JPH0828964A - Hot water supply equipment - Google Patents

Abstract

PURPOSE:To reduce electrical rates for a unit volume of hot water by a method wherein the hot water having a temperature of a boiling point of water or below is obtained by a solid heat storage device by using a midnight power and then this hot water is heated quickly and efficiently by an electric heater by using a normal power so that hot water to drink be obtained. CONSTITUTION:A power supply device 11 being controlled by a control device 10, a midnight power is supplied to an electric heater 7 of a heat storage device 1 and thereby a solid heat storage body 5 is heated so that heat storage be executed. A blower fan 8 being controlled by the control device 10 in the daytime, air is circulated by a circulating air passage 9 and heated by the solid heat storage body 5 so as to be made warm air. Moreover, water is supplied to a passage 16A for heat exchange from a water supply pipe 17 and made to flow through a heat exchanger 12 by driving a pump 18 and thereby it is subjected to heat exchange with the warm air in the circulating air passage 9 so as to be made hot water. The hot water is supplied to a first hot water storage tank 15 from a passage 16B for heat exchange. By driving a pump 21 connected to a circulation passage 20 for supplying hot water to drink, on the other hand, the hot water in the first hot water storage tank 15 is supplied to a second hot water storage tank 22 through a hot water supply pipe 23 and a hot water supply valve 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device used for supplying hot water for drinking.

[0002]

2. Description of the Related Art For example, in an office building, there is an electric water heater as a hot water supply device provided for supplying hot water to a hot water supply room at a plurality of places. This electric water heater
An electric heater is provided inside the hot water storage tank, the water supplied to the hot water storage tank is heated to the boiling point by the electric heater and stored as hot water, and the stored hot water is discharged from the water tap connected to the hot water storage tank. . Hot water for drinking is usually used in the daytime in office buildings and the like. For this reason, the electric water heater secures the water by heating the water with an electric heater at regular intervals in the daytime by using regular electric power at appropriate intervals.

[0003]

As described above, in the conventional electric water heater used for supplying hot water for drinking, since expensive electric power for daytime is used for all electric power used for heating water, the unit of hot water is There is a problem that the electricity charge per volume is high and the economy is poor.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hot water supply apparatus used for supplying hot water for drinks, which has a low electric charge per unit volume of hot water and is excellent in economic efficiency.

[0005]

In order to achieve the above object, a hot water supply apparatus of the present invention is a heat storage device for heating a solid heat storage body by an electric heater to store the heat, and the solid heat storage body of the heat storage device discharges the heat. Heat exchanger for heating water by heat, hot water temperature adjusting mechanism for adjusting the temperature of water heated by the heat exchanger to the boiling point of water or less, and hot water obtained by heating water by the heat exchanger. A first hot water storage tank for storing, and a second hot water storage tank to which a hot water tap for connecting the hot water supplied from the first hot water storage tank and discharging the hot water to the outside is connected,
An electric heater that heats the hot water stored in the second hot water storage tank to make the temperature of the hot water the boiling point is provided, and the heat storage device supplies electric power to the electric heater at midnight to heat the solid heat storage body. However, the second hot water storage tank is characterized in that the electric heater is supplied with regular power to heat the hot water.

[0006]

The heat storage device energizes the electric heater by using the electric power at midnight at night to heat the solid heat storage body to store heat. The heat exchanger heats water by using the heat released from the solid heat storage body of the heat storage device during the daytime. The temperature of the water heated by the heat exchanger is adjusted to be below the boiling point of water by the hot water temperature control mechanism. The first hot water storage tank stores the hot water obtained by heating the water with a heat exchanger. Second
The hot water is stored by receiving the hot water supplied from the first hot water storage tank. The electric heater is energized in the daytime by using regular electric power, and the hot water stored in the second hot water storage tank has a boiling point, that is, 10
Heat to a temperature of 0 ° C. The hot water of 100 ° C stored in the second hot water storage tank is taken out from the hot water tap and used.

As described above, hot water of about 80 ° C. is obtained by the solid-state heat storage device by using the late-night electric power whose electric charge is low. Next, this hot water is rapidly and efficiently heated to 100 ° C., which is required as hot water for beverages, by an electric heater using regular electric power to obtain hot water for drinking. Therefore, the electricity charge per unit volume of hot water is low, and the economical efficiency of the hot water supply device used for supplying hot water for beverage can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In FIG. 1, 1 is a heat storage device. The heat storage device 1 includes a main body 2 made of a heat insulating material partitioned into a heat storage chamber 3 and a heat radiation chamber 4, a solid heat storage body 5 provided in the heat storage chamber 3 of the main body 2 and having a plurality of ventilation holes 6, Heat storage body 5
Electric heaters (sheath heaters) installed inside the
7, a blower fan 8 provided in the heat dissipation chamber 4 of the main body 2 is provided. The main body 2 is provided with a heat storage chamber 3, a ventilation hole 6 of the solid heat storage body 5, and a circulation air passage 9 connecting the heat radiation chamber 4.
The blower fan 8 is connected to the control circuit 10, and the electric heater 7
Is connected to the power supply circuit 11. The control circuit 10 controls energization and interruption of the power supply circuit 11.

The electric heater 7 heats the solid regenerator 5 by being energized and generating heat under the control of the control circuit 10. The solid heat storage body 5 is heated by the electric heater 7 and stores heat. The blower fan 8 is rotationally driven by the control of the control circuit 10 to circulate the air in the circulating air passage 9. The air that circulates and circulates in the circulation air passage 9 is heated by the heat released by the solid heat storage body 5 when passing through the ventilation holes 6 of the solid heat storage body 5 to become warm air.

Reference numeral 12 in the drawing is a heat exchanger, which is a combination of a pipe 13 for circulating water and a fin 14 for heat transfer. The heat exchanger 12 is provided in the heat dissipation chamber 4 of the main body 2 of the heat storage device 1, is heated by the solid heat storage body 5, and is circulated in the circulation air passage 9
Heat is exchanged between the air flowing through and the water flowing through the pipe 12 to heat the water.

Reference numeral 15 in the drawing denotes a first hot water storage tank for hot water supply for beverages. The first hot water storage tank 15 and the pipe 12 of the heat exchanger 11 are connected by a heat exchange passage 16A and a heat exchange passage 16B. A water supply pipe 17 connected to a water supply source (not shown), for example, water supply, is connected to the heat exchange passage 16A, and a pump 18 is provided so as to intervene. A thermometer 19 is provided in the other passage of the circulation passage 15 to measure the temperature of the water (hot water) heated by the heat exchanger 11.

Reference numeral 20 in the drawing denotes a beverage hot water circulation passage connected to the first hot water storage tank 15, and a pump 21 is provided in this circulation passage. In the drawing, 22 is a second hot water storage tank for hot water supply for beverages,
This is installed in multiple places such as the hot water supply room of the building. In this second hot water storage tank 22, a hot water supply pipe 23 connected to the circulation passage 20, a ball tap type hot water supply valve 24 provided in the hot water supply pipe 23, an electric heater 25, a hot water supply tap 26, a drain pipe 27 and this drain pipe. A drainage valve 28 connected to 27 is provided.

The ball tap type hot water supply valve 24 is provided with a float body 24a which floats on the surface of the hot water stored in the second hot water storage tank and moves up and down according to the fluctuation of the water level. The float body 24a moves up and down. That is, it opens and closes according to the fluctuation of the water level of the hot water. The electric heater 25 is connected to a power supply device 29, and the power supply device 29 is connected to the control device 3
Controlled by 0.

The second hot water storage tank 20 is used to store hot water for beverages, and the stored hot water is heated by the electric heater 2.
5, the hot water is heated to the temperature required for hot water supply, that is, 100 ° C.

In this embodiment, a structure corresponding to an electric water heater for hot water for hand washing is added. That is, reference numeral 41 in the drawing denotes a hot water storage tank for hand-washing hot water, and this hot water storage tank 41 has a heat exchange passage 42 connected to the heat exchange passage 16B.
A and the heat exchange passage 4 connected to the heat exchange passage 16A
2B is connected. The passage 42A for heat exchange has an on-off valve 4
3 is interposed, the hot water storage tank 41 is provided with a thermometer 44 for measuring the temperature of the hot water stored therein, and the output of the thermometer 44 is output to the control device 45. The control device 45 controls opening / closing of the opening / closing valve 43.

The hot water storage tank 41 is connected to a hot water supply circulation passage 46 having a pump 47 for hand washing hot water supply. To this hot water supply circulation passage 46, hot water supply plugs (including mixing taps) 48 provided at a plurality of places such as each washroom in a building are connected. To the hot water storage tank 41, a water supply pipe 49 connected to a water supply source (not shown) such as a water supply is connected.

The hot water supply for beverages in the hot water supply apparatus thus configured will be described. First, in the heat storage device 1,
The control device 10 controls the power supply device 11 to energize the electric heater 7 using midnight power to heat the solid regenerator 5 at midnight to store heat.

Under the control of the control circuit 10, the blower fan 8 is rotationally driven in the daytime to circulate and circulate the air in the circulation air passage 9, and this air is heated by the heat released by the solid heat storage body 5 to become warm air. Further, water is supplied from the water supply source to the heat exchange passage 16A through the water supply pipe 17, and the pump 1
8 is driven to rotate so that water flows into the heat exchanger 12. The water exchanges heat with the hot air flowing through the circulation air passage 9 of the heat storage device 1 in the heat exchanger 12 and is heated to become hot water. The hot water heated here is sent to the first hot water storage tank 15 from the heat exchange passage 16B. In this way, the temperature of the water rises in the process of circulating the water between the heat exchanger 12 and the first hot water storage tank 15. Then, it is heated to a temperature below the boiling point of water, for example 80 ° C., and stored in the first hot water storage tank 15. Water temperature is 80 ℃
When it reaches, the rotation drive of the blower fan 8 is stopped by the control of the control circuit 10.

Further, the pump 21 connected to the beverage hot water circulation passage 20 is rotationally driven to circulate the hot water having a temperature of 80 ° C. stored in the first hot water storage tank 15 through the beverage hot water circulation passage 20. In each second hot water storage tank 22 connected to the beverage hot water circulation passage 20, since no hot water is initially stored inside, the float body 24a of the ball tap hot water supply valve 24 is provided.
By this operation, the hot water supply valve 23 is opened, and hot water flows from the circulation passage 20 into the second hot water storage tank 22 via the hot water supply pipe 23 and the hot water supply valve 24. When hot water is accumulated in the second hot water tank 22 up to a predetermined water level, the operation of the float body 24a causes the hot water supply valve 2 to operate.
3 is closed and the supply of hot water from the circulation passage 20 is stopped.

In each of the second hot water storage tanks 22, the control device 3 is used during the daytime.
With the control of 0, the power supply device 29 energizes the electric heater 25 by using the regular electric power, and the electric heater 25 heats the hot water having the temperature of 80 ° C. stored in the second hot water tank 22 to the boiling point of 100 ° C. Then, the hot water taps 26 provided in each of the second hot water storage tanks 22 are opened and the temperature of 100 ° C. stored in the second hot water storage tank 22 is increased.
Use the hot water outside as a beverage. When the water level of the hot water stored in the second hot water storage tank 22 decreases due to the consumption of hot water, the operation of the float body 24 of the ball tap type hot water supply valve 24 opens the hot water supply valve 24 and the hot water is circulated from the circulation passage 20 to the second position.
Is supplied to the hot water storage tank 22. When the hot water stored in the second hot water storage tank 22 reaches a predetermined water level, the hot water supply valve 24 stops the hot water supply. The drain in each of the second hot water storage tanks 22 is discharged through the drain pipe 27 by opening the drain valve 28.

The supply of water to the first hot water storage tank 15 is appropriately performed by the water supply pipe 17 according to the consumption of hot water in the second hot water storage tank 22. The heating of the hot water in the second hot water storage tank 22 is appropriately performed according to the consumption of the hot water in the second hot water storage tank 22.

As described above, in the hot water supply device of the present invention, the heat storage device 1 obtains hot water at a temperature lower than the boiling point of water, for example, about 80 ° C., by using the late-night electric power which is inexpensive for electricity. Then, the boiling point of this hot water, which is required for hot water for drinking, is 100 ° C. rapidly and efficiently by using the electric heater 25 by using ordinary power.
Heat to obtain hot water for drinking. Therefore, the electricity charge per unit volume of hot water is low, and the economical efficiency of the hot water supply device used for supplying hot water for beverage can be improved.

Next, the hot water supply for hand washing will be described. It is said that the proper temperature for hand-washing water is 60 ° C.
We shall obtain 0 ° C hot water. The valve 43 provided in the heat exchange passage 42A is opened in advance by the control of the control device 45. When water is supplied from the water supply pipe 49 to the hot water storage tank 41, this water is sent from the passage 42B to the heat exchange passage 16A and flows together with the hot water flowing between the heat exchanger 12 and the first hot water storage tank 15. And heat exchange passage 16B that is heated by the heat exchanger 12
Flowing through. Then, 1 of the hot water flowing through the heat exchange passage 16B
The portion flows into the hot water storage tank 41 through the heat exchange passage 16A.

By circulating the hot water between the heat exchanger 12 and the hot water storage tank 41 in this manner, the temperature of the hot water is gradually raised and stored in the hot water storage tank 41. When the temperature of the hot water storage tank 41 reaches 60 ° C., the thermometer 44 detects this temperature and sends a signal to the control device 45. The control device 45 receives this signal and closes the valve 43. As a result, the flow of water between the heat exchanger 12 and the hot water storage tank 41 is stopped.

The pump 47 provided in the circulation passage 46 is driven to rotate so that the hot water stored in the hot water storage tank 41 is circulated in the circulation passage 4
Cycle at 6. Then, by opening each hot water supply plug 48 connected to the circulation passage 46, hot water having a temperature of 60 ° C. can be discharged outside and mixed with water to be used for hand washing and the like.

Also in this hot water supply for hand washing, as in the case of the hot water supply for beverages mentioned above, the late-night electric power is used by the heat storage device 1 and the heat exchanger 12 so that the electricity charge per unit volume of hot water is low. You can get hot water. In addition,
The present invention is not limited to the above-described embodiments and can be modified in various ways.

[0027]

As described above, according to the hot water supply device of the present invention, by using the late-night electric power, which has a low electricity rate, a solid heat storage device is used to obtain hot water having a temperature below the boiling point of water, and then this hot water is used regularly. The electric heater is used to rapidly and efficiently heat to the boiling point (100 ° C.) of the water required for hot water for drinking to obtain hot water for drinking. Therefore, the water heater of the present invention is
The electricity charge per unit volume of hot water can be kept low, and the economical efficiency of the hot water supply device used for supplying hot water for drinking can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a hot water supply device according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Heat storage device, 5 ... Solid heat storage body, 7 ... Electric heater, 8 ... Fan, 10 ... Control device,
11 ... Power supply device, 12 ... Heat exchanger, 1
5 ... 1st hot water storage tank, 19 ... Thermometer, 22 ...
Second hot water storage tank, 25 ... Electric heater, 26 ... Hot water tap.

Claims (1)

[Claims] 1. A heat storage device that heats a solid heat storage body by heating it with an electric heater, a heat exchanger that heats water by heat released from the solid heat storage body of the heat storage device, and a heat exchanger that heats the heat. A hot water temperature adjusting mechanism for adjusting the temperature of water to be kept below the boiling point of water, a first hot water tank for storing the hot water obtained by heating the water in the heat exchanger, and a hot water from the first hot water tank. A second hot water storage tank connected to a hot water tap that receives the supplied water and discharges the hot water to the outside, and the hot water stored in the second hot water storage tank is heated to bring the temperature of the hot water to the boiling point. And an electric heater for supplying heat to the electric heater at midnight to heat the solid heat storage body, and for the second hot water storage tank, supplies electric power to the electric heater to supply electric power to the electric heater. A water heater for heating hot water.