JP5309061B2 - Hot water system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system leading out piping capacity from a mixer to a heating part before a user actually uses the hot water supply system even when the piping capacity of the hot water supply system is not preset. <P>SOLUTION: The hot water supply system 10 includes a mixing thermistor 27a detecting water temperature in the vicinity of an outlet of the mixer 24 and a hot water delivery thermistor 56 detecting water temperature in the vicinity of a burner heat exchanger 51. A trial operation program executed during construction is stored in a ROM of a controller 11. In the trial operation program, (1) a mixing ratio of the mixer 24 is changed; (2) a time difference between timing when the water temperature detected by the mixing thermistor 27a reaches predetermined temperature and timing when the water temperature detected by the hot water delivery thermistor 56 reaches predetermined temperature is identified; (3) a flow rate of mixed water is identified; and (4) the piping capacity from the portion in the vicinity of the outlet of the mixer 24 to the portion in the vicinity of the burner heat exchanger 51 is led out based on the time difference and flow rate. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a hot water supply system.

  The hot water supply system disclosed in Patent Document 1 includes a power generation unit, a hot water storage tank, a mixer, and a hot water heater. In this hot water supply system, the power generation unit and the hot water storage tank are connected by a circulation path, and hot water heated by the heat generated by the power generation unit is stored in the hot water storage tank. The hot water stored in the hot water tank is supplied to the mixer and mixed with tap water in the mixer to adjust the temperature.

  When the hot water supplied from the hot water tank is higher than the hot water supply set temperature, the hot water supplied from the hot water tank and tap water are mixed so that the hot water supply set temperature is reached, and the mixed hot water passes through the hot water heater. Hot water is supplied. When the hot water supplied from the hot water storage tank is lower than the hot water supply set temperature, the heating unit of the water heater is heated to supply hot water heated by the water heater. The heating amount of the water heater has a minimum heating amount and a minimum temperature rise. Therefore, when the hot water supplied from the hot water storage tank is lower than the hot water supply set temperature, mixing is performed so that the temperature of the hot water after mixing in the mixer becomes a temperature obtained by subtracting the minimum temperature rise from the hot water supply set temperature (that is, the mixer The outlet temperature of the water heater is lowered), and the heating section of the water heater starts the heating operation. As a result, hot water heated to the hot water supply set temperature is supplied from the water heater.

  In this hot water supply system, the heating operation is started at the timing when the mixed water whose temperature has been lowered by the mixer should have moved to the heating section of the hot water heater. That is, the heating operation is started at the timing when the hot water supply amount after the temperature is lowered by the mixer becomes equal to the pipe capacity from the mixer to the heating unit. Actually, since a preparation period is required from the start instruction of the heating operation until the heating is actually started, the start instruction of the heating operation is output in consideration of this preparation period. Thereby, even when the hot water stored in the hot water tank is completely consumed during hot water supply, the hot water adjusted to the hot water supply set temperature can be continuously supplied.

JP 2005-274055 A

In the conventional hot water supply system, the hot water storage tank, the mixer, and the hot water heater are integrated in advance, and the piping capacity from the mixer to the heating unit is determined in advance. Therefore, the output timing of the heating operation start command can be determined based on the known pipe capacity. However, when connecting the mixer and the water heater at the construction site, it is necessary to derive the piping capacity from the mixer to the heating unit.
In Patent Document 1, when hot water is supplied using hot water in a hot water tank, it is necessary for the water temperature at the outlet of the heating unit to reach this approximate value after the water temperature at the mixer outlet reaches the approximate value of the hot water supply set temperature. The technique which calculates | requires the piping capacity | capacitance from a mixer exit to the exit of a heating part based on the said period and the flow volume of water is disclosed. In this method, since the pipe capacity cannot be grasped unless the user actually uses it, the start time of the heating operation cannot be determined using the pipe capacity until then. .

  The present invention has been made in view of such circumstances, and its purpose is to mix before the user actually uses the hot water system, even if the piping capacity of the hot water system is not set in advance. It is providing the hot-water supply system which can derive | lead-out the piping capacity | capacitance from a heater to a heating part.

The hot water supply system of the present invention includes a hot water storage tank, a mixer, and a heating unit. The mixer mixes the water stored in the hot water tank and the tap water. The heating unit heats the mixed water flowing out of the mixer. The hot water supply system further includes first detection means for detecting the water temperature near the outlet of the mixer, second detection means for detecting the water temperature near the heating unit, storage means for storing a trial run program, and trial run. And a control means for executing the program.
The commissioning program is
(1) Change the mixing ratio of the mixer,
(2) specifying a time difference between a time when the water temperature detected by the first detection means reaches a predetermined temperature and a time when the water temperature detected by the second detection means reaches the predetermined temperature;
(3) Specify the mixed water flow rate,
(4) The process includes deriving the pipe capacity from the vicinity of the outlet of the mixer to the vicinity of the heating unit from the time difference specified in (2) and the flow rate specified in (4).
The heating unit may be included in the water heater or may be designed exclusively. The vicinity of the heating unit may be the vicinity of the inlet of the heating unit, the intermediate position of the heating unit, or the vicinity of the outlet. The temperature detecting means can be installed at an intermediate position of the heating unit by taking a heat resistance measure. The mixed water refers to water flowing out of the mixer, which may be hot water or cold water, and the total amount of water may be stored water and tap water may not be mixed.

According to the said structure, the pipe capacity from the exit vicinity of a mixer to the vicinity of a heating part is derived | led-out in the case of trial operation. Even when the pipe capacity is not set in advance, the pipe capacity from the vicinity of the outlet of the mixer to the vicinity of the heating unit can be derived before the user uses the hot water supply system. Therefore, when the user uses the hot water supply system, the start timing of the heating operation of the heating unit can be determined based on the pipe capacity already derived.
In particular, when a hot water supply system is constructed by connecting a mixer and a water heater at a construction site, it is difficult to grasp the piping capacity from the vicinity of the outlet of the mixer to the vicinity of the heating unit. Therefore, it is effective to derive the pipe capacity by the above configuration.

In the hot water supply system of the present invention, the trial run program derives the pipe capacity based on the above time difference when the water temperature detected by the first detection means and the second detection means rises, and the derived temperature rise time The process of storing the pipe capacity is included, and the control program during hot water supply operation reads the stored pipe temperature at the time of temperature rise, and heats the heating unit based on the read out pipe temperature at the time of temperature rise. Includes processing to determine when to stop.
When the temperature of the mixed water flowing out from the mixer is lower than the hot water supply set temperature, the mixed water flowing out from the mixer is heated and supplied with hot water when flowing through the heating unit. When the temperature of the mixed water flowing out of the mixer rises and reaches the hot water supply set temperature, it is not necessary to heat the mixed water when hot water is supplied, and thus heating of the heating unit is stopped. In the above configuration, since the pipe capacity is derived when the water temperature detected by each detection means rises, the pipe capacity can be derived in a situation similar to the situation where the heating unit during operation is stopped. Therefore, the heating stop timing of the heating unit can be determined more appropriately by determining the heating stop timing using this pipe capacity.

And / or in the hot water supply system of the present invention, the test run program is derived from the process of deriving the pipe capacity based on the time difference when the water temperature detected by the first detection means and the second detection means falls. It includes a process for storing the pipe capacity at the time of cooling, and the control program at the time of operation using hot water supplies reads the pipe capacity at the time of cooling and stores the heating section based on the read pipe capacity at the time of cooling. Includes the process of determining the start time.
When the temperature of the mixed water flowing out from the mixer is higher than the hot water supply set temperature, the mixed water flowing out from the mixer is heated as it is without being heated by the heating unit. When the temperature of the mixed water flowing out of the mixer decreases and becomes lower than the hot water supply set temperature, it is necessary to heat the mixed water during hot water supply, and thus heating of the heating unit is started. In the above configuration, since the pipe capacity is derived when the temperature of the mixed water flowing out from the mixer is lowered, the pipe capacity can be derived in a situation similar to the situation in which heating in the heating unit is started. Therefore, by determining the heating start time using this pipe capacity, the heating start time of the heating unit can be more appropriately determined.

In the hot water supply system trial run program, the mixing ratio of the mixer is repeated between a cold water mode in which the ratio of stored water: tap water is 0: 1 and a hot water mode in which the temperature of the mixed water is equal to the hot water supply set temperature. It is preferable to switch.
In the above configuration, the water temperature detected by each detecting means can be changed greatly. Therefore, since the time when the water temperature detected by each detection means reaches a predetermined temperature can be specified more accurately, the time difference when the water temperature detected by each detection means reaches the predetermined temperature can be specified more accurately. be able to. As a result, the pipe capacity can be derived more accurately.

By switching from the cold water mode to the hot water mode, the pipe capacity may be derived based on the above time difference when the water temperature detected by each detection means rises. Alternatively, by switching from the hot water mode to the cold water mode, the pipe capacity may be derived based on the above time difference when the water temperature detected by each detecting means is lowered. The pipe capacity may be derived under both conditions, and the two types of derived pipe capacity may be selected according to the control situation. Or you may derive | lead-out piping capacity | capacitance using the average value of the time difference at the time of water temperature rise, and the time difference at the time of water temperature fall.

When the hot water mode and the cold water mode are alternately repeated in the trial operation program, it is preferable that the predetermined temperature is set between the tap water temperature and the hot water supply set temperature.
In the above configuration, the water temperature detected by each detection means reaches a predetermined temperature in a transient period in which the temperature rises from the tap water temperature to the hot water supply set temperature, or in a transient period in which the water temperature drops from the hot water supply set temperature to the tap water temperature. Since the water temperature change per unit time is large during the transition period, the time when the water temperature detected by each detection means reaches a predetermined temperature can be specified more accurately. Therefore, the time difference of the time when the water temperature detected by each detection means reaches a predetermined temperature can be specified more accurately. Therefore, the pipe capacity can be derived more accurately.

Switching from the cold water mode to the hot water mode on the condition that the water temperature detected by the second detection means is stable, and switching from the hot water mode to the cold water mode on the condition that the water temperature detected by the second detection means is stabilized again. It is preferable.
In the above configuration, since the mode is switched after the water temperature detected by the second detection unit is stabilized, the period required for the water temperature detected by the first detection unit and the second detection unit to reach a predetermined temperature is stabilized. To do. Therefore, it is possible to more accurately specify the time difference between the times when the water temperature detected by each detection means reaches the predetermined temperature.

In the trial operation program, it is preferable to set the flow rate of the mixed water to the shower flow rate.
When using a shower, it is particularly strongly required that the hot water supply temperature is stable. In the above-described configuration, the pipe capacity can be derived by passing water at the same flow rate as when using a shower where stability of the hot water supply temperature is particularly required. If the heating start timing and stop timing of the heating unit are determined based on the pipe capacity derived from the flow rate at the time of shower use, the hot water temperature at the time of shower use where stability of the hot water temperature is particularly required can be stabilized. .

  According to the hot water supply system of the present invention, even if the pipe capacity of the hot water supply system is not preset, the pipe capacity from the mixer to the heating unit is derived before the user actually uses the hot water supply system. can do. This is particularly effective when a hot water supply system is constructed by connecting a mixer and a hot water heater at a construction site.

1 is a system diagram of a hot water supply system according to Embodiment 1. FIG. 3 is a flowchart showing an execution procedure of a test run program according to the first embodiment. 3 is a flowchart showing an execution procedure for setting initial conditions of the trial run program according to the first embodiment. The flowchart which shows the execution procedure of the warm water mode of the trial run program of Example 1. FIG. The flowchart which shows the execution procedure of the cold water mode of the trial run program of Example 1. FIG. 4 is a timing chart showing detected water temperatures of the mixing thermistor and the tapping thermistor according to the first embodiment. 9 is a flowchart showing an execution procedure of a test run program according to the second embodiment.

The technical features of the embodiments described below are listed.
(Feature 1) In the hot water supply system, each of the switching from the hot water mode to the cold water mode and the switching from the cold water mode to the hot water mode are performed a plurality of times, and at the time of switching from the hot water mode to the cold water mode that is performed a plurality of times. The pipe capacity at the time of temperature reduction is derived, and the pipe capacity at the time of temperature rise is derived at the time of switching from the cold water mode to the hot water mode that is executed a plurality of times.
(Feature 2) In the hot water supply system, switching between the hot water mode and the cold water mode is executed a plurality of times, and the hot water supply set temperature Th in the hot water mode executed a plurality of times is set to a plurality of temperatures.
(Characteristic 3) The hot water supply system includes a switch for executing a test operation and display means for indicating that the test operation is being executed.

  A first embodiment embodying a hot water supply system of the present invention will be described with reference to FIGS. FIG. 1 is a system diagram of a hot water supply system 10, and the flow of water and heat medium is indicated by arrows. As shown in FIG. 1, the hot water supply system 10 includes a hot water storage unit 20, a heat pump unit 40, a hot water supply unit 50, and a controller 11. This hot water supply system 10 is constructed by connecting separate units 20, 50, and 40 at the time of construction.

  In the heat pump unit 40, the discharge side of the compressor 41, the four-way valve 42, the heat medium flow path 43a of the first heat exchanger 43, the expansion valve 44, the second heat exchanger 45, and the return side of the compressor 41 are the heat medium pipes. The heating medium circulates in this order. The first heat exchanger 43 includes the heat medium passage 43a and the circulating water passage 43b. A fan 45 a is installed in the vicinity of the second heat exchanger 45. The second heat exchanger 45 exchanges heat with the outside air sent by the fan 45a. A defrosting path 47 is connected to the heat medium pipe 46 between the discharge side of the compressor 41 and the four-way valve 42 and between the expansion valve 44 and the second heat exchanger 45. In the defrosting path 47, a defrosting valve 47a is provided. A circulation forward path connection path 48 is connected to the inlet side of the circulating water flow path 43b of the first heat exchanger 43, and a circulation return path connection path 49 is connected to the outlet side. The circulation path connection path 48 is provided with an inlet side thermistor 48a, and the circulation path connection path 49 is provided with an outlet side thermistor 49a. The inlet side thermistor 48a detects the temperature of the circulating water flowing into the circulating water flow path 43b, and the outlet side thermistor 49a detects the temperature of the circulating water flowing out of the circulating water flow path 43b. Actually, each thermistor 48a, 49a outputs a detection signal corresponding to the water temperature, and this signal is input to the controller 11 to detect the water temperature. In the following description, the expression that a thermistor or sensor detects actually means that the temperature or the flow rate of water is detected by inputting these detection signals to the controller 11.

  The hot water storage unit 20 includes a hot water storage tank 21 and a mixer 24. A water supply path 22 for supplying tap water to the hot water tank 21 is connected to the bottom of the hot water tank 21. In the vicinity of the tap water inlet 22 a of the water supply path 22, a pressure reducing valve 23 is provided. A mixed water supply path 26 of the mixer 24 is connected to the water supply path 22 on the downstream side of the pressure reducing valve 23. The mixed water supply path 26 is provided with a water supply control valve 26a. The pressure reducing valve 23 adjusts the water supply pressure to the hot water storage tank 21 and the mixer 24. When the hot water in the hot water storage tank 21 decreases or the water supply control valve 26a opens, the downstream pressure of the pressure reducing valve 23 decreases. The pressure reducing valve 23 opens when the downstream pressure decreases, and tries to maintain the pressure at a predetermined pressure regulation value. For this reason, when the hot water in the hot water storage tank 21 decreases or the water supply control valve 26a of the mixer 24 is opened, tap water is supplied thereto.

  In the water supply path 22, a drainage path 31 is connected to the downstream side of the connection portion of the mixed water supply path 26. A drain valve 32 is provided in the middle of the drain path 31. The drain valve 32 can be manually opened and closed. When the drain valve 32 is opened, the water in the hot water tank 21 is drained to the outside through the drain path 31.

  One end of a circulation outward path 33 is connected to the bottom of the hot water tank 21, and one end of a circulation return path 34 is connected to the upper part of the hot water tank 21. The other end of the circulation outward path 33 is connected to the circulation outward path connection path 48 of the heat pump unit 40, and the other end of the circulation return path 34 is connected to the circulation return path connection path 49. A circulation thermistor 36 and a circulation pump 37 are provided in the circulation outward path 33. The outward thermistor 36 detects the temperature of the water that has flowed out of the hot water storage tank 21 into the circulation outward path 33. When the circulation pump 37 is driven, water is sucked out from the lower part of the hot water tank 21 to the circulation forward path 33, and this water flows through the circulating water flow path 43 b and is returned to the upper part of the hot water tank 21 through the circulation return path 34. In this way, a circulation path between the hot water tank 21 and the heat pump unit 40 is configured. A pressure release path 38 is connected in the middle of the circulation return path 34, and a relief valve 38 a is provided in the pressure release path 38. The valve opening pressure of the relief valve 38 a is set slightly higher than the pressure regulation value of the pressure reducing valve 23. When the pressure regulation of the pressure reducing valve 23 becomes impossible, the relief valve 38a is opened to prevent the pressure in the hot water storage tank 21 from exceeding the pressure that can withstand pressure. In the hot water storage tank 21, an upper thermistor 39 is attached to a predetermined amount (for example, 30 liters) from the upper end. The upper thermistor 39 detects the water temperature at the upper part of the hot water tank 21.

  The mixer 24 includes a warm water control valve 25a, a warm water flow rate sensor 25b, a warm water thermistor 25c, a feed water flow rate sensor 26b, a feed water thermistor 26c, a mixed thermistor (first detection means) 27a, and the above-described feed water control valve 26a. A hot water path 25 of the mixer 24 is connected to the upper part of the hot water tank 21. The warm water path 25 is provided with a warm water control valve 25a, a warm water flow rate sensor 25b, and a warm water thermistor 25c. The hot water control valve 25 a adjusts the flow rate of water flowing from the hot water tank 21 to the hot water path 25. The warm water flow sensor 25b and the warm water thermistor 25c detect the flow rate and temperature of the water flowing through the warm water path 25. The mixed water supply path 26 is provided with the above-described water supply control valve 26a, a water supply flow rate sensor 26b, and a water supply thermistor 26c. The water supply control valve 26 a adjusts the flow rate of tap water flowing through the mixed water supply path 26. The water supply flow rate sensor 26 b and the water supply thermistor 26 c detect the flow rate and temperature of tap water flowing through the mixed water supply path 26. The warm water path 25 and the mixed water supply path 26 merge and are connected to the first mixing path 27. The first mixing path 27 is provided with a mixing thermistor 27 a that detects the temperature of the mixed water flowing through the first mixing path 27.

  The hot water storage unit 20 includes a first hot water supply path 29. A hot water supply thermistor 29 a is provided in the first hot water supply path 29. A hot-water tap 60 is connected to the tip of the first hot water supply path 29. The hot-water tap 60 is arranged in a bathroom, a washroom, a kitchen, etc. (in FIG. 1, the plurality of hot-water taps 60 are represented by one). The middle of the first mixing path 27 and the middle of the first hot water supply path 29 are connected by a hot water supply bypass path 28. The hot water supply bypass path 28 is provided with a bypass control valve 28a. When the bypass control valve 28a is opened, the mixed water flowing through the first mixing path 27 flows to the hot water supply bypass path 28, and when the bypass control valve 28a is closed, the mixed water flowing through the first mixing path 27 is It flows to the second mixing path 51 of the hot water supply unit 50 described later.

  The hot water supply unit 50 includes a burner heat exchanger (heating unit) 52, a burner 53, and the like. The inlet side of the burner heat exchanger 52 is connected to the first mixing path 27 of the hot water storage unit 20 via the second mixing path 51. The mixed water flows into the burner heat exchanger 52 through the second mixing path 51. In the second mixing path 51, an incoming thermistor 51a, a hot water supply amount sensor 51b, and a water amount servo 51c are provided. The incoming water thermistor 51a and the hot water supply amount sensor 51b detect the temperature and flow rate of the water flowing through the second mixing path 51, respectively. The water amount servo 51 c adjusts the flow rate of water flowing through the second mixing path 51. The gas combustion type burner 53 heats the burner heat exchanger 52. The outlet side of the burner heat exchanger 52 is connected to the first hot water supply path 29 via the second hot water supply path 54. Hot water that has flowed through the burner heat exchanger 52 is supplied from the hot water tap 60 through the second hot water supply path 54 and the first hot water supply path 29. In the second hot water supply path 54, a can body thermistor 55 is provided in the vicinity of the outlet of the burner heat exchanger 52, and a hot water thermistor (second detection means) 56 is provided downstream thereof.

  A heat source bypass path 57 is connected between the downstream side of the water amount servo 51 c in the second mixing path 51 and the can body thermistor 55 and the hot water thermistor 56 in the second hot water supply path 54. A heat source unit bypass control valve 58 is provided at a connection portion between the second mixing path 51 and the heat source unit bypass path 57. By adjusting the opening degree of the heat source unit bypass control valve 58, a part of the water flowing through the second mixing path 51 flows into the heat source unit bypass path 57.

  The controller 11 includes a CPU, a ROM, a RAM, and the like. A ROM (storage means) stores a trial operation program and a utilization operation program. The RAM temporarily stores various signals input to the controller 11 and various data generated in the course of execution of processing by the CPU. More specifically, the detection signals of the various thermistors 25c, 26c, 27a, 29a, 36, 39, 48a, 49a, 51a, 55, 56 and the water amount sensors 25b, 26b, 51b are input to the RAM. Is temporarily stored. In the controller 11, a CPU (control means) outputs drive signals to various control valves of the hot water storage unit 20 and the hot water supply unit 50 and various devices of the heat pump unit 40 based on information stored in the ROM and RAM. Further, the remote controller 13 is provided with switches and buttons for operating the hot water supply system 10, a liquid crystal display for displaying the operation state of the hot water supply system 10, and the information set by the remote controller 13 is input to the controller 11. Is done. The controller 11 controls the hot water supply system 10 to perform a trial operation and a hot water supply utilization operation. In the hot water supply system 10, a trial operation is performed at the time of construction, and a hot water supply use operation is performed thereafter. Here, the hot water supply use operation will be described first.

(Operations during hot water supply operation)
The controller 11 controls a use operation for supplying hot water to a user of the hot water supply system 10.
In the hot water use operation program,
(1) The water in the hot water tank 21 is heated by the heat pump unit 40 to be hot hot water, and the hot water is stored in the hot water tank 21;
(2) Mixing the water stored in the hot water tank 21 (hot water in this case) and tap water in the mixer 24 and adjusting the mixed water to the hot water supply set temperature Th;
(3) A first hot water supply operation in which the mixed water adjusted to the hot water supply set temperature Th by the mixer 24 is supplied from the hot water tap 60 through the hot water supply bypass path 28, and the mixer 24 is adjusted to a temperature lower than the hot water supply set temperature Th. When the mixed water passes through the burner heat exchanger 52 of the hot water supply unit 50, the second hot water supply operation is performed in which the mixed water is heated and supplied from the hot water tap 60.

First, hot water is stored in the hot water storage tank 21 by operating the heat pump unit 40. In the heat pump unit 40, the heat medium compressed by the compressor 41 heats the circulating water flowing through the circulating water flow path 43 b when flowing through the heat medium flow path 43 a of the first heat exchanger 43. The heat medium flowing out from the circulating water flow path 43b is expanded and cooled by the expansion valve 44, and is heated by absorbing heat from the outside air when flowing through the second heat exchanger 45. The heat medium heated by the outside air flows into the compressor 41 and is compressed again.
In the heat pump unit 40, as indicated by the broken line arrow, the defrosting of the second heat exchanger 45 is performed, so that the high-temperature heat medium that is temporarily opened from the defrost valve 47a and discharged from the compressor 41 is defrosted. The second heat exchanger 45 is caused to flow through the path 47.

  In the hot water storage unit 20, the circulation pump 37 is operated, and the water in the hot water storage tank 21 is sucked out from the bottom of the hot water storage tank 21 to the circulation forward path 33. The water sucked into the circulation forward path 33 is heated and increases in temperature when passing through the circulation water flow path 43b of the first heat exchanger 43 of the heat pump unit 40. The hot water whose temperature has risen flows through the circulation return path 34 and is returned to the upper part of the hot water tank 21. By this circulation, the hot water storage tank 21 forms a temperature stratification in which a high-temperature layer is laminated on the cold water layer. When hot hot water continues to be returned to the hot water storage tank 21, the thickness (depth) of the high temperature layer gradually increases, and when the hot water is fully stored, the hot water hot water is stored in the entire hot water storage tank 21. . Even if the hot water storage tank 21 is not fully stored, by forming a temperature stratification, hot hot water is sent out to the hot water path 25 connected to the upper part of the hot water storage tank 21.

  The first hot water supply operation and the second hot water supply operation are performed as follows. When the detected water temperature of the upper thermistor 39 of the hot water storage tank 21 is equal to or higher than the reference temperature higher than the hot water supply set temperature Th, the first hot water supply operation is performed. In the first hot water supply operation, the controller 11 opens the bypass control valve 28a. The controller 11 adjusts the opening degree of the hot water control valve 25a and the opening degree of the water supply control valve 26a so that the water temperature detected by the mixing thermistor 27a becomes the hot water supply set temperature Th. The mixed water adjusted to the hot water supply set temperature Th flows through the first mixing path 27, and then hot water is supplied from the hot water tap 60 through the hot water supply bypass path 28 and the first hot water supply path 29.

  On the other hand, when the detected water temperature of the upper thermistor 39 is lower than the reference temperature, the second hot water supply operation is performed. In the second hot water supply operation, the controller 11 fully closes the bypass control valve 28a and sets the water amount servo 51c to a predetermined opening. The controller 11 adjusts the opening degree of the hot water control valve 25a and the opening degree of the water supply control valve 26a so that the water temperature detected by the mixed thermistor 27a is lower than the hot water supply set temperature Th. The mixed water adjusted to a temperature lower than the hot water supply set temperature flows through the first mixing path 27, flows through the second mixing path 51 of the hot water supply unit 50, flows into the burner heat exchanger 52, and is heated by the burner 53. . The burner heat exchanger 52 is controlled so that the water temperature detected by the can body thermistor 55 provided at the outlet of the burner heat exchanger 52 is 60 ° C. or higher. Thereby, it can suppress that dew condensation water generate | occur | produces in piping. When the hot water supply set temperature Th is lower than 60 ° C., the opening degree of the heat source unit bypass control valve 58 is controlled so that the water temperature detected by the tapping hot water thermistor 56 becomes the hot water supply set temperature Th. As a result, a part of the mixed water flowing through the second mixing path 51 flows into the second hot water supply path 54 through the heat source unit bypass path 57 and the hot water of 60 ° C. or higher flowing through the burner heat exchanger 52 and the burner heat exchanger. The water is mixed with the low-temperature water not flowing through the hot water 52 to obtain hot water having a hot water supply set temperature Th. In this way, the hot water adjusted to the hot water supply set temperature Th is supplied from the hot water tap 60 through the second hot water supply path 54 and the first hot water supply path 29. Thereby, even when the hot water stored in the hot water storage tank 21 is completely consumed during the first hot water supply operation, the hot water adjusted to the hot water supply set temperature Th can be continuously supplied.

  When switching between the first hot water supply operation and the second hot water supply operation, the controller 11 controls the burner 53 as follows. When switching from the first hot water supply operation to the second hot water supply operation is performed, the controller 11 outputs an ignition command to the burner 53 in a fire extinguisher state. The controller 11 ignites the burner 53 at the timing when the mixed water having a temperature lower than the hot water supply set temperature Th moves to the burner heat exchanger 52. That is, the burner 53 is ignited at a timing when the amount of hot water flowing after the temperature is lowered by the mixer 24 becomes equal to the pipe capacity from the mixer 24 to the burner heat exchanger 52. In this embodiment, the piping capacity from the mixing thermistor 27 a to the hot water thermistor 56 is used as the piping capacity from the mixer 24 to the burner heat exchanger 52. Specifically, the ignition timing of the burner 53 is determined by using a temperature drop piping capacity Vw described later. Actually, since the pre-purge operation is performed from the ignition command of the burner 53 until the ignition is started, the controller 11 outputs the ignition command to the burner 53 in consideration of the period required for the pre-purge operation.

  On the other hand, when switching from the second hot water supply operation to the first hot water supply operation is performed, the controller 11 extinguishes the burner 53 in an ignited state. The controller 11 extinguishes the burner 53 at the timing when the mixed water at the hot water supply set temperature Th moves to the burner heat exchanger 52. That is, the burner is heated at the timing when the amount of hot water flowing after the temperature of the mixed water mixed by the mixer 24 is raised to the hot water set temperature Th becomes equal to the pipe capacity from the mixer 24 to the burner heat exchanger 52. 53 is extinguished (heating operation is stopped). Specifically, the fire extinguishing timing of the burner 53 is determined by using a pipe capacity Vh at the time of temperature increase described later. The burner 53 extinguishes fire when the fire extinguishing command is output from the controller 11.

(Operation during trial operation)
As described above, in the hot water supply system 10 of the present embodiment, the ignition timing of the burner 53 and the burner 53 are changed based on the piping capacity from the mixed thermistor 27a to the hot water thermistor 56 when switching between the first hot water supply operation and the second hot water supply operation. The fire extinguishing time is decided. However, since the hot water supply system 10 of the present embodiment is constructed by connecting the separate hot water storage unit 20 and the hot water supply unit 50, the piping capacity from the mixed thermistor 27a to the hot water thermistor 56 is not set in advance. Therefore, in this embodiment, the pipe capacity is derived by executing a trial operation program during construction of the hot water supply system 10. The trial run program is performed in a state where the hot-water tap 60 is opened as in the case of actual hot water use.

The commissioning program is
(1) changing the mixing ratio of the mixer 24;
(2) specifying a time difference between a time when the water temperature detected by the mixed thermistor 27a reaches a predetermined temperature and a time when the water temperature detected by the tapping thermistor 56 reaches the predetermined temperature;
(3) specify the flow rate of water after changing the mixing ratio of the mixer 24;
(4) This is a process for deriving the pipe capacity from the vicinity of the outlet of the mixer 24 to the vicinity of the burner heat exchanger 52 from the time difference specified in (2) and the flow rate specified in (3).
2-5 is a flowchart which shows the execution procedure of a trial run program. The controller 11 performs a trial operation of the hot water supply system 10 according to the flowcharts shown in FIGS. FIG. 6 is a timing chart showing the detected water temperature (solid line A) of the mixed thermistor 27a and the detected water temperature (dashed line B) of the hot water thermistor 56 during execution of the trial run program.

  As shown in FIG. 2, when the trial run program is started, it is first determined in step S1 whether or not a trial run start condition is satisfied. One of the test operation start conditions is that the detected water temperature of the upper thermistor 39 of the hot water tank 21 is equal to or higher than a reference temperature higher than the hot water supply set temperature Th. Hot water is stored in the hot water storage tank 21 by operating the heat pump unit 40 in the same manner as in the use operation. Another condition for starting the trial operation is that the trial operation switch 16 is in the ON state. As shown in FIG. 1, the test run switch 16 is provided in the controller 11, and the installer turns on the test run switch 16 when the hot water supply system 10 is completed at the enforcement site or after maintenance. The controller 11 is provided with a display screen 17 and displays that the trial run program is being executed. The test run switch 16 is used only by a construction contractor during construction or maintenance. Since the test run button 16 is not provided on the remote controller 13, it is possible to prevent the user from pressing the test run switch 16 when using hot water. The determination in step S1 is repeatedly performed until these trial operation start conditions are satisfied.

  If it is determined that the test operation start condition is satisfied, the process proceeds to step S2. In step S2, initial conditions for trial operation are set. As shown in FIG. 6, before the trial run program is executed (before time t1 in FIG. 6), the temperature of the piping is affected by the ambient temperature, and the detected temperature of the mixed thermistor 27a (A in FIG. 6) and the hot water The detected temperature (B in FIG. 6) of the thermistor 56 may be different. Therefore, in the initial condition setting, the tap water is circulated from the first mixing path 27 to the second hot water supply path 54, whereby the initial temperature of the pipe (the detected temperature of the mixed thermistor 27a and the hot water thermistor 56) is set to the tap water. It is made to correspond to temperature Tw. As a result, even if the pipe temperature varies before the trial run program is executed, the pipe temperature can be matched with the tap water temperature Tw, and the initial conditions can be made uniform.

  Specifically, the initial condition setting is executed according to the flowchart shown in FIG. As shown in FIG. 3, when the setting of initial conditions starts, the process proceeds to step S21, the hot water control valve 25a is set to a fully closed state, the water supply control valve 26a is set to a fully open state, and the bypass control valve 28a is fully closed. Set to state. Accordingly, in the mixer 24 of FIG. 1, the water stored in the hot water storage tank 21 and tap water are mixed at a mixing ratio of 0: 1, and the mixed water adjusted by the mixer 24 becomes tap water. Further, since the bypass control valve 28a is set in a fully closed state, the mixed water (tap water) that has flowed through the first mixing path 27 flows through the second mixing path 51 and passes through the burner heat exchanger 52. It flows out from the hot water tap 60.

  In step S22, the flow rate of the mixed water is adjusted to the shower flow rate by the water amount servo 51c. The shower flow rate is approximately 8 to 12 liters / min. In this embodiment, the water amount servo 51c is adjusted so that the flow rate of hot water detected by the hot water supply amount sensor 51b is 12 liters / min. Further, during the execution of the trial run program, the water amount servo 51c is adjusted so that the flow rate of the mixed water is maintained at 12 liters / min. This is due to the following reason. When using a shower, it is particularly strongly required that the hot water supply temperature is stable. Therefore, in the trial run program, water having the same flow rate as in the shower use where stability of the hot water supply is particularly required is passed, and the ignition timing and extinguishing timing of the burner 53 are determined based on the pipe capacity derived under this condition. This is because the hot water supply temperature can be stabilized at the time of shower use, where stability of the hot water supply is particularly required. Next, the process proceeds to step S23, where it is detected whether or not the difference in water temperature detected by the hot water thermistor 56 and the water supply thermistor 26c is 1 ° C. or less. That is, in step S23, it is determined whether or not the tap water has flowed to the attachment position of the hot water thermistor 56 and the variation in piping temperature has been eliminated. When an affirmative determination is made in step S23, the process proceeds to the end, and the process proceeds to step S3 of the test run program of FIG.

  In step S3, the warm water mode is executed. The warm water mode is executed according to the flowchart shown in FIG. 4 in detail. When the hot water mode starts, first, the process proceeds to step S31, and the mixing ratio of the mixer 24 is controlled so that hot water supply at the hot water supply set temperature Th is performed. Specifically, the opening degrees of the hot water control valve 25a and the water supply control valve 26a are adjusted so that the water temperature detected by the mixed thermistor 27a becomes the hot water supply set temperature Th. In this embodiment, a general hot water supply set temperature 42 ° C. is set in advance as the hot water supply set temperature Th. As shown in FIG. 6, when the hot water mode is started at time t <b> 2, the hot water flows from the first mixing path 27 to the second hot water supply path 54, thereby detecting the detected water temperature (A) of the mixed thermistor 27 a and the hot water thermistor 56. The detected water temperature (B) gradually increases.

  Next, the process proceeds to step S32, where it is determined whether or not the water temperature detected by the mixing thermistor 27a is equal to or higher than the first predetermined temperature T1. The first predetermined temperature T1 is set to a temperature 5 ° C. lower than the hot water supply set temperature Th, that is, 37 ° C. The determination in step S32 is repeated until the water temperature detected by the mixing thermistor 27a becomes equal to or higher than the first predetermined temperature T1. As shown in FIG. 6, when the water temperature (A) detected by the mixed thermistor 27a reaches the first predetermined temperature T1 at the time th1, the water temperature detected by the mixed thermistor 27a becomes the first temperature in step S32 of FIG. It is determined that the temperature is equal to or higher than the predetermined temperature T1. By this determination, the process proceeds to step S33, and this time th1 is stored as the hot water first time th1.

  Next, the process proceeds to step S34, where it is determined whether or not the water temperature detected by the hot water thermistor 56 has become equal to or higher than the first predetermined temperature T1. The determination in step S34 is repeatedly performed until the water temperature detected by the hot water thermistor 56 becomes equal to or higher than the first predetermined temperature T1. As shown in FIG. 6, when the water temperature (B) detected by the tapping thermistor 56 reaches the first predetermined temperature T1 at the time th2, the water temperature detected by the tapping thermistor 56 is set to the first predetermined temperature in step S34 of FIG. It is determined that the temperature is equal to or higher than T1. By this determination, the process proceeds to step S35, and this time th2 is stored as the hot water second time th2. Thereafter, the process proceeds to step S36, and a time difference Δ (th2-th1) between the hot water first time th1 and the hot water second time th2 is calculated.

  In the hot water mode, hot water having a hot water supply set temperature Th is allowed to flow from the first mixing path 27 to the second hot water supply path 54. In steps S32 and S34, the water temperature detected by the mixed thermistor 27a and the hot water thermistor 56 is determined. Instead of determining whether or not the set temperature Th has been reached, it is determined whether or not the first predetermined temperature T1 is 5 ° C. lower than the hot water supply set temperature Th. Accordingly, as shown in FIG. 6, the water temperature detected by the mixed thermistor 27a and the hot water thermistor 56 changes from the tap water temperature Tw to the hot water supply set temperature Th (as shown in graphs A and B, per unit time). Since the first predetermined temperature T1 is reached when the change rate of the water temperature is large), the time when the water temperature detected by the mixing thermistor 27a and the hot water thermistor 56 reaches the first predetermined temperature T1 can be specified more accurately. Therefore, the time difference Δ (th2-th1) between the warm water first time th1 and the warm water second time th2 can also be specified more accurately.

  After the time difference Δ (th2−th1) is specified, the process proceeds to step S37, and the temperature increase pipe capacity Vh is derived. The pipe temperature Vh at the time of temperature rise is derived by multiplying the hot water time difference Δ (th2−th1) by the mixed water flow rate (shower flow rate in this embodiment). The pipe capacity from the mixing thermistor 27a to the tapping thermistor 56 is a constant capacity regardless of whether the temperature of the water flowing through the pipe from the mixing thermistor 27a to the tapping thermistor 56 increases or decreases. However, the amount of heat radiation flowing through the pipe may be different between when the water temperature rises and when it falls, and these factors may affect the derivation of the pipe capacity. Therefore, in this embodiment, the pipe capacity Vh at the time of temperature rise and the pipe capacity Vw at the time of temperature drop described later are derived individually.

  The temperature increase pipe capacity Vh derived in the hot water mode determines the fire extinguishing timing of the burner 53 when the second hot water supply operation is changed to the first hot water supply operation during the use operation of the hot water supply system 10 described above. Used for. That is, in the second hot water supply operation, the temperature of the water flowing out from the mixer 24 is lower than the hot water supply set temperature Th, and the water flowing out from the mixer 24 is heated when flowing through the burner heat exchanger 52. When the detected water temperature of the upper thermistor 39 of the hot water tank 21 rises and becomes higher than the reference temperature higher than the hot water supply set temperature Th, the temperature of the water flowing out of the mixer 24 rises to reach the hot water set temperature Th, and the burner 53 Fire extinguishes and switches to the first hot water supply operation. By switching from the initial condition setting of the test operation program to the hot water mode, the water flowing through the first mixing path 27, the second mixing path 51, and the second hot water supply path 54 is switched from tap water to water at the hot water supply set temperature Th, The situation where the temperature of the water flowing through these pipes rises is similar to the situation where the temperature of the water flowing through the pipe rises when switching from the second hot water supply operation to the first hot water supply operation. Therefore, in determining the fire extinguishing time of the burner 53, the fire extinguishing time can be appropriately determined by using the pipe capacity Vh at the time of temperature increase.

  In FIG. 2, when the hot water mode in step S3 is completed, the process proceeds to step S4, and the cold water mode is executed. Specifically, the cold water mode is executed according to the flowchart shown in FIG. When the cold water mode is started, as shown in step S41, the mixer 24 controls the mixing ratio of the stored water from the hot water tank 21 and the tap water to be 0: 1. That is, the hot water control valve 25a is controlled to a fully closed state, and the water supply control valve 26a is controlled to a fully open state. Thereby, tap water flows again as mixed water from the first mixing path 27 to the second hot water supply path 54. In FIG. 6, the cold water mode is started at time t3.

  Next, the process proceeds to step S42, and it is determined whether or not the water temperature detected by the mixing thermistor 27a is equal to or lower than the second predetermined temperature T2. The second predetermined temperature T2 is set to a temperature 5 ° C. higher than the water temperature detected by the water supply thermistor 26c, that is, a temperature 5 ° C. higher than the tap water temperature Tw. The determination in step S42 is repeated until the water temperature detected by the mixing thermistor 27a becomes equal to or lower than the second predetermined temperature T2. As shown in FIG. 6, when the water temperature (A) detected by the mixed thermistor 27a reaches the second predetermined temperature T2 at time tw1, the water temperature detected by the mixed thermistor 27a is set to the second temperature in step S42 of FIG. It is determined that the temperature has become equal to or lower than the predetermined temperature T2. Thereby, it transfers to step S43 and this time tw1 is memorize | stored as cold water 1st time tw1.

  Next, the process proceeds to step S44, where it is determined whether or not the water temperature detected by the hot water thermistor 56 is equal to or lower than the second predetermined temperature T2. The determination in step S44 is repeated until the water temperature detected by the hot water thermistor 56 becomes equal to or lower than the second predetermined temperature T2. As shown in FIG. 6, when the water temperature (B) detected by the tapping thermistor 56 reaches the second predetermined temperature T2 at the timing tw2, the water temperature detected by the tapping thermistor 56 is set to the second temperature in step S44 of FIG. It is determined that the temperature has become equal to or lower than the predetermined temperature T2. Thereby, it transfers to step S45 and memorize | stores this time tw2 as cold water 2nd time tw2. Thereafter, the process proceeds to step S46, and a time difference Δ (tw2−tw1) between the cold water first time tw1 and the cold water second time tw2 is calculated.

  In the cold water mode, the tap water is allowed to flow from the first mixing path 27 to the second hot water supply path 54. In steps S42 and S44, the water temperature detected by the mixing thermistor 27a and the hot water thermistor 56 is the tap water temperature Tw. Instead of determining whether or not the water temperature detected by the water supply thermistor 26c is reached, it is determined whether or not the second predetermined temperature T2 is 5 ° C. higher than the temperature Tw of the tap water. Therefore, as shown in FIG. 6, the water temperature detected by the mixed thermistor 27a and the tapping thermistor 56 changes from the hot water supply set temperature Th to the tap water temperature Tw (per unit time as shown in the graphs A and B). Since the second predetermined temperature T2 is reached when the water temperature change rate is high), the time when the water temperature detected by the mixing thermistor 27a and the hot water thermistor 56 reaches the second predetermined temperature T2 can be accurately specified. Therefore, the cold water time difference Δ (tw2−tw1) between the cold water first time tw1 and the cold water second time tw2 can also be accurately specified.

  After the time difference Δ (th2−th1) is specified, the process proceeds to step S47, and the temperature drop piping capacity Vw is derived. The temperature drop piping capacity Vw is derived by multiplying the cold water time difference Δ (tw2−tw1) by the mixed water flow rate (shower flow rate in this embodiment). The temperature drop piping capacity Vw is used to determine the ignition timing of the burner 53 when the hot water use operation is changed from the first hot water supply operation to the second hot water supply operation. That is, in the first hot water supply operation, the temperature of the water flowing out of the mixer 24 is the hot water supply set temperature Th, and when the detected water temperature of the upper thermistor 39 of the hot water storage tank 21 is decreased, the temperature of the water flowing out of the mixer 24 is also decreased. Thus, the temperature becomes lower than the hot water supply set temperature Th, and the burner 53 is ignited. When switching to the cold water mode after the end of the hot water mode, the first mixing path 27, the second mixing path 51, and the second hot water supply path 54 change from a state in which hot water at the hot water supply set temperature Th flows to a state in which tap water flows. Therefore, the temperature of the mixed water flowing through these pipes decreases. This situation is similar to the state of switching from the first hot water supply operation to the second hot water supply operation. Therefore, when determining the ignition timing of the burner 53, the ignition timing can be appropriately determined by using the temperature drop piping capacity Vw. As described above, the cold water mode ends, and the trial run program of FIG. 2 also ends.

  In the present embodiment, the pipe capacity Vh at the time of temperature rise and the pipe capacity Vw at the time of temperature drop are derived as the pipe capacity from the mixed thermistor 27a to the hot water thermistor 56 by the trial operation program executed at the time of construction. During hot water supply use operation, the fire extinguishing timing of the burner 53 is determined using the pipe capacity Vh at the time of temperature increase, and the ignition timing of the burner 53 is determined using the pipe capacity Vw at the time of temperature decrease. In particular, in this embodiment, since the hot water storage unit 20 and the hot water supply unit 50 are assembled at the time of construction, the pipe capacity V cannot be grasped in advance. However, according to the present embodiment, the piping capacity from the vicinity of the outlet of the mixer 24 to the burner heat exchanger 52 can be derived before the user uses the hot water supply system. Therefore, when the user uses the hot water supply system 10, ignition and extinguishing timing of the burner 53 that heats the burner heat exchanger 52 can be appropriately determined based on the pipe capacity V already derived.

(Modification of Example 1)
In the initial condition setting in step S2 of FIG. 2, when the detected water temperature of the hot water thermistor 56 and the detected water temperature of the feed water thermistor 26c become 1 ° C. or less in step S23 of FIG. 3, the process proceeds to the end, and the hot water of step S3 of FIG. I am trying to move to mode. However, in step S23 of FIG. 3, it may be determined whether or not a predetermined period (for example, several seconds) has elapsed after the detected water temperature of the hot water thermistor 56 and the detected water temperature of the feed water thermistor 26c are 1 ° C. or lower. .
In addition, when moving from the hot water mode of step S2 in FIG. 2 to the cold water mode of step S3, the cold water is supplied on condition that a predetermined period (several seconds) has elapsed since the detected water temperature of the hot water thermistor 56 has reached the hot water supply set temperature Th. You may make it move to mode.
Thereby, since the water temperature which flows through piping can be stabilized, it can switch to another mode, Therefore The period required until the water temperature detected by the mixing thermistor 27a and the tapping thermistor 56 reaches predetermined temperature is stabilized. It is possible to more accurately specify the time difference between the times when the water temperature detected by the mixed thermistor 27a and the hot water thermistor 56 reaches a predetermined temperature.

Next, the hot water supply system of Example 2 is demonstrated based on FIG. The hot-water supply system 10 of Example 2 is the same structure as Example 1 shown in FIG. In the present embodiment, the trial run program is performed according to the flowchart of FIG. 7 instead of the trial run program according to the flowchart of FIG.
In the trial run program of the second embodiment, steps S11 to S14 shown in the flowchart of FIG. 7 are the same processes as steps S1 to S4 of the trial run program of the first embodiment. In the present embodiment, after the cold water mode of step S14 is executed, the process proceeds to step S15 and the second hot water mode is executed. In the second warm water mode, the series of processes shown in FIG. 4 is performed, and the pipe temperature Vh at the time of temperature rise in the second warm water mode is derived. Further, in the second hot water mode, the pipe temperature Vh at the time of temperature rise derived in the previous hot water mode in step S13 and the pipe capacity Vh at the time of temperature rise derived in the current hot water mode in step S15 are averaged. Processing is performed. When the fire extinguishing timing of the burner 53 is determined during the hot water supply use operation, the averaged pipe temperature Vh at the time of temperature rise is used.

  Further, in the present embodiment, after the hot water mode of step S15 is executed, the process proceeds to step S16 and the second cold water mode is executed. In the second cold water mode, the series of processes shown in FIG. 5 is performed, and the temperature drop piping capacity Vw in the second cold water mode is derived. Further, in the second cold water mode, the cooling pipe capacity Vw derived in the previous cold water mode in step S14 and the cooling pipe capacity Vw derived in the current warm water mode in step S15 are averaged. Is done. In the case of determining the ignition timing of the burner 53 during the operation of using hot water, this averaged cooling pipe capacity Vw is used.

As described above, in this embodiment, each of the hot water mode and the cold water mode is executed a plurality of times, and the values obtained by averaging the pipe capacities derived in each hot water mode or the cold water mode are used as the ignition timing and extinguishing timing of the burner 53. It is used to make a decision. Thereby, the error of the piping temperature Vh at the time of temperature rise and the piping capacity Vw at the time of temperature fall derived can be reduced.
In this embodiment, the hot water mode and the cold water mode are each executed twice, but may be executed three times or more. As the number of executions of the hot water mode and the cold water mode increases, the errors in the temperature rising pipe capacity Vh and the temperature decreasing pipe capacity Vw can be reduced.

(Other examples)
In each of the above embodiments, a general hot water supply set temperature (42 ° C.) is set in advance as the hot water set temperature Th during execution of the hot water mode of the trial run program. However, the hot water supply set temperature may be changed by an operation button of the controller 11 by a contractor who performs a trial operation. Further, when the hot water mode is executed a plurality of times as in the second embodiment, the hot water supply set temperature Th may be set to be different between the first hot water mode and the second hot water mode. . Moreover, the structure which can change the hot_water | molten_metal supply preset temperature Th of each warm water mode by the installer may be sufficient. By deriving the pipe capacity Vh at the time of temperature rise in this manner, the ignition timing and the fire extinguishing timing of the burner 53 can be appropriately determined even when a plurality of hot water supply set temperatures Th are set during hot water use operation. . Moreover, the error of the pipe capacity Vh at the time of temperature rise can be reduced more by performing the warm water mode of a plurality of patterns.

In each of the above embodiments, the pipe capacity Vh at the time of temperature rise and the pipe capacity Vw at the time of temperature drop are individually used to determine the fire extinguishing timing and the ignition timing of the burner 53. The pipe capacity obtained by averaging the hour pipe capacity Vw may be used to determine the fire extinguishing timing and ignition timing of the burner 53. Further, this pipe capacity may be used for other control.
In each of the above embodiments, the tapping thermistor 55 is used as the second detecting means for detecting the water temperature in the vicinity of the burner heat exchanger 51. However, the incoming thermistor 51a may be used as the second detecting means. Note that when the pipe capacity is derived based on the detected water temperature of the hot water thermistor 56, the pipe capacity including the capacity of the burner heat exchanger 51 can be derived. By determining the extinguishing time, after the mixed water whose adjusted temperature has been changed by the mixer 24 passes through the burner heat exchanger 51, the burner 53 is ignited and extinguished.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

10: Hot water supply system 11: Controller 13: Remote control 16: Trial operation switch 17: Display screen 20: Hot water storage unit 21: Hot water storage tank 22: Water supply path 22a: Tap water inlet 23: Pressure reducing valve 24: Mixer 25: Hot water path 25a: Hot water Control valve 25b: Hot water flow sensor 25c: Hot water thermistor 26: Mixed water supply path 26a: Water supply control valve 26b: Water supply flow sensor 26c: Water supply thermistor 27: First mixing path 27a: Mixed thermistor 28: Hot water supply bypass path 28a: Bypass control valve 29: First hot water supply path 29a: Hot water supply thermistor 31: Drainage path 32: Drainage valve 33: Circulation forward path 34: Circulation return path 36: Outbound thermistor 37: Circulation pump 38: Pressure release path 38a: Relief valve 39: Upper thermistor 40: Heat pump Unit 41: Compressor 42: Four-way valve 43: First heat exchanger 4 a: Heat medium flow path 43b: Circulating water flow path 44: Expansion valve 45: Second heat exchanger 45a: Fan 46: Heat medium pipe 47: Defrost path 47a: Defrost valve 48: Circulation forward path connection path 48a: Inlet side Thermistor 49: Circulation return path connection path 49a: Outlet thermistor 50: Hot water supply unit 51: Second mixing path 51a: Inflow thermistor 51b: Hot water quantity sensor 51c: Water quantity servo 52: Burner heat exchanger 53: Burner 54: Second hot water path 55: Can thermistor 56: Hot water thermistor 57: Heat source bypass path 58: Heat source bypass control valve 60: Hot water tap

Claims (7)

A hot water tank,
A mixer that mixes the stored water and tap water flowing out of the hot water tank;
A heating unit for heating the mixed water flowing out of the mixer;
First detection means for detecting the water temperature in the vicinity of the outlet of the mixer;
Second detection means for detecting a water temperature in the vicinity of the heating unit;
Storage means for storing a test run program;
Control means for executing the trial run program,
The commissioning program is
(1) Change the mixing ratio of the mixer,
(2) specifying a time difference between a time when the water temperature detected by the first detection means reaches a predetermined temperature and a time when the water temperature detected by the second detection means reaches the predetermined temperature;
(3) Specify the flow rate of the mixed water,
(4) including a process of deriving a pipe capacity from the vicinity of the mixer outlet to the vicinity of the heating unit from the time difference and the flow rate ,
The trial operation program derives the pipe capacity based on the time difference when the water temperature detected by the first detection means and the second detection means rises, and the derived pipe capacity at the time of temperature rise. Including processing to remember,
The control program at the time of hot water supply use operation includes a process of reading out the stored temperature rising pipe capacity and determining the heating stop timing of the heating unit based on the read temperature rising pipe capacity A hot water supply system that is characteristic. The trial operation program stores a process for deriving the pipe capacity based on the time difference when the water temperature detected by the first detection means and the second detection means is lowered, and the derived pipe capacity at the time of temperature decrease is stored. Including processing to keep
The control program at the time of hot water supply use operation includes a process of reading a stored temperature drop pipe capacity and determining a heating start time of the heating unit based on the read temperature drop pipe capacity The hot water supply system according to claim 1. A hot water tank,
A mixer that mixes the stored water and tap water flowing out of the hot water tank;
A heating unit for heating the mixed water flowing out of the mixer;
First detection means for detecting the water temperature in the vicinity of the outlet of the mixer;
Second detection means for detecting a water temperature in the vicinity of the heating unit;
Storage means for storing a test run program;
Control means for executing the trial run program,
The commissioning program is
(1) Change the mixing ratio of the mixer,
(2) specifying a time difference between a time when the water temperature detected by the first detection means reaches a predetermined temperature and a time when the water temperature detected by the second detection means reaches the predetermined temperature;
(3) Specify the flow rate of the mixed water,
(4) including a process of deriving a pipe capacity from the vicinity of the mixer outlet to the vicinity of the heating unit from the time difference and the flow rate,
The trial operation program stores a process for deriving the pipe capacity based on the time difference when the water temperature detected by the first detection means and the second detection means is lowered, and the derived pipe capacity at the time of temperature decrease is stored. Including processing to keep
The control program at the time of hot water supply use operation includes a process of reading a stored temperature drop pipe capacity and determining a heating start time of the heating unit based on the read temperature drop pipe capacity Hot water supply system. The trial operation program repeatedly switches the mixing ratio of the mixer between a cold water mode in which water: tap water is 0: 1 and a hot water mode in which the temperature of the mixed water is equal to the hot water supply set temperature. The hot water supply system according to any one of claims 1 to 3, wherein The hot water supply system according to claim 4, wherein the predetermined temperature is set to a temperature between the tap water temperature and the hot water supply set temperature. The hot water supply system according to claim 4 or 5, wherein the trial operation program switches between the cold water mode and the hot water mode on condition that the water temperature detected by the second detection means is stable.   The hot water supply system according to any one of claims 1 to 6, wherein the trial run program sets a flow rate of the mixed water to a shower flow rate.

Images