JP5391023B2 - Bath heating combined device - Google Patents

Description

  The present invention relates to a combined bath-heating apparatus having a function of reheating bath water and a heating function of a heating device.

  Conventionally, various bath heating combined devices have been proposed (for example, see Patent Document 1). FIG. 11 is a schematic diagram illustrating an example of a combined bath heating apparatus. The bath heating complex apparatus shown in the figure has a hot water supply side circuit 50, a liquid circulation passage 4 of a heating apparatus such as a hot water mat 15, and a recirculation circulation path 25 connected to a bathtub 27. The recirculation circulation path 25 and the liquid circulation path 4 are thermally connected via the heat exchange means 20. The heat exchange means 20 is formed by a liquid-liquid heat exchanger.

  The recirculation circulation passage 25 is provided with a bathtub hot water circulation pump 21 that circulates the bathtub hot water. The recirculation circulation passage 25 includes a return-side passage 23 extending from the bathtub 27 to the inlet of the heat exchanging means 20, and heat. And a forward passage 24 extending from the exit side of the exchange means 20 to the bathtub 27. The forward side passage 24 is provided with a thermistor 12 that detects the temperature of hot water passing through the forward side passage, and the return side passage 23 is provided with the thermistor 11. The thermistor 11 also functions as a bathtub hot / cold water temperature detecting means for detecting the hot / cold water temperature passing through the return side passage 23 and detecting the temperature of the hot / cold bathtub water. Further, the return side passage 23 is provided with a water level sensor 26 as water level detecting means for detecting the water level of the bathtub hot water.

  The liquid circulation passage 4 is provided with a reheating / heating heat exchanger 17. The reheating / heating heat exchanger 17 performs an operation of heating hot water passing through the liquid circulation passage 4 by combustion of the burner 16. By this heating operation, the reheating / heating heat exchanger 17 has a function as a heating device for heating the heating device to a set temperature, and heat of the hot water passing through the liquid circulation passage 4 is transferred to the heat exchange means 20. It has a function of heating hot water passing through the recirculation circulation passage 25 by transmitting it to the recirculation circulation passage 25 via. Details of these heating and reheating operations will be described later.

  A passage 31 is connected to the incoming side (incoming water side) of the reheating / heating heat exchanger 17, and a pipe line 32 is connected to the outgoing side (outflow side) of the reheating / heating heat exchanger 17. The pipe line 31 and the pipe line 32 are connected to the pipe lines 33 to 37 via the heating system turn 45. The pipe 33 is connected to the inlet side of the heat exchanging means 20, and an electromagnetic valve 29 is interposed in the pipe 33. One end side of a pipe line 34 is connected to the outlet side of the heat exchange means 20, and a pipe line 35 is connected to the other end side of the pipe line 34. A heating system 45 is interposed between the pipe 35 and the pipe 36, and the pipe 36 is connected to the suction side of the liquid circulation pump 19 that circulates the liquid in the liquid circulation passage 4. The pipe 31 is connected to the discharge side of the liquid circulation pump 19, and the thermistor 18 for detecting the temperature of hot water entering the heating heat exchanger 17 through the liquid circulation path 4 is provided in the pipe 31. It has been.

  Further, a liquid branching means 43 is connected to the pipe line 31 via a pipe line 39, and the valve 30 is provided in the liquid branching means 43. A pipe 40 is connected to the liquid branching means 43, and the pipe 40 is connected to the inlet side of a low-temperature heating device such as the hot water mat 15. A pipeline 41 is connected to the outlet side of the low-temperature heating device, and the pipeline 41 is connected to the pipeline 35 via a liquid confluence means 44. A pipe 38 is connected to the pipe 32, and a pipe 37 that connects the pipe 38 and the pipe 35 is provided. An inlet side of the high-temperature heating apparatus is connected to the pipe line 38, a pipe line 42 is connected to the outlet side of the high-temperature heating apparatus, and the pipe line 42 is connected to the liquid merging means 44.

  The hot water supply side circuit 50 is connected to a hot water supply heat exchanger 47 heated by combustion of the burner 46, an inlet side of the hot water supply heat exchanger 47, a water supply passage 48 for guiding water from a water supply source, A hot water supply passage 49 that is connected to the outlet side of the heat exchanger 47 and guides hot water to a hot water supply destination is provided. Combustion of the burners 16 and 46 is performed using fuel gas supplied from a gas pipe (not shown) and air supplied along with the rotation of the combustion fan. Since there is, detailed description is abbreviate | omitted.

  The hot water supply passage 49 is connected to the recirculation circulation passage 25 through a pouring passage (not shown), and hot water heated through the hot water supply heat exchanger 47 is connected to the hot water supply passage 49, the pouring passage, An automatic hot water filling function may be provided in which the hot water is automatically poured into the bathtub 27 by filling the circulating circulation passage 25 in order.

  When the bath heating / water replenishment operation is performed by this bath heating complex apparatus, as shown in FIG. 12, the electromagnetic valve 29 is opened and the liquid circulation pump 19 is driven to allow the liquid in the liquid circulation passage 4 to flow through the pipe 31. The recirculation / heating heat exchanger 17, the pipe 32, the pipe 33, the heat exchange means 20, the pipe 34, the pipe 35, the heating system 45, and the pipe 36 are circulated in this order. At this time, the hot water circulation pump 21 is also driven on the side of the recirculation circulation passage 25, and the hot water in the bathtub passes through the recirculation circulation passage 25 in the order of the return side passage 23, the heat exchange means 20, and the outward passage 24. Circulate. As a result, the liquid passing through the liquid circulation passage 4 and the bathtub hot water passing through the recirculation circulation passage 25 are heat-exchanged via the heat exchanging means 20, so that the bath hot water is replenished.

  Further, when performing low-temperature heating operation of the hot water mat 15 or the like, as shown in FIG. 13, the electromagnetic valve 29 is closed and the liquid circulation pump 19 is driven, so that the liquid in the liquid circulation passage 4 is replenished to the pipeline 31. While circulating the heating / heating heat exchanger 17, the pipe 32, the pipe 37, the pipe 35, the heating system 45, and the pipe 36 in this order, the hot water passing through the pipe 31 is circulated through the pipe 39 through the liquid branching means 43. It branches to the side and it circulates in order of the pipe line 40, the warm water mat 15, the pipe line 41, the liquid confluence means 44, and the pipe line 35. The hot water passing through the hot water mat 15 side and the hot water passing through the reheating / heating heat exchanger 17 are merged at the junction 28.

  When operating the high-temperature heating device, the valve provided in the high-temperature heating device is opened, and hot water passing through the pipe line 32 passes through the pipe line 38 and is heated at a high temperature as shown by the broken line arrow in FIG. After being supplied to the apparatus side and passing through the high-temperature heating apparatus, the liquid merge means 44 merges through the pipe line 42.

JP-A-8-35675

  By the way, the remaining hot water in the home bath is generally either thrown away after bathing or left as it is until the next morning and used for washing the next day. Heat energy was wasted. Therefore, in Patent Document 1, by using the remaining hot water of the bath and circulating the remaining hot water in the circulation passage 25, the liquid in the liquid circulation passage 4 is circulated and heat exchange is performed by the heat exchanging means 20. It has been proposed to warm the liquid circulating in the liquid circulation passage 4 with the heat of the remaining hot water.

  However, the invention described in Patent Document 1 merely proposes heating the liquid in the liquid circulation passage 4 using the remaining hot water of the bath, and the details of the operation method are proposed. Not done. The temperature of the remaining hot water in the bath is about 40 ° C at most even after the person has finished bathing. Even if the heat of the remaining hot water is used, if the usage is not appropriate, sufficient energy saving ( It is thought that energy saving) cannot be achieved.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a bath heating composite apparatus that can efficiently save energy by utilizing the heat of the remaining hot water in the bath. .

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first invention has a recirculation circulation passage connected to the bathtub, and the recirculation circulation passage is provided with a bathtub hot water circulation pump for circulating the bathtub hot water, and detects the temperature of the bathtub hot water. Bath water temperature detecting means, and water level detecting means for detecting the water level of the bathtub hot water, the recirculation circulation passage and the liquid circulation passage of the heating device are thermally connected via heat exchange means, A bath heating complex apparatus provided with a liquid circulation pump for circulating a liquid in the liquid circulation passage in the liquid circulation passage, wherein the bath hot water temperature detecting means receives the heating preheating command for using the remaining hot water in the bathtub Bathtub hot water retained heat amount calculating means for obtaining the amount of heat stored in the bathtub hot water based on the value and the detected value of the water level detecting means, and time information from the receipt of the heating preheating command to the heating operation start reservation time of the heating device Preheating number determination means for determining the number of times of preheating operation for intermittently preheating the heating device based on predetermined constant or time variable operation time information determined in advance, and the preheating number determination means Preheating calorific value calculation means for obtaining a preheating heat quantity per one time that can preheat the heating apparatus based on the retained heat quantity based on the number of times of preheating operation of the heating apparatus and the retained hot water quantity obtained by the bathtub hot water retained heat quantity detecting means. And the bath hot water circulation pump and the liquid circulation pump are operated on the basis of the preheating heat quantity obtained by the preheating calorie calculating means, and the bath hot water and the liquid circulation passage passing through the recirculation circulation passage are operated. Heat-preheating system using remaining hot water that exchanges heat with the passing liquid through the heat exchanging means, and heats the liquid that passes through the liquid circulation passage by the amount of heat stored in the bathtub hot water. And a means for solving the problems with the structure and means.

  Further, in the second invention, in addition to the configuration of the first invention, the recirculation circulation passage extends from the bathtub to the inlet of the heat exchange means and from the outlet side of the heat exchange means to the bathtub. A remaining hot water heating / heating preheating control means including a return hot water temperature flowing from the return side passage to the heat exchange means and a forward hot water flowing from the heat exchange means to the forward passage side. Based on the temperature difference from the temperature and the information on the bathtub hot water flow rate that flows by driving the bathtub hot water circulation pump, the exhaust heat recovery per use of the remaining hot water that heats the liquid passing through the liquid circulation passage by the amount of heat stored in the bathtub hot water The heat amount is calculated, and the bath hot water circulation pump is driven until the exhaust heat recovery heat amount reaches the preheating heat amount per one time.

  Further, in the third invention, in addition to the configuration of the first invention, the remaining hot water using heating preheating control means is a liquid according to the retained heat amount of the bathtub hot water based on the temperature of the bathtub hot water and the information on the amount of the hot water. The exhaust heat recovery heat amount per use of the remaining hot water for heating the liquid passing through the circulation passage is calculated, and the bath hot water circulation pump is driven until the exhaust heat recovery heat amount reaches the preheat heat amount per time. It is characterized by having a configuration.

  Furthermore, in addition to the structure of the said 1st, 2nd or 3rd invention, 4th invention heats the liquid which passes through the said liquid circulation path in the said liquid circulation path in order to heat a heating apparatus to preset temperature. A heating heater is connected, and a bypass passage for circulating the liquid without passing through the heating heater is provided in the liquid circulation passage, and the liquid is supplied to the liquid circulation passage through the bypass passage. Route switching means for switching between a route for circulation and a route for circulating the liquid in the liquid circulation passage through the heating apparatus for heating is provided.

  According to the present invention, the reheating circulation passage connected to the bathtub and the liquid circulation passage of the heating device are thermally connected via the heat exchange means in the bath heating composite device, and the remaining hot water in the bathtub is used. By the following operation after receiving the heating preheating command, the heat of the remaining hot water can be efficiently used for preheating the liquid circulation passage of the heating device. That is, in the present invention, in response to the heating preheating command, the bathtub hot water retained heat amount calculation means obtains the retained heat amount of the bathtub hot water, and the preheating operation frequency determination means determines the number of times of intermittently preheating the heating device, Based on the stored heat amount, the preheating heat amount calculating means obtains a preheating heat amount per time at which the heating device can be preheated based on the stored heat amount, and based on the heat amount value, the remaining hot water using heating preheat control means is used for the bathtub. Operate the hot water circulation pump and liquid circulation pump.

  By this operation, for example, the bath water passing through the recirculation circulation passage and the liquid passing through the liquid circulation passage are intermittently subjected to heat exchange via the heat exchange means between the time when a person takes a bath and the next morning. can do. In other words, the present invention, for example, keeps operating the bathtub hot water circulation pump and the liquid circulation pump immediately after bathing, so that the amount of heat stored in the bath hot water is exchanged with hot water in the liquid circulation passage within a short time immediately after bathing by a person. It is possible to suppress the fact that the amount of heat stored in the bathtub hot water cannot be used the next morning, and at the scheduled heating operation start time of the heating device, the temperature of the hot water passing through the liquid circulation passage is efficiently increased and heating is performed. Energy saving can be achieved by reducing the load at the start of operation.

  Further, the difference between the temperature of the passage from the bathtub to the entrance side of the heat exchange means (return hot water temperature) and the temperature of the passage from the exit side of the heat exchange means to the bathtub (outward hot water temperature) in the recirculation circulation passage, and the bath hot water By calculating (accumulating) the exhaust heat recovery heat amount per use of the remaining hot water that heats the liquid that passes through the liquid circulation passage based on the stored heat amount of the bathtub hot water based on the information on the bathtub hot water flow that flows by driving the circulation pump In addition, the exhaust heat recovery heat amount per use of the remaining hot water can be accurately calculated.

  Similarly, based on the temperature drop of the bathtub hot water temperature and the information on the amount of hot water in the bathtub, the exhaust heat recovery heat amount per use of the remaining hot water that heats the liquid passing through the liquid circulation passage is calculated (accumulated) based on the amount of heat stored in the bathtub hot water. By doing so, the exhaust heat recovery heat quantity per use of the remaining hot water can be accurately calculated.

  Therefore, by accurately obtaining the exhaust heat recovery heat amount per time, and driving the bathtub hot water circulation pump until the exhaust heat recovery amount reaches the pre-heating heat amount per time as described above, The amount of heat exchange between the hot water in the bathtub and the liquid passing through the liquid circulation passage can be set as the amount of heat for preheating, and appropriate heat exchange can be performed. Therefore, by using the remaining hot water in the bathtub, the hot water passing through the liquid circulation passage is used. Heating operation with low load (low output) can be performed at night by raising the temperature, and energy saving can be achieved by reducing the load at the start of heating operation in the morning.

  Further, the liquid is circulated through the liquid circulation passage through the passage for circulating the liquid through the liquid circulation passage through the heating heater provided in the liquid circulation passage and the bypass passage for circulating the liquid without passing through the heating heater. When the liquid passing through the liquid circulation passage is heated by using the heat of the remaining hot water in the bathtub, the liquid circulation passage is circulated by circulating the liquid without passing through the heating device. The liquid inside can be warmed more efficiently.

It is a block diagram which shows the control structure of 1st Example of the bath heating complex apparatus which concerns on this invention. It is an image figure which shows the example of the load at the time of the heating preheating operation | movement using the remaining hot water of the bathtub in the bath heating composite apparatus of 1st Example, and the timer reservation heating start with the graph of target (or setting) room temperature. It is an image figure which shows another example of the load at the time of the heating preheating operation | movement using the remaining hot water of the bathtub in the bath heating composite apparatus of 1st Example, and the timer reservation heating start with the graph of target (or setting) room temperature. It is a system block diagram which shows typically the flow of the liquid at the time of the heating preheating operation | movement using the remaining hot water of the bathtub in the bath heating composite apparatus of 1st Example. It is a figure for demonstrating the example of the heating preheating operation control method of using the remaining hot water of the bathtub in the bath heating composite apparatus of 1st Example. It is a figure for demonstrating another example of the heating preheating operation control method of the remaining hot water of the bathtub in the bath heating complex apparatus of 1st Example. It is a flowchart which shows the heating preheating operation example of the use of the remaining hot water of the bathtub in 1st Example. It is a flowchart which shows another example of the heating preheating operation | movement of the hot water of the bathtub in 1st Example. It is a system block diagram which shows typically the flow of the liquid at the time of the heating preheating operation | movement using the remaining hot water of the bathtub in the bath heating complex apparatus of 2nd Example. It is a block diagram which shows the control structure of the bath heating composite apparatus of 2nd Example. It is explanatory drawing which shows the system structural example of a bath heating composite apparatus. It is a system block diagram which shows typically the flow of the liquid at the time of the reheating operation of the bathtub hot water in the bath heating composite apparatus shown in FIG. It is a system block diagram which shows typically the flow of the liquid at the time of the driving | operation of the low-temperature heating apparatus in the bath heating composite apparatus shown in FIG.

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

  FIG. 1 is a block diagram showing a control configuration of a first embodiment of the bath heating complex apparatus according to the present invention. As shown in FIG. 1, the control apparatus 1 provided in the present embodiment is , Bath hot water possessed heat quantity calculating means 5, preheating number determining means 6, preheating heat quantity calculating means 7, remaining hot water using heating preheating control means 8, and memory unit 9. In addition, the system configuration of the bath heating composite apparatus of the present embodiment is formed in the same manner as the schematic system configuration diagram shown in FIGS.

  The bathtub hot water retained heat amount calculation means 5 receives the heating preheating command for using the remaining hot water of the bathtub 27 and obtains the retained heat amount of the bathtub hot water based on the detected value of the thermistor 11 and the detected value of the water level sensor 26. The retained heat amount Hb [W · h] is obtained by, for example, the following equation (1), and the retained heat amount obtained by the bathtub hot water retained heat amount calculating means 5 is determined by the preheating frequency determining means 6 and the preheating heat amount. It is added to the calculation means 7.

  Hb [W · h] = 1 [kcal / L · K] × Wb [L] × (To−Ts) [K] × 1.163 [W · h / kcal] (1)

  Here, Wb is the amount of bathtub hot water determined from the detection value (the bathtub water level) of the water level sensor 26 and the relation data between the bathtub water level and the amount of bathtub water given in advance, and To is the detection value of the thermistor 11. This is the required bath water temperature. The detected temperature of the thermistor 11 becomes the hot water temperature T1 at the location where the thermistor 11 is provided in the return side passage 23 when the hot water in the follow-up circulation passage 25 is not circulated. When the bathtub hot water is circulated by circulating the hot water in the bath, the temperature To becomes the bath hot water temperature To. Ts is a reference temperature (lowest usable temperature), and the reference temperature is, for example, 20 [° C.]. Each unit W is watts, h is hours (hours), kcal is kilocalories, L is liters, and K is Kelvin.

  Note that the heating preheating command for using the remaining hot water in the bathtub 27 is issued, for example, when the operation unit for the preheating command provided in the remote control device 2 connected to the control device 1 of the bath heating complex device is operated. Alternatively, when a predetermined warming time such as 4 hours elapses after the hot water filling operation is started by the automatic hot water filling operation of the bath that is started by pressing the automatic hot water filling switch of the remote control device 2. You may be made to emit.

  The preheating frequency determination means 6 includes time information from the receipt of the heating preheating command to a heating operation start reservation time of the heating device, and information on the operation time of a fixed or temporal variable per predetermined time. Based on this, the number of preheating operations (for example, y) for preheating the heating device intermittently is determined. The information on the operation time is stored in the memory unit 9, and the information on the operation time can be information of a fixed cycle (cycle in which operation is started every hour), for example, about 1 hour. Here, when the information on the operation time is 1 hour, for example, if the time information from the reception of the heating preheating command to the heating operation start reservation time of the heating device is about 5 hours, the preheating frequency determination means 6 The number of preheating operations is determined to be 5 times. The determined value of the number of preheating operations is added to the preheating calorie calculating means 7.

  In addition, since the information of operation time may be information of a time variable, for example, a cycle between receiving a heating preheating command and 2 hours before the heating operation start reservation time of the heating device is set to 2 hours, To reduce the load at the start of the heating operation at the reserved heating operation start time of the heating device, such as 30 minutes between the heating operation start reserved time and the heating operation start reserved time of the heating device is set to 30 minutes Set as appropriate.

  The preheating heat quantity calculation means 7 includes the number of preheating operations (y) of the heating device obtained by the preheating number determination means 6 and the amount of heat (Hb [W · h]) of the bathtub hot water obtained by the bathtub hot water possession heat quantity detection means 5. Based on the above, the amount of heat for preheating that can preheat the heating device is determined by the amount of retained heat. Then, the preheating calorie calculating means 7 adds the value of the obtained preheating calorie per one time to the remaining hot water heating preheating control means 8.

  Here, for example, as shown in FIG. 2, assuming that the amount of heat for preheating is equal to each other, the value Qx is Hb [W · h] / y. 2 and FIG. 3 to be described later are graphs relating to preheating timing, the amount of heat for preheating at each timing, the load necessary for heating at the heating start time of the heating device, and the subsequent load. It is shown by an image diagram together with a graph of a set room temperature of heating and a base heating target temperature.

  As shown in FIG. 3, when the preheating heat amount per time is changed for each preheating operation, the total value of the preheating heat amount per time becomes Hb, and the equation (Equation 1) is obtained.

  Here, n is a positive integer. In addition, although the changing method which changes the calorie | heat amount for preheating per time is not specifically limited, In order to reduce the load at the time of the heating start at the heating operation start reservation time of a heating apparatus, it shows, for example in FIG. Thus, immediately after receiving the heating preheating command and setting the heating amount per heating at the heating operation start reservation time of the heating device to be larger than the heating amount per heating during the time in between Is preferred.

  The remaining hot water use heating preheating control means 8 operates the bathtub hot water circulation pump 21 and the liquid circulation pump 19 on the basis of the preheating heat amount obtained by the preheating calorie calculation means 7 to reheat the circulation passage 25. The hot water passing through the bath and the liquid passing through the liquid circulation passage 4 are heat-exchanged via the heat exchanging means 20, and the liquid passing through the liquid circulation passage 4 is heated by the amount of heat stored in the hot bath water. That is, as shown in FIG. 4, the bathtub hot water circulation pump 21 and the liquid circulation pump 19 are operated to recirculate the bathtub hot water circulating in the recirculation circulation passage 25 and the liquid circulating in the liquid circulation passage 4 through the heat exchange means 20. Thus, the liquid circulating in the liquid circulation passage 4 is heated by the heat of the bathtub hot water circulating in the recirculation circulation passage 25.

  The remaining hot water use heating preheating control means 8 controls the driving of the bathtub hot water circulation pump 21 by the following method, for example. First, based on the preheating operation start schedule, driving of the bathtub hot water circulation pump 21 and the liquid circulation pump 19 is started. The preheating operation start schedule includes the number of preheating operations determined by the preheating number determination means 6, time information from the reception of the heating preheating command to the heating operation start reservation time of the heating device, information of the operation time, To be determined.

  Moreover, the operation continuation time of the bathtub hot-water circulation pump 21 and the liquid circulation pump 19 is determined based on the temporal change of temperature as shown to FIG. 5 (a), (b), for example. FIG. 5A shows a graph of temporal changes in the bath water temperature To and the detected temperature T3 of the thermistor 18, and FIG. 5B shows the return side passage 23 side to the heat exchange means 20 side. A graph of the temporal change of the return hot water temperature T1 flowing to the forward hot water temperature T2 flowing from the heat exchange means 20 side to the forward passage 24 side is shown. Moreover, the operation time of the bathtub hot-water circulation pump 21 is shown by ON / OFF in FIG.5 (d).

  The remaining hot water use heating preheating control means 8 obtains a difference (T1−T2) between the return hot water temperature T1 and the forward hot water temperature T2 as shown in FIG. Based on the information on the bathtub hot water flow rate flowing by driving the pump 21, the exhaust heat recovery heat amount per use of the remaining hot water for heating the liquid passing through the liquid circulation passage 4 by the retained heat amount of the bathtub hot water is shown in FIG. As shown in FIG. In addition, for the information on the bathtub hot water flow rate, for example, relational data between the driving current of the bathtub hot water circulation pump 21 and the bathtub hot water flow rate is obtained in advance through experiments or the like, and this relational data and the bathtub hot water circulation pump 21 are actually driven. It is obtained based on the drive current when The remaining hot water use heating preheating control means 8 drives the bathtub hot water circulation pump 21 until the exhaust heat recovery heat amount (integrated value) reaches the preheating heat amount per one time.

  Further, the calculation of the exhaust heat recovery heat amount per use of the remaining hot water can be performed by another method. For example, FIG. 6A shows a graph of temporal changes in the bath water temperature and the temperature detected by the thermistor 18 (the temperature of hot water passing through the liquid circulation passage 4). The remaining hot water use heating preheating control means 8 has a decreasing temperature of the bath hot water temperature shown in FIG. 6A (ΔTxi: i is a positive integer increasing by 1 as 1, 2, 3,...), Based on the information on the amount of hot water in the bathtub determined based on the detection value detected by the water level sensor 26, the exhaust heat recovery per use of the remaining hot water that heats the liquid passing through the liquid circulation passage 4 by the amount of heat stored in the bathtub hot water. The amount of heat may be calculated. In this case, the exhaust heat recovery amount is obtained by the bath water temperature drop amount Δxi × the bath water amount Wb. Also in this case, the remaining hot water use heating preheating control means 8 drives the bathtub hot water circulation pump 21 until the obtained exhaust heat recovery heat amount (integrated value) reaches the preheating heat amount per time.

  In any case, the driving of the liquid circulation pump 19 may be completed at the same time as the driving of the bathtub hot water circulation pump 21 or after a predetermined time has elapsed after the driving of the bathtub hot water circulation pump 21 is completed. Also good.

  The present embodiment is configured as described above. Next, an example of the exhaust heat recovery heating operation according to the present embodiment will be described. For example, as shown in FIG. 7, when the control device 1 receives a heating preheating command in step S <b> 1, exhaust heat recovery heating (heating preheating operation using the heat of the remaining hot water in the bath) is turned on (that is, heating preheating operation). In step S2, the combustion operation of the reheating / heating heat exchanger 17 is stopped. At this time, the liquid circulation pump (heating pump) 19 is operated. Next, in step S3, it is determined whether or not the heating operation start reservation time (timer reservation time) of the heating device. If the timer reservation time, the exhaust heat recovery heating is turned off in step S18, and in step S19, Start normal heating operation. This operation is an operation of heating the liquid passing through the liquid circulation passage 4 by the reheating / heating heat exchanger 17 to heat the heating device.

  On the other hand, if it is determined in step S3 that it is not the timer reservation time, it is determined in step S4 whether or not the temperature of the liquid (heating medium) in the liquid circulation passage 4 is lower than the preheatable set temperature Tx that is predetermined for preheating. If it is determined and the time is lower, it is determined in step S5 whether or not it is a heating operation start reservation time (timer reservation time) of the heating device. If it is a timer reservation time, the process proceeds to step S18 and step S19 in order.

  In step S5, when it is determined that the timer reservation time is not reached, exhaust heat recovery heating is performed. That is, in step S 6, the bathtub hot water circulation pump (reheating pump) 21 is turned on, and in step S 7, the bathtub hot water retained heat amount calculation means 5 determines the bath water temperature To and the water level sensor 26 obtained from the detection value of the thermistor 11. Based on the detected value, the amount of heat retained in the bathtub hot water (Hb [W · h]) is obtained. In step S8, the preheating calorie calculating means 7 calculates the number of preheating operations of the heating device obtained by the preheating frequency determining means 6 and the amount of heat (Hb [W · W · h]), a preheating heat amount (Qxi [W]) per preheating that can preheat the heating device by the retained heat amount is obtained and set (exhaust heat heating output setting). The circulation pump (reheating pump) 21 is turned off.

  Next, in step S10, the bathtub hot water circulation pump (reheating pump) 21 is turned on again, the operation time is reset, and the exhaust heat recovery operation is started. In step S11, it is determined whether or not the exhaust heat recovery operation time is one cycle time ΔH. If the exhaust heat recovery operation time has not reached one cycle time ΔH, the thermistors 11 and 12 are checked in step S12. The detected temperature is measured, and in step S13, based on the detected temperature and the operation time of the bathtub hot water circulation pump 21, the remaining hot water using heating preheating control means 8 calculates (integrates) the exhaust heat recovery heat amount per time. When the exhaust heat recovery heat amount (integrated value) reaches the preheating heat amount per time in step S14, the reheating pump 21 is turned off in step S15, and the exhaust heat recovery is stopped.

  In step S16, it is determined again whether or not the exhaust heat recovery operation time is one cycle time ΔH. When the exhaust heat recovery operation time reaches one cycle time ΔH (for example, Ps in FIG. 5D). In step S17, it is determined whether or not the timer reservation time is reached, and the operations from step S10 to step S16 are repeated until the timer reservation time is reached. When the timer reservation time is reached, the process proceeds to step S18 and step S19 in order.

  FIG. 8 shows another example of the exhaust heat recovery / heating operation according to the present embodiment. In FIG. 8, steps having the same operations as those in FIG. 7 are denoted by the same step numbers. The operation shown in FIG. 8 is substantially the same as the operation shown in FIG. 7, but between step S10 and step S11, in step S101, the operation of measuring the bath water temperature To by the detection value of the thermistor 11 is performed. If the exhaust heat recovery operation time has not reached one cycle time ΔH in step S11, in step S102, the operation of measuring the bath water temperature To by the detected value of the thermistor 11 is performed every moment. In step S103, the remaining hot water using heating preheating control means 8 calculates (integrates) the exhaust heat recovery heat amount per time based on the product of the temperature difference ΔTxi of the thermistor 11 and the bathtub hot water amount Wb. That is, the operation shown in FIG. 8 is different from the operation shown in FIG. 7 in the calculation method of the exhaust heat recovery heat quantity by the remaining hot water using heating preheating control means 8.

  Next, a second embodiment of the combined bath heating apparatus according to the present invention will be described with reference to FIG. The second embodiment is configured in substantially the same manner as the first embodiment, and the second embodiment is different from the first embodiment in that the configuration of the liquid circulation passage 4 in the bath heating complex apparatus is the first embodiment. This is a different configuration.

  That is, in the second embodiment, the bypass passage 3 for circulating the liquid without passing through the reheating / heating heat exchanger 17 is provided, and the path for circulating the liquid through the bypass passage 3 to the liquid circulation passage 4. And a three-way valve 10 as a path switching means for switching between a path for circulating the liquid in the liquid circulation path 4 through the reheating / heating heat exchanger 17.

  Further, in the second embodiment, as shown in FIG. 10, a switching control means 13 for the three-way valve 10 is provided in the control device 1, and this switching control means 13 is provided for the remaining hot water using heating preheating control means 8. In conjunction with the operation, when the bathtub hot water circulation pump 21 is driven to heat the liquid in the liquid circulation passage 4 using the heat of the bathtub hot water, the liquid path in the liquid circulation passage 4 is changed to the bypass passage 3. When the liquid in the liquid circulation passage 4 is heated through the reheating / heating heat exchanger 17 by driving the burner 16 to the circulation route to the liquid circulation passage 4, the liquid passage in the liquid circulation passage 4 is replenished. A path that circulates in the liquid circulation passage 4 through the soaking / heating heat exchanger 17 is provided.

  In addition, this invention is not limited to the said Example, It sets suitably. For example, in the said Example, although the system structure which connected one hot water mat 15 was demonstrated as a low temperature heating apparatus, the several hot water mat 15 was connected or low temperature heating apparatuses other than the hot water mat 15 were connected. A system configuration may be formed. In this way, in the case of a system configuration in which a plurality of low-temperature heating devices are connected, when the preheating calorie calculating means 7 calculates the amount of preheating heat per time, it depends on the load such as the number and size of the low-temperature heating devices. It is preferable to change the amount of heat for preheating per one time.

  In addition, the system configuration of the combined bath heating apparatus of the present invention is not particularly limited, and is set as appropriate. For example, instead of the burners 16 and 46 that perform gas combustion provided in the above embodiment, oil combustion A burner may be provided, or an electric heater may be provided.

  The bath heating composite device of the present invention can efficiently heat the heating device using the heat of the remaining hot water in the bathtub, so that energy saving can be achieved, and for example, it can be used as a bath heating composite device for home use. .

DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Remote control apparatus 3 Bypass passage 4 Liquid circulation passage 5 Bath hot water possession heat quantity calculation means 6 Preheating frequency determination means 7 Preheating heat quantity calculation means 8 Remaining hot water use heating preheat control means 10 Three-way valve 11, 12, 18 Thermistor 17 Heating / heating heat exchanger 19 Liquid circulation pump 20 Heat exchange means 21 Bath hot water circulation pump 23 Return side passage 24 Outward passage 25 Reheating circulation passage 26 Water level sensor 27 Bathtub

Claims (4)

  A hot water circulation pump connected to the bathtub, the hot water circulation passage is provided with a hot water circulation pump for circulating hot water in the hot water, and the hot water temperature detecting means for detecting the temperature of the hot water in the bathtub, Water level detecting means for detecting the water level of the bathtub hot water, the recirculation circulation passage and the liquid circulation passage of the heating device are thermally connected via heat exchange means, and the liquid circulation passage is connected to the liquid circulation passage. A bath heating complex apparatus provided with a liquid circulation pump for circulating the liquid in the passage, wherein the detection value of the bathtub hot water temperature detection means and the detection of the water level detection means in response to a heating preheating command for use of remaining hot water in the bathtub The hot water holding heat amount calculating means for determining the hot water holding heat amount based on the value, and the time information from the reception of the heating preheating command until the heating operation start reservation time of the heating device is determined once in advance. Preheating operation number determining means for determining the number of preheating operations for intermittently preheating the heating device based on the information on the operation time of the constant or temporal variable, and the number of preheating operations of the heating device determined by the preheating frequency determination means And preheating heat quantity calculating means for obtaining a preheating heat quantity per preheating that allows the heating device to be preheated based on the retained heat quantity based on the stored hot water quantity obtained by the bathtub hot water holding heat quantity detection means, and the preheating heat quantity The bathtub hot water circulation pump and the liquid circulation pump are operated based on the amount of heat for preheating obtained by the calculation means, and the bathtub hot water passing through the recirculation circulation passage and the liquid passing through the liquid circulation passage are heated. And a remaining hot water using heating preheating control means for heating the liquid passing through the liquid circulation passage by the amount of heat stored in the bathtub hot water through an exchange means. To bath heating composite apparatus.   The recirculation circulation passage has a return side passage from the bathtub to the inlet of the heat exchange means and a forward passage from the exit side of the heat exchange means to the bathtub, The temperature difference between the return hot water temperature flowing from the return side passage side to the heat exchange means side and the forward hot water temperature flowing from the heat exchange means side to the forward side passage side, and the bathtub hot water flow rate flowing by driving the bathtub hot water circulation pump Based on the information, the exhaust heat recovery heat amount per use of the remaining hot water that heats the liquid passing through the liquid circulation passage is calculated based on the stored heat amount of the bath hot water, and the exhaust heat recovery heat amount is converted into the preheat heat amount per time. The bath heating combined apparatus according to claim 1, wherein the bath hot water circulation pump is driven until the temperature reaches.   The remaining hot water use heating preheating control means recovers exhaust heat per use of the remaining hot water that heats the liquid that passes through the liquid circulation passage by the retained heat amount of the bathtub hot water based on the temperature drop of the bathtub hot water temperature and the amount of hot water in the bathtub. The bath heating complex apparatus according to claim 1, wherein the bath heating / water circulation pump is driven until the amount of heat is calculated and the exhaust heat recovery heat amount reaches a preheating heat amount per one time.   A heating device for heating the liquid passing through the liquid circulation passage is connected to the liquid circulation passage to heat the heating device to a set temperature, and the heating circulation device is not passed through the liquid circulation passage. A path switching for providing a bypass passage for circulating the liquid and switching between a path for circulating the liquid through the bypass circulation path to the liquid circulation path and a path for circulating the liquid through the heating heating device to the liquid circulation path. The bath heating composite apparatus according to claim 1, wherein means is provided.

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