JPH01208659A - Boiling control device for electrical hot-water heater - Google Patents

Abstract

PURPOSE:To realize a boiling temperature control which is most suitable for a distribution of time for an amount of use of hot water by a method wherein a temporary boiling temperature is calculated in reference to a past data of amount of use including an amount of temporary use of a specified day, an energization starting time is determined, and a boiling temperature is recalculated at a segment point in a day to define the boiling temperature. CONSTITUTION:A segment point tM in a day is defined in the midway of an energization time range of a mid night electrical power for example, at 3 A.M. An energization of a heater 12 is started from a finished time of an energization time range of a midnight electric power by a control device 20 at energization starting time (to) and (t) before or after a segment point tM of a day in such a way as predetermined boiling temperatures Tso and Ts can be accomplished at an energization finishing time (te) before a predetermined surplus time tH. When the segment time tM of a day elapses, an amount of use T1 is calculated, and a surplus temperature which is increased as a water temperature is decreased and then a boiling temperature is corrected.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides an electric water heater that uses late-night electricity.
The present invention relates to a boiling control device for an electric water heater, which enables the most appropriate boiling temperature control by setting the IH division point in the middle of the late-night electricity supply period.

Conventional electric water heaters that use late-night electricity use low power consumption by referring to past hot water usage data to determine the optimal boiling temperature, and then increasing the dl up to this boiling temperature.
; Control is performed to increase the power.

Therefore, when calculating the amount of hot water used per 111, the problem is what time to set the division point of the day, but conventionally, the time period for late-night electricity was from 11:00 p.m. to 7:00 p.m. the next morning. Since the time was set by that time, it was common to set it at 11:00 p.m. or 7:00 p.m.

The problem to be solved by the invention is that when using this prior art, the time of 23:00 is still before harvest time in a normal household, and it is fully assumed that hot water will be used after that time. Therefore, there was a problem that the division point of the day for calculating the daily usage amount was too early in terms of time, and the calculation error would be large. Furthermore, even if the division point in 11) 1 is set at 7 o'clock, it is quite possible that the hot water will be used before this time, so it is similarly difficult to obtain accurate calculation results.

Therefore, in view of the problems of the prior art, an object of the present invention is to set the division point of the day at a time in the middle of the late-night electricity supply period at which the calculation error is minimized; The usage amount for the day before the day's division point is reflected in the boiling temperature as a provisional usage amount, and at the day's division point, this is corrected and calculated to achieve the most appropriate boiling temperature control. An object of the present invention is to provide a new boiling control device for an electric water heater, which performs the following.

Means for Solving the Problems The configuration of the present invention to achieve the object includes a usage calculation storage means, a boiling temperature calculation means, and an energization start time determination means, and a power supply start time determining means for determining the power supply time of late-night power. At the dividing point of the day determined midway, the usage calculation storage means is 1
The daily usage amount is calculated and stored as usage data, the boiling temperature calculation means calculates the boiling temperature from the past usage data, and the energization start time determining means is based on the boiling temperature. While determining the time to start energizing the heater,
Before the day's division point, the usage calculation storage means:
Calculate the temporary usage amount of this L1 and boiling temperature calculation means,
The provisional boiling temperature is calculated based on this provisional usage amount and past usage data, and the energization start time determining means determines the energization start time based on the provisional boiling temperature. The gist is that energization of the heater was started.

Furthermore, a margin temperature calculation means is attached that calculates a margin temperature that increases as the water temperature decreases and outputs this margin temperature to the boiling temperature calculation means. It is also possible to add water temperature determining means for outputting to the temperature calculating means.

Therefore, when using this configuration, the usage amount for the day is undetermined before the division point of the day, but the usage 1 calculation storage means calculates the provisional usage amount for the day, The boiling temperature calculation means calculates a temporary boiling temperature from past usage data including this temporary usage amount, and based on this, the energization start time determining means determines the energization start time, It is possible to control the start of energization of the heater. On the other hand, at the division point of the day, the usage amount for the day is determined, so the usage amount calculation storage means recalculates this, and thereafter, in the same manner,
Correct calculations of boiling temperature can be made.

Therefore, even if the dividing point of the day is set in the middle of the late-night power supply period, by assuming a temporary usage amount, boiling temperature control that reflects the usage up to that day can be executed with high accuracy. Can be done.

In addition, calculations before the day's dividing point shall be repeated until the heater starts energizing. In the former case, energization is started at the energization start time based on the provisional boiling temperature, while in the latter case, energization is started at the energization start time based on the determined boiling temperature. is started. Also,
In either case, the energization of the heater ends when the determined boiling temperature is achieved, that is, when boiling is completed.

Furthermore, when determining the energization start time, the energization start time determining means determines whether the scheduled time for completion of boiling is midnight or late at night. li
By setting the time to be a predetermined time before the end of the power application period, a so-called peak shift function can be achieved.

In addition, when a margin temperature determination means is attached, a large margin temperature can be added to the boiling temperature when the water temperature is low, so it is possible to prevent an unexpected shortage of hot water, and the water temperature determination means can be installed. When installed, a water temperature that reflects the past lowest water temperature can be output to the margin temperature calculation means, so that a shortage of hot water can be reliably prevented.

It works as described above.

Example Examples will be described below with reference to the drawings.

A boiling control device (hereinafter simply referred to as a control device) 20 for an electric water heater includes a usage amount calculation storage means 22, a boiling temperature calculation means 24, and an energization start time determination means 26 (a first figure).

The electric water heater 10 includes a heater 12 installed inside a hot water storage tank 11 having a water supply pipe 11a and a hot water supply pipe 11b. A hot water supply valve] 1c is installed in the hot water supply pipe 11b, and the heater 12 is connected to the power line and AC via a switching element 14 and a timer 13 that determines the time slot for late-night power supply. A plurality of temperature sensors 15, 15, . . . are attached to the hot water storage tank 11 in the vertical direction.

Temperature signal 15a which is the output of temperature sensor 15.15...
are collectively led to the control device 20 and branched into the average temperature detection storage means 21 and the water temperature determination means 23.

The output of the average temperature detection storage means 21 is inputted to the usage amount calculation storage means 22 as the average temperature TA STB, T in the hot water storage tank 11, and the output is the temporary usage amount iL△T.
o and usage data △Ti (i=1.2...),
It is input into the boiling temperature calculation means 24. Further, the output of the water temperature determining means 23 is inputted to the boiling temperature calculating means 24 as the water temperature 'rw.

The output of the water temperature determining means 23 is simultaneously branched into the margin temperature calculating means 25 and the energization start time determining means 26, while the output of the boiling temperature calculating means 24 is input to the temporary boiling temperature ''' so and the determined boiling temperature Ts are input to the energization start time determining means 26, and its output is as follows.
The temporary energization start time [0] and the energization start time t are input to the heater control means 27. Further, the output of the margin temperature calculation means 25 is outputted to the boiling temperature calculation means 24 as the margin temperature]m.

The heater control means 27 outputs a control signal 27a to the switching element 14 to control opening and closing of the switching element 14.

The operation of the control device having such a configuration on the second day is as follows.

It is now assumed that the timer 13 determines the period during which late-night power is supplied, starting at 11:00 PM and ending at 7:00 AM, out of 24 hours a day (FIG. 2). Also, the division point tM
Are you a connoisseur of this late-night power supply? In the middle of the ti time period, 1
The time when there is a high probability that the use of the hot spring water will end and the use of the next day's hot water will not start, for example, 11:00 p.m. and 7:00 p.m.
shall be set at 3:00 a.m., which is the midpoint of the current time. Further, the heater 12 is controlled by the control device 20 to a predetermined boiling temperature Tso at a energization end time (e) that is a predetermined margin time tll before the end time of the late-night power energization time zone.
The energization start time to is before or after the division point tM of the day so that STs is achieved.

(Assume that energization is started at .

The average temperature detection means 21 of the control device 2 days is the temperature sensor 1
5. Inputs the temperature signal 15a from 15..., calculates and outputs the average temperature i'A in the hot water storage tank 11 at the present time as its output, and calculates and outputs the average temperature i'A at the division point of the day (the average temperature 1 at M). ``B'' and the average temperature ``I''Bl at the division point LM of 111 on the previous day can be stored and output, respectively.

Usage amount calculation storage means 22 and boiling temperature calculation means 24
, margin temperature calculation means 25 , and energization start time determination means 2
6 can be expressed by a series of software programs (Figure 3).

This program runs during the late-night electricity hours.
It shall operate at all times. The program stops before the division point LM of 1[1, and the program step (
1), hereinafter simply written as (1)), heater]2
Make sure that the power is not turned on (2), and then first
The amount of hot water used for '' is assumed to be calculated as the provisional usage amount △′'o (3).Here, the provisional usage amount △l'o is calculated as △To
It can be calculated by = β + Tl31-1゛A, where β is the increase in the average temperature in the hot water storage tank 11 due to the energization of the heater 12 after the dividing point tM on the 11th of the previous day, and is the temperature per unit time. Assuming the increase value as ]a, β
-Ta (te -LM). In other words, the tentative usage amount ΔTo is calculated based on the temperature conversion value based on the energy balance in the hot water storage tank 11 to estimate the usage amount for the day. .

Next, the program calculates the margin temperature Tm (4
). However, the margin temperature Tm increases as the water temperature Tw decreases, for example, '1''m =<
It shall be calculated by a − 'T”w )/b,
Here, a is the optimum force value for the water temperature used, and b is b>
It is a constant of 1.

The water temperature Tw can be determined, for example, by the program shown in FIG. First, the -time memory Two is cleared with the initial value k in program step (41) in the same figure.
), hereinafter simply written as (41)), water temperature 'I'
Read wx (42). The water temperature 'I'wx can be determined by reading the temperature signal 15a from the lowest temperature sensor 15, 15, . . . of the hot water storage tank 1.

The read water temperature 'I''WX uses the -time memory Two to take the lowest value of 1 [1, which includes the 7U power-on time zone late at night and other time zones ((4B), 44))
, Furthermore, water temperature data 'I''wi (i == 1.2・
) and the contents of the - hour memory Two, and the water temperature T.
The water temperature T W can be determined by comparing the water temperature T W with the water temperature T W by sequentially correcting it by, for example, 1° C. (45).

In other words, the determined value of water temperature used as water temperature Tw is
The most appropriate value is determined by using the lowest value of water temperature over the past number of years and by assuming that the change is unlikely to occur suddenly. -The contents of the time memory 'I'wo are
At a predetermined time, for example, at the end of the late-night power supply period, the past water temperature data is stored and updated as 'wi' ((46), (47)).

Note that the initial values in step (41) in FIG. 4 are as follows:
For example, if the water temperature is 37°C and the water temperature is T''W,
For example, if the value is 35°C or higher, it is assumed that no hot water is used at all and that the hot water temperature in the hot water storage tank 11 is simply read by the temperature sensor 15 at the bottom. It is a good idea to throw it away without remembering it.

Continued “The C1 program is a temporary boiling temperature Ts.

(Step (5) in Figure 3). Temporary boiling temperature ')'so is i'1 (i = 1.2...) to the usage amount for the past several days which is stored separately, and 'I' to the provisional usage amount.
Using the maximum value △'l'MAX with 'o, Tso=△
'I'MAX +Tw +'r''m may be used.

Next, the tentative energization start time to is, for example, to =
te -ta (Tso-'I'w), or [
It can be calculated and determined by 〇-te-ta (Tso-'I'A +e) (6). Here, ta=1
/'r''a is the time required to raise the unit temperature by energizing the heater 12, and is a constant determined by the capacity of the hot water storage tank 11 and the power capacity of the heater 12; When the difference between the average temperature 'rA and the water temperature Tw is larger than the constant value C, the latter formula is used in consideration of the safety of the − layer.

The current time is the provisional energization start time calculated as described above (if 0 has passed (7), energization of the heater 12 will start (8)), and if the current time has not elapsed, the above steps are repeated ( 7). In addition, when energization of the heater 12 is started in this way, wait until the division point tM of the day has passed ((1), (2)), and if energization of the heater 12 is not started, While repeating each calculation step (1) and (2), wait for the division point [M] to pass (step (1)).
Naishoku 7)).

When the division point of the day (M has elapsed, (1), the use of this [1 J
n△'r" l wo, △i'l = tx + /3
Calculate by +TBI-'['B d (9). However, α is the increase value of the average temperature before the division point tM of the day when the heater 12 is energized in step (8), and is α−Ta (tM −to ).

Next, following steps (4) to 6), calculate the determined margin temperature 'rm, boiling temperature Ts, and energization start time t (10) to 12)), and the heater 12 has already been energized. When it is (13), boiling is completed (16
), or due to the end of the late-night electricity supply period (1
7), energization of the heater 12 is ended (18). Heater 1
When heater 12 is not energized (13), the heater 12 is energized after waiting for the energization start time E (14) to be energized (15), and the same control is performed thereafter.

In addition, with the end of energization of the heater 12 in step (18), the above-mentioned calculation of β is performed and stored, and with the calculation of usage amount ΔTl in step (9), calculation and storage of α is performed, respectively. , Prepare for the next use 1, and the usage amount ΔT1 calculated in step (9) is the boiling temperature 'I' in steps (5) and (11).
In preparation for calculating so, 'l's, it is assumed that the usage data for the past few days is stored and updated as 'I'1 (i=1.2...).

Furthermore, since the usage data △Ti is not calculated and stored in step (9) when this system is switched to manual mode, it is difficult to calculate and store it in step (9) when manual operation is performed for a long period of time. I have to let go. Therefore, after a long period of manual operation for a predetermined number of days or more, it is preferable to use fixed data stored in the system in advance in place of the usage data Δ'I'i.

Now, if we compare FIG. 1 and FIG. 3, the usage amount calculation storage means 22 in the former corresponds to steps (3) and (9) in the latter, and hereinafter, the boiling temperature calculation means 24 corresponds to step ( 5)
, (11), step 25 of margin temperature calculation is step (4)
, (10), the energization start time determining means 26 performs step (
6) and (12), the heater control means 27 performs step (8).
), (15), and (18), respectively.

In the above explanation, it is assumed that the power-on time period for late-night electricity can be set arbitrarily other than the time period from 11:00 p.m. to 7:00 p.m. Needless to say, it can be determined arbitrarily.

Effects of the Invention As explained above, according to the present invention, the usage amount calculation storage means, the boiling temperature calculation means, and the energization start time determining means are provided, and the usage amount calculation is performed before the 10th division point. The storage means calculates the provisional usage amount for the day, the boiling temperature calculation means calculates the provisional boiling temperature using the provisional usage amount, and the energization start time determination means calculates the provisional boiling temperature. On the other hand, at the division point of the day, by recalculating these various calculations and determining the boiling temperature, the energization start time is determined based on the 11th division point. Even if it is set at an arbitrary time in the middle of the late-night power supply period, the boiling temperature can be determined with sufficient accuracy, and therefore, the temperature can be determined to This has an extremely excellent effect of being able to realize boiling temperature control that suits the needs of the user.

In addition, by adding a margin temperature calculation means that calculates a margin temperature that increases as the water temperature decreases, and by determining the water temperature from water temperature data that stores past lowest water temperatures, it is possible to set a predetermined temperature when determining the boiling temperature. This has the excellent effect of preventing the occurrence of hot water shortages and reducing power consumption to the minimum necessary.

[Brief explanation of the drawing]

1 to 4 show an embodiment, in which FIG. 1 is an overall schematic block system diagram, FIG. 2 is an operation explanatory diagram, and FIGS. 3 and 4 are program flowcharts. [M...Division point L of the day...Electrification start time (0...Temporary energization start time Ts...Boiling temperature Tso...Temporary boiling temperature Δ'I゛0... - Temporary usage amount △'I'i... Usage amount data 'Fw... Water temperature Tm... Margin temperature 10... Electric water heater 12... Heater 20... Boiling control device 22. ... Usage amount calculation storage means 23 ... Water temperature determination means 24 ... Boiling temperature calculation means 25 ... Surplus temperature calculation means 26 ... Current supply start time determination means

Claims (1)

[Scope of Claims] 1) Usage amount calculation storage means that calculates the daily usage amount at each division point of the day determined in the middle of the late-night electricity supply period and stores it as usage data; A boiling temperature calculating means for calculating a boiling temperature from the past usage data, and an energization start time determining means for determining a energization start time of the heater based on the boiling temperature, and a dividing point of the day. Previously, the usage calculation storage means calculated a provisional usage amount for the current day, and the boiling temperature calculation means calculated a provisional boiling temperature from the provisional usage amount and the past usage data. and the energization start time determining means determines the energization start time based on the provisional boiling temperature, and starts energizing the heater at the energization start time. Boiling control device for electric water heaters. 2) The usage amount calculation storage means calculates the usage amount as a temperature conversion value.
A boiling control device for an electric water heater as described in . 3) A margin temperature calculation means is provided, and the margin temperature calculation means calculates a margin temperature that increases as the water temperature decreases, and outputs the calculated margin temperature to the boiling temperature calculation means. A boiling control device for an electric water heater as described in . 4) A water temperature determining means is provided, and the water temperature determining means stores the lowest water temperature of the day as water temperature data, determines the water temperature based on the past water temperature data, and outputs the determined water temperature to the margin temperature calculation means. A boiling control device for an electric water heater as claimed in claim 3. 5) The boiling temperature calculating means uses fixed data instead of the usage data after manual operation for a predetermined number of days or more. A boiling control device for an electric water heater according to any one of the above.