JP2007010283A - Hot water storage type hot water supply method and hot water storage type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable re-heating operation even at the time of thermal storage shortage in a hot water storage type hot water supply device storing feed water in a hot water tank until it is heated to have a predetermined thermal storage by a feed water heater. <P>SOLUTION: The hot water in the hot water tank 1 is used for reheating of a bath in the case that heat quantity detected by temperature detection means 31 to 36 is equal to or higher than a predetermined temperature. In the case that the heat quantity of the hot water in the hot water tank 1 is equal to or lower than the predetermined temperature, hot water from the feed water heater 2 is directly used to re-heat the bath. In the case that a target heat quantity is equal to or lower than the predetermined temperature and hot water instruction to feed hot water is given, the hot water from feed water heater 2 is fed as a priority and the hot water in the hot water tank 1 is used to re-heat the bath. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water storage hot water supply method in which a feed water heating device such as a heat pump unit is operated by electric power, the feed water is heated up to a target heat storage amount commanded by the control device, and can be stored in a hot water storage tank. The present invention relates to a hot water storage type hot water supply apparatus. The present invention particularly relates to a hot water storage type hot water supply method and a hot water storage type hot water supply apparatus that circulate high temperature hot water in the hot water storage tank to the outside of the hot water storage tank and have a function as a heat source for a reheating operation to a bathtub.

  A conventional hot water storage type hot water supply device uses a heat pump unit that operates with electric power, heats low temperature hot water in the lower part of the hot water storage tank or water from the water supply, and stores the hot water in the upper part of the hot water storage tank. . In particular, the hot water storage type hot water supply apparatus heats the lowest temperature hot water in the hot water storage tank by a heat pump unit and sends the hot water as the hot water to the uppermost part in the hot water storage tank. The hot water is stored in the upper side of the hot water storage tank so that it does not mix with the water on the lower side of the hot water storage tank. The hot water storage type hot water supply apparatus outputs hot water in the hot water storage tank (for example, when a faucet or the like is opened and hot water is consumed outside the hot water storage tank), and a hot water supply pipe connected to the top of the hot water storage tank. From the water supply pipe connected to the lowermost part of the hot water storage tank, water is supplied into the hot water storage tank.

  In addition, since the feed water heating device uses a heat pump unit and is supplied with commercial power, it uses midnight power as much as possible, and the midnight time zone (currently, from 23:00 to 7:00 the next day) where the electricity rate is cheap ) In order to store heat in the midnight hours, taking into consideration the amount of heat used on the day so that heat is not stored as much as possible in the daytime hours when prices are high. .

  The hot water storage type hot water supply apparatus generally has a function of raising the temperature of the hot water in the bathtub, that is, a so-called reheating function. For example, the hot water storage type hot water supply device circulates hot hot water in the hot water storage tank outside the hot water storage tank, uses it as a heat source for a reheating operation, and then returns it to the hot water storage tank again. The heat source used for the reheating operation is the heat stored in the hot water storage tank, and naturally, the amount of heat in the hot water storage tank is reduced by the amount used.

  For this reason, the hot water storage type hot water supply device is controlled so that the heating temperature by the heat pump unit can be set to the highest possible temperature during the chasing operation, and the heat pump unit is also operated at the maximum capacity. Yes.

Further, the hot water storage type hot water supply device accumulates the reheating use time in a certain period, determines the presence or absence of use results for a certain time or more, and if the use results are present, it depends on the water supply heating device rather than the case where there is no results. It is devised to store more hot water in the hot water storage tank by setting the heating temperature higher or estimating the amount of heat stored in the hot water storage tank less. Further, the hot water storage type hot water supply apparatus is described in the following publication as having a hot water discharge function and a chasing function at the same time.
Japanese Patent Laid-Open No. 2005-127652 JP 2005-98562 A

  However, in the hot water storage type hot water supply apparatus as described above, since the hot water stored in the hot water storage tank is used as a heat source for the chasing operation, if the hot water is discharged for a long time, if there is hot water after the bath hot water operation, or When the chasing operation is performed during the daytime when the amount of heat stored in the hot water storage tank is small, sufficient hot water may not be obtained as a heat source for the hot water storage tank. Although the heat pump unit operates at its maximum capacity, the hot water in the hot water storage tank cannot be immediately heated.

  Under such circumstances, some conventional hot water storage type hot water supply devices have a countermeasure in which a chasing operation is put into a standby state until hot water is stored in a hot water storage tank, and a notification to that effect is given to the user.

  In order to solve the problems as described above, the present invention provides a hot water storage type hot water supply method having a function capable of eliminating the inconvenience of a reheating operation due to a shortage of heat storage amount even in any time zone and under all use conditions. And it aims at providing a hot water storage type hot-water supply apparatus.

(First invention)
The hot water storage type hot water supply method according to the first aspect of the invention operates the feed water heating device, heats the feed water until the target heat storage amount commanded by the control device is reached, stores hot water in the hot water storage tank, and puts the hot water from the faucet. When the target heat amount in the hot water storage tank is equal to or higher than a predetermined temperature, the hot water in the hot water storage tank is used for reheating, and the target in the hot water storage tank is used. When the amount of heat is below the specified temperature, hot water from the feed water heater is used for reheating, and when the target heat amount in the hot water storage tank is below the specified temperature and there is a command for hot water, priority is given to the hot water from the water inlet. The hot water in the hot water storage tank is used for reheating.

(Second invention)
The hot water storage type hot water supply apparatus according to the second aspect of the invention operates the feed water heating device, heats the feed water until the target heat storage amount commanded by the control device is reached, stores hot water in the hot water storage tank, and puts the hot water from the faucet. Water supply heating comprising a temperature detecting means for detecting the temperature of hot water in the hot water storage tank and a first circulation circuit for heating the hot water in the hot water storage tank. And when the temperature of the hot water in the hot water storage tank is equal to or higher than a predetermined temperature by the temperature detecting means, the hot water storage tank is connected to the second circulation circuit. A first three-way valve that can send hot water to the second circulation circuit, a heat exchanger that exchanges heat with the hot water circulating in the second circulation circuit, and hot water that is heat-exchanged by the heat exchanger The first to circulate A circulation circuit, characterized in that it comprises at least a third that of inserted the circulation circuit the second three-way valve for reheating leads to tub.

(Third invention)
In the third hot water storage type hot water supply apparatus, the predetermined temperature of the hot water in the hot water storage tank of the second invention is determined by a necessary temperature for raising the hot water temperature of the bathtub.

(Fourth invention)
In the hot water storage type hot water supply apparatus according to the fourth aspect of the invention, the opening and closing of the first three-way valve of the second aspect or the third aspect of the invention is determined by the presence or absence of hot water other than the reheating operation.

(Fifth invention)
In the hot water storage type hot water supply apparatus of the fifth aspect of the invention, the opening and closing of the first three-way valve of the second to fourth aspects of the invention is determined by a comparison difference between the amount of heat stored in the hot water storage tank and the amount of hot water other than the reheating operation. It is characterized by that.

(Sixth invention)
In the hot water storage type hot water supply apparatus of the sixth aspect of the invention, the first three-way valve of the second aspect of the invention comprises a mixing valve capable of mixing the hot water in the hot water storage tank and the hot water from the feed water heating apparatus.

  According to the present invention, even if a situation occurs in which hot water is insufficient in the hot water storage tank during reheating, by using the hot water heated by the feed water heating device directly as a heat source for reheating, It is possible to eliminate the inconvenience of the user such as the standby operation standby.

  According to the present invention, whether or not the hot water heated by the feed water heating device is used as a heat source for the reheating operation, whether the rising temperature of the hot water in the bathtub due to the reheating operation, the temperature and the amount of heat in the hot water storage tank, By deciding according to the usage situation, it is possible to perform control more suited to the user's purpose.

(First invention)
The hot water storage type hot water supply method according to the first aspect of the present invention is the operation of operating the water supply heating device to heat the water supply and store hot water in the hot water storage tank until the target heat storage amount is reached according to a command from the control device. The hot water stored inside can be used from the faucet, or can be used for reheating to the bathtub. The hot water in the hot water storage tank is detected by the temperature detecting means, and is used for replenishing when the target heat amount is equal to or higher than a predetermined temperature. When the hot water in the hot water storage tank is below the target heat quantity by the temperature detecting means, the hot water from the feed water heating device is used for direct reheating. In addition, when there is a command for tapping hot water below the target heat amount, the hot water from the water inlet is given priority as tapping hot water, and the hot water in the hot water storage tank is used for reheating.

(Second invention)
The hot water storage type hot water supply apparatus according to the second aspect of the invention operates the feed water heating device, heats the feed water until the target heat storage amount commanded by the control device is reached, stores hot water in the hot water storage tank, and puts the hot water from the faucet. Use for use and for retreating to the bathtub. The temperature detecting means detects the temperature of hot water in the hot water storage tank. The feed water heating means includes a first circulation circuit including a pipe that discharges hot water having a low temperature from the lower part of the hot water storage tank and then discharges the hot water from the upper part of the hot water storage tank. Moreover, the 2nd circulation circuit is piped so that it may discharge to the lower part of the said hot water storage tank via the heat exchanger from the upper part of the said hot water storage tank.

  The first three-way valve allows hot water to flow from the hot water storage tank to the second circulation circuit when the temperature of the hot water in the hot water storage tank is equal to or higher than a predetermined temperature by the temperature detecting means, and the temperature of the hot water is a predetermined temperature. In the following cases, the hot water heated by the feed water heater is controlled so as to be sent directly to the second circulation circuit. That is, hot water circulating in the first circulation circuit flows through the second circulation circuit via the first three-way valve and the heat exchanger. The hot water heat-exchanged by the heat exchanger circulates in the third circulation circuit and enters the reheating kiln of the bathtub through the reheating second three-way valve. Even when the hot water in the hot water storage tank does not reach a desired temperature, the hot water heated by the feed water heating device can be directly used as a reheating heat source via the heat exchanger, which is inconvenient for the user. Can be eliminated.

(Third invention)
The predetermined hot water temperature in the hot water storage tank of the third aspect of the invention is determined by the necessary temperature for raising the hot water temperature in the bathtub. When the temperature of the hot water in the bathtub is low, the hot water in the hot water storage tank is not high, and it takes too much time for reheating. On the other hand, when the temperature of the hot water in the bathtub is relatively high, the hot water in the hot water storage tank can be reheated in a short time even if it is not so high. Therefore, the temperature difference between the hot water temperature in the hot water storage tank and the hot water temperature in the bathtub can determine whether to use the hot water in the hot water storage tank or the hot water heated by the feed water heating device. .

(Fourth invention)
The opening and closing of the first three-way valve of the fourth invention is determined by whether or not there is hot water other than the chasing operation. The first three-way valve opens to the hot water side when there is hot water other than the reheating operation, and opens to the hot water side when there is no hot water.

(Fifth invention)
The opening and closing of the first three-way valve of the fifth aspect of the invention is determined based on a comparison difference between the amount of heat stored in the hot water storage tank and the amount of discharged hot water other than the reheating operation. That is, when the amount of heat of the hot water is low and can be covered by the amount of heat stored in the hot water storage tank, the hot water is supplied from the hot water storage tank. When the amount of heat of the hot water is high, the first three-way valve closes the reheating side and opens to the hot water side.

(Sixth invention)
The first three-way valve of the sixth aspect of the invention can be used as a mixing valve by mixing hot water in a hot water storage tank and hot water heated by a feed water heater. That is, the first three-way valve does not completely tighten even when there is a command for tapping, but uses a part of the hot water from the heated feed water heating device for tapping, and the rest is used for reheating. be able to.

  FIG. 1 is a schematic view for explaining a hot water storage type hot water supply apparatus which is an embodiment of the present invention. In FIG. 1, a hot water storage type hot water supply apparatus includes a hot water storage tank 1, a feed water heating apparatus 2 such as a heat pump unit, and a controller 3 that controls the hot water temperature in the hot water storage tank 1 and the feed water heating apparatus 2. Yes. The hot water storage tank 1 and the feed water heating device 2 include a feed water pipe 12, a first circulation circuit 20, a second circulation circuit 43, a third circulation circuit 57, bypass pipes 15 and 56, and a first Three-way valve 23, second three-way valve 55, first mixing valve 16, second mixing valve 50, water pumps 47 and 53, heat exchanger 81, and thermistors 31 to 36 in the hot water storage tank. And thermistors 21, 48, 54, 71 in the pipe.

  The hot water storage tank 1 is usually made of a metal having excellent corrosion resistance, such as stainless steel, and a heat insulating material (not shown) is arranged on the outer peripheral portion, so that hot water for hot water supply can be kept warm for a long time. ing. The hot water storage tank 1 is generally vertically long and has a water supply inlet 11 on the bottom surface thereof, and water supply for introducing water supply (generally tap water) Wf into the lowermost portion of the hot water storage tank 1 at the inlet 11. The pipe 12 is connected.

  The feed water pipe 12 is provided with a feed water temperature detecting means such as a thermistor 21. The temperature information in the water supply pipe 12 is output to the control device 3. The water supply pipe 12 is connected to bypass pipes 15 and 56 connected to the first mixing valve 16 and the second mixing valve 50, and the water supply Wf is selectively allowed to flow therethrough. .

  At the uppermost part of the hot water storage tank 1, a discharge port 13 through which hot water is discharged is provided. The outlet 13 is connected to a outlet pipe 14 which is a hot water outlet path for leading hot water in the hot water storage tank 1. In the middle of the outlet pipe 14, a first mixing valve 16 and a second mixing valve 50 are provided. The first mixing valve 16 and the second mixing valve 50 adjust the opening area ratio between the hot water from the outlet pipe 14 and the water supply (tap water) Wf supplied from the bypass pipes 15 and 56. The mixing ratio can be adjusted. In general, the first mixing valve 16 and the second mixing valve 50 are electric valves that adjust the opening degree of each path by driving a valve body by a drive source such as a servo motor (not shown). It is actuated by a control signal from the device 3.

  An outlet side of the first mixing valve 16 is connected to a hot water supply pipe 17 that is a mixed hot water path to a hot water outlet 73 such as a faucet, a shower, and a bath. The hot water supply pipe 17 is provided with a thermistor 71 as hot water temperature detecting means and a flow rate counter 72 as hot water amount detecting means. The thermistor 71 outputs temperature information in the hot water piping 17, and the flow rate counter 72 outputs flow information in the hot water piping 17 to the control device 3.

  An outlet side pipe 51 and a return side pipe 52 from the bathtub are annularly connected to the outlet side of the second mixing valve 50, a water pump 53 for circulating hot water in the bathtub, and circulating hot water. A thermistor 54 that is a temperature detecting means is provided. The thermistor 54 outputs temperature information of hot water circulating in the third circulation circuit 57 to the control device 3 after heat exchange by the heat exchanger 81 provided in the second circulation circuit 43. Yes.

  A second three-way valve 55 is provided in the middle of the outgoing pipe 51 to the bathtub, and is connected so that the hot water circulation path of the bathtub can be switched by a control signal from the control device 3. During the reheating operation, the second three-way valve 55 is switched to the third circulation circuit 57 side through which the heat-exchanged hot water circulates.

  In the lower part of the hot water storage tank 1, a suction port 18 is provided for sucking the water in the lowermost part of the hot water storage tank 1 toward the feed water heater 2. On the upper side of the hot water storage tank 1, a discharge port 19 is provided for discharging hot water from the feed water heater 2 toward the uppermost part in the hot water storage tank 1. That is, the suction port 18 and the discharge port 19 are connected to the first circulation circuit 20. A part of the first circulation circuit 20 is disposed in the feed water heating device 2 controlled by the control device 3.

  The feed water heater 2 is composed of, for example, a heat pump unit, compresses and heats a refrigerant such as carbon dioxide, and heats water in the first circulation circuit 20 via a built-in heat exchanger (not shown). The refrigerant is expanded and returned to its original state for circulation. Although not shown, a hot water tank output hot water temperature sensor is provided on the outermost wall surface of the hot water tank 1, and this detected temperature information is also sent to the control device 3.

  A first three-way valve 23 is provided in the second circulation circuit 43 provided in the upper part of the hot water storage tank 1. The first three-way valve 23 is connected so that the supply port to the second circulation circuit 43 is either the feed water heating device 2 side or the suction port 41 side by a control signal from the control device 3. . When the first three-way valve 23 is switched to the feed water heating device 2 side, the hot water heated by the feed water heating device 2 is switched to the suction port 41 side. Are supplied to the second circulation circuit 43, respectively.

  The hot water storage tank 1 has a suction port 41 at the upper part and a discharge port 42 for discharging hot water into the hot water storage tank 1 at the lower part. The suction port 41 and the discharge port 42 are connected to each other in the second circulation. The circuit 43 is connected so as to circulate. The second circulation circuit 43 is provided with a heat exchanger 81 inside. The heat exchanger 81 is, for example, a counter-flow type, and can exchange heat between hot water flowing in the second circulation circuit 43 and hot water in the bathtub flowing in the third circulation circuit 57.

  A water pump 47 for circulating hot water in the second circulation circuit 43 and a thermistor serving as circulating hot water temperature detection means are provided downstream of the portion of the second circulation circuit 43 where the heat exchanger 81 is provided. 48 is provided. The thermistor 48 outputs temperature information of hot water after heat exchange by the heat exchanger 81 in the second circulation circuit 43 to the control device 3.

  In addition to the information on the hot water flow from each thermistor and flow rate counter 72 described so far, the control device 3 includes information from the thermistor 22 which is an outside air temperature detecting means provided in the feed water heating device 2 and is not shown. Based on the information from the operation switch provided in the operation panel, the feed water heating device 2, the first mixing valve 16, the second mixing valve 50, the water pumps 47, 53, and the like are controlled. An operation panel (not shown) is generally installed in the vicinity of a place where a user uses hot water, such as in a bathroom or a kitchen, and the operation panel other than the operation panel is installed in a suitable place such as outdoors.

  When the power switch (not shown) of the hot water storage hot water supply device is turned on, the control device 3 is controlled by temperature information from each thermistor provided in the hot water storage tank 1 or an operation panel (not shown). Based on the set time information and the like, the feed water heating device 2 is appropriately operated to heat the water in the hot water storage tank 1 and boil it up to high temperature hot water (for example, 90 ° C. hot water). Further, the control in the hot water storage type hot water supply apparatus is designed to be performed as inexpensively as possible using midnight power.

  When a reheating switch of an operation panel (not shown) is turned on, the control device 3 operates the water pumps 47 and 53 and drives the second three-way valve 55 to the heat exchanger 81 side. Furthermore, when the control device 3 drives the first three-way valve 23 and is fixed to the suction port 41 side, a high temperature is introduced into the second circulation circuit 43 from the suction port 41 at the top of the hot water storage tank 1. The hot water is sucked and circulated, and the hot water in the bathtub is controlled to circulate in the third circulation circuit 57 via the heat exchanger 81. When the first three-way valve 23 is fixed to the feed water heating device 2 side, the control device 3 directly sucks high-temperature hot water heated by the feed water heating device 2 into the second circulation circuit 43 and heats it. Control is performed so that the hot water in the bathtub is circulated in the third circulation circuit 57 via the exchanger 81.

  The hot water in the bathtub in the third circulation circuit 57 is reheated by exchanging heat with the hot water flowing in the second circulation circuit 43 in the heat exchanger 81. At this time, the control device 3 controls the operation of the water pumps 47 and 53 so that heat exchange in the heat exchanger 81 is favorably performed based on the temperature information of the water level thermistor 31, the thermistor 54, and the like.

  Here, driving of the first three-way valve 23 during the chasing operation will be described. When the reheating operation is started, the water level thermistor 31 at the upper part of the hot water storage tank 1 monitors the temperature of the hot water at the upper part of the hot water storage tank 1. Moreover, the flow rate counter 72 determines the presence or absence of hot water. The comparison of the water level thermistor 31 is a temperature for each preset reheating operation (necessary rising temperature). The temperature is in the vicinity of the minimum temperature required as a heat source for the chasing operation. (Eg 60 ° C)

  When the water level thermistor 31 is less than 60 ° C., the control device 3 operates the feed water heating device 2 for a reheating operation. The control device 3 may operate the feed water heating device 2 for heat storage other than the reheating operation. When it is determined by the flow rate counter 72 that the hot water is being discharged, the control device 3 performs control so that the hot water is given priority. When giving priority to hot water, the first three-way valve 23 is fixed to the suction port 41 side so that hot water in the upper part of the hot water storage tank 1 can be sucked. The control device 3 controls the hot water heated by the feed water heating device 2 to be supplied into the hot water storage tank 1, while controlling the uppermost hot water in the hot water storage tank 1 as a heat source for the reheating operation. .

  When the water level thermistor 31 is less than 60 ° C. and the flow rate counter 72 determines that there is no hot water, the first three-way valve 23 is fixed to the feed water heater 2 side by the controller 3. Thereby, the hot water heated by the feed water heater 2 circulates through the second circulation circuit 43 and becomes a heat source for the reheating operation.

  When the water level thermistor 31 is 60 ° C. or higher, sufficient hot water as a heat source is accumulated in the hot water storage tank, so that the first three-way valve 23 is fixed to the inlet 41 side regardless of the state of the flow counter 72. It is controlled so that.

  The operation at the start of the chasing operation has been described above, but the same applies to the chasing operation. When the water level thermistor 31 is 60 ° C. or higher and the first three-way valve 23 is fixed to the suction port 41 at the start of the chasing operation, The three-way valve 23 is switched to the feed water heating device 2 side by the control device 3 and is controlled so that the heated hot water becomes a heat source for the reheating operation.

  Further, when hot water is detected by the flow rate counter 72, the first three-way valve 23 is switched to the inlet 41 side again to heat the hot water in the hot water storage tank 1, while the uppermost hot water in the hot water storage tank 1 is heated. Becomes a heat source for chasing operation.

  The control device 3 constantly calculates the amount of heat stored in the hot water storage tank 1 and the amount of heat required for the operation other than the chasing operation, and even when the tap and the shower hot water start, The fixed position of the three-way valve 23 may be switched.

  As described in detail above, the case where the first three-way valve 23 is used as a means for using hot water heated by the feed water heating device 2 as a heat source for the chasing operation has been described. It can be a mixing valve. The mixing valve changes the opening area ratio according to the temperature in the hot water storage tank 1 or the amount of heat storage, adjusts the mixing ratio of hot water from the hot water supply device 2 and hot water in the hot water storage tank 1 and is mixed. It is also possible to use hot water as a heat source for the chasing operation.

  FIG. 2 is a flowchart of one embodiment of the present invention. FIG. 3 shows one embodiment of the present invention in time series. 2 and 3, the control device 3 is controlled to start driving the feed water heating device 2 (step 211, FIG. 3 (A)). The control device 3 checks whether there is a command for chasing the hot water in the bathtub (step 212). When the control device 3 determines that the operation is a reheating operation of the bathtub, it checks whether or not the temperature of the hot water in the hot water storage tank 1 has reached the set temperature (step 213).

  When it is determined that the temperature of the hot water in the upper portion of the hot water storage tank 1 has not reached the set temperature (step 213), the control device 3 checks whether or not there is a hot water command (step 214). When it is determined that there is no instruction for hot water, the control device 3 controls the first three-way valve 23 to be on the feed water heating device 2 side (FIG. 3 (A)) (step 215). Under the control of the control device 3, high-temperature hot water is circulated directly from the feed water heating device 2 to the second circulation circuit 43, and a bath reheating operation state is established (step 216).

  When it is determined in step 212 that there is no reheating operation, the control device 3 outputs the hot water in the upper part of the hot water storage tank 1 as tapping (step 217). In Step 214, when the control device 3 determines that the reheating operation is performed and the temperature of the hot water in the hot water storage tank 1 is not the set temperature and that there is a command for hot water, the first three-way valve 23 is turned on. On the inlet 41 side of the hot water storage tank 1 (step 218, FIG. 3 (b)), the hot water in the hot water storage tank 1 is circulated through the second circulation circuit 43 to make a reheating operation (step 219). And for hot water, priority is given to using hot water from the feed water heating device 2 via the hot water storage tank 1.

  In step 213, when the control device 3 determines that the reheating operation is performed and the temperature of the hot water in the hot water storage tank 1 is the set temperature, the first control is performed regardless of whether or not there is a hot water discharge command. The three-way valve 23 is set to the suction port 41 side (step 220), and is reheated with hot water in the hot water storage tank 1 (step 221 and FIG. 3 (c)).

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example. The present invention can be modified in various ways without departing from the scope of the claims. For example, a known hot water tank, a feed water heating device, a control device, a temperature detection member such as a thermistor, valves, and piping can be used.

It is the schematic for demonstrating the hot water storage type hot-water supply apparatus which is an Example of this invention. (Example) It is the figure which made one Example of this invention into the flowchart. FIG. 2 is a time-series representation of an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water storage tank 2 ... Water supply heating apparatus (heat pump unit)
DESCRIPTION OF SYMBOLS 3 ... Control apparatus 11 ... Inlet port 12 ... Water supply piping 13 ... Outlet port 14 ... Outlet tube 15 ... Bypass piping 16 ... 1st mixing valve 17 ... Outlet Piping 18 ... Suction port 19 ... Discharge port 20 ... First circulation circuit 23 ... First three-way valve 21, 22, 31-36, 48, 54, 71 ... Thermistor 41 ..Suction port 42 ... Discharge port 43 ... Second circulation circuit 47 ... Water pump 50 ... Second mixing valve 51 ... Pipe-side piping to the bathtub 52 ... From the bathtub Return side piping 53 ... Water pump 55 ... Second three-way valve 56 ... Bypass piping 57 ... Third circulation circuit 72 ... Flow counter 73 ... Hot water outlet 81 ... Heat exchanger

Claims (6)

Operate the feed water heating device, heat the feed water until the target heat storage amount commanded by the control device is reached, store hot water in the hot water storage tank, use the hot water from the faucet, and retreat to the bathtub In the hot water storage hot water supply method used,
When the target heat amount in the hot water storage tank is equal to or higher than a predetermined temperature, the hot water in the hot water storage tank is used for reheating,
If the target heat amount in the hot water storage tank is below a predetermined temperature, use hot water from the feed water heating device for reheating,
A hot water storage system characterized in that when the target heat amount in the hot water storage tank is equal to or lower than a predetermined temperature and there is a command of hot water, priority is given to hot water from the outlet, and the hot water in the hot water storage tank is used for reheating. Hot water supply method. Operate the feed water heating device, heat the feed water until the target heat storage amount commanded by the control device is reached, store hot water in the hot water storage tank, use the hot water from the faucet, and retreat to the bathtub In the hot water storage type hot water supply device used,
Temperature detecting means for detecting the temperature of hot water in the hot water storage tank;
Feed water heating means comprising a first circulation circuit for heating hot water in the hot water storage tank;
When the temperature of the hot water in the hot water storage tank is equal to or higher than a predetermined temperature by the temperature detecting means, the second hot water tank is connected to the second circulation circuit. A first three-way valve capable of sending hot water to the circulation circuit of
A heat exchanger for exchanging heat with hot water circulating in the second circulation circuit;
A third circulation circuit in which the hot water heat-exchanged by the heat exchanger circulates;
A second three-way valve for replenishment inserted into the third circulation circuit and connected to the bathtub;
A hot water storage type hot water supply apparatus characterized by comprising at least.   The hot water storage type hot water supply apparatus according to claim 2, wherein the predetermined temperature of the hot water in the hot water storage tank is determined by a required temperature for raising the hot water temperature of the bathtub.   The hot water storage hot water supply apparatus according to claim 2 or 3, wherein the opening and closing of the first three-way valve is determined by the presence or absence of hot water other than the reheating operation.   The opening and closing of the first three-way valve is determined by a comparison difference between a heat storage amount in the hot water storage tank and a heat amount of the hot water other than the reheating operation. The hot water storage type hot water supply apparatus described in the item.   The hot water storage type hot water supply apparatus according to claim 2, wherein the first three-way valve is a mixing valve capable of mixing hot water in a hot water storage tank and hot water from a feed water heating device.

Images