KR20130079080A - Apparatus for supplying hot water and method for the same - Google Patents

Abstract

PURPOSE: A high temperature water supply device and met are provided to reduce time for controlling a discharge valve by rapidly increasing the temperature of water being discharged and adjusting an opening degree of the discharge valve according to the temperature changes in the water. CONSTITUTION: A high temperature water supply device comprises a heater (10), a discharge valve (20), a temperature sensor (31), and a control unit (40). The heater heats flowing water at heater capacity. The discharge valve controls the amount of water being discharged from the heater. The temperature sensor measures the temperature of the water being discharged. The control unit controls the opening degree of the discharge valve in portion to difference between discharge temperature and target temperature.

Description

Apparatus for supplying hot water and method for the same}

The present invention relates to a hot water supply device and a hot water supply method, and more particularly, to a direct type hot water supply device and a hot water supply method to enable hot water intake in a short time.

The hot water supply device used for the water purifier may be classified into a water tank type in which a heater is installed in a water tank, and a direct water type in which water is heated using a heater whenever necessary.

The water tank type hot water supply device may filter the room temperature water supplied from the tap water with a purified water suitable for drinking water using a filter or the like, and then heat it in a predetermined water tank and supply it to the user. At this time, the filtered purified water is stored at room temperature, the purified water, and a hot water tank for storing hot water heated to a constant temperature, the purified water is supplied to the hot water tank is installed in the hot water tank It may be configured to be heated with hot water by the heater.

The water tank type hot water supply device requires a large amount of standby power because the temperature of the water in the water tank must be maintained at a predetermined temperature regardless of whether hot water is used at all times. It may be necessary. In addition, in order to provide a target temperature desired by the user due to the characteristic of the large specific heat, there is a problem that the waiting time takes several tens of seconds to several minutes.

Therefore, in recent years, a direct type hot water supply device for supplying hot water by instantaneously heating water according to a user's hot water supply request has been used, but the direct type hot water supply device also has hot water having a target temperature desired by the user at initial discharge. There was a problem that does not provide.

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

Hot water supply apparatus according to an embodiment of the present invention, the heater for heating the incoming water to the heater heating capacity; An outlet valve for controlling an amount of water discharged from the heater; A temperature sensor measuring a water extraction temperature of the water discharged; And a control unit controlling an opening degree of the water outlet valve in proportion to the difference between the water outlet temperature and the target temperature.

Here, the control unit may calculate a change amount of the water extraction temperature value, and adjust the opening degree of the water outlet valve according to the calculated change amount.

Here, the hot water supply device further includes a voltage sensing unit for sensing a supply voltage supplied from a power source, wherein the controller calculates the heater heating capacity using the supply voltage, and the heater heating capacity and the water extraction temperature are The degree of opening of the outlet valve can be set using the difference of the target temperature.

Here, the voltage detection unit may input the hot water extraction signal for requesting hot water extraction, or detect the supply voltage when a predetermined time interval elapses.

Here, the voltage detection unit may convert the supply voltage input by alternating current into a DC voltage, and quantize the converted DC voltage to detect the magnitude of the supply voltage.

Here, the control unit may set a proportional constant corresponding to the heater heating capacity, and set the opening degree of the water outlet valve in proportion to the difference between the water outlet temperature and the target temperature.

Here, when the difference between the water discharge temperature and the target temperature is equal to or greater than a predetermined value and the calculated change amount is equal to or greater than a first reference change amount, the controller sets the opening degree of the water outlet valve at the time when the change amount is calculated first. You can keep it for hours.

Here, when the difference between the water discharge temperature and the target temperature is less than a preset value and the calculated change amount is equal to or greater than a second reference change amount, the controller sets a second opening degree of the water discharge valve at the time when the change amount is calculated. You can keep it for hours.

The hot water supply apparatus according to an embodiment of the present invention, when the hot water supply signal is input, to set the initial opening degree of the water outlet valve for adjusting the amount of water discharged from the heater, and to open the water outlet valve by the set opening degree Initial extraction stage; And controlling the opening degree of the water outlet valve to adjust the water outlet temperature of the water discharged from the heater to a target temperature, and a water extraction control step of controlling the degree of opening of the water outlet valve in proportion to the difference between the water outlet temperature and the target temperature. It may include.

The initial extraction step may further include a heater heating capacity calculation process of measuring a supply voltage supplied from a power source and calculating a heater heating capacity of the heater using the supply voltage.

Here, in the heater heating capacity calculation process, when a hot water extraction signal for requesting hot water extraction is input or a predetermined time interval elapses, the heater heating capacity may be calculated by measuring the supply voltage.

In the heater heating capacity calculation process, the supply voltage of the AC supplied from the power source may be converted into a DC voltage, and the magnitude of the supply voltage may be measured by quantizing the converted DC voltage.

Here, the water extraction control step, it is possible to calculate the change amount of the water extraction temperature value, and adjust the opening degree of the water outlet valve according to the calculated change amount.

Here, in the water extraction control step, when the water extraction temperature and the target temperature are different from each other by a predetermined value or more and the calculated change amount is greater than or equal to a first reference change amount, the opening degree of the water outlet valve at the time when the change amount is calculated is determined. Can be maintained for 1 set time.

Here, the water extraction control step, if the water discharge temperature and the target temperature is less than the predetermined value, and the calculated change amount is more than the second reference change amount, the opening degree of the water outlet valve at the time when the change amount is calculated It can be maintained for a second set time.

According to the hot water supply apparatus and the hot water supply method according to an embodiment of the present invention, it is possible to quickly provide hot water having a target temperature desired by the user.

In addition, it is possible to minimize the control operation for extracting the target temperature to reduce the energy required during the hot water extraction.

In addition, since hot water is generated in consideration of the change in the heater heating capacity according to the voltage change of the commercial AC power source, hot water having an accurate target temperature can be extracted.

In addition, since the heater heating capacity is calculated by directly measuring the voltage applied to the heater, it is possible to provide hot water having a target temperature desired by a user even in a foreign country where the magnitude of 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 flow chart showing a hot water supply method according to an embodiment of the present invention.
Figure 3 is a flow chart showing the initial water extraction step of the hot water supply method according to an embodiment of the present invention.
4 and 5 are graphs showing the water extraction temperature of the water discharged from the hot water supply apparatus according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement 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.

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

Hereinafter, a hot water supply apparatus according to an embodiment of the present invention with reference to FIG.

The heater 10 may heat the water introduced into the heater heating capacity. The heater heating capacity is related to power consumption of the heater 10 and may be expressed in watts (W). The heater 10 may be constantly heated to a predetermined heater heating capacity for the water introduced.

The amount of heat received by the introduced water from the heater 10 may be proportional to the heater heating capacity of the heater 10 and the time heated by the heater 10. Therefore, when the heater heating capacity of the heater 10 is kept constant, the amount of heat received by the introduced water from the heater 10 may be proportional to the time heated by the heater 10. Here, the time for which the inflowed water is heated by the heater 10 may be determined according to the time taken for the inflowed water to exit the heater 10 through the outlet valve 20. The heating time may be adjusted according to the opening degree of the valve 20.

On and off of the heater 10 may be controlled by the controller 40, and the controller 40 turns on the heater 10 when a hot water extraction signal is input. ) To heat the water introduced into the heater heating capacity.

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

In general, since the voltage fluctuation of the commercial AC power supply is treated as an allowable error range, a difference in heater heating capacity may not be considered, but the heating time is short, such as a direct hot water supply device, If hot water is to be supplied, it is also necessary to consider the error caused by the voltage variation of the commercial AC power supply. Therefore, the commercial AC power source, that is, the voltage sensing unit for detecting the magnitude of the supply voltage for supplying the power supply may further include, in consideration of the heater heating capacity according to the magnitude of the supply voltage measured by the voltage sensing unit The heating time for the water introduced into the heater 10 may be set.

Specifically, the voltage sensing unit converts the DC voltage to a DC voltage by performing half-wave rectification, smoothing, and voltage drop on the AC voltage supplied by the power supply, and quantizes the analog value of the DC voltage with an analog-digital converter. The supply voltage value can be obtained by measuring. For example, in the case of using a 220 V commercial AC power supply, the supply voltage supplied by the power source may vary from 198 to 253 V due to voltage fluctuations, and the voltage sensing unit divides it by 10V intervals, 200V, 210V, 220V, 230V. , 240V. It can be measured with any of 250V. Therefore, the controller 40 may calculate the heater heating capacity based on each measured supply voltage, and set the opening and closing degree of the water outlet valve 20.

However, the voltage sensing unit may detect the supply voltage at predetermined time intervals or only when a hot water extraction signal is input, in order to prevent power waste consumed by the voltage sensing. Since the heater heating capacity can be calculated by knowing the magnitude of any one of voltage and current, a current sensing unit for sensing a supply current supplied by power may be used instead of the voltage sensing unit.

The water outlet valve 20 may adjust the amount of water discharged from the heater 10. As described above, by adjusting the amount of water discharged from the heater 10 by using the discharge valve 20, it is possible to adjust the time that the water introduced into the heater 10 is heated in the heater 10. have. Specifically, the more the opening of the water outlet valve 20, the shorter the time for the inflow of water to be heated by the heater 10, and the more the water outlet valve 20 is blocked, the inflow of water is the heater ( The heating time by 10) may be long. Accordingly, the controller 40 may control the opening degree of the water outlet valve 20 to control the temperature of the water discharged from the heater 10 to a target temperature.

Here, the outlet valve 20 may adjust the opening degree by adjusting the size of the cross-sectional area of the passage to be opened or the opening time of the outlet valve 20 according to the control signal of the controller 40.

Specifically, the water outlet valve 20 may include a disk blocking means such as a disk, and may block some or all of the flow path from which the water is extracted from the heater 10 by the flow blocking means. Here, by adjusting the size of the cross-sectional area of the flow path blocked by the flow path blocking means, it is possible to adjust the amount of water discharged from the heater 10 per unit time.

In addition, the outlet valve 20 may be to adjust the amount of water discharged from the heater 10 per unit time by periodically repeating the opening and closing of the outlet valve 20 in a short time, the periodic outlet valve Opening and closing of 20 may be implemented by pulse width modulation (PWM). For example, the water outlet valve 20 receives a control signal in a pulse form at a constant cycle transmitted by the controller 40, and opens the water outlet valve 20 when the pulse is high. If low, the water outlet valve 20 may be closed. Here, as the number of pulses that are high among the pulses transmitted by the controller 40 increases, the outlet valve 20 may extract more water from the heater 10 per unit time.

Therefore, by using the water outlet valve 20, the amount of water discharged per unit time of the water introduced into the heater 10, that is, the water discharge speed can be determined. The faster the withdrawal speed is, the less time the water flowing into the heater 10 is heated in the heater 10, and thus, the temperature of the water withdrawn from the heater 10 may be lowered. On the contrary, when the withdrawal speed is low, the time that the water flowing into the heater 10 stays in the heater 10 increases, so that the time that the introduced water is heated by the heater 10 increases. The temperature of the water extracted from the heater 10 is increased.

Here, the opening degree of the water outlet valve 20 may be continuously adjusted from full opening to full blocking, or the opening degree may be set according to a preset number of steps. For example, it can be divided into four stages, from full open to full block, 1 step to full block, 2 step to 1/3 open, 3 step to 2/3 open, and 4 step to full open. In this case, the outlet valve 20 may set the opening degree in the 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 water outlet temperature at the time of initial water outlet to the target temperature. That is, the opening degree of the water outlet valve 20 may be set in advance in order to extract water having a target temperature from when water is extracted from the heater 10, and the initial opening degree of the water outlet valve 20 may be set. May be set by the controller 40.

The temperature sensor 31 may measure the water extraction temperature of the water discharged. The temperature sensor 31 may be generally used as long as it can measure the temperature of water. As shown in FIG. 1, the temperature sensor 31 may be provided between the water outlet valve 20 and the heater 10. Therefore, when the water outlet valve 20 is completely shut off, the water outlet 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 temperature sensor 32, the inlet temperature sensor 32 may measure the inlet temperature of the 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 controller 40 may operate the heater 10 when a hot water extraction signal is input, and set an initial opening degree of the water outlet valve 20 to discharge water having a target temperature from the initial water extraction. .

As previously described, at the time of initial extraction, the extraction temperature measured by the temperature sensor 31 may be the same as the temperature of water stored in the heater 10. Therefore, the opening degree of the water outlet valve 20 which is most suitable can be experimentally determined by varying the initial opening degree of the water outlet valve 20 according to the water outlet temperature at the time of initial water outlet. That is, the predetermined opening degree may be set to the initial opening degree of the water outlet valve 20 according to the measured water outlet temperature, and through this, water close to the target temperature may be discharged from the initial water outlet.

Here, the control unit 40 may measure the use waiting time from the last discharge time to the next discharge time, and may set the initial opening degree of the discharge valve 20 according to the use wait time and the discharge water temperature. That is, the initial opening degree may be set in consideration of the water discharge temperature as well as the use waiting time.

In addition, the control unit 40 may receive the inlet temperature of the water received from the inlet temperature sensor 32 to the heater 10, by using the input inlet temperature, the heater heating capacity and the target temperature The amount of water discharged from the heater may be calculated. Therefore, the initial opening degree of the water outlet valve 20 can be set according to the calculated water outlet amount.

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 equation

An initial discharge amount of the water discharged from the heater 10 can be calculated using the initial discharge degree of the discharge valve 20 according to the calculated discharge amount. That is, the inlet temperature may be input from the intake temperature sensor 32 to more accurately set the initial opening degree of the outlet valve 20. Where V is the volume of water withdrawn, w is the heater heating capacity of the heater 10, c is the specific heat of water, ρ is the density of water, Δt is the heating time, T ₁ is the target temperature, and T ₂ is the inlet temperature.

After the initial discharge, the opening degree of the discharge valve 20 can be controlled according to the change of the discharge temperature.

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

Since the heater heating capacity is generally kept constant, the control unit 40 may control the opening time of the water outlet valve 20 to control the time that the inflowed water is heated by the heater 10. . Therefore, 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 water discharged from the heater 10 to a target temperature. Can be.

Specifically, the controller 40 may obtain a difference between the water discharge temperature and the target temperature and control the opening degree of the water outlet valve 20 to be proportional to the difference. That is, when the water outlet temperature is higher than the target temperature, the water outlet valve 20 is opened by an amount proportional to the difference between the water outlet temperature and the target temperature, and when the water outlet temperature is lower than the target temperature, The water outlet valve may be blocked by an amount proportional to the difference of the water outlet temperature. Here, the opening degree control of the water outlet valve 20 may be set using a proportional formula generated according to the difference between the water outlet temperature and the target temperature, or by using an experimentally prepared table table according to the water outlet temperature.

However, as described above, the heater heating capacity of the heater 10 may be varied by the voltage change of the commercial AC power. Therefore, for more accurate temperature control, it is preferable to set the initial opening degree of the water outlet valve 20 in consideration of the change in the heater heating capacity caused by the voltage change of the commercial AC power supply.

To this end, the heater 10 may further include a configuration of a voltage sensing unit for sensing a supply voltage supplied by the power, and the control unit 40 may obtain the heater heating capacity from the supply voltage. Specifically, the heater voltage value actually applied to the heater 10 may be obtained from the supply voltage, and the actual heater heating capacity of the heater 10 may be calculated using the heater voltage. That is, the controller 40 may calculate the actual heater heating capacity by substituting the resistance value of the heater 10 and the terminator voltage into P = V * I = V ^ 2 / R.

First, the controller 40 may use the calculated actual heater heating capacity in order to set the initial opening degree of the water outlet valve 20 corresponding to the water outlet temperature. That is, even if the outlet water temperature is the same, the initial opening degree may be different when the measured heater heating capacity is different, and the outlet valve 10 most suitable according to the outlet water temperature and the measured heater heating capacity at the initial outlet water Can be obtained experimentally. Therefore, the opening degree set according to the measured water extraction temperature and the heater heating capacity can be set to the initial opening degree of the water extraction valve 20, through which the water close to the target temperature can be discharged from the initial water extraction.

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. In addition, when the inflow temperature of the water obtained by the heater 10 is input, the equation

In the method, by substituting the actually calculated heater heating capacity into the heater heating capacity (w), the initial discharge amount (V) of water discharged from the heater 10 may be calculated. In this case, since the heater heating capacity is calculated based on the voltage actually applied to the heater 10, and thus the initial opening degree of the outlet valve 20 is adjusted, more accurate temperature control is possible.

After the initial discharge, the control unit 40 may utilize the actual calculated heater heating capacity even when adjusting the opening degree of the discharge valve 20 according to the change in the discharge water temperature value. Specifically, a proportional constant proportional to the heater heating capacity may be set, and an opening degree of the outlet valve 40 may be set in proportion to the difference between the outlet water temperature and the target temperature. The opening degree of the outlet valve 20 may be controlled by using a proportional expression generated according to the heater heating capacity and the difference between the outlet temperature and the outlet temperature or the target temperature, or an experimentally prepared table table according to the heater heating capacity and outlet temperature. Can be set.

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

Here, since the control unit 40 directly calculates the heater heating capacity based on the supply voltage measured by the voltage sensing unit, it is possible to control the voltage change of the commercial AC power supply. Therefore, it is possible to provide hot water having a target temperature desired by a user even in a foreign country where the voltage range of the commercial AC power source is different. In other words, consistency can be provided even for foreign countries having different voltage ranges of commercial AC power supplies.

However, the hot water supply device is a direct type, even if the initial opening degree of the outlet valve 20 is set according to the outlet temperature, the heating of the incoming water may not be sufficient, and the target temperature is not reached. Water may be provided. However, the user always expects the hot water supply device to provide the water of the target water temperature, so that the user is provided with water having the target water temperature at the time of initial discharge, it is essential for the hot water supply device.

Therefore, when the temperature of the water stored in the heater 10 is equal to or lower than the preheating reference temperature, the controller 40 may operate the heater 10 during the preheating time before opening the outlet valve 20.

That is, before withdrawing the water stored in the heater 10, the preheating may be started after heating the water stored in the heater 10 to increase the temperature. In this case, the response time may be delayed by the time required for the preheating from the time when the user inputs the hot water extraction signal requesting hot water supply, but the target water temperature desired by the user may be provided from the initial discharge.

Here, there may be a case where the hot water supply device supplies hot water again after a short time after supplying hot water to the user. In this case, since the temperature of the water already present in the heater 10 is close to the target temperature, the preheating may not be necessary. On the contrary, after a long time after the hot water supply device supplies hot water to the user, for example, the hot water supply device may supply hot water after 2 hours. In this case, the temperature of the water present in the heater 10 may have a large difference from the target temperature by cooling.

Therefore, the controller 40 checks the temperature of the water stored in the heater 10 by using the temperature sensor 31, and the preheating only when the temperature of the stored water is a preheating reference temperature, for example, 60 degrees or less. Can be done.

In addition, the controller 40 may set the preheating time longer as the temperature of the water stored in the measured heater 10, that is, the water extraction temperature is lower. As the water discharge temperature is lower, the difference with the target temperature becomes larger, so that the preheating time is set to be long so that the water stored in the heater 10 is sufficiently preheated. On the contrary, if the water extraction temperature is high, the temperature is already close to the target temperature, and thus the temperature can be sufficiently reached even when heated for a short time.

Further, the control unit 40 measures the use waiting time from the last withdrawal of the hot water supply device to the next withdrawal, and according to the use waiting time and the measured withdrawal temperature, the preheating time and the withdrawal valve 20 You can set the degree of opening.

When the input of the hot water extraction signal is stopped, the hot water supply device may completely shut off the water outlet valve 20 in order to stop the hot water supply, in this case, the temperature of the water stored in the heater 10 is the target It may be heated to a temperature. However, since the hot water supply device no longer operates, the temperature of the water stored in the heater 10 may gradually cool down as time passes. Therefore, in addition to the temperature difference between the target temperature and the water discharge temperature, the degree of opening of the water outlet valve 20 may be set in consideration of the use waiting time.

In addition, the controller 40 may adjust the opening degree of the water outlet valve 20 according to the change amount of the water outlet temperature value so as to quickly extract water having a target temperature. A detailed operation related to the operation of the controller 40 will be described with reference to FIGS. 4 and 5 below.

4 (a) is a graph showing the water discharge temperature at the time of first discharge, and shows a graph when hot water is discharged after a certain time has elapsed since the last discharge. Referring to FIG. 4 (a), it can be seen that the water outlet temperature converges to a target temperature, which can be obtained by controlling the opening degree of the water outlet valve 20 as described above.

However, as shown in FIG. 4 (a), the water extraction temperature may oscillate up and down based on the target temperature in the process of converging to the target temperature, and the user may unexpectedly have hot water due to the vibration of the water extraction temperature. Or cold water. In addition, the time taken to stabilize to the desired target temperature may be long. Therefore, it is necessary to control the outlet valve 20 to minimize the vibration of the outlet temperature graph.

4 (b) is a graph showing the water discharge temperature at the time of continuous water extraction to continuously extract hot water. Since hot water is continuously being extracted, the hot water temperature does not increase rapidly as shown in FIG. 4 (b), but vibration appears on the hot water temperature graph. Therefore, it is necessary to control the water outlet valve 20 to minimize the vibration.

Therefore, the controller 40 may calculate the amount of change in the water extraction temperature value and adjust the opening degree of the water outlet valve 20 according to the calculated amount of change to reduce the vibration to a minimum.

First, the controller 40 may calculate a difference between the water extraction temperature and the target temperature, and compare the difference to determine whether the hot water extraction is the first water extraction or the continuous water extraction.

If the difference between the water extraction temperature and the target temperature is greater than or equal to a predetermined value, it may be determined as the initial water extraction. If the difference between the water extraction temperature and the target temperature is less than the predetermined value, the water may be determined as the continuous water extraction.

Here, the difference between the water discharge temperature and the target temperature can be obtained at an initial time point at which the hot water extraction starts, and in this case, the initial water discharge and the continuous water discharge can be clearly distinguished.

That is, in the case of the initial discharge, the temperature of the water stored in the heater 10 may be near room temperature (26 degrees), but in the case of the continuous discharge, the temperature of the water stored in the heater 10 is a target because it is already heated. It may be close to the temperature (85 degrees).

Therefore, the initial withdrawal and the continuous withdrawal can be distinguished through the difference between the withdrawal temperature and the target temperature, and the control of the withdrawal valve 20 can be changed according to the initial withdrawal and the continuous withdrawal.

When it is determined that the initial water discharge, the change amount of the water discharge temperature can be calculated, and the opening degree of the water outlet valve 20 can be adjusted according to the change amount of the water discharge temperature.

The change amount of the water extraction temperature may be obtained by measuring the water extraction temperature value at each preset time interval and then calculating the difference between the measured water extraction temperature values. Here, when the calculated change in the discharged water temperature is equal to or greater than the first reference change amount, it can be seen that the discharged water temperature rises sharply.

Therefore, when it is determined that the sudden rise, the opening degree of the water outlet valve 20 can be fixed to the opening degree at the time when the change amount is calculated, and the fixing can be maintained for a first predetermined time. That is, in order to lower the amount of change in the outlet water temperature, the opening degree control of the outlet valve 20 according to the outlet water temperature can be stopped for the first predetermined time, thereby changing the amount of the outlet water temperature as shown in FIG. 5. Can be reduced as well.

Referring to FIG. 4 (a), even in the case of the first water extraction, the water extraction temperature may gradually increase as time passes, and the difference between the water extraction temperature and the target temperature may be less than a predetermined value. In this case, therefore, the same control as in the case of continuous water extraction can be performed. The operation of the control unit 40 at the time of continuous water extraction will be described below.

If it is determined that the continuous withdrawal, as described above, it is possible to determine whether the change amount is greater than or equal to the second reference change amount by calculating the change amount of the discharge water temperature. The second reference change amount is smaller than the first reference change amount, and when the second reference change amount is equal to or greater than the second reference change amount, the discharge water temperature may be considered to be gradually increased.

If the water extraction temperature rises slowly, since the vibration width and the number of vibrations of the water extraction temperature graph can be expected to be greater than the target vibration width and the number of vibrations, the opening degree of the water outlet valve 20 is calculated at the time when the change amount is calculated. Can be fixed to an open degree. Here, the fixed time may be a shorter time than the first predetermined time as the second predetermined time, and the change amount of the water discharge temperature may be reduced by stopping the control of the water outlet valve 20.

Accordingly, by adjusting the opening degree of the water outlet valve 20 according to the change amount of the water outlet temperature, the water outlet temperature can be quickly converged to a target temperature, and the water outlet valve can be shortened by shortening the control time of the water outlet valve 20. (20) can save energy consumption according to the adjustment.

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 the tap water, and the water purified by the water filter may be introduced into the heater 10. Thereafter, the purified water is heated in the heater 10 and then discharged through the extraction valve 20 to be provided to the user. Here, the control unit 40 may control the opening degree of the extraction valve 20 to match the temperature of the extracted water to the target temperature. Similarly, the control unit 40 may adjust the opening degree of the extraction valve 20 by using the temperature sensor 31 and the intake temperature sensor 32, and the heater 10 and the extraction valve 20 The control may preheat the water introduced into the heater 10.

Figure 2 is a flow chart showing a hot water supply method according to an embodiment of the present invention, Figure 3 is a flow chart showing the initial water extraction step of the hot water supply method according to an embodiment of the present invention.

2 and 3, the hot water supply method according to an embodiment of the present invention may include an initial withdrawal step (S10) and the withdrawal control step (S20), the initial withdrawal step (S10) is the initial opening It may include a setting process (S11), a preheating process (S12) and the initial opening process (S13).

Hereinafter, the hot water supply method according to an embodiment of the present invention with reference to FIGS.

In the initial water extraction step (S10), when the hot water supply signal is input, it is possible to set the initial opening degree of the outlet valve for adjusting the amount of water discharged from the heater, and open the outlet valve as much as the set opening degree. The initial water extraction step (S10) is a step in which the heater starts to withdraw water according to the input hot water supply signal, to set the initial opening degree of the water outlet valve to extract water having a target temperature from the initial water extraction It may be.

In detail, the initial water extraction step S10 may include an initial opening setting process S11, a preheating process S12, and an initial opening process S13.

In the initial opening setting process (S11), a preset opening degree may be set as an initial opening degree of the water outlet valve according to the water outlet temperature.

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

Specifically, since the temperature of the water stored in the heater may vary depending on how much time has passed since the last water discharge, 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 may be close to the target temperature when it is within 1 minute from the last discharge, it is not necessary to heat much by the heater, and thus the initial opening degree so that a relatively large amount of water is discharged. Can be set.

On the other hand, when more than 2 hours have elapsed since the last water discharge, since the temperature of the stored water may be significantly different from the target temperature, it is necessary to heat much by the heater. Therefore, the initial opening degree can be set so that a relatively small amount of water is discharged.

Here, the initial opening degree according to the outlet water temperature, by varying the initial opening degree of the water outlet valve in accordance with the measured water outlet temperature can be obtained experimentally to obtain the most suitable initial opening degree, thereby through the The initial opening degree of the outlet valve can be set in advance.

In addition, the temperature of the water stored in the heater before the water discharge may vary according to the time course from the last water discharge, that is, the standby time from the last water discharge to the next water discharge, as shown in the foregoing salping bar. Therefore, in the initial opening setting process (S11), it is possible to measure the use waiting time from the last discharge to the next discharge, and to set the initial opening degree of the discharge valve using the use standby time and the discharge temperature. .

In the initial opening setting process (S11), the inlet temperature of the water flowing into the heater is further input in addition to the outlet water temperature, and the initial opening degree of the outlet valve may be set using this.

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, the equation

An initial discharge amount of the heater required to discharge the water having the target temperature may be calculated by using the controller, and an initial opening degree of the discharge valve may be set according to the calculated discharge amount. That is, the initial opening degree of the outlet valve may be set more accurately by receiving the inflow temperature. Where V is the volume of water withdrawn, w is the heater heating capacity of the heater 10, c is the specific heat of water, ρ is the density of water, Δt is the heating time, T ₁ is the target temperature, and T ₂ is the inlet temperature.

Here, although the initial opening degree is set on the assumption that the heater heating capacity of the heater is constant, the heater heating capacity of the heater may vary according to a voltage change of a commercial AC power supplying power to the heater. . Therefore, it is necessary to consider the change of the heater heating capacity in order to set the initial opening degree of the water outlet valve more accurately.

To this end, the initial water extraction step (S10) may further include a heater heating capacity calculation process (not shown), and the heater heating capacity calculation process measures a supply voltage supplied from a power source, and uses the supply voltage. The heater heating capacity can be calculated.

In detail, the heater heating capacity calculation process may detect the supply voltage by converting a supply voltage of an AC supplied from the power source into a DC voltage and quantizing the converted DC voltage. That is, the half voltage rectification, smoothing, and voltage drop are performed on the AC voltage supplied by the power to convert the DC voltage, and then the DC voltage is quantized by an AD converter to measure the supply voltage. Therefore, if 220V commercial AC power supply, which varies from 198 ~ 253V, is divided into 10V intervals, 200V, 210V, 220V, 230V, 240V. It can be measured with any of 250V. 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 heater heating capacity can be easily calculated using P = V * I = V ^ 2 / R. Can be.

Thereafter, the initial opening setting process (S11) may set the opening degree of the outlet valve using the heater heating capacity calculated in the heater heating capacity calculation process. Specifically, in the initial opening setting process (S11), even if the outlet temperature is the same, if the calculated heater heating capacity is different, the opening degree of the outlet valve may be different, the outlet temperature at the time of initial outlet and the measured According to the heater heating capacity, the most suitable opening degree of the outlet valve can be obtained experimentally. Therefore, the predetermined opening degree may be set as the initial opening degree of the water outlet valve according to the measured water outlet temperature and the heater heating capacity.

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.In addition, when receiving the inflow temperature of the water obtained by the heater, the equation

In the method, by substituting the actually calculated heater heating capacity into the heater heating capacity (w), the initial discharge amount (V) of water discharged from the heater may be calculated. In this case, since the heater heating capacity is calculated based on the voltage actually applied to the heater, and thus the initial opening degree of the outlet valve is adjusted, more accurate temperature control is possible.

In addition, the heater heating capacity calculation process may measure the voltage supplied from the power, that is, the supply voltage only at predetermined time intervals or when a hot water extraction signal is input. This is to save power consumption required for the supply voltage measurement.

Although the initial opening degree of the water outlet valve for extracting the target temperature is set in the initial opening setting process (S11), when the temperature of the water stored in the heater is too low, the heating of the extracted water may not be sufficient. In addition, water that does not reach the target temperature may be provided.

Accordingly, the initial water extraction step S10 further includes a preheating step S12. When the measured water extraction temperature is equal to or less than the preheating reference temperature, the heater may be operated to heat the water inside the heater during the preheating time. When the preheating step 12 is lower than the preheating reference temperature, the preheating step is preheated before the water is discharged. Thus, the water having the target temperature may be discharged from the initial tapping time after the preheating step 12.

Specifically, when the measured water extraction temperature is less than 60 degrees, the preheating process (S12) may be performed. As the measured water extraction temperature is lower, the preheating time may be set longer to allow sufficient preheating.

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, and the initial opening setting process (S11) may be performed by the preheating process (S12). The initial opening degree of the water outlet valve may be set in consideration of the temperature of the preheated water.

The initial opening process 13 may open the outlet valve according to the opening degree of the set outlet valve. The water having a target temperature may be provided by the initial opening setting process (S11) and the preheating process (S12), and the water extraction control step (S20) may be performed to continuously provide the water having the target temperature during the water extraction. Can be.

In the water extraction control step (S20), by controlling the opening degree of the water outlet valve may adjust the water outlet temperature of the water discharged from the heater to the target temperature.

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

If the heater heating capacity of the heater is constant, the temperature of the water discharged from the heater may increase in proportion to the length of time heated by the heater. As the water outlet valve is opened more, the amount of water discharged per unit time increases, so the length of time heated by the heater becomes shorter. On the other hand, when the water outlet valve is cut off a lot, the amount of water discharged per unit time is reduced, so that the time for heating by the heater becomes long.

Therefore, the water discharge control step (S20) may adjust the temperature of the water discharged from the heater by adjusting the opening degree of the discharge valve, it is possible to adjust the temperature of the water discharged from the heater to the target temperature.

In addition, in the water discharge control step (S20), the inlet temperature of the water flowing into the heater may be input, and the opening degree of the outlet valve may be adjusted using the inlet temperature, the heater heating capacity of the heater, and the target temperature.

Specifically, the amount of water required to discharge the water having the target temperature may be calculated using the inflow temperature, the heater heating capacity, and the target temperature, and the opening degree of the outlet valve may be adjusted according to the calculated amount of discharged 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, math

By using it can calculate the amount of water discharged from the heater required to withdraw the water having the target temperature, it is possible to set the opening degree of the water outlet valve in accordance with the calculated amount of water discharged. That is, the opening degree of the water outlet valve can be set more accurately by receiving the inflow temperature. Where V is the volume of water withdrawn, w is the heater heating capacity of the heater 10, c is the specific heat of water, ρ is the density of water, Δt is the heating time, T ₁ is the target temperature, and T ₂ is the inlet temperature.

However, since the heater heating capacity may be variable as in the above salping bar, for more accurate temperature control, the opening degree of the outlet valve may be adjusted by using the actual heater heating capacity of the heater measured in the heater heating capacity calculation process. It is preferable.

Specifically, a proportional constant proportional to the heater heating capacity may be set, and an opening degree of the outlet valve may be set in proportion to the difference between the outlet temperature and the target temperature. To this end, it is possible to set by using a proportional formula generated according to the heater heating capacity and the difference between the discharge water temperature and the target temperature, or by using an experimentally prepared table table according to the heater heating demand and the discharge water temperature.

에서 히터가열용량(w)에 상기 실제 계산한 히터가열용량을 대입하는 방식으로 상기 히터의 출수량을 계산할 수 있다.
In addition, when the temperature of the water obtained in the heater is input, the equation

In the heater heating capacity (w) can be calculated by substituting the actual heater heating capacity calculated in such a way that the water output of the heater can be calculated.

In the water extraction control step (S20), in order to quickly extract the water having the target temperature, the opening degree of the water outlet valve may be adjusted using a change amount of the water outlet temperature value.

4 (a) is a graph showing the water discharge temperature at the time of first discharge, and shows a graph when hot water is discharged after a certain time has elapsed since the last discharge. Referring to Figure 4 (a), it can be seen that the water extraction temperature is converged to the target temperature, which can be obtained by controlling the opening degree of the water outlet valve, as described above.

However, as shown in FIG. 4 (a), the water extraction temperature may oscillate up and down based on the target temperature in the process of converging to the target temperature, and the user may unexpectedly have hot water due to the vibration of the water extraction temperature. Or cold water. In addition, the time taken to stabilize to the desired target temperature may be long. Therefore, it is necessary to control the outlet valve to minimize the vibration of the outlet temperature graph.

4 (b) is a graph showing the water discharge temperature at the time of continuous water extraction to continuously extract hot water. Since hot water is continuously being extracted, the hot water temperature does not increase rapidly as shown in FIG. 4 (b), but vibration appears on the hot water temperature graph. Therefore, it is necessary to control the outlet valve to minimize the vibration.

Therefore, the water extraction control step (S20), it is possible to calculate the change amount of the water extraction temperature value, and to adjust the opening degree of the water outlet valve in accordance with the calculated change amount to reduce the vibration to a minimum.

First, the water extraction control step (S20) may calculate the difference between the water extraction temperature and the target temperature, and compare the difference to determine whether the hot water extraction is the first water extraction or continuous water extraction.

If the difference between the water extraction temperature and the target temperature is greater than or equal to a predetermined value, it may be determined as the initial water extraction. If the difference between the water extraction temperature and the target temperature is less than the predetermined value, the water may be determined as the continuous water extraction.

Here, the difference between the water discharge temperature and the target temperature can be obtained at an initial time point at which the hot water extraction starts, and in this case, the initial water discharge and the continuous water discharge can be clearly distinguished.

That is, in the case of the initial water extraction, the temperature of the water stored in the heater may be near room temperature (26 degrees), but in the case of the continuous water extraction, the temperature of the water stored in the heater is equal to the target temperature (85 degrees). Can be close.

Therefore, the initial withdrawal and the continuous withdrawal can be distinguished through the difference between the withdrawal temperature and the target temperature, and the control of the withdrawal valve can be changed according to the initial withdrawal and the continuous withdrawal.

When it is determined as the initial water extraction, the change amount of the water extraction temperature may be calculated, and the opening degree of the water extraction valve may be adjusted according to the change amount of the water extraction temperature.

The change amount of the water extraction temperature may be obtained by measuring the water extraction temperature value at each preset time interval and then calculating the difference between the measured water extraction temperature values. Here, when the calculated change in the discharged water temperature is equal to or greater than the first reference change amount, it can be seen that the discharged water temperature rises sharply.

Therefore, when 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 a first predetermined time. That is, in order to lower the amount of change in the outlet water temperature, the opening degree control of the outlet valve according to the outlet water temperature can be stopped for the first predetermined time, thereby reducing the amount of change in the outlet water temperature as shown in FIG. 5. Can be.

Referring to FIG. 4 (a), even in the case of the first water extraction, the water extraction temperature may gradually increase as time passes, and the difference between the water extraction temperature and the target temperature may be less than a predetermined value. Therefore, in this case, the same control can be performed at the time of continuous water extraction. Hereinafter, the control method at the time of continuous water extraction is demonstrated.

If it is determined that the continuous withdrawal, as described above, it is possible to determine whether the change amount is greater than or equal to the second reference change amount by calculating the change amount of the withdrawal temperature. The second reference change amount is smaller than the first reference change amount, and when the second reference change amount is equal to or greater than the second reference change amount, the discharge water temperature may be considered to increase.

If the water extraction temperature rises slowly, since the vibration width and the number of vibrations of the water extraction temperature may be expected to be greater than the target vibration width and the number of vibrations, the opening degree of the water outlet valve may be fixed to the opening degree at the time when the change amount is calculated. Can be. The fixed time may be shorter than the first set time as a second set time, and the change amount of the outlet water temperature may be reduced by stopping control of the outlet valve.

Accordingly, by adjusting the opening degree of the water outlet valve according to the change amount of the water outlet temperature, the water outlet temperature can be quickly converged to a target temperature, and the energy consumption of the water outlet valve can be reduced by shortening the control time of the outlet valve. You can save.

The present invention is not limited by the above-described embodiment 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: Intake temperature sensor
40:
S10: Initial exit stage S11: Initial opening setting process
S12: Preheating Process S13: Initial Opening Process
S20: exit control step

Claims (15)

A heater for heating the incoming water with a heater heating capacity;
An outlet valve for controlling an amount of water discharged from the heater;
A temperature sensor measuring a water extraction temperature of the water discharged; And
And a control unit controlling an opening degree of the water outlet valve in proportion to the difference between the water outlet temperature and a target temperature.
The apparatus of claim 1, wherein the control unit
The hot water supply device for calculating the change amount of the water discharge temperature, and adjusts the opening degree of the water discharge valve in accordance with the calculated change amount.
The method of claim 1,
Further comprising a voltage sensing unit for sensing a supply voltage supplied from a power source,
The control unit calculates the heater heating capacity using the supply voltage, and sets the opening degree of the water outlet valve using the heater heating capacity and the difference between the water discharge temperature and the target temperature.
The method of claim 3, wherein the voltage sensing unit
And a hot water supply device that detects the supply voltage when a hot water extraction signal for requesting hot water extraction is input or a predetermined time interval elapses.
The method of claim 3, wherein the voltage sensing unit
The hot water supply device for converting the supply voltage input by the alternating current into a DC voltage, and quantizing the converted DC voltage to sense the magnitude of the supply voltage.
4. The apparatus of claim 3, wherein the control unit
And a proportionality constant corresponding to the heater heating capacity and setting an opening degree of the outlet valve in proportion to the difference between the outlet temperature and the target temperature.
3. The apparatus of claim 2, wherein the control unit
If the difference between the water discharge temperature and the target temperature is equal to or greater than a predetermined value and the calculated change amount is equal to or greater than the first reference change amount, hot water for maintaining the opening degree of the water outlet valve at the time when the change amount is calculated for the first predetermined time period. Feeder.
3. The apparatus of claim 2, wherein the control unit
If the difference between the water discharge temperature and the target temperature is less than a predetermined value and the calculated change amount is less than a second reference change amount, hot water that maintains the opening degree of the water discharge valve at the time when the change amount is calculated for a second set time. Feeder.
An initial water extraction step of setting an initial opening degree of the water outlet valve for adjusting the water output amount of water discharged from the heater when the hot water supply signal is input, and opening the water outlet valve by the set opening degree; And
And a water extraction control step of controlling the opening degree of the water outlet valve in proportion to the difference between the water outlet temperature and the target temperature.
The method of claim 9, wherein the initial extraction step
And a heater heating capacity calculation process of measuring a supply voltage supplied from electricity and calculating a heater heating capacity of the heater using the supply voltage.
11. The method of claim 10, wherein the heater heating capacity calculation process
The hot water supply method for calculating the heater heating capacity by measuring the supply voltage when a hot water extraction signal for requesting hot water extraction is input or a predetermined time interval elapses.
11. The method of claim 10, wherein the heater heating capacity calculation process
And converting a supply voltage of an alternating current supplied from the power source into a direct current voltage, and quantizing the converted direct current voltage to measure a magnitude of the supply voltage.
The water extraction control step of claim 9, wherein
Calculating a change amount of the water discharge temperature and adjusting an opening degree of the water discharge valve according to the calculated change amount.
The water extraction control step of claim 13,
If the difference between the water discharge temperature and the target temperature is equal to or greater than a predetermined value and the calculated change amount is equal to or greater than the first reference change amount, hot water for maintaining the opening degree of the water outlet valve at the time when the change amount is calculated for the first predetermined time period. Supply method.
The water extraction control step of claim 13,
If the difference between the water discharge 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, hot water for maintaining the opening degree of the water discharge valve at the time when the change amount is calculated for a second predetermined time period. Supply method.

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