JP2008008563A - Storage type hot-water supply method and storage type hot-water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type hot-water supply method and a storage type hot-water supply device capable of operating a supply water heating device, heating supply water until a target heat reserve instructed by a controller is reached, and storing it in a hot water storage tank. <P>SOLUTION: A temperature in the hot water storage tank is monitored by a control means. In the control means, if the temperature in the hot water storage tank is judged to be a predetermined temperature or lower, hot water from the supply water heating device is directly mixed with supply water via a bypass three way valve, and it is used in tapping to a bathtub or hot water supply as hot water of a desired temperature. In the control means, if the temperature in the hot water storage tank is judged to be higher than the predetermined temperature, the hot water from the supply water heating device is outputted into the hot water storage tank via the bypass three way valve, and the hot water in the hot water storage tank is used as hot tapping water to the bathtub or supply hot tapping water via piping. <P>COPYRIGHT: (C)2008,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. In particular, the present invention relates to a hot water storage hot water supply method and a hot water storage hot water supply apparatus having a function of mixing hot water and hot water in the hot water storage tank and using them as hot water for a bath tub or hot water supply hot water.

  A conventional hot water storage type hot water supply apparatus uses, for example, 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. ing. In particular, the hot water storage type hot water supply device heats the lowest temperature hot water in the hot water storage tank by the heat pump unit, and sends the hot water as high temperature hot water to the uppermost portion in the hot water storage tank so that the specific gravity of water having different temperatures is increased. By utilizing the difference, hot water is stored on 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 heat pump unit in the feed water heater is supplied with commercial power, it uses midnight power as much as possible, and stores heat in the midnight time zone (currently from 23:00 to 7:00 on the next day) where the electricity rate is cheap. In order to avoid heat storage as much as possible during the daytime when the fee is high, many of the devices are designed to store heat in the late-night time period in consideration of the amount of heat used on that day. In general, the hot water storage type hot water supply apparatus is heated only by midnight power in consideration of the heat storage amount of hot water used on the day.

In addition to the hot water supply operation that taps out from a faucet, shower, etc., the conventional hot water storage type hot water supply device is a bath hot water operation that pumps out the bath to the bath tub at the set hot water temperature or pumps up from the bath tub. For example, it has a function of adding hot water to compensate for the reduced amount of hot water. The hot water storage type hot water supply apparatus can mix hot water in the hot water storage tank with the hot water to make a hot water set at a set temperature in the bath tub. The hot water storage type hot water supply apparatus is described in, for example, the following publications.
Japanese Patent Laid-Open No. 2005-127652 JP 2005-98562 A

  However, since the hot water storage type hot water supply device uses the hot water stored in the hot water storage tank as a heat source such as the hot water supply operation, the hot water supply operation to the bathtub, the reheating operation, etc., the hot water supply hot water supply continued for a long time. If the hot water supply and hot water is discharged after the bath hot water operation, or if the hot water storage tank is reheated during the daytime when the heat storage amount of the hot water storage tank is low, the hot water source of the hot water storage tank is insufficient. There may be a shortage of hot water required for bathing in the bathtub. In such a case, the heat pump unit operates at the maximum capacity, but since the capacity of the hot water storage tank is large, the hot water in the hot water storage tank cannot be immediately maintained at a high temperature.

  In such a situation, the conventional hot water storage type hot water supply apparatus takes a measure such that the hot water bathing operation or the additional hot water operation is in a standby state until high temperature hot water is stored in the hot water storage tank, and the user is notified of this. ing. In the hot water storage type hot water supply apparatus, when not notifying that the additional hot water operation is in the standby state, the user uses hot water lower than the set temperature.

  In order to solve the problems as described above, the present invention has a function that can eliminate the inconvenience of the hot water supply operation or hot water supply operation to the bath tub due to insufficient heat storage amount even in any time zone and under all use conditions. An object of the present invention is to provide a hot water storage type hot water supply method and a hot water storage type hot water supply apparatus.

(First invention)
In the hot water storage type hot water supply method of the first invention, the hot water heater is operated, the hot water is heated until the target heat storage amount commanded by the control means is reached, hot water is stored in the hot water storage tank, Hot water or hot water heated by the feed water heating device is mixed with the feed water to make the hot water to the bath tub or the hot water supply hot water, the temperature in the hot water storage tank is monitored, and the temperature in the hot water storage tank is When the temperature is lower than a predetermined temperature, the hot water from the feed water heating device is used as hot water at a desired temperature or as hot water supply to the bath tub or hot water supply hot water through a bypass three-way valve.

(Second invention)
The hot water storage type hot water supply apparatus according to the second aspect of the invention operates the water supply heating device, heats the water supply until the target heat storage amount commanded by the control means is reached, stores hot water in the hot water storage tank, and stores the hot water in the hot water storage tank. Hot water or hot water heated by the feed water heating device and the feed water are mixed to make a hot water to the bath tub, or a hot water supply hot water, a temperature detecting means for detecting the temperature of the hot water in the hot water storage tank, When the temperature of the hot water in the hot water storage tank is detected by the temperature detection means by a bypass three-way valve that distributes the hot water of the hot water heating device to the hot water storage tank and the hot water supply to the hot tub or hot water supply hot water, It is characterized by comprising at least control means for controlling hot water from the apparatus so that it can be used as hot water to the bath tub or hot water supply hot water through a bypass three-way valve. .

(Third invention)
The control means in the hot water storage type hot water supply apparatus according to the third aspect of the invention is characterized in that the predetermined temperature to be controlled is determined by hot water to the bath tub or a set temperature of the hot water hot water.

(Fourth invention)
The control means in the hot water storage type hot water supply apparatus according to the fourth aspect of the invention determines the control of the bypass three-way valve by a comparison difference between the heat storage amount in the hot water storage tank and the heat amount required for the operation other than the hot water supply to the bath tub and the hot water supply hot water discharge operation. It is characterized by that.

(Fifth invention)
The control means in the hot water storage type hot water supply apparatus according to the fifth aspect of the present invention controls the mixing valve for mixing the hot water heated by the feed water heating apparatus supplied via the bypass three-way valve to discharge hot water to the bath tub, or It is characterized by having hot water supply and hot water.

  According to the present invention, the hot water heated by the hot water heater is directly supplied to the bath tub even when a situation occurs in which hot water is insufficient in the hot water storage tank during the hot water supply operation or hot water supply hot water operation. It is possible to eliminate the inconvenience of the user such as waiting for a hot water filling operation or hot water having a temperature lower than a set temperature.

  According to the present invention, whether or not the hot water heated by the water heater is used as the hot water for the bath tub or the hot water supply hot water, whether or not the hot water temperature set by the user, the temperature in the hot water storage tank, the amount of heat and the hot water is determined. By determining according to the usage state of the operation, it is possible to output hot water having a temperature more suitable for the user's purpose.

(First invention)
In the hot water storage type hot water supply method according to the first aspect of the present invention, the hot water heater is operated, the hot water is heated until the target heat storage amount commanded by the control means is reached, and hot water is stored in the hot water storage tank. The hot water in the hot water storage tank or the hot water heated by the feed water heating device is mixed with the feed water to become hot water for the bath tub or hot water supply hot water. The temperature in the hot water storage tank is monitored by, for example, control means. When the control means determines that the temperature in the hot water storage tank is equal to or lower than a predetermined temperature, the hot water from the feed water heating device is directly mixed with the feed water via the bypass three-way valve to obtain hot water at a desired temperature. It is used as hot water to the bath tub or hot water supply hot water.

  The hot water in the hot water storage tank takes time to reach the desired hot water temperature even when hot water heated from the feed water heater is supplied as the heat capacity increases. In such a case, the present invention can mix the heated hot water and the feed water from the feed water heating device without using the hot water in the hot water storage tank to obtain a hot water at a desired temperature. Regardless of the state of the hot water inside, it can be made hot water at a temperature desired by the user.

(Second invention)
A hot water storage type hot water supply apparatus according to a second aspect of the invention includes a temperature detection means for detecting the temperature of hot water in a hot water storage tank, a bypass three-way valve that distributes the hot water in the hot water supply apparatus to the hot water to the bath tub or the hot water supply hot water, and the bypass three-way And at least a control means for controlling the valve. The hot water storage type hot water supply device operates the water supply heating device, heats the water supply until the target heat storage amount commanded by the control means is reached, stores hot water in the hot water storage tank, and stores the hot water in the hot water storage tank. Hot water or hot water heated by the feed water heating device and the feed water can be mixed to make hot water to a bath tub or hot water supply hot water. The temperature detecting means detects, for example, the temperature of the uppermost hot water in the hot water storage tank.

  The bypass three-way valve can distribute the hot water of the water supply heating device to the hot water storage tank and the hot water to the bath tub or the hot water supply hot water. When the temperature of the hot water in the uppermost part of the hot water storage tank is detected by the temperature detecting means to be equal to or lower than a predetermined temperature, the control means supplies hot water from the feed water heating device to the bath tub via a bypass three-way valve. Or, control to use as hot water supply hot water The hot water storage type hot water supply device can be used by mixing hot water directly with the water supply directly from the water supply heating device when a short time after the start of operation or when a lot of hot water is used. In addition, the temperature to be used is set, and the set temperature and the temperature in the hot water storage tank are compared to use the heated hot water from the feed water heating device, so that the control suitable for the purpose of the user is performed. be able to.

(Third invention)
The hot water storage type hot water supply apparatus of the third invention can change the predetermined temperature controlled by the control means. For example, since the set temperature of the hot water storage type hot water supply apparatus is different between winter and summer, the predetermined temperature is determined by the hot water supplied to the bath tub or the set temperature of the hot water supply hot water. That is, according to the present invention, when the set temperature is low, the predetermined temperature is low, and when the set temperature is high, the predetermined temperature is also high, so that hot water having a temperature that meets the needs of the user is output quickly.

(Fourth invention)
In the hot water storage type hot water supply apparatus of the fourth aspect of the invention, the control of the bypass three-way valve is determined by the control means based on a comparison difference between the amount of heat stored in the hot water storage tank and the amount of heat required for the operation other than the hot water supply to the bath tub and the hot water supply hot water supply operation. ing. That is, the hot water storage type hot water supply device can obtain hot water at a desired temperature quickly by controlling by the control means in consideration of heat consumption in each pipe and valve in addition to the heat storage amount in the hot water storage tank. it can.

(Fifth invention)
A hot water storage type hot water supply apparatus according to a fifth aspect of the present invention controls the mixing valve that mixes the supply water with the hot water heated by the water supply heater supplied via the bypass three-way valve, and controls the hot water to the bath tub or hot water supply. The tapping water can be a hot water having a desired temperature.

  FIG. 1 is a schematic configuration diagram for explaining a hot water storage type hot water supply apparatus according to 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 device 2 including a heat pump unit, a hot water temperature in the hot water storage tank 1 and a control device 3 that controls the feed water heating device 2, and a bath tub. 4 and a hot water outlet 73 such as a faucet. The hot water storage tank 1 is 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. The hot water storage tank 1 is vertically long and has, for example, an inlet 11 connected to a water supply pipe 12 for introducing tap water wf on its bottom surface, and low temperature hot water from the bottom of the water heater 2. And an inlet 18 for inhaling the water.

  The hot water storage tank 1 is connected at its upper surface to a discharge port 13 for deriving heated hot water in the hot water storage tank 1 and a discharge port 19 to which a bypass three-way valve 23 described later is connected. The water supply pipe 12 supplies water to the bottom of the hot water storage tank 1, and adjusts the hot water temperature of the hot water outlet 73, such as a faucet, and the second hot water temperature of the bath tub 4. It is connected to the mixing valve 50. The circulation circuit 20 heats the low temperature hot water sucked from the suction port 18 of the hot water storage tank 1 by the feed water heating device 2 and then enters the hot water storage tank 1 from the discharge port 19 through the bypass three-way valve 23. Circulate hot water.

  The first mixing valve 16 is connected on its outlet side 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, or a bath. The hot water piping 17 is provided with a thermistor 71 which is a hot water temperature detecting means and a flow rate counter 72 which is a 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.

  The second mixing valve 50 is connected to the outlet side pipe 51 to the bath tub 4 and the return side pipe 52 from the tub in an annular shape on the outlet side thereof, so that the water for circulating the hot water in the bath tub 4 is circulated. A pump 53 and a thermistor 54 serving as circulating hot water temperature detection means are provided. The thermistor 54 outputs temperature information of hot water in the bath tub 4 to the control device 3. In addition, a flow rate counter 57 is provided between the forward-side pipe 51 and the second mixing valve 50 so as to output flow rate information to the bath tub 4 to the control device 3. Further, the outward piping 51 is provided with a hot water solenoid valve 55 so that the flow rate to the bath tub 4 can be controlled from the control device 3.

  The first mixing valve 16 and the second mixing valve 50 adjust the opening area ratio so that hot water from the outlet pipe 14 and water supply (tap water) wf supplied from the bypass pipes 15 and 56 are reduced. 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. The feed water pipe 12 is provided with feed water temperature detecting means such as a thermistor 24. 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. .

  The feed water heating device 2 is composed of, for example, a heat pump unit, compresses and heats a refrigerant such as carbon dioxide, and heats water in the circulation circuit 20 via a built-in heat exchanger (not shown), and then the refrigerant. It is returned to its original state by inflating and used in circulation. Note that hot water tank output hot water temperature sensors (thermistors) 31 to 36 are provided on the outermost wall surface of the hot water storage tank 1 as shown in the figure, and the detected temperature information is also sent to the control device 3.

  The bypass three-way valve 23 is provided between the discharge port 19 provided in the upper part of the hot water storage tank 1, the circulation circuit 20, and the pipe 21. The bypass three-way valve 23 is connected by the control signal from the control device 3 so that the discharge port 19 is on either the circulation circuit 20 or the piping 21 side. When the bypass three-way valve 23 is connected to the circulation circuit 20, hot water heated by the feed water heating device 2 is supplied into the hot water storage tank 1 through the discharge port 19. When the bypass three-way valve 23 is connected to the pipe 21 side, the hot water of the feed water heating device 2 is connected so as to flow into the pipe 21, and the heated hot water is connected to the first mixing valve 16 or Via the second mixing valve 50, it is supplied to the hot water outlet 73 such as the faucet or the bath tub 4.

  In addition to the thermized water flow rate information from each thermistor and flow rate counters 57 and 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 It is configured to control the feed water heating device 2, the first mixing valve 16, the second mixing valve 50, the water pump 53 and the like based on information from an operation switch provided on an operation panel not shown. Yes. 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 hot water filling switch (not shown) of the operation panel is turned on, the control device 3 calculates the hot water calculated based on the temperature of the hot water supplied to the bath tub 4, the temperature of the supplied water, and the temperature of the hot water in the hot water storage tank 1. The opening area ratio of the second mixing valve 50 is changed so that the mixing ratio of water and water is the same. Thereafter, the hot water solenoid valve 55 is driven by the control device 3 to start hot water filling to the bath tub 4. After the hot water filling is started, the control device 3 performs hot water filling control until the set temperature and hot water amount are reached while monitoring the hot water temperature and hot water amount in the bath tub 4.

  When the bypass three-way valve 23 is connected to the discharge port 19, the hot water heated by the feed water heating device 2 enters the hot water storage tank 1 through the circulation circuit 20, and the hot water tank 1 From the uppermost part, the hot water is discharged from the hot water outlet 73 or the bath tub 4 through the outlet pipe 14 and the first and second mixing valves 16 and 50. The control device 3 controls the operation of the water pump 53 based on temperature information of the water level thermistor 31, the thermistor 54, and the like.

  When a bath hot water filling switch on an operation panel (not shown) is turned on, the control device 3 calculates the hot water calculated based on the temperature of the hot water supplied to the bath tub 4, the water supply temperature, and the hot water temperature in the hot water storage tank 1. Control is performed so as to change the opening area ratio of the second mixing valve 50 so that the mixing ratio of water becomes the same. Thereafter, the hot water solenoid valve 55 is driven by the control device 3 and the hot water (hot water filling) to the bath tub 4 is started. After the start of the hot water filling, the hot water temperature and the hot water amount in the bath tub 4 are monitored by the control device 3, and the hot water filling is continued until the set temperature and the hot water amount are reached.

  When the hot water filling operation is started, the control device 3 monitors the temperature of the water level thermistor 31 in the upper part of the hot water storage tank 1 and determines the presence or absence of hot water from the flow counter 72. The comparison target of the water level thermistor 31 is a temperature that changes in accordance with the filling temperature set by the user. The set temperature is a minimum temperature required to complete filling with the set temperature. For example, the set temperature is 45 ° C., that is, a hot water set temperature in consideration of heat radiation from the pipe and the like + α ° C. That is, the control device 3 fixes the bypass three-way valve 23 to the pipe 21 side when the water level thermistor 31 is lower than a set temperature (for example, 45 ° C.) + Α ° C. The heated hot water from the feed water heating device 2 enters the bath tub 4 from, for example, the bypass three-way valve 23, the pipe 21, the second mixing valve 50, the outgoing side pipe 51, and the hot water filled electromagnetic valve 55.

  When the water level thermistor 31 is equal to or higher than the set temperature + α ° C., the hot water storage tank 1 stores hot water having a sufficient temperature as hot water for hot water filling operation. Therefore, the control device 3 fixes the bypass three-way valve 23 to the discharge port 19 side. The feed water heating device 2 supplies heated hot water into the hot water storage tank 1. Hot water in the hot water storage tank 1 enters the bath tub 4 through the outlet 13, the outlet pipe 14, the second mixing valve 50, and the outgoing side pipe 51. While the hot water filling operation is started, the control device 3 is in a state where the water level thermistor 31 is 45 ° C. + α ° C. or more and the bypass three-way valve 23 is fixed to the discharge port 19 side. In this case, the bypass three-way valve 23 can be switched to the pipe 21 side, and the hot water heated by the feed water heating device 2 can be controlled to be used as hot water for hot water filling operation.

  Thereafter, when the detected temperature of the water level thermistor 31 becomes 45 ° C. + α ° C. or higher, the control device 3 switches the bypass three-way valve 23 to the discharge port 19 side again to heat the hot water in the hot water storage tank 1. At the same time, the uppermost hot water in the hot water storage tank 1 becomes hot water filling 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 operation other than the hot water filling operation or the hot water supply operation, and controls the switching of the fixed position of the bypass three-way valve 23 based on the difference in the amount of heat. .

  FIG. 2 is a flowchart for explaining an embodiment of the present invention. In FIG. 2, the control device 3 controls to start driving the feed water heating device 2 (step 211). The control device 3 checks whether there is a hot water supply from the hot water outlet 73 such as a faucet or a hot water supply operation to the bath tub 4 (step 212). Next, the control device 3 checks whether or not the temperature of the hot water in the hot water storage tank 1 is equal to or higher than a set temperature (step 213).

  When the control device 3 determines that the temperature of the hot water in the hot water storage tank 1 is equal to or higher than a set temperature, the hot water in the hot water storage tank 1 is discharged to the hot water outlet 73 such as a faucet or the hot water to the bath tub 4. (Step 214). When it is determined that the temperature of the hot water in the hot water storage tank 1 has not reached the set temperature or higher, the control device 3 checks whether there is a hot water operation (step 215). When it is determined in step 215 that there is a hot water operation, the control device 3 controls the bypass three-way valve 23 to be fixed to the pipe 21 side (step 216).

  The control device 3 controls the hot water from the feed water heating device 2 to be discharged to the hot water outlet 73 or the bath tub 4 through the bypass three-way valve 23 and the pipe 21 (step 217). In step 212, when the control device 3 determines that there is no hot water operation, the bypass three-way valve 23 is fixed to the discharge port 19 side, and heated hot water is supplied from the feed water heating device 2 into the hot water storage tank 1. It controls to supply (step 218). If the controller 3 determines in step 215 that there is no hot water, the bypass three-way valve 23 is fixed to the discharge port 19 side, and hot water heated from the feed water heater 2 is placed in the hot water storage tank 1. It controls to supply (step 219).

  FIG. 3 shows an embodiment of the present invention in time series. In FIG. 3A, the feed water heating device 2 is started to operate from a stopped state. The control device 3 starts a hot water filling operation. The temperature or amount of heat in the hot water storage tank 1 decreases gradually from the set temperature while the feed water heating device 2 is stopped. Or keep the heat quantity almost constant. At this time, when there is a hot water discharge operation, the control device 3 controls the bypass three-way valve 23 from the discharge port 19 side to the pipe 21 side, and the hot water heated directly from the feed water heating device 2 is used as the hot water. .

  In FIG. 3 (b), when the hot water filling operation is completed, the control device 3 controls the bypass three-way valve 23 to be on the discharge port 19 side, and the heated hot water from the feed water heating device 2 is discharged. The hot water in the hot water storage tank 1 enters the hot water storage tank 1 and the temperature and amount of heat of the hot water in the hot water storage tank 1 rise. In FIG. 3C, when the hot water filling operation is started, the control device 3 determines that the hot water in the hot water storage tank 1 is discharged from the hot water because the hot water temperature in the hot water storage tank 1 is equal to or higher than a set temperature. Become.

  In FIG. 3 (d), since the temperature of the hot water in the hot water storage tank 1 has become equal to or lower than the set temperature, the control device 3 controls the bypass three-way valve 23 to the piping 21 side, and the feed water heating device 2 Use heated hot water as direct hot water. In FIG. 3 (e), when the hot water filling operation is stopped, the control device 3 starts to increase the temperature of hot water in the hot water storage tank 1, and the bypass three-way valve 23 moves from the pipe 21 side to the discharge port 19 side. Become.

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

Explanation of symbols

1 ... Hot water storage tank 2 ... Feed water heater (heat pump unit)
DESCRIPTION OF SYMBOLS 3 ... Control apparatus 4 ... Bathtub 11 ... Introduction port 12 ... Water supply piping 13 ... Outlet port 14 ... Outlet tube 15, 56 ... Bypass piping 16 ... 1st Mixing valve 17 ... Hot water piping 18 ... Suction port 19 ... Discharge port 20 ... Circulation circuit 21 ... Piping 22 ... Thermistor 23 ... Bypass three-way valve 24, 31-36, 54, 71 ... thermistor 50 ... second mixing valve 51 ... forward side piping 52 ... return side piping 53 ... water pump 55 ... hot water filled solenoid valve 57, 72 ... Flow rate counter 73 ... Hot water outlet

Claims (5)

The feed water heating device is operated, the feed water is heated until the target heat storage amount commanded by the control means is reached, hot water is stored in the hot water storage tank, and heated by the hot water in the hot water storage tank or the feed water heating device. In the hot water storage type hot water supply method that mixes hot water and water supply to make hot water to the bath tub or hot water supply hot water,
Monitor the temperature in the hot water tank,
When the temperature in the hot water storage tank is equal to or lower than a predetermined temperature, the hot water from the feed water heating device is used as hot water at a desired temperature as hot water of the bath tub or hot water supply hot water through a bypass three-way valve. Hot water storage hot water supply method. The feed water heating device is operated, the feed water is heated until the target heat storage amount commanded by the control means is reached, hot water is stored in the hot water storage tank, and heated by the hot water in the hot water storage tank or the feed water heating device. In a hot water storage type hot water supply device that mixes hot water and water supply to make a hot water supply to a bath tub or hot water supply hot water,
Temperature detecting means for detecting the temperature of hot water in the hot water storage tank;
A bypass three-way valve that distributes the hot water of the water heating apparatus to the hot water storage tank and the hot water to the bath tub or hot water hot water
When the temperature detection means detects that the temperature of the hot water in the hot water storage tank is lower than a predetermined temperature, the hot water from the feed water heating device can be used as the hot water to the bath tub or the hot water supply hot water through the bypass three-way valve. Control means to control,
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 control means determines the predetermined temperature to be controlled based on a hot water supplied to a bath tub or a set temperature of the hot water supply hot water.   The said control means determines the control of the said bypass three-way valve by the comparison difference of the heat storage amount in a hot water storage tank, and the heat amount required for operation other than the hot-water supply to a bath tub, and hot-water supply hot-water supply operation | movement. Or the hot water storage type hot-water supply apparatus described in Claim 3.   The control means controls a mixing valve that mixes feed water with hot water heated by the feed water heating device supplied via the bypass three-way valve, and serves as hot water to a bath tub or hot water supply hot water. The hot water storage type hot water supply device according to any one of claims 2 to 4.

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