JP6565704B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type water heater.

  The hybrid hot water supply system disclosed in the following Patent Document 1 includes a hot water storage tank for storing hot water heated by a low-speed heater, a hot water path for discharging hot water from the hot water storage tank, and tap water for mixing that joins the hot water path. A mixing ratio adjuster that adjusts the ratio of the path, the amount of hot water flowing through the hot water path and the amount of cold water flowing through the mixing tap water path, a mixed hot water path that leads the mixed hot water that has passed through the mixing ratio adjuster to the hot water tap, and hot water A rapid heater for heating water flowing through the channel or the mixed hot water channel.

JP 2011-231950 A

  The hot water stored in the hot water storage tank may have a residual chlorine concentration lower than that of tap water due to heating. In a hot water storage type hot water heater that generates hot water to be supplied to a second hot water heater (corresponding to the rapid heater in Patent Document 1), medium hot water that has been radiated without being used after being heated once is stored in the hot water storage tank for a long time. May stay. Since the intermediate temperature water is concerned about a decrease in residual chlorine concentration, it is not desirable in terms of water quality to stay in the hot water storage tank for a long time.

  The present invention has been made to solve the above-described problems, and suppresses hot water from staying in a hot water storage tank for a long time in a hot water storage water heater that generates hot water supplied to a second hot water heater. The purpose is to do.

A hot water storage type hot water supply apparatus according to the present invention is a hot water storage type hot water supply apparatus that generates hot water to be supplied to a second hot water supply apparatus, comprising a hot water storage tank, heating means for heating water, and hot water heated by the heating means. Boiling control means for controlling the boiling operation accumulated in the hot water storage tank, mixing means capable of mixing hot water supplied from the hot water discharge pipe connected to the upper part of the hot water storage tank, and water supplied from the water supply pipe, and mixing means The supply pipe that supplies the hot water downstream of the hot water to the flow path connected to the second water heater, the means for detecting whether or not the hot water in the hot water storage tank is used up, and the hot water in the hot water storage tank are used up And a means for prohibiting boiling operation until the time when the hot water storage tank is used up in the unit period, the boiling control means accumulates in the hot water storage tank in the next boiling operation. The amount of heat generated by the previous boiling operation Is to shall smaller than the amount of heat accumulated in the hot water tank.
The hot water storage type water heater according to the present invention is a hot water storage type hot water generator that generates hot water to be supplied to the second hot water heater, and is heated by a hot water storage tank, heating means for heating water, and heating means. Boiling control means for controlling boiling operation for accumulating hot water in a hot water storage tank, mixing means capable of mixing hot water supplied from a hot water outlet pipe connected to the upper part of the hot water storage tank, and water supplied from a water supply pipe, Supply pipe that supplies hot water downstream of the mixing means to the flow path connected to the second hot water supply device, means for detecting whether or not the hot water in the hot water storage tank is used up, and hot water in the hot water storage tank is used up If the amount of water supplied from the hot water storage water heater to the second water heater is large compared to the standard when the hot water in the hot water storage tank is used up, The boiling control means is the hot water storage tank in the next boiling operation. The amount of heat accumulated in is for many in comparison to the amount of heat accumulated in the hot water storage tank in the previous boiling up operation.
The hot water storage type water heater according to the present invention is a hot water storage type hot water generator that generates hot water to be supplied to the second hot water heater, and is heated by a hot water storage tank, heating means for heating water, and heating means. Boiling control means for controlling boiling operation for accumulating hot water in a hot water storage tank, mixing means capable of mixing hot water supplied from a hot water outlet pipe connected to the upper part of the hot water storage tank, and water supplied from a water supply pipe, Supply pipe that supplies hot water downstream of the mixing means to the flow path connected to the second hot water supply device, means for detecting whether or not the hot water in the hot water storage tank is used up, and hot water in the hot water storage tank is used up A means for prohibiting boiling operation until a state is reached, a means for controlling the mixing means so that the temperature of the hot water flowing in the supply pipe becomes equal to the target temperature, and a means for periodically changing the target temperature It is.
The hot water storage type water heater according to the present invention is a hot water storage type hot water generator that generates hot water to be supplied to the second hot water heater, and is heated by a hot water storage tank, heating means for heating water, and heating means. Boiling control means for controlling boiling operation for accumulating hot water in a hot water storage tank, mixing means capable of mixing hot water supplied from a hot water outlet pipe connected to the upper part of the hot water storage tank, and water supplied from a water supply pipe, Supply pipe that supplies hot water downstream of the mixing means to the flow path connected to the second hot water supply device, means for detecting whether or not the hot water in the hot water storage tank is used up, and hot water in the hot water storage tank is used up Means for prohibiting the boiling operation until it reaches a state, and when the unit period has elapsed since the previous boiling operation, the boiling control means accumulated in the hot water storage tank in the previous boiling operation. Hot water with a temperature higher than the hot water temperature is stored in the hot water storage tank. It is to implement the boiling-up operation to the product.
The hot water storage type water heater according to the present invention is a hot water storage type hot water generator that generates hot water to be supplied to the second hot water heater, and is heated by a hot water storage tank, heating means for heating water, and heating means. Boiling control means for controlling boiling operation for accumulating hot water in a hot water storage tank, mixing means capable of mixing hot water supplied from a hot water outlet pipe connected to the upper part of the hot water storage tank, and water supplied from a water supply pipe, Supply pipe that supplies hot water downstream of the mixing means to the flow path connected to the second hot water supply device, means for detecting whether or not the hot water in the hot water storage tank is used up, and hot water in the hot water storage tank is used up And a means for prohibiting the boiling operation until a state is reached, and the water in the hot water storage tank is supplied to the second water heater even after the hot water in the hot water storage tank is used up.

  ADVANTAGE OF THE INVENTION According to this invention, in the hot water storage type water heater which produces | generates the warm water supplied to a 2nd water heater, it becomes possible to suppress that hot water retains in a hot water storage tank for a long time.

It is a figure which shows the hot water storage type water heater of Embodiment 1. FIG. 3 is a flowchart of a control routine that is executed in the hot water storage type hot water supply apparatus of the first embodiment. 3 is a flowchart of a control routine that is executed in the hot water storage type hot water supply apparatus of the first embodiment. 3 is a flowchart of a control routine that is executed in the hot water storage type hot water supply apparatus of the first embodiment. 5 is a flowchart of a control routine executed in the hot water storage type hot water supply apparatus according to the second embodiment. 5 is a flowchart of a control routine executed in the hot water storage type hot water supply apparatus according to the second embodiment. 10 is a flowchart of a control routine executed in the hot water storage type hot water supply apparatus according to the third embodiment. 10 is a flowchart of a control routine executed in the hot water storage type hot water supply apparatus according to the third embodiment. It is a figure which shows the example of the hardware constitutions of the control apparatus with which the hot water storage type water heater of Embodiment 1 to 3 is provided. It is a figure which shows the other example of the hardware constitutions of the control apparatus with which the hot water storage type water heater of Embodiment 1 to 3 is provided.

  Hereinafter, embodiments will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals, and redundant description is simplified or omitted. Note that the number, arrangement, orientation, shape, and size of devices, instruments, components, and the like in the present disclosure are not limited to the number, arrangement, orientation, shape, and size shown in the drawings in principle. In addition, the present disclosure may include all combinations of configurations that can be combined among the configurations described in the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a hot water storage type hot water supply apparatus according to a first embodiment. The hot water storage type hot water heater 1 of the first embodiment generates hot water to be supplied to the gas water heater 500. The hot water supplied from the hot water storage type hot water heater 1 to the gas water heater 500 is reheated by the gas water heater 500 and then sent to a hot water supply terminal such as a bathtub 600 or a hot water outlet. The gas water heater 500 is an example of a second water heater. The second water heater is not limited to the gas water heater 500. The 2nd water heater should just be what heats water by methods other than a heat pump type.

  The hot water storage type water heater 1 includes a tank unit 100, a heat pump heat source device 200, a control device 300, and a supply temperature setting unit 400. The heat pump heat source apparatus 200 is an example of a heating unit that heats water. The heat pump heat source device 200 includes a refrigerant circuit. Although not shown, the refrigerant circuit includes a compressor that compresses the refrigerant, a water refrigerant heat exchanger, a decompression device such as an expansion valve, and a low-temperature heat source such as outside air and the refrigerant to exchange heat. Including an evaporator.

  The tank unit 100 includes a hot water storage tank 101 that stores hot water heated by the heat pump heat source apparatus 200. Inside the hot water storage tank 101, a temperature stratification can be formed in which the upper side is a high temperature and the lower side is a low temperature due to the difference in water density depending on the temperature. The hot water storage tank 101 may have a volume of 200 L, for example. The hot water storage tank 101 desirably has a capacity capable of storing an amount of hot water having an amount of heat to be supplied to the gas water heater 500 in the first unit period (for example, one day).

  The lower part of the hot water storage tank 101 and the water inlet of the heat pump heat source apparatus 200 are connected via the forward flow path 2. A circulation pump 102 is arranged in the middle of the outgoing flow path 2. The water outlet of the heat pump heat source device 200 and the upper part of the hot water storage tank 101 are connected via the return flow path 3. In the boiling operation of the hot water storage type water heater 1, the operation is as follows. The heat pump heat source device 200 and the circulation pump 102 are operated. Low-temperature water in the lower part of the hot water storage tank 101 is sent to the heat pump heat source device 200 through the forward flow path 2. Hot water heated by the heat pump heat source device 200 flows into the upper part of the hot water storage tank 101 through the return channel 3. Hot water is accumulated in the hot water storage tank 101 from the upper side to the lower side. In the following description, the temperature of hot water after being heated by the heat pump heat source apparatus 200 during the boiling operation is referred to as “boiling temperature”.

  The water supply pipe 4 supplies water from a water source such as a water supply. A pressure reducing valve 105 that adjusts the water pressure acting from the water source to a predetermined pressure is disposed in the middle of the water supply pipe 4. The water supply pipe 4 branches on the downstream side of the pressure reducing valve 105, and is connected to the lower part of the hot water storage tank 101 and the first inlet of the mixing valve 106. Water from the water source is supplied to the lower part of the hot water storage tank 101 and the first inlet of the mixing valve 106 through the water supply pipe 4. When water flows into the hot water storage tank 101 from the water supply pipe 4, the hot water storage tank 101 can be maintained in a full water state. The hot water discharge pipe 5 connects between the upper part of the hot water storage tank 101 and the second inlet of the mixing valve 106.

  The upstream end of the supply pipe 6 is connected to the outlet of the mixing valve 106. The downstream end of the supply pipe 6 is connected to an external pipe 7 that extends to the outside of the tank unit 100. The mixing valve 106 is an example of mixing means capable of mixing hot water supplied from the upper part of the hot water storage tank 101 through the hot water discharge pipe 5 and water supplied from the water supply pipe 4. The mixing valve 106 can adjust the mixing ratio of hot water from the hot water discharge pipe 5 and water from the water supply pipe 4. Hot water generated by mixing the hot water from the tap water pipe 5 and the water from the water supply pipe 4 by the mixing valve 106 is supplied to the water inlet of the gas water heater 500 through the supply pipe 6 and the external pipe 7. The

  An upper temperature sensor 103 and a lower temperature sensor 104 are attached to the hot water storage tank 101. The upper temperature sensor 103 detects an upper water temperature in the hot water storage tank 101 (hereinafter referred to as “tank upper temperature”). The lower temperature sensor 104 detects the water temperature in the lower part of the hot water storage tank 101 (hereinafter referred to as “tank lower temperature”).

  A supply temperature sensor 107 and a flow rate sensor 108 are attached to the supply pipe 6. The supply temperature sensor 107 detects the supply temperature. The supply temperature is the temperature of water in the supply pipe 6, that is, the temperature of hot water supplied from the hot water storage type hot water heater 1. The flow sensor 108 detects the flow rate of water flowing through the supply pipe 6. A water supply temperature sensor 109 is attached to the water supply pipe 4. The water supply temperature sensor 109 detects the water temperature in the water supply pipe 4, that is, the temperature of the water supplied from the water source. A boiling temperature sensor 110 that detects the boiling temperature is attached to the return flow path 3.

  The control device 300 controls operations of the heat pump heat source device 200, the circulation pump 102, and the mixing valve 106. Signals detected by the sensors described above are input to the control device 300. Supply temperature setting unit 400 is connected to control device 300 so as to communicate with each other. The user can set the supply temperature by operating the supply temperature setting unit 400. The set value of the supply temperature input to the supply temperature setting unit 400, that is, information related to the target supply temperature Ths is transmitted to the control device 300.

  In the present embodiment, the presence or absence of a water flow in the supply pipe 6 can be detected based on the signal from the flow sensor 108. When the flow sensor 108 detects the presence of water flow in the supply pipe 6, the control device 300 determines that the supply temperature Th detected by the supply temperature sensor 107 is the target supply temperature Ths set by the supply temperature setting unit 400. To control the operation of the mixing valve 106.

  The target supply temperature Ths may be 30 ° C., for example. The target supply temperature Ths is a temperature that requires reheating by the gas water heater 500. That is, the target supply temperature Ths is set to a temperature lower than the temperature of hot water (for example, 45 ° C.) supplied from the gas water heater 500 to the bathtub 600 or the hot water outlet.

  The control device 300 includes a boiling operation control unit that controls the boiling operation, and a time measuring unit that recognizes time and date. At the time of boiling operation, the control device 300 causes the boiling temperature detected by the boiling temperature sensor 110 to be equal to the target boiling temperature Tp, one or both of the heat pump heat source device 200 and the circulation pump 102. To control. The target boiling temperature Tp may be 65 ° C., for example. The target boiling temperature Tp is preferably a temperature at which bacterial growth can be suppressed. By setting the target boiling temperature Tp to a temperature that can suppress the growth of bacteria, it is possible to more reliably suppress the growth of bacteria in the hot water stored in the hot water storage tank 101. When performing the boiling operation, the control device 300 may control the hot water storage tank 101 to be filled with hot water. By filling the hot water storage tank 101 with hot water, it is possible to more reliably suppress the middle temperature water from remaining in the hot water storage tank 101, and thus it is possible to more reliably prevent bacteria from breeding in the hot water storage tank 101.

  FIG. 2 is a flowchart of a control routine executed in hot water storage type water heater 1 of the first embodiment. The process starts from step S400 of FIG. The process proceeds from step S400 to step S401. In step S401, control device 300 determines whether or not three days have elapsed since the previous boiling operation. When three days have passed since the previous boiling operation, the process proceeds from step S401 to step S407. In step S407, the control device 300 starts operation of the heat pump heat source device 200 and the circulation pump 102, that is, starts boiling operation. On the other hand, when three days have not yet elapsed since the previous boiling operation, the process proceeds from step S401 to step S402.

  In step S402, control device 300 determines whether or not the current time is included in the specific time zone. The specific time zone is a time zone in which the economic merit is large, for example, the unit price of the electric power charge borne by the user is cheaper than other time zones. For example, the time zone from 23:00 to 7:00 in the next morning in a general lighting contract by time zone corresponds to the specific time zone. When the current time is included in the specific time zone, the process proceeds from step S402 to step S406. On the other hand, when the current time is not included in the specific time zone, the process proceeds from step S402 to step S403.

  In step S403, the control device 300 determines whether or not there is a water flow in the supply pipe 6. For example, when there is no water flow in the supply pipe 6, such as when the supply flow rate Flw detected by the flow sensor 108 is substantially 0 L / min, the process returns from step S403 to step S401. On the other hand, when there is a water flow in the supply pipe 6 such as when the supply flow rate Flw detected by the flow rate sensor 108 is greater than 0 L / min, the process proceeds from step S403 to step S404.

  In step S404, the control device 300 determines the opening degree of the mixing valve 106 as follows. If the opening on the hot water side of the mixing valve 106, that is, the opening on the second inlet side connected to the hot water discharge pipe 5, is larger than the reference opening Step, the process proceeds from step S404 to step S405. If the hot water side opening of the mixing valve 106 is smaller than the reference opening Step, the process returns from Step S404 to Step S401. The reference opening Step may be a value at which the opening on the hot water side of the mixing valve 106 is equal to or larger than the opening on the water side, that is, the opening on the first inlet connected to the water supply pipe 4.

  In step S405, the control device 300 uses the first reference value Ts1 as the temperature difference (Th−Tb) between the supply temperature Th detected by the supply temperature sensor 107 and the tank lower temperature Tb detected by the lower temperature sensor 104. Compare with The first reference value Ts1 is a temperature for determining whether or not the supply temperature Th can be regarded as substantially equivalent to the tank lower part temperature Tb. In the following description, “substantially equivalent” is referred to as substantially equivalent. The first reference value Ts1 may be 5 ° C., for example. When the temperature difference (Th−Tb) is smaller than the first reference value Ts1, that is, when the supply temperature Th can be regarded as substantially equal to the tank lower part temperature Tb, the process proceeds from step S405 to step S406. On the other hand, when the temperature difference (Th−Tb) is equal to or greater than the first reference value Ts1, that is, when the supply temperature Th can be considered to be higher than a substantially equivalent range as compared to the tank lower temperature Tb, The process proceeds from step S405 to step S408.

  In step S406, the control device 300 determines the value (Tp−Tstp) obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (for example, 65 ° C.), and the tank lower temperature Tb detected by the lower temperature sensor 104. Compare The boiling start reference value Tstp is a value larger than the first reference value Ts1. The boiling start reference value Tstp may be 10 ° C., for example. When the tank lower temperature Tb is lower than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S406 to step S407. On the other hand, when the tank lower temperature Tb is equal to or higher than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S406 to step S408.

  In step S407, the control device 300 starts operation of the heat pump heat source device 200 and the circulation pump 102, that is, starts boiling operation. The process returns from step S407 to step S401.

  In step S408, the control device 300 stops the heat pump heat source apparatus 200 and the circulation pump 102, that is, does not perform the boiling operation.

  In the present embodiment, it is possible to detect whether or not the hot water in the hot water storage tank 101 is used up by the processes in steps S403, S404, and S405 described above. “The state in which the hot water in the hot water storage tank 101 is used up” is a state in which the inside of the hot water storage tank 101 is filled with low-temperature water supplied from the water supply pipe 4. When the presence of water flow in the supply pipe 6 is detected in step S403, and the hot water side opening of the mixing valve 106 is larger than the reference opening Step in step S404, the hot water pipe 5 is discharged from the upper part of the hot water storage tank 101. It can be determined that there is a water flow to the supply pipe 6. In this state, when the supply temperature Th that is the water temperature in the supply pipe 6 is substantially equal to the tank lower temperature Tb in step S405, the low temperature water is filled up to the upper part of the hot water storage tank 101. That is, it can be considered that the hot water in the hot water storage tank 101 is used up.

  In the present embodiment, in a time zone other than the specific time zone (for example, from 7 o'clock to 23 o'clock), the process proceeds from step S405 to step S408 until the hot water in the hot water storage tank 101 is used up. Therefore, boiling operation is prohibited. For this reason, the hot water stored in the hot water storage tank 101 can be used up. As a result, medium temperature water that has been heated once by the heat pump heat source apparatus 200 and that has been reduced in temperature, that is, medium temperature water that may have decreased residual chlorine concentration due to heating, is prevented from staying in the hot water storage tank 101 for a long time. it can. Therefore, the deterioration of the water quality in the hot water storage tank 101 can be reliably prevented. In step S405, the water supply temperature detected by the water supply temperature sensor 109 may be used instead of the tank lower part temperature Tb.

  In this embodiment, in principle, the boiling operation is performed with a period of one day. One day in the present embodiment is an example of a “first unit period”. In addition, 3 days in the present embodiment is an example of “second unit period”. The second unit period is a period longer than the first unit period. This three days, that is, the second unit period, assumes a remaining period of hot water in the hot water storage tank 101 when no hot water is supplied due to, for example, the absence of a user, and radiates heat when the outside air temperature is high such as in summer. Even when the temperature drop due to is small, it is assumed that the residual chlorine concentration is lowered with the passage of time.

  In the present embodiment, when three days (second unit period) have elapsed since the previous boiling operation was performed in step S401, the process proceeds to step S407 and the boiling operation is performed. This boiling operation is performed so that the inside of the hot water storage tank 101 is filled with hot water. Thereby, the medium temperature water in the hot water storage tank 101 in which the residual chlorine concentration may be lowered is reheated to the target boiling temperature Tp (for example, 65 ° C.). Therefore, the propagation of bacteria in the hot water storage tank 101 can be more reliably suppressed, and the water quality can be maintained well.

  In the present embodiment, water is supplied from the hot water storage tank 101 to the gas water heater 500 through the hot water discharge pipe 5 even after the hot water in the hot water storage tank 101 is used up. That is, even when the supply temperature Th detected by the supply temperature sensor 107 is lower than the target supply temperature Ths, the water supply from the hot water storage tank 101 to the gas water heater 500 is continued without stopping. By doing in this way, since the inside of the hot water storage tank 101 can be filled with fresh water supplied from the water supply pipe 4, the water quality inside the hot water storage tank 101 can be maintained better. The water supplied from the hot water storage tank 101 to the gas water heater 500 is heated by the gas water heater 500. The gas water heater 500 has a hot water supply temperature adjustment function. Even when water having a temperature lower than the target supply temperature Ths is supplied to the gas water heater 500, the hot water supply temperature to the bathtub 600 or the hot water outlet can be maintained by the hot water supply temperature adjustment function of the gas water heater 500.

  FIG. 3 is a flowchart of a control routine executed in hot water storage type water heater 1 of the first embodiment. The process starts from step S700 of FIG. The process moves from step S700 to step S701. In step S701, the controller 300 compares the value (Tp−Tstp) obtained by subtracting the boiling start reference value Tstp (eg, 10 ° C.) from the target boiling temperature Tp (eg, 65 ° C.) with the tank lower temperature Tb. . If the tank lower temperature Tb is lower than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S701 to step S702. On the other hand, when the tank lower temperature Tb is equal to or higher than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S701 to step S706. In step S706, the integrated supply amount Le is initialized to zero.

  In step S702, it is determined whether or not the value of the supply flow rate Flw detected by the flow rate sensor 108 is greater than 0 L / min. If the value of the supply flow rate Flw is greater than 0 L / min, the process proceeds from step S702 to step S703. When the value of the supply flow rate Flw is 0 L / min or less, the process returns from step S702 to step S701.

  In step S703, it is determined whether the hot water side opening of the mixing valve 106 is larger than the reference opening Step. When the opening degree of the hot water side of the mixing valve 106 is larger than the reference opening degree Step, the process proceeds from step S703 to step S704. If the hot water side opening of the mixing valve 106 is smaller than the reference opening Step, the process returns from Step S703 to Step S701.

  In step S704, the temperature difference (Th−Tb) between the supply temperature Th detected by the supply temperature sensor 107 and the tank lower temperature Tb detected by the lower temperature sensor 104 is compared with the first reference value Ts1. When the temperature difference (Th−Tb) is smaller than the first reference value Ts1, that is, when it can be considered that the hot water in the hot water storage tank 101 is used up, the process proceeds from step S704 to step S705. On the other hand, if the temperature difference (Th−Tb) is equal to or greater than the first reference value Ts1, that is, if the hot water in the hot water storage tank 101 has not been used up yet, the process returns from step S704 to step S701.

  In step S705, the supply flow rate Flw is added to the integrated supply amount Le. The process returns from step S705 to step S701.

  According to the processing of the flowchart of FIG. 3 described above, the total amount of water supplied from the hot water storage type hot water heater 1 to the gas water heater 500 with the hot water in the hot water storage tank 101 used up can be detected as the integrated supply amount Le.

  FIG. 4 is a flowchart of a control routine executed in hot water storage type water heater 1 of the first embodiment. The process starts from step S1000 in FIG. The process proceeds from step S1000 to step S1001. In step S1001, it is determined whether or not three days have elapsed since the previous boiling operation. When three days have passed since the previous boiling operation, the process proceeds from step S1001 to step S1004. If three days have not yet elapsed since the previous boiling operation, the process proceeds from step S1001 to step S1002.

  In step S1002, it is determined whether or not the cumulative supply amount Le is greater than 0L. If the integrated supply amount Le is greater than 0L, the process proceeds from step S1002 to step S1003. When the integrated supply amount Le is 0 L, the process proceeds from step S1002 to step S1007.

  In step S1003, the integrated supply amount Le is compared with the reference value Ls. The reference value Ls may be 10L, for example. When the integrated supply amount Le is larger than the reference value Ls, the process proceeds from step S1003 to step S1005. When the integrated supply amount Le is equal to or less than the reference value Ls, the process proceeds from step S1003 to step S1006.

  The reference value Ls may be determined as follows, for example. The target supply temperature Ths is assumed to be 30 ° C. Assume that the feed water temperature is 10 ° C. It is assumed that the capacity of the hot water storage tank 101 is 200L. When the boiling temperature changes by 1 ° C., it corresponds to a hot water supply amount of about 200 L × 1 ° C. ÷ (30 ° C.-10 ° C.) = 10 L.

  In step S1004, a value obtained by adding 10 ° C. to the current target boiling temperature Tp is compared with a predetermined temperature of 65 ° C., and the higher value is set as the next target boiling temperature Tp. Update to Thereafter, the process proceeds to step S1008, and the process ends.

  In step S1005, the value obtained by adding the correction value ΔTi to the current target boiling temperature Tp is updated to be the next target boiling temperature Tp. The correction value ΔTi may be 1 ° C., for example. Thereafter, the process proceeds to step S1008, and the process ends.

  In step S1006, a value equal to the current target boiling temperature Tp is set as the next target boiling temperature Tp. That is, in step S1006, the target boiling temperature Tp is not changed. Thereafter, the process proceeds to step S1008, and the process ends.

  In step S1007, the value obtained by subtracting the correction value ΔTd from the current target boiling temperature Tp is updated so as to be the next target boiling temperature Tp. The correction value ΔTd may be 1 ° C., for example. Thereafter, the process proceeds to step S1008, and the process ends.

  In the present embodiment, the following effects can be obtained by determining the target boiling temperature Tp by the processing of the flowchart of FIG. 4 described above.

  Within 3 days from the previous boiling operation, based on the integrated supply amount Le, which is the total amount of water supplied from the hot water storage water heater 1 to the gas water heater 500 with the hot water in the hot water storage tank 101 used up. The target boiling temperature Tp for the next boiling operation is determined as follows. When the integrated supply amount Le is 0 L, it is considered that the hot water in the hot water storage tank 101 has not been used up for the past three days, that is, in the second unit period. In this case, it is considered that the amount of heat accumulated in the hot water storage tank 101 in the previous boiling operation is too much compared to the required amount. In this case, in step S1007, the next target boiling temperature Tp is set to a value lower than the current target boiling temperature Tp. As a result, the amount of heat accumulated in the hot water storage tank 101 in the next boiling operation is smaller than the amount of heat accumulated in the hot water storage tank 101 in the previous boiling operation. Therefore, it is possible to prompt the exhaustion of the hot water accumulated in the hot water storage tank 101 in the next boiling operation. On the other hand, when the integrated supply amount Le is greater than the reference value Ls, it is considered that the amount of heat accumulated in the hot water storage tank 101 in the previous boiling operation is too small compared to the required amount. Therefore, if the integrated supply amount Le is greater than the reference value Ls, the next target boiling temperature Tp is set to a value higher than the current target boiling temperature Tp in step S1005. Thereby, it is possible to prevent the amount of heat accumulated in the hot water storage tank 101 from becoming excessive in the next boiling operation. When the integrated supply amount Le is greater than 0L and less than or equal to the reference value Ls, it is considered that the amount of heat accumulated in the hot water storage tank 101 in the previous boiling operation is an appropriate amount. In this case, by setting the value equal to the current target boiling temperature Tp to the next target boiling temperature Tp in step S1006, the amount of heat accumulated in the hot water storage tank 101 in the next boiling operation can be made appropriate. .

  On the other hand, when three days (second unit period) have elapsed since the previous boiling operation, in step S1004, the current target boiling temperature Tp is added to 10 ° C. and a predetermined temperature. Compared with a certain 65 ° C., the higher value is set as the target boiling temperature Tp. In this case, the boiling operation is performed by moving from step S401 to step S407 in FIG. By setting the target boiling temperature Tp as described above during the boiling operation, hot water having a temperature higher than the temperature of the hot water stored in the hot water storage tank 101 in the previous boiling operation can be stored in the hot water storage tank 101. As a result, the propagation of bacteria in the hot water storage tank 101 can be more reliably suppressed, and the water quality can be maintained satisfactorily. The reason for using “the value obtained by adding 10 ° C. to the current target boiling temperature Tp” in step S1004 is as follows. If the boiling operation has not been performed for three days, the tank lower temperature Tb may satisfy the boiling operation stop condition in step S406 of FIG. For this reason, 10 ° C., which is the same value as Tstp, is added to the current target boiling temperature Tp so that the boiling operation stop condition is not satisfied.

  Assuming that water from a water source such as a water supply is directly supplied to the gas water heater 500, the temperature of water entering the gas water heater 500 varies greatly depending on the season. On the other hand, according to the present embodiment, by supplying the hot water generated by the hot water storage type hot water heater 1 to the gas water heater 500, fluctuations in the incoming water temperature to the gas water heater 500 can be suppressed throughout the year. For this reason, the operation state of the gas water heater 500 can be stabilized throughout the year.

  In the present embodiment, control device 300 may periodically change target supply temperature Ths. For example, every time the integrated value of the flow rate detected by the flow rate sensor 108, that is, the amount of hot water supplied from the hot water storage type hot water heater 1 to the gas water heater 500 exceeds a predetermined supply amount (for example, 100 L), the target supply temperature Ths is set. It may be changed. If the temperature of water entering the gas water heater 500 is always constant, there is a possibility that the hot water temperature adjustment function provided in the gas water heater 500 will remain inactive for a long time. If the hot water supply temperature adjustment function of the gas water heater 500 is left inactive for a long time, it may cause malfunction of the function. On the other hand, by periodically changing the target supply temperature Ths, the temperature of the water supplied to the gas water heater 500 changes periodically, and the hot water temperature adjustment function of the gas water heater 500 operates according to the change of the water temperature. To do. Therefore, it is possible to reliably prevent the malfunction of the hot water supply temperature adjustment function of the gas water heater 500.

Embodiment 2. FIG.
Next, the second embodiment will be described with reference to FIG. 5 and FIG. 6. The difference from the first embodiment will be mainly described, and the description of the same or corresponding parts will be simplified or described. Omitted.

  The equipment configuration of the hot water storage type hot water heater 1 of the second embodiment is the same as that shown in FIG. 5 and 6 are flowcharts of a control routine executed in hot water storage type water heater 1 of the second embodiment. The hot water storage type hot water heater 1 according to the second embodiment executes processing of the routines shown in FIGS. 5 and 6 instead of the routines of FIGS. 2 and 3 of the first embodiment. The hot water storage type hot water heater 1 according to the second embodiment executes the same routine processing as in FIG. 4 according to the first embodiment.

  The process starts from step S500 in FIG. The process proceeds from step S500 to step S501. In step S501, control device 300 determines whether or not three days have elapsed since the previous boiling operation was performed. When three days have passed since the previous boiling operation, the process proceeds from step S501 to step S505. In step S505, the control apparatus 300 starts the operation of the heat pump heat source apparatus 200 and the circulation pump 102, that is, starts the boiling operation. On the other hand, when three days have not yet elapsed since the previous boiling operation, the process proceeds from step S501 to step S502.

  In step S502, control device 300 determines whether or not the current time is included in the specific time zone. When the current time is included in the specific time zone, the process proceeds from step S502 to step S504. On the other hand, when the current time is not included in the specific time zone, the process proceeds from step S502 to step S503.

  In step S503, the control device 300 sets a temperature difference (Tt−Tb) between the tank upper temperature Tt detected by the upper temperature sensor 103 and the tank lower temperature Tb detected by the lower temperature sensor 104 as a second reference value. Compare with Ts2. The second reference value Ts2 is a temperature for determining whether or not the tank upper temperature Tt can be regarded as substantially equivalent to the tank lower temperature Tb. The second reference value Ts2 may be 5 ° C., for example. When the temperature difference (Tt−Tb) is smaller than the second reference value Ts2, that is, when the tank upper temperature Tt can be regarded as substantially equal to the tank lower temperature Tb, the process proceeds from step S503 to step S504. On the other hand, when the temperature difference (Tt−Tb) is equal to or greater than the second reference value Ts2, that is, when the tank upper temperature Tt can be considered to be higher than the tank lower temperature Tb, exceeding a substantially equivalent range. The process proceeds from step S503 to step S506.

  In step S504, the controller 300 determines the value (Tp−Tstp) obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (for example, 65 ° C.), and the tank lower temperature Tb detected by the lower temperature sensor 104. Compare The boiling start reference value Tstp is larger than the second reference value Ts2. The boiling start reference value Tstp may be 10 ° C., for example. When the tank lower temperature Tb is lower than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S504 to step S505. On the other hand, when the tank lower temperature Tb is equal to or higher than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S504 to step S506.

  When the process proceeds from step S504 to step S505, the control device 300 starts the operation of the heat pump heat source apparatus 200 and the circulation pump 102, that is, starts the boiling operation. The process returns from step S505 to step S501.

  When the process proceeds from step S504 to step S506, the control device 300 stops the heat pump heat source apparatus 200 and the circulation pump 102, that is, does not perform the boiling operation.

  In the present embodiment, it is possible to detect whether or not the hot water in the hot water storage tank 101 is exhausted by the process in step S503 described above. “The state in which the hot water in the hot water storage tank 101 is used up” is a state in which the inside of the hot water storage tank 101 is filled with low-temperature water supplied from the water supply pipe 4. If the tank upper temperature Tt is substantially equal to the tank lower temperature Tb in step S503, the hot water in the hot water storage tank 101 is filled with low temperature water, that is, the hot water in the hot water storage tank 101 is used up. Can be considered.

  In this embodiment, in a time zone other than the specific time zone (for example, from 7:00 to 23:00), the process proceeds from step S503 to step S506 until the hot water in the hot water storage tank 101 is used up. Therefore, boiling operation is prohibited. For this reason, the hot water stored in the hot water storage tank 101 can be used up. As a result, medium temperature water that has been heated once by the heat pump heat source apparatus 200 and that has been reduced in temperature, that is, medium temperature water that may have decreased residual chlorine concentration due to heating, is prevented from staying in the hot water storage tank 101 for a long time. it can. Therefore, the deterioration of the water quality in the hot water storage tank 101 can be reliably prevented. In step S503, the water supply temperature detected by the water supply temperature sensor 109 may be used instead of the tank lower part temperature Tb.

  Next, FIG. 6 will be described. The process starts from step S800 of FIG. The process proceeds from step S800 to step S801. In step S801, the controller 300 compares the value (Tp−Tstp) obtained by subtracting the boiling start reference value Tstp (eg, 10 ° C.) from the target boiling temperature Tp (eg, 65 ° C.) with the tank lower temperature Tb. . If the tank lower temperature Tb is lower than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S801 to step S802. On the other hand, when the tank lower temperature Tb is equal to or higher than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S801 to step S804. In step S804, the cumulative supply amount Le is initialized to zero.

  In step S802, the temperature difference (Tt−Tb) between the tank upper temperature Tt detected by the upper temperature sensor 103 and the tank lower temperature Tb detected by the lower temperature sensor 104 is compared with the second reference value Ts2. . When the temperature difference (Tt−Tb) is smaller than the second reference value Ts2, that is, when it can be considered that the hot water in the hot water storage tank 101 is used up, the process proceeds from step S802 to step S803. On the other hand, when the temperature difference (Tt−Tb) is equal to or larger than the second reference value Ts2, that is, when the hot water in the hot water storage tank 101 has not been used up yet, the process returns from step S802 to step S801.

  In step S803, the supply flow rate Flw is added to the integrated supply amount Le. The process returns from step S803 to step S801.

  According to the processing of the flowchart of FIG. 6 described above, the total amount of water supplied from the hot water storage hot water heater 1 to the gas hot water heater 500 in a state where the hot water in the hot water storage tank 101 is used up can be detected as the integrated supply amount Le.

  Since the processing of the flowchart of FIG. 4 is the same as that of the first embodiment, description thereof is omitted. According to the second embodiment, the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG.
Next, the third embodiment will be described with reference to FIG. 7 and FIG. 8. The difference from the first embodiment will be mainly described, and the description of the same or corresponding parts will be simplified or described. Omitted.

  The equipment configuration of the hot water storage type hot water heater 1 according to Embodiment 3 is the same as that shown in FIG. 7 and 8 are flowcharts of a control routine executed in hot water storage type water heater 1 according to the third embodiment. The hot water storage type water heater 1 according to the third embodiment executes processing of routines shown in FIGS. 7 and 8 instead of the routines of FIGS. 2 and 3 of the first embodiment. The hot water storage type water heater 1 according to the third embodiment executes the same routine processing as in FIG. 4 according to the first embodiment.

  The process starts from step S600 of FIG. The process proceeds from step S600 to step S601. In step S601, control device 300 determines whether or not three days have elapsed since the previous boiling operation. If three days have passed since the previous boiling operation, the process proceeds from step S601 to step S605. In step S605, the control device 300 starts the operation of the heat pump heat source apparatus 200 and the circulation pump 102, that is, starts the boiling operation. On the other hand, if three days have not yet elapsed since the previous boiling operation, the process proceeds from step S601 to step S602.

  In step S602, control device 300 determines whether or not the current time is included in the specific time zone. When the current time is included in the specific time zone, the process proceeds from step S602 to step S604. On the other hand, when the current time is not included in the specific time zone, the process proceeds from step S602 to step S603.

  In step S603, the control device 300 calculates a temperature difference (Th−Tb) between the supply temperature Th detected by the supply temperature sensor 107 and the tank lower temperature Tb detected by the lower temperature sensor 104 as a third reference value Ts3. Compare with The third reference value Ts3 is a temperature for determining whether or not the supply temperature Th can be regarded as substantially equal to the tank lower temperature Tb. The third reference value Ts3 may be 5 ° C., for example. When the temperature difference (Th−Tb) is smaller than the third reference value Ts3, that is, when the supply temperature Th can be regarded as substantially equal to the tank lower part temperature Tb, the process proceeds from step S603 to step S604. On the other hand, when the temperature difference (Th−Tb) is equal to or greater than the third reference value Ts3, that is, when the supply temperature Th can be considered to be higher than a substantially equivalent region as compared with the tank lower temperature Tb, The process proceeds from step S603 to step S606.

  In step S604, the controller 300 determines a value (Tp−Tstp) obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (for example, 65 ° C.), and the tank lower temperature Tb detected by the lower temperature sensor 104. Compare The boiling start reference value Tstp is larger than the third reference value Ts3. The boiling start reference value Tstp may be 10 ° C., for example. When the tank lower temperature Tb is lower than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S604 to step S605. On the other hand, when the tank lower temperature Tb is equal to or higher than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S604 to step S606.

  In step S605, the control device 300 starts the operation of the heat pump heat source apparatus 200 and the circulation pump 102, that is, starts the boiling operation. The process returns from step S605 to step S601.

  In step S606, the control device 300 stops the heat pump heat source apparatus 200 and the circulation pump 102, that is, does not perform the boiling operation.

  In the present embodiment, it is possible to detect whether or not the hot water in the hot water storage tank 101 is used up by the process in step S603 described above. “The state in which the hot water in the hot water storage tank 101 is used up” is a state in which the inside of the hot water storage tank 101 is filled with low-temperature water supplied from the water supply pipe 4. The operation of the mixing valve 106 is controlled so that the supply temperature Th becomes equal to the target supply temperature Ths. When the supply temperature Th becomes lower than the target supply temperature Ths, it can be estimated that the opening of the hot water side of the mixing valve 106 is maximum. Therefore, in a state where the temperature difference (Th−Tb) is smaller than the third reference value Ts3, the supply temperature Th can be regarded as being equal to the temperature of the water taken out from the hot water storage tank 101 through the hot water discharge pipe 5. Therefore, when the temperature difference (Th−Tb) is smaller than the third reference value Ts3 in step S603, the hot water in the hot water storage tank 101 is filled with low temperature water, that is, the hot water in the hot water storage tank 101 is filled. It can be regarded as being used up.

  In the present embodiment, in a time zone other than the specific time zone (for example, from 7 o'clock to 23 o'clock), the process proceeds from step S603 to step S606 until the hot water in the hot water storage tank 101 is used up. Therefore, boiling operation is prohibited. For this reason, the hot water stored in the hot water storage tank 101 can be used up. As a result, medium temperature water that has been heated once by the heat pump heat source apparatus 200 and that has been reduced in temperature, that is, medium temperature water that may have decreased residual chlorine concentration due to heating, is prevented from staying in the hot water storage tank 101 for a long time. it can. Therefore, the deterioration of the water quality in the hot water storage tank 101 can be reliably prevented. In step S603, the water supply temperature detected by the water supply temperature sensor 109 may be used instead of the tank lower part temperature Tb.

  Next, FIG. 8 will be described. The process starts from step S900 of FIG. The process moves from step S900 to step S901. In step S901, the control device 300 compares a value (Tp−Tstp) obtained by subtracting a boiling start reference value Tstp (for example, 10 ° C.) from a target boiling temperature Tp (for example, 65 ° C.) with the tank lower part temperature Tb. . If the tank lower temperature Tb is lower than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S901 to step S902. On the other hand, when the tank lower temperature Tb is equal to or higher than the value obtained by subtracting the boiling start reference value Tstp from the target boiling temperature Tp (Tp−Tstp), the process proceeds from step S901 to step S904. In step S904, the integrated supply amount Le is initialized to zero.

  In step S902, the temperature difference (Th−Tb) between the supply temperature Th detected by the supply temperature sensor 107 and the tank lower temperature Tb detected by the lower temperature sensor 104 is compared with the third reference value Ts3. When the temperature difference (Th−Tb) is smaller than the third reference value Ts3, that is, when it can be considered that the hot water in the hot water storage tank 101 is used up, the process proceeds from step S902 to step S903. On the other hand, when the temperature difference (Th−Tb) is equal to or greater than the third reference value Ts3, that is, when the hot water in the hot water storage tank 101 has not been used up yet, the process returns from step S902 to step S901.

  In step S903, the supply flow rate Flw is added to the integrated supply amount Le. The process returns from step S903 to step S901.

  According to the process of the flowchart of FIG. 8 described above, the total amount of water supplied from the hot water storage hot water heater 1 to the gas hot water heater 500 in a state where the hot water in the hot water storage tank 101 is used up can be detected as the integrated supply amount Le.

  Since the processing of the flowchart of FIG. 4 is the same as that of the first embodiment, description thereof is omitted. According to the third embodiment, the same effect as in the first embodiment can be obtained.

  FIG. 9 is a diagram illustrating an example of a hardware configuration of the control device 300 included in the hot water storage type hot water heater 1 according to the first to third embodiments. Each function of the control device 300 is realized by a processing circuit. In the example illustrated in FIG. 9, the processing circuit of the control device 300 includes at least one processor 301 and at least one memory 302. When the processing circuit includes at least one processor 301 and at least one memory 302, each function of the control device 300 is realized by software, firmware, or a combination of software and firmware. At least one of software and firmware is described as a program. At least one of software and firmware is stored in at least one memory 302. The at least one processor 301 implements each function of the control device 300 by reading and executing a program stored in the at least one memory 302. The at least one processor 301 is also referred to as a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, and a DSP (Digital Signal Processor). For example, the at least one memory 302 includes RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory, etc.), EEPROM (Electrically Erasable Promability Memory, etc.). Alternatively, a volatile semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD (Digital Versatile Disc), or the like.

  FIG. 10 is a diagram illustrating another example of the hardware configuration of the control device 300 included in the hot-water storage type water heater 1 according to the first to third embodiments. In the example illustrated in FIG. 10, the processing circuit of the control device 300 includes at least one dedicated hardware 303. When the processing circuit includes at least one dedicated hardware 303, the processing circuit may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), or an FPGA (Field). -Programmable Gate Array), or a combination thereof. The function of each unit of the control device 300 may be realized by a processing circuit. Further, the functions of the respective units of the control device 300 may be collectively realized by a processing circuit.

  Further, a part of each function of the control device 300 may be realized by the dedicated hardware 303, and the other part may be realized by software or firmware. The processing circuit may realize each function of the control device 300 by hardware 303, software, firmware, or a combination thereof.

  Moreover, it is not limited to the structure by which operation | movement of the hot water storage type water heater 1 is controlled by a single control apparatus, It is set as the structure which controls the operation | movement of the hot water storage type water heater 1 by cooperation of several control apparatuses. Also good.

DESCRIPTION OF SYMBOLS 1 Hot water storage type hot water supply machine, 2 Outward flow path, 3 Return flow path, 4 Water supply pipe, 5 Hot water discharge pipe, 6 Supply pipe, 7 External piping, 100 Tank unit, 101 Hot water storage tank, 102 Circulation pump, 103 Upper temperature sensor, 104 Lower temperature sensor, 105 Pressure reducing valve, 106 Mixing valve, 107 Supply temperature sensor, 108 Flow rate sensor, 109 Feed water temperature sensor, 110 Boiling temperature sensor, 200 Heat pump heat source machine, 300 Control device, 301 Processor, 302 Memory, 303 Hardware 400 Supply temperature setting unit, 500 Gas water heater, 600 Bathtub

Claims (10)

A hot water storage type hot water heater that generates hot water to be supplied to a second water heater,
A hot water storage tank,
Heating means for heating water;
A boiling control means for controlling a boiling operation for accumulating hot water heated by the heating means in the hot water storage tank;
Mixing means capable of mixing hot water supplied from a hot water pipe connected to the upper part of the hot water storage tank and water supplied from a water supply pipe;
A supply pipe for supplying hot water downstream of the mixing means to a flow path connected to the second water heater;
Means for detecting whether or not the hot water in the hot water storage tank is exhausted;
Means for inhibiting the boiling operation until the hot water in the hot water storage tank is exhausted;
Equipped with a,
When the state where the hot water in the hot water storage tank has been used up does not occur in a unit period, the boiling control means determines the amount of heat accumulated in the hot water storage tank in the next boiling operation in the previous boiling operation. be that hot-water storage type water heater smaller than the amount of heat accumulated in the hot water storage tank. A hot water storage type hot water heater that generates hot water to be supplied to a second water heater,
A hot water storage tank,
Heating means for heating water;
A boiling control means for controlling a boiling operation for accumulating hot water heated by the heating means in the hot water storage tank;
Mixing means capable of mixing hot water supplied from a hot water pipe connected to the upper part of the hot water storage tank and water supplied from a water supply pipe;
A supply pipe for supplying hot water downstream of the mixing means to a flow path connected to the second water heater;
Means for detecting whether or not the hot water in the hot water storage tank is exhausted;
Means for inhibiting the boiling operation until the hot water in the hot water storage tank is exhausted;
Equipped with a,
When the amount of water supplied from the hot water storage type hot water supply device to the second hot water supply device is larger than a reference in a state where the hot water in the hot water storage tank is used up, the boiling control means performs the next boiling operation. in the quantity of heat accumulated in the hot water storage tank, water storage type water heater you most in comparison to the amount of heat accumulated in the hot water storage tank in the previous boiling up operation. A hot water storage type hot water heater that generates hot water to be supplied to a second water heater,
A hot water storage tank,
Heating means for heating water;
A boiling control means for controlling a boiling operation for accumulating hot water heated by the heating means in the hot water storage tank;
Mixing means capable of mixing hot water supplied from a hot water pipe connected to the upper part of the hot water storage tank and water supplied from a water supply pipe;
A supply pipe for supplying hot water downstream of the mixing means to a flow path connected to the second water heater;
Means for detecting whether or not the hot water in the hot water storage tank is exhausted;
Means for inhibiting the boiling operation until the hot water in the hot water storage tank is exhausted;
Means for controlling the mixing means such that the temperature of the hot water flowing through the supply pipe is equal to a target temperature;
Means for periodically changing the target temperature;
Hot water storage type water heater equipped with. A hot water storage type hot water heater that generates hot water to be supplied to a second water heater,
A hot water storage tank,
Heating means for heating water;
A boiling control means for controlling a boiling operation for accumulating hot water heated by the heating means in the hot water storage tank;
Mixing means capable of mixing hot water supplied from a hot water pipe connected to the upper part of the hot water storage tank and water supplied from a water supply pipe;
A supply pipe for supplying hot water downstream of the mixing means to a flow path connected to the second water heater;
Means for detecting whether or not the hot water in the hot water storage tank is exhausted;
Means for inhibiting the boiling operation until the hot water in the hot water storage tank is exhausted;
Equipped with a,
When the unit period has elapsed since the previous boiling operation, the boiling control means supplies hot water having a temperature higher than the temperature of the hot water accumulated in the hot water tank in the previous boiling operation. water storage type water heater implement the boiling-up operation so as to accumulate. A hot water storage type hot water heater that generates hot water to be supplied to a second water heater,
A hot water storage tank,
Heating means for heating water;
A boiling control means for controlling a boiling operation for accumulating hot water heated by the heating means in the hot water storage tank;
Mixing means capable of mixing hot water supplied from a hot water pipe connected to the upper part of the hot water storage tank and water supplied from a water supply pipe;
A supply pipe for supplying hot water downstream of the mixing means to a flow path connected to the second water heater;
Means for detecting whether or not the hot water in the hot water storage tank is exhausted;
Means for inhibiting the boiling operation until the hot water in the hot water storage tank is exhausted;
Equipped with a,
Wherein after used up the hot water of the hot water storage tank is also hot water storage type water heater that to supply water in the hot water storage tank to the second water heater. Means for detecting a tank lower temperature, which is a lower water temperature in the hot water storage tank, or a water supply temperature, which is a temperature of water supplied from the water supply pipe;
Means for detecting a supply temperature which is a water temperature in the supply pipe;
Means for detecting the presence or absence of water flow in the supply pipe;
With
When the presence of water flow in the supply pipe is detected and the hot water side opening of the mixing means is larger than a reference, the supply temperature is substantially lower than the tank lower temperature or the water supply temperature. The hot water storage type hot water supply apparatus according to any one of claims 1 to 5 , wherein the hot water storage tank is regarded as a state in which the hot water in the hot water storage tank is used up when it becomes equal. Means for detecting a tank lower temperature, which is a lower water temperature in the hot water storage tank, or a water supply temperature, which is a temperature of water supplied from the water supply pipe;
Means for detecting a tank upper temperature which is a water temperature of the upper part in the hot water storage tank;
With
6. The method according to claim 1, wherein when the tank upper temperature becomes substantially equal to the tank lower temperature or the feed water temperature, it is considered that the hot water in the hot water storage tank is used up. The hot water storage water heater described. Means for detecting a tank lower temperature, which is a lower water temperature in the hot water storage tank, or a water supply temperature, which is a temperature of water supplied from the water supply pipe;
Means for detecting a supply temperature which is a water temperature in the supply pipe;
With
When the supply temperature becomes substantially equivalent to the tank lower temperature or the supply water temperature, according to any one of claims 1 to 5 regarded as state used up the hot water of the hot water storage tank Hot water storage water heater. The said boiling control means performs the said boiling operation so that the inside of the said hot water storage tank may be filled with hot water when the unit period has passed since the previous implementation of the said boiling operation. The hot water storage type water heater according to any one of 8 . Means for controlling the mixing means such that the temperature of the hot water flowing through the supply pipe is equal to a target temperature;
The hot water storage type hot water heater according to any one of claims 1 to 9 , wherein the target temperature is a temperature that requires reheating by the second hot water heater.

Images