JP4048740B2 - Hot water storage water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to boiling control of a hot water storage type hot water heater in a fee system according to seasons.
[0002]
[Prior art]
In recent years, for the purpose of leveling power consumption, each electric power company has selectively adopted a charge system according to time zone even for ordinary households. Compared to the conventional power contract system that can only use midnight power, this system has the merit of improving usability because it can be used during daytime hours, but from 23:00 in the midnight hours to 7:00 in the next morning Instead of significantly lowering electricity bills, other daytime bills are expensive.
[0003]
Hereinafter, a hot water storage type water heater corresponding to a conventional power contract system according to time zone will be described with reference to FIG.
[0004]
In FIG. 6, 1 is a hot water storage tank, 2 is a hot water outlet provided in the upper part of the hot water storage tank 1, 3 is a water supply port provided in the lower part of the hot water storage tank 1, 4 is a circulation pump, and 5 is used to heat hot water in the tank 1. Boiling means, 6 is a heat source section composed of the circulation pump 4 and the boiling means 5, 7 is a lower temperature detecting means provided at the lower part of the hot water storage tank 1, 8 is a clock that measures the current time, and 9 is time. A band determination unit, 10 is a midnight time zone control unit, 11 is a daytime time zone control unit, 12 is a temperature determination unit, 13 is a heat source drive unit, and 14 is a heat source control unit.
[0005]
The hot water storage type water heater configured as described above is such that hot water is discharged from the hot water outlet 2 each time the user uses hot water, and the same amount of water is supplied from the hot water outlet 3. And if there is a certain temperature difference between hot water and water, by forming a mixed layer at the boundary part, the hot water in the hot water storage tank 1 keeps the hot water and the lower part keeps the water state, and the hot water temperature without mixing with each other Can be supplied at a stable hot water temperature. The boiling control of this hot water storage type water heater is performed according to the following procedure.
[0006]
First, the time zone determination unit 9 determines the current time zone from the time of the clock 8. If the time zone is a midnight time zone, the midnight time zone control unit 10 is selected, and if the time zone is a daytime time zone, the daytime time zone control unit 11 is selected. That is, in the conventional charge system by time zone, the time zone determination unit 9 determines whether it is a midnight time zone or a daytime time zone, and is detected by the lower temperature detection means 7 when this daytime time zone control unit 11 is selected. When the temperature determining unit 12 determines that the temperature is equal to or lower than the predetermined temperature, the heat source driving unit 13 controls the heat source unit 6 to start boiling. The boiling control is performed by the circulation pump 4 pumping up the water in the lower part of the hot water storage tank 1 to the upper part, and the pumped water is heated by the boiling means 5.
[0007]
[Problems to be solved by the invention]
However, in recent years, each electric power company has adopted a seasonal charge system for each time period that further divides the conventional daytime time period and has a difference in electric charge for each time period. In this seasonal charge system, if the heating control of the conventional hot water storage water heater is used, the temperature detected by the lower temperature detection means can be used for temperature judgment even during the daytime period by season. When it is determined that the temperature is equal to or lower than the predetermined temperature in the unit, the heat source driving unit controls the heat source unit and starts boiling. Here, the power contracts by season and time zone refer to the following contents. In the midnight hours, electricity prices are set lower than those in the daytime hours and there is a price gap, but even in the daytime hours, the time zones are further divided to provide a difference in electricity rates. In the daytime hours, the electricity charges during periods when hot water is frequently used are reduced, and conversely, the hours when hot water is not used are increased. This time zone when hot water is not used is called a daytime zone, and is set, for example, from 10:00 to 17:00. Therefore, when the heating is started unconditionally during the daytime by the conventional heating control, there is a problem that an expensive electric charge unintended by the user must be paid.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides a time zone determination unit for determining each time zone in the seasonal time zone rate system, and this time zone determination unit is a cheap time zone in the daytime time zone. If the lower temperature detecting means detects that the inside of the hot water storage tank is below a predetermined temperature during the period being determined, the heating control by the heat source unit is performed, and the period during which it is determined that it is other daytime period is Even without a heating control, and further provided with an upper temperature detecting means arranged at the upper part outside the hot water storage tank, the hot water storage hot water can be stored even during the period when the time zone determination unit determines that it is the daytime zone according to the seasonal time zone. When the upper temperature detecting means detects that the temperature in the tank is lower than a predetermined temperature, the heating control by the heat source unit is performed .
[0009]
According to the above invention, since the heating control can be selected and performed during the inexpensive time zone in the seasonal time zone fee system determined by the time zone determination unit, the lower temperature is increased during the expensive daytime time zone. Even if the detection means detects below the predetermined temperature that is the boiling start condition, it does not start boiling unconditionally, and it solves the problem of paying an expensive electricity charge unintended by the user , and by season Even in the daytime period of the hourly rate system, when the upper temperature detecting means detects that the remaining hot water in the hot water storage tank is low, boiling control can be started to prevent hot water from running out .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The invention described in claim 1 includes a hot water storage tank, a heat source part for boiling hot water in the hot water storage tank, a lower temperature detecting means arranged at the lower part of the hot water storage tank, and a time in a seasonal time zone rate system. A time zone determination unit that determines the time zone, and the period during which the time zone determination unit determines that the time zone is a morning time zone / evening time zone for each season time zone, the inside of the hot water storage tank is below a predetermined temperature If the lower temperature detecting means detects this, the lower temperature detecting means performs the heating control by the heat source unit and determines that the inside of the hot water storage tank is not more than the predetermined temperature during the period when it is determined that it is the daytime zone. Even if it is detected, heating control by the heat source part is not performed , and further, an upper temperature detection means arranged at the upper part outside the hot water storage tank is provided, and the time zone determination unit is a daytime zone according to seasonal time zone Even during the judging period, If detecting that the click is a predetermined temperature or less is the upper temperature sensing means, and to perform control boiling by the heat source unit.
[0011]
And even if the lower temperature detection means detects below the predetermined temperature that is the boiling start condition during the daytime hours of the seasonal fee system, it does not start boiling unconditionally. If the upper temperature detection means detects that the remaining hot water in the hot water storage tank is low even during the daytime hours of the seasonal hourly rate system, The raising control can be started to prevent the hot water from running out.
[0012]
According to the second aspect of the present invention, when the upper temperature detecting means detects the predetermined temperature lower than the predetermined temperature and starts the boiling control by the heat source unit, the upper temperature detecting means detects the predetermined temperature higher than the predetermined temperature. The boiling control is stopped at.
[0013]
Then, when the upper temperature detection means detects that the remaining hot water in the hot water storage tank is low and starts the boiling control, the boiling temperature is raised when a predetermined temperature higher than the predetermined temperature of the boiling start condition is detected. Since the control is stopped, it is possible to secure an amount of hot water that prevents hot water from running out, and to prevent an increase in the electricity bill without performing heating control more than necessary during the daytime.
[0014]
The invention described in claim 3 is such that when the upper temperature detecting means detects a temperature lower than a predetermined temperature and starts the heating control by the heat source section, the heating control is stopped when a predetermined time elapses. is there.
[0015]
And when the upper temperature detection means detects that the remaining hot water in the hot water storage tank is low, the boiling time is limited and the boiling control is performed, so the minimum boiling operation is ensured. It is possible to secure a sufficient amount of hot water to prevent running out of hot water, and it is possible to prevent an increase in electricity bill without performing heating control more than necessary during daytime.
[0016]
According to a fourth aspect of the present invention, there is provided an intermediate temperature detecting means disposed below the upper temperature detecting means, and when the upper temperature detecting means detects a predetermined temperature or less and starts the heating control by the heat source part. The boiling-up control is stopped when the middle temperature detecting means detects a predetermined temperature or higher.
[0017]
And since the boiling detection control is started and stopped using the temperature detecting means arranged at a position where a predetermined remaining hot water amount can be ensured, the amount of hot water that can surely prevent hot water shortage can be secured, and Effective boiling control can be performed in the daytime.
[0018]
Further, the invention described in claim 5 includes a required hot water amount calculation unit for calculating the required amount of hot water today from past usage conditions, and the required hot water amount can be obtained by boiling control after the end of daytime in the required hot water amount calculation unit. If it is determined that it is not possible, the lower temperature detection means detects that the hot water storage tank is below a predetermined temperature even during the period when the time zone determination unit determines that it is the daytime zone by season. In this case, the boiling control by the heat source unit is performed.
[0019]
And since boiling-up control for securing the required amount of hot water can be automatically started even during daytime, hot water can be automatically prevented and a comfortable hot water supply life can be realized. .
[0020]
Further, the invention described in claim 6 includes a heat source control requesting means for requesting control to the heat source part, and when the user makes a request from the heat source control requesting means, the time zone determination part is classified according to the season. Even when it is determined that it is a daytime period by time zone, if the lower temperature detection means detects that the hot water storage tank is at a predetermined temperature or lower, the boiling control by the heat source is performed. is there.
[0021]
And also in a daytime zone, a user can start boiling control by one's own intention. Therefore, it is possible to secure an unforeseen amount of hot water that cannot be predicted when the required amount of hot water today is automatically determined from past usage conditions, and can consciously prevent running out of hot water. Life can be realized.
[0022]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0023]
Example 1
FIG. 1 is a configuration diagram of a hot water storage type water heater in Embodiment 1 of the present invention.
[0024]
20 is a hot water storage tank, 21 is a hot water outlet provided in the upper part of the hot water storage tank 20, 22 is a water supply port provided in the lower part of the hot water storage tank 20, 23 is a circulation pump, 24 is a boiling means for heating the hot water in the tank 20, Reference numeral 25 denotes a heat source section composed of the circulation pump 23 and the boiling means 24, 26 denotes an upper temperature detecting means disposed above the hot water storage tank 20, and 27 denotes a middle temperature detecting means disposed below the upper temperature detecting means 26. , 28 is a lower temperature detecting means disposed at the lower part of the hot water storage tank 20, 29 is a clock that keeps the current time, 30 is a time zone determination unit, 31 is a midnight time zone control unit, and 32 is a morning time zone control unit. , 33 is a daytime zone control unit, 34 is an evening time zone control unit, 35 is a temperature determination unit, 36 is a heat source driving unit, 37 is a clock 29, a time zone determination unit 30, a midnight time zone control system 31, and a morning time zone. Control method 32 and daytime control method 33 a heat source control unit and a night time zone control scheme 34 and temperature determination unit 35 and the heat source driving unit 36, 38 is a power system selecting unit.
[0025]
This hot water storage type hot water heater is one in which hot water is discharged from the hot water outlet 21 every time the user uses hot water, and the same amount of water is supplied from the hot water supply port 22. Low temperature water is stored in a stratified state. In the boiling operation, low-temperature water at the bottom is pumped by the circulation pump 23 and heated by the boiling means 24 to be stored from the upper part of the hot water storage tank 20.
[0026]
Next, boiling control will be described. First, the time zone determination unit 30 determines the current time zone from the time of the clock 29. At this time, for example, as shown in FIG. 2, as the time zone classification of the seasonal time zone fee system, the late night time zone is from 23:00 to the next morning at 7am, and the morning time zone is from 7am to 10am in the daytime time zone. , Daytime is from 10:00 to 17:00, nighttime is from 17:00 to 23:00, the midnight time zone is the cheapest, the morning and evening hours are the next cheapest, and the daytime zone is more expensive And
[0027]
If the time of the clock 29 is midnight, the midnight time zone control unit 31 is selected, if it is the morning time zone, the morning time zone control unit 32 is selected, and if it is the daytime zone, the daytime zone control unit 33 is selected. If it is selected and it is an evening time zone, the evening time zone control unit 34 is selected.
[0028]
In the electric power system selection part 38, it can select and set whether it is a power contract according to a time slot | zone according to a season, or a power contract according to a time slot | zone. In the case of hourly power contracts, the electricity charges during the daytime hours are higher than the midnight electricity charges because they are more expensive, but a fixed charge is set. On the other hand, in the case of seasonal time zone power contracts, even in the daytime time zone, the time zone is further divided to provide a difference in electricity charges. In the daytime hours, the electricity charges during periods when hot water is frequently used are reduced, and conversely, the hours when hot water is not used are increased. This time when hot water is not used is called daytime.
[0029]
At this time, the time zone is the daytime zone, and the morning time zone control unit 32, the daytime zone control unit 33, or the evening time zone control unit 34 is selected, and the power system selection unit 38 sets the power contract by time zone. Is selected, when the temperature determining unit 34 determines that the temperature detected by the lower temperature detecting means 28 is equal to or lower than the predetermined temperature, the heat source driving unit 36 controls the heat source unit 25 to boil. Raising starts.
[0030]
On the other hand, when a power contract by season is selected by the power system selection unit 38, the morning time zone control unit 32 or the evening time zone control unit 34 is selected in the daytime time zone. For example, when it is determined by the temperature determination unit 34 that the temperature detected by the lower temperature detection means 28 is equal to or lower than the predetermined temperature, the heat source drive unit 36 controls the heat source unit 25 and starts boiling. . If the time zone is a daytime zone and the daytime zone control unit 33 is selected, even if it is determined by the temperature determination unit 35 that the temperature detected by the lower temperature detection means 28 is equal to or lower than a predetermined temperature. The heat source drive unit 36 does not control the heat source unit 25, and boiling is not started.
[0031]
In addition, even when a power contract by season is selected by the power system selection unit 38 and the time zone is a daytime zone and the daytime zone control unit 33 is selected, to prevent running out of hot water Perform the following control. When the hot water is continuously discharged by the user, when the temperature determination unit 35 determines that the remaining hot water in the hot water storage tank 20 has decreased due to the upper temperature detection means 26 detecting a predetermined temperature or lower, the heat source drive unit When 36 controls the heat source unit 25, boiling is started. The boiling control is performed by the circulation pump 23 pumping the water in the lower part of the hot water storage tank 1 to the upper part, and the pumped water is heated by the boiling means 24.
[0032]
The upper temperature detection means 26 detects that the remaining hot water in the hot water storage tank 20 is low, and the boiling start is set as a first stop condition for stopping the boiling control when the boiling control is started. The boiling-up control is stopped when a predetermined temperature higher than the predetermined temperature is detected.
[0033]
In addition, as a second stop condition, the boiling control may be stopped when a predetermined time has elapsed.
[0034]
In addition, as a third stop condition, the boiling control may be stopped when the middle temperature detecting means 27 detects a predetermined temperature or higher.
[0035]
Moreover, in FIG. 3, 39 is a required hot water calculating part.
[0036]
The required hot water amount calculation unit 39 has a function of calculating today's required hot water amount from the past usage of hot water amount. Therefore, the following control is performed even when the power contract by season is selected by the power system selection unit 38 and the daytime zone control unit 33 is selected in the daytime zone. .
[0037]
Normally, even if the temperature detected by the lower temperature detecting means 28 is determined by the temperature determining unit 35 to be equal to or lower than a predetermined temperature, the heat source driving unit 36 does not control the heat source unit 25, and the boiling control is performed. Will never start. However, if the amount of hot water in the hot water storage tank 20 is compared with the required amount of hot water today, and it is determined that the required amount of hot water cannot be secured even if the boiling control is started at night, the boiling control is performed. Start and prevent running out of hot water.
[0038]
Moreover, in FIG. 4, 40 is a heat source part control request | requirement means.
[0039]
The heat source control request means 40 has a function of forcibly starting the boiling control by the user's operation regardless of the selection status of the power system contract and the time zone at that time. Therefore, the following control is performed even when the power scheme selection unit 38 selects the seasonal power contract according to the time zone, and the time zone is the daytime time zone and the daytime zone control unit 33 is selected. . Normally, even if the temperature detected by the lower temperature detection means 28 is determined by the temperature determination unit 35 to be equal to or lower than a predetermined temperature, the heat source drive unit 36 does not control the heat source unit 25 and the boiling control is performed. Will never start. However, when the user requests boiling control from the heat source control request means 40, the boiling control is started to prevent hot water from running out.
[0040]
(Example 2)
FIG. 5 is a configuration diagram of a hot water storage type water heater according to a second embodiment of the present invention.
[0041]
The difference from the first embodiment is that the boiling means 24 is provided in the pumping path 23a of the circulating pump 23 that pumps the hot water stored in the lower part of the hot water tank 20, and the heating means is implemented using a heater or a heat pump. can do. The operation / action is the same as that of the first embodiment, and the description is omitted.
[0042]
【The invention's effect】
As described above, the hot water storage type water heater of the present invention selects the heating control in the cheap time zone in the seasonal time zone rate system determined by the time zone determination unit in the seasonal time zone rate system. Therefore, even if the lower temperature detection means detects the temperature below the predetermined temperature, which is the boiling start condition, during the expensive daytime period, the user does not start boiling unconditionally. The problem of not paying expensive electricity charges can be solved.
[0043]
In addition, when there is a risk of running out of hot water, boiling control is performed to ensure the minimum amount of hot water, so there is no worry about running out of hot water and the burden on the electricity bill can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram of a hot water storage type hot water heater in Embodiment 1 of the present invention. FIG. 2 is a diagram showing time zone classification in a seasonal time zone charge system. FIG. 3 is a block diagram of the hot water storage type water heater. 4] Configuration diagram of the hot water storage type water heater [FIG. 5] Configuration diagram of the hot water storage type water heater in Embodiment 2 of the present invention [FIG. 6] Configuration diagram of a conventional hot water storage type water heater [description of symbols]
DESCRIPTION OF SYMBOLS 20 Hot water storage tank 25 Heat source part 26 Upper temperature detection means 27 Middle temperature detection means 28 Lower temperature detection means 29 Clock 30 Time zone determination part 39 Required hot water amount determination part 40 Heat source part control request means

Claims (6)

A hot water storage tank, a heat source for boiling hot water in the hot water storage tank, a lower temperature detection means disposed at the lower part of the hot water storage tank, an upper temperature detection means disposed at the upper part of the hot water storage tank, and a charge by season A time zone determination unit that determines each time zone in the system, and the time zone determination unit determines that the time zone is a morning time zone / night time zone by season time zone, If the lower temperature detecting means detects that the temperature is lower than the predetermined temperature, the heating source is controlled to boil, and during the period when it is determined that it is daytime, the inside of the hot water storage tank is lower than the predetermined temperature. Even if the lower temperature detection means detects, while not performing the heating control by the heat source unit, even during the period when the time determination unit determines that it is a daytime period by season time zone, The upper temperature detection means If detected that is below the fixed temperature, storage-type water heater and performing control boiling by the heat source unit. When the upper temperature detecting means detects a predetermined temperature or less and starts boiling control by the heat source unit, the boiling temperature control is stopped when the upper temperature detecting means detects a predetermined temperature higher than the predetermined temperature. The hot water storage type water heater according to claim 1 . 2. The hot water storage type hot water heater according to claim 1 , wherein when the upper temperature detecting means detects a temperature equal to or lower than a predetermined temperature and starts the boiling control by the heat source unit, the boiling control is stopped when a predetermined time elapses. It is equipped with an intermediate temperature detection means located below the upper temperature detection means, and when the upper temperature detection means detects the temperature below a predetermined temperature and starts the heating control by the heat source part, the intermediate temperature detection means detects the temperature above the predetermined temperature. The hot water storage type water heater according to claim 1 , wherein the boiling-up control is stopped at the time when the hot water is heated.   It is equipped with a required hot water amount calculation unit that calculates the required hot water amount from the past usage status, and if the required hot water amount calculation unit determines that the required hot water amount cannot be obtained by boiling control after the end of the daytime period, the time zone determination If the lower temperature detection means detects that the inside of the hot water tank is below the specified temperature even during the period when the section is determined to be in the daytime by season, the boiling control by the heat source is performed. The hot water storage type water heater according to claim 1, wherein:   A heat source control requesting means for requesting control to the heat source part is provided, and when the user makes a request from the heat source part control requesting means, the time zone determination unit determines that it is a daytime time zone according to seasons 2. The hot water storage type hot water heater according to claim 1, wherein if the lower temperature detecting means detects that the inside of the hot water storage tank is at a predetermined temperature or lower during the period during which the hot water is stored, the boiling control by the heat source unit is performed.

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