JPH05240509A - Control method for temperature of hot water supplied by heat storage type electrical hot water supplying apparatus - Google Patents

Abstract

PURPOSE:To provide a method for controlling temperature of feeding hot water of a heat storage type electrical hot water storage apparatus capable of getting a sufficient high hot water temperature under an effective utilization of heat stored in a solid heat storage body. CONSTITUTION:In a heat storage type electrical hot water supplying apparatus, a heating calorie discharged from a solid heat storage body 3 and the temperature of hot water stored in the hot water storage tank 6 are monitored and in the case that the temperature of the solid heat storage body 3 is more than the certain high level, the rotation of the fan 4 is continued. In the case that the temperature of the solid heat storage body 3 is lower than a certain high level, water is supplied to the hot water storage tank 6 and then the rotations of the fan 4 and the first pump 8 are stopped.

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 temperature control method for a heat storage type electric hot water supply device.

[0002]

2. Description of the Related Art Some electric water heaters use a solid regenerator as a heat source. Further, in this heat storage type electric hot water supply device, a heating element, a solid heat storage element which is heated by the heating element and accumulates heat, and air is sent to the solid heat storage element to be heated by heat released from the solid heat storage element. A fan, a heat exchanger for exchanging heat between air and water heated by the heat released from the solid heat storage body, and a hot water storage tank for storing hot water obtained by heating the water in the heat exchanger. , A first pump that circulates water between the heat exchanger and the hot water storage tank, a water tap that discharges hot water accumulated in the hot water storage tank, and a second pump that circulates hot water between the hot water storage tank and the water tap. There is a device including a pump.

Conventionally, in the case of controlling the temperature of hot water stored in a hot water storage tank in this thermal electric water heater,
The temperature of the hot water stored in the hot water storage tank was monitored, and the number of revolutions of the fan was controlled so as to reach the target temperature of the hot water.

For example, when the rotational speed of the fan is increased, the amount of air sent by the fan is increased to increase the amount of heat dissipated by the solid heat storage body. The temperature of the water is raised.

[0005]

However, this hot water temperature control method has the following problems.

If the first pump is rotated in addition to the rotation of the fan when the temperature of the solid heat storage body is decreased, the temperature of the hot water cannot be sufficiently raised because the entire device operates at low output.

By the way, when the hot water stored in the hot water storage tank is used and the amount of hot water decreases, the water is supplied from the outside. In this case, if the output operation is low as described above, the hot water temperature of the hot water storage tank may be lowered.

The present invention has been made in view of the above circumstances, and provides a hot water supply temperature control method for a heat storage type electric hot water supply device capable of obtaining a sufficient hot water temperature by effectively using the heat stored in a solid heat storage body. The purpose is to do.

[0009]

In order to achieve the above object, a hot water supply temperature control method for a heat storage type electric hot water supply device according to the present invention comprises:
A heating element, a solid heat storage element that is heated by the heating element to accumulate heat, a fan that sends air to the solid heat storage element and heats it with the heat released from the solid heat storage element, and a solid heat storage element that releases the heat. Heat exchanger for exchanging heat between the air and water heated by the heat, a hot water storage tank for storing hot water obtained by heating water in the heat exchanger, the heat exchanger and the hot water storage A first pump that circulates water between the tank, a water tap that discharges hot water stored in the hot water storage tank, and a second pump that circulates the hot water between the hot water storage tank and the water tap. In a heat storage type electric hot water supply device comprising: a solid heat storage body, both the amount of heat released from the solid heat storage body and the temperature of the hot water stored in the hot water storage tank are monitored, and the temperature of the solid heat storage body is higher than a certain height. In case of When the temperature of the solid heat storage body is lower than a certain height, the rotation of the fan and the first pump is stopped when water is being supplied to the hot water storage tank. It is what

[0010]

[Function] By considering the amount of heat released from the solid heat storage body in addition to the temperature of the hot water stored in the hot water storage tank, the heat stored in the solid heat storage body is effectively used to obtain a sufficient hot water temperature. be able to.

Particularly when the temperature of the solid heat storage body is lowered, the rotation of the fan and the first pump are stopped when water is being supplied to the hot water storage tank, so that the temperature of the hot water stored in the hot water storage tank is stopped. The heat stored in the solid heat storage body can be effectively used without lowering the temperature.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The heat storage type electric hot water supply apparatus to which the present invention is applied will be described.

In FIG. 1, 1 is a case, 2 is a heating element,
Reference numeral 3 denotes a solid heat storage body that is provided inside the case 1 and is heated by a heat generating body 2 to store heat. Reference numeral 4 denotes a fan that sends air to the solid heat storage body 3 to heat air by the heat released from the solid heat storage body 3. Reference numeral 5 denotes a heat exchanger for exchanging heat between air and water heated by the heat released from the solid heat storage body 3,
6 is a hot water storage tank for storing hot water obtained by heating water in the heat exchanger 5, 7 is a first circulation path connecting the heat exchanger 5 and the hot water storage tank 6, and 8 is water in the first circulation path 7. , 9 is a water supply tap for discharging hot water stored in the hot water storage tank 6, 10 is a second circulation path connecting the hot water storage tank 6 and the water supply tap 9, and 11 is the second circulation path 10 A second pump that circulates hot water at 12, a controller, 13 is a thermometer that measures the temperature of the solid heat storage body 3, 14 is a thermometer that measures the temperature of hot water flowing through the first circulation path 7, and 15 is It is a flow meter provided in a water supply channel 16 for supplying water to the hot water storage tank. A method of controlling the temperature of the hot water stored in the hot water storage tank 6 will be described. Here, the temperature at which the solid heat storage body 3 stores heat is 250 ° C.
Is the standard and can accumulate at temperatures up to 650 ° C.

The temperature of the solid regenerator 3 is, for example, 250.degree.
The output of the heat storage type electric water heater is 100% to 50 ° C.
It becomes 260%. At this time, both the amount of heat released from the solid heat storage body 3 and the temperature of the hot water stored in the hot water storage tank 6 are monitored, and the fan 4 is rotated so as to obtain the required hot water temperature. The controller 12 receives the temperature information of the solid heat storage body 3 output from the thermometer 13 to measure the amount of heat released from the solid heat storage body 3, and receives the temperature information output from the thermometer 13 to receive the hot water storage tank. Estimate the temperature of hot water stored in 6. The controller 12 controls the operation of the fan 4, the first pump 8 and the second pump 11. Therefore, heat radiation can be controlled appropriately for the solid heat storage body 3, and the solid heat storage body 3
A sufficient temperature of hot water can be obtained by effectively using the heat stored in.

The temperature of the solid regenerator 3 is, for example, 100 ° C. to 2
The output of the heat storage type electric water heater is between 40% and 8 during 50 ° C.
It is 0%. In this case, control differs depending on whether water is supplied to the hot water storage tank 6 through the water supply passage 16 or not. Presence or absence of water supply to the hot water storage tank 6 is detected.

When water is being supplied to the hot water storage tank 6, the rotation of the fan 4 is stopped and the first pump 8 is also stopped. As a result, the action of heating air by the solid heat storage body 3 is not performed, and hot water is not stirred in the hot water storage tank 6. As a result, the temperature of the hot water in the hot water storage tank 6 does not drop, and the heat accumulated in the solid heat storage body 3 can be taken out by nearly 100%. The temperature of the hot water in the hot water storage tank 6 does not decrease because the first pump 8 stops and the hot water storage tank 6
This is because the temperature generation layer of the hot water is not remarkably destroyed. The present invention is not limited to the above-mentioned embodiment, and can be implemented with various modifications.

[0017]

As described above, according to the present invention, there is obtained a hot water supply temperature control method for a heat storage type electric hot water supply device capable of obtaining a sufficient hot water temperature by effectively using the heat stored in a solid heat storage body. be able to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a heat storage type electric water heater as an embodiment of the present invention.

[Explanation of symbols]

2 ... Heating element, 3 ... Solid heat storage element, 5 ... Heat exchanger, 6 ... Tank, 8, 11 ... Pump.

Claims (1)

[Claims] 1. A heating element, a solid heat storage body that is heated by the heating body to accumulate heat, a fan that sends air to the solid heat storage body to heat the solid heat storage body and heats the solid heat storage body, and the solid body. A heat exchanger for exchanging heat between the air and water heated by the heat released from the heat storage body, a hot water storage tank for storing hot water obtained by heating water in the heat exchanger, and the heat A first pump that circulates water between the exchanger and the hot water storage tank, a water tap that discharges hot water stored in the hot water storage tank, and circulates the hot water between the hot water storage tank and the water tap. In a heat storage type electric hot water supply device comprising a second pump, both the heat amount of heat released from the solid heat storage body and the temperature of the hot water stored in the hot water storage tank are monitored, and the temperature of the solid heat storage body is monitored. If there is a certain height or more, When the temperature of the solid heat storage body is lower than a certain height, the rotation of the fan and the first pump is stopped when water is being supplied to the hot water storage tank. A method for controlling a hot water supply temperature of a heat storage type electric hot water supply device, comprising: