JP2004144327A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater with good usability which clearly displays the amount of remaining hot water in a hot water tank. <P>SOLUTION: The hot water storage type water heater provided with the hot water tank 7 for storing hot water, and a heating part 2 for boiling the hot water in the hot water tank 7, includes a remaining heat quantity detecting means 41 for detecting remaining heat quantity Q in the hot water tank 7, a remaining hot water amount calculating means 42 for converting the remaining heat quantity Q to the remaining hot water amount q at a predetermined conversion temperature Tc, a remaining hot water supply time calculating means 43 for converting the remaining hot water amount q to a remaining hot water supply time t at a predetermined conversion flow rate fc, and a display part 39 for displaying the remaining hot water supply time t. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hot water storage type hot water supply apparatus.
[0002]
[Prior art]
Conventionally, in this type of hot water storage type hot water supply apparatus, as disclosed in Patent Document 1, the remaining hot water amount in a hot water storage tank is detected by a plurality of temperature sensors provided on the side of the tank, and this is detected as a standard hot water temperature. In some cases, the remaining amount of hot water is displayed in terms of the number of liters in terms of the amount of hot water.
[0003]
[Patent Document 1]
JP-A-5-118572
[Problems to be solved by the invention]
However, in this conventional apparatus, since the remaining hot water amount is displayed only as how many liters, it is difficult for the user to know how much the hot water amount is, and it is not easy to use.
[0005]
For example, when the user uses a large amount of hot water, the user can not recognize that the remaining hot water is not enough and runs out of water during showering after filling the bathtub. There was a problem.
[0006]
[Means for Solving the Problems]
Therefore, in order to solve the above-mentioned problems, the present invention provides a hot water storage type hot water supply device including a hot water storage tank for storing hot water and a heating unit for boiling hot water in the hot water storage tank. Remaining heat amount detecting means for detecting the remaining heat amount, remaining hot water amount calculating means for converting the remaining heat amount to a remaining hot water amount at a predetermined converted temperature, and hot water supply remaining for converting the remaining hot water amount to a remaining hot water supply time at a predetermined converted flow rate A time calculating means and a display unit for displaying the remaining hot water supply time are provided.
[0007]
Thereby, it is possible to detect the amount of residual heat remaining in the hot water storage tank, convert the amount of residual heat as the amount of residual hot water at a predetermined conversion temperature, and display the amount of residual heat as the remaining time of hot water supply at a predetermined conversion flow rate. It is possible to easily display the remaining hot water amount as the remaining time according to actual use.
[0008]
According to a second aspect of the present invention, in a hot water storage type hot water supply device including a hot water storage tank for storing hot water and a heating unit for boiling the hot water in the hot water storage tank, a residual heat amount detection unit configured to detect a residual heat amount in the hot water storage tank. A remaining hot water amount calculating means for converting the remaining heat amount into a remaining hot water amount at a predetermined conversion temperature; It is provided with a means for calculating remaining hot water supply time and a display for displaying the remaining time of hot water supply.
[0009]
Thereby, the amount of residual heat remaining in the hot water storage tank is detected, the amount of residual heat is converted as the amount of residual hot water at a predetermined conversion temperature, and the amount obtained by subtracting the amount of hot water from the remaining hot water into the bathtub is converted to a predetermined value. It is possible to display as the remaining time of hot water supply at the flow rate, and it is possible to easily display the remaining hot water amount excluding the hot water used for hot water filling as the remaining time suitable for actual use.
[0010]
Further, in claim 3, the display unit indicates that the bathtub can be filled once with the remaining hot water supply time.
[0011]
Thereby, it is possible to clearly display that the remaining hot water supply time can be used after filling the hot water.
[0012]
Further, in claim 4, the hot water supply remaining time calculating means converts the remaining hot water amount not subtracting the hot water amount into the remaining hot water supply time at a predetermined conversion flow rate after once filling the bath tub. I made it.
[0013]
Thus, there is no problem that the amount of hot water is further subtracted from the amount of remaining hot water after the hot water is filled, and the remaining hot water supply time suitable for actual use can be displayed.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a hot water supply type hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank unit, 2 is a heating unit composed of a heat pump unit, 3 is a hot water tap, 4 is a remote controller, 5 is a bathtub, and 6 is a power supply.
[0015]
The hot water storage tank unit 1 includes a hot water storage tank 7 for storing hot water, a hot water supply pipe 8 connected to an upper part of the hot water storage tank 7, a water supply pipe 9 connected to a lower part of the hot water storage tank 7, Mixing valve 11 for mixing water and low-temperature water from bypass pipe 10 branched from water supply pipe 9, hot water supply pipe 12 connected downstream of mixing valve 11, and hot water supply temperature sensor 13 provided on hot water supply pipe 12 A hot water supply flow rate sensor 13 provided in the hot water supply pipe 11, a water supply temperature sensor 15 provided in the water supply pipe 8, a hot water supply pipe 16 branched from the hot water supply pipe 12 and connected to the bathtub 5, and a hot water supply pipe A hot water filling valve 17 for opening and closing the hot water 16, a hot water filling flow rate sensor 18 for integrating the flow rate flowing through the hot water filling pipe 16, and an overpressure relief valve for releasing the overpressure of the hot water storage tank 7 branched and connected from the hot water supply pipe 8. 19 and the water pipe 8 A pressure reducing valve 20 for reducing the supplied water supply pressure, a plurality of hot water storage temperature sensors 21 provided in the vertical direction on the side surface of the hot water storage tank 7, and a hot water supply control unit mainly comprising a microcomputer for controlling the hot water storage tank unit 1. 22 and a heating circulation circuit 23 that connects the hot water storage tank 7 and the heating unit 2 to circulate hot water.
[0016]
The heating unit 2 includes a compressor 24 for compressing a carbon dioxide refrigerant, a refrigerant-water heat exchanger 25 as a condenser, a decompressor 26, and a heat pump circuit 28 including an air heat exchanger 27 as an evaporator. A blower 29 for blowing air to the air heat exchanger 27, a circulating pump 30 of variable capacity provided in the middle of the heating circulation circuit 23, and a coolant-water provided on the inlet side of the refrigerant-water heat exchanger 25 of the heating circulation circuit 23. A heat exchange inlet temperature sensor 31 for detecting the temperature of the hot and cold water flowing into the heat exchanger 25, and hot and cold water provided at the outlet of the refrigerant-water heat exchanger 25 of the heating circulation circuit 23 and flowing out of the refrigerant-water heat exchanger 25 And a heating control unit 33 mainly configured by a microcomputer for controlling the heating unit 2.
[0017]
Here, the power source 6 is a time zone light, and the power rate is set at a low price during the night (from 23:00 to 7:00 the following day). It is used to heat the amount of hot water stored on the day and use it during the daytime (from 7:00 to 23:00), and additional power is supplied when the remaining hot water becomes low. Boiling is performed. The power supply 6 is connected to a hot water supply control unit 22, and a communication signal is superimposed on the remote controller 4 and the heating control unit 33 (including electric power required for the heat pump circuit 27) by wire from the hot water supply control unit 22 so that the electric power is supplied. What is supplied.
[0018]
Then, in the night time zone, the hot water supply control unit 22 calculates the required amount of hot water storage on the next day, and instructs the heating control unit 33 to boil the target hot water storage amount by the end of the night time period, and instructs the heat pump The circuit 27 is operated to start driving the circulation pump 30 of the heating circulation circuit 23. Then, the hot and cold water taken out from the lower part of the hot water storage tank 7 by the drive of the circulation pump 30 flows into the refrigerant-water heat exchanger 25 of the heating unit 2 and is heated and returned to the upper part of the hot water storage tank 7 via the heating circulation circuit 23. As a result, high-temperature hot water is stored.
[0019]
Then, when the hot water storage temperature sensor 21 provided on the side surface of the hot water storage tank 7 detects that a predetermined amount of high-temperature water has been stored, or when the heat exchange inlet temperature sensor 31 detects a predetermined temperature or more, the hot water supply control is performed. The unit 22 instructs the heating control unit 33 to stop the heating operation, the operations of the heat pump circuit 28 and the circulation pump 30 are stopped, and the hot water storage operation is completed by the end of the night time zone.
[0020]
Here, the amount of heat stored in the hot water storage tank 7 is calculated by the hot water supply control unit 22 using the amount of heat considered appropriate from the hot water supply load for the past several days as the target hot water storage amount, and the temperature of the hot water stored. Varies in the range of 60 ° C. to 90 ° C. depending on the season (or the supply water temperature detected by the supply water temperature sensor 15) and the magnitude of the target hot water storage amount.
[0021]
The remote controller 4 has a temperature setting switch 34 for setting a hot water supply set temperature, a hot water switch 35 for instructing hot water to the bathtub 5, a hot water level setting switch 36 for setting the hot water level, and a remaining time for hot water supply. , A display unit 39 formed of a dot matrix type fluorescent display tube, and controls the operation unit 38 and the display unit 39, as well as the hot water supply control unit 22. A remote control control unit 40 mainly comprising a microcomputer for performing communication is provided. During normal operation, the hot water supply set temperature and time information set on the display unit 39 by the operation unit 38 and the hot water storage temperature sensor 21 are used for detection. The remaining hot water storage amount and the like are displayed. The display section 39 may be a dot matrix type liquid crystal display section.
[0022]
Next, when the hot-water tap 3 is opened, the high-temperature water in the upper part of the hot-water storage tank 7 is pushed out to the hot-water tap 8 by the feed pressure from the hot-water supply pipe 9, and the mixing valve 11 controlled by the hot-water control unit 22 controls the bypass pipe 10. The low-temperature water and the temperature detected by the hot water supply temperature sensor 13 are mixed so as to become the hot water supply set temperature set by the operation unit 37 of the remote controller 4, and the hot water is supplied through the hot water supply pipe 12.
[0023]
If the hot water supply amount becomes larger than usual, the hot water supply control unit 22 detects that the remaining hot water storage amount detected by the hot water storage temperature sensor 21 has decreased during the daytime power hours, and the hot water has been stored in the hot water storage tank 7. If the hot water is expected to run out, the necessary amount of heat is increased using daytime electric power at that time.
[0024]
Next, when filling the bathtub 5 with hot water, when the hot water switch 35 of the remote controller 4 is operated, the hot water supply control unit 22 opens the hot water valve 17 to start hot water filling and starts hot water filling. When it is detected that the accumulated flow rate after that has reached the filling level, the filling valve 17 is closed to complete filling.
[0025]
Next, the characteristic configuration of the present invention will be described based on the block diagram shown in FIG.
41 is a residual heat amount calculating means for calculating the residual heat amount Q in the hot water storage tank 7, 42 is a residual hot water amount calculating means for converting the residual heat amount to a residual hot water amount q at a predetermined conversion temperature Tc, 43 is a predetermined conversion of the residual hot water amount q. The remaining hot water supply time calculating means converts the remaining hot water supply time t at the flow rate fc, and these are stored as programs as one function of the hot water supply control unit 22.
[0026]
The remaining heat amount calculation means 41 receives the temperatures detected by the plurality of hot water storage temperature sensors 21 and the feed water temperature sensor 15 and displays the remaining hot water supply time t by operating the remaining time display switch 37 of the remote controller 4. The amount of residual heat Q remaining in the hot water storage tank 7 is calculated from the temperatures T1 to T5 detected by the plurality of hot water storage temperature sensors 21 and the water supply temperature Tw in response to the request. The method of calculating the residual heat amount Q is such that the capacity of the hot water storage tank 7 is divided into the same number of areas A1 to A5 as the plurality of hot water storage temperature sensors 21, and the temperatures T1 to T5 detected by the hot water storage temperature sensors 21 provided in each area. The remaining heat amount Q remaining in the hot water storage tank 7 is calculated by integrating the values A1 to A5 corresponding to the value obtained by subtracting the supply water temperature from the values A and A, and summing these values. Expressing this as an equation,
Q = A1 · (T1-Tw) + A2 · (T2-Tw) + ‥‥
It becomes.
[0027]
The residual hot water amount calculating means 41 calculates the residual heat amount Q calculated by the residual heat amount calculating means 40, the feed water temperature Tw from the feed water temperature sensor 15, and the predetermined conversion temperature Tc (for example, 43 ° C.) stored in advance. The remaining heat amount Q is calculated by dividing the remaining heat amount Q by a value obtained by subtracting the feedwater temperature Tw from the predetermined conversion temperature Tc. Expressing this as an equation,
q = Q / (Tc-Tw)
It becomes.
[0028]
Next, the remaining hot water supply time calculating means 42 calculates the remaining hot water amount q calculated by the remaining hot water amount calculating means 41 and a predetermined conversion flow rate fc (volume flow rate, for example, which is larger than the flow rate at the time of a standard shower). 12 L / min) and the filling amount qset set by the filling amount setting switch 36 of the remote controller 4 are input, and the filling amount qset to the filling amount qset until the filling of the bathtub 5 is performed. Is divided by a predetermined converted flow rate fc to calculate a remaining time t capable of supplying hot water except for filling, and after the filling is performed, the remaining hot water amount q itself is divided by the predetermined converted flow rate fc. The remaining hot water supply time t is calculated, and the data of the remaining hot water supply time t, the data of the remaining hot water amount q, and the data as to whether or not the filling operation has been performed are output to the display unit 38. When this is represented by an equation, t = (q-qset) / fc: before filling the bath t = q / fc: after filling the bath
[0029]
Here, whether or not the bathtub 5 has been filled with hot water is determined by whether the hot water supply control means 22 stores that the hot water switch 35 has been pressed and whether or not this has been pressed during the day. The memory is reset at a predetermined point in time, such as the start or end of a late-night time zone, so that it is determined whether or not hot water is filled.
[0030]
Then, the display unit 38 displays the remaining hot water amount q, the fact that hot water can be filled in the bathtub 5 (here, for example, a bathtub figure is displayed and one time next to it), and the remaining hot water supply time t. (Here, for example, a shower figure and the remaining time are displayed in minutes next to the shower figure) are displayed. When data indicating that the filling operation has been performed is output from the remaining hot water supply time calculating means 42, only the remaining hot water amount q and the remaining hot water supply time t are displayed as shown in FIG. The fact that hot water can be filled in the bathtub 5 (here, for example, a bathtub figure and displayed once next to it) is turned off so as not to be displayed.
[0031]
As described above, the remaining hot water amount q in the hot water storage tank 7 is displayed as the remaining hot water supply time t at the predetermined converted flow rate fc. It is easy to determine whether or not the remaining hot water remains, and a practical form of displaying the remaining hot water amount q in accordance with actual use is provided, thereby improving usability. In addition, before the hot water is filled in the bathtub, the remaining hot water supply time t excluding the hot water amount qset in the bathtub 5 is displayed, so that the amount of hot water remains sufficiently in consideration of the expected usage time of the shower by the user. It is possible to judge whether the remaining hot water quantity q is sufficient and there is no problem that the hot water runs out during the shower at the time of bathing. After the hot water is filled in the bathtub, the remaining hot water amount q is converted into the remaining hot water supply time t and displayed. There is no such a problem that the subtracted hot water supply remaining time t is displayed, and a practical display of the remaining hot water supply time t suitable for actual use is possible.
[0032]
Further, since the predetermined reduced flow rate fc used in calculating the remaining hot water supply time t is set to a flow rate that is stronger than the flow rate during a standard shower, the hot water supply runs out earlier than the displayed remaining hot water supply time t. That can be prevented.
[0033]
In addition, since the remaining hot water supply time t and the remaining hot water amount q are displayed at the same time, the remaining hot water amount q can also be known at the same time, which may hinder the convenience of the user who grasps the expected hot water usage as the hot water amount (liter). Nothing is more convenient.
[0034]
The present invention is not limited to this embodiment. For example, a display request for the remaining hot water supply time may be issued by operating the operation unit 38 of the remote controller 4 in a predetermined procedure. The predetermined converted temperature Tc may be, for example, the hot water supply set temperature set by the temperature setting switch 34 of the remote controller 4, and the filling amount to be divided by the remaining hot water supply time calculating means 42 may be stored in advance, for example. It is a good thing as a standard fixed amount of hot water.
[0035]
Further, the heating unit 2 is not limited to the heat pump unit, but may be one in which an electric heater is provided in the hot water storage tank 7.
[0036]
【The invention's effect】
As described above, according to the first aspect of the present invention, the residual heat amount remaining in the hot water storage tank is detected, the residual heat amount is converted as the residual hot water amount at a predetermined conversion temperature, and the residual hot water amount is determined by a predetermined amount. The remaining hot water can be displayed as the remaining time of the hot water supply at the converted flow rate, and the remaining hot water can be displayed in an easy-to-understand manner as the remaining time suitable for actual use. Is less likely to be mistaken, and usability is improved.
[0037]
According to the second aspect, the amount of residual heat remaining in the hot water storage tank is detected, and the amount of residual heat is converted as the amount of residual hot water at a predetermined conversion temperature. Can be displayed as the remaining hot water supply time at a predetermined converted flow rate, and the remaining hot water amount excluding the hot water used for hot water filling can be displayed as the remaining time according to actual use in a way that is easy for the user to understand. The amount of remaining hot water after filling the bath tub in an easy form can be notified, and the amount of remaining hot water is less likely to be erroneously recognized, and usability is improved.
[0038]
Further, according to the third aspect, it is possible to easily display the remaining hot water supply time that can be used after filling the hot water.
[0039]
Further, according to the fourth aspect, there is no problem that the amount of hot water is further subtracted from the amount of remaining hot water after the hot water is filled, and the remaining hot water supply time suitable for actual use can be displayed.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hot water storage type hot water supply apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram of the same embodiment.
FIG. 3 is an explanatory view showing a display unit after filling with hot water in the same embodiment.
[Explanation of symbols]
2 Heating part 5 Bathtub 7 Hot water storage tank 39 Display part 41 Residual heat amount calculating means 42 Remaining hot water amount calculating means 43 Remaining hot water supply time calculating means Q Remaining heat amount Tc Converted temperature q Remaining hot water amount qs Hot water filling amount fc Converted flow time Remaining hot water supply time

Claims (4)

In a hot water storage type hot water supply device including a hot water storage tank for storing hot water and a heating unit for boiling the hot water in the hot water storage tank, a residual heat amount detection unit that detects a residual heat amount in the hot water storage tank, and a residual heat amount that is a predetermined amount. A remaining hot water amount calculating means for converting the remaining hot water amount at the converted temperature, a remaining hot water supply time calculating means for converting the remaining hot water amount to a remaining hot water supply time at a predetermined converted flow rate, and a display unit for displaying the remaining hot water supply time are provided. A hot-water storage type hot water supply device characterized by the above-mentioned. In a hot water storage type hot water supply device including a hot water storage tank for storing hot water and a heating unit for boiling the hot water in the hot water storage tank, a residual heat amount detection unit that detects a residual heat amount in the hot water storage tank, and a residual heat amount that is a predetermined amount. Remaining hot water amount calculating means for converting the remaining hot water amount at the converted temperature, and remaining hot water remaining time calculating means for converting the remaining hot water amount obtained by subtracting the amount of hot water filling the bathtub from the remaining hot water amount into a remaining hot water supply time at a predetermined converted flow rate. And a display unit for displaying the remaining hot water supply time. The hot water supply type hot water supply device according to claim 2, wherein the display unit displays that the hot water can be filled in the bathtub once together with the remaining hot water supply time. The hot water supply remaining time calculating means, after once filling the bath tub, converts the remaining hot water amount without subtracting the hot water amount into a remaining hot water supply time at a predetermined conversion flow rate. The hot water storage type hot water supply device according to claim 2.

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