JP5051366B2 - Instant hot water control device and instant hot water system equipped with the instant hot water control device - Google Patents

Description

  The present invention provides a heating medium for heating so that the hot water can be used by immediately discharging the hot water from the hot water tap without waiting for the hot water from the heat source machine to flow to the hot water tap when the hot water tap is opened. In particular, a hot water control apparatus that executes hot water control for an immediate hot water system that is preheated using a hot water as a heat source. Even when there are hot water taps that have been extended to the hot water tap and used for hot water and hot water taps that have not been used for a while, the hot water in each branch hot water supply pipe is evenly heated. Related to control technology.

  Conventionally, as an immediate hot water system, a hot water supply pipe extending from a hot water supply source to a hot water tap is combined with a circulation pipe for going and returning, and the hot water from a hot water circulation type heating heat source machine is combined with the circulation pipe. Has been proposed that circulates as a heat source (see, for example, Patent Document 1). That is, circulating hot water as a heat source is circulated and supplied to hot water remaining in each branch hot water supply pipe from the hot water supply source to a plurality of hot water taps, and heat is transferred through the circulation pipe and hot water supply pipe that are in contact with each other. By exchanging liquid-liquid heat, the hot water in the hot water supply pipe is heated and maintained at a predetermined temperature, and when the hot water tap is opened, the heated hot water is discharged immediately. is there.

JP 2006-317092 A

  By the way, with what was proposed by the above-mentioned literature, a hot water header is incorporated in a hot water supply pipe, and the downstream side is branched into two or more hot water supply pipes by the immediate hot water header, and hot water can be supplied to two or more hot water taps by the branched hot water supply pipe. However, all of the branch hot water supply pipes can be heated by the heated hot water circulated and supplied to the one circulation pipe.

  However, if hot water is used in a plurality of hot water taps, for example, in a kitchen hot water tap, hot water close to the set hot water temperature will remain in the branch hot water pipe extending to the kitchen hot water tap even if the hot water use is stopped. become. On the other hand, no hot water is used in other hot water taps such as washrooms, and hot water whose temperature has dropped to a temperature considerably lower than the set hot water temperature stays in the branch hot water supply pipe extending to the hot water tap. As described above, when the hot water supply of the heat source is circulated and supplied to a plurality of branch hot water supply pipes having a variation in the hot water supply use situation and the temperature state of the accumulated hot water in the interior being uneven, Although the desired warming is performed in the branch hot water supply pipe that has not been present for a while, the branch hot water supply pipe that has been used immediately before the hot water supply is excessively heated.

  The present invention has been made in view of such circumstances, and an object thereof is a hot water supply pipe branched into a plurality of pipes so as to extend to a plurality of hot water taps, and is caused by a difference in usage conditions of hot water supplies. An instant hot water control apparatus capable of uniformly heating even a plurality of branch hot water supply pipes in which the temperature conditions of hot water staying in the interior are non-uniform by circulating supply of a heating heat source is provided. .

  In order to achieve the above object, in the present invention, hot water from a hot water source is branched into two or more branch hot water pipes by a header and led to two or more hot water taps. On the other hand, a circulation pipe that circulates and supplies the heat medium from the heating heat source machine through the heat medium supply switching valve is added, and the hot water supply operation is stopped by the heat medium that is circulated and supplied to the circulation pipe by opening and closing control of the heat medium supply switching valve. The following specific items are provided for an immediate hot water control apparatus that controls hot water operation so that hot water in a hot water supply pipe is heated by liquid-liquid heat exchange and maintained at a predetermined target temperature. That is, it comprises a temperature detection means for detecting the temperature of hot water in the hot water supply pipe before branching, and an immediate hot water operation control unit for executing the immediate hot water operation control. The presence or absence of hot water use in one of the two or more branch hot water supply pipes is determined based on the combustion history of the hot water supply heat source machine. The system is switched to a convergent heating process that repeats heating based on the temperature detected by the temperature detecting means while applying a restriction (claim 1).

  In the case of the present invention, there is a mixture of hot water supply used in a plurality of branch hot water supply pipes and one that has not been used, and the temperature of the internal hot water is close to the set hot water temperature if hot water is used. Even if the temperature conditions are not uniform, such as when the temperature is not uniform, such as if the temperature is not uniform, the convergence heating process is repeated in the branched hot water supply pipe where hot water is used. While suppressing excessive heating, it is possible to efficiently heat hot water in branch hot water supply pipes that have not been used for hot water supply, so that all branch hot water supply pipes have a uniform temperature regardless of whether hot water is used or not. It will be possible to reach the warmed state at an early stage.

  As the convergent heating process in the present invention, either a predetermined immediate hot water timer is up or a temperature detected by the temperature detecting means is raised to a determination temperature based on the target temperature is satisfied. The heating medium is circulated and supplied to the circulation pipe until it is heated, while the circulation supply of the heating medium to the circulation pipe is stopped if any of the above conditions is satisfied (claim 2). ). By adopting such a configuration, it is possible to efficiently heat the hot water in the branch hot water supply pipe not used for hot water while suppressing excessive heating in the branch hot water supply pipe used for hot water supply. A reliable process can be realized as the heating process.

  The hot water supply from the hot water supply heat source machine is branched into two or more branch hot water supply pipes by a header and led to two or more hot water supply pipes, and the heating medium supply switching valve from the heating heat source machine to each of the branch hot water supply pipes. A circulation pipe that circulates and supplies the heat medium via the heating medium is added, and the hot water in the hot water supply pipe that is not operating in the hot water supply operation is heated by liquid-liquid heat exchange with the heat medium that is circulated and supplied to the circulation pipe. By providing the instant hot water control device according to claim 1 or 2 for the instant hot water system configured to be maintained in the above (claim 3), It is possible to realize an instant hot water system capable of obtaining the above action.

  As described above, according to the instant hot water control device of claim 1 or claim 2, the hot water use used in the plurality of branch hot water supply pipes and the one that did not exist are mixed, Even if the temperature conditions are non-uniform, the temperature of the accumulated hot water is close to the set hot water temperature if hot water is used, and drops from the set hot water temperature to a very low temperature if hot water is not used. By switching to temperature treatment and repeating this converged warming treatment, while suppressing excessive heating in the branch hot water supply piping where hot water is used, the hot water in the branch hot water piping not using hot water is efficiently used. It can be warmed up well, and it becomes possible to quickly reach a state where all the branched hot water supply pipes are heated to a uniform temperature regardless of whether or not hot water is used.

  In particular, according to the second aspect, the convergent heating process described above can be realized, thereby preventing excessive heating in the branched hot water supply pipe where hot water is used, but not using hot water. As a result, a reliable process can be realized as a convergent heating process in which hot water in the branched hot water supply pipe is efficiently heated.

  Moreover, according to the instant hot water system of claim 3, it is possible to provide an instant hot water system capable of obtaining all the effects based on the instant hot water control device of claim 1 or claim 2.

  FIG. 1 shows an immediate hot water control apparatus according to an embodiment of the present invention and an immediate hot water system to which this is applied. In the figure, reference numeral 1 denotes a heat source machine, and this heat source machine 1 is constructed by integrating a heating medium circulation type heating heat source machine 2 and a hot water supply heat source machine 3 in the same housing. Such a heat source device 1 is also referred to as a hot water heater with a heating medium circulation type heating function or a heating medium circulation type heater with a hot water supply function. However, the present invention is not limited to this, and it may be an immediate hot water system including a heating heat source machine 2 and a hot water supply heat source machine 3 that are configured independently of each other. In the instant hot water system of the present embodiment, hot water is supplied from the hot water supply heat source 3 to the heating and hot water header 5 through the main hot water supply pipe 40, and then through the branched hot water supply pipes 41, 42, and 43 branched by the heating and hot water header 5. The hot water supply is branched and supplied to various hot water supply taps 61, 62, 63. A heating medium (for example, hot water; hereinafter referred to as “hot water”) from the heating heat source unit 2 is circulated and supplied to the main hot water supply pipe 40 and the branched hot water supply pipes 41, 42, 43. The main hot water supply pipe 40 and the branched hot water supply pipes 41, 42, 43 constitute the hot water supply pipe 4. Details will be described below.

  The heating heat source machine 2 has an expansion tank 21, a circulation pump 22, a combustion burner 23, a heat exchanger 24, and a heating header 25 with a thermal valve, as illustrated in detail in FIG. The heating return header 26 is provided, and the heat medium is circulated and supplied to various radiators. And according to the heat radiator to circulate, the hot water of two types of temperature, high temperature water (for example, 80 degree hot water) and low temperature water (for example, 60 degree hot water) can be circulated and supplied.

  If the radiator is, for example, a bathroom dryer 71 that requires high-temperature water, the circulation pump 22 is activated, the combustion burner 23 is activated, and the heat medium in the expansion tank 21 is passed through the return path 27 to the heat exchanger. 24, the heat medium heated by heat exchange with the combustion heat of the combustion burner 23 and heated up to a predetermined high temperature is supplied to the bathroom dryer 71 through the high temperature outgoing path 28 and the high temperature outgoing pipe 72 outside the apparatus. The heat medium that has dissipated heat in the bathroom dryer 71 and returned to a low temperature is returned to the heating return header 26 through the return pipe 73 and then returned to the expansion tank 21. Thereafter, this is repeated and a high-temperature heat medium is circulated and supplied to the bathroom dryer 71, and accordingly, the heat medium after heat dissipation is returned to the expansion tank 21.

  Further, if the radiator is a floor heater 74 that requires a low-temperature heat medium, for example, by opening the thermal valve corresponding to the floor heater 74 in the heating header 25 and operating the circulation pump 22, The low-temperature heat medium in the expansion tank 21 is supplied to the floor heater 74 as it is through the low-temperature forward passage 29, the heating forward header 25, and the low-temperature forward piping 75. Then, the heat medium having the value after being radiated by the floor heater 74 is returned to the expansion tank 21 through the return pipe 76 and the heating return header 26. In FIG. 2, only one floor heater 74 is shown as a radiator that receives the circulation supply of the low-temperature heat medium. As many as the number of branches such as the heating header 25 can be connected.

  The heating header 25 is individually connected to an inlet side connection port connected to the downstream end of the low temperature outgoing path 29, an outlet side connection port of the same number as a predetermined number of branches, and a position before the outlet side connection port. A hot water supply switching valve (heat medium supply switching valve) that is interposed, and allows hot water flowing from the inlet side connection port to flow out to the outlet side connection port where the thermal valve is open. It is like that. The heating return header 26 is provided with a predetermined number of inlet connection ports and an outlet connection port on the return side to the expansion tank 21, and joins the hot water returned from each inlet connection port. Then, it returns to the expansion tank 21 from the outlet side connection port. Note that a closing plug is connected to the unused outlet connection port of the heating header 25 and the unused inlet connection port of the heating return header 26 to be closed.

  The hot water supply heat source unit 3 includes a water supply path 31, a combustion burner 32, a heat exchanger 33, and a hot water supply path 34, and water supplied by the water supply path 31 passes through the heat exchanger 33. In the meantime, hot water heated by heat exchange from the combustion burner 32 and heated to a predetermined temperature is discharged to the hot water outlet 34. The water supply passage 31 is provided with an incoming water flow rate sensor 35, and the hot water supply passage 34 is provided with a hot water supply temperature sensor 36 and a flow rate adjusting valve 37. The upstream end of the main hot water supply pipe 40 is connected to the outlet hot water connection port 341 at the downstream end of the outlet hot water passage 34. In this hot water supply heat source unit 3, when any one of the hot water supply taps 61, 62, 63 is opened and a flow rate exceeding the minimum operating flow rate is detected by the incoming water flow rate sensor 35, hot water supply operation control by the heat source device controller 8 is started. Combustion control or the like based on the temperature detected from the temperature sensor 36 is performed, whereby the hot water supply temperature to the hot water taps 61, 62, 63 is set to, for example, the set hot water temperature input and set in the remote controller 81. . Although only one remote controller 81 is shown in FIG. 1 or FIG. 2, two or more remote controllers 81 may be provided. For example, the remote controller 81 is installed in the kitchen if the hot-water tap 61 is a kitchen curan, in the bathroom if the hot-water tap 62 is a wash-curn, or in the bathroom if the hot-water tap 63 is a bath curan or shower curan. You may do it.

  As shown in FIG. 3, the heating and hot water header 5 includes a hot water supply header portion 51, a hot water going header portion 52, and a hot water return header portion 53 that are integrally formed of, for example, casting or synthetic resin. . The hot water supply header 51 has one inlet 510 to which the downstream end of the main hot water supply pipe 40 is connected, and outlets 511, 512, and 513 having the same number as the predetermined number of branches (three in the illustrated example) communicating with the inlet 510. Similarly, the hot water going header section 52 has one inlet 520 to which a downstream end of a hot water going pipe 90, which will be described later, is connected in communication, and outlets 521, 522, and 523 having the same number as the number of branches connected to the inlet 520. The hot water return header section 53 includes the same number of inlets 531, 532, 533 as the number of branches, and one outlet 534 communicating with each of the inlets 531, 532, 533. The downstream end of the main hot water supply pipe 40 is connected to the inlet 510 of the hot water supply header 51, the upstream end of the branched hot water supply pipe 41 is connected to the outlet 511, the upstream end of the branched hot water supply pipe 42 is connected to the outlet 512, and the branched hot water supply pipe is connected. The upstream end of 43 is connected to the outlet 513 in communication.

  Further, the inlet 520 of the warm water going header section 52 is connected to one thermal valve 251 (see FIG. 2) having the heating going header 25 and the downstream end of the warm water going pipe 90 connected to the connection port, The upstream end of the first hot water circulation piping 91 is the outlet 521, the upstream end of the second hot water circulation piping 92 is the outlet 522, and the upstream end of the third hot water circulation piping 93 is the upstream end 93. Each of the outlets 523 is connected in communication. Then, the downstream end of the forward piping portion 91 of the first hot water circulation piping is extended along the branch hot-water supply piping 41 to a position near or near the hot-water tap 61, and then folded, and then becomes a return piping portion 94. Along with the hot water supply pipe 41, it is returned to the heating and hot water header 5 and connected to the inlet 531 of the hot water return header 53. Similarly, the downstream end of the outgoing pipe section 92 of the second hot water circulation pipe is extended along the branch hot water supply pipe 42 to the position closest to the hot water tap 62, and then folded back. Along with the pipe 42, it is returned to the heating and hot water header 5 and connected to the inlet 532 of the hot water return header 53. In addition, the downstream end of the outgoing pipe section 93 of the third hot water circulation pipe is extended along the branch hot water supply pipe 43 to the position closest to the hot water tap 63 and then folded back. Along with the pipe 43, it is returned to the heating and hot water header 5 and connected to the inlet 533 of the hot water return header 53. The upstream end of the hot water return pipe 97 is connected to the outlet 534 of the hot water return header section 53, and the downstream end of the hot water return pipe 97 is connected to one connection port where the heating return header 26 is provided.

  Three main hot water supply pipes 40 are assembled together with the hot water return pipe 90 and the hot water return pipe 97, and each branch hot water supply pipe 41, 42, 43 is also connected to the above-described forward pipe parts 91, 92. , 93 and the return piping portions 94, 95, 96, respectively, are assembled together into one. For example, as shown in FIG. 4, the hot water outlet pipe 90 and the hot water return pipe 97 are brought into contact with the main hot water supply pipe 40 so that heat can be transferred and bundled together by, for example, aluminum tape 901 and assembled. The outer periphery is covered with a protective cylinder 902 so that heat insulation or the like is performed, and these are collected as one. Similarly, three of the branched hot water supply pipe 41, the forward piping section 91 and the return piping section 94 are combined into one, and three of the branched hot water supply pipe 42, the forward piping section 92 and the return piping section 95 are combined into one. The branch hot water supply pipe 43, the forward pipe section 93, and the return pipe section 96 are grouped into one.

  As described above, during the heating operation in which the circulation pump 22 and the combustion burner 23 of the heating heat source unit 2 are operated by the heat source unit controller 8 or the immediate hot water controller 10 described later, the corresponding thermal valve 251 of the heating forward header 25 is opened. When the hot water heating circulation is started in which the hot water is supplied to the hot water going pipe 90, the hot water is supplied to the hot water going header section 52 through the hot water going pipe 90, and then each of the first to third outgoing pipe parts. 91, 92, 93 is branched and supplied, folded back in the vicinity of each hot water tap 61, 62, 63, flows through each return pipe 94, 95, 96 and returned to the hot water return header 53, where it merges and returns to the hot water The hot water circulates so as to be returned to the heating return header 26 through the pipe 97. The hot water outlet pipe 90, the hot water outlet header section 52, the outgoing pipe sections 91, 92, 93, the return pipes 94, 95, 96, and the hot water return pipe 97 are hot water supply pipes for realizing an immediate hot water function. A circulation pipe of warm water (heating medium) for heating 4 is configured.

  And the principle by which the hot water in the hot water supply piping 4 is heated by the hot water circulated and supplied is as follows. That is, when the hot water circulating supply is stopped in the hot water supply unit 3, that is, hot water for hot water supply is contained in the main hot water supply pipe 40, the hot water supply header 51, and the branch hot water supply pipes 41, 42, 43. When executed in a state where it remains and stays, first, the hot water in the main hot water supply pipe 40 is heated by receiving heat transfer from the hot water supplied to the hot water outgoing pipe 90, and Hot water is heated by receiving heat transfer from the hot water supplied to the hot water going header section 52, and then hot water in each branch hot water supply pipe 41, 42, 43 is supplied to the outgoing pipe sections 91, 92, 93. The warm water that has been heated by receiving heat transfer from the pipe and has become low in temperature by the amount of the above heating (liquid-liquid heat exchange heating) returns to the return pipe portions 94, 95, 96, the hot water return header portion 53, and the hot water return piping. While returning through 97, some of the hot water It will give the heat. Thereby, all the hot water for hot water staying in the path from the hot water supply heat source unit 3 to each hot water tap 61, 62, 63 is heated while the hot water supply operation is stopped. Due to natural convection of hot water heated in the pipe 40 or the hot water supply header 51, the warming area rises along the hot water outlet 34 and the hot water supply heat source unit 3 is also heated. At this time, the temperature of the hot water heated in the hot water supply header 51 before branching to each branch hot water supply pipe 41, 42, 43 is detected by the hot water supply header temperature sensor 54 provided in the hot water supply header 51. The detected temperature is input to the immediate hot water controller 10.

  The immediate hot water controller 10 is linked to the heat source device controller 8 and a remote controller 81 via the heat source device controller 8, and information on the operation status of the heating heat source device 2 and the hot water supply heat source device 3 from the heat source device controller 8 and the remote controller. The hot water operation control is executed based on the temperature detected by the hot water supply header temperature sensor 54 while acquiring information and the like input and set in 81. The hot water operation control will be described below with reference to FIG.

  For example, if the immediate hot water switch 812 provided in the remote control 81 for starting the immediate hot water operation is in an OFF state, the thermo request is maintained OFF (NO in step S1 and step S2), while the immediate hot water switch 812 is turned on. If it is done, the thermo-request is turned on (YES in step S2, step S3). Here, “ON” of the thermo request is to request the heat source controller 8 to circulate and supply hot water from the heating heat source unit 2 as a heat source for the hot water operation, and to start circulating supply of hot water. In other words, the respective request signals for the ON operation of the circulation pump 22 of the heating heat source unit 2, the combustion operation of the combustion burner 23, and the opening operation of the thermal valve 251 are output.

  Next, whether or not hot water has been used within a predetermined time t1 (for example, 30 minutes) in the past is determined and confirmed by obtaining from the combustion operation history information of the combustion burner 32 of the hot water supply heat source unit 3 from the heat source device controller 8. (Step S4). Then, if no hot water supply is used in any of the hot water taps 61, 62, 63, the normal heating process from step S5 to S7 is performed (NO in step S4), while the hot water supply is used in any of the hot water taps 61, 62, 63. If there is, the convergence heating process from step S8 to S13 is performed (YES in step S4).

  If no hot water supply is used in any of the hot water taps 61, 62, 63, the accumulated hot water in all the branch hot water supply pipes 41, 42, 43 is in a substantially uniform state, and therefore the detected temperature Th of the hot water supply header temperature sensor 54 is Until the temperature rises to a predetermined second determination temperature Th2 (for example, a set hot water supply temperature input to the remote controller 81 or a temperature slightly lower than that), the hot water is continuously circulated and heated (step S5). NO), if Th rises to the second determination temperature Th2, the thermo-request is turned off, the circulation of hot water is stopped and heating is stopped (YES in step S5, step S6). Here, the second determination temperature Th2 is set with the set hot water temperature input and set in the remote controller 81 as the target temperature. Therefore, basically, it is only necessary to set the same temperature as the set hot water supply temperature as Th2, but in reality, even if the circulating supply of hot water is stopped, the hot water in the hot water supply pipe 4 is changed to hot water in the hot water supply pipe 4 by the remaining heat of the hot water in the circulation pipe. Since a slight temperature increase is expected, considering this, Th2 may be set to a temperature lower by several degrees than the set hot water supply temperature (for example, a set hot water temperature of −2 ° C. or −3 ° C.). In addition, the above-described thermo-request OFF means that other radiators (for example, reference numeral 74 in FIG. 2) may continue the heating operation. This is to shut off the supply of warm water to the warm water delivery pipe 90 by outputting a closing operation signal of the valve 251. Then, the hot water circulates until the temperature Th detected by the hot water supply header temperature sensor 54 decreases to a temperature lower than a third determination temperature Th3 (for example, a set hot water supply temperature −5 ° C.) set in consideration of control hysteresis. If the supply is stopped (NO in step S7), and the detected temperature Th decreases to a lower temperature side than the third determination temperature Th3 (YES in step S7), the process returns to step S2 and steps S2 to S4 are performed. Repeat the process.

  On the other hand, if any of the hot water taps 61, 62, 63 is used, although any of them is unspecified, first, an immediate hot water timer is started (step S8). Until the hot water timer is up (NO in step S9), the detected temperature Th of the hot water header temperature sensor 54 has not risen to the first determination temperature Th1 (for example, the set hot water temperature + 1 ° C or 2 ° C). With the above condition, the system waits for the time elapsed by the instant water timer (NO in step S10, step S9). On the other hand, although the immediate hot water timer is not yet up, if the detected temperature Th rises to the first determination temperature Th1 (NO in step S9, YES in step S10), or if the immediate hot water timer is up ( YES in step S9), the thermo-request is turned off and the circulation of hot water is stopped (step S11). Then, the standby timer is started (step S12), and the heating by the circulation of hot water is stopped until the time (for example, several minutes to several tens of minutes) by the standby timer elapses (in step S13). If NO, if the standby timer is up (YES in step S13), the process returns to step S2 to repeat the processes of steps S2 to S4.

  The first determination temperature Th1 is set as follows. That is, if the use of hot water is in the past, the detected temperature Th is considered to be merely a drop in temperature corresponding to the elapsed time after the end of hot water use from the state of the set hot water temperature during use of hot water. Therefore, in order to prevent the hot water in the branch hot water supply pipe 41, 42 or 43 used for the hot water supply from being excessively heated, the temperature is almost the same as the set hot water temperature, or a slightly higher tolerance of about + 1 ° C or + 2 ° C. The temperature within the range is set as the first determination temperature Th1. On the other hand, the time setting of the immediate hot water timer is performed as follows. That is, it is considered that the temperature of the staying hot water in the branch hot water supply pipe 41, 42 or 43 in which the hot water supply is not used is considerably lower than that in which the hot water is used, and is higher than the set hot water temperature. It is necessary to efficiently heat up the staying hot water whose temperature has decreased considerably. Therefore, the hot water in the branch hot water supply pipe 41, 42 or 43 in which the hot water supply is used is not excessively heated and the hot water in the branch hot water supply pipe 41, 42 or 43 that is not used is efficiently used. A time value (for example, several minutes to several tens of minutes) that can be heated well is set as the immediate hot water timer time.

  According to the processing in the case where the hot water supply is used, in short, with any of the branch hot water supply pipes 41, 42, 43 that have been used in any of the branch hot water supply pipes 41, 42, 43 and have not been used. Even when the temperature of the accumulated hot water is non-uniform, the hot water used in the branch hot water supply pipe 41, 42 or 43 with use of hot water is not excessively heated, but no hot water is used. By performing the control of repeating the control in steps S8 to S13 to warm the staying hot water in the branch hot water supply pipe 41, 42 or 43, the hot water staying in all the branch hot water supply pipes 41 to 43 is uniformly heated. It is possible to converge to the state at an early stage.

<Other embodiments>
In addition, this invention is not limited to the said embodiment, Various other embodiments are included. That is, in the above embodiment, the heating and hot water header 5 is branched into the three branched hot water supply pipes 41, 42, and 43, but the number of branches may be changed as appropriate. In addition to the hot water branch as the branch hot water supply pipes 41, 42, 43 by the heating hot water header 5, the hot water supply to the radiator for heating is performed using the hot water going header section 52 and the hot water return header section 53. You may make it utilize as a header for heating which branches.

  Further, as the detected temperature Th used in the above-described immediate hot water operation control, instead of the detected temperature by the hot water supply header temperature sensor 54, the detected temperature by the hot water temperature sensor interposed in the middle of the main hot water supply pipe 40 is used. Also good.

  Furthermore, although the thermal valve 251 is shown as the heat medium supply switching valve, an open / close switching valve other than the thermal valve may be used.

It is a schematic diagram which shows embodiment of this invention. It is a schematic diagram which illustrates the detailed structure of the heat source machine of FIG. It is an expansion perspective view which shows the detailed structural example of a heating instant hot water header. It is a perspective view of the fracture state which shows the structure of the combination of the hot water supply piping for implement | achieving an immediate hot water function, and the piping for warm water circulation. It is a flowchart which concerns on a hot water operation control.

Explanation of symbols

2 Heating heat source machine 3 Hot water supply heat source machine 5 Heating hot water header (header)
8 Heat source controller 10 Immediate hot water controller (immediate hot water operation control unit)
41, 42, 43 Branch hot water piping 51 Hot water header (header)
52 Hot water going header section 53 Hot water return header section 54 Hot water supply header temperature sensor (temperature detection means)
61, 62, 63 Hot-water tap 90 Hot water outlet piping (circulation piping)
91, 92, 93 Outward piping (circulation piping)
94, 95, 96 Return piping (circulation piping)
251 Thermal valve (Heat supply switching valve)

Claims (3)

Hot water from the hot water source is branched into two or more branch hot water pipes by a header and led to two or more hot water taps, and from each heating hot water source through a heating medium supply switching valve to each branch hot water pipe. In addition to the circulation pipe that circulates and supplies the heat medium, the hot and cold water in the hot water supply pipe is stopped by liquid-liquid heat exchange by the heat medium that is circulated and supplied to the circulation pipe by the switching control of the heat medium supply switching valve. In the hot water control device that controls the hot water operation so as to heat and maintain at a predetermined target temperature,
A temperature detecting means for detecting the temperature of hot water in the hot water supply pipe before branching, and an immediate hot water operation control unit for executing the immediate hot water operation control,
The immediate hot water operation control unit determines whether or not hot water is used in any of the two or more branch hot water supply pipes within a predetermined time immediately before, based on the combustion history of the hot water heat source unit, and uses hot water in any branch hot water supply pipe If there is, the hot water is configured to switch to the convergence heating process that repeats the heating based on the temperature detected by the temperature detecting means while limiting the duration of the heating. Control device. The immediate hot water control device according to claim 1,
The convergence heating process is repeated until the predetermined immediate hot water timer is up or the temperature detected by the temperature detecting means is raised to a determination temperature based on the target temperature. An immediate hot water control apparatus configured to circulate and supply a heating medium to a pipe to heat the pipe, and to stop circulating supply of the heating medium to the circulation pipe if any of the above conditions is satisfied. Hot water from the hot water source is branched into two or more branch hot water pipes by a header and led to two or more hot water taps, and from each heating hot water source through a heating medium supply switching valve to each branch hot water pipe. A circulation pipe that circulates and supplies the heat medium is added, and the hot water in the hot water supply pipe that is not operating in the hot water supply operation is heated by liquid-liquid heat exchange and maintained at the specified target temperature by the heat medium that is circulated and supplied to the circulation pipe. An instant hot water system configured to do so, comprising the immediate hot water control device according to claim 1 or 2.

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