JPH0448150A - Electrical water heater - Google Patents

Abstract

PURPOSE:To perform a continuous additional-boilding operation at a daytime period at a temperature lower than a normal boiling-up temperature and eliminate a lack of hot water by a method wherein current application to a heater is controller in such a way that a temperature setting signal from a temperature varying setting means in daytime or nighttime be equal to a sensing temperature from a temperature sensing means. CONSTITUTION:During a daytime period, 7 o'clock to 22 o'clock, a mid-night time sensing means 8 outputs a signal indicating that the time is in a daytime range. A temperature varying setting means 7 for a daytime or a nighttime inputs a signal indicating that the time is in a daytime range. When it is set by the daytime additional-boiling setting means 9 that the daytime additional boiling is carried out, it outputs temperature lower than a temperature set by a user, for example, a temperature of 47 deg.C setting signal. A heater control means 6 is operated to perform an electrical energization for the heater 4 in the event that the detected temperature from the temperature sensor 5 is lower than the set temperature. Accordingly, in this case, when the hot water of 85 deg.C set by a midnight electrical power is taken out from a hot water feeding pipe 3 and used, the water supplemented from the water supplying pipe 2 is heated up to 47 deg.C from the water supplying pipe 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric water heater of a hot water storage type that utilizes late-night power and daytime power.

2. Description of the Related Art As shown in FIG. 2, a conventional electric water heater of this type has a heater 4 installed inside a hot water storage tank 1 with a water supply pipe 2 connected to the lower part and a hot water outlet pipe 3 connected to the upper part. A temperature sensor 5 is installed as a temperature detection means. The heater control means 6 is
The power supply to the heater 4 is controlled so that there is no difference between the temperature detected by the temperature sensor 5 and the temperature set by the temperature setting means 10. Further, as t'a, power is supplied which is cheaper in the middle of the night than in the daytime, and the late-night timer 13 supplies power to the heater control means 6 only during the late-night hours, such as from 11:00 p.m. to 7:00 p.m. The temperature setting means 10 sets the temperature of the hot water inside the hot water storage tank 1 to a set temperature during the late night hours when the price is low. On the other hand, during the daytime hours other than the midnight hours, the daytime timer 12 energizes the hot water for a time corresponding to the amount of reheating set by the daytime reheating amount setting means 11, and the amount of hot water heated during the late night energization is insufficient. It is now possible to use electricity during the day to replenish a certain amount of electricity. The user can secure the required amount of stored hot water by changing the setting of the amount of hot water to be chased using the daytime hot water amount setting means 11 every time there is a change in the amount of hot water to be chased.

Problems to be Solved by the Invention However, in the conventional configuration as described above, the amount of reheating is fixed, so if the amount of reheating that is normally used is not enough due to an unexpected visitor, the user can suddenly Even if I changed the setting for the amount of reheating, the hot water could not be reheated in time and the hot water would run out. In addition, if you set a large amount of water to be heated during the day to avoid this, most of the water will be boiled by daytime electricity, which is more expensive than late at night, which is uneconomical, and you will have to store hot water for a long time. As a result, heat radiation loss from the surface of the hot water storage tank cannot be ignored, which also poses problems such as being uneconomical.

The present invention solves the above-mentioned problems and provides an electric water heater that does not have to worry about running out of hot water by continuously performing reheating during the daytime at a temperature lower than the normal boiling temperature. The purpose is to make offerings.

Means for Solving the Problems In order to solve the above problems, the present invention provides a heater provided in a hot water storage tank, a temperature detection means for detecting the temperature inside the hot water storage tank, and an open signal that is set during the midnight electrode time. When there is a signal from the midnight time detection means, the temperature setting signal set by the user is output, and when there is no signal from the midnight time detection means, the temperature setting signal is output, and when there is no signal from the midnight time detection means, the temperature setting signal is detected. day/night temperature change setting means that outputs a lower temperature setting signal than when there is a signal from the means; It is constituted by a heater control means that controls the supply of electricity to the heater.

Operation With the above configuration, reheating during the daytime is performed continuously at a temperature lower than the boiling temperature of late-night electricity, so there is no fear of running out of hot water even if there is a sudden increase in usage, and it is economical.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, a heater 4 is installed inside a hot water storage tank 1 with a hot water supply pipe 2 connected to the lower part and a hot water outlet pipe 3 connected to the upper part. 5 is provided. The heater 4 and the temperature sensor 5 are connected to a heater control means 6, and the heater control means 6 includes a late-night time zone detection means 8 that outputs a signal indicating whether or not it is a late-night time zone, and a late-night time zone detection means 8 that outputs a signal indicating whether or not it is a late-night time zone. A temperature setting signal is input from the day/night temperature change setting means 7 connected to the daytime chasing setting means 9, which is set to determine whether or not to perform the following. At t8, power is supplied at a lower rate during the late night hours than during the daytime hours.

The user sets, for example, 85°C as the temperature of water that he wants to boil in the late night hours in the day/night temperature change setting means 7. This set temperature stores a large amount of heat during the late night hours when the charges are low. For this purpose, the temperature is set at a relatively high temperature, such as 85°C.

When actually supplying hot water to washrooms, kitchens, baths, etc., this hot water is mixed with water and used at around 40°C. Also, at the same time, the daytime chasing setting means 9 is used to set whether or not to perform daytime chasing. This is because, for example, in the summer when the amount of hot water used is small,
It is used for the purpose of increasing economic efficiency by suppressing reheating during the day when there is surplus water heated using electricity late at night, and is set to reheat at other times.

Currently, in a late night time zone, such as from 11:00 PM to 7:00 AM the next day, the late night time zone detection means 8 is outputting a signal indicating that it is a late night time zone. When the day/night temperature change setting means 7 receives this signal, it outputs a set temperature signal of, for example, 85° C., which is preset by the user. The heater control means 6 inputs this set temperature signal and the detected temperature signal from the temperature sensor 5, and if the detected temperature is lower than the set temperature, it energizes the heater 4. Therefore, in this case, at 7 o'clock, the hot water tank l The interior will be filled with hot water at 85°C.

Next, during the daytime period, in this case from 7:00 to 22:00, the late night time period detection means 8 outputs a signal indicating that it is the daytime period. The day/night temperature change setting means 7 is set by the user when a signal indicating that it is daytime is input and the daytime reheating setting means 11 is set to perform reheating during the day. A temperature setting signal of a temperature lower than the temperature, for example, 47° C. is output. The heater control means 6 acts to energize the heater 4 when the detected temperature from the temperature sensor 5 is lower than this set temperature. Therefore, in this case, if hot water, which is 85°C due to late-night electricity, is taken out from the hot water tap 3 and used, the water supplied from the water supply pipe 2 will be warmed to 47°C and accumulate. Furthermore, even if all the hot water at 85°C due to late-night electricity is used up, hot water storage tank 1 will be filled with hot water at 47°C, and will continue to be refilled at 47°C during the daytime hours. 2. There is no need to worry about running out of hot water even when the amount of hot water used increases.Furthermore, since it performs continuous reheating, a timer is required to limit the reheating time during the day. This is very advantageous for reducing costs. In addition, since heating during the day is carried out at a low temperature, there is less loss due to heat radiation from the surface of the hot water storage tank, making it economical. During late night hours, it is only necessary to further raise the temperature of the hot water that has reached a certain temperature, so a smaller capacity heater can be used, which not only contributes to reducing equipment costs, but also reduces the heater capacity. It is economical because the basic contract fee can be lowered. In addition, even when the temperature is extremely low during winter and the supplied water temperature is too low to reach the set temperature using electricity alone late at night, you can raise the overall temperature of the hot water in the hot water tank during the day. It can be heated to a boil.

In addition, in this embodiment, an example was shown in which there is one IS system with different charges for late-night hours and daytime hours, but the present invention can also be applied when electricity is supplied divided into two systems: daytime power and late-night power. Of course it can be applied.

Effects of the Invention As is clear from the above explanation, the present invention has the following effects.

(]) Since the hot water is continuously reheated throughout the day, there is no water in the hot water storage tank, so there is no need to worry about running out of hot water even when usage increases.

(2) Since reheating is performed continuously, there is no need for a timer to limit the retrieval time during the day, which is very advantageous for reducing equipment costs.

(3) Since the daytime reheating is carried out at a low temperature, there is less loss due to heat radiation from the surface of the hot water storage tank, making it economical.

(4) During late night hours, it is only necessary to further raise the temperature once the temperature has reached a certain level, so a smaller capacity heater can be used, which of course contributes to reducing equipment costs. It is economical because the basic power contract charge, which is determined by the heater capacity, can be lowered.

(5) Even when the temperature is extremely low in winter and the supplied water temperature is too low to reach the set temperature using electricity alone in the middle of the night, the entire temperature of the hot water in the hot water tank can be raised during the day. It can be heated to a set temperature.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electric water heater showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional electric water heater. 1...Hot water tank, 4...Heater, 5...
... Temperature sensor, 6... Heater control means,
7... Day and night temperature change setting means, 8...
・Late-night time zone detection means, 9... Daytime reheating setting means.

Claims (1)

[Claims] A heater provided in a hot water storage tank, a temperature detection means for detecting the temperature inside the hot water storage tank, a late night time period detection means for outputting a signal indicating whether or not it is a late night power period, and a late night time period detection means. When a signal indicating that it is a late night time zone is inputted, a temperature setting signal set by the user is outputted, and when a signal indicating that it is not a late night time zone is inputted from the late night time zone detecting means, the temperature setting signal is outputted. day/night temperature change setting means for outputting a temperature setting signal lower than when a signal indicating that it is a late night time zone is inputted from the time zone detection means; a temperature setting signal from the day/night temperature change setting means; An electric water heater comprising heater control means for controlling energization of the heater so that the temperature detected by the temperature detection means is equal to the temperature detected by the temperature detection means.