change amount of the outgoing water temperature can be obtained by measuring the outgoing water temperature value at predetermined time intervals and then calculating the difference between the measured outgoing water temperature values. Here, if the calculated change amount of the outgoing water temperature is equal to or greater than the first reference change amount, the outgoing water temperature can be seen to rise sharply, and in the case of the sudden increase, the number of times of vibration and the vibration width of the outflow temperature graph can be increased.

Accordingly, if it is determined that the sudden rise occurs, the opening degree of the water outlet valve 20 can be fixed to the opening degree at the time of calculating the change amount, and the fixing can be maintained for the first set time. That is, in order to lower the change amount of the outgoing water temperature, it is possible to stop the opening degree control of the outflow valve 20 according to the outflow temperature for the first set time, Can be reduced as well.

Referring to FIG. 4 (a), even in the case of the initial outflow, the outflow temperature may gradually increase over time, and the difference between the outflow temperature and the target temperature may be less than the preset value. Therefore, in this case, the control can be performed in the same manner as in the case of the continuous outflow. Hereinafter, the operation of the control unit 40 at the time of continuous heading will be described.

If it is determined as the continuous outflow, the change amount of the outflow temperature can be calculated as described above, and it can be determined whether the change amount is equal to or greater than the second reference change amount. The second reference change amount is a value smaller than the first reference change amount, and if the second reference change amount is greater than or equal to the second reference change amount,

It is expected that the vibration width and the vibration frequency of the outflow temperature graph will be larger than the target vibration width and the vibration frequency if the outgoing water temperature is completely raised. It can be fixed to an opening degree. Here, the fixed time may be a second set time, which may be shorter than the first set time, and the change in the outgoing temperature may be reduced by stopping the control of the outflow valve 20. [

Accordingly, by adjusting the opening degree of the water outlet valve 20 according to the variation of the water outlet temperature, the water outlet temperature can be quickly converged to the target temperature, and the control of the water outlet valve 20 can be shortened, The energy consumption of the battery 20 can be saved.

Although not shown, there may be a water purifier including the hot water supply device. The water purifier may include a water filter for filtering tap water supplied from a water supply, and water purified by the water filter may be introduced into the heater. Thereafter, the constant is heated by the heater 10, and then can be taken out through the extraction valve 20 and provided to the user. Here, the controller 40 controls the opening degree of the extraction valve 20 to adjust the temperature of the extracted water to the target temperature. The controller 40 may control the degree of opening of the extraction valve 20 by using the temperature sensor 31 and the input temperature sensor 32 and may control the temperature of the heater 10 and the extraction valve 20 So that the water introduced into the heater 10 can be preheated.

FIG. 2 is a flowchart showing a hot water supply method according to an embodiment of the present invention, and FIG. 3 is a flowchart showing an initial water supply step of a hot water supply method according to an embodiment of the present invention.

2 and 3, the method for supplying hot water according to an embodiment of the present invention may include an initial watering step (S10) and an outflow control step (S20), wherein the initial watering step (S10) A setting process S11, a preheating process S12, and an initial opening process S13.

Hereinafter, a hot water supply method according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3. FIG.

In the initial watering step (S10), when the hot water supply signal is input, the initial opening degree of the water outlet valve for regulating the water flow rate of the water coming out from the heater can be set, and the water outlet valve can be opened by the set opening degree. In the initial watering step S10, the heater starts to flow water in accordance with an input hot water supply signal. In order to extract water having a target temperature from the time of the initial discharge, the initial opening degree of the water outlet valve is set .

Specifically, the initial watering step S10 may include an initial opening setting step S11, a preheating step S12, and an initial opening step S13.

The initial opening setting process S11 may set the predetermined opening degree to the initial opening degree of the outflow valve in accordance with the outflow temperature.

The outflow temperature is measured using a temperature sensor positioned between the heater and the outlet valve, and may indicate the temperature of the water stored in the heater before the outlet valve is opened. Therefore, the temperature of the water stored in the heater can be measured using the outflow temperature before the outflow valve is opened, and the initial opening degree of the outflow valve can be set according to the measured temperature of the water.

Specifically, since the temperature of the water stored in the heater may vary depending on how much time has elapsed since the last watering out, it is necessary to vary the initial opening degree according to the temperature of the water stored in the heater.

For example, if the temperature of the stored water is less than one minute from the time of last watering, it is not necessary to increase the temperature of the stored water by the heater, Can be set.

On the other hand, if more than two hours have elapsed since the time of last watering, the temperature of the stored water may be significantly different from the target temperature, so that it is necessary to heat a large amount by the heater. Therefore, the initial opening degree can be set so that a relatively small amount of water can be discharged.

The initial opening degree according to the outgoing water temperature can be determined experimentally by experimentally determining the most suitable initial opening degree by varying the initial opening degree of the outflow valve according to the measured outflow temperature, The initial opening degree of the outflow valve can be set in advance.

In addition, the temperature of the water stored in the heater before going out can be varied according to the time elapsed from the time of the last watering, that is, the waiting time from the last watering to the next watering, as mentioned above. Therefore, the initial opening setting step S11 may measure the waiting time for use from the time of the last watering to the time of the next watering out, and set the initial opening degree of the watering valve using the waiting time and the watering temperature .

The initial opening setting process S11 may further input an inflow temperature of water flowing into the heater in addition to the outflow temperature, and may set an initial opening degree of the outflow valve using the inflow temperature.

을 이용하여 상기 목표온도를 가지는 물을 출수하기 위해서 필요한 상기 히터의 초기 출수량을 계산할 수 있으며, 상기 계산된 출수량에 따라 상기 출수밸브의 초기 개방정도를 설정할 수 있다. 즉, 상기 유입온도를 입력받아 보다 정확하게 상기 출수밸브의 초기개방정도를 설정할 수 있다. 여기서, V는 출수되는 물의 부피, w는 히터(10)의 히터가열용량, c는 물의 비열, ρ는 물의 밀도, Δt는 가열시간, T₁은 목표온도, T₂는 유입온도이다.
Specifically,

It is possible to calculate the initial watering amount of the heater necessary for leaving the water having the target temperature and to set the initial opening degree of the watering valve in accordance with the calculated watering amount. That is, the initial opening degree of the outflow valve can be set more accurately by receiving the inflow temperature. Here, V is the volume of water that is heading, w is the heater of the heater 10, heat capacity, c is the specific heat of water, ρ is density of water, Δt is the heating time, T ₁ is the target temperature, T ₂ is the inlet temperature.

In this case, although the heater of the heater is assumed to have a constant heat capacity, the initial opening degree is set, but the heat capacity of the heater can be varied according to the voltage variation of the commercial AC power supply that supplies power to the heater . Therefore, in order to set a more accurate initial opening degree of the outflow valve, it is necessary for the heater to consider a change in the heat capacity.

For this, the initial heating step S10 may further include a heat capacity calculation process (not shown) of the heater, wherein the heat capacity calculation process of the heater measures a supply voltage supplied from the power supply, The heater can calculate the heat capacity.

Specifically, the heater heat capacity calculation process may detect the supply voltage by converting a supply voltage of the AC supplied from the power supply to a DC voltage and quantizing the converted DC voltage. That is, after half-wave rectification, smoothing, and voltage drop are performed on the AC voltage supplied from the power source to convert the DC voltage into a DC voltage, the DC voltage may be quantized by an AD converter to measure the supply voltage. Therefore, when a 220 V commercial AC power source which is varied from 198 V to 253 V is supplied, it is divided into 10 V intervals, and 200 V, 210 V, 220 V, 230 V and 240 V. 250V. ≪ / RTI > Since the resistance value of the heater is constant, the heater voltage value applied to the heater can be obtained when the supply voltage is measured, and the heat capacity of the heater can be easily calculated using P = V * I = V ^ 2 / R .

Then, in the initial opening setting step S11, the heater calculated in the heat capacity calculation process of the heater can set the opening degree of the water outlet valve using the heat capacity. Specifically, the initial opening setting step S11 may vary the opening degree of the water outlet valve when the calculated heater is different in heat capacity even if the water outlet temperature is the same, The opening degree of the outflow valve most suitable for the heat capacity of the heater can be obtained experimentally. Therefore, the measured outflow temperature and the predetermined opening degree according to the heat capacity of the heater can be set to the initial opening degree of the outflow valve.

에서, 히터가열용량(w)에 상기 실제 계산한 히터가열용량을 대입하는 방식으로 상기 히터에서 출수되는 물의 초기 출수량(V)을 계산할 수 있다. 이 경우 실제 상기 히터에 인가되는 전압을 바탕으로 상기 히터가열용량을 계산하고 이에 따라 상기 출수밸브의 초기개방정도를 조절하는 것이므로, 보다 정확한 온도조절이 가능하다.Further, in the case of receiving the inflow temperature of water obtained by the heater,

(V) of the water leaving the heater in such a manner that the heater calculates the heat capacity (w) by substituting the actually calculated heater with the heat capacity. In this case, the heater calculates the heat capacity on the basis of the voltage actually applied to the heater, and accordingly controls the initial opening degree of the water outlet valve, so that more accurate temperature control is possible.

In addition, the heat capacity calculation process of the heater may measure the voltage supplied from the power supply, that is, the supply voltage only when the hot water extraction signal is inputted every predetermined time interval. This is to save the power consumption required to measure the supply voltage.

The initial opening degree of the outlet valve for extracting the target temperature is set in the initial opening setting step S11. However, if the temperature of the water stored in the heater is excessively low, the heating of the extracted water may not be sufficient , Water that does not reach the target temperature can be provided.

Therefore, the initial watering step S10 further includes a preheating step (S12), and if the measured outflow temperature is lower than the preheating reference temperature, the heater can be operated to heat the water in the heater for the preheating time. If the temperature is lower than the preheating reference temperature due to the preheating process 12, the preheating may be performed before the outflow of water.

Specifically, if the measured outflow temperature is less than 60 degrees, the preheating process (S12) may be performed. If the measured outflow temperature is lower, the preheating time may be set to be longer and sufficiently preheated.

Here, the initial opening setting process S11 and the preheating process S12 may be performed simultaneously or the preheating process S12 may be performed first. The initial opening setting process S11 may be performed by the preheating process S12 The initial opening degree of the outflow valve can be set in consideration of the temperature of the preheated water.

The initial opening process 13 may open the water outlet valve in accordance with the opening degree of the set water outlet valve. Water having a target temperature can be provided by the initial opening setting process S11 and the preheating process S12 and then an outflow control step S20 is performed to continuously supply water having a target temperature even during outgoing .

The outflow control step (S20) can control the opening degree of the outflow valve to adjust the outflow temperature of the water coming out of the heater to the target temperature.

Here, the degree of opening of the water outlet valve can be adjusted according to the change of the outgoing water temperature value. Specifically, if the water outflow temperature is higher than the target temperature, the outflow valve is opened by an amount proportional to the difference between the outflow temperature and the target temperature And when the outflow temperature is lower than the target temperature, the outflow valve can be blocked by an amount proportional to the difference between the target temperature and the outflow temperature.

If the heater of the heater has a constant heat capacity, the temperature of the water exiting the heater may increase in proportion to the length of time of heating by the heater. As the water outlet valve is opened more, the amount of water to be dispensed per unit time increases, so that the length of time to be heated by the heater is shortened. On the other hand, when the water outlet valve is shut off a lot, the amount of water to be dispensed per unit time is reduced, so that the time for heating by the heater becomes long.

Accordingly, in the outflow control step (S20), the temperature of the water coming out from the heater can be adjusted by adjusting the opening degree of the water outlet valve, and the temperature of the water coming out from the heater can be adjusted to the target temperature.

Also, the outflow control step (S20) may receive the inflow temperature of the water flowing into the heater, and adjust the opening degree of the outflow valve using the inflow temperature, the heat capacity of the heater, and the target temperature.

Specifically, the inflow temperature, the heat capacity of the heater, and the target temperature may be used to calculate the amount of water required to dispense water having the target temperature, and the degree of opening of the water outlet valve may be adjusted according to the calculated amount of water have.

을 이용하여 상기 목표온도를 가지는 물을 출수하기 위해서 필요한 상기 히터의 출수량을 계산할 수 있으며, 상기 계산된 출수량에 따라 상기 출수밸브의 개방정도를 설정할 수 있다. 즉, 상기 유입온도를 입력받아 보다 정확하게 상기 출수밸브의 개방정도를 설정할 수 있다. 여기서, V는 출수되는 물의 부피, w는 히터(10)의 히터가열용량, c는 물의 비열, ρ는 물의 밀도, Δt는 가열시간, T₁은 목표온도, T₂는 유입온도이다.
For example,

It is possible to calculate the water flow rate of the heater necessary for taking out the water having the target temperature and to set the opening degree of the water outlet valve in accordance with the calculated water flow rate. That is, the opening degree of the outflow valve can be set more accurately by receiving the inflow temperature. Here, V is the volume of water that is heading, w is the heater of the heater 10, heat capacity, c is the specific heat of water, ρ is density of water, Δt is the heating time, T ₁ is the target temperature, T ₂ is the inlet temperature.

However, as described above, since the heat capacity of the heater may be variable, in order to control the temperature accurately, the actual heater of the heater, which is measured in the heat capacity calculation process, controls the opening degree of the water outlet valve using the heat capacity .

Specifically, it is possible to set a proportional constant that is proportional to the heat capacity of the heater, and to set the opening degree of the outflow valve in proportion to the difference between the outflow temperature and the target temperature. For this purpose, the heater can be set using a proportional equation generated according to the difference between the heat capacity, the difference between the outgoing temperature and the target temperature, or the experimentally prepared table according to the heater heating demand and the outflow temperature.

에서 히터가열용량(w)에 상기 실제 계산한 히터가열용량을 대입하는 방식으로 상기 히터의 출수량을 계산할 수 있다.
Further, when the temperature of the water which is supplied to the heater is input,

The heater can calculate the water flow rate of the heater in such a manner that the actually calculated heater substitutes the heat capacity for the heat capacity w.

The watering control step (S20) can adjust the opening degree of the water outlet valve by using a change amount of the outflow temperature value so as to quickly extract the water having the target temperature.

4 (a) is a graph showing the outflow temperature at the time of first outbound, and shows a graph in the case of outgoing hot water after a predetermined time has passed since the last outbound. Referring to FIG. 4 (a), it can be seen that the outgoing water temperature converges to the target temperature, which can be obtained by controlling the opening degree of the outflow valve, as described above.

However, as shown in FIG. 4 (a), the outgoing water temperature can vibrate up and down on the basis of the target temperature in the process of converging to the target temperature, and by the vibration of the outflow temperature, Or cold water can be supplied. In addition, it may take a long time to stabilize to a desired target temperature. Therefore, it is necessary to control the outflow valve to minimize the vibration of the outflow temperature graph.

Fig. 4 (b) is a graph showing the outflow temperature at the time of consecutive outgoing to continuously extract hot water. Since the hot water is being extracted continuously, the outflow temperature does not rise sharply at the initial stage as shown in FIG. 4 (b), but vibration appears on the outflow temperature graph. Therefore, it is necessary to control the outflow valve in order to minimize the vibration.

Therefore, the outflow control step (S20) can calculate the change amount of the outgoing water temperature value, and adjust the opening degree of the outflow valve according to the calculated change amount to reduce the vibration to a minimum.

First, in the watering control step (S20), the difference between the outgoing water temperature and the target temperature is calculated, and the difference is compared to determine whether the hot water extraction is the first outgoing water or the continuous outflow water.

And if the difference between the outgoing water temperature and the target temperature is equal to or greater than a predetermined value, it can be determined as the first outflow, and if the difference between the outflow temperature and the target temperature is less than the predetermined value,

Here, a difference between the outgoing water temperature and the target temperature can be obtained at an initial point of time when the hot water extraction is started, and in this case, the initial water outflow and the continuous outflow water can be clearly distinguished.

That is, in the case of the initial outflow, the temperature of the water stored in the heater may be near room temperature (26 degrees), but in the case of the continuous outflow, the temperature of the water stored in the heater is already 85, It can be close.

Therefore, the initial outflow and the continuous outflow can be distinguished through the difference between the outgoing temperature and the target temperature, and the control over the outflow valve can be different according to the initial outflow and the continuous outflow.

The controller can calculate the change amount of the outflow temperature and adjust the opening degree of the outflow valve according to the change amount of the outflow temperature.

The change amount of the outgoing water temperature can be obtained by measuring the outgoing water temperature value at predetermined time intervals and then calculating the difference between the measured outgoing water temperature values. Here, if the calculated change amount of the outgoing water temperature is equal to or greater than the first reference change amount, the outgoing water temperature can be seen to rise sharply, and in the case of the sudden increase, the number of times of vibration and the vibration width of the outflow temperature graph can be increased.

Therefore, if it is determined that the sudden rise, the opening degree of the water outlet valve can be fixed to the opening degree at the time of calculating the change amount, and the fixing can be maintained for the first set time. That is, in order to lower the change amount of the outgoing water temperature, the control of the opening degree of the outflow valve according to the outflow temperature can be stopped during the first set time, thereby reducing the change amount of the outflow temperature as shown in FIG. .

Referring to FIG. 4 (a), even in the case of the initial outflow, the outflow temperature may gradually increase over time, and the difference between the outflow temperature and the target temperature may be less than the preset value. Therefore, in this case, the same control can be performed at the time of consecutive outgoing. Hereinafter, a control method at the time of continuous heading will be described.

If it is determined as the continuous outflow, the change amount of the outflow temperature can be calculated as described above, and it can be determined whether the change amount is equal to or greater than the second reference change amount. The second reference change amount is a value smaller than the first reference change amount, and if the second reference change amount is greater than or equal to the second reference change amount,

If the outflow temperature is completely raised, it is expected that the vibration amplitude and the vibration frequency of the outflow-on will be larger than the target vibration amplitude and the vibration frequency, so that the degree of opening of the outflow valve is fixed to the degree of opening at the time of calculating the amount of change . Here, the fixed time may be a second set time, which is shorter than the first set time, and the change of the outflow temperature may be reduced by stopping the control of the outflow valve.

Therefore, by adjusting the degree of opening of the water outlet valve in accordance with the amount of change in the water outlet temperature, the water outlet temperature can be quickly converged to the target temperature and energy consumption due to the water outlet valve adjustment can be reduced through shortening the control time of the water outlet valve You can save.

The present invention is not limited to the above-described embodiments and the accompanying drawings. It will 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 by the appended claims, .

10: heater 20: outlet valve
31: Temperature sensor 32: Input temperature sensor
40:
S10: Initial watering step S11: Initial opening setting process
S12: Preheating process S13: Initial opening process
S20: Heading control step

Claims (15)

A heater for heating the incoming water to a heat capacity of the heater;
An outflow valve for regulating the amount of water coming out of the heater;
A temperature sensor for measuring an outflow temperature of the water to be dispensed; And
And a control unit for determining whether the hot water extraction is the first outgoing or continuous outgoing based on the difference between the outgoing water temperature and the target temperature and adjusting the opening degree of the outflow valve in consideration of the change amount of the outgoing water temperature according to the result of the determination, Supply device.
delete The method according to claim 1,
And a voltage sensing unit for sensing a supply voltage supplied from a power source,
Wherein the control unit calculates the heat capacity of the heater using the supply voltage and sets the degree of opening of the water outlet valve using the heat capacity and the difference between the outgoing temperature and the target temperature.
The apparatus of claim 3, wherein the voltage sensing unit
A hot water extraction signal requesting hot water extraction is inputted or a hot water supply device senses the supply voltage when a predetermined time interval elapses.
The apparatus of claim 3, wherein the voltage sensing unit
A hot water supply device for converting a supply voltage inputted into an AC into a DC voltage and quantizing the converted DC voltage to detect a magnitude of the supply voltage.
4. The apparatus of claim 3, wherein the control unit
Wherein the heater sets a proportional constant corresponding to a heat capacity and sets an opening degree of the outflow valve in proportion to a difference between the outgoing temperature and the target temperature.
The apparatus of claim 1, wherein the control unit
And when the difference between the outgoing water temperature and the target temperature is equal to or greater than a predetermined value, it is determined as the first outflow, and when it is determined that the first outflow is equal to or more than the first reference change amount, And maintains the opening degree of the water outlet valve for a first set time.
The apparatus of claim 1, wherein the control unit
And when the difference between the outgoing water temperature and the target temperature is less than a predetermined value, it is determined that the water outflow is continuous. If the change in the outflow temperature is determined to be continuous water outflow, And maintains the opening degree of the water outlet valve for a second predetermined time.
An initial watering step of setting an initial opening degree of an outflow valve for regulating an amount of water to be dispensed from the heater when the hot water supply signal is inputted and opening the outflow valve by the set degree of opening; And
Wherein the control unit determines whether the hot water extraction is the first outgoing water or the continuous outgoing water based on the difference between the outgoing water temperature and the target temperature of the outgoing water and controls the opening degree of the outflow valve in consideration of the change amount of the outflow temperature, RTI ID = 0.0 > 1, < / RTI >
10. The method according to claim 9,
Wherein the heater further comprises a heat capacity calculation step of measuring a supply voltage supplied from a power source and calculating a heat capacity of the heater using the supply voltage.
The method of claim 10, wherein the heat capacity calculation process
Wherein the hot water extraction signal requesting the hot water extraction is input or the heater measures the heat capacity by measuring the supply voltage when a predetermined time interval elapses.
The method of claim 10, wherein the heat capacity calculation process
A supply voltage of the AC supplied from the power supply is converted into a DC voltage, and a magnitude of the supply voltage is measured by quantizing the converted DC voltage.
delete 10. The method according to claim 9, wherein the step
And when the difference between the outgoing water temperature and the target temperature is equal to or greater than a predetermined value, it is determined as the first outflow, and when it is determined that the first outflow is equal to or more than the first reference change amount, And the degree of opening of the water outlet valve is maintained for a first set time.
10. The method according to claim 9, wherein the step
And when the difference between the outgoing water temperature and the target temperature is less than a predetermined value, it is determined that the water outflow is continuous. If the change in the outflow temperature is determined to be continuous water outflow, And the degree of opening of the water outlet valve is maintained for a second predetermined time.

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