JP3726723B2 - Hot water system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention stores hot water generated by an auxiliary heat source such as solar heat in a heat storage tank, and sends the hot water to a water heater via a hot water supply connection unit that can be mixed with tap water. About.
[0002]
[Prior art]
As a hot water supply system that uses an auxiliary heat source, for example, a hot water supply system that combines a solar water heater that generates hot water using solar heat and a hot water heater is generally known.
[0003]
In such a hot water supply system, a solar water heater and a hot water heater having a heat storage tank for storing hot water generated using solar heat are connected via a hot water connection unit. The hot water stored in the heat storage tank of the solar water heater is sent to the water heater via the hot water connection unit, but the hot water connection unit does not simply send the hot water stored in the heat storage tank to the water heater, If necessary, the hot water supply connection unit can be supplied with only hot water sent from the heat storage tank in a fully opened state so that the hot water sent from the heat storage tank can be mixed with clean water and sent to the water heater. It is equipped with a mixing control valve that sends out only clean water to the water heater when fully closed.
[0004]
Therefore, when hot water equal to or higher than the hot water supply set temperature set for the hot water heater is stored in the heat storage tank, the mixing control valve of the hot water connection unit is heated with hot water equal to or higher than the hot water supply set temperature sent from the heat storage tank. By appropriately mixing with water, hot water at a hot water supply set temperature, which is a target temperature, is generated and sent to a water heater. On the other hand, when hot water equal to or higher than the hot water supply set temperature is not stored in the heat storage tank, the mixing control valve of the hot water supply connection unit appropriately mixes hot water below the hot water supply set temperature sent from the heat storage tank with clean water. Then, it is sent to the water heater in a state where it is forcibly lowered to a fixed temperature which is the target temperature, and hot water at the hot water supply set temperature is generated by burning the burner of the water heater.
[0005]
By the way, in such a hot water supply system, for example, forgetting to open a valve or the like that shuts off a piping path connecting the heat storage tank and the hot water supply connection unit, or the heat storage tank is empty for some reason, the heat storage tank When the hot water supply operation is performed in such a way that no hot water can be sent from the hot water supply connection unit to the hot water supply connection unit, the mixing control valve opens to the fully open side in an attempt to generate hot water at the target temperature, but hot water is supplied from the heat storage tank. Since this is not done, the amount of hot water delivered to the water heater is reduced to a level below the minimum operating water amount of the water heater.
[0006]
Thus, when the amount of warm water delivered to the water heater falls below the minimum operating water amount of the water heater, the hot water supply is recognized as being stopped, and the mixing control valve is in a half-open state that is a standby position when hot water is stopped. Again, when the water supply begins to be sent to the water heater and the same operation is repeated, the mixing control valve starts a hunting operation, and the hot water supply operation cannot be performed normally.
[0007]
Therefore, in the conventional hot water supply system, when such a hunting operation of the mixing control valve occurs, it is determined that hot water cannot be supplied from the heat storage tank, and the mixing control valve is forcibly turned on. By closing and sending only clean water to the water heater, a hot water supply operation is performed without using the hot water stored in the heat storage tank.
[0008]
In addition, depending on the configuration of the hot water supply connection unit, hot water can be sent from the heat storage tank to the hot water supply connection unit. In such a case, it is conceivable to forcibly stop the hot water supply operation by capturing the hunting operation of the mixing control valve and forcibly fully closing the mixing control valve.
[0009]
[Problems to be solved by the invention]
However, the hunting operation of the mixing control valve as described above occurs only when hot water cannot be sent from the heat storage tank to the hot water supply connection unit, or when hot water cannot be sent to the hot water supply connection unit due to water breakage or the like. However, the same condition may occur due to curaning operation, etc.If the mixing control valve is forcibly fully closed by capturing the hunting operation of the mixing control valve, the hot water supply system itself will function normally. Even if it can be activated, if the mixing control valve causes hunting action due to curan operation, etc., the hot water stored in the heat storage tank is effectively used until the operation state is reset. Thus, there is a problem that the hot water supply operation cannot be performed.
[0010]
Then, the subject of this invention is providing the hot-water supply system which can detect only the system abnormality as mentioned above reliably, and can cope with this.
[0011]
[Means for solving the problems and effects thereof]
In order to solve the above-described problems, the invention according to claim 1 includes a hot water heater as a main heat source, a heat storage tank for storing hot water generated by an auxiliary heat source, and hot water sent from the heat storage tank as necessary. And a hot water supply connection unit equipped with a mixing control valve that sends hot water of a target temperature to the water heater by mixing the clean water, and the mixing control valve is only fully heated and sent from the heat storage tank. Is sent from the hot water supply connection unit when the mixing control valve is performing a hunting operation in a hot water supply system in which only the clean water is sent to the hot water heater when it is fully closed. When the temperature of the hot water is equal to or lower than a reference temperature obtained by adding a predetermined temperature to the water temperature, it is determined that the hot water cannot be sent from the heat storage tank to the hot water supply connection unit, and the heat storage tank Salary If it is determined that the delivery a condition not hot water in the connection unit, than it was to forcibly fully closed the mixing control valve.
[0012]
In a state where hot water cannot be sent from the heat storage tank to the hot water supply connection unit, the temperature of the hot water sent from the hot water supply connection unit approaches the temperature of the clean water when the mixing control valve is hunting. Like the hot water supply system described above , not only the hunting operation of the mixing control valve, but also the temperature of hot water sent from the hot water supply connection unit when the mixing control valve is performing hunting operation adds the predetermined temperature to the water temperature. when the determination reference temperature or less, If left to determine that the delivery a condition not hot water for hot water supply connection unit from the thermal storage tank, forcing the mixture regulating valve captures only hunting operation of mixed regulating valve Unlike conventional hot water supply systems that are fully closed, it is possible to identify the hunting operation of the mixing control valve based on curan operation, etc. When a state which can not be delivered hot water for hot water supply connection unit only from, can be switched to the hot water supply operation that does not use hot water stored in the heat storage tank.
[0014]
In particular, as in the hot water supply system of the invention according to claim 2 , the temperature of the hot water sent from the hot water supply connection unit when the mixing control valve is performing the hunting operation is obtained by adding a predetermined temperature to the water temperature. Even if the temperature is below the determination reference temperature, when the mixing control valve is kept in the fully opened state for a predetermined time or more, it is determined that the hot water can be sent from the heat storage tank to the hot water supply connection unit. This makes it possible to identify the hunting operation of the mixing control valve based on the curan operation, etc., even when the temperature of the hot water stored in the heat storage tank is close to the temperature of the clean water, thus improving the determination accuracy. The effect of doing is obtained.
[0015]
Further, after determining that the hot water cannot be sent from the heat storage tank to the hot water supply connection unit and forcibly fully closing the mixing control valve, the hot water supply system as in the hot water supply system of the invention according to claim 3 is used. The mixing control valve may be returned to the normal control state when the operation state is reset by operating the operation switch of the container, or when a predetermined time elapses without resetting the operation state. .
[0016]
Moreover, in order to solve said subject, the invention which concerns on Claim 4 is required for the hot water heater as a main heat source, the thermal storage tank which stores the warm water produced | generated by the auxiliary heat source, and the warm water sent from the said thermal storage tank And a hot water supply connection unit equipped with a mixing control valve that sends hot water of a target temperature to the water heater by mixing clean water according to the mixing water, and the mixing control valve is sent from the heat storage tank in a fully open state. In a hot water supply system that sends only hot water to the water heater, and sends only clean water to the water heater when fully closed, the temperature of the hot water sent from the heat storage tank is equal to or higher than a target temperature, When the temperature of hot water sent from the hot water supply connection unit when the mixing control valve is performing a hunting operation is equal to or higher than a determination reference temperature obtained by adding a predetermined temperature to a target temperature, water supply to the hot water supply connection unit is performed. The Determines that the non-state output, when it is determined that the it is sending a condition not clean water for hot water supply connection unit, than it was to forcibly fully closed the mixing control valve.
[0017]
In a state where clean water cannot be sent to the hot water supply connection unit, the temperature of the hot water sent from the hot water supply connection unit when the mixing control valve is performing the hunting operation is the temperature of the hot water sent from the heat storage tank. Therefore, not only the hunting operation of the mixing control valve as in the hot water supply system described above , but also when the temperature of the hot water sent from the heat storage tank is equal to or higher than the target temperature and the mixing control valve is performing the hunting operation temperature of hot water sent from the hot water supply connection unit is, when the target temperature is determined reference temperature or more obtained by adding a predetermined temperature in advance so as to determine that the delivery a condition not clean water for hot water supply connection unit If, unlike the conventional hot-water supply system adapted forcibly fully closed mixing regulating valve captures only hunting operation of the mixing control valve, mixing based on Curran operation etc. It is possible to identify the hunting operation of the regulating valve, only if the state which can not be delivering clean water to the hot water supply connection unit, it is possible to forcibly stop the hot water supply operation.
[0019]
In addition, after determining that it is impossible to send water to the hot water supply connection unit and forcibly fully closing the mixing control valve, as in the hot water supply system of the invention according to claim 5 , It is desirable to return the mixing control valve to the normal control state only when the operation state is reset by operating the operation switch.
[0020]
In this case, it is determined that the hot water cannot be sent from the heat storage tank to the hot water supply connection unit, and unlike the case where the mixing control valve is forcibly fully closed, no hot water can be supplied. In some cases, hot water supply may be stopped in the open state. In such a case, if the mixing control valve is automatically returned to the normal control state after a predetermined time has elapsed, it is stored in the heat storage tank against the user's intention. This is because the high temperature hot water that is generated may be sent out from the currant.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 shows a schematic configuration of a hot water supply system 1 using solar heat as an auxiliary heat source. In this hot water supply system 1, as shown in the figure, a solar water heater 10 and a hot water heater 30 are connected via a hot water supply connection unit 20, and the hot water generated by the solar water heater 10 is supplied with hot water. It is sent to the hot water heater 30 via the connection unit 20.
[0022]
The solar thermal water heater 10 includes a solar heat exchanger 11 and a sealed heat storage tank 14, and a water supply pipe 15 for supplying clean water to the lower end of the heat storage tank 14 is connected to the heat storage tank 14. In addition, a hot water supply pipe 16 for sending stored hot water to the hot water supply connection unit 20 is connected to the upper end portion.
[0023]
In the solar heat exchanger 11, a heat medium circulation path is formed by a solar pipe 12 connecting the inlet side and the outlet side of the solar heat exchanger 11, and the solar pipe 12 is partially introduced into the heat storage tank 14. The heat exchanger 13 is provided. Therefore, the heat medium heated by the solar heat exchanger 11 is guided into the heat storage tank 14 through the solar pipe 12, and heat exchange with the water in the heat storage tank 14 is performed by the heat exchange unit 13. Hot water is generated in 14.
[0024]
As shown in the figure, the hot water supply connection unit 20 mixes clean water supplied through the water supply pipe 22 and hot water supplied from the heat storage tank 14 through the hot water supply pipe 16 as necessary. The hot water supplied from the heat storage tank 14 is supplied as it is or in a state of being appropriately mixed with tap water through a hot water pipe 23 connected to the outlet side of the mixing control valve 21. 30, and hot water is supplied through the heat exchanger 31 of the water heater 30. In addition, the mixing control valve 21 sends only hot water sent from the heat storage tank 14 through the hot water supply pipe 16 to the water heater 30 in the fully opened state, and conversely, in the fully closed state, it passes through the water supply pipe 22. Only the supplied water is sent to the water heater 30.
[0025]
The water supply pipe 22 and the hot water pipe 23 are connected to each other via a bypass pipe 24 provided with a diaphragm type electromagnetic valve 25 that is fully closed when energized, and the hot water connected to the mixing control valve 21. The supply pipe 16 and the hot water pipe 23 are provided with a hot water temperature sensor 26 for detecting the temperature of hot water sent from the heat storage tank 14 (hereinafter referred to as hot water temperature) Ts, and hot water sent to the hot water supply connection unit 20. Hot water temperature sensor 27 for detecting temperature (hereinafter referred to as hot water temperature) Tw and temperature of hot water sent from hot water supply connection unit 20 (hereinafter referred to as hot water temperature) To 28 is installed.
[0026]
The hot water supply connection unit 20 and the hot water heater 30 are respectively equipped with controllers 20a and 30a that can communicate with each other via a serial interface, and the operation remote controller 40 of the hot water heater 30 is supplied with hot water via a serial interface. A controller 40a that can communicate with the controller 30a of the water heater 30 is mounted. The controllers 20a, 30a, and 40a collectively control the operation of the hot water supply system 1 in cooperation with each other.
[0027]
The controller 20a of the hot water supply connection unit 20 receives temperature detection signals from the hot water temperature sensor 26, the hot water temperature sensor 27, and the hot water temperature sensor 28, as well as the hot water supply set temperature Te and the operation switch set by the operation remote controller 40. A signal, a burner combustion signal, a water flow signal that is turned on upon detection of a water flow exceeding the minimum working water amount, and the like are transmitted from the controller 30a of the water heater 30, and based on these temperature detection signals and the hot water supply set temperature Te. Thus, the controller 20 a of the hot water supply connection unit 20 controls the mixing control valve 21.
[0028]
When the temperature of the hot water delivered from the heat storage tank 14, that is, the hot water temperature Ts detected by the hot water temperature sensor 26 is equal to or higher than the hot water supply set temperature Te, water is appropriately supplied without burning the burner of the water heater 30. Since the hot water at the hot water supply set temperature Te can be supplied by mixing, the temperature of the hot water delivered from the hot water supply connection unit 20, that is, the hot water temperature To detected by the hot water temperature sensor 28 becomes the hot water supply set temperature Te. Thus, hot water supply set temperature control for controlling the mixing control valve 21 is performed.
[0029]
On the other hand, when the hot water temperature Ts is lower than the hot water supply set temperature Te, the hot water at the hot water supply set temperature Te cannot be supplied unless the burner of the hot water heater 30 is burned. The hot water temperature Ts is divided into the case where the hot water temperature Ts is 60 ° C. or more, less than 60 ° C., 35 ° C. or more, and less than 35 ° C., and when it is 60 ° C. or more, 45 ° C. When the temperature is lower than 60 ° C. and higher than 35 ° C., 30 ° C., and when the temperature is lower than 35 ° C., the hot water having a fixed temperature Tf, such as 25 ° C., is sent to adjust the opening of the mixing control valve 21 and mix the clean water. Fixed temperature control is performed.
[0030]
In addition, forgetting to open a valve (not shown) or the like installed in the hot water supply pipe 16 connecting the heat storage tank 14 and the hot water supply connection unit 20, or for some reason the interior of the heat storage tank 14 is empty, The hot water supply operation is performed in a state where no hot water can be sent from the heat storage tank 14 to the hot water supply connection unit 20 or in a state where no hot water can be sent to the hot water supply connection unit 20 due to water outage. As described above, since the mixing control valve 21 cannot perform a normal hot water supply operation due to the hunting operation, the controller 20a of the hot water supply connection unit 20 detects this when a system abnormality occurs. And switching to the appropriate driving action. Hereinafter, the abnormality detection when the system abnormality occurs and the operation operation at that time will be described in detail with reference to the flowcharts shown in FIGS.
[0031]
First, as shown in FIG. 2, after resetting the counter N and the counter M (step S1), it is determined whether or not a state in which the OFF time of the water flow signal is within 2 seconds has occurred (step S2). Here, when the state where the OFF time of the water flow signal does not occur within 2 seconds, it is determined that the mixing control valve 21 is not performing the hunting operation, and the counter N is reset again (step S9). The process proceeds to step S2.
[0032]
On the other hand, when a state where the OFF time of the water flow signal is within 2 seconds occurs in step S2, it is subsequently determined whether or not the tapping temperature To at that time is equal to or higher than the water temperature Tw + 5 ° C. (step S3 ). Here, when the hot water temperature To is equal to or higher than the tap water temperature Tw + 5 ° C., there is a possibility that an abnormality has occurred in the tap water system, so that the hot water temperature To is the target temperature (hot water supply set temperature Te or fixed temperature) Tf) It is determined whether or not Tt + 5 ° C. is exceeded (step S4). Here, when the tapping temperature To is equal to or lower than the target temperature Tt + 5 ° C., it is determined that no abnormality has occurred in the water supply system, the counter N is reset again (step S9), and the process proceeds to step S2.
[0033]
In step S4, when the tapping temperature To is higher than the target temperature Tt + 5 ° C., there is a possibility that an abnormality has occurred in the water supply system, and subsequently, an OFF state within 2 seconds of the water flow signal has occurred. Thereafter, it is determined whether or not the time until the water flow signal is turned off next is less than 20 seconds (step S5). Here, when the ON time of the water flow signal continues for 20 seconds or more, it is determined that the mixing control valve 21 has not caused the hunting operation, and the counter N is reset again (step S9), and then the process proceeds to step S2. Transition.
[0034]
On the other hand, if the ON time of the water flow signal is less than 20 seconds in step S5, the mixing control valve 21 may have caused a hunting operation. Therefore, after adding 1 to the counter N (step S6), It is determined whether or not the counter N = 2 (step S7). Here, when the counter N = 1, there is a high possibility that an abnormality has occurred in the water supply system, so the same operation is repeated by returning to step S2 without resetting the counter N.
[0035]
In step S7, when the counter N = 2, the water flow signal OFF state within 2 seconds occurred again after 20 seconds passed after the water flow signal OFF state within 2 seconds occurred. Therefore, since the mixing control valve 21 is hunting and the hot water temperature To at that time exceeds the target temperature Tt + 5 ° C., the hot water is connected to the hot water supply due to an abnormality in the water supply system, that is, water cut-off etc. Assuming that it cannot be sent to the unit 20 (step S8), the mixing control valve 21 is forcibly fully closed (step S16).
[0036]
As a result, the warm water from the heat storage tank 14 to the hot water supply connection unit 20 is completely cut off. Therefore, when the hot water cannot actually be sent to the hot water supply connection unit 20 due to water cut or the like, The hot water supply operation cannot be performed.
[0037]
On the other hand, in step S3, when the tapping temperature To is lower than the water temperature Tw + 5 ° C., there is a possibility that an abnormality has occurred in the solar water heater system (hereinafter referred to as the solar system). It is determined whether or not the fully open time of the mixing control valve 21 is less than 4 seconds (step S10). Here, if the mixing control valve 21 is fully open for 4 seconds or more, it is determined that no abnormality has occurred in the solar system, the counter M is reset again (step S15), and then the process proceeds to step S2. . In step S10, it is determined whether or not the fully open time of the mixing control valve 21 is less than 4 seconds because the temperature of the hot water stored in the heat storage tank 14 is equal to or lower than the water temperature Tw + 5 ° C. In this case, even if there is no abnormality in the solar system, the tapping temperature To will be lower than the water temperature Tw + 5 ° C., so that such an operating state is not determined as an abnormality in the solar system. .
[0038]
In step S10, when the fully open time of the mixing control valve 21 is less than 4 seconds, there is a possibility that an abnormality has occurred in the solar system. Subsequently, an OFF state within 2 seconds of the water flow signal has occurred. Thereafter, it is determined whether or not the time until the water flow signal is turned off next is less than 20 seconds (step S11). Here, when the ON time of the water flow signal continues for 20 seconds or more, it is determined that the mixing control valve 21 has not caused the hunting operation, the counter M is reset again (step S15), and then the process proceeds to step S2. Transition.
[0039]
On the other hand, if the ON time of the water flow signal is less than 20 seconds in step S11, there is a possibility that the mixing control valve 21 has caused a hunting operation. Therefore, after adding 1 to the counter M (step S12), It is determined whether or not the counter M = 2 (step S13). Here, when the counter M = 1, there is a high possibility that an abnormality has occurred in the solar system, so the same operation is repeated by returning to step S2 without resetting the counter M.
[0040]
In step S13, when the counter M = 2, the water flow signal OFF state within 2 seconds occurs again after 20 seconds have elapsed after the water flow signal OFF state within 2 seconds has occurred. Therefore, the mixing control valve 21 has caused a hunting operation, and the hot water temperature To at that time is lower than the hot water temperature Tw + 5 ° C. Therefore, an abnormality of the solar system, that is, hot water is connected from the heat storage tank 14 Assuming that it cannot be sent to the unit 20 (step S14), the mixing control valve 21 is forcibly fully closed (step S16).
[0041]
As a result, the supply of hot water from the heat storage tank 14 to the hot water supply connection unit 20 is completely blocked, and only clean water is sent to the hot water supply connection unit 20, so that the hunting operation of the mixing control valve 21 is stopped. Then, the hot water storage operation not using the hot water stored in the heat storage tank 14 is switched.
[0042]
The return operation to the normal hot water supply operation state when the mixing control valve 21 is forcibly fully closed as described above will be described below. First, as shown in FIG. 3, it is determined whether or not the user has consciously reset the operation state by turning on and off the operation switch of the operation remote controller 40 of the water heater 30 (step S21). When the operation state is reset automatically, the forced fully closed state of the mixing control valve 21 is released to return to the normal control state (step S24).
[0043]
In step S21, when the user does not consciously reset the operation state, it is determined whether or not the factor that forcedly closes the mixing control valve 21 is due to abnormality of the solar system (step S21). S22) When the mixing control valve 21 is forcibly fully closed based on an abnormality in the water supply system, the control returns to step S21 and only when the user consciously resets the operation state, the mixing control valve 21 Is returned to the normal control state (step S24).
[0044]
On the other hand, in step S22, when the mixing control valve 21 is forcibly fully closed based on the abnormality of the solar system, 4 hours have elapsed since the mixing control valve 21 was forcibly fully closed. Whether or not (step S23). Here, when 4 hours have not elapsed, the process returns to step S21, and the mixing control valve 21 is returned to the normal control state only when the user consciously resets the operation state (step S24). When 4 hours have elapsed, the mixing control valve 21 is automatically returned to the normal control state (step S24).
[0045]
Even when the mixing control valve 21 is returned to the normal control state in this way, an abnormality in the water supply system, which is a factor that forced the mixing control valve 21 to be fully closed. As long as the abnormality of the solar system is not resolved, the same operation is repeated again.
[0046]
Moreover, when there is an abnormality in the solar system, as described above, even if the mixing control valve 21 is fully closed, the hot water is sent to the hot water supply connection unit 20 so that the hot water can be supplied. If there is an abnormality, the hot water supply cannot be performed at all. Therefore, the hot water supply may be stopped with the curan open. In such a case, the mixing control valve 21 is automatically turned on after a predetermined time has elapsed. When returning to the normal control state, hot water stored in the heat storage tank may be sent from the currant against the user's intention, so only when the user consciously resets the operation state The control valve 21 is returned to the normal control state.
[0047]
As described above, in the hot water supply system 1, not only the hunting operation of the mixing control valve 21, but also the hot water temperature To, the water temperature Tw, and the target temperature Tt when the mixing control valve 21 is performing the hunting operation are used. Therefore, since it is determined whether or not there is an abnormality in the water supply system or the solar system, it is possible to reliably identify the hunting operation of the mixing control valve 21 based on the curan operation or the like. Only when an abnormality occurs in the system, the mixing control valve 21 can be forcibly fully closed.
[0048]
In the above-described embodiment, the abnormality detection of the water supply system and the abnormality detection of the solar system are performed at the same time. However, the present invention is not limited to this, and mixing adjustment is performed by detecting any one of the abnormality. It is also possible to force the valve 21 to be fully closed.
[0049]
Further, in the above-described embodiment, when the water flow signal OFF state within 2 seconds has occurred, and when 20 seconds have elapsed before the water flow signal OFF state has occurred again within 2 seconds, the mixing control valve However, the present invention is not limited to this, and the water flow signal OFF time, the water flow signal OFF interval, the number of times the water flow signal is turned off, etc. are actually mixed control valve 21. May be set as appropriate in consideration of the situation when the hunting operation occurs.
[0050]
Moreover, in embodiment mentioned above, although the temperature which added "5 degreeC" to the water temperature Tw and the target temperature Tt is employ | adopted as determination criteria temperature, it is not limited to this, The water temperature Tw or The temperature to be added to the target temperature Tt may be appropriately set in consideration of the fluctuation state of the hot water temperature To when the mixing control valve 21 is hunting.
[0051]
In the above-described embodiment, when the fully open state of the mixing control valve 21 continues for 4 seconds or more, it is determined that no abnormality has occurred in the solar system, but the mixing control valve that serves as a determination criterion The duration time of the fully opened state of 21 is not limited to “4 seconds”, but considering the driving state of the mixing control valve 21 when the hot water temperature stored in the heat storage tank 14 is close to the water temperature Tw. What is necessary is just to set suitably.
[0052]
Further, in the above-described embodiment, when determining abnormality of the water supply system, the duration of the fully closed state of the mixing control valve 21 is not considered, but for example, the water supply temperature Tw can be higher than the target temperature Tt. If there is a possibility, it may be determined that there is an abnormality in the water supply system when the duration of the fully closed state of the mixing control valve 21 is less than a predetermined time.
[0053]
Further, in the above-described embodiment, when the mixing control valve 21 is forcibly fully closed based on an abnormality of the solar system, the normal control state is automatically returned after 4 hours. However, the present invention is not limited to this, and the time for automatically returning the mixing control valve 21 to the normal control state may be set as appropriate in consideration of the usability of the hot water supply system 1. Similarly to the case where the error occurs, the mixing control valve 21 may be returned to the normal control state only when the user consciously resets the operation state.
[0054]
Moreover, although embodiment mentioned above is a hot water supply system which used the solar water heater as an auxiliary heat source, the auxiliary heat source in a hot water supply system is not limited to such a solar water heater, for example, cogeneration Needless to say, the present invention can be applied to a hot water supply system using various auxiliary heat sources, such as a hot water supply system using waste heat of a gas engine or a gas turbine in the system as an auxiliary heat source.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a hot water supply system according to the present invention.
FIG. 2 is a flowchart showing an operation when a system abnormality occurs in the hot water supply system according to the first embodiment.
FIG. 3 is a flowchart showing an operation operation when a system abnormality occurs in the hot water supply system of the above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water supply system 10 Solar water heater 14 Heat storage tank 16 Hot water supply pipe 20 Hot water connection unit 20a Controller 21 Mixing control valve 23 Hot water pipe 26 Hot water temperature sensor 27 Hot water temperature sensor 28 Hot water temperature sensor 30 Hot water heater 30a Controller 31 Heat exchanger 40 operation remote control 40a controller

Claims (5)

A hot water heater as a main heat source, a heat storage tank for storing hot water generated by an auxiliary heat source, and hot water having a target temperature by mixing hot water as needed with the hot water sent from the heat storage tank The mixing control valve is equipped with a hot water supply connection unit mounted with a mixing control valve for sending to the hot water supply device, and the mixing control valve sends only hot water sent from the heat storage tank to the hot water heater when fully opened, and only closes clean water with the fully closed. In a hot water supply system that is designed to be sent to a water heater,
When the temperature of the hot water sent from the hot water supply connection unit when the mixing control valve is performing a hunting operation is equal to or lower than a determination reference temperature obtained by adding a predetermined temperature to the water temperature, the hot water supply from the heat storage tank determines that the delivery a condition not a hot water connection unit,
A hot water supply system characterized in that, when it is determined that hot water cannot be sent from the heat storage tank to the hot water supply connection unit, the mixing control valve is forcibly fully closed. Even when the temperature of the hot water sent from the hot water supply connection unit when the mixing control valve is performing the hunting operation is equal to or lower than a reference temperature obtained by adding a predetermined temperature to the water temperature, the mixing control valve is fully opened. The hot water supply system according to claim 1, wherein when the state is maintained for a predetermined time or longer, it is determined that the hot water can be sent from the heat storage tank to the hot water supply connection unit. After forcibly fully closing the mixing control valve, when the operating state is reset by operating the operation switch of the water heater, or when a predetermined time has passed without resetting the operating state, The hot water supply system according to claim 1 or 2, wherein the mixing control valve is returned to a normal control state. A hot water heater as a main heat source, a heat storage tank for storing hot water generated by an auxiliary heat source, and hot water having a target temperature by mixing hot water as needed with the hot water sent from the heat storage tank The mixing control valve is equipped with a hot water supply connection unit mounted with a mixing control valve for sending to the hot water supply device, and the mixing control valve sends only hot water sent from the heat storage tank to the hot water heater when fully open, In a hot water supply system that is designed to be sent to a water heater,
The temperature of the hot water sent from the heat storage tank is equal to or higher than the target temperature, and the temperature of the hot water sent from the hot water supply connection unit when the mixing control valve is performing the hunting operation is equal to the target temperature. When it is equal to or higher than the added determination reference temperature, it is determined that it is in a state in which water supply cannot be sent to the hot water supply connection unit,
A hot water supply system characterized in that, when it is determined that it is in a state in which clean water cannot be delivered to the hot water supply connection unit, the mixing control valve is forcibly fully closed. After forcibly closing the mixing control valve, the mixing control valve is returned to the normal control state only when the operation state is reset by operating the operation switch of the water heater. The hot water supply system according to claim 4.

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