JPS618546A - Electric hot water supplier - Google Patents

Abstract

PURPOSE:To provide a mean load at mid-night electric load and make a high efficient operation of electrical system by a method wherein more than two kinds of electric loads are arranged and they are controlled in compliance with their unique characteristics. CONSTITUTION:The heating of the water in a hot water storing tank 2 is performed by a heat pump unit 4 and a heater 3. In the summer season having a high surrounding air temperature, only the heat pump unit 4 is operated at A, and in an inter-season the heating of water by the unit 4 is mainly performed and a lack amount of calorie is calculated by a control unit 10, a relay RY1 is operated at the midway of heating condition to perform a simultaneous heating at B with the heater 3 is performed. In the winter season, the operation is the same as that in inter-season, further a parallel energization of the unit with the heater 3 is elongated for its duration time. The heater 3 is set to have a capacity capable of sufficiently increasing of heating water within a desired mid-night electric power energization time even in a severe cold season. In this way, the heat pump unit 4 having a low capacity of electric power is applied as a base unit and the heater 3 is properly and auxiliary energized, thereby it becomes possible to make an economic heating operation. Main application of operation with a relative low electric power capacity enables a uniform loading in a mid-night power energization time to be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for effectively configuring two or more types of loads (for example, a heater and a heat pump) to boil water more economically in accordance with late-night power situations. , relates to a water heater for home use that uses electricity late at night.

Two conventional configurations and one problem As shown in FIG. The capacity of the heater 3 is also set so that the leg lifting is completed.

Therefore, - Looking at the whole year, the water temperature is high in summer and the amount of hot water used is low. Looking at the electricity usage statistics, it is about half of the amount used in winter.

For example, if electricity is turned on for 8 hours late at night, approximately 6 to 8 hours in winter.
It takes 4 to 6 hours during the spring and fall seasons, and 3 to 4 hours during the summer to complete the leg raise.

Therefore, especially in the summer, the peak load is concentrated in the first 3 to 4 hours after electricity is turned on, and the remaining 4 to 5 hours are completely unused, resulting in an unbalanced usage situation, which lacks the effective use of late-night electricity. was.

In addition, from the standpoint of the equipment's efficiency, it is uneconomical to complete the leg installation early in the night, causing loss due to natural heat dissipation over a long period of time at night.

OBJECTS OF THE INVENTION An object of the present invention is to provide a highly efficient water heater that effectively combines two or more types of loads with different characteristics to effectively utilize late-night power in accordance with the actual situation.

Structure of the Invention In order to achieve this object, the present invention provides two or more types of power loads and controls them according to the specificity of each type, thereby achieving load leveling and high efficiency in the middle of the night.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2, 3, and 4.

In FIG. 2, 1 is a hot water storage type water heater, and 4 is a heat pump unit. The space between them is connected by refrigerant piping to transfer latent heat.

The hot water storage type water heater 1 is provided with a heat exchanger 12 for refrigerant and water, a hot water storage tank 2, and a heater 3 carried into the hot water storage tank 2. Boiling of water in the hot water storage tank 2 is performed by a heat pump unit 4 and a heater 3.

The boiling mechanism using a heat pump is that the refrigerant is depressurized by an expansion valve 8 provided in a heat pump unit 4, is evaporated in an evaporator 6 while absorbing atmospheric heat sent by a fan 7, and is introduced to a compressor 5. The resulting gas becomes a high-pressure gas and is guided to a heat exchanger 12 built into the water heater 1 via a refrigerant pipe 11.

In this, the high-temperature, high-pressure refrigerant exchanges heat with water introduced from the lower part of the tank by the circulation pump 13, and the boiled water is stored in the upper part of the tank.

The heating capacity of the heat pump unit 4 has a strong correlation with the outside air temperature, and when the outside air temperature is high, the heating efficiency can be more than three times that of the heater 3.

For this reason, the outside temperature is detected by the outside temperature sensor 9, the control unit 10 provided on the water heater 1 side calculates the leg capacity, and it is determined whether or not boiling is possible using only the heat pump.

As shown in FIG. 4a, during the summer season when the outside temperature is high, only the heat pump unit 4 is operated A, and during the intermediate period, as shown in b, boiling is mainly performed by the heat pump unit 4, but the insufficient amount of heat is handled by the control unit 10. During the calculation and discharge, relay RY1 is activated to perform simultaneous discharge B with heater 3.

In the winter season, as shown in C, the period of parallel energization with the heater 3 is longer, although it is similar to the intermediate season.

The capacity setting for each load is determined by the heat pump unit 4.
The standard for setting the capacity is that most of the stored hot water capacity can be boiled during the summer to mid-season, when the water efficiency is high.

Furthermore, the heater 3 needs to be set in a capacity that is sufficient to discharge heat within a predetermined late-night power supply time even in the cold season when the capacity of the heat pump is extremely reduced.

A typical capacity for household use is 3701, and the heater capacity at this time is 4.4 kW. A heat pump capacity of about 1.4 kW is sufficient for intermediate boiling.

In this way, by using the heat pump unit 4, which has a small power capacity as a base, and appropriately energizing the heater 3, which has a large power capacity, as an auxiliary power supply, economical boiling can be achieved by using a heat pump. Furthermore, by mainly using operation with a relatively small power capacity, the load can be leveled during the late-night power supply time period.

Regarding the heater 3, which is energized when necessary, by delaying the energization start time, the power load can be reduced the most.
Since there is a high probability that power will be turned on in the middle of the night, it will not be a major problem, unlike the peak that occurs at the same time as when power is turned on.

Effects of the Invention As described above, the electric water heater of the present invention provides the following effects.

(1) It is composed of two types of power loads, and can be turned on at the same time when power is started, so that the power loads can be leveled.

(Shun) The effect of this method is greatest through the combination of electric loads such as heat pumps and heaters.Based on highly efficient heat pump operation, economic efficiency is improved, and by backing up the heater, the amount of hot water in winter can be guaranteed.

(3) The boiling capacity of the heat pump is predicted in advance based on the outside temperature, and as a result, it is determined whether or not to energize the heater, and the time to start energizing is determined. Cooperative operation of loads is possible.

In addition, the heater can be turned on at midnight to make effective use of the time when it is most likely to generate electricity.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a conventional example, Fig. 2 is a schematic diagram showing an embodiment of the present invention, Fig. 3 is an electrical circuit diagram of the same, and Fig. 4 is a power load pattern assuming the same seasonal operating state. It is a diagram. 1... Water heater using late night electricity, 3... Heater, 4... Heat pump unit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 1?

Claims (2)

[Claims] (1) An electric water heater that is composed of two or more types of electric power loads and that arbitrarily controls the start time of energization of a load with a large capacity among them. (2) The electric water heater according to claim 1, wherein the start time of energization of a large-capacity load is controlled by outside temperature.