JP5809857B2 - Auxiliary heating device - Google Patents

Description

  The present invention relates to an auxiliary heating device that assists in bathing.

  In a bath retreat operation using a bath tub or a bath water heater, generally, by operating a pump, the bath water is taken from the bath through the bath return pipe, and this bath water is heated through the water tube of the heat exchanger. The bath water is circulated back into the bathtub through the bath return pipe to raise the temperature of the bath water in the bathtub.

  On the other hand, there are two types of bath tubs and bath water heaters equipped with an automatic hot water filling function: a type in which the water level in the bathtub is detected by a pressure sensor and the hot water is filled to a set water level (so-called fully automatic), and a bathtub at the set water level. There is a type (so-called semi-automatic) in which the amount of water in water (target water amount) is grasped in advance and only the amount of difference between the current water amount and the target water amount is poured. In the latter type, the amount of water in the bathtub is calculated based on the amount of heat added to the bath water by this reheating operation and the rising temperature of the bath water before and after the amount of heat is added. (Residual water amount) is calculated (for example, refer to Patent Document 1).

  By the way, from the viewpoint of the effective use of energy, the water in the hot water storage tank is heated using exhaust heat from various devices, solar heat, etc., and the hot water in the hot water storage tank is supplied to the water heater, so that there is a shortage relative to the set temperature. There is a hot water supply system in which only hot water is heated and heated by a hot water heater to discharge hot water (see, for example, Patent Document 2). Moreover, there exists a bath automatic control apparatus which pours the hot water heated using solar heat into a bathtub (for example, refer patent document 3). In this bath automatic control device, when the temperature of hot water heated by solar heat is higher than the set temperature, the water is mixed to adjust the temperature and poured, and when the temperature of hot water heated by solar heat is lower than the set temperature, The temperature is raised to the set temperature by the subsequent reheating.

Japanese Patent Publication No. 2-3105 JP 2006-010114 A JP-A 61-173050

  Exhaust heat and solar heat can be used not only for heating the water in the hot water storage tank or for heating when the water is filled, but also for reheating the bath. For example, in the middle of a recirculation circulation path (bath → bath return pipe → bath water heater heat exchanger → bath outlet pipe → bathtub) formed between the bathtub and bath water heater, If an auxiliary heat exchanger is inserted, exhaust heat or solar heat can be used to raise the temperature of the bathtub water.

  However, when the auxiliary heat exchanger is provided in the middle of the bath return pipe that takes in the bathtub water from the bathtub, the bathtub water heated by the heat exchanger directly reaches the bath water heater from the auxiliary heat exchanger. Therefore, the bath return temperature sensor provided in the bath water heater detects the temperature of the bathtub water after the temperature rises with the auxiliary heat exchanger, and detects the temperature of the bathtub water in the bathtub, which is the original purpose. Can not be. As a result, there is a problem that the bath water heater erroneously detects that the bath water in the actual bath has reached the set temperature before reaching the set temperature, and the bath water heater ends the reheating operation. In addition, in the residual water amount calculation, even though the temperature of the bath water rises due to the heat from the auxiliary heat exchanger, the residual water amount calculation is performed using only the amount of heat added by the bath water heater as the heating amount. The calculation is performed less, causing a problem that hot water overflows from the bathtub. In particular, after installing a bath water heater that is not premised on the use of solar heat, etc., for example after several years, an auxiliary heat exchanger (for example, an auxiliary heat exchange that transfers heat from a heat collecting device that collects solar heat to bathtub water) When installing a hot water heater later and trying to connect it to a bath water heater, the control program that assumes the connection of an auxiliary heat exchanger is often not pre-installed in the bath water heater in advance. Is likely to occur.

  The present invention is intended to solve the above-described problem, and the bath pot having a reheating function can assist the temperature rise of the bath water without erroneously detecting the temperature of the bath water in the bath. The object is to provide a heating device.

  The gist of the present invention for achieving the object lies in the inventions of the following items.

[1] A bath having a bath reheating function that heats the bathtub water taken from the bathtub through the bath return pipe and returns the heated bathtub water to the bathtub through the bath return pipe to raise the temperature of the bathtub water in the bathtub. A heat exchanger inserted in the middle of the bath outlet pipe of the kettle;
A heat source for heating the heat exchanger;
I have a,
When the remaining amount of water is calculated from the amount of heat applied to the bath water and the amount of temperature rise of the bath water due to this heating, the heating of the heat exchanger by the heat source unit is stopped when the remaining amount of water is calculated. An auxiliary heating device characterized by that.

  In the said invention, a heat exchanger is provided in the middle of a bathing pipe. Thereby, the bath water in the bath going-out pipe heated by the heat exchanger of the auxiliary heating device is poured into the bath without directly returning to the bath. Therefore, even if the heat exchanger of the auxiliary heating apparatus is installed in the middle of the circulation path, the bath can detect the temperature of the bathtub water taken in from the bath return pipe, thereby correctly detecting the temperature of the bathtub water in the bathtub. be able to.

  In the above invention, heating of the heat exchanger by the heat source unit is stopped while the bath pot calculates the remaining water amount. Thereby, the bathtub can correctly calculate the remaining water amount without considering the amount of heat from the auxiliary heating device.

[ 2 ] Hot water storage tank,
A heat collecting device for collecting solar heat;
A radiator for heating the hot water in the hot water storage tank;
A circulation path of a heat medium fluid formed between the heat collector and the radiator;
A pump for circulating a heat medium fluid between the heat collecting device and the radiator through the circulation path;
With
Said heat exchanger, said interposed in the middle of the circulation path, Ri heat exchanger der to transfer heat between the bath water through the heat medium fluid and the bath forward pipe through the circulation path,
[1 ] characterized in that the pump is stopped when the remaining amount of water is calculated from the amount of heat applied to the bathtub water and the amount of temperature rise of the bathtub water due to this heating . auxiliary heating device according to.

  In the above invention, the auxiliary heating device is a system that functions to raise the temperature of hot water in the hot water storage tank using solar heat, the heat source is a heat collecting device that collects solar heat, and the heat exchanger is a heat collecting device. It is a water heat exchanger (water-water heat exchanger) that moves the heat of the heat medium that has received heat to the bath water on the side of the bath pipe.

In the said invention, the heating of the bath water by an auxiliary heating apparatus is stopped by stopping the pump which circulates a thermal medium.
[3] A bath having a bath reheating function for heating the bathtub water taken from the bathtub through the bath return pipe and returning the heated bathtub water to the bathtub through the bath return pipe to raise the temperature of the bathtub water in the bathtub. A heat exchanger inserted in the middle of the bath outlet pipe of the kettle;
A hot water storage tank,
A heat collecting device for collecting solar heat;
A radiator for heating the hot water in the hot water storage tank;
A circulation path of a heat medium fluid formed between the heat collector and the radiator;
A pump for circulating a heat medium fluid between the heat collecting device and the radiator through the circulation path;
With
The heat exchanger is a heat exchanger that is inserted in the middle of the circulation path and moves heat between the heat medium fluid passing through the circulation path and the bath water passing through the bath outlet pipe,
When the remaining amount of water is calculated from the amount of heat applied to the bath water and the amount of temperature rise of the bath water due to this heating, the pump is stopped when the remaining amount of water is calculated.
An auxiliary heating device characterized by that.

  According to the auxiliary heating device according to the present invention, the temperature of the bathtub water can be assisted without erroneous detection of the temperature of the bathtub water in the bathtub by the bath pot having the reheating function.

It is explanatory drawing which shows the structure of the hot water supply system containing the auxiliary heating apparatus of this invention. It is explanatory drawing which shows schematic structure of a bath water heater. It is explanatory drawing which shows schematic operation | movement of heat collecting operation. It is explanatory drawing which shows schematic operation | movement of a hot water supply driving | operation. It is explanatory drawing which shows the circulation path of the bathtub water during a chasing operation | movement. It is a graph which shows the relationship between the rising temperature of bathtub water in the amount calculation of residual water, and the amount calculation value of residual water. It is explanatory drawing which shows schematic operation | movement of a solar reheating operation. It is explanatory drawing which shows schematic operation | movement of a bath heat recovery driving | operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration of a hot water supply system 10 including an auxiliary heating device of the present invention. The hot water supply system 10 includes a hot water storage system 11 and a bath water heater 12.

  The hot water storage system 11 includes a hot water storage tank 14 that stores hot water heated using sunlight, and supplies hot water from the hot water storage tank 14 to the water inlet of the bath water heater 12. The bath water heater 12 fulfills the function of heating the water supplied from the hot water storage system 11 to a set temperature as needed and discharging the hot water to the hot water supply pipe 13 or pouring water into the bathtub 3. The hot water storage system 11 preferentially uses hot water heated using sunlight, thereby suppressing the heating by the bath water heater 12 (hereinafter referred to as “follow-up heating”) to reduce energy consumption. Enable hot water supply.

  A detailed configuration of the hot water storage system 11 will be described. The hot water storage tank 14 is a hollow, substantially cylindrical tank, and has piping connection ports at the bottom and the ceiling. The terminal end of the water supply pipe 15 is connected to the bottom pipe connection port. One end of the connection pipe 16 is connected to the pipe connection port of the ceiling, and the other end of the connection pipe 16 is connected to the water inlet of the bath water heater 12.

  A mixing valve 17 that mixes hot water and hot water from the hot water storage tank 14 is provided in the middle of the connection pipe 16. Here, the mixing valve 17 includes two valves, a first valve 17a and a second valve 17b. The first valve 17 a is inserted in the connection pipe 16. The second valve 17b is inserted in the middle of the branch water supply pipe 15a which branches from the middle of the water supply pipe 15 and merges with the connection pipe 16 on the bath water heater 12 side of the first valve 17a. The first valve 17a and the second valve 17b are water amount adjusting valves whose opening degrees (water flow amount) can be adjusted from 0% to 100%, respectively. The mixing ratio of hot water and hot water from the hot water storage tank 14 is adjusted by the opening degree of the first valve 17a and the second valve 17b.

  The hot water storage tank 14 has, for example, a capacity of 100 liters, and a first temperature sensor 41 for detecting the water temperature at a water level of 20 liters from the bottom is located at a water level of 40 liters from the bottom. The second temperature sensor 42 for detecting the water temperature of the water is located at a location where the water level is 60 liters from the bottom, and the third temperature sensor 43 for detecting the water temperature at that location is located at the location where the water level is 80 liters from the bottom. A fourth temperature sensor 44 for detecting the above is provided.

  In addition, the connection piping 16 in the vicinity of the piping connection port on the ceiling of the hot water storage tank 14 is provided with a tank hot water temperature sensor 46 that detects the temperature of the hot water coming out of the hot water storage tank 14. A water supply temperature sensor 47 for detecting the water supply temperature is provided in the middle of the water supply pipe 15. Further, a water amount sensor 48 is connected to the connecting pipe 16 on the outlet side (bath water heater 12 side) of the mixing valve 17, and the temperature of hot water after mixing by the mixing valve 17 is further downstream (bath water heater 12 side). A mixed temperature sensor 49 is provided to detect the above.

  A heat exchange pipe (heat radiator) 18 that forms part of the heat medium circulation path 22 is inserted in the lower part of the hot water storage tank 14. The heat medium circulation path 22 circulates the heat medium (here, water) via the heat exchange pipe 18, the cistern 19, the water-water heat exchanger 20, and the solar heat collecting device 21. It is a route.

  Specifically, the heat medium circulation path 22 includes the first heat medium pipe 22 a extending from the outlet side of the heat exchange pipe 18 to the inlet side of the cistern 19 and the inlet of the water-water heat exchanger 20 from the outlet side of the cistern 19. The second heat medium pipe 22b extending to the side, the third heat medium pipe 22c extending from the outlet side of the water-water heat exchanger 20 to the inlet side of the heat collector 21, and for heat exchange from the outlet side of the heat collector 21. It consists of a fourth heat medium pipe 22d that reaches the entry side of the pipe 18. The heat collector 21 is a component of the hot water storage system 11, but may be an external device.

  The cistern 19 is a tank for storing a heat medium circulating in the heat medium circulation path 22. The cistern 19 is a tank that is open to atmospheric pressure, and absorbs volume fluctuations due to expansion and contraction of the heat medium. The cistern 19 includes a water level sensor 19a that detects the internal water level. The water level sensor 19a of this example includes a low water level detection electrode, a high water level detection electrode, and a common electrode.

  The water-water heat exchanger 20 has two pipes in close contact with each other over a predetermined length, and plays a role of transferring heat from a high temperature side pipe to a low temperature side pipe. The heat medium circulation path 22 is connected to the entry side and the exit side of one pipe line (in the figure, the inner pipe line 20a) of the water-water heat exchanger 20.

  A circulation pump 24 is provided in the middle of the third heat medium pipe 22c from the outlet side of the water-water heat exchanger 20 (inner pipe line 20a) to the inlet side of the heat collector 21. The circulation pump 24 sends the heat medium in the third heat medium pipe 22c to the heat collector 21 side. A switching valve 25 is inserted in the third heat medium pipe 22 c on the downstream side of the circulation pump 24. A third heat medium pipe 22c from the circulation pump 24 side is connected to the first connection port 25a of the switching valve 25, and a third heat medium reaching the heat collector 21 side is connected to the second connection port 25b of the switching valve 25. A pipe 22c is connected. One end of a connection pipe 26 is connected to the third connection port 25c of the switching valve 25, and the other end of the connection pipe 26 is a fourth heat medium pipe extending from the heat collecting device 21 to the entrance side of the heat exchange pipe 18. 22d is joined and connected in the middle.

  The heat collector 21 is provided with a high temperature sensor 51 that detects the temperature of hot water in the heat collector 21. Further, a heat medium temperature sensor 52 for detecting the temperature of the heat medium passing through the fourth heat medium pipe 22d on the heat exchanging pipe 18 side is provided in the middle of the joint connection place of the connecting pipe 26.

  The bath water heater 12 heats the hot water supplied from the water inlet to a set temperature and discharges it to the hot water supply pipe 13, and also heats the water supplied from the water inlet to the set temperature of the bath and pours it into the bathtub 3. A hot water filling function and a bath chasing function for chasing hot water in the bathtub 3 are provided.

  The recirculation path for circulating hot water during reheating is a pipe that passes through a bath return pipe 32 for taking hot water from the bathtub 3 into the bath water heater 12 and a heat exchanger 72 (see FIG. 2) in the bath water heater 12. The hot water heated through the heat exchanger 72 is sent to the bathtub 3 and the like. The bath outlet pipe 31 reaches the bathtub 3 via the other pipe line (outer pipe line 20b in the figure) of the water-water heat exchanger 20 on the way. The water-water heat exchanger 20 is a heat exchanger of the auxiliary heating device of the present invention, and bath water passes through the bath outlet pipe 31 with heat of the heat medium heated by the heat collecting device 21 during bathing. Play the role of moving to. The heat collecting device 21 and the heat medium circulation path 22 for circulating the heat medium heated by the heat collecting device 21 correspond to the heat source of the auxiliary heating device of the present invention.

  A bath temperature sensor 53 for detecting the temperature of the bath water heated by the bath water heater 12 and a bath high cut temperature are provided in the middle of the bath going pipe 31 from the bath water heater 12 to the water-water heat exchanger 20. A sensor 53b is provided.

  In addition, the connecting pipe 16 between the tank hot water temperature sensor 46 and the mixing valve 17 (first valve 17a) is provided with a hot water prohibiting electromagnetic valve 54 for switching between closing and opening of the connecting pipe 16. Further, two branch pipes branched from the connection pipe 16 are provided between the hot water prohibition solenoid valve 54 and the tank hot water temperature sensor 46, and a drain electromagnetic valve 55 is provided at one end of the branch pipe and the other branch pipe is provided. Is provided with a pressure relief valve 56. Further, a water filter, a pressure reducing valve, a check valve and the like are inserted in the water supply pipe 15.

  The hot water storage system 11 includes a control unit 60 that performs overall control of the operation of the hot water storage system 11. The control unit 60 temporarily stores a CPU (Central Processing Unit), a flash ROM (Read Only Memory) in which programs executed by the CPU, fixed data, and the like are stored, and various information when the CPU executes the programs. A RAM (Random Access Memory), an I / F (Interface) unit for inputting / outputting various signals, and the like are configured as circuits. Detection signals from various sensors of the hot water storage system 11 are input to the control unit 60. In addition, a control signal is output from the control unit 60 to the control target such as each valve and the circulation pump 24.

  The control unit 60 of the hot water storage system 11 exchanges necessary information with the control base 70 of the bath water heater 12. Here, the control unit 60 has information on the set temperature set on the bath water heater 12 side, information indicating whether or not the bath water heater 12 is in a chasing operation, and information indicating whether or not an automatic hot water filling is in progress. Are obtained from the bath water heater 12. Also, a signal for instructing combustion prohibition / permission and a signal for driving the bath circulation pump 85 (see FIG. 2) without burning the burner 73 (bath pump drive signal) are sent from the control unit 60 to the control board 70 of the bath water heater 12. Send to.

  FIG. 2 shows a schematic configuration of the bath water heater 12. The bath water heater 12 includes a hot water supply water pipe 72a in which a water inlet pipe 71 is connected to the outlet side and a hot water supply pipe 13 to the outlet side, and a bath outlet pipe 31 on the outlet side, and a bath return pipe 32 to the inlet side. A can-two-water channel heat exchanger 72 provided with a reheating water pipe 72b is provided. The starting end of the water intake pipe 71 is a water inlet to which the connection pipe 16 from the hot water storage system 11 side is connected.

  The heat exchanger 72 includes a large number of fins 72c for receiving heat from the burner 73 disposed below. A gas supply pipe 74 is connected to the burner 73. In the middle of the gas supply pipe 74, a gas valve 75 for switching supply / cutoff of gas, a proportional valve 76 for adjusting the amount of supply gas, and the like are provided.

  The hot water supply pipe 13 and the bath return pipe 32 are connected by a connecting pipe 77, and a pouring electromagnetic valve 78 that switches between closing and opening of the connecting pipe 77 is provided in the middle of the connecting pipe 77. Further, in the middle of the hot water supply pipe 13 upstream from the connection point of the connecting pipe 77, a water amount servo 79 capable of adjusting the opening degree from the closed state to the fully opened state is provided in order to adjust the amount of discharged hot water. A tapping temperature sensor 80 for detecting tapping temperature is provided on the downstream side of the water amount servo 79.

  Furthermore, a bypass pipe 81 branched from the water inlet pipe 71 and joined to and connected to the hot water supply pipe 13 at a predetermined location on the hot water supply water pipe 72a side from the water quantity servo 79 is provided. A bypass adjustment valve 82 capable of adjusting the degree is provided. The inlet pipe 71 upstream of the branching point of the bypass pipe 81 is provided with a flow rate sensor 83 that detects the flow rate of water in the inlet pipe 71 and an incoming temperature sensor 84 that detects the incoming water temperature. In addition, in the instrument which estimated the incoming water temperature by calculation, the incoming water temperature sensor 84 may not be provided.

  In the middle of the bath return pipe 32, there is provided a bath circulation pump 85 for circulating the water in the bathtub 3 through the reheating circulation path (the bath return pipe 32, the reheating water pipe 72b, the bath going-out pipe 31). . A flowing water switch 86 provided in the bath return pipe 32 detects whether water is actually circulating in the recirculation path when the bath circulation pump 85 is operated.

  In addition, a bath-out temperature sensor 87 and a bath-return temperature sensor 88 are provided in the bath-out tube 31 and the bath-return tube 32, respectively. A water-water heat exchanger 20 (outer pipe line 20 b) is inserted in the middle of the bath outlet pipe 31.

  The control board 70 includes a CPU, a flash ROM that stores programs executed by the CPU, fixed data, and the like, and a RAM that temporarily stores various types of information when the CPU executes programs. Has been. Various sensors, valves, bath circulation pumps 85 and the like that the bath water heater 12 has are connected to the control board 70.

  Further, an operation panel (remote control) 89 is connected to the control board 70 via wiring. The operation panel 89 includes switches for receiving various operations from the user, such as designation of a set temperature for hot water supply and a set temperature for a bath, instructions for starting and ending automatic hot water filling and reheating, and power on / off, and operation states. And a display unit for displaying the set temperature and the like.

  The control base 70 of the bath water heater 12 is configured so that the amount of combustion of the burner 73 and the bypass adjustment valve 82 are adjusted so that hot water at the hot water supply set temperature set by the user on the operation panel 89 is discharged in the hot water supply operation. Control the opening.

  In the reheating operation, the pouring electromagnetic valve 78 is closed, and the burner 73 is burned with the bath circulation pump 85 activated. Thereby, hot water in the bathtub 3 is taken into the bath water heater 12 through the bath return pipe 32 and heated by the heat exchanger 72, and the heated hot water is sent out to the bathtub 3 through the bath outlet pipe 31. Even when the bath water is heated by the water-water heat exchanger 20 during the reheating operation, the water-water heat exchanger 20 is inserted into the bath outlet pipe 31, so that the water-water heat exchanger 20 The heated hot water is poured into the bathtub 3 without passing through the bath water heater 12.

  In the automatic hot water filling operation in which hot water at a set temperature is filled in the bathtub 3 at the set water level, first, it is confirmed whether or not there is bathtub water in the bathtub 3, and if the bathtub water does not remain, The pouring operation is performed with the amount of water in the bathtub 3 (known) as the necessary pouring amount.

  When bathtub water remains, the remaining water amount is calculated, and the amount of hot water (residual water) remaining in the bathtub 3 is obtained. In the calculation of the remaining water amount, a chasing operation is temporarily performed. For example, a chasing operation is performed until the bath water (residual water) rises to a set temperature, and the amount of heat given to the bath water (residual water) during the chasing operation and the bath water (residual water) before and after the heat amount is given. ) To calculate the amount of residual water.

  Then, a value obtained by subtracting the remaining water amount obtained by calculating the remaining water amount from the water amount at the set water level is set as a necessary pouring amount, and the pouring operation is performed so as to pour the hot water of this pouring amount into the bathtub 3.

  In the hot water pouring operation, the control board 70 opens the hot water solenoid valve 78 and the water amount servo 79 in a state where the burner 73 is burned, so that hot water heated through the hot water pipe 72a of the heat exchanger 72 is heated. Then, it is fed out to the connecting pipe 77 and poured into the bathtub 3 through both the bath return pipe 32 and the bath outlet pipe 31. At this time, the control board 70 controls the combustion amount of the burner 73, the opening degree of the bypass adjustment valve 82, and the like so that hot water having a bath set temperature set by the user on the operation panel 89 is poured. Further, when the water level in the bathtub 3 reaches the set water level, the pouring operation is stopped, and thereafter, the reheating operation is performed until the bathtub water in the bathtub 3 rises to the set temperature.

  The burner 73 of the bath water heater 12 cannot be burned below a predetermined minimum heating amount (minimum number). Therefore, the control base 70 of the bath water heater 12 controls the burner 73 to be in a state where the burner 73 is burned off when the heating amount necessary for discharging hot water at the set temperature is smaller than the minimum heating amount. The necessary amount of heating is calculated based on the temperature difference between the set temperature and the incoming water temperature detected by the incoming water temperature sensor 84, the flow rate detected by the flow sensor 83, the thermal efficiency, and the like.

  Next, various operations of the hot water storage system 11 will be described.

<Heat collection operation>
FIG. 3 shows a schematic operation of the heat collecting operation performed by the hot water storage system 11. The heat collecting operation is an operation of heating the water in the hot water storage tank 14 using heat obtained from sunlight by the heat collecting device 21. The heat collection operation is performed when an operation condition is satisfied such that the temperature detected by the high temperature sensor 51 of the heat collection device 21 is higher than the water temperature in the hot water storage tank 14 (the temperature detected by the first temperature sensor 41) by a certain temperature or more.

  The hot water storage tank 14 receives supply of water from a water supply pipe 15 connected to a pipe connection port at the bottom, and is normally in a full state. During the heat collecting operation, the control unit 60 sets the switching valve 25 in a state where the first connection port 25a and the second connection port 25b communicate with each other and closes the third connection port 25c, and then drives the circulation pump 24. .

  In FIG. 3, the path through which the heat medium (water) circulates in the heat collecting operation is indicated by a bold line. The direction in which the heat medium flows in each part is indicated by arrows. Specifically, the heat medium in the cistern 19 flows toward the heat collector 21 through the second heat medium pipe 22 b, the third heat medium pipe 22 c, and the like by the action of the circulation pump 24 and passes through the heat collector 21. Then, the temperature is raised and circulated so as to return from the fourth heat medium pipe 22d through the heat exchange pipe 18 in the hot water storage tank 14 to the systern 19. When the water temperature in the hot water storage tank 14 is lower than the heat medium passing through the heat exchange pipe 18, the heat of the heat medium moves to the water in the hot water storage tank 14 through the heat exchange pipe 18 and the water in the hot water storage tank 14 is heated. Is done.

  The heat exchange pipe 18 is located below the hot water storage tank 14, and water is supplied from the bottom of the hot water storage tank 14, and hot water flows out from the ceiling of the hot water storage tank 14 to the connection pipe 16. Has a lower temperature and a higher temperature gradient at the ceiling.

<Hot water supply operation>
FIG. 4 shows a schematic operation of the hot water supply operation. In FIG. 4, a path through which hot water flows in the hot water supply operation is indicated by a thick line. The direction in which hot water flows in each part is indicated by arrows. In the hot water supply operation, hot water from the hot water storage tank 14 and water from the branch water supply pipe 15a are mixed by the mixing valve 17 and supplied to the water inlet (water inlet pipe 71) of the bath water heater 12. The bath water heater 12 heats the supplied water as needed and discharges it to the hot water supply pipe 13.

  Specifically, when hot water having a temperature higher than the set temperature of hot water is sufficiently accumulated in the upper part of the hot water storage tank 14, the hot water is discharged without burning the burner 73 of the bath water heater 12. That is, considering the amount of cooling while passing through the bath water heater 12, hot water from the hot water storage tank 14 and water from the branch water supply pipe 15a are mixed by the mixing valve 17 so that the temperature is slightly higher than the set temperature of the hot water. The hot water is supplied to the water inlet of the bath water heater 12. As a result, the bath water heater 12 determines that heating in its own device is unnecessary, and performs hot water discharge without burning the burner 73.

  When the temperature of the hot water stored in the upper part of the hot water storage tank 14 is lower than the set temperature for hot water, hot water having a temperature lower than the set temperature by a certain level or more is supplied from the mixing valve 17 to the water inlet of the bath water heater 12. Thereby, the bath water heater 12 burns the burner 73 so that the hot water is discharged at the set temperature. Since the burner 73 of the bath water heater 12 cannot burn below the minimum combustion amount, the temperature of the hot water supplied from the mixing valve 17 to the bath water heater 12 is the case where the burner 73 of the bath water heater 12 burns at the minimum combustion amount. It is controlled so that the tapping temperature is less than the set temperature.

  Next, the relationship between the operation of the hot water storage system 11 and the reheating operation in the bath water heater 12 will be described.

  FIG. 5 shows a path through which bath water flows during the chasing operation. In the chasing operation, the bathtub water in the bathtub 3 is taken into the bath water heater 12 through the bath return pipe 32 and heated by the heat exchanger 72 of the bath water heater 12. The heated bathtub water flows from the bath water heater 12 through the bath outlet pipe 31, and flows out to the bathtub 3 through the outer conduit 20 b of the water-water heat exchanger 20 on the way.

  When the bath water heater 12 performs such a bathing operation during the above-described heat collecting operation, the bath water is heated when passing through the water-water heat exchanger 20. If the water-water heat exchanger 20 is inserted in the bath return pipe 32, the bath water heated by the water-water heat exchanger 20 returns directly to the bath water heater 12 through the bath return pipe 32. Therefore, the water temperature detected by the bath return temperature sensor 88 of the bath water heater 12 is higher than the temperature of the bathtub water in the bathtub 3. As a result, the controller 70 of the bath water heater 12 erroneously determines that the bath water in the bath 3 has actually reached the set temperature, but terminates the chasing operation. End up.

  By inserting the water-water heat exchanger 20 into the bath outlet pipe 31 as in the present embodiment, the above problem is solved. That is, the bathtub water heated by the water-water heat exchanger 20 is poured into the bathtub 3 through the bath outlet pipe 31 and mixed with the entire bathtub water in the bathtub 3. Since the bath return temperature sensor 88 of the bath water heater 12 detects the temperature of the bath water taken from the bath 3 through the bath return pipe 32, the above-described erroneous determination does not occur. As a result, the bath water heater 12 can normally perform the bath reheating operation even when the water-water heat exchanger 20 is heated.

  Next, the relationship between the operation of the hot water storage system 11 and the remaining water amount calculation in the bath water heater 12 will be described.

  If the water-water heat exchanger 20 is inserted in the bath return pipe 32, if the water-water heat exchanger 20 is hot when the bath water heater 12 starts calculating the remaining water amount. The bathtub water heated by the water-water heat exchanger 20 returns directly to the bath water heater 12 through the bath return pipe 32. For this reason, the detected temperature of the bath return temperature sensor 88 of the bath water heater 12 is higher than the temperature of the bathtub water in the bathtub 3, and the temperature of the bathtub water actually in the bathtub 3 cannot be detected. Therefore, accurate residual water amount calculation cannot be performed.

  Further, if the heat collecting operation is continued during the reheating operation for calculating the remaining water amount, the bath water is heated by the water-water heat exchanger 20, but the amount of heat in the bath water heater 12 is increased. Since it is not reflected in the residual water amount calculation, the residual water amount cannot be calculated correctly.

  In the present invention, the water-water heat exchanger 20 is configured to be inserted in the bath outlet pipe 31, and the heat collecting operation is stopped while the bath water heater 12 performs the reheating operation for calculating the remaining water amount. Therefore, the above problem does not occur. Hereinafter, this point will be described in detail.

  The control unit 60 of the hot water storage system 11 stops the heat collecting operation when it detects that the bath water heater 12 has started the calculation of the remaining water amount (starting the reheating operation). For example, by receiving an ON signal of the bath circulation pump 85 from the bath water heater 12, it is detected that the bath water heater 12 has started a reheating operation. Alternatively, the detection temperature of the bath temperature sensor 53 provided in the bath outlet pipe 31 between the water-water heat exchanger 20 and the bath water heater 12 or the detection temperature of both the bath temperature sensor 53 and the bath high cut temperature sensor 53b is Due to the sudden rise, it is detected that the bath water heater 12 has started a chasing operation.

  If the water-water heat exchanger 20 is already in a hot state due to the heat collection operation up to that time when the reheating operation for calculating the remaining water amount is started, the bath water in the bath outlet pipe 31 is water. -Heated by the water heat exchanger 20 and poured into the bathtub 3 and mixed with the entire bathtub water in the bathtub 3. Since the heat collecting operation is stopped after the reheating operation for calculating the remaining water amount is started, the water-water heat exchanger 20 is cooled after a while from the start of the reheating operation, and the water-water heat exchanger 20 is cooled. The bath water heating is finished. Therefore, after a while from the start of the reheating operation for calculating the remaining water amount, the heat applied from the water-water heat exchanger 20 at the beginning is reflected in the temperature of the entire bathtub water in the bathtub 3.

  If an actual residual water amount calculation is performed after this state (a stable state) is reached, an accurate residual water amount calculation is possible. That is, if the remaining water amount is calculated from the temperature of the bath water after becoming stable, the amount of heating by the bath water heater 12 thereafter, and the temperature of the bath water after heating, the water-water heat exchanger 20 The amount of residual water can be calculated correctly without being affected by the heat.

  Here, the bath water heater 12 is controlled so that the remaining water amount calculation is not performed since the variation of the remaining water amount calculation value is large for a certain period from the start of the chasing operation. FIG. 6 is a graph showing the relationship between the rising temperature and the residual water amount calculation value when the residual water amount calculation is performed every time the temperature of the residual water increases by a unit temperature (0.6 ° C. here). In FIG. 6, each graph in five experiments is shown. As can be seen from the graph in the figure, for a while after the temperature of the remaining water began to rise (at the beginning of reheating), the variation in the remaining water amount calculation value was large, and after the temperature rose to some extent, the calculated remaining water amount value The variation of is reduced. For this reason, the bath water heater 12 is controlled not to calculate the remaining water amount until the temperature rises above a certain level from the start of reheating (see, for example, Japanese Patent No. 3748596). The period during which the remaining water amount calculation is restricted from the start of reheating is several minutes (3 to 4 minutes), which is sufficiently longer than the time until the above-described stable state is reached.

  As described above, the bath water heater 12 normally performs the remaining water amount calculation after reaching the above-described stable state, so that the water-water heat exchanger 20 is inserted into the bath outlet pipe 31 to calculate the remaining water amount. By performing control so as to stop the heat collecting operation during the chasing operation for the purpose, the remaining water amount calculation by the bath water heater 12 is performed correctly. That is, the heat initially possessed by the water-water heat exchanger 20 is included in the initial bath water temperature, and the heat collecting operation is stopped during the reheating operation. An accurate remaining water amount can be calculated from the temperature difference from the bath water temperature after heating by the sowing operation and the heating amount by this chasing operation.

  Next, how to use the water-water heat exchanger 20 will be described.

<Solar chasing operation>
FIG. 7 shows a schematic operation of the solar reheating operation. The solar reheating operation is an operation in which hot water in the bathtub 3 is supplementarily replenished using heat obtained from sunlight by the heat collecting device 21.

  In the solar reheating operation, the control unit 60 sets the switching valve 25 in a state where the first connection port 25a communicates with the second connection port 25b and closes the third connection port 25c, and then drives the circulation pump 24. To do. That is, the heat medium is circulated in the same manner as in the heat collection operation, and the heat medium is heated by the heat collection device 21. Furthermore, in the solar reheating operation, the control unit 60 instructs the bath water heater 12 to drive the bath circulation pump 85 in a state where combustion (heating operation) is stopped.

  In FIG. 7, the path through which the heat medium (water) circulates in the solar reheating operation is indicated by a bold line. Moreover, the circulation path of bathtub water is shown with the thick broken line. Furthermore, the direction in which the heat medium flows and the direction in which the bath water flows are indicated by arrows in each part. In the solar reheating operation, the operation condition is that the temperature of the heat medium circulating in the heat medium circulation path 22 is higher than the temperature of the bath water, and the water-water heat exchanger 20 passes through the inner pipe line 20a. The bathtub water is heated by heat moving from the heat medium to the bathtub water passing through the outer pipe line 20b.

<Bath heat recovery operation>
FIG. 8 shows a schematic operation of the bath heat recovery operation. The bath heat recovery operation is an operation of heating the hot water in the hot water storage tank 14 using the heat of the remaining hot water in the bath.

  In the bath heat recovery operation, the control unit 60 sets the switching valve 25 in a state where the first connection port 25a and the third connection port 25c communicate with each other and the second connection port 25b is closed, and then drives the circulation pump 24. To do. As a result, the heat medium circulates through the water-water heat exchanger 20 and the hot water storage tank 14 without passing through the heat collector 21. Further, the bath water heater 12 is instructed to drive the bath circulation pump 85 in a state where combustion (heating operation) is stopped. As a result, the bathtub water circulates in the recirculation circulation path including the outer conduit 20 b of the water-water heat exchanger 20.

  In FIG. 8, the path through which the heat medium (water) circulates in the bath heat recovery operation and the circulation path of the bath water are indicated by bold lines. Moreover, the circulation path of bathtub water is shown with the thick broken line. Furthermore, in each part, the direction in which the heat medium flows and the direction in which the bathtub water flows are indicated by arrows. The bath heat recovery operation is operated under the condition that the water temperature in the hot water storage tank 14 (first temperature sensor 41) is lower than the water temperature in the bathtub 3, and the water-water heat exchanger 20 passes through the outer conduit 20b. Heat moves from the bathtub water to the bathtub water passing through the inner pipe line 20a, and this heat moves to the water in the hot water storage tank 14 through the heat exchange pipe 18, whereby the water in the hot water storage tank 14 is heated. Thereby, the burden of heat collection operation is reduced.

  More specifically, in the bath heat recovery operation, first, the bath circulation pump 85 is temporarily activated to check whether there is bathtub water. Then, when there is bathtub water and the temperature of the bathtub water is higher than the temperature detected by the first temperature sensor 41 by a predetermined temperature (for example, 15 ° C.) or more, the bath heat recovery operation is performed, and the difference is 10 ° C. or less or 1 hour. If it exceeds, driving is stopped. The time limit is based on the durability of the bath circulation pump 85.

<Others>
When the bath water heater 12 performs a reheating operation without performing the remaining water amount calculation, the bath water is heated by the water-water heat exchanger 20 by performing the same operation as the solar reheating operation described above. In the normal solar reheating operation, the control unit 60 instructs the bath water heater 12 to drive the bath circulation pump 85 in a state where combustion (heating operation) is stopped. Do not give instructions.

  For example, if it is a fully automatic bath water heater of the type which detects a water level with a pressure sensor, the above-mentioned solar reheating operation can be performed during reheating operation, and bath water can be auxiliary-heated. In addition, when the bath water heater 12 performs a chasing operation with a remaining water amount calculation and a chasing operation without a remaining water amount calculation, determination information as to whether or not the bath water heater 12 is a chasing operation with a remaining water amount calculation is used. What is necessary is just to make it use the said solar renewal driving | operation together at the time of the reheating operation | movement which is received from the water heater 12 and does not involve the remaining water amount calculation.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  In embodiment, although the example in case an auxiliary heating apparatus is the hot water storage system 11 was shown, the auxiliary heating apparatus of this invention is not limited to this. For example, an auxiliary heating device having a configuration in which a fuel cell is used as a heat source, a heat exchanger that recovers the exhaust heat is provided, and the heat exchanger is inserted in the middle of the bath outlet pipe 31 may be used. The heat source may be arbitrary, and the heat exchanger may be appropriately selected according to the type of the heat source.

  The bath water heater that cooperates with the auxiliary heat source device of the present invention is not limited to that exemplified in the embodiment. For example, a bath water heater of the type that detects the water level with a pressure sensor may be used. Since this type does not calculate the amount of remaining water, it is not necessary to stop the heat collecting operation (heating of the heat exchanger by the heat source) during automatic filling or reheating.

  In the embodiment, the hot water storage system 11 is assumed to be diverted from an existing hot water heater, but the hot water storage system 11 may include a dedicated bath water heater 12. In this case, since the control unit 60 of the hot water storage system 11 can grasp the operation state of the bath water heater 12 in detail, for example, the reheating operation with the remaining water amount calculation or the reheating operation without the remaining water amount calculation is performed. Or the like can be easily determined.

  In the embodiment, the bath water heater 12 is a single-can two-water channel type, but it may be a water heater that performs separate bathing and hot water supply using separate heat exchangers.

DESCRIPTION OF SYMBOLS 3 ... Bathtub 10 ... Hot water supply system 11 ... Hot water storage system 12 ... Hot water supply device 13 ... Hot water supply pipe 14 ... Hot water storage tank 15 ... Water supply pipe 15a ... Branch water supply pipe 16 ... Connection pipe 17 ... Mixing valve 17a ... First valve 17b ... Second valve DESCRIPTION OF SYMBOLS 18 ... Piping for heat exchange 19 ... Systurn 19a ... Water level sensor 20 ... Water-water heat exchanger 20a ... Inner pipe line 20b ... Outer pipe line 21 ... Heat collecting device 22 ... Heat-medium circulation path 22a ... First heat-medium pipe 22b 2nd heat medium pipe 22c ... 3rd heat medium pipe 22d ... 4th heat medium pipe 24 ... Circulation pump 25 ... Switching valve 25a ... 1st connection port 25b ... 2nd connection port 25c ... 3rd connection port 26 ... Connection pipe DESCRIPTION OF SYMBOLS 31 ... Bath going pipe 32 ... Bath return pipe 41 ... 1st temperature sensor 42 ... 2nd temperature sensor 43 ... 3rd temperature sensor 44 ... 4th temperature sensor 46 ... Tank hot water temperature sensor 47 ... Supply water temperature Sensor 48 ... Water volume sensor 49 ... Mixing temperature sensor 51 ... High temperature sensor 52 ... Heat medium temperature sensor 53 ... Bath temperature sensor 53b ... Bath high cut temperature sensor 54 ... Outlet solenoid valve 55 ... Drain solenoid valve 56 ... Pressure relief valve 60 ... Control Unit 70 ... Control base 71 ... Inlet pipe 72 ... Heat exchanger 72a ... Hot water supply water pipe 72b ... Additional cooking water pipe 72c ... Fin 73 ... Burner 74 ... Gas supply pipe 75 ... Gas valve 76 ... Proportional valve 77 ... Connecting pipe 78 ... Molten water solenoid valve 79 ... Servo servo 80 ... Hot water temperature sensor 81 ... Bypass pipe 82 ... Bypass adjustment valve 83 ... Flow rate sensor 84 ... Incoming water temperature sensor 85 ... Bath circulation pump 86 ... Running water switch 87 ... Bathing temperature sensor 88 ... Bath return Temperature sensor 89 ... Control panel (remote control)

Claims (3)

The bath pot equipped with a bath reheating function for heating the bathtub water taken from the bathtub through the bath return pipe and returning the heated bathtub water to the bathtub through the bath return pipe to raise the temperature of the bathtub water in the bathtub. A heat exchanger to be inserted in the middle of the bath outlet pipe,
A heat source for heating the heat exchanger;
I have a,
When the remaining amount of water is calculated from the amount of heat applied to the bath water and the amount of temperature rise of the bath water due to this heating, the heating of the heat exchanger by the heat source unit is stopped when the remaining amount of water is calculated. An auxiliary heating device characterized by that. A hot water storage tank,
A heat collecting device for collecting solar heat;
A radiator for heating the hot water in the hot water storage tank;
A circulation path of a heat medium fluid formed between the heat collector and the radiator;
A pump for circulating a heat medium fluid between the heat collecting device and the radiator through the circulation path;
With
Said heat exchanger, said interposed in the middle of the circulation path, Ri heat exchanger der to transfer heat between the bath water through the heat medium fluid and the bath forward pipe through the circulation path,
The said pump is stopped when the said bathtub performs the residual water amount calculation which calculates the amount of water of bathtub water from the amount of heat added to bathtub water, and the temperature rise amount of bathtub water by this heating. Auxiliary heating device described in 1.   The bath pot equipped with a bath reheating function for heating the bathtub water taken from the bathtub through the bath return pipe and returning the heated bathtub water to the bathtub through the bath return pipe to raise the temperature of the bathtub water in the bathtub. A heat exchanger to be inserted in the middle of the bath outlet pipe,
  A hot water storage tank,
  A heat collecting device for collecting solar heat;
  A radiator for heating the hot water in the hot water storage tank;
  A circulation path of a heat medium fluid formed between the heat collector and the radiator;
  A pump for circulating a heat medium fluid between the heat collecting device and the radiator through the circulation path;
  With
  The heat exchanger is a heat exchanger that is inserted in the middle of the circulation path and moves heat between the heat medium fluid passing through the circulation path and the bath water passing through the bath outlet pipe,
  When the remaining amount of water is calculated from the amount of heat applied to the bath water and the amount of temperature rise of the bath water due to this heating, the pump is stopped when the remaining amount of water is calculated.
  An auxiliary heating device characterized by that.

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