JPS5875656A - Hot water storage type electric water heater - Google Patents

Abstract

PURPOSE:To average power supply hours by a system wherein the required electric energy with respect to the hot water quantity intended to be used the following day is calculated by detecting feed water temperature. CONSTITUTION:An arithmetic unit 6 calculates the capacity of heating element necessary for heating-up the hot water quantity intended to be used the following day within the range midnight power supply time based upon the inputted value of the hot water quantity intended to be used the following day to a hot water quantity setting means 4 and the detected value of a feed water temperature sensor 5 just before or after the start of power supply. In addition, a power controlling means 7 controls for the capacity of heating element to have the predetermined capacity obtained by the arithmetic unit 6. Owing to the configuration as described above, the power load can be averaged and the transmission efficiency improved and, further, various radiation losses are contrived to reduce.

Description

[Detailed description of the invention] The present invention relates to a hot water storage type electric water heater.

Set the appropriate heating element capacity based on the amount of hot water used and the water supply temperature,
Figure 1 shows the main electrical circuit of a conventional hot water storage type electric water heater, which always attempts to boil water in a fixed amount of time. In the figure, 1 is a power source, 2 is a heating element, and 3 is an automatic temperature controller.

Next, we will explain the function and operation of the conventional circuit by taking as an example the case where late-night electricity is used, which is generally done. The heating element 2 generates 850 ℃ of water at around 8℃, which corresponds to the water temperature in winter, during the energization time.
As if to boil.

The heating element capacity is set. Also, automatic source lfi,
The 11 node 3 has a normally closed contact, and is configured to open the contact and stop energizing the 9 heating element 2 when the water in the hot water storage tank reaches 85°C.

The hot water tank is filled with 85℃ hot water every morning, but the amount of hot water used is not always the same.

It varies from day to day and largely from season to season. In particular, whether or not a person takes a bath is a factor that greatly influences the amount of hot water used, and on days when a person does not take a bath, more than half of the stored hot water may remain.

Therefore, in such a case, when the midnight energization time comes, the energization starts all at once, and the water boils down in a short time. For this reason,
The present invention attempts to eliminate these drawbacks, as it has not been possible to equalize the power load, which is the original purpose of late-night power (concentration of power load), and has resulted in poor power transmission efficiency. The required amount of power t is calculated based on the set amount of hot water to be used on the next day, taking into consideration the temperature of the water supply, and the system attempts to boil the required amount of power at a constant power level using the entire late-night power supply time.

The following two aspects of the present invention will be explained based on the current carrying capacity control block diagram shown in FIG. In FIG. 2, reference numeral 4 denotes a hot water amount setting means for presetting the amount of hot water to be used on the next day stored in the hot water storage tank, 5 a water supply water temperature sensor for detecting the temperature of the water supplied into the hot water storage tank, and 6 the hot water amount setting means. This is a calculator that calculates the heating element capacity required to boil the water in a predetermined time based on the set value set in step 4 and the feed water temperature detected by the feed water temperature sensor.T is the predetermined heating element calculated by this calculator 6. This is power control means that performs control so that capacity is added.

Next, to explain an example of its operation using symbols and formulas, let us assume that the input value of the next day's amount of hot water set in advance by the hot water amount setting means 4 is v liters (hot water temperature T°C). When the detected value of is t'o, the calculator 6 performs the calculation of the heating element capacity m (kW) required for boiling in 8 hours of late-night electricity supply (I DI = 860&j). Then, the power control means 7 calculates the heating element capacity by the predetermined capacity m(
kW).

In the above embodiment, the case of using late-night power has been described, but the same effect can be obtained even if a timer mechanism is provided for inputting the desired boiling time for general power.

As described above, the device according to the present invention detects the water supply temperature for the preset amount of hot water used the next day, calculates the required amount of electricity, averages this over the energization time frame, energizes, and Since it is configured so that only the amount of calories corresponding to the amount of hot water is applied, it is possible to equalize the power load and improve power transmission efficiency. In addition, the amount of remaining hot water each day decreases, and 8.
Since hot water is often stored at temperatures below 5°C, it has the effect of reducing various heat radiation losses and lowering maintenance costs.

[Brief explanation of drawings]

FIG. 1 is a main electrical circuit diagram of a conventional hot water storage type water heater, and FIG. 2 is a block diagram of current capacity control according to the present invention. 4 is a hot water amount setting means, and 5 is a water supply water temperature sensor. 6 is a computing unit, and 7 is a power control means. Agent Shin Kuzuno - (1 other person) 4P l Figure 4 5

Claims (1)

[Claims] A hot water amount setting means for presetting the amount of hot water used to be stored in the hot water storage tank, a water supply water temperature sensor for detecting the temperature of water supplied to the hot water storage tank, and a set value set by the hot water amount setting means and a temperature detected by the water supply water temperature sensor. A hot water storage type equipped with a calculator that calculates the heating element capacity required to boil the water in a predetermined time based on the water supply temperature, and a power control means that controls so that the heating element capacity calculated by the calculator is added. Electric water heater.