JP5479559B1 - Hot water system - Google Patents

Abstract

A hot water supply system capable of reliably supplying hot water even when normal cooperation with a combustion water heater cannot be performed.
[Solution]
A tank heater 2 is provided for boiling hot water in the hot water storage tank 4. A combustion water heater 3 is provided for heating the hot water flowing through the hot water discharge pipe 5 for deriving hot water from the hot water storage tank 4. A bypass pipe 19 including a bypass valve 22 is provided in the hot water discharge pipe 5. The tank control means 26 for controlling the bypass valve 22 is provided with a cooperation availability determination means for determining whether normal cooperation with the combustion water heater 3 is possible. The tank control unit 26 opens the bypass valve 22 and determines that the amount of hot water in the hot water storage tank 4 is equal to or greater than a predetermined amount when it is determined by the cooperation availability determination unit that normal cooperation with the combustion water heater 3 is impossible. In this manner, the tank heater 2 is made to boil hot water in the hot water storage tank 4.
[Selection] Figure 1

Description

  The present invention relates to a hot water supply system in which a combustion water heater is connected to a downstream side of a hot water storage tank.

  2. Description of the Related Art Conventionally, there is known a hot water supply system that includes a hot water storage tank that stores hot water boiled by a heater such as a heat pump, and a combustion hot water heater connected in series to the downstream side of the hot water storage tank (see, for example, Patent Document 1). According to this hot water supply system, when hot water runs out in the hot water storage tank and the temperature of the hot water led out from the hot water storage tank decreases, the hot water can be heated up to a desired temperature by the combustion hot water supply.

  However, when a combustion water heater is directly connected to the downstream side of the hot water storage tank, the flow path of hot water from the hot water storage tank to the outlet of the hot water outlet pipe becomes longer, and the distribution path passes through the combustion hot water heater. The heat dissipation in hot water is great.

  Thus, a bypass pipe that bypasses the combustion water heater is provided, and a bypass valve that opens and closes the bypass pipe is provided. According to this, when the hot water tank does not run out, the bypass valve is opened and the hot water in the hot water storage tank is sent to the outlet of the hot water discharge pipe, so that the heat radiation can be reduced.

JP 2000-329401 A

  However, if the hot water tank runs out and the bypass valve is closed and additional heating is performed by the combustion water heater, the combustion water heater will fail or the energization of the combustion water heater will stop. In such a case, additional heating by the combustion hot water heater cannot be performed, and thus the hot water desired by the user cannot be performed.

  Moreover, in recent years, in order to use inexpensive nighttime power, a heat pump is automatically operated at night to perform a boiling operation, and hot water for daytime is stored in a hot water storage tank. In this case, in order to avoid expensive power consumption in the daytime, control is performed to prohibit boiling operation by a heat pump outside the nighttime. The boiling operation cannot be performed.

  As described above, when the hot water tank has run out of water, when the normal cooperation with the combustion water heater cannot be performed, there is a problem that a normal hot water supply desired by the user cannot be performed.

  In view of the above points, an object of the present invention is to provide a hot water supply system that can reliably supply hot water even when normal cooperation with a combustion water heater cannot be performed.

  The present invention relates to a hot water storage tank, a tank heater that boils hot water in the hot water storage tank, a hot water pipe that leads out hot water in the hot water storage tank, and hot water that is interposed in the hot water pipe and flows through the hot water pipe. A combustion hot water heater that is heated by combustion of a burner, a bypass pipe that branches from a hot water outlet pipe between the combustion hot water heater and the hot water storage tank, and is connected to a hot water outlet pipe downstream of the combustion hot water heater; and opens and closes the bypass pipe A bypass valve that detects the amount of hot water in the hot water storage tank, and when the amount of hot water in the hot water storage tank detected by the hot water storage amount detection means is equal to or greater than a predetermined amount, the bypass valve is opened to open the bypass valve. Control that performs hot water supply through a pipe, and closes the bypass valve to flow hot water in the hot water pipe to the combustion water heater when the hot water amount of the hot water storage tank detected by the hot water storage amount detecting means is less than a predetermined amount I do A tank control means, a boiling control means for boiling the hot water in the hot water storage tank by the tank heater in accordance with an instruction from the tank control means, and the combustion hot water supply communicatively connected to the tank control means. In the hot water supply system comprising a hot water heater control means for controlling the operation of the water heater, the tank control means comprises a cooperation availability judgment means for judging whether or not normal cooperation with the combustion water heater is possible. When the determination means determines that normal cooperation with the combustion water heater is impossible, the bypass valve is opened, and the amount of hot water in the hot water storage tank detected by the hot water storage amount detection means is equal to or greater than a predetermined amount. Then, boiling water is heated in the hot water storage tank by the tank heater through the boiling control means.

  The tank control means includes the cooperation availability determination means, so that the combustion water heater can normally cooperate before the hot water amount in the hot water storage tank becomes less than a predetermined amount and the bypass valve is closed. It can be determined whether or not. When it is determined by the cooperation availability determination means that normal cooperation with the combustion water heater is impossible, the tank control means maintains a state where the bypass valve is opened, Do hot water supply. At this time, although the follow-up heating by the combustion water heater cannot be performed, the tank heater is connected via the boiling-up control means so that the amount of hot water in the hot water storage tank detected by the hot water storage amount detection means becomes equal to or greater than a predetermined amount. The hot water boiling in the hot water storage tank is executed, so that hot water can be supplied from the hot water storage tank. Therefore, when normal cooperation with the combustion water heater cannot be performed, the hot water storage tank is prevented from running out of hot water, and hot water can be reliably supplied.

  In the present invention, the cooperation availability determination means depends on whether or not the combustion water heater can perform normal operation, or whether or not the tank control means and the water heater control means can perform normal communication. And determining whether normal cooperation with the combustion water heater is possible.

  The state in which the combustion water heater cannot operate normally includes, for example, a case where the combustion water heater is out of order or a case where the combustion water heater is not energized. The state in which the tank control unit and the water heater control unit cannot perform normal communication is, for example, when the communication line that electrically connects the tank control unit and the water heater control unit is disconnected. The case where the water heater control means is not energized can be considered.

  The cooperation availability determination means can reliably determine whether or not the cooperation is possible based on the state of the combustion water heater or the communication state between the tank control means and the water heater control means.

The block diagram of the hot-water supply system of this invention. The flowchart which shows main operation | movement of a tank controller.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the hot water supply system of the present embodiment includes a tank unit 1, a heat pump 2, and a combustion water heater 3.

  The tank unit 1 includes a hot water storage tank 4 filled with hot water. The upper end of the hot water storage tank 4 is connected to the upstream end of the hot water discharge pipe 5, and the hot water of the hot water storage tank 4 is led out through the hot water discharge pipe 5. A hot water tap such as a curan (not shown) is connected to the downstream end of the hot water pipe 5.

  A water supply pipe 6 is connected to the lower part of the hot water storage tank 4. The upstream end of the water supply pipe 6 is connected to the water supply. The water supply pipe 6 branches in two directions at the branch portion 7, and one downstream end thereof is connected to the hot water storage tank 4. The other downstream end is connected to a junction 8 in the middle of the hot water discharge pipe 5.

  A water supply pipe 6 upstream of the branching section 7 is provided with a first water amount sensor 9 that detects a water flow rate and a water thermistor 10 that detects the temperature of water (tap water) flowing through the water supply pipe 6. Yes.

  A water supply pipe 6 between the branch portion 7 and the hot water storage tank 4 includes a tank-side check valve 11 that prevents a back flow from the hot water storage tank 4 to the water supply pipe 6, and a water supply amount to the hot water storage tank 4 (from the hot water storage tank 4. A second water amount sensor 12 for detecting the amount of hot water derived from the hot water storage tank 4 and a derived hot water amount adjusting valve 13 for controlling the amount of hot water derived from the hot water storage tank 4 are provided.

  The water supply pipe 6 from the branch part 7 to the junction 8 of the hot water pipe 5 has a hot water pipe side check valve 14 for preventing a reverse flow from the hot water pipe 5 to the water supply pipe 6 and the hot water pipe 5 through the junction 8. A mixed water amount adjustment valve 15 is provided for adjusting the temperature of hot water led out from the hot water storage tank 4 by adjusting the amount of incoming water to be joined to the hot water storage tank 4.

  The hot water discharge pipe 5 between the junction 8 and the hot water storage tank 4 is provided with a tank hot water thermistor 16 for detecting the temperature of the hot water led out from the hot water storage tank 4. Is provided with a mixing thermistor 17 for detecting the temperature of hot water after the tap water supplied from the water supply pipe 6 is mixed.

  The hot water discharge pipe 5 extends from the downstream side of the mixing thermistor 17 to the outside of the tank unit 1, passes through a hot water heater circuit 18 to be described later of the combustion hot water heater 3, and then enters the tank unit 1 again. And in the tank unit 1, between the hot water discharge pipe 5 on the side toward the hot water heater circuit 18 and the hot water discharge pipe 5 extending from the downstream side of the hot water heater circuit 18 to the inside of the tank unit 1, the hot water to make the both communicate with each other. A bypass pipe 19 is connected. A bypass valve 22 is provided between the upstream connection portion 20 and the downstream connection portion 21 of the hot water bypass pipe 19. As the bypass valve 22, a valve that can be opened and closed in a stepless manner or in a number of steps from fully open to fully closed is employed.

  When the bypass valve 22 is closed, hot water from the hot water storage tank 4 flows through the hot water heater circuit 18 of the combustion hot water heater 3, and when the bypass valve 22 is opened, hot water from the hot water storage tank 4 flows through the hot water bypass pipe 19. It goes to the tap provided at the end of the pipe 5.

  A hot water supply outlet thermistor 23 that detects the temperature of hot water going to the hot water tap is provided in the hot water discharge pipe 5 on the downstream side of the downstream connection portion 21 of the hot water bypass pipe 19.

  A first hot water storage thermistor 24 that detects the temperature of the hot water stored in the hot water storage tank 4 is provided at an upper position of the hot water storage tank 4. Further, a second hot water storage thermistor 25 is provided at a position below the first hot water storage thermistor 24 of the hot water storage tank 4 at a predetermined distance. The 1st hot water storage thermistor 24 and the 2nd hot water storage thermistor 25 comprise the hot water storage amount detection means of this invention.

  Here, the state of the hot water filled in the hot water storage tank 4 will be described. The hot water discharge pipe 5 is connected to the upper part of the hot water storage tank 4, and the water supply pipe 6 is connected to the lower part of the hot water storage tank 4. For this reason, when the hot water in the hot water storage tank 4 is used for hot water supply, the hot water is led out from the hot water discharge pipe 5 and the hot water in the hot water storage tank 4 is reduced, so that water is supplied from the water supply pipe 6 below the hot water storage tank 4. Accordingly, in the hot water storage tank 4, a hot water layer is formed at the top and a low temperature water layer is formed at the bottom. Further, since the hot water layer and the water layer are in contact with each other vertically, an intermediate layer having a temperature lower than that of the hot water layer and higher than that of the water layer is formed at a contact portion between the hot water layer and the water layer. The temperature of the intermediate layer gradually decreases from the portion in contact with the hot water layer to the portion in contact with the aqueous layer.

  When the hot water layer of the hot water storage tank 4 decreases, the temperature near the outlet of the hot water storage tank 4 to which the hot water discharge pipe 5 is connected decreases. When hot water having a predetermined temperature cannot be obtained from the hot water storage tank 4, the state is generally called hot water exhaustion. When hot water runs out in the hot water storage tank 4, hot water having a low temperature is derived from the hot water storage tank 4.

  The hot water outage state can be determined by the temperature detected by the first hot water storage thermistor 24. Further, whether or not the amount of hot water stored in the hot water storage tank 4 is sufficient can be determined based on the temperature detected by the second hot water storage thermistor 25. That is, if the intermediate layer or the water layer is confirmed by the detected temperature of the first hot water storage thermistor 24, the hot water amount in the hot water storage tank 4 is not stored up to the position of the first hot water storage thermistor 24 (the position where the hot water amount becomes a predetermined amount). If it can be determined that the tank 4 has run out of hot water and a hot water layer is confirmed based on the temperature detected by the second hot water storage thermistor 25, it can be determined that sufficient hot water has been stored in the hot water storage tank 4.

  The tank unit 1 includes a tank controller 26 (tank control means) configured by a microcomputer or the like. The tank controller 26 includes a plurality of operation switches (not shown) such as a temperature switch for setting a desired hot water supply temperature (temperature of hot water coming out of the hot water tap) according to a user's operation. (Hereinafter referred to as remote control) is connected.

  The tank controller 26 executes mixed temperature control control when the hot water layer is confirmed by the temperature detected by the first hot water storage thermistor 24 and no hot water has run out in the hot water storage tank 4.

  In the mixed temperature control, the opening degree of the derived hot water amount adjusting valve 13 and the mixed water amount are adjusted so that the detected temperature of the mixed thermistor 17 or the hot water outlet thermistor 23 becomes the target hot water temperature (the hot water temperature set by the user with the remote controller 27). By controlling the opening degree of the valve 15, the mixing ratio of hot water from the hot water storage tank 4 and water from the water supply pipe 6 is adjusted.

  Further, the tank controller 26 controls the operation of the bypass valve 22 according to whether or not the hot water storage tank 4 is out of hot water, and transmits a signal prohibiting heating or a signal permitting heating to the combustion water heater 3. .

  Further, the tank controller 26 can selectively execute the night boiling mode and the constant boiling mode. The night boiling mode is a mode in which hot water is heated in the hot water storage tank 4 by the heat pump 2 only in a time zone in which the night electricity rate is applied (for example, 8 hours from 23:00 to 7:00). That is, the hot water of the required amount for one day obtained by learning or the total capacity of the hot water storage tank is stored in the hot water storage tank 4 in the time zone when the night electricity rate is applied. When the night boiling mode is selected, the hot water stored in the hot water storage tank 4 is used for hot water supply during the day, and even if the hot water storage tank 4 runs out of hot water, the heat pump 2 heats up the hot water in the hot water storage tank 4 Do not do. When the hot water storage tank 4 runs out of water, the tank controller 26 transmits a signal permitting heating to the combustion water heater 3, closes the bypass valve 22, and performs additional heating by the combustion water heater 3. To be able to

  On the other hand, the constant boiling mode is a mode in which the hot water in the hot water storage tank 4 is heated by the heat pump 2 even during the daytime. That is, when the temperature detected by the first hot water storage thermistor 24 of the hot water storage tank 4 reaches the boiling start temperature (for example, less than 60 ° C.) during daytime hot water supply, the hot water in the hot water storage tank 4 by the heat pump 2 is heated to a predetermined boiling temperature ( For example, the operation of boiling up to 80 ° C. is performed.

  The heat pump 2 is provided as a tank heater according to the present invention. The heat pump 2 includes a refrigerant circulation path 28, which includes a compressor 29, a water heat exchanger (condenser) 30, an expansion valve (decompressor) 31, and an air heat exchanger (evaporator) 32. Is provided.

  The water heat exchanger 30 is connected to a tank circulation path 33 connected to the upper and lower parts of the hot water storage tank 4, and exchanges heat between the refrigerant in the refrigerant circulation path 28 and the hot water in the tank circulation path 33, so that the tank circulation path Heat 33 hot water.

  The tank circulation path 33 includes a circulation pump 34 that forcibly circulates hot water between the hot water storage tank 4 and the water heat exchanger 30, and a downstream that detects the temperature of the hot water from the water heat exchanger 30 toward the hot water storage tank 4. A thermistor 35 and an upstream thermistor 36 for detecting the temperature of hot water from the hot water storage tank 4 toward the water heat exchanger 30 are provided.

  The heat pump 2 includes a heat pump controller 37 (boiling-up control means) configured by a microcomputer or the like. The heat pump controller 37 is connected to the tank controller 26 via the communication line 38, and when the heating instruction signal is received from the tank controller 26, the detected temperature of the upstream thermistor 36 and the downstream thermistor 35 provided in the tank circulation path 33. On the basis of the above, the hot water in the hot water storage tank 4 is boiled to a preset boiling temperature (for example, 80 ° C.).

  As described above, the tank controller 26 selects and executes the night boiling mode and the constant boiling mode, and transmits the heating instruction signal to the heat pump controller 37 according to each mode.

  The combustion water heater 3 employs a known configuration such as a gas water heater. That is, the combustion water heater 3 includes a water heater circuit 18, a burner 39 that burns with fuel gas, and a water heater controller 40 (water heater control means) constituted by a microcomputer or the like. As described above, the water heater circuit 18 is connected to the hot water discharge pipe 5 extending from the tank unit 1, thereby constituting a part of the hot water discharge pipe 5.

  The hot water supply circuit 18 includes a hot water supply heat exchanger 41 heated by a burner 39, a hot water supply bypass pipe 42 that bypasses the hot water supply heat exchanger 41, a flow rate of hot water to the hot water supply heat exchanger 41, and a hot water supply bypass pipe 42. A bypass servo 43 that changes a distribution ratio with the flow rate of hot water and a water amount servo 44 that is a throttle valve that adjusts the flow rate of hot water supplied to the combustion water heater 3 are provided.

  Further, the hot water supply circuit 18 detects a temperature of hot water flowing downstream of the hot water supply bypass pipe 42 and a third water amount sensor 45 that detects the flow rate of hot water supplied to the hot water supply heat exchanger 41 and the hot water supply bypass pipe 42. A hot water heater thermistor 46 is provided.

  The water heater controller 40 is connected to the tank controller 26 via a communication line 47 so as to communicate with each other.

  The water heater controller 40 enters the heating permission state when receiving a signal for instructing heating from the tank controller 26. When the third water amount sensor 45 detects water flow exceeding a predetermined lower limit flow rate, the detected temperature of the water heater thermistor 46 becomes the target hot water temperature (the hot water temperature set by the user with the remote controller 27). In addition, the water heater temperature control control for controlling the combustion amount of the burner 39 is executed.

  Further, when the water heater controller 40 receives a signal for instructing to prohibit heating from the tank controller 26, the water heater controller 40 is in a heating prohibited state, and execution of the water heater temperature control is prohibited.

  Furthermore, when a failure occurs such that the burner 39 cannot burn normally, the water heater controller 40 detects the failure and transmits an error code to the tank controller 26.

  The tank controller 26 includes, as this function, cooperation availability determination means that determines whether normal cooperation between the opening / closing operation with the bypass valve 22 and the combustion water heater 3 is possible. When the tank controller 26 receives the error code transmitted from the water heater controller 40 (when the combustion water heater cannot perform normal operation), the tank controller 26 cooperates with the combustion water heater 3 by the function of the cooperation availability determination means. Is determined to be impossible.

  Further, the tank controller 26 sends a check signal to the water heater controller 40 at the start of transmission of various signals to the water heater controller 40. When a reply from the water heater controller 40 to the check signal cannot be received on the tank controller 26 side, it is impossible to energize the tank controller 26 and the water heater controller 40 due to disconnection of the communication line 47 (normal communication). Therefore, the tank controller 26 determines that the cooperation of the combustion water heater 3 is impossible by the function of the cooperation determination unit.

  When the tank controller 26 determines that the cooperation of the combustion water heater 3 is impossible due to the function of the cooperation determination unit, the tank controller 26 sets the bypass valve 22 to the open state and selects the normal boiling mode.

  Here, the operation | movement which concerns on the summary of this invention by the tank controller 26 is demonstrated with reference to the flowchart of FIG.

  First, when the control operation by the tank controller 26 is started when the power of the tank unit 1 is turned on, the presence or absence of water flow through the water supply pipe 6 is determined in STEP 1 and hot water supply is started by the user (the hot water tap is turned on). Proceed to STEP 2 when the water has passed through (opened). In STEP 1, when the first water amount sensor 9 detects water flow exceeding the lower limit flow rate, water flow is present.

  When proceeding to STEP 2, the tank controller 26 determines whether or not the combustion water heater 3 can be linked by the function of the linkage availability determining means. If it is determined in STEP 2 that the cooperation of the combustion water heater 3 is possible, the process proceeds to STEP 3, and if it is determined that the cooperation is impossible, the process proceeds to STEP 10. When proceeding to STEP 3, the tank controller 26 enters the night boiling mode. When proceeding to STEP 10, the tank controller 26 is always in the boiling mode.

  When proceeding to STEP 3, the tank controller 26 instructs the heat pump 2 to boil up the hot water in the hot water storage tank 4 to the heat pump 2 during the time zone in which the night electricity rate is applied (for example, 8 hours from 23:00 to 7 pm), In the daytime, the heat pump 2 is in a mode of prohibiting its operation.

  When proceeding from STEP 3 to STEP 4, the tank controller 26 determines whether or not the hot water tank 4 has run out. If the hot water tank 4 has run out in STEP 4, the process of STEP 5 to STEP 8 is performed and then the process proceeds to STEP 9. If the hot water tank 4 has not run out in STEP 4, the process of STEP 11 to STEP 14 is performed. After proceeding, proceed to STEP9.

  When the process proceeds to STEP 5 because the hot water tank 4 is out of hot water, the tank controller 26 permits the water heater controller 40 to operate the combustion water heater 3. Next, in STEP 6, the bypass valve 22 is closed, and the process proceeds to STEP 7 to open the water amount servo 44 via the water heater controller 40.

  And in step 8, hot water heater temperature control is executed via the water heater controller 40. With this water heater temperature control, when the third water amount sensor 45 detects water flow exceeding a predetermined lower limit flow rate, the detected temperature of the water heater thermistor 46 is set to the target hot water temperature (set by the user using the remote controller 27). The amount of combustion of the burner 39 is controlled so that the hot water supply temperature is reached. Accordingly, the hot water discharged from the hot water storage tank 4 is additionally heated by the combustion hot water supply device 3 so that hot water can be reliably supplied at a desired temperature even if the hot water storage tank 4 has run out. Can do.

  Thereafter, the tank controller 26 returns to STEP 2 when the stop of hot water supply by the user is not detected in STEP 9, and returns to STEP 1 when the stop of hot water supply by the user is detected. In STEP9, when the water stoppage state in which the first water amount sensor 9 does not detect water flow exceeding the lower limit flow rate, the water stoppage is present.

  Further, since the hot water storage tank 4 has not run out, the tank controller 26 prohibits the water heater controller 40 from operating the combustion water heater 3 when proceeding to STEP 11. Next, in STEP 12, the bypass valve 22 is opened, the process proceeds to STEP 13, and the water amount servo 44 is closed via the water heater controller 40. Accordingly, the hot water (hot water having a sufficient temperature in this case) derived from the hot water storage tank 4 is reliably blocked from flowing into the hot water supply circuit 18 and passes through the hot water bypass pipe 19.

  And the tank controller 26 performs mixing temperature control control by STEP14. By the mixed temperature control, the opening degree of the outlet hot water adjustment valve 13 and the mixed water amount adjustment are performed so that the detected temperature of the mixed thermistor 17 or the hot water outlet thermistor 23 becomes the target hot water temperature (the hot water temperature set by the user with the remote controller 27). The opening degree of the valve 15 is controlled. Thereby, the mixing ratio of the hot water from the hot water storage tank 4 and the water from the water supply pipe 6 is adjusted, and hot water can be reliably supplied at a desired temperature.

  Thereafter, the tank controller 26 proceeds to STEP9. In STEP 9, as described above, if there is no water stop, the process returns to STEP 2. If there is water stop, the process returns to STEP 1.

  Further, when it is determined in STEP 2 that the combustion water heater 3 cannot be linked, and the process proceeds to STEP 10, the tank controller 26 uses hot water in the hot water storage tank 4 by the heat pump 2 even during daytime. It becomes the mode to perform the boiling-up operation. As a result, the temperature detected by the first hot water storage thermistor 24 of the hot water storage tank 4 is constantly maintained at the boiling temperature (that is, the hot water amount of the hot water storage tank 4 is maintained at a predetermined amount or more). Does not occur. That is, when STEP 10 is passed, the processing of STEP 11 to STEP 14 is always the operation in the boiling mode.

  Then, the tank controller 26 prohibits the water heater controller 40 from operating the combustion water heater 3 in STEP 11, opens the bypass valve 22 in STEP 12, and closes the water amount servo 44 via the water heater controller 40 in STEP 13. Let me speak.

  For example, when the tank controller 26 and the water heater controller 40 cannot communicate with each other because of passing through STEP 10, the water heater controller 40 receives signals from the tank controller 26 regarding the processing of STEP 11 and the processing of STEP 13. It is not possible. However, when the tank controller 26 and the water heater controller 40 can communicate with each other and only the combustion operation by the burner 39 of the combustion water heater 3 is hindered, the processing of STEP 11 and STEP 13 is possible. Then, by closing the water amount servo 44 of the combustion water heater 3 in STEP 13, the flow of hot water to the water heater circuit 18 can be shut off, and the hot water from the hot water storage tank 4 is reliably passed through the hot water bypass pipe 19. Can be sent to the tap.

  Next, the mixing temperature adjustment control is executed in STEP14, and the process proceeds to STEP9. In STEP 9, as described above, if there is no water stop, the process returns to STEP 2. If there is water stop, the process returns to STEP 1.

  As described above, when the combustion water heater 3 cannot be normally linked due to a failure or the like, the tank controller 26 is always heated until the combustion water heater 3 is repaired or the like and the normal cooperation is possible. The processing of STEP11 to STEP14 is performed in the mode (STEP10). Thereby, even if normal cooperation with the combustion water heater 3 is impossible, the boiling operation by the heat pump 2 is always performed, and the hot water storage tank 4 does not run out of the hot water, and at the temperature desired by the user. Hot water can be supplied smoothly.

  In addition, while performing the process of STEP11-STEP14 at the time of passing through STEP10, the heating-up operation of the heat pump 2 is performed even in the time zone when a night electricity rate is not applied, but cooperation of the combustion water heater 3 is not performed in STEP2. It is only when it is determined that it is possible. For this reason, if cooperation with the combustion water heater 3 becomes possible, for example, by repairing the combustion water heater 3, the night boiling mode is selected in STEP 2, and therefore the normal boiling mode is selected in STEP 2. The power consumption due to the operation of the heat pump 2 can be minimized.

  In addition, in this embodiment, although the example which employ | adopted the heat pump 2 as a tank heater was shown, it is not restricted to this, For example, simple heaters, such as a solar water heater, are also employable.

  2 ... Heat pump (tank heater), 3 ... Combustion water heater, 4 ... Hot water storage tank, 5 ... Hot water pipe, 19 ... Hot water bypass pipe (bypass pipe), 22 ... Bypass valve, 24 ... First hot water storage thermistor (hot water storage amount) Detection means), 26 ... Tank controller (tank control means), 37 ... Heat pump controller (boiling control means), 39 ... Burner, 40 ... Water heater controller (water heater control means).

Claims (3)

A hot water storage tank,
A tank heater for boiling the hot water in the hot water storage tank;
A tapping pipe for deriving hot water from the hot water storage tank;
A combustion water heater that is interposed in the tapping pipe and heats hot water flowing through the tapping pipe by combustion of a burner;
A bypass pipe branched from a hot water pipe between the combustion water heater and the hot water storage tank and connected to a hot water pipe downstream of the combustion water heater;
A bypass valve for opening and closing the bypass pipe;
Hot water storage amount detecting means for detecting the hot water storage amount of the hot water storage tank;
When the amount of hot water in the hot water storage tank detected by the hot water storage amount detection means is a predetermined amount or more, the bypass valve is opened to supply hot water via the bypass pipe, and the hot water storage detected by the hot water storage amount detection means When the amount of hot water in the tank is less than a predetermined amount, tank control means for controlling the flow of the hot water in the hot water pipe to the combustion water heater by closing the bypass valve;
Boiling control means for performing boiling of hot water in the hot water storage tank by the tank heater according to an instruction from the tank control means;
In a hot water supply system comprising hot water heater control means connected to the tank control means so as to be communicable and controlling operation of the combustion water heater,
The tank control unit includes a link availability determination unit that determines whether or not normal cooperation with the combustion water heater is possible, and normal cooperation with the combustion water heater is impossible by the link availability determination unit. When it is determined, the tank heater is opened via the boiling-up control means so that the bypass valve is opened and the amount of hot water in the hot water storage tank detected by the hot water storage amount detection means is equal to or greater than a predetermined amount. A hot water supply system that performs boiling of hot water in a hot water storage tank. The hot water supply system according to claim 1,
The hot water supply system according to claim 1, wherein the cooperation availability determination unit determines whether normal cooperation with the combustion water heater is possible depending on whether the combustion water heater can perform a normal operation. In the hot water supply system according to claim 1 or 2,
The cooperation availability determination means determines whether normal cooperation with the combustion water heater is possible depending on whether the tank control means and the water heater control means can perform normal communication. Hot water supply system.

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