KR20010087158A - Water temperature control method and hot water supply system - Google Patents

Abstract

PURPOSE: A control method of hot water temperature is provided to agree the temperature of hot water with the target water temperature promptly even though the relation between the control position of a hybrid valve and the actual mixing ratio decided by the control position is broken by the hybrid valve. CONSTITUTION: A hot water supply system is set in a standby mode when the hot water supply system is powered on. A controller sets the initial temperature of hot water as 25deg.C. When water is supplied to a water supply pipe, a water temperature operator obtains the temperature of the water on the basis of a mixing ratio obtained from a data table depending on the actual hot water temperature and the control position of a hybrid valve. To agree the actual hot water temperature with the target water temperature, a necessary mixing ratio is calculated. The control unit obtains the control position of the hybrid valve corresponding to the necessary mixing ratio and outputs a position command signal of the control position to a motor driver. A driving signal is output to a stepping motor from the motor driver to operate the control position of the hybrid valve to the control position corresponding to the necessary mixing ratio. Thereby, the actual hot water temperature is agreed with the target water temperature.

Description

Water temperature control method and hot water supply system

The present invention relates to a hot water supply temperature control method and a hot water supply device for controlling a hot water temperature by adjusting a control position of a mixing valve.

Conventionally, as shown in FIG. 4, the bypass pipe 53 which communicates with the water supply pipe 51 connected with the heat exchanger 50, and the hot water supply pipe 52 is formed, and the hot water supplied from the heat exchanger 50 is provided. And the mixing ratio of the water supplied through the bypass pipe 53 with the mixing valve 54 formed at the confluence of the hot water supply pipe 52 and the bypass pipe 53 to supply downstream of the confluence point. A so-called mixing type hot water supply device for controlling the temperature of hot water is known.

In such a hot water supply device, a water flow switch 55 for detecting the presence or absence of water supplied to the water supply pipe 51, a water supply temperature sensor 56 for detecting the temperature of the water supplied to the water supply pipe 51, and a heat exchanger 50. Heat exchange temperature sensor for detecting the temperature of the hot water to be heated in the hot water), and hot water temperature sensor (58) for detecting the temperature of the hot water supplied to the downstream side of the hot water supply pipe 52 and the bypass pipe 53 is formed. do.

Then, while it is detected that water is supplied to the water supply pipe 51 by the water flow switch 55, the detection temperature T _out of the hot water supply temperature sensor 58 (hereinafter, the actual hot water temperature T _out ). Control position of the mixing valve 54 is adjusted by the controller 60 so that the target hot water temperature T _set set by the remote controller 61 is adjusted.

The controller 60 is a temperature T _{in of} the water supplied to the water supply pipe 51 detected by the water supply temperature sensor 56, and hot water supplied from the heat exchanger 50 detected by the heat exchange temperature sensor 57. By recognizing the temperature T _h , it is possible to calculate the necessary mixing ratio R _n , which is a mixing ratio necessary for hot water supply so that the actual hot water temperature T _out becomes the target hot water temperature T _set .

Then, by adjusting the control position of the mixing valve 54 to obtain the necessary mixing ratio R _n calculated in this way, the controller 60 adjusts the actual hot water temperature T _out to the target hot water temperature T _set . Can match. However, in practice, since the mixing valve 54 has a positioning error distributed according to the individual, the controller 60 can immediately obtain the necessary mixing ratio R _n from the control position of the mixing valve 54. It is difficult to operate to the control position.

That is, the controller 60 has a data table 62 which holds a correspondence relationship between the control position of the mixing valve 54 and the mixing ratio assumed to be determined in accordance with the control position. Although the control position of the mixing valve 54 according to (R _n ) is obtained by the data table 62 and the mixing valve 54 is operated to the control position, the mixing ratio actually set by the above-described positioning error is It does not become the necessary mixing ratio (R _n ). Therefore, the actual hot water temperature T _out does not match the target hot water temperature T _set .

Thus, the controller 60 makes a deviation between the actual hot water temperature T _out and the target hot water temperature T _set . In order to solve T (= T _set- T _out ), PI control was performed based on the following equations (1) and (2). Moreover, an integer determined by I ₁ is the experiment of the formula (1) of P ₁ and equation (2), P, I is a unit of the control step of the step motor (59) for varying the control position of the mixing valve (54) Calculated as

P = P ₁ × (T _set- T _out ) (1)

I = I ₁ × ∫ (T _set- T _out ) ... (2)

In PI control, P and I are calculated by the above formulas (1) and (2) to move the control position of the mixing valve 54 by about P + I steps. The operation to reduce T) is performed.

However, the relationship between the control position of the mixing valve 54 and the actual mixing ratio determined in accordance with the control position is not constant due to the dispersion of the individual of the mixing valve 54. For this reason, the constants P ₁ and I ₁ need to be determined in consideration of such individual dispersion of the mixing valve 54. However, even if dispersion occurs by experiment or the like, the actual hot water temperature T _out is quickly changed to the target hot water temperature. The problem is that man-hours are required to determine the integers P ₁ and I ₁ that can be matched to (T _set ). In addition, when a mixing valve exceeding the assumed dispersion range is used, since the PI control is performed based on an inappropriate constant P _{1 and} I _{1 for} the mixing valve, the actual boiling water temperature T _out is increased. There was a problem that the time required to match the target hot water temperature (T _set ) becomes long.

The present invention solves the above problem, and even if the relationship between the control position of the mixing valve and the actual mixing ratio determined by the control position is dispersed by the individual of the mixing valve, the hot water supply temperature is quickly changed to the target hot water temperature. It is an object of the present invention to provide a method of controlling a hot water supply temperature and a hot water supply device which can be matched with the same.

1 is an overall configuration of the hot water supply apparatus of the present invention

2 is a flowchart showing a control procedure of the hot water supply temperature in the hot water supply device shown in FIG.

3 is a graph showing execution results of hot water temperature control in the hot water supply device shown in FIG.

4 is an overall configuration diagram of a conventional hot water supply apparatus

(Explanation of symbols for the main parts of the drawing)

1-Hot Water Heat Exchanger 2-Water Pipe

3-Hot water pipe 4-Bypass pipe

5-Mixing Valve 6-Water Flow Switch

7-Water supply temperature sensor 8-Thermal bridge temperature sensor

9-Hot water temperature sensor 10-Step motor

11-controller 12-remote controller

20-heat source

The present invention has been made to achieve the above object, the control method of the hot water supply temperature of the present invention is a hot water and heat generated in the water supplied from the water supply pipe by a heat exchanger connected to the water supply pipe and the hot water supply pipe and supplied to the hot water supply pipe By adjusting and controlling the control position of the mixing valve for varying the mixing ratio of the mixing ratio of the water supplied to the hot water supply pipe through a bypass pipe communicating the heat supply pipe and the hot water supply pipe by bypassing the heat exchanger. The present invention relates to an improvement of a method of controlling a hot water supply temperature in which the temperature of hot water supplied to a downstream side of a portion where the hot water supply pipe joins the bypass pipe matches a predetermined target hot water temperature.

And an assumed mixing ratio, which is a mixing ratio in accordance with the control position of the mixing valve, obtained from a data table storing a relationship between the control position of the mixing valve and the mixing ratio assumed to be determined in accordance with the control position. The temperature of the water supplied from the water supply pipe is calculated based on the temperature of the hot water supplied from the heat exchanger and the temperature of the hot water supplied downstream of the point where the hot water supply pipe joins the bypass pipe. Based on the temperature of the water and the temperature of the hot water supplied from the heat exchanger, the required mixing ratio, which is the mixing ratio required to obtain the target hot water supply temperature, is calculated, and the control position of the mixing valve is adjusted to the necessary mixing ratio. By setting it as the control position calculated | required from the above, it will be provided to the downstream side of the joining place of the said It is characterized in that the temperature of the hot water supplied to match the predetermined target hot water temperature.

According to the present invention, first, the assumed mixing ratio obtained by the data table, the temperature of the hot water supplied from the heat exchanger, and the temperature of the hot water supplied to the downstream side of the bypass pipe and the joining place of the hot water supply pipe. Based on this, the temperature of the water supplied from the water supply pipe is calculated. The water temperature thus calculated reflects an error of the actual mixing ratio (hereinafter referred to as the actual mixing ratio) determined by the assumed mixing ratio and the control position of the mixing valve. For example, if the mixing ratio is a ratio of the flow rate of the water supplied from the bypass pipe to the flow rate of the hot water supplied from the heat exchanger, when the assumed mixing ratio is larger than the actual mixing ratio, the calculated water temperature is It is actually lower than the temperature of the water supplied to the feed pipe. On the contrary, when the assumed mixing ratio is smaller than the actual mixing ratio, the temperature of the calculated water is actually higher than the temperature of the water supplied to the water supply pipe.

For this reason, the necessary mixing ratio calculated on the basis of the temperature of the water thus calculated and the temperature of the hot water supplied from the heat exchanger becomes a mixing ratio that eliminates the difference between the assumed mixing ratio and the actual mixing ratio. Therefore, when the control position of the mixing valve is placed at the control position obtained from the data table in accordance with the necessary mixing ratio, the difference between the assumed mixing ratio and the actual mixing ratio is dispersed by individual dispersion of the mixing valve. Also, the hot water supply pipe can quickly set the temperature of the hot water supplied to the downstream side of the joining place with the bypass pipe to a predetermined target hot water temperature.

In addition, the hot water supply apparatus of the present invention, which is a specific embodiment of the method for controlling the hot water temperature of the present invention described above, is connected to a water supply pipe and a hot water supply pipe, and supplies hot water generated by heating water supplied from the water supply pipe to the hot water supply pipe. A heat exchanger, a bypass tube for bypassing the heat exchanger to communicate with the water supply pipe and the hot water supply pipe, a mixing valve for controlling a mixing ratio of water supplied from the heat exchanger to the hot water supply pipe, and from the heat exchanger. A heat exchange temperature sensor for detecting a temperature of hot water supplied, a hot water temperature sensor for detecting a temperature of hot water supplied downstream of a place where the hot water pipe joins the bypass pipe, and a detection temperature of the hot water temperature sensor Hot water supply temperature control means for adjusting the control position of the mixing valve and controlling the mixing ratio such that is equal to a predetermined target hot water temperature. The.

And a data table storing a corresponding relationship between the control position of the mixing valve and the mixing ratio assumed to be determined in accordance with the control position, the detection temperature of the heat exchange temperature sensor, the detection temperature of the hot water temperature sensor, Water supply temperature calculating means for calculating a temperature of water supplied from the water supply pipe based on an assumed mixing ratio which is a mixing ratio obtained from the data table in accordance with a control position of the mixing valve, and the water temperature calculated by the water supply temperature calculating means. And a necessary mixing ratio calculating means for calculating a necessary mixing ratio, which is a mixing ratio required to obtain the target hot water temperature, based on the detected temperature of the heat exchange temperature sensor, wherein the hot water temperature control means controls the mixing valve. The position is a control position obtained from the data table in accordance with the necessary mixing ratio. As a result, the detection temperature of the hot water supply temperature sensor is made to coincide with the target hot water temperature.

According to the present invention, first, the water supply temperature is calculated based on the detection temperature of the heat exchange temperature sensor, the detection temperature of the hot water temperature sensor, and the assumed mixing ratio adjusted to the control position of the mixing valve obtained by the data table. The temperature of the water supplied from the water supply pipe is calculated by the means. As described above, the calculated water temperature reflects the difference between the assumed mixing ratio and the actual mixing ratio (hereinafter referred to as the actual mixing ratio) determined by the control position of the mixing valve.

Therefore, based on the temperature of the water calculated by the water supply temperature calculating means, the necessary mixing ratio calculated by the necessary mixing ratio calculating means is based on the difference between the assumed mixing ratio and the actual mixing ratio. The mixing ratio is used to solve the difference between the detected temperature of the hot water supply temperature sensor and the target hot water temperature. Therefore, the hot water supply temperature control means sets the control position of the mixing valve to the control position obtained from the data table in accordance with the necessary mixing ratio, so that the difference between the assumed mixing ratio and the actual mixing ratio is caused by the dispersion of the mixing valve. Even in the case of dispersion, the temperature of the hot water supplied downstream of the place where the hot water supply pipe detected by the hot water supply temperature sensor joins the bypass pipe can be quickly matched with the target hot water temperature.

Further, when the hot water supply device is in the standby state before the start of hot water supply, the necessary mixing ratio calculating means assumes that the temperature of the water calculated by the water supply temperature calculating means is an initial water supply temperature set higher than the temperature of the water to be supplied normally. The required mixing ratio is calculated, and the hot water supply control means sets the control position of the mixing valve to the control position obtained from the data table in accordance with the required mixing ratio calculated in this way.

In the present invention, the necessary mixing ratio calculated by the necessary mixing ratio calculating means in accordance with the initial water supply temperature is higher than the necessary mixing ratio calculated in accordance with the normal temperature of water supplied from the water supply pipe. It is to reduce the amount of hot water supplied. Therefore, when the hot water supply device is in the standby state, the hot water supply control means sets the control position of the mixing valve to a control position that matches the necessary mixing ratio calculating means calculated on the basis of the initial water supply temperature. When it starts, it can prevent abnormally high temperature hot water supply to the downstream side of the place where the said hot water supply pipe joins the said bypass pipe.

Embodiment of the Invention

An example of embodiment of this invention is demonstrated with reference to FIGS. 1 is an overall configuration diagram of a hot water supply device of the present invention, FIG. 2 is a flowchart showing a control procedure of the hot water temperature in the hot water supply device shown in FIG. 1, and FIG. 3 is a control of the hot water temperature in the hot water supply device shown in FIG. This graph shows the execution result for.

Referring to FIG. 1, the hot water supply apparatus of the present invention includes a water supply pipe 2 and a hot water supply tube 3 connected to a hot water heat exchanger 1 (which corresponds to the heat exchanger of the present invention), and a hot water heat exchanger 1. ) Is bypassed to the water supply pipe (2) and the hot water supply pipe (3) and the hot water supply heat exchanger (1) A mixing valve 5 for adjusting a mixing ratio between the hot water supplied from the water supply and the water supplied through the bypass pipe 4, and a water flow switch 6 for detecting the presence or absence of water supplied to the water supply pipe 2; do.

The hot water supply apparatus includes a water supply temperature sensor 7 for detecting a temperature of water supplied to the water supply pipe 2, a heat exchange temperature sensor 8 for detecting a temperature of hot water supplied from the hot water supply heat exchanger 1, and a hot water supply. Hot water temperature sensor 9 which detects the temperature of the hot water supplied downstream of the place where the pipe 3 joins the bypass pipe 4, and the step motor 10 for adjusting the control position of the mixing valve 5; ), A controller 11 for controlling the operation of the hot water supply device, and a remote controller 12 for causing the user to instruct the operation of the hot water supply device.

In the present embodiment, the ratio of the flow rate of the water supplied from the bypass pipe 4 when the flow rate of the hot water supplied from the hot water supply heat exchanger 1 is 1 is supplied from the hot water supply heat exchanger 1. Let it be the mixing ratio of hot water and the water supplied from the bypass pipe (4).

The hot water supply heat exchanger (1) is supplied with hot water from the heat source machine (20) through the hot water circulation pipe (21), and the heat source machine (20) includes a pump (23) for circulating hot water in the hot water circulation pipe (21), The circulation heat exchanger 22 which heats warm water in the warm water circulation pipe 21 by the burner 24 is provided. The heat source 20 controls the amount of combustion of the burner 24 to maintain the temperature of the hot water stored in the hot water heat exchanger 1 at a predetermined temperature (for example, 80 ° C.) so that the hot water circulation pipe 21 is opened. By controlling the temperature of the hot water supplied to the hot water supply heat exchanger (1) through, and controlling the operation of the pump 23 to control the amount of hot water supplied to the hot water heat exchanger (1) through the hot water circulation pipe (21). do. As a result, hot water at a substantially constant temperature (80 ° C.) is supplied from the hot water supply heat exchanger 1 to the hot water supply pipe 3 at a substantially constant pressure.

The controller 11 has a temperature T _out of the hot water supplied downstream of the point where the hot water supply pipe 3 detected by the hot water temperature sensor 9 joins the bypass pipe 4 (hereinafter, the actual hot water temperature). Hot water supply temperature control means 31 for outputting the position control signal P _cm to the motor driver 30 so that (T _out ) is equal to the target hot water temperature T _set set by the remote controller 12; And a data table 32 which stores a correspondence relationship between the control position V _p of the mixing valve 5 and the assumed mixing ratio Rs, which is assumed to be set in accordance with the control position V _p . do.

The controller 11 further includes a temperature T _h (hereinafter referred to as tapping temperature T _h ) and a hot water supply temperature of hot water supplied from the hot water supply heat exchanger 1 detected by the heat exchange temperature sensor 8. (T _out ) and the temperature T _{inc of} the water supplied to the water supply pipe 2 from the assumed mixing ratio R _s according to the control position V _p of the mixing valve 5 obtained by the data table 32 (hereinafter, calculating water temperature (T _inc) quot;) for calculating water temperature calculating means 33, hot water temperature (T _h) and the actual hot water temperature (T _out) and the output water temperature (T _inc) chamber on the basis of hot water And a necessary mixing ratio calculating means 34 for calculating the necessary mixing ratio R _n , which is a mixing ratio required for matching the temperature T _out with the target hot water temperature T _set .

The position control signal P _cm output from the hot water supply temperature control means 31 to the motor driver 30 is matched to the control position V _p of the mixing valve 5. In this embodiment, the hot water temperature control means ( 31), adjusts the control position (V _p) of the mixing valve (5) by controlling the rotational position of the step motor 10 in the range of 0-2000 step.

Here, the controller 11 is configured from the temperature T _in (hereinafter referred to as the actual water supply temperature T _in ) and the tapping temperature T _{h of} the water supplied to the water supply pipe detected by the water supply temperature sensor 7. The necessary mixing ratio R _nr , which is a mixing ratio required for matching the actual hot water temperature T _out with the target hot water temperature T _set , can be calculated by the following equation (3).

R _nr = (T _h -T _in ) / (T _set -T _in )-1

The actual mixing ratio R _s that matches the control position V _p of the mixing valve 5 obtained from the data table 32 and the actual position set in accordance with the control position V _p of the mixing valve 5 are obtained. If the mixing ratio (hereinafter referred to as the actual mixing ratio R _s ) coincides, the control position V _p of the mixing valve 5 is adjusted from the data table 32 in accordance with the necessary mixing ratio R _nr . By setting the control position to be determined, the actual hot water temperature T _out can be matched with the target hot water temperature T _set .

However, in practice, the control position V _p of the mixing valve 5 is influenced by the intrinsic values a and b distributed along the individual of the mixing valve 5, as shown in the following equation (4). Even if the number of control steps of the stepper motor 10 is the same, it is not constant.

(V _p ) = a × number of steps + b ...

Therefore, the estimated mixing ratio (Rs) and the actual mixing ratio ((R _r) is the required mixture ratio calculated by the mismatch, the formula (3) for the control position (V _p) of the mixing valve (5) (R The actual mixing ratio R that is set even if the control position of the mixing valve 5 with respect to _nr is obtained from the data memo 32, and the position control signal P _cm according to the control position is output to the motor driver 30. _r ) does not become the necessary mixing ratio R _nr because it includes the error according to Equation (4), therefore, the actual hot water temperature T _out cannot be matched with the target hot water temperature T _set .

Therefore, the controller 11 performs a process for matching the actual hot water temperature T _out with the target hot water temperature T _set in consideration of the error between the assumed mixing ratio R _s and the actual mixing ratio R _r . The processing will be described below with reference to the flowchart of FIG. 2.

Referring to Fig. 2, when the energization of the hot water supply device is started in STEP 1, the hot water supply device is in a standby state. In step 2, the controller 11 sets the initial value (corresponding to the initial water supply temperature of the present invention) of the calculated water supply temperature T _inc to 25 ° C.

Then, the controller 11 repeatedly executes STEP 4 to STEP 7 while the water flow switch 6 is turned ON in the next STEP 3, that is, while the water is supplied to the water supply pipe 2. STEP 4 is a process by the water supply temperature calculating means 33. The water supply temperature calculating means 33 controls the hot water temperature T _h , the actual water supply temperature T _out , and the control position V of the current state of the mixing valve 5. _p ) Based on the assumed mixing ratio R _s obtained from the data table 32 in accordance with _p ), the temperature of the water supplied from the water supply pipe 2 (hereinafter, the calculated water supply temperature T _inc ) by the following equation (5). S).

T _inc = {(1 + R _s ) × T _out -T _h } / R _s ‥‥‥ (5)

Here, the calculated water supply temperature T _inc reflects an error between the assumed mixing ratio R _s and the actual mixing ratio R _r . That is, when the assumed mixing ratio R _s is larger than the actual mixing ratio R _r , the output water supply temperature T _inc is lower than the actual water supply temperature T _in , and conversely, the assumed mixing ratio R _s is When smaller than the actual mixing ratio R _r , the output water supply temperature T _inc becomes higher than the actual water supply temperature T _in .

In the following STEP 5, the necessary mixing ratio calculating means 34 processes the necessary mixing ratio calculating means 34, and the necessary mixing ratio calculating means 34 uses the following equation (6) from the calculated water supply temperature (T _inc ) and the tapping temperature (T _h ). By this, the necessary mixing ratio R _ns , which is a mixing ratio necessary for matching the actual hot water temperature T _out to the target hot water temperature T _set , is calculated.

R _ns = {(T _h -T _inc ) / (T _set -T _inc )-1 ‥‥‥ (6)

As described above, when the necessary mixing ratio R _ns is calculated based on the calculated water supply temperature T _inc , the required mixing ratio Rns is calculated by the above-described formula (3). Unlike _nr ), it is not an actual mixing ratio R _r but an assumed mixing ratio R _s including an error.

As a result, it obtained the control point (V _p) of the mixing valve (5) corresponding to the required blending ratio (R _ns) calculated by the formula (5) from the data table 32, the control of the mixing valve (5) By setting it as the position V _p , the actual hot water temperature T _out can be matched with the target hot water temperature T _set .

Thus, in the next step 6, the control position of the hot water supply temperature means 31 and the mixing valve 5 corresponding to the required mixing ratio R _ns is obtained from the data table 32, and the subsequent control step is performed to the control position. The aligned position command signal P _cm is output to the motor driver 30. Thereby, the drive signal is output from the motor driver 30 to the step motor 10, and the control position V _p of the mixing valve 5 is operated to the control position matched with the required mixing ratio R _ns . By repeating the processing of STEP4 to STEP7 described above, the actual hot water temperature T _out can be matched with the target hot water temperature T _set .

Fig. 3 shows an example in which the process of STEP7 is executed in the above-described STEP4 when the initial value of the output water supply temperature T _inc is 10 ° C and the target hot water temperature T _set is 45 ° C. The hot water supply temperature T _out , the dotted line indicate the target hot water temperature T _set , and the dashed-dotted line indicate the assumed mixing ratio R _s , respectively. In FIG. 3, the setting of the assumed mixing ratio R _s decreases as the number of processing steps from STEP 4 to STEP 7 progresses, and the actual hot water temperature T _out is quickly converged to the target hot water temperature T _set . It can be seen that.

In addition, when the water flow switch 6 is turned OFF in STEP 3 after the energization is started in STEP 1, that is, in a standby state in which no water is supplied to the water supply pipe 2, it branches from STEP 3 to STEP 5. The necessary mixing ratio calculating means 34 calculates the necessary mixing ratio R _{s assuming that the} calculated water supply temperature T _inc is an initial value (25 ° C.). As a result, when the hot water supply device is in the standby state, the control position V _p of the mixing valve 5 is maintained at the position according to the initial value (25 ° C.), and the actual mixing ratio R _s Hot water supply is started in this extremely small state, and the hot water of abnormally high temperature is prevented from being supplied downstream of the hot water supply pipe 3.

In addition, when the water supply switch 6 is turned on in step 3 and the hot water supply is started, when the water supply to the water supply pipe 2 is stopped, the required mixing ratio R _ns is calculated by the calculated water supply temperature T _inc at the time of stopping. Thus, the mixing valve 5 is maintained at the control position V _p in accordance with the necessary mixing ratio R _ns . Therefore, even in this case, the hot water supply starts with the actual mixing ratio R _r being extremely small. As a result, abnormally high temperature of hot water can be prevented from being supplied downstream of the hot water supply pipe 3.

In addition, in STEP2 of FIG. 2, you may use the water supply temperature T _inc computed in STEP4 just before last hot water supply stop instead of a fixed value (25 degreeC). In this case, since there is not much difference between the water supply temperature at the time of stopping the hot water supply and the water supply temperature at the time of restarting the hot water supply, the control position (V _p ) of the mixing valve 5 during the hot water supply stop is determined. It can be operated in advance near the control position according to the water supply temperature. Therefore, when the hot water supply is resumed, the actual hot water temperature T _out can be stabilized to the target hot water temperature T _set more quickly.

In addition, in this embodiment, although the hot water supply heat exchanger 1 which maintains the hot water stockpiled by the hot water supplied from the heat source machine 20 uniformly (80 degreeC) as the heat exchanger of this invention was used, the gas burner and the said You may use the heat exchanger which heats the water supplied from the water supply pipe 2 using a heater etc.

According to the present invention, even if the relationship between the control position of the mixing valve and the actual mixing ratio determined by the control position is dispersed according to the individual, the method of controlling the hot water supply temperature and the hot water supply device can quickly obtain the target hot water temperature. Can be provided.

Claims (3)

The hot water is generated from the water supplied from the water supply pipe by a heat exchanger connected to the water supply pipe and the hot water supply pipe, and the hot water supplied to the hot water supply pipe, and the bypass pipe communicating with the water supply pipe and the hot water supply pipe by bypassing the heat exchanger. The temperature of the hot water supplied to the downstream side of the place where the hot water supply pipe is fed with the bypass pipe is controlled by adjusting the mixing ratio with the water supplied to the hot water supply pipe and the control position of the mixing valve which varies the mixing ratio. In the control method of the hot water supply temperature to match the target hot water temperature of The assumed mixing ratio, which is a mixing ratio in accordance with the control position of the mixing valve, obtained from a data table storing the relationship between the control position of the mixing valve and the mixing ratio assumed to be determined in accordance with the control position, and the heat exchanger. Calculating the temperature of the water supplied from the water supply pipe based on the temperature of the hot water supplied from the hot water and the temperature of the hot water supplied downstream of the place where the hot water supply pipe joins the bypass pipe, Based on the temperature of the water calculated in this way and the temperature of the hot water supplied from the heat exchanger, a necessary mixing ratio which is a mixing ratio necessary for obtaining the target hot water temperature is calculated, By setting the control position of the mixing valve to the control position obtained from the data table in accordance with the necessary mixing ratio, the temperature of the hot water supplied to the downstream side of the place where the hot water supply pipe joins the bypass pipe is a predetermined target hot water temperature. Control method of the hot water temperature, characterized in that to match with. A heat exchanger connected to a water supply pipe and a hot water supply pipe and supplying hot water generated by heating water supplied from the water supply pipe to the hot water supply pipe, a bypass pipe that bypasses the heat exchanger to communicate the water supply pipe and the hot water supply pipe; A mixing valve for controlling a mixing ratio between hot water supplied from the heat exchanger to the hot water supply pipe and water supplied from the water supply pipe to the hot water supply pipe through the bypass pipe, and detecting a temperature of the hot water supplied from the heat exchanger A heat exchange temperature sensor, a hot water temperature sensor for detecting a temperature of hot water supplied downstream of a place where the hot water pipe joins the bypass pipe, and a detection temperature of the hot water temperature sensor matches a predetermined target hot water temperature Hot water supply device having a hot water temperature control means for controlling the mixing ratio by adjusting the control position of the mixing valve to In, A data table storing a correspondence between the control position of the mixing valve and the mixing ratio assumed to be set in accordance with the control position; The temperature of the water supplied from the water supply pipe is calculated based on the detection temperature of the heat exchange temperature sensor, the detection temperature of the hot water temperature sensor, and the assumed mixing ratio, which is a mixing ratio obtained from the data table in accordance with the control position of the mixing valve. Water supply temperature calculating means, And a necessary mixing ratio calculating means for calculating a necessary mixing ratio, which is a mixing ratio required to obtain the target hot water temperature, based on the water temperature calculated by the water supply temperature calculating means and the detection temperature of the heat exchange temperature sensor, The hot water supply temperature control means sets the control position of the mixing valve to a control position obtained from the data table in accordance with the required mixing ratio so that the detected temperature of the hot water supply temperature sensor matches the target hot water temperature. Hot water device. The method according to claim 2, When the hot water supply device is in the standby state before starting the hot water supply, the necessary mixing ratio calculating means assumes that the temperature of the water calculated by the water supply temperature calculating means is an initial water supply temperature set higher than the temperature of the water to be supplied normally. And a mixing ratio is calculated, and the hot water supply control means sets the control position of the mixing valve to a control position obtained from the data table in accordance with the required mixing ratio calculated in this way.