JP3714299B2 - Hot water system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply system that performs hot water supply using a water heater having an automatic hot water filling function for a bathtub, particularly when the hot water heater fills a bathtub in an automatic hot water filling mode before the completion of boiling. The present invention relates to a hot water supply system that performs boiling warning.
[0002]
[Prior art]
As a hot water supply system using an auxiliary heat source, for example, a solar water heater having a heat storage tank for storing preheated hot water generated using solar heat as an auxiliary heat source, and an automatic hot water filling function to a bathtub are provided. Conventionally, a hot water supply system combined with a hot water heater is known.
[0003]
In such a hot water supply system, the solar water heater's heat storage tank and the water heater's heat exchanger are connected to each other, and stored in the solar water heater's heat storage tank during hot water supply or automatic hot water filling in the bathtub. Preheated hot water is sent to the heat exchanger of the water heater, but the preheated hot water stored in the heat storage tank is not only sent to the heat exchanger, but if necessary, the preheated hot water is cooled to the preheated hot water sent from the heat storage tank. The water heater is connected to the upstream side of the heat exchanger from the heat storage tank so that it can be sent to the heat exchanger in a state where water (normal tap water or water having a temperature lower than the preheated hot water) is mixed. A mixing control valve for mixing the preheated hot water and the low-temperature water to be fed at an arbitrary mixing ratio is mounted.
[0004]
Therefore, when filling hot water to the bathtub in the automatic hot water filling mode, if preheated hot water above the bath set temperature set for the water heater is stored in the heat storage tank, the mixing control valve of the water heater will The hot water of the bath set temperature is generated by appropriately mixing preheated hot water that is higher than the bath set temperature sent from the heat storage tank and low temperature water, and automatic injection into the bathtub without burning the burner that heats the heat exchanger. When hot water is to be used and preheated hot water at or above the bath set temperature is not stored in the heat storage tank, the mixing control valve of the water heater is preheated hot water and low temperature water below the bath set temperature sent from the heat storage tank. Is mixed as appropriate, while hot water at a predetermined fixed temperature lower than the bath set temperature is sent to the heat exchanger, and the hot water at the bath set temperature is burned by burning a burner that heats the heat exchanger. Form, will be the automatic pouring it to the bathtub.
[0005]
In addition, the hot water filling to the bathtub in the automatic hot water filling mode may be performed in a state where there is an initial storage such as remaining hot water in the bathtub, so normally, when pouring to the bathtub is completed, When the hot water temperature is lower than the bath set temperature, the reheating is automatically performed up to the bath set temperature.
[0006]
In addition, when performing hot water filling to the bathtub in the automatic hot water filling mode, it is usually notified when the hot water filling to the bathtub is completed, but when the hot water filling to the bathtub is completed. In order to be able to take a bath immediately, a boiling advance notice for prompting preparation for bathing is performed before a predetermined time (for example, 3 minutes) before the completion of hot water filling.
[0007]
As described above, in the automatic hot water filling mode, hot water at the bath set temperature is automatically poured for the amount of hot water, regardless of whether or not the preheated hot water above the bath set temperature is stored in the heat storage tank. In the case of making a boiling notice, calculate the recharge time required to recharge the initial stored amount of remaining hot water, etc. to the bath set temperature in advance, and at the pouring stage, the remaining time of pouring every predetermined time Is calculated as the sum of the remedy time and the remaining pouring time, and the required boiling time is within a predetermined time (for example, 3 minutes). When it becomes, it will come to the boiling notice. In addition, when boiling cannot be announced at the pouring stage, that is, when the initial storage amount is large, the remedy time for the initial storage portion becomes long and the remedy time exceeds the predetermined time. In the memorial stage, when the hot water temperature in the bathtub rises to a predetermined temperature (for example, bath set temperature -1 ° C.) set in advance with respect to the bath set temperature, a boiling warning is made. Yes.
[0008]
[Problems to be solved by the invention]
By the way, in the hot water supply system as described above, even when the temperature of the preheated hot water stored in the heat storage tank is slightly lower than the bath set temperature, the water heater reliably generates hot water having the bath set temperature. So that the preheated hot water sent from the heat storage tank is appropriately mixed with low temperature water to a fixed temperature lower than the bath set temperature, and then heated with a heat exchanger to reduce the temperature drop. This increases the fuel consumption of the burner required to heat the heat exchanger, and when hot water is filled in the bathtub in the automatic hot water filling mode, the preheated hot water generated by the auxiliary heat source is used. There is a problem that the effective use of can not be achieved.
[0009]
To solve this problem, when hot water is filled in the bathtub in the automatic hot water filling mode, if the preheated hot water stored in the heat storage tank is not extremely low compared to the bath set temperature, it is sent out from the heat storage tank. It may be possible to change to a hot water filling operation in which preheated hot water lower than the bath set temperature is automatically poured into the bathtub as it is and then reheated after the pouring is completed to raise the bath temperature to the bath set temperature.
[0010]
However, when the hot water filling operation in the automatic hot water filling mode is changed to the operation as described above, the preheat stored in the heat storage tank even if the initial amount of remaining hot water stored in the bathtub is the same amount. If the temperature of hot water (pouring temperature) is lower than the bath set temperature, the memorization time after the pouring is completed becomes longer. As described above, the initial storage amount is assumed on the assumption that the pouring temperature is the bath set temperature. When the boiling warning is calculated according to the required boiling time in the pouring stage calculated based on the chasing time and the remaining pouring time, the boiling time is calculated from the time when the boiling warning is performed. There is a case in which the time interval until the actual completion of boiling is longer than a predetermined time, and there is a problem that it is impossible to always make a boiling notice at an appropriate timing.
[0011]
Accordingly, an object of the present invention is to provide a hot water supply capable of making a boiling notice at an appropriate timing even when the pouring temperature is lower than the bath setting temperature when filling the bathtub in the automatic hot water filling mode. To provide a system.
[0012]
[Means for solving the problems and effects thereof]
In order to solve the above-described problems, the invention according to claim 1 is a hot water supply system that performs hot water supply using a water heater having an automatic hot water filling function for a bathtub, and the hot water heater is in an automatic hot water filling mode. When hot water filling is performed, a boiling warning is given at either the pouring stage or the memorial stage after pouring is completed. The remaining pouring time at each point in time and the replenishment time required after the completion of pouring at each point in time, taking into account the amount of reheating for the already poured water up to each point, are calculated, respectively, When the total time of the remaining time and the memorial time falls within a predetermined time, a boiling advance notice will be given The reheating time required after the completion of pouring at each time point is calculated in advance by calculating the amount of reheating heat for the already poured hot water up to each time point, By adding the amount of remedy heat for the initial storage before pouring, the total amount of remedy heat at that time is calculated and calculated based on the total amount of remedy heat and the remedy output. The amount of additional heat for the already poured hot water up to the time is calculated based on the pouring temperature, the bath set temperature and the pouring flow rate at each time, while calculating the amount of additional heat for the hot water poured at each time. It is calculated by sequentially integrating the amount of heat. The hot water supply system characterized by this is provided.
[0013]
As described above, in this hot water supply system, when calculating the remaining pouring time at the pouring stage to the bathtub, the additional heat required after completion of pouring is considered in consideration of the amount of reheating heat for the already poured hot water up to that point. Since the dredging time is calculated, even if the pouring temperature is lower than the bath setting temperature, an appropriate memorial time can be calculated, and whether the pouring temperature is the bath setting temperature or not. Regardless of this, it is always possible to make a boiling notice at an appropriate timing.
[0015]
In particular, This In the hot water supply system of this type, at the time of pouring into the bathtub, the amount of additional heat for the pouring amount at each time point is calculated based on the pouring temperature, the bath set temperature and the pouring flow rate at each point in time. However, by adding up the amount of additional heat in order, the amount of additional heat for the already poured hot water until each time point is calculated. Because it is Even when the pouring temperature and the pouring flow rate fluctuate in the pouring stage, it is possible to calculate an appropriate amount of reheating heat that takes those fluctuations into account, and to make a boiling advance notice with high accuracy.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 shows a schematic configuration of a hot water supply system 1 using preheated hot water generated by solar heat as an auxiliary heat source. In this hot water supply system 1, as shown in the figure, a solar water heater 10 and a hot water heater 20 are connected, and preheated hot water generated by the solar water heater 10 is sent to the water heater 20. It is like that.
[0019]
The solar-heated water heater 10 includes a solar heat collector 11 and a sealed heat storage tank 14, and a water supply pipe 15 for supplying low-temperature water to the lower end of the heat storage tank 14 is connected to the heat storage tank 14. At the same time, a preheated hot water supply pipe 16 for sending the stored preheated hot water to the water heater 20 is connected to the upper end.
[0020]
In the solar collector 11, a heat medium circulation path is formed by a solar pipe 12 that connects the inlet side and the outlet side of the solar collector 11, and the solar pipe 12 is partially introduced into the heat storage tank 14. The heat exchanger 13 is provided. Therefore, the heat medium heated by the solar heat collector 11 is guided into the heat storage tank 14 through the solar pipe 12, and heat exchange with the water in the heat storage tank 14 is performed by the heat exchanging unit 13, thereby the heat storage tank. The preheated hot water is generated in 14.
[0021]
The hot water heater 20 has an automatic hot water filling function for a bathtub, and when hot water filling to the bathtub is started in the automatic hot water filling mode, the water heater 20 is automatically used until a predetermined water level or a predetermined amount of hot water is stored in the bathtub. When pouring is performed and the pouring is completed, if the hot water temperature in the bathtub is lower than the bath set temperature tbe, the hot water in the bath is automatically replenished until it reaches the bath set temperature tbe. To be done.
[0022]
The water heater 20 includes a mixing control valve 21 that mixes low temperature water supplied via the water supply pipe 17 and preheated hot water supplied from the heat storage tank 14 via the preheated hot water supply pipe 16 as necessary. The main flow path 23 having the heat exchanger 22 connected to the outlet side of the mixing control valve 21 and heating the hot water delivered from the mixing control valve 21 as necessary is bypassed. And a bypass channel 24 connected to the main channel 23. The bypass channel 24 has a relatively low temperature delivered from the mixing control valve 21 to the hot water delivered from the heat exchanger 22. A bypass valve 25 for generating hot water having a hot water supply set temperature tse or a bath set temperature tbe by appropriately mixing the hot water is installed.
[0023]
Further, a bypass pipe 26 that bypasses the mixing control valve 21 is connected to the main flow path 23 connected to the hot water outlet side of the water supply pipe 17 and the mixing control valve 21, and the bypass pipe 26 is energized. A diaphragm type electromagnetic valve 26a for blocking the flow path of the bypass pipe 26 is installed.
[0024]
Further, the preheated hot water supply pipe 16 connected to the mixing control valve 21, the upstream side of the connection part of the bypass pipe 26 in the main flow path 23, and the downstream side connection part of the heat exchanger 22 and the bypass flow path 24. A preheated hot water temperature sensor 27 for detecting the temperature (preheated hot water temperature) tp sent from the heat storage tank 14 and a temperature (mixed hot water temperature) tm sent from the mixing control valve 21 are detected. The heat exchanger temperature sensor 29 for detecting the mixed hot water temperature sensor 28 and the outlet hot water temperature of the heat exchanger 22 as the temperature (heat exchanger temperature) tc of the heat exchanger 22 itself is installed.
[0025]
Further, the water heater 20 is equipped with a controller 20a capable of communicating with the controller 30a of the operation remote controller 30 via a serial interface, and these controllers 20a and 30a cooperate with each other to supply hot water. The operation of the vessel 20 is comprehensively controlled.
[0026]
The controller 20a receives temperature detection signals from the preheating hot water temperature sensor 27, the mixed hot water temperature sensor 28, and the heat exchanger temperature sensor 29, as well as a hot water supply set temperature tse and a bath set temperature set by the operation remote controller 30. The tbe, the operation switch signal, and the like are transmitted from the controller 30a of the operation remote controller 30, and the controller 20a controls the mixing control valve 21 based on these temperature detection signals and the hot water supply set temperature tse or the bath set temperature tbe. The burner (not shown) for heating the bypass valve 25 and the heat exchanger 22 is controlled.
[0027]
First, when hot water is supplied or when hot water is filled in the bathtub in the automatic hot water filling mode, the temperature of the preheated hot water sent from the heat storage tank 14, that is, the preheated hot water temperature detected by the preheated hot water temperature sensor 27 is used. When tp is equal to or higher than the hot water supply set temperature tse or the bath set temperature tbe, hot water having the hot water set temperature tse or the bath set temperature tbe is supplied by appropriately mixing low temperature water without burning the burner of the water heater 20. Therefore, the temperature of the hot water delivered from the mixing control valve 21, that is, the mixed hot water temperature tm detected by the mixed hot water temperature sensor 28 is set to the hot water supply set temperature tse or the bath set temperature tbe that is the target temperature. The target temperature control for adjusting the opening degree of the mixing control valve 21 is performed. Therefore, when hot water is filled in the bathtub in the automatic hot water filling mode, the hot water of the bath set temperature tbe is automatically poured into the bathtub without burning the burner of the water heater 20.
[0028]
On the other hand, when preheating hot water temperature tp is lower than hot water supply set temperature tse when hot water is supplied or when hot water is filled in a bathtub in automatic hot water filling mode, as shown below, The mixing control valve 21 performs different control depending on whether the hot water supply is performed or when the hot water is filled in the bathtub in the automatic hot water filling mode.
[0029]
First, when hot water is supplied, if the preheating hot water temperature tp is lower than the hot water supply set temperature tse, the hot water at the hot water supply set temperature tse cannot be supplied unless the burner of the water heater 20 is burned. The hot water at the fixed temperature tsf (hot water supply set temperature tse−10 ° C.) that is the target temperature is converted into the heat exchanger 22 so that hot water at the hot water supply set temperature tse can be reliably generated by burning the burner of the heater 20. The target temperature control for adjusting the opening of the mixing control valve 21 and mixing the low temperature water is performed.
[0030]
On the other hand, when the hot water filling to the bathtub is performed in the automatic hot water filling mode, if the preheated hot water temperature tp is lower than the bath set temperature tbe, as shown below, the preheated hot water temperature tp is set to the bath set temperature tbe. Depending on whether or not the temperature is equal to or higher than a reference temperature tps (for example, bath set temperature tbe-6 ° C.) set between the fixed temperature tbf (bath set temperature tbe−10 ° C.), a different hot water pouring operation is executed. Become.
[0031]
First, when the preheating hot water temperature tp is equal to or higher than the reference temperature tps, the mixing control valve 21 uses the preheating hot water below the bath set temperature tbe as it is in order to make maximum use of the preheating hot water stored in the heat storage tank 14. In this state, the preheated hot water lower than the bath set temperature tbe is automatically poured into the bathtub without burning the burner of the water heater 20 to the heat exchanger 22.
[0032]
On the other hand, when the preheating hot water temperature tp is lower than the reference temperature tps, the mixing control valve 21 performs target temperature control for generating hot water having a fixed temperature tbf by mixing the preheating hot water and the low temperature water. The hot water having the set temperature tbe is generated by burning the burner of the water heater 20 while sending the generated hot water having the fixed temperature tbf to the heat exchanger 22 of the water heater 20. You will be pouring water.
[0033]
Therefore, when the preheated hot water temperature tp is lower than the reference temperature tps, only the initial storage such as the remaining hot water stored in the bathtub before starting the automatic pouring to the bathtub is set to the bath set temperature after the automatic pouring is completed. However, when the preheated hot water temperature tp is equal to or higher than the reference temperature tps, both the initial storage amount and the pouring portion are replenished to the bath set temperature tbe after the automatic pouring is completed. .
[0034]
Moreover, in this hot water supply system 1, when performing hot water filling to the bathtub in the automatic hot water filling mode, when the hot water filling to the bathtub is completed, the fact is notified via the operation remote controller 30. In addition, a boiling advance notice for urging preparation for bathing is performed at a predetermined timing before completion of hot water filling so that bathing can be performed immediately upon completion of hot water filling. Hereinafter, the hot water filling operation to the bathtub in the automatic hot water filling mode will be described with reference to the flowcharts shown in FIGS.
[0035]
First, as shown in FIG. 2, it is determined whether or not the hot water filling to the bathtub is started in the automatic hot water filling mode (step S1), and the hot water filling to the bathtub is not started in the automatic hot water filling mode. Wait until the hot water filling in the bathtub starts in automatic hot water filling mode. On the other hand, in step S1, when hot water filling to the bathtub is started in the automatic hot water filling mode, 10 l of hot water is forcibly pre-poured into the bathtub in order to release air from the pipe (step S2). , It is determined whether the hot water in the bathtub is equal to or higher than the water level that can be circulated (water level that can be remedied) (step S3), and if the hot water in the bathtub is below the water level that can be circulated, the process returns to step S2. Again, 10 l of warm water is pre-poured into the bathtub. Therefore, even when there is remaining hot water or the like above the circulatable water level in the bathtub when hot water filling is started, 10 l of preliminary pouring is always performed.
[0036]
In step S3, when the hot water in the bathtub reaches a circulating water level or higher, an initial storage amount Vi of hot water stored in the bathtub is calculated at that time (step S4). The water heater 20 has a fully automatic type that automatically adds hot water when the hot water in the bathtub falls below the set water level while detecting the level of hot water in the bathtub by the water level sensor, and a water level sensor. However, there are some semi-automatic types that cannot add hot water, but the full-automatic water heater 20 is detected by the bottom area of the bathtub stored during the trial operation of the water heater 20 and the water level sensor at that time. On the basis of the water level, the initial storage amount Vi is calculated, and the semi-automatic water heater 20 forcibly replenishes for a predetermined time at that time, and the amount of heat for renewal at that time (remaining output × remaining time) ) And the temperature difference between the hot and cold water stored in the bathtub and before and after the chasing, the initial storage amount Vi is calculated.
[0037]
When the initial storage amount Vi of the hot water in the bathtub is calculated in this manner, the hot water of the initial storage amount Vi is bathed based on the initial storage amount Vi, the bath set temperature tbe, and the temperature tb of the hot water in the bathtub. A reheating heat amount G0 necessary for reheating up to the set temperature tbe is calculated (step S5), and a reheating heat amount G1 required for reheating the hot water poured thereafter to the bath setting temperature tbe is set to 0. After the initial setting (step S6), pouring into the bathtub is started (step S7).
[0038]
In step S7, after the start of pouring into the bathtub, until the pouring is completed, a predetermined pouring stage process is executed at a cycle of 1 second (step S8). Hereinafter, the pouring stage process will be described with reference to the flowchart shown in FIG.
[0039]
First, the remaining pouring time Tz after pouring for the current one second is calculated based on the remaining pouring amount and the pouring flow rate after pouring this time (step S21). The remaining amount of pouring after the current pouring can be calculated by subtracting the amount of pouring this time (1 second) from the remaining amount of pouring after the previous pouring. As the remaining amount of pouring, the initial required pouring amount before the start of pouring, which is obtained when the initial storage amount Vi of hot water in the bathtub is calculated, is used.
[0040]
Subsequently, the sum (G0 + G1) of the required additional heat amount G0 for the initial storage amount and the required additional heat amount G1 for the previously poured hot water is required for the hot water heater 20 to reheat for 2.5 minutes. 1. The chasing time required for chasing the hot water in the bathtub after the previous pouring to the bath set temperature tbe, whether or not the chasing heat amount (2.5 minutes x chasing output F) or less. It is determined whether or not it is within 5 minutes (step S22). When G0 + G1> 2.5 minutes × remaining output F, that is, the hot water in the bathtub after the previous pouring is reheated to the bath set temperature tbe. If the remedy time required for this has already exceeded 2.5 minutes, the pouring has already been completed 2.5 minutes before the completion of the hot water filling. Immediately, determine whether or not the pouring has been completed. Step S29) If the pouring is not completed, the process returns to step S21 and the same process is repeated until the pouring is completed.
[0041]
On the other hand, in step S22, if G0 + G1 ≦ 2.5 minutes × memorial output F, the time point of 2.5 minutes before the completion of filling of the hot water to the bathtub may still be the pouring stage, and the pouring stage Therefore, the amount of reheating heat required to reheat the hot water poured in this second to the bath setting temperature tbe is determined as the pouring temperature tx at that time, It is calculated based on the bath set temperature tbe and the pouring flow rate L at that time (step S23), and the calculated reheating heat amount g for the current pouring amount is set as the reheating heat amount G1 for the existing pouring portion until the previous time. By adding, the reheating heat amount G1 for the already poured hot water up to this time is calculated (step S24). In addition, in the first time, since the reheating heat amount G1 = 0 with respect to the already poured hot water up to the previous time, the reheating heat amount G1 = g with respect to the already poured hot water up to this time is obtained.
[0042]
And the amount of reheating heat for the already poured hot water thus far calculated in this way, the required amount of reheating heat G0 for the initial storage previously calculated, and the reheating output F of the water heater 20 Based on the above, the total chasing time Tf required to chase the hot water in the bathtub after the current pouring (initial stored amount + the already poured hot water amount) to the bath set temperature tbe is calculated (step S25).
[0043]
Subsequently, it is determined whether or not the boiling warning has already been performed (step S26). If the boiling warning has already been performed, it is not necessary to perform the boiling warning again. It is determined whether or not the pouring is completed (step S29). If the pouring is not completed, the process returns to step S21 and the same process is repeated until the pouring is completed.
[0044]
On the other hand, in step S26, when the boiling-up notice has not been performed yet, the sum of the previously calculated remaining pouring time Tz after the current pouring and the total remedy time Tf after the present pouring is 2.5. Within a minute, it is determined whether or not the remaining amount Qz of pouring after the current pouring is within 20% of the initial required pouring amount Qi (step S27). Since it is not time to perform the boiling advance notice, it is immediately determined whether or not the pouring is completed without performing the boiling advance notice (step S29). If the pouring is not completed, the process goes to step S21. Returning to the above, the same processing is repeated. However, if the previous condition is satisfied in step S27, whether or not the pouring is completed after the boiling notice is given at that time (step S28). (Step S29) If not Ryo returns to step S21, thus repeating the same process.
[0045]
In step S29, when pouring into the bathtub is completed, as shown in FIG. 2, after starting reheating (step S9), it is determined whether or not a boiling warning has already been made (step S10). If the boiling warning is performed, it is not necessary to perform the boiling warning again. Therefore, it is immediately determined whether or not the chasing is completed (step S13). If the chasing is not completed, Returning to step S10, the same processing is repeated until the replenishment is completed.
[0046]
On the other hand, in step S10, when boiling-up notice is not yet performed, it is determined whether or not the hot water temperature tb in the bathtub after pouring is not lower than the bath set temperature tbe-1 ° C. (step S11). If the hot water temperature tb in the bathtub is lower than the bath set temperature tbe-1 ° C., it is not yet time to perform the boiling warning. (No in step S13) If the reheating is not completed, the process returns to step S10 and the same process is repeated until the reheating is completed. In step S11, the hot water temperature in the bathtub is determined. When tb is equal to or higher than the bath set temperature tbe-1 ° C., at the time, after the boiling warning is made (step S12), it is determined whether or not the reheating is completed (step S13).焚If There has not been completed, the process returns to step S10, thus repeating the same process until the reheating is completed.
[0047]
In step S13, when the reheating is completed, at that time, the fact that the hot water filling to the bathtub is completed is notified (step S14), and the hot water filling operation to the bathtub in the automatic hot water filling mode is finished.
[0048]
As described above, in the hot water supply system 1, in the pouring stage to the bathtub, the hot water calculation time Tz at each time point and the reheating heat amount G1 with respect to the already poured hot water up to each time point are taken into consideration at a cycle of 1 second. Since the total chasing time Tf required after the pouring is completed at each time point is calculated, and the timing of the boiling notice in the pouring stage is determined based on the pouring time Tz + the total chasing time Tf. Even when the hot water temperature is lower than the bath set temperature tbe, it is possible to accurately calculate the time required from the time point to the completion of the hot water filling, and whether the hot water temperature is the bath set temperature tbe or not. Regardless, it is always possible to make a boiling notice at an appropriate timing.
[0049]
Further, in the hot water supply system 1, in the pouring stage to the bathtub, with respect to the pouring amount at each time point based on the pouring temperature tx, the pouring flow rate L, and the bath setting temperature tbe at each time point in a cycle of 1 second. While calculating the reheating heat amount g, the reheating heat amount g is sequentially integrated to calculate the reheating heat amount G1 for the already poured hot water up to each time point. Even when the pouring temperature tx or the pouring flow rate L varies, an appropriate reheating heat amount G1 taking these variations into account is calculated, and the boiling advance notice can be performed with high accuracy.
[0050]
In the above-described embodiment, the timing of the boiling advance notice in the pouring stage is such that the sum of the remaining pouring time Tz and the total remedy time Tf is within 2.5 minutes, and the pouring remaining amount Qz is initial. Set the time when the required amount of pouring Qi is within 20% of the required pouring amount, and set the timing of boiling notification in the memorial stage when the hot water temperature tb in the bathtub reaches the bath set temperature tbe-1 ° C or higher. However, the present invention is not limited to this, and the timing of the boiling advance notice in the pouring stage and the chasing stage may be appropriately set according to the chasing output of the water heater, the pouring flow rate, and the like.
[0051]
Further, in the above-described embodiment, in the pouring stage, the reheating heat amount G1 for the already poured water up to each time point is calculated while calculating the reheating heat amount g for the pouring amount at each time point in a cycle of 1 second. In addition, based on the calculated amount of additional heat G1, the total additional time Tf for the already poured hot water and the initial stored amount up to each time point is calculated. However, the present invention is not limited to this. In accordance with the temperature difference between the pouring temperature tx and the bath set temperature tbe at each time point, the replenishment time for the pouring amount at each time point is roughly set, while the already poured hot water amount and the initial time It is also possible to roughly calculate the total remedy time for the stored amount. Hereinafter, when this method is adopted, a pouring stage process executed at a cycle of 1 second from the start of pouring to the completion of pouring will be described with reference to the flowchart shown in FIG.
[0052]
In the previous stage of shifting to the pouring stage process, that is, in the stage before the start of pouring, as in the above-described embodiment, preliminary pouring is performed until the hot water in the bathtub becomes equal to or higher than the circulating water level. The initial storage amount Vi of the hot water stored in the tank is calculated, but the reheating heat amount G0 for the initial storage amount is calculated in advance, and the reheating heat amount G1 for the subsequent pouring portion is initially set to 0. Unlike the above-described embodiment, in this case, the chasing time Ta for the initial storage amount is calculated in advance, and the chasing time Tb for the subsequent pouring portion is initially set to 0.
[0053]
First, as shown in the figure, whether or not the temperature difference (tbe-tx) between the current pouring temperature tx and the bath set temperature tbe is equal to or higher than a predetermined temperature Δte (for example, 3 ° C.). (Step S31), and if tbe-tx is equal to or greater than Δte, it is assumed that it is necessary to carry out replenishment for a predetermined specified time Tbe with respect to the current pouring amount. By adding the specified time Tbe to the chasing time Tb for the pouring water, the chasing time Tb for the already poured water after the current pouring is roughly calculated (step S32). By adding to the replenishment time Ta for the initial storage amount calculated in the above, the hot water in the bathtub after the current pouring (initial storage amount + already poured water amount) is replenished to the bath set temperature tbe. Calculate the total memorial time Tf required ( Step S33). In the first time, since the chasing time Tb = 0 for the previously poured hot water up to the previous time, the chasing time Tb = Tbe for the pouring hot water up to this time.
[0054]
On the other hand, if tbe-tx is less than Δte in step S31, it is assumed that there is no need to reheat the current pouring amount, and the reheating time Tb for the pouring portion up to the previous time is set. By adding the remedy time Tb to the previously calculated initial storage amount Ta without adding the specified time Tbe, the hot water in the bathtub after the current pouring (initial storage amount + existing storage time) The total chasing time Tf required to chase the hot water) to the bath set temperature tbe is calculated (step S33).
[0055]
Subsequently, it is determined whether or not a boiling warning has already been made (step S34). If a boiling warning has already been made, there is no need to make a boiling warning again. It is determined whether or not the pouring is completed (step S38), and if the pouring is not completed, the process returns to step S31 and the same process is repeated until the pouring is completed.
[0056]
In step S34, when the boiling notice has not been made yet, it is determined whether or not the remaining amount Qz of pouring after the current pouring is within 20% of the initial required pouring amount Qi (step S35). If the remaining pouring amount Qz after pouring exceeds 20% of the initial required pouring amount Qi, it is not yet time to make a boiling notice, so the pouring will be performed immediately without making a boiling notice. It is determined whether or not it has been completed (step S38), and when pouring is not completed, the process returns to step S31 and the same processing is repeated.
[0057]
In step S35, when the remaining amount Qz of pouring after the current pouring is within 20% of the initial required pouring amount Qi, it is determined whether or not the total remedy time Tf calculated earlier is equal to or longer than the specified time Tfe. (Step S36), if the total remedy time Tf is equal to or longer than the specified time Tfe, the pouring has already been completed at the point of 2.5 minutes before the completion of the hot water filling, Since the advance notice cannot be performed, it is immediately determined whether or not the pouring is completed (step S38). If the pouring is not completed, the process returns to step S31 until the pouring is completed. Similar processing is repeated.
[0058]
In step S36, if the total remedy time Tf calculated earlier is less than the specified time Tfe, after raising boiling notice at that time (step S37), it is determined whether or not the pouring is completed. (Step S38) If the pouring has not been completed, the process returns to step S31 and the same process is repeated.
[0059]
In addition, after pouring is completed, the process similar to step S9-S14 in embodiment mentioned above will be performed.
[0060]
As described above, in this pouring stage process, the temperature difference (tbe-tx) between the pouring temperature tx and the bath set temperature tbe at each time point is memorized with respect to the pouring amount at each time point in a cycle of 1 second. While converting into time, the converted chasing time is sequentially integrated to calculate the chasing time Tb for the already poured portion at each time point, so that the pouring temperature tx is the bath setting temperature tbe. If it is less than, it is possible to roughly calculate the total remedy time Tf considering the pouring temperature tx. Therefore, without considering the pouring temperature at all, as the pouring temperature is calculated and the boiling time is predicted on the assumption that the pouring temperature is the bath set temperature, the boiling temperature decreases. The boiling notice is not greatly deviated, and the boiling notice can be performed at a substantially appropriate timing.
[0061]
Moreover, in each embodiment mentioned above, although the pouring stage process is performed with a 1 second period, it is not limited to this, What is necessary is just to set suitably according to the processing capability of the controller 20a.
[0062]
Moreover, in each embodiment mentioned above, although the hot water supply system at the time of using a general full auto type and semiautomatic type water heater was demonstrated, in a full auto type water heater, as one of the automatic hot water filling modes, , There is something that has a function called speed auto, which starts pouring immediately without pre-pouring, and when automatic hot water filling is performed in such speed auto mode, When there is remaining hot water or the like below the circulatorable water level, the initial storage amount Vi cannot be calculated. In such a case, the reheating heat amount G0 or the renewal time Ta with respect to the initial storage amount is ignored, and pouring is performed. The total remedy time Tf may be calculated based only on the remedy heat amount G1 for the minute or the remedy time Tb.
[0063]
Moreover, in each embodiment mentioned above, although fixed temperature tsf is set to hot water supply preset temperature tse-10 degreeC and fixed temperature tbf is set to bath preset temperature tbe-10 degreeC, it is not limited to this, For example, When the hot water supply set temperature tse is 60 ° C. or more, less than 60 ° C., 35 ° C. or more, and less than 35 ° C., the case of 60 ° C. or more is 45 ° C., the case of less than 60 ° C. is 35 ° C. or more, 30 ° C. or less than 35 ° C. Can be fixedly set according to the hot water supply set temperature tse and the bath set temperature tbe, such as 25 ° C.
[0064]
In the above-described embodiment, the hot water supply system using the water heater 20 in which the mixing control valve 21 is incorporated has been described. However, the present invention is not limited to this, and via the hot water connection unit having the mixing control valve, The present invention can also be applied to a hot water supply system in which a solar water heater and a normal water heater are connected.
[0065]
In the above-described embodiment, the hot water supply system in which the auxiliary heat source is solar heat has been described. However, the auxiliary heat source is not limited to such solar heat. For example, a gas engine, a gas turbine, or a fuel cell in a cogeneration system is used. It goes without saying that the present invention can be applied to a hot water supply system using various auxiliary heat sources, such as a hot water supply system using the exhaust heat of the above as an auxiliary heat source.
[0066]
In the above-described embodiment, the hot water supply system that performs hot water supply using the preheated hot water generated by the auxiliary heat source has been described. For example, as shown in FIG. In a hot water supply system in which the bathroom heater / dryer 42 is connected via 43 and 44, the three-way valve 43 is switched to the bathroom heater / dryer 42 side in order to raise the room temperature of the bathroom R before bathing. In the state where the three-way valve 44 is switched to the bathtub B side, when performing hot water filling while operating the bathroom heater / dryer 42, as shown by the arrow in the figure, the warm water sent from the water heater 41 is Since the water is radiated by the heat exchanger of the bathroom heater / dryer 42 and then poured into the bathtub B, the hot water that is actually poured into the bathtub even if the water heater 41 sends out hot water at the bath set temperature. The temperature is lower than the bath set temperature It will be. Therefore, by applying the present invention to such a hot water supply system, the same effect as that of the hot water supply system 1 described above can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a hot water supply system according to the present invention.
FIG. 2 is a flowchart showing a hot water filling operation to a bathtub in an automatic hot water filling mode in the hot water supply system same as above.
FIG. 3 is a flowchart showing a pouring stage process in a hot water filling operation to a bathtub in the automatic hot water filling mode.
FIG. 4 is a flowchart showing a pouring stage process in a hot water supply system according to another embodiment.
FIG. 5 is a schematic configuration diagram showing another hot water supply system to which the present invention can be applied.
[Explanation of symbols]
1 Hot water supply system
10 Solar water heater
14 Thermal storage tank
15, 17 Water supply pipe
16 Preheated hot water supply pipe
20 Water heater
20a controller
21 Mixing control valve
22 Heat exchanger
23 Main channel
24 Bypass channel
25 Bypass valve
26 Bypass pipe
26a solenoid valve
27 Preheated hot water temperature sensor
28 Mixed hot water temperature sensor
29 Heat exchanger temperature sensor
30 Operation remote control
30a controller
41 Water heater
42 Bathroom heating dryer

Claims (1)

A hot water supply system for supplying hot water using a water heater having an automatic hot water filling function to a bathtub,
When the water heater fills the bathtub in the automatic hot water filling mode, the boiling warning is given at either the pouring stage or the memorial stage after the pouring is completed.
At the pouring stage to the bathtub, for each predetermined time, the remaining pouring time at each time point and the replenishment time required after completion of pouring at each time point, taking into account the amount of reheating heat for the already poured water up to each time point, , And when the total time of pouring remaining time and memorial time calculated every predetermined time is within a predetermined time set in advance ,
The reheating time required after the completion of pouring at each time point is calculated as the amount of reheating heat for the already poured water up to each time point, and the amount of reheating heat for the already poured water amount and the pre-calculated initial time before pouring. By adding the amount of remedy heat for the stored amount, the total amount of remedy heat at that time is calculated, and based on the total amount of remedy heat and the remedy output,
The reheating heat amount for the already poured hot water up to each time point is calculated based on the pouring temperature, the bath set temperature and the pouring flow rate at each time point while calculating the reheating heat amount for the hot water pouring time at each time point. A hot water supply system that is configured to calculate the amount of scoring heat by sequentially integrating the amounts .

Images