JP5241576B2 - Hot water system - Google Patents

Description

  The present invention relates to a hot water supply system in which an instantaneous heating type hot water heater is connected in series on the downstream side of a hot water storage tank unit.

  Conventionally, a hot water supply system is known in which an instantaneous heating type gas water heater is connected in series downstream of a hot water storage tank unit that heats hot water in a hot water storage tank by a heat pump (see, for example, Patent Document 1).

  In addition, when a hot water storage tank unit and an instantaneous heating type gas water heater are connected in parallel and hot water is supplied from the hot water storage tank unit side, hot water supplied from the hot water storage tank to the hot water discharge pipe and water supplied from the water supply pipe to the hot water discharge pipe are used. There is known a hot water supply system in which the mixing ratio is adjusted so that the detected temperature of a temperature sensor provided near the downstream side of the connection point between the hot water supply pipe and the water supply pipe becomes the target hot water supply temperature ( For example, see Patent Document 2).

  In this way, by combining the hot water storage tank unit and the instantaneous heating type gas water heater, when the hot water tank runs out, the heating temperature that heats the hot water flowing through the hot water outlet to the target hot water temperature in the gas water heater. Key control. As a result, even if the hot water storage tank runs out, hot water supply at the target hot water supply temperature can be continued.

JP 2000-329401 A JP 2001-165458 A

  In the hot water supply system in which the hot water storage tank unit and the hot water supply device described in Patent Document 1 described above are connected in series, the flow of hot water from the connection point of the hot water supply pipe and the water supply pipe to the outlet of the hot water supply system via the hot water supply device The route becomes longer. And in the hot water supply system which connected the hot water storage tank unit and the hot water heater in series, like the hot water supply system of patent document 2 mentioned above, the hot water supplied from the hot water storage tank to the hot water discharge pipe, and the hot water supply pipe from the hot water supply pipe to the hot water supply pipe When the hot water supply temperature is controlled by performing mixing temperature control that adjusts the mixing ratio with the supplied water, the path from the installation location of the temperature sensor used for the control to the outlet of the hot water discharge pipe becomes long.

  Therefore, the difference between the target hot water temperature and the temperature of hot water supplied from the hot water supply system tends to increase due to the effect of the difference between the temperature detected by the temperature sensor used for control and the temperature of hot water actually supplied from the hot water pipe. .

  Therefore, the present invention provides a hot water supply system in which a hot water storage tank unit and a hot water heater are connected in series, and when performing mixed temperature control to control the hot water temperature, the target hot water temperature and the temperature of hot water to be actually supplied are set. It aims at providing the hot-water supply system which suppressed that a difference became large.

  The present invention has been made to achieve the above object, and includes a hot water storage tank, a hot water pipe connected to the hot water storage tank, a hot water storage pipe connected to the hot water storage tank and the hot water discharge pipe, and the hot water storage tank. Heating means for heating the hot water, a water flow sensor for detecting water flow to the water supply pipe, hot water supplied from the hot water storage tank to the hot water discharge pipe, and water supplied from the water supply pipe to the hot water discharge pipe A mixing ratio changing means for changing the mixing ratio, a hot water storage temperature sensor for detecting the temperature of hot water in the hot water storage tank, and in the middle of the outlet pipe at the downstream side of the connecting portion between the outlet pipe and the water supply pipe. A hot water heater that is provided and heats hot water flowing through the hot water pipe with a heat exchanger; bypasses the hot water heater; and a hot water bypass pipe that communicates the hot water pipe between the upstream side and the downstream side of the hot water heater; Bypass for opening and closing the bypass pipe A mixed temperature sensor that is provided in the vicinity of a connecting portion between the tapping pipe and the feed water pipe and that detects the temperature of hot water supplied to the tapping pipe downstream from the connecting portion, and downstream of the heat exchanger A hot water temperature sensor for detecting the temperature of hot water supplied from the water heater, hot water temperature setting means for setting a target hot water temperature, and water flow by the water flow sensor. When the detected temperature of the hot water storage temperature sensor is higher than the hot water outage determination temperature set according to the target hot water supply temperature, the bypass valve is opened and heating by the hot water heater is prohibited. The mixing temperature changing control is performed by the mixing ratio changing means so as to adjust the mixing ratio so that the detected temperature of the mixing temperature sensor becomes the target hot water supply temperature, the passing water is detected by the passing sensor, and The hot water storage When the detected temperature of the temperature sensor is equal to or lower than the hot water run-off determination temperature, the bypass valve is closed, and heating by the water heater is performed so that the detected temperature of the water heater temperature sensor becomes the target hot water temperature. The present invention relates to a hot water supply system including a temperature control unit that performs heating temperature control.

A hot water outlet temperature sensor provided near the outlet of the hot water pipe and detecting the temperature of hot water supplied from the hot water pipe; and the hot water heater temperature sensor when the heating temperature control is executed. Based on the temperature difference between the detected temperature of the hot water outlet temperature sensor and the detected temperature of the hot water outlet temperature sensor, the inter-sensor correction value setting means , the bathtub and the hot water pipe, the outlet of the hot water pipe and the hot water supply A hot-water pipe connected at a location between the temperature sensor, a hot-water valve that opens and closes the hot-water pipe, and opens the hot-water valve, from the hot water pipe through the hot-water pipe Mode switching means for switching between a hot water filling mode for supplying hot water to the bathtub and a general hot water supply mode for closing the hot water filling valve and supplying hot water from the outlet of the hot water outlet; and the mixed temperature in the general hot water supply mode. When adjustment control is being executed The cooling correction value is set based on the temperature difference between the detected temperature of the mixed temperature sensor and the detected temperature of the hot water outlet temperature sensor when the detected temperature of the hot water outlet temperature sensor reaches the target hot water temperature. A cooling component correction value setting means, and the temperature adjustment control means performs correction for adding the inter-sensor correction value to the target hot water supply temperature when executing the mixed temperature adjustment control in the general hot water supply mode. And when performing the mixed temperature control in the hot water filling mode, the correction for adding the inter-sensor correction value and the cooling component correction value to the target hot water supply temperature is performed .

  In the present invention, when the heating temperature control is being executed, the temperature detected by the water heater temperature sensor is maintained near the target hot water temperature, and therefore the detected temperature of the water heater temperature sensor and the hot water temperature are The temperature difference from the temperature detected by the outlet temperature sensor is an error between the temperature detected by the temperature sensor used for temperature control and the temperature of the hot water actually supplied from the tapping pipe. An error between the temperature detected by the temperature sensor used for temperature control and the temperature of the hot water actually supplied from the tapping pipe also occurs when the mixed temperature control is executed. is assumed.

  Therefore, the mixed temperature adjustment control is performed by correcting the target hot water supply temperature using the inter-sensor correction value set by the inter-sensor correction value setting means when the heating temperature adjustment control is being executed. When executed, it can be expected that the influence of an error between the temperature detected by the mixed temperature sensor and the temperature of hot water actually supplied from the hot water pipe is reduced. And thereby, when performing the said mixing temperature control, it can suppress that the difference of target hot water supply temperature and the temperature of the hot water actually supplied from the said hot water pipe becomes large.

  According to the present invention, the temperature difference between the detected temperature of the mixed temperature sensor and the detected temperature of the hot water supply outlet temperature sensor when the mixed temperature control is being executed in the general hot water supply mode is mainly the hot water supply. It is assumed that it is caused by cooling of hot water when circulating in the vessel. Therefore, the cooling component correction value setting means sets the cooling component correction value based on the temperature difference between the detected temperature of the mixed temperature sensor and the detected temperature of the hot water supply outlet temperature sensor.

  And when the said mixed temperature control is performed in the said hot water filling mode, the said bypass valve is closed, and all the hot water supplied to the said hot water pipe from the connection part of the said hot water pipe and the said water supply pipe is all the said Since it is supplied to the bathtub via the hot water heater and the hot water filling pipe, it is cooled when it flows through the hot water heater. Therefore, when executing the mixed temperature control in the hot water filling mode, the hot water filling to the bathtub is performed by performing correction for adding the inter-sensor correction value and the cooling component correction value to the target hot water supply temperature. When performing, it can suppress that the difference of target hot-water supply temperature and the temperature of the hot water actually supplied to a bathtub becomes large.

The block diagram of the hot-water supply system of this invention. The operation | movement flowchart of the tank unit shown in FIG. The operation | movement flowchart of the tank unit shown in FIG.

  Embodiments of the present invention will be described with reference to FIGS. Referring to FIG. 1, the hot water supply system of the present embodiment is configured by instantaneous heating type water heater 10, tank unit 30, and heat pump unit 60.

  The heat pump unit 60 includes a heat pump 70 (corresponding to the heating means of the present invention) configured by connecting a compressor 71, a condenser 72, a decompressor 73, and an evaporator 74 through a refrigerant circulation path 75. . The condenser 72 is connected to a tank circulation path 64 connected to the upper and lower parts of the hot water storage tank 31, and exchanges heat between the refrigerant in the refrigerant circulation path 75 and the hot water in the tank circulation path 64, whereby the tank circulation path. The hot water in 64 is heated.

  The tank circulation path 64 includes a circulation pump 65 for circulating the hot water stored in the hot water storage tank 31 into the tank circulation path 64, and a forward thermistor for detecting the temperature of the hot water supplied from the condenser 72 to the hot water storage tank 31. 66 and a return thermistor 41 for detecting the temperature of the hot water supplied from the hot water storage tank 31 to the condenser 72 are provided.

  Then, a temperature detection signal from the forward thermistor 66 is input to the heat pump controller 80 which is an electronic unit composed of a microcomputer or the like. Further, the operation of the heat pump 70 and the circulation pump 65 is controlled by a control signal output from the heat pump controller 80.

  The heat pump controller 80 is communicably connected to the tank controller 50, and uses the hot water storage upper limit temperature and the detected temperature data of the return thermistor 41 transmitted from the tank controller 50 when receiving the hot water heating instruction signal from the tank controller 50. Based on the detected temperature of the forward thermistor 66, the detected temperature of the return thermistor 41, and the hot water storage upper limit temperature, the circulating pump 65 and the heat pump 70 are operated to heat the hot water in the hot water storage tank 31 to the hot water storage upper limit temperature.

  Next, the tank unit 30 bypasses the hot water storage tank 31, the hot water pipe 2 connected to the upper part of the hot water storage tank 31, the water supply pipe 1 connected to the lower part of the hot water storage tank 31 and the hot water supply pipe 2, and the hot water heater 10. And the hot water supply pipe 2 is provided with the hot water supply bypass pipe 37 which connects the upstream and downstream sides of the water heater 10.

  Furthermore, the tank unit 30 includes a return thermistor 41 that detects the temperature of hot water supplied from the hot water storage tank 31 to the heat pump unit 60, and a hot water storage thermistor 42 that detects the temperature of hot water stored in the hot water storage tank 31 (the hot water storage temperature of the present invention). (Corresponding to a sensor) and a hot water thermistor 33 provided in the vicinity of the upstream side of the connection point X between the tap water pipe 2 and the water supply pipe 1, and a tank water amount sensor 43 for detecting the flow rate of the water supply pipe 1 ), A water thermistor 44 provided in the water supply pipe 1, a hot water variable valve 34 for changing the flow rate of hot water supplied from the hot water storage tank 31 to the hot water discharge pipe 2, and a hot water supply from the water supply pipe 1. A variable amount of water valve 35 for changing the flow rate of water supplied to the pipe 2, a pressure reducing valve 40 with a check valve provided in the water supply pipe 1, a connection point X between the hot water pipe 2 and the water supply pipe 1, and a hot water outlet Mixing thermistor 36 (corresponding to the mixing temperature sensor of the present invention) provided between the hot water pipe 37, a bypass valve 38 for opening and closing the hot water bypass pipe 37, and a connection location of the hot water bypass pipe 37 and the hot water pipe 2 A hot water supply outlet thermistor 39 (corresponding to the hot water outlet temperature sensor of the present invention) for detecting the temperature of hot water supplied downstream of Y is provided.

  The hot water variable valve 34 and the water variable valve 35 constitute the mixing ratio changing means of the present invention.

  Then, a temperature detection signal from the hot water storage thermistor 42, the hot water thermistor 33, the hot water thermistor 44, the mixed thermistor 36, the hot water thermistor 39, and the return thermistor 41, and the tank controller 50, which is an electronic unit composed of a microcomputer or the like, A detection signal of the water flow rate of the water supply pipe 1 by the water amount sensor 43 is input. Further, the operation of the hot water variable valve 34, the water variable valve 35, and the bypass valve 38 is controlled by a control signal output from the tank controller 50.

  The tank controller 50 monitors the detected temperature of the hot water storage thermistor 42, and when the detected temperature of the hot water storage thermistor 42 is equal to or lower than the preset hot water storage lower limit temperature, the tank controller 50 gives the above-mentioned hot water storage heating instruction signal to the heat pump controller 80. Send. Thus, the hot water in the hot water storage tank 31 is heated by the heat pump unit 60 to the hot water storage upper limit temperature.

  In addition, the tank controller 50 has a desired hot water supply temperature (temperature of hot water supplied from the outlet of the hot water outlet pipe 2) and bath temperature (via a hot water pipe 18 described later) in the bathtub according to the user's operation. A temperature switch (not shown) for setting the temperature of hot water to be supplied), a general hot water supply mode (a mode in which hot water filling valve 19 to be described later is closed and hot water is supplied from the outlet of hot water outlet pipe 2), hot water A remote controller 51 (target hot water supply temperature of the present invention) provided with a mode changeover switch (not shown) for switching the tension mode (mode in which the hot water valve 19 is opened and hot water is supplied from the hot water pipe 18 to the bathtub). Including functions of setting means and mode switching means).

  Here, the hot water discharge pipe 2 is connected to the upper part of the hot water storage tank 31, and the water supply pipe 1 is connected to the lower part of the hot water storage tank 31. Therefore, when hot water is supplied from the hot water storage tank 31 to the hot water discharge pipe 2, water is supplied from the water supply pipe 1 to the lower part of the hot water storage tank 31 accordingly. In the hot water storage tank 31, a hot water layer is formed at the top and a water layer is formed at the bottom. As hot water is supplied from the hot water storage tank 31, the upper hot water layer decreases, and the detected temperature of the hot water storage thermistor 42 is set to the target hot water temperature set by the remote controller 51 (in the general hot water supply mode, set by the remote controller 51. In the hot water supply set temperature and hot water filling mode, the hot water runs out below the bath set temperature set by the remote controller 51).

  Whether the hot water storage tank 31 is in a hot water condition is determined when the detected temperature of the hot water storage thermistor 42 is equal to or lower than the hot water temperature determination temperature set near the target hot water supply temperature. What is necessary is just to judge that it is. In the present embodiment, the target hot water supply temperature is set to the hot water run-off determination temperature.

  When the detected temperature of the hot water storage thermistor 42 is higher than the target hot water supply temperature (when no hot water has run out), the tank controller 50 mixes when the tank water amount sensor 43 detects water flow exceeding a predetermined lower limit flow rate. Mixed temperature control is performed to control the opening of the hot water variable valve 34 and the water variable valve 35 so that the detected temperature of the thermistor 36 or the hot water supply outlet thermistor 39 becomes the target temperature. At this time, the tank controller 50 opens the bypass valve 38 in the general hot water supply mode, and closes the bypass valve 38 in the hot water filling mode.

  On the other hand, when the detected water temperature of the hot water storage thermistor 42 is equal to or lower than the target hot water supply temperature (a state where hot water has run out), when the tank water amount sensor 43 detects water flow exceeding the lower limit water amount, the tank controller 50 The valve 38 is closed to supply all hot water from the hot water storage tank 31 and the water supply pipe 1 to the water heater 10. In this case, in the water heater 10, heating temperature control described later is executed.

  Next, the water heater 10 bypasses the heat exchanger 11 provided in the middle of the hot water pipe 2, the burner 12 which heats the heat exchanger 11, and the heat exchanger 11, and connects the hot water pipe 2 to the heat exchanger. 11, a hot water supply bypass pipe 13 communicating between the upstream side and the downstream side, and a hot water filling pipe 18 connecting a bathtub (not shown) and the hot water supply pipe 2 on the downstream side of the connection point Z between the hot water supply pipe 2 and the hot water supply bypass pipe 13. It has.

  The hot water supply pipe 2 is supplied to a hot water heater 10 and a bypass servo 14 that changes a distribution ratio between the flow rate of hot water supplied to the heat exchanger 11 side and the flow rate of hot water supplied to the hot water supply bypass pipe 13 side. A water amount servo 15 that adjusts the flow rate of hot water, a hot water amount sensor 21 that detects the flow rate of hot water supplied to the heat exchanger 11 and the hot water supply bypass pipe 13, and downstream of the connection point Z between the hot water discharge pipe 2 and the hot water supply bypass pipe 13. A hot water heater thermistor 16 for detecting the temperature of hot water supplied to the side and a check valve 17 are provided. Further, the hot water filling pipe 18 is provided with a hot water filling amount sensor 22 for detecting the flow rate of the hot water filling pipe 18 and a hot water filling valve 19 for opening and closing the hot water filling pipe 18.

  A temperature detection signal from the water heater thermistor 16, a water flow rate detection signal from the hot water sensor 21, and a water flow rate from the hot water sensor 22 are supplied to the hot water controller 20, which is an electronic unit composed of a microcomputer or the like. The detection signal is input. Further, the operation of the bypass servo 14, the water amount servo 15, the burner 12, and the hot water filling valve 19 is controlled by a control signal output from the hot water supply controller 20.

  The hot water supply controller 20 is communicably connected to the tank controller 50 and enters a heating permission state when receiving a signal for instructing heating from the tank controller 50. When the hot water supply amount sensor 21 detects water flow exceeding a predetermined lower limit flow rate, the heating temperature control for controlling the combustion amount of the burner 12 so that the temperature detected by the water heater thermistor 16 becomes the target hot water supply temperature. Execute control. Further, when a signal for instructing heating is received from the tank controller 50, the heating is prohibited and execution of the heating temperature control is prohibited.

  Further, the hot water supply controller 20 opens the hot water filling valve 19 when the hot water filling operation for supplying a predetermined amount of hot water to a bathtub (not shown) (hot water filling mode) is performed by the hot water filling water amount sensor 22. Accumulate the amount of hot water supplied to the detected bathtub. When the cumulative amount of hot water supplied to the bathtub reaches the predetermined amount, the hot water filling valve 19 is closed to end the hot water filling operation.

  Next, the operation of the tank controller 50 will be described according to the flowcharts shown in FIGS.

  When the power of the tank unit 30 is turned on in STEP 1 of FIG. 2, the process proceeds to STEP 2 and the tank controller 50 fully closes the hot water variable valve 34 and fully opens the water variable valve 35. Then, the tank controller 50 opens the bypass valve 38 in subsequent STEP3. In STEP 4, a signal for instructing prohibition of heating is transmitted to the hot water supply controller 20, thereby prohibiting execution of the heating temperature adjustment control by the hot water heater 10.

  In the next STEP 5, the tank controller 50 waits for a water flow state in which water flow exceeding the lower limit flow rate is detected by the tank water amount sensor 43. When the water flow state is reached, the process proceeds from STEP 5 to STEP 6, and the tank controller 50 proceeds to STEP 6 to STEP 13 until the water flow state exceeding the lower limit flow rate is not detected by the tank water amount sensor 43 in STEP 14. And the loop consisting of STEP20 to STEP24 is repeatedly executed.

  In STEP 6, the tank controller 50 determines whether or not the hot water filling mode is set. When the hot water filling mode is set, the process branches to STEP 30 in FIG. 3, and when the hot water filling mode is not set (when the general hot water supply mode is set), the process proceeds to STEP 7.

  In STEP 7, the tank controller 50 determines whether or not the hot water storage thermistor 42 is in a hot water out condition where the detected temperature is equal to or lower than the target hot water supply temperature. When the hot water is out, the process branches to STEP 20, and when the hot water is not out, the process proceeds to STEP 8.

  STEP8 to STEP13 are processes when the mixed temperature control is executed in the general hot water supply mode. The tank controller 50 opens the bypass valve 38 in STEP 8 and transmits a signal instructing prohibition of heating to the hot water supply controller 20 in STEP 9. In subsequent STEP 10, correction is performed by adding an inter-sensor correction value calculated in STEP 11, which will be described later, to the hot water set temperature according to the following equation (1), and the corrected hot water set temperature is set as the mixed set temperature.

Mixed set temperature = Hot water set temperature + Inter-sensor correction value (1)
In the next STEP 11, the tank controller 50 performs feedback (FB) control of the opening amounts of the hot water variable valve 34 and the water variable valve 35 so that the detected temperature of the mixing thermistor 36 becomes the set mixing temperature. By the processing of STEP 11, the temperature of hot water supplied from the outlet 6 of the hot water discharge pipe 2 is basically controlled near the hot water supply set temperature.

  In subsequent STEP 12, the tank controller 50 further adjusts the opening amounts of the hot water variable valve 34 and the water variable valve 35 so that the detected temperature of the hot water outlet thermistor 39 becomes the hot water supply set temperature, and from the outlet 6 of the hot water discharge pipe 2. The temperature of the supplied hot water is stabilized near the hot water supply set temperature. The hot water supplied from the hot water storage tank 31 to the hot water discharge pipe 2 by the hot water variable valve 34 and the water variable valve 35 so that hot water of the hot water supply set temperature is supplied from the outlet 6 of the hot water discharge pipe 2 by the processing of STEP11 and STEP12. Mixing temperature control for adjusting the mixing ratio with water supplied from the water supply pipe 1 to the hot water pipe 2 is executed.

  In subsequent STEP 13, the tank controller 50 calculates a cooling correction value by the following equation (2).

Cooling component correction value = Detection temperature of the mixing thermistor-Detection temperature of the hot water supply outlet thermistor (2)
Here, when the bypass valve 38 is in the open state, the hot water supplied from the connecting portion X between the tap water pipe 2 and the water supply pipe 1 branches into a path on the bypass pipe 37 side and a path on the water heater 10 side. Then, the junction pipe Y joins at the bypass pipe 37 and the hot water pipe 2. And since the hot water which distribute | circulates the hot water heater 10 side is thermally radiated and cooled with the heat exchanger 11, temperature falls. Therefore, the detected temperature of the hot water supply outlet thermistor 39, which is the temperature of hot water after joining at the connecting portion Y, is lower than the detected temperature of the mixed thermistor 36, which is the temperature of hot water before branching.

  The decrease in the detected temperature of the hot water supply outlet thermistor 39 relative to the detected temperature of the mixed thermistor 36 is considered to be mainly due to the cooling of the hot water when flowing through the heat exchanger 11. Accordingly, the tank controller 50 calculates a cooling correction value as a correction value for adding the temperature decrease due to the cooling by the above equation (2). The configuration for calculating the cooling correction value in STEP 13 corresponds to the cooling correction value setting means of the present invention.

  Further, STEP 20 to STEP 24 are processes when the heating temperature control is executed in the general hot water supply mode. The tank controller 50 closes the bypass valve 38 in STEP 20, and transmits a signal instructing heating permission to the hot water supply controller 20 in STEP 21. Further, in the subsequent STEP 22, the mixture set temperature is calculated by subtracting the minimum capacity temperature from the hot water supply set temperature according to the following equation (3).

Mixing set temperature = Hot water set temperature-Minimum capacity temperature (3)
Here, the minimum capacity temperature is the rising temperature of hot water when hot water of the current amount of water (current water flow rate detected by the hot water supply amount sensor 21) is heated by the water heater 10 with the minimum capacity.

  In the next STEP 23, the tank controller 50 adjusts the opening amounts of the hot water variable valve 34 and the water variable valve 35 so that the detected temperature of the mixing thermistor 36 becomes the mixing set temperature. In this case, the combustion amount of the burner 12 is controlled on the water heater 10 side so that the detected temperature of the water heater thermistor 16 becomes the target hot water temperature (heating temperature control).

  In subsequent STEP 24, the tank controller 50 calculates the inter-sensor correction value by the following equation (4), and proceeds to STEP 14.

Sensor-to-sensor correction value = detection temperature of hot water heater thermistor-detection temperature of hot water supply outlet thermistor
····· (Four)
Here, since the heating temperature adjustment control is executed by the water heater 10, the detected temperature of the water heater thermistor 16 is close to the hot water supply set temperature. Therefore, the inter-sensor correction value is a correction value for adding the difference between the temperature detected by the water heater thermistor 16 used in the heating temperature control and the temperature of the hot water actually supplied from the hot water discharge pipe 2.

  In the present embodiment, the difference between the detected temperature of the hot water heater thermistor 16 and the detected temperature of the hot water outlet thermistor 39 is directly used as the inter-sensor correction value according to the above equation (4). In order to make the temperature of the hot water even closer to the hot water supply set temperature, the correction value between the sensors may be set by correcting the calculated value by the above equation (4).

  And the temperature difference of the temperature detected by the temperature sensor used for such temperature control and the temperature of the hot water actually supplied from the tapping pipe 2 also occurs when the mixed temperature control is executed. It is assumed.

  Therefore, in STEP 10 described above, correction is performed in advance by adding an inter-sensor correction value to the hot water supply set temperature, and the corrected hot water supply set temperature is set as the mixed set temperature. In STEP 11, the detected temperature of the mixed thermistor 36 becomes the mixed set temperature. In addition, by controlling the opening of the hot water variable valve 34 and the water variable valve 35, it can be expected that the temperature of the hot water supplied from the hot water discharge pipe 2 approaches the hot water supply set temperature.

  In STEP14, when a water stoppage state in which the water flow exceeding the lower limit flow rate is not detected by the tank water amount sensor 43, the process proceeds to STEP15, and the tank controller 50 stops the operation of the hot water amount variable valve 34 and the water amount variable valve 35. The current opening is maintained, and the process returns to STEP3.

  Next, FIG. 3 shows processing in the hot water filling mode, and in STEP 30, the tank controller 50 determines whether or not the hot water storage tank 31 is in a hot water out state. When the hot water storage tank 31 is in a hot water out condition, the process branches to STEP 40, and when not in a hot water out condition, the process proceeds to STEP 31.

  STEP 31 to STEP 34 are processes when the mixed temperature control is performed in the hot water filling mode. The tank controller 50 closes the bypass valve 38 at STEP 31. In the hot water filling mode, since the hot water filling valve 19 is opened in the water heater 10, hot water supplied from the hot water storage tank 31 to the hot water discharge pipe 2 and the hot water supply pipe 1 from the hot water supply pipe 1 when the bypass valve 38 is closed. All the water supplied to 2 is supplied to the hot water heater 10 side and is supplied to the bathtub through the hot water filling pipe 18.

  In subsequent STEP 32, the tank controller 50 transmits a signal for instructing heating inhibition to the hot water supply controller 20, whereby the water heater 10 enters a heating inhibition state. In the next STEP 33, the tank controller 50 performs correction by adding the inter-sensor correction value calculated in STEP 24 and the cooling component correction value calculated in STEP 13 to the bath set temperature by the following equation (5). The set bath set temperature is set as the mixed set temperature.

Mixed set temperature = Bath set temperature + Inter-sensor correction value + Cooling component correction value (5)
Then, in the next STEP 34, the tank controller 50 performs feedback (FB) control of the opening amounts of the hot water variable valve 34 and the water variable valve 35 so that the detected temperature of the mixing thermistor 36 becomes the mixing set temperature. Proceed to STEP14.

  The hot water supplied from the hot water storage tank 31 to the hot water pipe 2 by the hot water variable valve 34 and the water variable valve 35 so that hot water at the bath set temperature is supplied from the hot water pipe 2 to the hot water pipe 18 by the processing of STEP 34. Mixing temperature control for adjusting the mixing ratio with water supplied from the water supply pipe 1 to the hot water pipe 2 is executed.

  Next, STEP 40 to STEP 43 are processes for performing heating temperature control in the hot water filling mode. The tank controller 50 closes the bypass valve 38 in STEP 40, whereby all the hot water supplied from the hot water storage tank 31 to the hot water discharge pipe 2 and the water supplied from the water supply pipe 1 to the hot water discharge pipe 2 are supplied to the hot water heater 10 side. It is set as the state which is supplied and supplied to the bathtub via the hot water filling pipe 18.

  In subsequent STEP 41, the tank controller 50 transmits a signal for instructing heating to the hot water supply controller 20, whereby the water heater 10 is in a heating permission state. Then, in the next STEP 42, the tank controller 50 calculates the mixture set temperature by subtracting the minimum capacity temperature from the bath set temperature according to the following equation (6).

Mixing set temperature = Hot water set temperature-Minimum capacity temperature (6)
In the next STEP 43, the tank controller 50 adjusts the opening amounts of the hot water variable valve 34 and the water variable valve 35 so that the detected temperature of the mixing thermistor 36 becomes the mixing set temperature. In this case, the combustion amount of the burner 12 is controlled on the water heater 10 side so that the detected temperature of the water heater thermistor 16 becomes the target hot water temperature (heating temperature control). Then, the process proceeds to STEP 14 in FIG.

  In the present embodiment, the hot water supply system including the hot water bypass pipe 37 and the bypass valve 38 and opening the bypass valve 38 when performing the mixed temperature control in the general hot water supply mode is shown. The effect of the present invention can also be obtained when the mixture set temperature is calculated using the inter-sensor correction value without providing the above.

  In the present embodiment, the hot water supply system including the hot water filling pipe 18 and the hot water filling valve 19 and performing hot water supply in the general hot water supply mode and the hot water filling mode has been described. The present invention can also be applied when only hot water supply is performed.

  Moreover, although the hot water supply system which uses a heat pump as a heating means of the hot water in a hot water storage tank was shown in this Embodiment, you may use other heating means, such as a solar system.

  DESCRIPTION OF SYMBOLS 1 ... Water supply pipe, 2 ... Hot water supply pipe, 10 ... Hot water heater, 20 ... Hot water supply controller, 30 ... Tank unit, 31 ... Hot water storage tank, 34 ... Hot water variable valve, 35 ... Water variable valve, 36 ... Mixed temperature sensor, 37 ... Hot water bypass pipe, 38 ... Bypass valve, 42 ... Hot water storage temperature sensor, 50 ... Tank controller, 51 ... Remote control, 60 ... Heat pump unit, 70 ... Heat pump, 80 ... Heat pump controller

Claims (1)

A hot water storage tank,
A tapping pipe connected to the hot water storage tank;
A water supply pipe connected to the hot water storage tank and the hot water discharge pipe;
Heating means for heating hot water in the hot water storage tank;
A water flow sensor for detecting water flow to the water supply pipe;
A mixing ratio changing means for changing a mixing ratio between hot water supplied from the hot water storage tank to the hot water discharge pipe and water supplied from the water supply pipe to the hot water discharge pipe;
A hot water storage temperature sensor for detecting the temperature of hot water in the hot water storage tank;
A hot water heater that is provided in the middle of the hot water pipe on the downstream side of the connecting portion between the hot water pipe and the water supply pipe, and heats hot water flowing through the hot water pipe with a heat exchanger;
A hot water bypass pipe that bypasses the water heater and communicates the hot water pipe between the upstream side and the downstream side of the water heater;
A bypass valve for opening and closing the bypass pipe;
A mixed temperature sensor that is provided in the vicinity of a connection portion between the hot water pipe and the water supply pipe and detects the temperature of hot water supplied from the connection portion to the hot water discharge pipe on the downstream side;
A water heater temperature sensor that is provided in the water heater on the downstream side of the heat exchanger and detects the temperature of hot water supplied from the water heater;
Hot water temperature setting means for setting a target hot water temperature;
When water flow is detected by the water flow sensor and the detected temperature of the hot water storage temperature sensor is higher than the hot water run-off determination temperature set according to the target hot water supply temperature, the bypass valve is opened and the Heating by the water heater is prohibited, and a mixing temperature adjustment control is performed to adjust the mixing ratio by the mixing ratio changing means so that the detected temperature of the mixing temperature sensor becomes the target hot water supply temperature, and the water flow sensor When the water flow is detected and the detected temperature of the hot water storage temperature sensor is equal to or lower than the hot water exhaustion determination temperature, the bypass valve is closed and the detected temperature of the hot water heater temperature sensor is equal to the target hot water temperature. In a hot water supply system comprising a temperature control means for performing a heating temperature control for performing heating by the water heater,
A hot water outlet temperature sensor that is provided near the outlet of the hot water pipe and detects the temperature of hot water supplied from the hot water pipe;
Inter-sensor correction value setting for setting an inter-sensor correction value based on a temperature difference between a detected temperature of the hot water heater temperature sensor and a detected temperature of the hot water supply outlet temperature sensor when the heating temperature control is being executed. Means ,
A hot water filling pipe connecting the bathtub and the hot water pipe at a location between the outlet of the hot water pipe and the water heater temperature sensor;
A filling valve for opening and closing the filling pipe;
A hot water filling mode in which the hot water filling valve is opened and hot water is supplied from the hot water discharge pipe to the bathtub through the hot water filling pipe, and the hot water filling valve is closed and hot water is supplied from the outlet of the hot water discharge pipe. Mode switching means for switching between the general hot water supply mode for supplying
When the mixed temperature control is executed in the general hot water supply mode, the detected temperature of the mixed temperature sensor and the detected temperature of the hot water outlet temperature sensor when the detected temperature of the hot water outlet temperature sensor reaches the target hot water temperature. A cooling correction value setting means for setting a cooling correction value based on the temperature difference from the detected temperature;
When performing the mixed temperature adjustment control in the general hot water supply mode, the temperature adjustment control unit performs correction for adding the inter-sensor correction value to the target hot water supply temperature, and performs the mixed temperature adjustment in the hot water filling mode. When the adjustment control is executed , the hot water supply system is characterized by performing correction for adding the inter-sensor correction value and the cooling component correction value to the target hot water supply temperature .

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