RU2621932C2 - Hot water supplying device and method of hot water supply - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: device contains: a heater of injected water; an exhaust valve, regulating the amount of water exhausted from the heater; a water exhaust temperature sensor and a controller, determining whether the hot water release is the first water release or the continuous water release, based on the difference between the exhaust temperature and the target temperature and controlling the opening degree of the exhaust valve, based on the calculated change in the exhaust temperature according to the determination results. At that the initial release operation is performed, which is included in the exhaust valve initial opening degree assignment and the valve opening to the predetermined degree, when the hot water supply signal is introduced; and the exhaust control operation, which is included in determination whether the hot water release is the first water release or the continuous water release, based on the difference between the exhaust temperature and the target temperature, and in the exhaust valve opening degree control, based on the calculated exhaust temperature change according to the determination results.

EFFECT: minimisation of the exhaust temperature fluctuations.

13 cl, 5 dwg

Description

Technical field

The present invention relates to a hot water supply device and a hot water supply method, and in particular, to a direct type hot water supply device and a direct type hot water supply method for quickly dispensing water.

State of the art

A hot water dispenser used in water purifiers or the like can be classified as a hot water dispenser of the type with a water tank in which the heater is installed in the water tank, or a direct type hot water dispenser in which water is heated with using a heater when necessary.

The hot water supply device of the type with a water tank filters the room temperature water supplied by the water source using a filter or the like to obtain purified water suitable for drinking, heats the purified water stored in the water tank and supplies the heated water to the user . In this case, the hot water supply device of the type with a water tank includes a purified water tank storing filtered purified water having a room temperature and a hot water tank storing hot water heated to a certain temperature. It may be of such a design that purified water is supplied to the hot water tank and heated by a heater installed in the hot water tank to turn into hot water.

However, in the hot water supply device of the type with a water tank, the temperature of the water in the water tank must be maintained at a predetermined level, regardless of whether hot water is used, which leads to energy consumption during downtime, and because of the need additional hot water tank may require sufficient space. In addition, from the point of view of the properties of water having a high specific heat capacity, an idle time of from several tens of seconds to several minutes is required.

As a result, a direct-type hot-water supply device has recently been used that instantly heats and supplies water in accordance with a user request for hot-water supply, but even a direct-type hot water supply device cannot provide hot water having a desired temperature desired by the user, at the initial stage of water discharge.

Disclosure of invention

Technical problem

According to one aspect of the present invention, there is provided a direct type hot water supply device and a direct type hot water supply method for quickly dispensing water.

Solution

According to one aspect of the present invention, there is provided a hot water supply device, comprising: a heater heating the introduced water due to the heating ability of the heater; an exhaust valve regulating the amount of water discharged from the heater; a temperature sensor measuring the temperature of the discharged water; and a controller proportionally controlling the degree of opening of the exhaust valve in accordance with the difference between the discharge temperature and the target temperature.

In this case, the controller can calculate the change in the temperature of the outlet and adjust the degree of opening of the exhaust valve in accordance with the calculated change.

In this case, the hot water supply device may further include: a voltage measuring unit measuring a supply voltage supplied by the power source, the controller can calculate the heating ability of the heater using the supply voltage and set the degree of opening of the exhaust valve using the heating ability of the heater and the difference between the outlet temperature and target temperature.

In this case, the voltage measuring unit can measure the supply voltage if a hot water output signal is inputted to request hot water delivery or if a predetermined time interval has passed.

In this case, the voltage measuring unit can convert the supply voltage applied as an alternating voltage into a constant voltage and quantize the converted constant voltage in order to measure the magnitude of the supply voltage.

In this case, the controller can set the proportionality coefficient corresponding to the heating ability of the heater, and set the degree of opening of the exhaust valve so that it is proportional to the difference between the discharge temperature and the target temperature.

Moreover, if the difference between the outlet temperature and the target temperature is equal to or greater than a predetermined value, and the calculated change is equal to or greater than the first reference change, the controller can maintain the degree of opening of the exhaust valve at the time when the change was calculated, during the first predetermined period of time.

Moreover, if the difference between the outlet temperature and the target temperature is less than a predetermined value, and the calculated change is equal to or greater than the second reference change, the controller can maintain the degree of opening of the exhaust valve at the time when the change was calculated for a second predetermined period of time.

According to a further aspect of the present invention, there is provided a method for supplying hot water, comprising: an initial discharge operation comprising setting an initial degree of opening of an exhaust valve that controls the amount of water discharged from the heater and opening the exhaust valve to a predetermined degree of opening if a hot water supply signal is received; and an exhaust control operation of adjusting the discharge temperature of the water discharged from the heater so that it reaches the target temperature by proportionally controlling the degree of opening of the exhaust valve in accordance with the difference between the discharge temperature and the target temperature.

The initial release operation may further include: an operation for calculating a heating ability of a heater, comprising measuring a supply voltage supplied by a power source, and calculating a heating ability of a heater using a supply voltage.

During the operation of calculating the heating ability of the heater, if a hot water output signal is inputted to request the delivery of hot water, or if a predetermined time interval has passed, the heating ability of the heater can be calculated by measuring the supply voltage.

During the operation of calculating the heating ability of the heater, the alternating voltage supplied by the power source can be converted to a constant voltage, and the converted constant voltage can be quantized to measure the magnitude of the supply voltage.

In this case, during the exhaust control operation, a change in the value of the exhaust temperature can be calculated, and the degree of opening of the exhaust valve can be adjusted in accordance with the calculated change.

Moreover, during the exhaust control operation, if the difference between the exhaust temperature and the target temperature is equal to or greater than a predetermined value, and the calculated change is equal to or greater than the first reference change, then the degree of opening of the exhaust valve can be maintained during the first predetermined time period at the time the change was calculated.

At the same time, during the exhaust control operation, if the difference between the exhaust temperature and the target temperature is less than a predetermined value, and the calculated change is equal to or greater than the second reference change, then the degree of opening of the exhaust valve at the moment when the change was calculated.

Advantages of the Invention

In the case of using a hot water supply device and a hot water supply method in accordance with embodiments of the present invention, hot water having a target temperature desired by the user may be provided during the initial discharge time.

In addition, since the control operation to obtain the target temperature is reduced to a minimum, the amount of energy required to dispense hot water can be reduced.

In addition, since hot water is obtained taking into account a change in the heating ability of the heater corresponding to a change in the voltage of the AC power source (i.e., the AC network as a power source), it is possible to produce hot water having an exact target temperature. In addition, since the heating ability of the heater is calculated by directly measuring the voltage supplied to the heater, it is possible to provide hot water having the target temperature required by the user in any country where the voltage value of the mains power supply is different.

Brief Description of the Drawings

In FIG. 1 is a structural diagram of a hot water supply device according to an embodiment of the present invention.

In FIG. 2 is a flowchart of a method for supplying hot water according to an embodiment of the present invention.

In FIG. 3 is a flowchart of an initial release operation in a hot water supply method according to an embodiment of the present invention.

In FIG. 4 and 5 are graphs of the temperature of the discharge of water discharged from the hot water supply device according to an embodiment of the present invention.

Detailed Description of Preferred Embodiments

Next, with reference to the accompanying drawings, embodiments of the present invention will be described in detail, which will allow specialists in this field of technology on which this invention is designed to easily implement these options in practice. In describing the present invention, if it is believed that a detailed consideration of the corresponding known function or design unnecessarily distracts from the essence of the present invention, such a consideration will be omitted, but it would be clear to those skilled in the art. In addition, in the description, similar reference signs are used for similar parts.

It must be understood that if an element is referred to as “connected” to another element, it may be directly connected to this other element, or intermediate elements may also be present. In contrast, if an element is referred to as “directly connected” to another element, then there are no intermediate elements. In addition, unless the contrary is explicitly stated, the word “comprise” and variations such as “comprises” or “comprising” should be understood as involving the inclusion of these elements, but not as an exception to any other elements.

In FIG. 1 is a structural diagram of a hot water supply device according to an embodiment of the present invention.

As shown in FIG. 1, a hot water supply device according to an embodiment of the present invention may include a heater 10, an exhaust valve 20, a temperature sensor 31, an input temperature sensor 32, and a controller 40.

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

The heater 10 can heat the introduced water due to the heating ability of the heater. The heating ability of the heater, associated with the energy consumption of the heater 10, can be expressed in watts (W). The heater 10 can evenly heat the introduced water due to a predetermined heating ability of the heater.

The amount of heat that the introduced water receives from the heater 10 may be proportional to the heating ability of the heater and the time (or time period) during which the water is heated by this heater 10. Thus, when the heating ability of the heater 10 is kept constant, the amount of heat that receives the introduced water from the heater 10 may be proportional to the period of time during which the water is heated by the heater 10. Moreover, the period of time during which the introduced water is heated it is heated by the heater 10, it can be determined in accordance with the time required to discharge the introduced water from the heater through the exhaust valve 20, therefore, the heating time can be adjusted in accordance with the degree of opening of the exhaust valve 20.

The operation of the heater in the "On" and "Off" modes can be controlled using the controller 40, and when a signal is supplied to dispense hot water, the controller 40 may include a heater 10 for heating the introduced water due to the heating ability of the heater.

However, when the voltage or current supplied to the heater 10 is not constant, the heating ability of the heater may not be maintained at a constant level. The heating ability of the heater can be calculated using two parameters from the following: voltage U of the heater, current I of the heater and resistance R of the heater (P = U * I = U ^ 2 / R = I ^ 2 * R), and in reality the mains power supply AC supplying energy to the heater 10 may have a voltage change of about 15%. Thus, the voltage supplied to the heater 10 may vary in accordance with a change in voltage in the AC power supply, which may lead to a change in the heating ability of the heater.

In the general case, a change in the voltage of the AC mains power supply is allowed in the range of the permissible error, therefore, the difference in the heating ability of the heater due to voltage changes may not be taken into account. However, when the heating time is short, such as the heating time in the direct type hot water supply device, and hot water having an exact target temperature is required to be supplied, it may be necessary to take into account errors due to voltage changes in the AC power source. As a result, a voltage measuring unit may additionally be required to measure the magnitude of the supply voltage supplied by the AC mains power supply, i.e., the power supply. That is, the heating time for water introduced into the heater 10 can be set taking into account the heating ability of the heater based on the magnitude of the supply voltage measured by the voltage measuring unit.

In more detail, the voltage measuring unit can perform half-wave rectification, smoothing, and lowering the alternating voltage supplied by the power source to convert it to a constant voltage, and quantize the constant analog voltage using an analog-to-digital converter (ADC) to thereby obtain a voltage value nutrition. For example, in the case of using a 220V AC power supply, the voltage supplied by the power supply may vary from 198 V to 253 V due to a change in voltage, and the voltage measuring unit can divide the voltage range into 10 V intervals and measure the voltage power supply at any of the levels of 200 V, 210 V, 220 V, 230 V, 240 V and 250 V. As a result, the controller 40 can calculate the heating ability of the heater based on the corresponding measured supply voltages and set the degree of opening or closing you start valve 20.

However, in order to prevent energy consumption during voltage measurement, the voltage measuring unit can measure the supply voltage only at a predetermined time interval or only when a hot water output signal is input.

In addition to this, the heating ability of the heater can be calculated if either the magnitude of the current or the magnitude of the voltage supplied by the power source is known, so it is also possible to use a current measuring unit measuring the supply current supplied by the power source instead of the voltage measuring unit.

The exhaust valve 20 may adjust the amount of water discharged from the heater 10. As discussed above, by controlling the amount of water discharged from the heater 10, it is possible to adjust the period of time during which the water introduced into the heater 10 is heated. In more detail, when the exhaust valve 20 is open to a greater extent, it is possible to reduce the time required for heating the introduced water by the heater 10, and when the exhaust valve 20 is closed more tightly, it is possible to increase the time required to heat the introduced water by the heater 10. As a result, ate controller 10 may control the temperature of water discharged from heater 10, so that it becomes the target temperature, by controlling the opening degree of the exhaust valve 20.

You can adjust the degree of opening of the exhaust valve 20 by adjusting the size of the cross-sectional area of the open flow channel or the opening time of the exhaust valve 20 in accordance with the control signal from the controller 40.

In this case, the exhaust valve 40 may include a blocking channel for the flow channel, for example, a disk or the like, in order to block part or all of the flow channel through which water is discharged from the heater 10. Moreover, by adjusting the size of the cross-sectional area of the flow channel blocked by the blocking channel for the flow channel, it is possible to adjust the amount of water discharged from the heater 10 per unit area.

In addition, it is possible to control the amount of water discharged from the heater 10 per unit time by periodically reopening and closing the exhaust valve 20 for a short time, and periodically opening and closing the exhaust valve 20 can be realized by pulse width modulation (PWM). For example, the exhaust valve 20 receives a control signal in the form of a pulse with a predetermined period transmitted by the controller 40, and when the pulse has a large value, the exhaust valve 20 is open, and when the pulse has a small value, the exhaust valve 20 may be closed. Moreover, when the number of pulses of a large magnitude from the number of pulses transmitted by the controller 40 increases, the exhaust valve may discharge more water from the heater 10 per unit time.

Thus, using the exhaust valve 20, it is possible to determine the amount of water discharged per unit time, i.e., the rate of discharge of water entering the heater 10. When the discharge rate increases, the period of time during which the water entering the heater 10 is reduced is heated in this heater, therefore, it is possible to lower the temperature of the water discharged from the heater 10. And, conversely, when the discharge speed decreases, the period of time during which the water entering the heater 10 remains at m heater, whereby the heating time of the water received by the heater 10 increases, and increases the temperature of water obtained from a heater.

In this case, the degree of opening of the exhaust valve 20 can be adjusted gradually from the degree of full opening to the degree of complete overlap, or the degree of opening can be set in accordance with a predetermined number of stages. For example, the degree of opening can be divided into four stages from the degree of full opening to the degree of complete overlap. That is, the first stage can be a complete overlap, the second stage can be a 1/3 open, the third stage can be a 2/3 open, and the fourth stage can be a full open. In this case, you can set the degree of opening of the exhaust valve 20 with a predetermined number of stages using a stepper motor.

In this case, the exhaust valve 20 may have an initial degree of opening set in such a way that it is possible to control the temperature of the outlet at the initial outlet as the target temperature. That is, in order to dispense water having a target temperature starting from the moment that water is obtained from the heater 10, the initial degree of opening of the exhaust valve can be set by the controller 40.

The discharge temperature of the discharged water can be measured by a temperature sensor 31. Any sensor can be used as a temperature sensor, provided that it can measure the temperature of the water. As shown in FIG. 1, a temperature sensor 31 may be installed between the exhaust valve 20 and the heater 10. As a result, when the exhaust valve 20 is completely shut off, the discharge temperature measured by the temperature sensor 31 may be the temperature of the water stored in the heater 10.

A hot water dispenser in accordance with one embodiment of the present invention may further include an input temperature sensor 32. The inlet temperature sensor 32 can measure the temperature of the inflow of water flowing into the heater 10. The measured inflow temperature can later be used to set the initial degree of opening of the exhaust valve 20.

When a hot water output signal is supplied, the controller may actuate the heater 10, and to release water having a target temperature starting from the initial discharge of water, the controller may set the initial opening degree of the exhaust valve 20.

As discussed above, the discharge temperature measured by the temperature sensor 31 may be equal to the temperature of the water stored in the heater 10. As a result, by differentiating the initial degree of opening of the exhaust valve 20 in accordance with the temperature of the discharge, in the case of the initial discharge of water, it is possible to experimentally obtain the most suitable the degree of opening of the exhaust valve 20. That is, as the initial degree of opening of the exhaust valve 20, a predetermined degree of opening can be set in accordance with the measured discharge temperature, as a result of which, starting with the initial release of water, water can be released at a temperature close to the target.

In this case, the controller 40 can measure the waiting time for use between the last moment of water discharge and the next moment of water discharge, and set the initial degree of opening of the exhaust valve 20 in accordance with the waiting time for use and the temperature of the discharge. That is, the controller 40 can set the initial degree of opening, taking into account the waiting time for use, as well as the temperature of release.

In addition, the controller 40 can obtain the inflow temperature of the water introduced into the heater 10, and calculate the amount of water that needs to be discharged from the heater using the obtained inflow temperature, the heating ability of the heater, and the target temperature. Thus, the controller 40 can set the initial degree of opening of the exhaust valve 20 using the calculated amount of discharged water.

, и может задавать первоначальную степень открытия выпускного клапана 20 в соответствии с вычисленным количеством выпускаемой воды. То есть, контроллер 40 может задавать первоначальную степень открытия выпускного клапана 20 более точно при получении температуры втекания от датчика 32 температуры ввода. Здесь V - объем выпускаемой воды, w - нагревательная способность нагревателя 10, с - удельная теплоемкость воды,

- плотность воды,

- время нагрева, Т1 - целевая температура и Т2 - температура втекания.For example, the controller may calculate the initial amount of water discharged from the heater 10 using the equation

, and can set the initial degree of opening of the exhaust valve 20 in accordance with the calculated amount of discharged water. That is, the controller 40 can set the initial degree of opening of the exhaust valve 20 more precisely when receiving the inflow temperature from the input temperature sensor 32. Here V is the volume of water discharged, w is the heating ability of the heater 10, s is the specific heat of water,

- density of water,

is the heating time, T1 is the target temperature, and T2 is the inflow temperature.

After the initial discharge of water, the controller 40 can control the degree of opening of the exhaust valve in accordance with the change in the value of the discharge temperature.

As discussed above, the temperature of the water flowing into the heater 10 can be increased in proportion to the heating ability of the heater and the heating time of the heater 10.

In general, the heating ability of the heater is maintained constant, so the controller 40 can control the heating time during which the introduced water is heated by the heater by adjusting the degree of opening of the exhaust valve 20. As a result, the controller 40 can control the temperature of the water discharged from the heater 10 in this way so that it is the target temperature by adjusting the degree of opening of the exhaust valve 20 in accordance with the discharge temperature measured by the temperature sensor 31.

In more detail, the controller 40 can obtain the difference between the outlet temperature and the target temperature and control the degree of opening of the outlet valve 20 so that the degree of opening is proportional to this difference. That is, when the outlet temperature is higher than the target temperature, the controller can open the inlet valve to a degree proportional to the difference between the outlet temperature and the target temperature, and when the outlet temperature is lower than the target temperature, the controller 40 can shut off the outlet valve to a degree proportional to the difference between the target temperature and release temperature. In this case, when controlling the degree of opening of the exhaust valve 20, the degree of this opening can be set using the proportionality expression generated in accordance with the difference between the outlet temperature and the target temperature or using a table created experimentally in accordance with the outlet temperature.

However, as mentioned above, the heating ability of the heater 10 may change with a change in the voltage of the AC power source. Thus, in order to more accurately control the temperature, in the preferred case, the initial degree of opening of the exhaust valve is set even taking into account a change in the heating ability of the heater due to a change in the voltage of the AC power source.

To this end, the heater 10 may further include a voltage measuring unit measuring a supply voltage supplied by the power source, and the controller 40 may obtain a heating ability of the heater based on the supply voltage. In more detail, the voltage value actually applied in the heater 10 can be obtained from the supply voltage, and the actual heating ability of the heater 10 can be calculated using the voltage in the heater. That is, the controller 40 can calculate the actual heating ability of the heater by substituting the resistance and voltage of the heater 10 into the equation P = U * I = U ^ 2 / R.

First, to set the initial degree of opening of the exhaust valve 20 in accordance with the discharge temperature, the controller 40 may use the actual calculated heating ability of the heater. That is, although the discharge temperature is the same, if the measured heating ability of the heater is different, the initial degree of opening may differ, and the most suitable degree of opening of the exhaust valve 20 can be obtained experimentally in accordance with the temperature of the outlet at the initial discharge of water and the measured heating heater ability. As a result, the opening degree set in accordance with the measured discharge temperature and the heating ability of the heater can be set as the initial opening degree of the exhaust valve 20, as a result of which water can be discharged whose temperature is close to the target starting from the time of the initial release of water.

. В этом случае нагревательная способность нагревателя может быть вычислена на основе напряжения, реально приложенного в нагревателе 10, исходя из которого регулируют первоначальную степень открытия выпускного клапана 20, что позволяет более точно регулировать температуру.In addition, when the inflow temperature for the water introduced into the heater 10 is obtained, the initial amount V of water discharged from the heater 10 can be calculated by replacing the heating ability w of the heater with the actual calculated heating ability of the heater in the equation

. In this case, the heating ability of the heater can be calculated on the basis of the voltage actually applied in the heater 10, based on which the initial degree of opening of the exhaust valve 20 is regulated, which allows more accurate temperature control.

After the initial discharge of water, the controller 40 can use the actual calculated heating ability of the heater to control the degree of opening of the outlet valve 20 in accordance with the change in the value of the outlet temperature. In more detail, a proportionality coefficient can be set for the heating ability of the heater, and the degree of opening of the exhaust valve 20 can be set in proportion to the difference between the discharge temperature and the target temperature. When adjusting the degree of opening of the exhaust valve 20, this degree can be set using an expression of proportionality generated in accordance with the heating ability of the heater and the difference between the exhaust temperature and the target temperature or using a table created experimentally in accordance with the heating ability of the heater and the temperature of the discharge.

For example, the supply voltage measured by the voltage measuring unit may be quantized to 200 V, 210 V, 220 V, 230 V, 240 V and 250 V, and there may be a proportionality coefficient previously set in accordance with each value of the supply voltage. As a result, the degree of opening of the exhaust valve 20 can be adjusted using the proportionality coefficient and the discharge temperature. Moreover, the coefficient of proportionality can be obtained experimentally.

In this case, the controller 40 directly calculates the heating ability based on the supply voltage measured by the voltage measuring unit, so it can perform control in accordance with the change in the voltage of the AC power source. Thus, hot water having the target temperature requested by the user can be obtained without performing the setup process even in any country where the voltage range of the AC mains power supply is different. That is, an unchanged result can be ensured even in any country where the voltage range of the AC mains power supply is different.

However, the hot water supply device is a direct type device, therefore, although the initial degree of opening of the exhaust valve 20 is set in accordance with the discharge temperature, heating of the introduced water may not be sufficient and water may be provided that does not have a target temperature. In this case, the user releases water, expecting that the hot water supply device provides water having a target temperature, therefore, for this device it is important to provide water having a target temperature even at the time of initial water discharge.

Thus, if the temperature of the water stored in the heater 10 is lower than the reference preheating temperature, the controller 40 may activate the heater 10 during the preheating period before the outlet valve 20 opens.

That is, before discharging the water stored in the heater 10, this water can be initially heated during the initial heating to increase the temperature, after which the water can be discharged. In this case, the reaction time can be increased by the time taken by the preheating after the user has entered a hot water output signal requesting the supply of hot water, but the target water temperature required by the user can be ensured starting from the initial moment of water discharge.

In this case, the hot water supply device can supply hot water again immediately after it is supplied to the user. In this case, since the temperature of the water available in the heater 10 is already close to the target temperature, preheating may not be necessary. Conversely, a hot water supply device can supply hot water, a long time after it is supplied to the user. For example, a hot water dispenser may supply hot water two hours after the initial supply of hot water. In this case, the water available in the heater 10 may cool, and its temperature may differ significantly from the target temperature.

Thus, the controller can check 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 lower than the reference preheating temperature, for example, 60 degrees or lower.

In addition, the controller 40 can set the pre-heating time so that it increases when the temperature of the water stored in the heater 10, that is, the discharge temperature, is lower. Since the difference between the discharge temperature and the target temperature increases, the pre-heating time can be set to increase in order to heat the water stored in the heater 10 in a sufficient manner. Conversely, if the discharge temperature is high, since the temperature is close to the target temperature, the water stored in the heater 10 can be heated for a short period of time sufficient to reach the target temperature.

In addition, the controller 40 can measure the waiting time for use between the last moment of water discharge and the next moment of release and set the pre-heating time and the degree of opening of the exhaust valve 20 in accordance with the measured discharge temperature.

When the input of the hot water supply signal is stopped, the hot water supply device can completely shut off the exhaust valve 20 to stop the supply of hot water, in which case the water stored in the heater 10 may be in a state of heating to a target temperature. However, in this case, if the hot water dispenser after this no longer works, the temperature of the water stored in the heater 10 may decrease over time. As a result, the degree of opening of the exhaust valve 20 can be set taking into account the waiting time for use, as well as the difference between the target temperature and the discharge temperature.

In addition, in order to quickly dispense water having a target temperature, the controller 40 can adjust the degree of opening of the exhaust valve 20 in accordance with a change in the value of the discharge temperature. The specific operation associated with the operation of the controller 40 will be described with reference to FIG. 4 and 5.

In FIG. 4 (a) shows a graph of the discharge temperature in the case of the initial release of water. That is, in FIG. Figure 4 (a) shows a graph for the case when hot water is discharged after a certain time has passed since the last discharge of water. In FIG. 4 (a), it can be seen that the outlet temperature turns into the target temperature, this can be done by controlling the degree of opening of the outlet valve, as discussed previously.

However, in this case, as shown in FIG. 4 (a), the discharge temperature may fluctuate up and down with respect to the target temperature during the process during which the discharge temperature becomes the target temperature, and in accordance with the fluctuation of the discharge temperature, very hot or cold water may unexpectedly be supplied to the user. In addition, the time required for the discharge temperature to stabilize at the target temperature level may increase. As a result, it may be necessary to control the exhaust valve 20 to minimize fluctuations in the discharge temperature curve.

In FIG. 4 (b) shows a graph of the discharge temperature in the case of continuous discharge of water. Since hot water is dispensed continuously, the discharge temperature does not increase sharply in the initial stage, as in FIG. 4 (a), but fluctuations appear on the discharge temperature curve. As a result, control of the exhaust valve 20 is required to minimize fluctuations.

Thus, the controller 40 can calculate the change in the outlet temperature and adjust the degree of opening of the outlet valve 20 in accordance with the calculated change, thereby minimizing the fluctuation.

First, the controller 40 can calculate the difference between the outlet temperature and the target temperature and determine whether the dispensing of hot water is the first outlet of water or a continuous outlet of water, in accordance with the difference value.

For example, if the difference between the outlet temperature and the target temperature is equal to or greater than the predetermined value, the controller 40 may determine that the hot water output is the first water outlet, and if the difference between the outlet temperature and the target temperature is less than the predetermined value, the controller 40 may determine that the dispensing of hot water is a continuous release of water.

In this case, the difference between the discharge temperature and the target temperature can be obtained in the initial period, when the delivery of hot water begins, in which case the first discharge of water and the continuous release of water can obviously differ.

That is, in the case of the first discharge of water, the temperature of the water stored in the heater 10 may be close to room temperature (approximately 26 degrees Celsius), but in the case of a continuous discharge of water, since the water is already heated, the temperature of the water stored in the heater 10, may be approximately equal to the target temperature (85 degrees Celsius).

Thus, based on the difference between the outlet temperature and the target temperature, the first water outlet and the continuous water outlet can be distinguished, and the outlet valve 20 can be controlled differently in accordance with the first water outlet and the continuous water outlet.

When the hot water outlet is the first water outlet, the controller can calculate the change in the outlet temperature, and the degree of opening of the outlet valve 20 can be adjusted in accordance with the change in the outlet temperature.

A change in the outlet temperature can be obtained by measuring the outlet temperature in each predetermined time interval and calculating the differences between the measured outlet temperature values. Moreover, if the calculated change in the outlet temperature is equal to or greater than the first reference change, we can assume that the outlet temperature increases rapidly, and in this case, the number of oscillations and the amplitude of the oscillations on the curve of the outlet temperature can increase.

Thus, if it is determined that the change is a rapid increase, the degree of opening of the exhaust valve can be fixed at the degree of opening at the point in time when the change is calculated, and a fixed degree of opening can be maintained for a first predetermined period of time. That is, in order to reduce the change in the outlet temperature, controlling the degree of opening of the outlet valve 20 in accordance with the outlet temperature can be stopped for a first predetermined time period, as a result of which the change in the outlet temperature can be reduced, as shown in FIG. 5.

As shown in FIG. 4 (a), even in the case of a first water discharge, the discharge temperature can be gradually increased over time, and the difference between the discharge temperature and the target temperature may be less than a predetermined value. As a result, in this case, the controller 40 can control the degree of opening of the exhaust valve 20 in the same manner as with a continuous discharge of water. Next will be considered the operation of the controller 40 in the case of continuous discharge of water.

When it is determined that the dispensing of hot water is a continuous release of water, as discussed above, it is possible to calculate the change in discharge temperature, and it can be determined whether the change is equal to or greater than the second reference change. The second reference change may have a value less than that of the first reference change. When the change is equal to or greater than the second reference change, it can be considered that the discharge temperature slowly increases.

When the outlet temperature slowly increases, it can be predicted that the amplitude of the oscillations and the number of oscillations on the outlet temperature curve increase, and as a result, the degree of opening of the outlet valve 20 can be fixed to the degree of opening at the point in time when the change was calculated. In this case, the fixed period of time may be a second predetermined period of time that is shorter than the first predetermined period of time, and the change in the temperature of the outlet can be reduced by stopping the control of the exhaust valve 20.

Thus, by controlling the degree of opening of the exhaust valve 20 in accordance with a change in the temperature of the exhaust, the exhaust temperature can be quickly turned into a target temperature, and by reducing the time for controlling the exhaust valve 20, the energy consumption corresponding to the control of the exhaust valve 20 can be reduced.

Although not shown, the hot water dispenser may be part of the water purifier. The water purifier may include a purification filter that filters the tap water supplied by the tap water source, and water purified by the purification filter can be introduced into the heater 10. After that, the purified water can be heated in the heater 10 and then discharged through the exhaust valve 20 to provide the user. In this case, the controller 40 can control the degree of opening of the exhaust valve to regulate the temperature of the discharged water to obtain the target temperature. Similarly, the controller 40 can adjust the degree of opening of the exhaust valve 20 using a temperature sensor 31 and an input temperature sensor 32, and preheat the water introduced into the heater 10 by controlling the heater 10 and the exhaust valve 20.

In FIG. 2 is a flowchart of a method for supplying hot water according to an embodiment of the present invention, and FIG. 3 is a flowchart of an initial release operation in a hot water supply method according to an embodiment of the present invention.

As shown in FIG. 2 and 3, a hot water supply method according to an embodiment of the present invention may include an initial release operation (S10) and an exhaust control operation (S20). The initial release operation (S10) may include an initial opening setting process (S11), a preheating process (S12), and an initial opening process (S13).

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

In the initial discharge operation (S10), when the hot water supply signal is input, the initial opening degree of the exhaust valve is set to control the amount of water discharged from the heater 10, and the exhaust valve may open with a predetermined opening degree. The initial discharge operation (S10) is an operation in which the heater starts to discharge water in accordance with an incoming hot water supply signal. During this operation, an initial degree of opening of the exhaust valve may be set to dispense water having a target temperature starting from the moment of initial release of water.

In more detail, the initial release operation (S10) may include an initial opening setting operation (S11) and an initial opening operation (S13).

In the initial opening setting operation (S11), a predetermined opening degree can be set as the initial opening degree of the exhaust valve according to the outlet temperature.

The discharge temperature can be measured using a temperature sensor located between the heater and the exhaust valve. Before the exhaust valve opens, the discharge temperature may be the temperature of the water stored in the heater. Thus, the temperature of the water stored in the heater can be measured using the outlet temperature before the outlet valve is opened, and the initial degree of opening of the outlet valve can be set in accordance with the measured temperature of the water.

In more detail, the temperature of the water stored in the heater may vary depending on how much time has passed since the last water discharge, so the initial degree of opening needs to be changed in accordance with the temperature of the water stored in the heater.

For example, if one minute has passed since the last water discharge, the temperature of the stored water may be close to the target temperature, so there is no need to heat the water for a long time, and therefore, such an initial degree of opening can be set to allow the release of a relatively large amount of water.

At the same time, if two hours have passed since the last water discharge, the temperature of the stored water may differ significantly from the target temperature, so it may be necessary to heat the water with a heater for a long period of time. In this case, such an initial degree of opening can be set to make it possible to discharge a relatively small amount of water.

Moreover, with regard to the initial degree of opening, depending on the outlet temperature, the most suitable initial degree of opening can be obtained experimentally by changing the initial degree of opening of the exhaust valve in accordance with the measured temperature of the outlet, as a result of which you can pre-set the initial degree of opening of the exhaust valve in accordance with appropriate discharge temperatures.

In addition to this, as discussed above, the temperature of the water stored in the heater may vary in accordance with the amount of time elapsed since the last discharge, i.e. in accordance with the waiting time for the use of water between the last moment of release of water and the next moment of release of water. As a result, during operation (S11), the initial opening task measures the waiting time for use between the last moment and the next moment of water discharge, and the initial degree of opening of the exhaust valve can be set using the waiting time for use and the discharge temperature.

In the operation (S11) of the initial opening task, in addition to the discharge temperature, the inflow temperature of the water introduced into the heater can be further obtained, based on which the initial degree of opening of the exhaust valve can be set.

, и первоначальная степень открытия выпускного клапана может быть задана в соответствии с вычисленным первоначальным выпускаемым нагревателем количеством воды. То есть, первоначальная степень открытия выпускного клапана может быть задана более точно при получении температуры втекания. Здесь V - объем выпускаемой воды, w - нагревательная способность нагревателя 10, с - удельная теплоемкость воды,

- плотность воды,

- время нагрева, Т1 - целевая температура и Т2 - температура втекания.In more detail, the initial amount of water released by the heater having the desired target temperature can be calculated using the equation

, and the initial degree of opening of the exhaust valve can be set in accordance with the calculated amount of water that was originally released by the heater. That is, the initial degree of opening of the exhaust valve can be set more accurately when the inflow temperature is obtained. Here V is the volume of water discharged, w is the heating ability of the heater 10, s is the specific heat of water,

- density of water,

is the heating time, T1 is the target temperature, and T2 is the inflow temperature.

However, in this case, the initial degree of discovery is set on the assumption that the heating ability of the heater is unchanged, but in reality, the heating ability of the heater may vary in accordance with a change in the voltage of the AC power source supplying energy to the heater. Thus, in order to specify a more accurate initial degree of opening of the exhaust valve, it is necessary to take into account the change in the heating ability of the heater.

To this end, the initial release operation (S10) may further include an operation of calculating a heating ability of a heater (not shown), and during a calculation of a heating ability of a heater, a supply voltage supplied by a power source can be measured, and a heating ability of a heater can be calculated using this voltage nutrition.

In more detail, during the operation of calculating the heating ability of the heater, the alternating supply voltage supplied by the power source can be converted to a constant voltage, and the converted constant voltage can be quantized to measure the supply voltage. That is, to turn it into a constant voltage, half-wave rectification, smoothing and lowering can be applied to the alternating voltage supplied by the power source, after which the constant voltage is quantized by the ADC to measure the supply voltage in this way. So, if an alternating voltage of 220V is applied, varying from 198 V to 253 V, it is divided into 10 V intervals to measure it as one of the following: 200 V, 210 V, 220 V, 230 V, 240 V and 250 V. Since the resistance value of the heater is unchanged when the supply voltage is measured, the voltage supplied to the heater can be obtained, and the heating ability of the heater can easily be calculated using the formula P = U * I = U ^ 2 / R.

Thereafter, in the initial opening setting operation (S11), the degree of opening of the exhaust valve can be set using the heating ability of the heater calculated during the operation of calculating the heating ability of the heater. In more detail, during the initial opening setting operation (S11), although the discharge temperature is constant, if the calculated heating ability of the heater is different, the degree of opening of the exhaust valve can be changed, and the most suitable degree of opening of the exhaust valve can be obtained experimentally in accordance with the temperature of the outlet at the time of the initial release of water and the measured heating ability of the heater. As a result, a predetermined opening degree can be set as the initial opening degree of the exhaust valve in accordance with the measured discharge temperature and the heating ability of the heater.

. В этом случае нагревательная способность нагревателя может быть вычислена на основе напряжения, реально подаваемого в нагреватель 10, исходя из которого регулируется первоначальная степень открытия выпускного клапана 20, что позволяет более точно регулировать температуру.In addition, if the inflow temperature of the water introduced into the heater is obtained, the initial amount V of water discharged from the heater 10 can be calculated by replacing the heating capacity w with the actually calculated heating capacity in the above equation

. In this case, the heating ability of the heater can be calculated on the basis of the voltage actually supplied to the heater 10, based on which the initial degree of opening of the exhaust valve 20 is regulated, which allows more accurate temperature control.

In addition, during the operation of calculating the heating ability of the heater, the voltage supplied by the power source, that is, the supply voltage, can be measured at each predetermined time interval, or when a hot water output signal is input. This is to reduce the energy consumption required when measuring the supply voltage.

Although during the initial opening setting operation (S11), the initial degree of opening of the exhaust valve is set to dispense water having a target temperature, if the temperature of the water stored in the heater is too low, the discharged water may not be sufficiently heated, and as a result, water may be provided, not having a target temperature.

Therefore, the initial release operation (S10) further includes a preheating operation (S12). If the measured discharge temperature is lower than the reference preheating temperature, the heater can be used to heat the water stored in it during the preheating period. As a result, if water is discharged after the preheating operation (S12), then water having a target temperature can be discharged from the time of the initial discharging of water.

In more detail, the preheating operation (S12) can be performed if the measured discharge temperature is lower than 60 degrees Celsius, and in case the measured discharge temperature is low, the preheating time is extended to sufficiently preheat the water in the heater.

In this case, the initial opening setting operation (S11) and the preheating operation (S12) can be performed simultaneously, or the preheating operation (S12) can be performed first, and during the initial opening operation (S11) the initial degree of opening of the exhaust valve can be set taking into account the temperature water preheated during the preheating operation (S12).

During the initial opening operation (S13), the exhaust valve may open in accordance with a predetermined opening degree. In performing the initial opening operation step (S11) and the preheating operation (S12), water having a target temperature can be provided, and then the release control operation (S20) can be performed to continuously provide water having the target temperature even with continuous water discharge.

During the exhaust control operation (S20), it is possible to adjust the water discharge from the heater so that it has a target temperature, controlling the degree of opening of the exhaust valve.

In this case, the degree of opening of the exhaust valve can be adjusted in accordance with the change in the value of the exhaust temperature. Speaking in detail, when the outlet temperature is higher than the target temperature, the outlet valve can be opened to a degree proportional to the difference between the outlet temperature and the target temperature, and if the outlet temperature is lower than the target temperature, the outlet valve can be closed by a degree proportional to the difference between the target temperature and release temperature.

If the heating ability of the heater is unchanged, the temperature of the water discharged from the heater may increase in proportion to the length of the period of time during which the water is heated by the heater. When the exhaust valve is opened more strongly, the amount of water discharged per unit time increases, therefore, the period of time during which the water is heated by the heater is reduced. At the same time, when the exhaust valve closes, the amount of water discharged per unit time decreases, therefore, the period of time during which the water is heated by the heater is lengthened.

As a result, during the exhaust control operation (S20), the temperature of the water discharged from the heater can be controlled by adjusting the degree of opening of the exhaust valve, and the temperature of the water discharged from the heater can be adjusted to achieve the target temperature.

In addition, during the outlet control operation (S20), the inflow temperature of the water introduced into the heater can be obtained, and the degree of opening of the exhaust valve can be adjusted using the inflow temperature, the heating ability of the heater, and the target temperature.

In more detail, in order to discharge water having a target temperature, using the inflow temperature, the heating ability of the heater and the target temperature, the desired discharge quantity can be calculated, and the degree of opening of the exhaust valve can be adjusted based on the calculated discharge quantity.

, и степень открытия выпускного клапана можно задавать в соответствии с вычисленным выпускаемым количеством. То есть, при получении температуры втекания степень открытия выпускного клапана может быть задана более точно. Здесь V - объем выпускаемой воды, w - нагревательная способность нагревателя 10, с - удельная теплоемкость воды,

- плотность воды,

- время нагрева, Т1 - целевая температура и Т2 - температура втекания.For example, the amount of water discharged in a heater that is required to discharge water having a target temperature can be calculated using the equation

, and the degree of opening of the exhaust valve can be set in accordance with the calculated discharge quantity. That is, when the inflow temperature is obtained, the degree of opening of the exhaust valve can be set more accurately. Here V is the volume of water discharged, w is the heating ability of the heater 10, s is the specific heat of water,

- density of water,

is the heating time, T1 is the target temperature, and T2 is the inflow temperature.

However, in this case, as discussed above, the heating ability of the heater may vary, therefore, in order to control the temperature more precisely, the degree of opening of the exhaust valve can be controlled using the actual heating capacity of the heater measured during the operation of calculating the heating ability of the heater.

In more detail, a proportionality coefficient proportional to the heating ability of the heater can be set, and the degree of opening of the exhaust valve can be set proportionally to the difference between the discharge temperature and the target temperature. To this end, you can use the heating ability of the heater and the expression of proportionality generated in accordance with the difference between the discharge temperature and the target temperature, or you can use the table created experimentally in accordance with the heating ability of the heater and the temperature of release.

.In addition, if the temperature of the water introduced into the heater is introduced, the amount discharged from the heater can be calculated by replacing the heating ability (w) of the heater with the actual calculated heating capacity of the heater in the equation

.

During the exhaust control operation (S20), in order to quickly dispense water having a target temperature, it is possible to adjust the degree of opening of the exhaust valve using a change in the value of the exhaust temperature.

In FIG. 4 (a) shows a graph of the discharge temperature in the case of the initial release of water. That is, in FIG. Figure 4 (a) shows a graph for the case when hot water is discharged after a certain time has passed since the last water discharge. In FIG. 4 (a), it can be seen that the discharge temperature is converted to the target temperature, and this can be obtained by controlling the degree of opening of the exhaust valve, as discussed above.

However, in this case, as shown in FIG. 4 (a) during a process in which the discharge temperature turns into a target temperature, the discharge temperature may fluctuate up and down with respect to the target temperature, and unexpectedly very hot or cold water may be supplied to the user in accordance with the fluctuation of the discharge temperature. In addition, the time required to stabilize the outlet temperature with its conversion to the target temperature can be increased. As a result, it is necessary to control the exhaust valve in order to minimize fluctuations in the discharge temperature curve.

In FIG. 4 (b) shows a graph of the discharge temperature in the case of continuous discharge of water. Since hot water is dispensed continuously, the discharge temperature does not increase sharply in the initial stage, as in FIG. 4 (a), but fluctuations appear on the discharge temperature curve. Thus, it is required to control the exhaust valve in order to minimize fluctuations.

As a result, during the exhaust control operation (S20), a change in the value of the exhaust temperature is calculated, and the degree of opening of the exhaust valve is adjusted in accordance with the calculated change so as to minimize fluctuations.

In the discharge control operation (S20), the difference between the discharge temperature and the target temperature is first calculated, and according to this difference, it can be determined whether the hot water supply is the first water discharge or the continuous water discharge.

When the difference between the outlet temperature and the target temperature is equal to or greater than the predetermined value, it can be determined that the hot water output is the first water outlet, and when the difference between the outlet temperature and the target temperature is less than the predetermined value, it can be determined that the output hot water is a continuous release of water.

In this case, the difference between the outlet temperature and the target temperature can be obtained at the initial time when hot water begins to be dispensed, in which case the first water outlet and the continuous water outlet can be clearly distinguished.

That is, in the case of the first discharge of water, the temperature of the water stored in the heater may be close to room temperature (approximately 26 degrees Celsius), but in the case of a continuous release of water, since the water is already heated, the temperature of the water stored in the heater 10 may be close to the target temperature (85 degrees Celsius).

As a result, based on the difference between the discharge temperature and the target temperature, the first water discharge and the continuous water discharge can be distinguished, and the discharge valve 20 can be controlled differently in accordance with the first water discharge and the continuous water discharge.

If the dispensing of hot water is the first discharge of water, the controller 40 can calculate the change in the discharge temperature, and the degree of opening of the discharge valve 20 can be adjusted in accordance with the change in the discharge temperature.

A change in the outlet temperature can be obtained by measuring the outlet temperature in each predetermined time interval and calculating the difference between the measured outlet temperature values. Moreover, if the calculated change in the outlet temperature is equal to or greater than the first reference change, we can assume that the outlet temperature increases rapidly, and in this case, the number of oscillations and the amplitude of the oscillations on the outlet temperature curve can increase.

As a result, if it is determined that the change is a rapid increase, the degree of opening of the exhaust valve 20 can be fixed to the degree of opening at the time when this change is calculated, and a fixed degree of opening can be maintained for a first predetermined period of time. That is, in order to reduce the change in the outlet temperature, control of the degree of opening of the outlet valve 20 according to the outlet temperature can be stopped for a first predetermined time period, as a result of which the change in the outlet temperature can be reduced, as shown in FIG. 5.

As shown in FIG. 4 (a), even in the case of a first discharge of water, the discharge temperature may gradually increase over time, and the difference between the discharge temperature and the target temperature may be less than a predetermined value. Thus, in this case, the controller 40 can control the degree of opening of the exhaust valve in the same manner as in the case of continuous discharge of water. Next will be described a control method in the case of a continuous discharge of water.

When it is determined that the delivery of hot water is a continuous release of water, as discussed above, a change in the temperature of the discharge can be calculated and it can be determined whether this change is equal to or greater than the second reference change. The second reference change may be a value less than the first reference change. If the change is equal to or greater than the second reference change, it can be assumed that the discharge temperature is slowly increasing.

If the outlet temperature slowly increases, it can be predicted that the amplitude of the oscillations and the number of oscillations in the water discharge curve increase, and as a result, the degree of opening of the outlet valve 20 can be fixed at the degree of opening at the time when this change was calculated. In this case, the fixed period of time may be a second predetermined period of time that is shorter than the first predetermined period of time, and the change in the temperature of the outlet can be reduced by stopping the control of the exhaust valve 20.

Thus, by adjusting the degree of opening of the outlet valve 20 in accordance with the change in the temperature of the outlet, it is possible to quickly turn the outlet temperature into a target temperature, and by shortening the control time of the outlet valve 20, the energy consumption corresponding to the control of this valve 20 can be reduced.

Although the present invention has been demonstrated and described in relation to its embodiments, it will be apparent to those skilled in the art that modifications and changes can be made without departing from the spirit and scope of this invention as defined in the appended claims.

Claims (19)

1. A hot water supply device comprising: a heater heating the introduced water due to the heating ability of the heater; an exhaust valve regulating the amount of water discharged from the heater; a temperature sensor measuring the discharge temperature of the discharged water; and a controller determining whether the dispensing of hot water is the first outlet of water or a continuous outlet of water, based on the temperature difference between the outlet temperature and the target temperature, and adjusting the degree of opening of the outlet valve based on the calculated change in outlet temperature according to the determination results. 2. The hot water supply device according to claim 1, further comprising a voltage measuring unit measuring a supply voltage supplied by a power source, the controller calculating a heating ability of the heater using the supply voltage, and sets an opening degree of the exhaust valve using the heating ability of the heater and the difference between release temperature and target temperature. 3. The hot water supply device according to claim 2, wherein, if a hot water delivery signal is inputted to request hot water delivery or if a predetermined time interval has passed, the voltage measuring unit measures the supply voltage. 4. The hot water supply device according to claim 2, wherein the voltage measuring unit converts the supply voltage, which is alternating, into a constant voltage and quantizes the converted constant voltage to measure the value of the supply voltage. 5. The hot water supply device according to claim 2, wherein the controller sets the proportionality coefficient corresponding to the heating ability of the heater and sets the degree of opening of the exhaust valve so that it is proportional to the difference between the discharge temperature and the target temperature. 6. The hot water supply device according to claim 1, wherein the controller determines that the hot water supply is the first water outlet if the difference between the outlet temperature and the target temperature is equal to or greater than a predetermined value, and in the case of the first water outlet, the controller maintains a degree opening the exhaust valve at the moment when this change has been calculated, for the first predetermined period of time, if the calculated change is equal to or greater than the first reference change. 7. The hot water supply device according to claim 1, which determines that the dispensing of hot water is a continuous discharge of water if the difference between the discharge temperature and the target temperature is less than a predetermined value, and in the case of continuous discharge of water, the controller maintains the degree of opening of the discharge valve by the moment when this change has been calculated, for a second predetermined period of time, if the calculated change is equal to or greater than the second reference change. 8. A method for supplying hot water, comprising the steps of: perform an initial release operation, consisting in setting the initial degree of opening of the exhaust valve, regulating the amount of water discharged from the heater, and opening the exhaust valve to a predetermined opening degree when the hot water supply signal is input; and performing an outlet control operation, which consists in determining whether the dispensing of hot water is the first outlet of water or a continuous outlet of water, based on the temperature difference between the outlet temperature and the target temperature, and in controlling the degree of opening of the outlet valve based on the calculated change in the outlet temperature according to the determination results. 9. The method of supplying hot water according to claim 8, in which the initial release operation further comprises an operation of calculating a heating ability of a heater, comprising measuring a supply voltage supplied by a power source, and calculating a heating ability of a heater using a supply voltage. 10. The method of supplying hot water according to claim 9, wherein during the operation of calculating the heating ability of the heater, if a hot water output signal is input to request hot water supply or if a predetermined time interval has passed, the heating ability of the heater is calculated by measuring the supply voltage. 11. The method of supplying hot water according to claim 9, in which during the operation of calculating the heating ability of the heater, the alternating voltage supplied by the power source is converted to a constant voltage, and the converted constant voltage is quantized to measure the magnitude of the supply voltage. 12. The method of supplying hot water according to claim 8, in which during the operation of the release control it is determined that the delivery of hot water is the first release of water, if the difference between the discharge temperature and the target temperature is equal to or greater than a predetermined value, and in the case of the first release water during the first predetermined period of time maintain the degree of opening of the exhaust valve at the time when the change was calculated, if the calculated change is equal to or greater than the first reference change. 13. The method of supplying hot water according to claim 8, wherein during the release control operation it is determined that the delivery of hot water is a continuous release of water, if the difference between the discharge temperature and the target temperature is less than a predetermined value, and in the case of continuous release of water, during the second predetermined period of time, the degree of opening of the exhaust valve is maintained at the moment when the change has been calculated, if the calculated change is equal to or greater than the second reference change.

Images