JP2001330314A - Electric water-heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in a conventional electric water-heater in which water heat-up is done during the daytime hours at a higher electric rate, even when a hot-water supply can be managed if remaining water in a water-storage tank is used, especially in the time period after the evening till beginning of the night hours. SOLUTION: The electric water heater is provided with a heating body 8 having a power supply either in the daytime hours or in the night hours, a temperature sensor 9, a flow sensor 7 detecting hot-water supply volume other than a water-storage tank 2, a discriminator where to which time period the energization belongs, the daytime hours, or the night hours, and a memory means for storing past water-supply records detected by the sensor 7. When the flow sensor 7 detects in the daytime hours a water-supply amount of at least a predetermined amount corresponding to the past water-supply r supply record, the heating body 8 is energized to heat up water, and a time elapsed from the daytime hours is counted from the start of the daytime hours, and if the elapsed time has reached a predetermined time, the current-carrying to the heating body 8 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control for boiling an electric water heater using both daytime power and nighttime power systems.

[0002]

2. Description of the Related Art In general, the primary purpose of an electric water heater is to supply hot water as required by a user, and it has been necessary to eliminate running out of hot water in order to achieve this purpose. The configuration of the conventional electric water heater and the boiling control are shown below. FIG.
Is a configuration diagram of a conventional electric water heater, and FIG. 10 is an operation flowchart of the conventional electric water heater.

In FIG. 9, a hot water storage tank 2 for storing hot water is disposed in a water heater main body 1. A water supply pipe 3 is connected to the bottom of the hot water storage tank 2, and water is supplied to the hot water storage tank 2 at a constant pressure by a pressure reducing valve 5 provided in the middle of the water supply pipe 3. A hot water supply pipe 4 is connected to an upper portion of the hot water storage tank 2. Hot water heated in the hot water storage tank 2 is opened by opening a hot water supply valve (not shown) provided on the hot water supply pipe 4. The water is supplied to the kitchen, bath, or the like via the hot water supply pipe 4 by the action of the pressure, and an amount of water equal to the hot water supply amount is supplied from the water supply pipe 3 to the lower portion of the hot water storage tank 2. At this time, a pressure relief valve 6 is provided in the middle of the hot water supply pipe 4 in order to keep the inside of the hot water storage tank 2 at a constant pressure.

A heating element 8 for heating water in the hot water storage tank 2 is provided in a lower portion of the hot water storage tank 2, and a boiling temperature, a supply water temperature, and a remaining A temperature sensor 9 capable of detecting the amount of hot water is attached. Further, in the main body 1 of the water heater, there is installed a control unit 10 for detecting the energizing time zone from the current time or the like, determining whether the time zone is the daytime electric power or the nighttime electric power, and controlling the boiling of the hot water storage tank 2. Have been. The control unit 10 is an operation unit 11 such as a remote control, which is provided outside the heating element 8, the temperature sensor 9, and the main body 1 of the water heater and instructs a user to boil the hot water.
Is electrically connected to That is, the control unit 10 is configured to control the energization of the heating element 8 based on the detection value of the temperature sensor 8 and the input value from the operation unit 11.

Next, a description will be given of a boiling control operation of the conventional electric water heater having the above configuration with reference to an operation flowchart of FIG. First, in step S1, when the power supply (not shown) of the water heater main body 1 is turned on, the electric water heater starts energization control, and in step S2, the control unit 10 detects the current energization time zone from the current time or the like. I do. When the power supply time zone is detected, in step S3, the current daytime time zone (from 7:00 in the morning to 11:00 p.m.) or the night time zone (in the 11
It is determined which time zone it is from 7:00 to 7:00 the next morning).

If it is determined in step S3 that the current time is not during the daytime (in the case of nighttime), the flow advances to step S6 to start energizing the heating element 8, and the temperature sensor 9 detects the boiling temperature in step S7. When the boiling temperature is raised to a predetermined temperature T ° C, for example, 90 ° C,
In step S8, the power supply to the heating element 8 is stopped, and
At 9 the energization control ends. On the other hand, if it is determined in step S3 that it is during the daytime, the process proceeds to step S4, and the control unit 10 calculates the amount of remaining hot water in the hot water storage tank 2 based on the detection value of the temperature sensor 9. In other words, when the temperature sensor 9 detects the temperature of the supply water, it means that the low-temperature water has been pushed up to the temperature sensor 9 mounting position of the hot water storage tank 2, it means that there is no predetermined amount of remaining hot water, and the temperature sensor 9 When a temperature equal to or higher than the water temperature is detected, hot water is secured at least above the mounting position of the temperature sensor 9, which means that there is a remaining amount of hot water equal to or more than a predetermined amount.

Accordingly, in step S5, the control unit 10 determines the remaining hot water amount, and when it is determined that the remaining hot water amount is less than the predetermined amount, proceeds to step S6, and secures the predetermined hot water amount in a sense of preventing running out of hot water. Therefore, the power supply to the heating element 8 is started, and the water in the hot water storage tank 2 is cooled to a predetermined temperature T ° C. (90 ° C.).
° C), the process proceeds to step S8, and the energization is stopped, and the energization control ends in step S9. On the other hand, if the controller 10 determines in step S5 that the remaining amount of hot water is equal to or more than the predetermined amount, the process returns to step S2 since there is no need to worry about running out of hot water and the required amount of hot water is secured. Is not performed.

[0008]

The conventional electric water heater is
During the daytime power period, the temperature of the water at the temperature sensor 6 mounting portion of the hot water storage tank 2 is detected, and the presence or absence of a predetermined amount or more of the remaining hot water amount is determined based on whether or not there is hot water from the detected value to the temperature sensor 6 mounting portion. It was to judge. And hot water storage tank 2
In order to prevent the inside of the hot water from running out, when the remaining hot water amount becomes equal to or less than a predetermined amount, the power supply to the heating element 8 is immediately started to start boiling. Therefore, the daytime power zone (from 7:00 a.m. to 11
Despite the fact that electricity bills are set higher during the evening, during the evening hours when hot water is used a lot during the day,
There has been a problem that the heating element 8 is most often energized and heated. In particular, this tendency was more remarkable as the mounting position of the temperature sensor 6 was lower in the hot water storage tank 2.

[0009] In addition, in order to boil to the same temperature in the daytime power zone as the temperature in the nighttime power zone,
There was a problem that the electricity cost was high during the daytime hours when the electricity cost was high and the electricity cost was high. Furthermore, even in summer, when the amount of hot water used is small, the same heating control as in winter is performed, so that there is a problem that the electricity bill is unnecessarily high in summer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and restricts the supply of electricity to unnecessary heating elements during the daytime when electric power is high, thereby reducing the electricity bill. It is an object of the present invention to provide an electric water heater that can be kept inexpensive and can prevent running out of hot water.

[0011]

SUMMARY OF THE INVENTION The present invention provides a heating means to which daytime or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, and a temperature sensor for detecting a boiling temperature and a feedwater temperature. And a flow sensor for detecting the amount of hot water supplied to the outside, a storage means for storing past hot water supply results detected by the flow sensor, and an energizing time zone in which a daytime electric power or a nighttime electric power is supplied. Determination means for determining whether or not there is a battery, and when the flow rate sensor detects a predetermined hot water supply amount, energization of the heating means is started to raise the water temperature to the boiling temperature, and a lapse of time from the start of daytime power supply. When the elapsed time reaches a predetermined time after counting the time, the power supply to the heating means is stopped, and the power supply to the heating means is performed in accordance with the past hot water supply amount stored in the storage means. It is obtained so as to change the predetermined hot water amount to start.

Further, the present invention provides a heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature, and Flow rate sensor for detecting the amount of hot water supply, storage means for storing past hot water supply amount results detected by the flow rate sensor, and determining whether the energizing time period is a time period during which daytime electric power or nighttime electric power is supplied. When the flow rate sensor detects a predetermined hot water supply amount, the power supply to the heating means is started to raise the water temperature to the boiling temperature, and the elapsed time from the start of the daytime power supply is counted. When the elapsed time reaches a predetermined time, the power supply to the heating means is stopped, and the power supply to the heating means is stopped according to the past hot water supply amount stored in the storage means. It is obtained so as to change a constant time.

Further, in the present invention, the predetermined time during which the power supply to the heating means is stopped is changed according to the past amount of hot water supply stored in the storage means.

The present invention also provides a heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature, and Flow rate sensor for detecting the amount of hot water supply, storage means for storing past hot water supply amount results detected by the flow rate sensor, and determining whether the energizing time period is a time period during which daytime electric power or nighttime electric power is supplied. When the flow rate sensor detects a predetermined hot water supply amount, the power supply to the heating means is started to raise the water temperature to the boiling temperature, and the elapsed time from the start of the daytime power supply is counted. When the elapsed time reaches a predetermined time, the power supply to the heating means is stopped, and the past hot water supply results stored in the storage means and the water supply water temperature detected by the temperature sensor are detected. It is obtained so as to change the predetermined hot water amount for starting the energization of the heating means in accordance with a value.

Further, the present invention provides a heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature, and Flow rate sensor for detecting the amount of hot water supply, storage means for storing past hot water supply amount results detected by the flow rate sensor, and determining whether the energizing time period is a time period during which daytime electric power or nighttime electric power is supplied. When the flow rate sensor detects a predetermined hot water supply amount, the power supply to the heating means is started to raise the water temperature to the boiling temperature, and the elapsed time from the start of the daytime power supply is counted. When the elapsed time reaches a predetermined time, the power supply to the heating means is stopped, and the past hot water supply results stored in the storage means and the water supply water temperature detected by the temperature sensor are detected. It is obtained so as to change the predetermined time to stop the power supply to the heating means in accordance with a value.

In the present invention, the predetermined time for stopping the power supply to the heating means is also changed according to the past hot water supply amount results stored in the storage means and the supply water temperature.

Further, according to the present invention, the boiling temperature in the daytime zone is set lower than the boiling temperature in the nighttime zone, and the boiling temperature is changed according to the detected value of the feed water temperature detected by the temperature sensor. It was done.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of an electric water heater according to Embodiment 1 of the present invention, FIG. 2 is a block diagram of an electric water heater according to Embodiment 1 of the present invention, and FIG.
3 is an operation flowchart of the electric water heater according to Embodiment 1 of the present invention. 1 and 6, 8 in FIGS.
11 to 11 have exactly the same configuration as the conventional example shown in FIG. Reference numeral 7 denotes a flow sensor 7 for detecting the amount of hot water supplied from the hot water storage tank 2, and is provided in the middle of the hot water supply side pipe 4. The flow rate sensor 7 can detect the amount of hot water flowing out in an analog manner. The flow rate sensor 7 has a higher accuracy than a sensor that detects the amount of remaining hot water using the temperature sensor 9, and the timing for starting the boiling is determined by the temperature sensor 9. It does not depend on the mounting position of.

The control unit 10 detects the energizing time zone from the current time or the like and determines whether the energizing time zone is daytime electric power or nighttime electric power. There is provided storage means for storing a hot water supply amount, for example, an integrated hot water supply amount in the past one day.

Next, the boiling operation of the electric water heater according to Embodiment 1 of the present invention having the above configuration will be described with reference to the operation flowchart of FIG. First, when a power supply (not shown) of the water heater main body 1 is turned on, energization control is started (step S101), and the control unit 10 detects an energization time zone from the current time or the like (step S102). When the power supply time zone is detected, it is determined whether the current time zone is a daytime time zone (from 7:00 am to 11:00 pm) or a night time zone (from 11:00 pm to 7:00 am the next morning) (step S <b> 103). .

If it is not during the daytime, that is, if it is during the nighttime (NO in step S103), the power supply to the heating element 8 is started (step S113), the hot water temperature is detected by the temperature sensor 9, and the hot water temperature is set to a predetermined value. Boiling temperature T (90
° C) (Step S114), the power supply to the heating element 8 is stopped (Step S115), and the power supply control is terminated (Step S116). On the other hand, if it is during the daytime (YES in step S103), the actual amount of hot water used in the past day detected by the flow sensor 7 and stored in the storage unit of the control unit 10 (step S10).
It is determined whether or not 4) exceeds the predetermined amount (step S105), that is, whether or not the actual amount of hot water used in the past is large. That is, when the actual amount of hot water used in the past is equal to or more than the predetermined amount, it is determined that the amount of hot water to be used in the future is large, and when the actual amount of hot water is less than the predetermined amount, it is determined that the amount of hot water to be used in the future is small.

The amount of hot water supply per day used in the past is 30
If it is 0 L or more (YES in step and 105), it can be determined that the amount of hot water to be used in the future is large, and the flow sensor 7 detects the amount of hot water during the daytime (after 7:00 in the morning) (step S10).
6) If the hot water is not supplied more than the predetermined amount (100 L) (NO in step S107), it can be determined that there is a lot of hot water in the hot water storage tank 2, and the amount of hot water necessary to prevent running out of hot water is secured. No boiling is performed. On the other hand, when hot water is supplied at a predetermined amount (100 L) or more (step S10).
7), it can be determined that the amount of hot water in the hot water storage tank 2 is low, and energization is started in order to eliminate running out of hot water and secure a predetermined amount of hot water (step S110). Next, the elapsed time from the start of the daytime time zone is counted, and it is determined whether or not a predetermined time (for example, 10 hours) has elapsed, that is, whether or not 5:00 in the evening has passed (step S111). When 10 hours or more have elapsed (YES in step S111), the power supply is stopped (step S115). On the other hand, if the elapsed time has not elapsed for 10 hours or more (NO in step S111), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S112). ). If it has exceeded, the energization is stopped (step S115), and the energization control ends (step S116). If not exceeded (NO in step S112), energization is continued.

The amount of hot water supply per day used in the past is 30
If it is 0 L or less (NO in step S105), it is determined that the amount of hot water to be used in the future is small, and the flow sensor 7 detects the amount of hot water during the daytime (after 7:00 in the morning) (step S10).
8). Here, since it is determined that the amount of water to be used in the future is small, the predetermined hot water supply amount at the start of boiling is changed from 100 L to 150 L.
Has been changed to. If the hot water is not supplied more than the predetermined amount (150 L) (NO in step S109), it can be determined that there is a lot of hot water in the hot water storage tank 2, and the amount of hot water required to prevent running out of hot water is secured. Do not raise. On the other hand, when it is determined that the hot water is supplied by the predetermined amount (150 L) or more (YES in step S109), it can be determined that the amount of hot water in hot water storage tank 2 is low, and in order to eliminate the hot water and secure the predetermined amount of hot water. The energization is started (step S110). Next, when power supply of daytime power is started, the elapsed time from the start of the daytime time zone is counted, and whether or not a predetermined time (for example, 10 hours) has elapsed, that is, whether or not 5:00 in the evening has passed. A determination is made (step S111). When 10 hours or more have elapsed (YES in step S111), the power supply is stopped (step S115). On the other hand, if the elapsed time has not elapsed for 10 hours or more (NO in step S111), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S112). ). If it exceeds, the energization is stopped to end the boiling control (step S115), and the energization control is ended (step S116). If not exceeded (step S
112 (NO), the energization is continued.

That is, in this embodiment, 1 means that energization in the daytime period is limited to a predetermined time (10 hours) from the start of power supply in the daytime period, and according to the actual amount of hot water supply in the past day. The amount of hot water to be used in the future is determined, and when the amount of hot water to be used in the past is small, the predetermined hot water supply at the start of boiling is set to a large value to control so that the energizing time to the heating element 8 during the daytime is reduced. I have. Therefore, the amount of power used during the daytime hours when the electricity bill is high is limited, and the electricity bill can be reduced while running out of hot water.

Embodiment 2 FIG. 4 is an operation flowchart of an electric water heater according to Embodiment 2 of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the boiling operation of the electric water heater according to Embodiment 2 of the present invention will be described with reference to FIGS. 1, 2 and 4. The operation in the night time zone is the same as that of the first embodiment, and only the parts different from the first embodiment will be described below. If it is during the daytime, the actual amount of hot water used in the past one day (step S104) stored in the storage unit of the control unit 10 detected by the flow rate sensor 7 is equal to the predetermined amount 30.
0L, that is, whether the amount of hot water used in the past is large (step S10)
5).

The amount of hot water supply per day used in the past is 30
If it is 0 L or less (NO in step S105), it is determined that the amount of hot water to be used in the future is small, and the flow sensor 7 detects the amount of hot water during the daytime (after 7:00 in the morning) (step S10).
8). Here, since it is determined that the future usage is small, the boiling limit time is changed from 5:00 (10 hours) in the evening to 12:00 noon (5 hours) at noon, and the energization time is reduced. If the hot water is not supplied more than the predetermined amount (100 L) (NO in step S109), it can be determined that there is a lot of hot water in the hot water storage tank 2, and the amount of hot water necessary to prevent running out of hot water is secured. Do not raise. On the other hand, when hot water is supplied at a predetermined amount (100 L) or more (step S109)
YES), it can be determined that the amount of hot water in the hot water storage tank 2 is low, and energization is started in order to eliminate running out of hot water and secure a predetermined amount of hot water (step S117). Next, the elapsed time from the start of the daytime time zone is counted, and a predetermined time (5
Time) has passed, ie noon 1
It is determined whether 2:00 has passed (step S11).
8). When the elapsed time has elapsed for 5 hours or more (step S1
18 (YES), the energization is stopped (step S11).
5). On the other hand, when the elapsed time has not elapsed for 5 hours or more (NO in step S118), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S119). ). If it has exceeded, the energization is stopped (step S115), and the energization control ends (step S116). If not exceeded (NO in step S119), energization is continued.

That is, in the second embodiment, energization during the daytime period is limited to within a predetermined time (10 hours) from the start of power supply during the daytime period. When the past hot water supply amount is small, the energizing time to the heating element 8 in the daytime period is set to a short energizing time (5 hours) to further limit. Therefore, the amount of electricity in the daytime hours when the electricity bill is high is limited, and the electricity bill can be further reduced while preventing running out of hot water.

Third Embodiment FIG. 5 is an operation flowchart of an electric water heater according to a third embodiment of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of controlling the boiling of the electric water heater according to the third embodiment of the present invention will be described with reference to FIGS. The operation in the night time zone is described in the first embodiment.
In the following, only parts different from the first embodiment will be described.

The amount of hot water supply per day used in the past is 30
If it is 0 L or less (NO in step S105), it is determined that the amount of hot water to be used in the future is small, and the flow sensor 7 detects the amount of hot water during the daytime (after 7:00 in the morning) (step S10).
8). Here, since it is determined that the amount of water to be used in the future is small, the predetermined hot water supply amount at the start of boiling is changed from 100 L to 150 L.
And set the boiling time limit to 5 o'clock in the evening (10
Hours) to 12:00 noon (5 hours) to reduce the energization time. If the hot water is not supplied more than the predetermined amount (150 L) (NO in step S109), it can be determined that there is a lot of hot water in the hot water storage tank 2, and the amount of hot water required to prevent running out of hot water is secured. Do not raise. On the other hand, if the hot water is supplied by the predetermined amount (150 L) or more (YES in step S109), it can be determined that the amount of hot water in hot water storage tank 2 is low, and energization is started to eliminate the hot water and secure the predetermined amount of hot water. (Step S11
7). Next, the elapsed time from the start of the daytime time zone is counted to determine whether or not a predetermined time (5 hours) has elapsed.
That is, it is determined whether or not it is past 12:00 noon (step S118). When the elapsed time has elapsed for 5 hours or more (YES in step S118), the power supply is stopped (step S115). On the other hand, if the elapsed time has not elapsed for 5 hours or more (NO in step S118), it is determined whether the temperature of the hot water in hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S118). S119). If it exceeds (YES in step S119), the energization is stopped (step S115), and the energization control is ended (step S116). If not exceeded (step S
(NO in step 119), the energization is continued.

That is, in the third embodiment, energization in the daytime period is performed for a predetermined time (10 hours) from the start of power supply in the daytime period.
The amount of hot water to be used is determined in accordance with the amount of hot water in the past, and if the amount of hot water in the past is small, the amount of hot water to be boiled is increased and the amount of heat to the heating element 8 during the daytime is increased. The power supply time is controlled so as to be short, and the power supply time to the heating element 8 during the daytime is limited to a short power supply time (5 hours). Therefore, the amount of power in daytime hours when the electricity bill is higher than in the first and second embodiments is limited, and the electricity bill can be further reduced while preventing running out of hot water.

Fourth Embodiment FIG. 6 is an operation flowchart of an electric water heater according to a fourth embodiment of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of the electric water heater according to Embodiment 4 of the present invention will be described with reference to FIGS. 1, 2 and 6. The operation in the night time zone is the same as that of the first embodiment, and only the parts different from the first embodiment will be described below.
The difference from the first embodiment is that the predetermined hot water supply amount at the start of boiling in the daytime period is changed in consideration of not only the past hot water supply results but also the feedwater temperature.

In the operation flowchart of FIG. 6, if it is during the daytime (YES in step S203), the actual amount of hot water used in the past one day stored in the control unit 10 and detected by the flow rate sensor 7 ( It is determined whether or not the value of step S204 exceeds the predetermined amount (step S205), that is, whether or not the amount of hot water used in the past is large. That is, if the self-responsibility of the hot water supply used in the past is equal to or more than the predetermined amount, it is determined that the future hot water supply is large, and if it is equal to or less than the predetermined amount, it is determined that the future hot water supply is small.

The amount of hot water supply for one day used in the past is 30
If it is 0 L or more (YES in step S205), it can be determined that the amount of hot water to be used in the future is large, and the temperature sensor 9 detects the temperature of the supplied water (step S206). When the supply water temperature is equal to or lower than the predetermined temperature (15 ° C.) (YE in step S207)
S), It is determined that it is winter, when the amount of hot water to be used in the future is large, and when the temperature of the supplied water is equal to or higher than a predetermined value, it is determined to be summer in which the amount of hot water to be used is small. Next, the flow rate sensor 7 detects the amount of hot water during the daytime (after 7 o'clock in the morning) (step S208), and if the hot water is not supplied more than the predetermined amount (100L) (step S2).
(09: NO), it can be determined that there is a lot of hot water in the hot water storage tank 2, and since the amount of hot water necessary to prevent running out of hot water is secured, no boiling is performed. On the other hand, a predetermined amount (100
L) When the hot water is supplied more than (YE in step S209)
S), it can be determined that the amount of hot water in the hot water storage tank 2 is low, and energization is started in order to eliminate running out of hot water and to secure a predetermined amount of hot water (step S216). Next, the elapsed time from the start of the daytime time zone is counted, and a predetermined time (for example, 1) is counted.
(Time 0) has elapsed, that is, whether it has passed 5:00 in the evening (step S21).
7). If the elapsed time has passed 10 hours or more (step S
(YES at 217), the energization is stopped (step S22).
1), the energization control ends (step S222). On the other hand, if the elapsed time has not elapsed for 10 hours or more (NO in step S217), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S218). ). If it exceeds (YES in step S218), the power supply is stopped (step S218).
221), the energization control ends (step S222).
If not exceeded (N in step S218)
O), energization is continued.

The actual amount of hot water supply per day used in the past is 30
If it is 0 L or less (NO in step S205), it is determined that the amount of hot water to be used in the future is small, and the temperature of the water supply water is detected by the temperature sensor 9 (step S210). When the supply water temperature is equal to or lower than the predetermined temperature (15 ° C.) (YES in step S211),
The flow rate sensor 7 detects the hot water supply amount during the daytime (after 7:00 in the morning) (step S212). Here, since it is determined that the amount to be used in the future is small, the predetermined hot water supply amount at the start of boiling is changed from 100 L to 125 L. Predetermined amount (12
If the hot water is not supplied more than 5L) (NO in step S213), it can be determined that there is a lot of hot water in the hot water storage tank 2,
Since the amount of hot water necessary to prevent running out of hot water is secured, no boiling is performed. On the other hand, when hot water is supplied at a predetermined amount (125 L) or more (YES in step S213), it can be determined that the amount of hot water in hot water storage tank 2 is low, and energization is started in order to eliminate hot water and secure a predetermined amount of hot water. (Step S216). Next, the elapsed time from the start of the daytime time zone is counted, and it is determined whether or not a predetermined time (for example, 10 hours) has elapsed, that is, whether or not 5:00 has passed in the evening (step S217). When the elapsed time has elapsed for 10 hours or more (YE in step S217)
S), the energization is stopped (step S221). On the other hand, when the elapsed time has not elapsed for 10 hours or more (step S
217), it is determined whether or not the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S818). When it exceeds, the energization is stopped (step S221), and the energization control is ended (step S222). If not exceeded (NO in step S218), energization is continued.

When the supply water temperature is equal to or higher than the predetermined temperature (15 ° C.) (NO in step S211), the flow sensor 7 detects the amount of hot water supplied during the daytime (after 7:00 in the morning) (step S214). Here, since it is determined that the future consumption is even smaller, the predetermined hot water supply amount at the start of boiling is set to 100L.
To 150L. If it is determined that the hot water is not supplied more than the predetermined amount (150 L) (NO in step S215), it can be determined that there is a lot of hot water in the hot water storage tank 2,
Since the amount of hot water necessary to prevent running out of hot water is secured, no boiling is performed. On the other hand, if the hot water is supplied by a predetermined amount (150 L) or more (YES in step S215), it can be determined that the amount of hot water in hot water storage tank 2 is low, and energization is started to eliminate the hot water and secure a predetermined amount of hot water. (Step S216). Next, the elapsed time from the start of the daytime time zone is counted, and it is determined whether or not a predetermined time (for example, 10 hours) has elapsed, that is, whether or not 5:00 has passed in the evening (step S217). When the elapsed time has elapsed for 10 hours or more (YE in step S217)
S), the energization is stopped (step S221). On the other hand, when the elapsed time has not elapsed for 10 hours or more (step S
217), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S218). When it exceeds, the energization is stopped (step S221), and the energization control is ended (step S222). If not exceeded (NO in step S218), energization is continued.

That is, in the fourth embodiment, energization in the daytime period is performed for a predetermined time (10 hours) from the start of power supply in the daytime period.
It is limited to within, and also determines the amount of hot water to be used in the future according to the past hot water supply results and the temperature of the water supply, and starts boiling when the past water supply is low and the water supply temperature is high, in other words, in the summer. The amount of hot water supplied is controlled so as to reduce the power supply time to the heating element 8 during the daytime. Therefore, the amount of power in the daytime period when the electricity bill is higher than in the case of Embodiment 1 is limited, and the electricity bill can be further reduced while reliably preventing running out of hot water.

Embodiment 5 FIG. 7 is an operation flowchart of an electric water heater according to Embodiment 5 of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of controlling the boiling of the electric water heater according to the fifth embodiment of the present invention will be described with reference to FIGS. 1, 2 and 7. The operation in the night time zone is the same as that of the fourth embodiment, and the parts different from the fourth embodiment will be described below. The difference from the fourth embodiment is that the power supply restriction time in the daytime is changed according to the temperature of the water supply.

In FIG. 7, when the actual amount of hot water supply for one day used in the past is 300 L or less (NO in step S205), it is determined that the amount of hot water to be used in the future is small, and the temperature of the water supply water is detected by the temperature sensor 9. (Step S210). When the feedwater temperature is equal to or lower than the predetermined temperature (15 ° C.) (step S21)
1 (YES), the flow rate sensor 7 detects the hot water supply amount during the daytime (after 7:00 in the morning) (step S212). Here, since it is determined that the future use amount is small, the boiling time limit time is changed from 5:00 (10 hours) in the evening to 2:00 (7 hours) in the afternoon, and the energizing time is reduced. Predetermined amount (1
00L) or more (step S213)
NO), it can be determined that there is a lot of hot water in the hot water storage tank 2, and since the amount of hot water necessary to prevent running out of hot water is secured, no boiling is performed. On the other hand, a predetermined amount (100
L) If more than the hot water is supplied (YE in step S213)
S), it can be determined that the amount of hot water in the hot water storage tank 2 is low, and energization is started in order to eliminate the running out of hot water and secure a predetermined amount of hot water (step S223). Next, the elapsed time from the start of the daytime time zone is counted, and a predetermined time (7 hours) is counted.
Is determined, that is, whether 2:00 pm has passed (step S224). If the elapsed time has exceeded 7 hours (Y in step S224)
ES), the energization is stopped (step S221). on the other hand,
If the elapsed time has not elapsed for more than 7 hours (step S
224), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S225). When it exceeds, the energization is stopped (step S221), and the energization control is ended (step S222). If not exceeded (NO in step S225), energization is continued.

If the supply water temperature is equal to or higher than the predetermined temperature (15 ° C.) (NO in step S211), the flow sensor 7 detects the amount of hot water supplied during the daytime (after 7:00 in the morning) (step S214). Here, since it can be determined that the future usage is small, the boiling time limit is changed from 5 o'clock in the evening (10 hours) to 12:00 noon (5 hours), and the energizing time is further reduced. If the hot water is not supplied more than the predetermined amount (100 L) (NO in step S215), it can be determined that there is a lot of hot water in the hot water storage tank 2, and the amount of hot water necessary to prevent running out of hot water is secured. Do not raise. On the other hand, if the hot water is supplied by a predetermined amount (100 L) or more (YES in step S215), it can be determined that the amount of hot water in hot water storage tank 2 is low, and energization is started in order to eliminate the hot water and secure a predetermined amount of hot water. (Step S226). Next, the elapsed time from the start of the daytime time zone is counted, and it is determined whether or not a predetermined time (5 hours) has elapsed, that is, whether or not 12 noon has passed (step S227). When the elapsed time has elapsed for 5 hours or more (YES in step S227), the power supply is stopped (step S2).
21). On the other hand, when the elapsed time has not elapsed for 5 hours or more (NO in step S227), it is determined whether the temperature of the hot water in the hot water storage tank 2 exceeds a predetermined boiling temperature T (90 ° C.) (step S228). ). When it exceeds, the energization is stopped (step S221), and the energization control is ended (step S222). If not exceeded (NO in step S228), energization is continued until 5 hours have elapsed.

That is, in the fifth embodiment, energization in the daytime period is performed for a predetermined time (10 hours) from the start of power supply in the daytime period.
It is limited to within the range, and also determines the amount of hot water to be used in the future according to the past hot water supply results and the water temperature, and if the past hot water volume is low and the water temperature is high, in other words, in the summer, The energization time to the heating element 8 is set to a short energization time (5 hours), and is further reduced. Therefore, the amount of power in the daytime period when the electricity cost is higher than in the case of Embodiment 2 is limited, and the electricity cost can be further reduced while reliably preventing running out of hot water.

Embodiment 6 FIG. 8 is an operation flowchart of an electric water heater according to Embodiment 6 of the present invention. Note that the basic configuration of the electric water heater is the same as that of the first embodiment, and a description thereof will be omitted. Further, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, the operation of controlling the boiling of the electric water heater according to the sixth embodiment of the present invention will be described with reference to FIGS. 1, 2 and 8. The operation in the night time zone is the same as that of the fifth embodiment, and the different points from the fifth embodiment will be described below. The difference from the fifth embodiment is that the boiling temperature in the daytime is changed in accordance with past hot water supply results and feed water temperature.

The actual amount of hot water supply per day used in the past is 30
0L or more (YES in step S205), and when the feedwater temperature is equal to or lower than a predetermined temperature (15 ° C) (step S2).
07 (YES in step S209), and when a predetermined amount (100 L) or more is supplied (YES in step S209), the boiling temperature in the daytime is set to T1 (80 ° C.) (step S21).
8). In addition, the actual amount of hot water used for one day
0L or less (NO in step S205), and when the feedwater temperature is equal to or less than a predetermined temperature (15 ° C) (step S21).
1) (YES in step S213), and when the hot water is supplied more than the predetermined amount (125L) (YES in step S213), the boiling temperature in the daytime is set to T2 (70 ° C) (step S22).
5). In addition, the actual amount of hot water
00L or less (NO in step S205), and when the feedwater temperature is equal to or higher than a predetermined temperature (15 ° C) (step S2).
11 (NO in step S215), when the predetermined amount (150L) or more is supplied (YES in step S215), the boiling temperature during the daytime is set to T3 (50 ° C) (step S22).
8).

That is, in the sixth embodiment, the energization in the daytime period is performed for a predetermined time (10 hours) from the start of the power supply in the daytime period.
It is limited to within, and also determines the amount of hot water to be used in the future according to the past hot water supply performance and the temperature of the water supply, and if the past hot water supply performance is low and the water supply water temperature is high, in other words, in the summer, Increase the amount of hot water to start heating and control so that the energizing time to the heating element 8 during the daytime is reduced, and limit the energizing time to the heating element 8 during the daytime to a short energizing time (5 hours) And the boiling temperature T at night time
(90 ° C), the boiling temperature T1, T2 during the daytime
T3 is lowered (T1 = 80 ° C., T2 = 7)
0 ° C, T3 = 50 ° C). Therefore, the amount of electricity during the daytime hours when the electricity bill is high is limited, and while reliably preventing running out of hot water,
Further, the electricity bill can be further reduced.

In the first to sixth embodiments, the heating element 8 is used as a heating device for raising the temperature of the hot water storage tank 2. However, the present invention is not limited to this. A vessel may be used. Embodiment 1
In the first to sixth embodiments, only one temperature sensor 6 for measuring the boiling temperature, the feed water temperature, and the temperature of the temperature sensor mounting portion is provided, but the present invention is not limited to this, and the respective temperatures are measured using separate sensors. It can also be measured. Control unit 1
Although the measurement timing of the past used hot water supply amount stored in the storage means of 0 is not particularly described, it is preferable that the measurement is performed for one day from the start of the daytime zone to the end of the nighttime zone. Needless to say, the data of the actual amount of hot water stored in the storage means is automatically updated.

In the first to sixth embodiments, the flow rate sensor 7 is provided in the middle of the hot water supply pipe 4 to directly detect the hot water supply amount. However, the present invention is not limited to this. A method of providing a flow sensor 7 in the middle of the side pipe 3 and indirectly detecting the hot water supply amount from the water supply amount may be employed. Further, the past hot water supply results stored in the control unit 10 have been described with reference to the hot water supply results used in the past one day, but the average hot water supply results in the past one day in a past unit period (for example, one week). Etc. may be used.

[0051]

As is apparent from the above invention, in the electric water heater according to the present invention, energization in the daytime period is limited to within a predetermined time from the start of power supply in the daytime period. When the amount is small, the amount of hot water supplied at the start of boiling is increased to control the energization time to the heating element during the daytime, so that it is unnecessary for the heating element during the daytime when electricity costs are high. The present invention can provide an electric water heater that restricts electricity supply as much as possible, keeps electricity costs low, and achieves prevention of running out of hot water, which is the original purpose of an electric water heater.

In the electric water heater according to the present invention, energization in the daytime is limited to a predetermined time from the start of power supply in the daytime. Since the energizing time to the heating element is set to a short energizing time and is further reduced, the energizing of unnecessary heating elements during the daytime period when the electric bill is high is limited as much as possible to suppress the electricity bill cheaply, and It is possible to provide an electric water heater that achieves the prevention of running out of hot water, which is the original purpose of the electric water heater.

Further, in the electric water heater according to the present invention, energization in the daytime period is limited to within a predetermined time from the start of power supply in the daytime period. Since the power supply to the heating element during the daytime is controlled to be short by increasing the predetermined hot water supply amount, and the power supply time to the heating element during the daytime is limited to a short time, the electricity bill is reduced. Limit electricity supply to unnecessary heating elements during high daytime hours as much as possible to keep electricity costs low, and
It is possible to provide an electric water heater that achieves the prevention of running out of hot water, which is the original purpose of the electric water heater.

Further, in the electric water heater according to the present invention, energization in the daytime period is limited to within a predetermined time from the start of power supply in the daytime period. Since the power supply to the heating element during the daytime period is controlled to be short by increasing the predetermined hot water supply amount at the start of boiling, it is possible to energize unnecessary heating elements during the daytime period when the electricity bill is high. It is possible to provide an electric water heater that restricts electricity costs at a low price and achieves prevention of running out of hot water, which is the original purpose of the electric water heater.

Further, in the electric water heater according to the present invention, energization in the daytime is limited to a predetermined time from the start of power supply in the daytime, and when the past hot water supply amount is small and the water supply water temperature is high, Since the energizing time to the heating element during the daytime is reduced to a shorter energizing time, the energizing of unnecessary heating elements during the daytime when electricity is high is limited as much as possible to keep the electricity bill inexpensive. In addition, it is possible to provide an electric water heater that achieves the prevention of running out of hot water, which is the original purpose of the electric water heater.

In the electric water heater according to the present invention, energization during the daytime is limited to a predetermined time from the start of power supply during the daytime, and when the past actual amount of hot water supply is small and the supply water temperature is high, By increasing the predetermined hot water supply amount at the start of boiling to control the energizing time to the heating element 5 during the daytime to be short, and restricting the energizing time to the heating element during the daytime to a short energizing time. Electric water heater that limits unnecessary electricity supply to unnecessary heating elements during the daytime hours when electricity costs are high, keeps electricity costs low, and achieves the original purpose of water heaters to prevent running out of hot water Can be provided.

Further, in the electric water heater according to the present invention, the boiling temperature in the daytime period is lower than the boiling temperature in the nighttime period, and the boiling temperature is changed in accordance with the temperature of the water supply. It is possible to provide an electric water heater that limits unnecessary power supply to unnecessary heating elements during a daytime period when the cost is high, suppresses electricity costs inexpensively, and achieves prevention of running out of hot water which is the original purpose of the electric water heater.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electric water heater according to Embodiment 1 of the present invention.

FIG. 2 is a control block diagram of the electric water heater according to Embodiment 1 of the present invention.

FIG. 3 is an operation flowchart of the electric water heater according to Embodiment 1 of the present invention.

FIG. 4 is an operation flowchart of an electric water heater according to Embodiment 2 of the present invention.

FIG. 5 is an operation flowchart of an electric water heater according to Embodiment 3 of the present invention.

FIG. 6 is an operation flowchart of an electric water heater according to Embodiment 4 of the present invention.

FIG. 7 is an operation flowchart of an electric water heater according to Embodiment 5 of the present invention.

FIG. 8 is an operation flowchart of an electric water heater according to Embodiment 6 of the present invention.

FIG. 9 is a configuration diagram of a conventional electric water heater.

FIG. 10 is an operation flowchart of a conventional electric water heater.

[Explanation of symbols] Water heater body, 2 hot water storage tank, 3 water supply side piping,
4 hot water supply side piping, 7 flow rate sensor, 8 heating element, 9
Temperature sensor, 10 control unit, 11 operation unit.

Continued on the front page (72) Inventor Ritsuichi Hiramoto 2-6-1, Otemachi, Chiyoda-ku, Tokyo F-term (reference) in Mitsubishi Electric Engineering Co., Ltd. 3L025 AB21

Claims (7)

[Claims] 1. A heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature,
A flow rate sensor that detects the amount of hot water to the outside, and a storage unit that stores past hot water supply results detected by the flow rate sensor,
Determining means for determining whether the energizing time zone is a time zone in which daytime power or nighttime power is supplied, and when the flow rate sensor detects a predetermined hot water supply amount, energizing the heating means is started. And raise the water temperature to the boiling temperature, count the elapsed time from the start of daytime power supply, and when the elapsed time reaches a predetermined time, stop energizing the heating means, and store in the storage means. An electric water heater characterized by changing a predetermined hot water supply amount at which energization of the heating means is started in accordance with a stored past hot water supply result. 2. A heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature,
A flow rate sensor that detects the amount of hot water to the outside, and a storage unit that stores past hot water supply results detected by the flow rate sensor,
Determining means for determining whether the energizing time zone is a time zone in which daytime power or nighttime power is supplied, and when the flow rate sensor detects a predetermined hot water supply amount, energizing the heating means is started. And raise the water temperature to the boiling temperature, count the elapsed time from the start of daytime power supply, and when the elapsed time reaches a predetermined time, stop energizing the heating means, and store in the storage means. An electric water heater characterized in that a predetermined time during which the power supply to the heating means is stopped is changed in accordance with the stored past hot water supply results. 3. The electric water heater according to claim 1, wherein a predetermined time during which the power supply to said heating means is stopped is changed according to a past hot water supply amount stored in said storage means. 4. A heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature,
A flow rate sensor that detects the amount of hot water to the outside, and a storage unit that stores past hot water supply results detected by the flow rate sensor,
Determining means for determining whether the energizing time zone is a time zone in which daytime power or nighttime power is supplied, and when the flow rate sensor detects a predetermined hot water supply amount, energizing the heating means is started. And raise the water temperature to the boiling temperature, count the elapsed time from the start of daytime power supply, and when the elapsed time reaches a predetermined time, stop energizing the heating means, and store in the storage means. An electric water heater characterized in that a predetermined hot water supply amount at which the energization of the heating means is started is changed according to stored past hot water supply results and a detected value of a feed water temperature detected by the temperature sensor. 5. A heating means to which daytime power or nighttime power is supplied, a hot water storage tank for storing water heated by the heating means, a temperature sensor for detecting a boiling temperature and a supply water temperature,
A flow rate sensor that detects the amount of hot water to the outside, and a storage unit that stores past hot water supply results detected by the flow rate sensor,
Determining means for determining whether the energizing time zone is a time zone in which daytime power or nighttime power is supplied, and when the flow rate sensor detects a predetermined hot water supply amount, energizing the heating means is started. And raise the water temperature to the boiling temperature, count the elapsed time from the start of daytime power supply, and when the elapsed time reaches a predetermined time, stop energizing the heating means, and store in the storage means. An electric water heater characterized in that a predetermined time during which power supply to the heating means is stopped is changed in accordance with stored past hot water supply results and a detected value of feed water temperature detected by the temperature sensor. 6. The electric water heater according to claim 4, wherein the predetermined time during which the power supply to said heating means is stopped is changed according to the past hot water supply amount results stored in said storage means and the supply water temperature. 7. The method according to claim 1, wherein the boiling temperature during the daytime is set lower than the boiling temperature during the nighttime, and the temperature is changed according to the value of the feedwater temperature detected by the temperature sensor. Item 7. An electric water heater according to items 1 to 6.