JPS6040581B2 - Operation control method for solar heat utilization equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for controlling the operation of a solar heat utilization device, and its purpose is to acquire solar heat preferentially and to maximize the amount of hot water used in general households from a temporal perspective. The purpose of this invention is to obtain a method that can control the operation of an auxiliary heating device and utilize heat efficiently.

The configuration of the most common solar heat utilization device will be explained. In FIG. 1, reference numeral 1 denotes a heat collector, which is connected by piping 2 to a heat exchanger 4 in a hot water storage tank 3 via a circulation pump 5. Reference numeral 6 denotes a first temperature detector provided inside the bamboo blind heater 1 to detect the heat collector temperature, 7 a second temperature detector provided inside the flaw storage tank 3 to detect the temperature of the hot water storage tank, and 8 a second temperature detector provided inside the flaw storage tank 3. 1 a temperature difference controller connected to a temperature detector 6 and a second temperature detector 7; 9 an auxiliary heater provided in a part of the hot water storage tank 3; 10 a hot water temperature thermostat provided in the hot water storage tank 3; The operation and stop of the auxiliary heater 9 is controlled.

Next, to describe the electrical circuit used in the secondary, in FIG. An auxiliary heater 9 is connected to the normally closed contact side of the pump 5.

Further, a hot water temperature thermostat 10 is connected to a part of the nine auxiliary heater circuit. Therefore, the difference in temperature between the first temperature detector 6 and the second temperature detector 7 due to the large amount of solar radiation is caused by the temperature difference controller 8.
If the preset operating overflow value is exceeded, the operating contact 12 turns on the circulation pump 5 to perform heat collection operation.

In addition, when there is little sunlight, the temperature difference is less than the operating overflow value, so the heat collection operation is stopped and the auxiliary heater 9 is turned on until the water temperature in the storage tank 3 reaches a certain set value. The auxiliary heating operation is performed while being controlled by the thermostat 10. As mentioned above, the conventional solar heat utilization system which selectively controls heat collection reverse cooling and auxiliary heating operation using the temperature difference controller 8 has the following drawbacks.

Under normal solar radiation conditions and the total amount of hot water, the temperature difference controller 8 detects that the heat collection operation has stopped between 4:00 and 5:00 p.m., and from 6:00 p.m. when the amount of hot water is actually expected to increase. 8 o'clock (
There are only about 1 to 3 hours left until the time for cooking (cooking, bath water supply), and during this time, the auxiliary heater 9 must have a very large heating capacity to bring the water temperature in the hot water tank 3 to the set high temperature in the auxiliary heating operation. It becomes necessary.

Particularly in winter, the amount of heat for auxiliary heating is at its maximum, and in other seasons or other than during heat collection operation, auxiliary heating equipment has more capacity than necessary or is wasted. The present invention eliminates the above-mentioned conventional drawbacks, and the structure thereof will be explained below with reference to the drawings shown as one embodiment.

The heat collecting circuit is the same as that shown in FIG. 1, and will be explained according to the control circuit shown in FIG. It is formed by a temperature difference comparison circuit 14 and operating contacts 15 and 16 corresponding to the temperature difference comparison circuits 13 and 14, respectively.

The circulation pump 5 is connected to the normally open side contact of the operating contact 15,
An auxiliary heater 9 is connected to the normally closed side contact of the operating contact 16 via a hot water temperature thermostat 10. In the above embodiment, only the auxiliary heater operates until the temperature difference value reaches the first set overflow value, and when the temperature difference reaches the first set overflow value, the normally open contact 1
5 is ○N, and it is used together with the heat collecting operation, and when the second set overflow value is reached, the normally closed contact 16 is turned ON, and the auxiliary heater 9 stops operating.

The auxiliary heater 9 is configured to be operated or stopped in conjunction with the operation of the fuel on-off valve, and by manual operation of the fuel on-off valve or operation of a controller such as a timer. The operation of the temperature difference controller 8' will be explained using FIG. The temperature is 5°C higher than that of the previous year.

A line 19 shows the second set differential temperature value by the overflow comparator circuit 14, which is one value higher than the line 17. Lines 20 and 21 are positions 2° C. below the ON-OFF differential from the lines 18 and 19.
A line 22 indicates the maximum temperature of the storage tank, and the hot water temperature thermostat 10 is turned off when the storage tank temperature is 60° C. or higher, regardless of the heat collection temperature. Therefore, the range where the overflow value is 15°C or higher is "heat collection heating" (line 19 or higher), and the range where the overflow value is 15°C or lower and 6°C or higher is "combined heat collection/auxiliary heating operation" (line 19 or higher).
Between line 19 and line 18), the range below 5°C is "auxiliary heating operation" (between line 18 and line 22), and the range where the hot water storage tank temperature is above 60°C is "auxiliary heating stop" (between line 18 and below, line 22 and above). ) can be distinguished from However, depending on the direction of movement, the range may fall within the range of lines 20 and 21. Next, an example of the operation control of the present invention will be described. In FIG. 4, in the early morning before the sun rises, all operations are stopped D because there is no temperature difference.

The auxiliary heating transfer C is started at around 6:00 a.m. using a timer or the like, and high-temperature hot water is stored from the upper part of the hot water storage tank 3. This hot water is used to prepare breakfast from around 7 o'clock.

Around this time, solar radiation is obtained and the operating contact 15 is turned on, so the heat collection/auxiliary heating combined operation B is started. Around 9 o'clock, a considerable amount of solar radiation can be obtained, so the operation contact 16 is turned on, heat collection operation A is started, and the auxiliary heater 9 is stopped.

Then, around 5pm, the amount of solar radiation decreases, so operating contact 16 turns OFF, resulting in combined heat collection and auxiliary heating operation B. At around 5pm, almost no solar radiation is obtained, so operating contact 16 turns OFF. is turned off, the heat collection operation is completed, and the operation shifts to auxiliary heating operation C.

Around this time, you may want to use the hot water supply to prepare for dinner, but since the auxiliary heating operation from 1 hour to 1 hour has already stored quite high temperature hot water in the upper part of the hot water tank 3, make sure to have enough hot water. The auxiliary heating operation is stopped by the hot water temperature thermostat 01 to compensate for the insufficient amount of heat due to the continuous heat collection operation until the use of the water supply such as bathing. After that, it is controlled by a timer and does not start operating until the next morning. In addition, the capacity control device can be configured to be linked with the contact switching so that the capacity of the auxiliary heater is set to "weak" during combined ripening and auxiliary heating operation, and "strong" when only auxiliary heating is operated. can.
Since the present invention adopts the above-mentioned operation control method, ``When a lot of solar heat is obtained, the heat collection efficiency is high and the auxiliary heater is stopped, making it possible to increase the fuel saving rate. By starting auxiliary heating operation even during heat collection operation when the amount of water is low, the capacity of the auxiliary heater can be greatly reduced by taking a longer period of time until the start of large-scale use at night. It can also be made into 4 types.

This is especially effective for stamps that receive little sunlight throughout the day, such as during the winter.

In other words, since heat collection and auxiliary heating can be operated all day long, the hot water supply load can be met with a small auxiliary heating capacity. In addition, it is possible to perform very rational auxiliary heating operation according to the usability of hot water supply and solar radiation conditions, and it can be easily implemented by simply making some improvements using a conventional differential temperature controller, and is inexpensive and reliable. It has a high effect.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the configuration of the solar heat utilization device, Fig. 2 is an electric circuit diagram used in the solar heat utilization device according to the present invention, and Fig. 3
The figure is an explanatory diagram showing an operating state in an embodiment of the present invention.
FIG. 4 is an explanatory diagram showing the operating situation, and FIG. 5 is an electric circuit diagram used in the conventional solar heat utilization device. Figure 1 Figure 2 Figure 3 Figure 5 Figure 4

Claims (1)

[Scope of Claims] 1. In a solar heat utilization device equipped with a heat collector, a hot water storage tank, a circulation pump, an auxiliary heater, etc., a temperature difference between the heat collector temperature and the hot water storage tank temperature is detected, and this temperature difference is detected. The differential temperature controller continuously operates the differential temperature value to control the heat collection operation and the auxiliary heating operation according to the size of the temperature difference value. When the temperature difference between the heat collector and the hot water storage tank is less than or equal to the first set temperature difference value, only the auxiliary heating operation is performed, and when it is equal to or higher than the second set temperature difference value, only the heat collection operation is performed, and the The temperature difference controller controls the circulation pump, the auxiliary heater, etc. so that the heat collecting operation and the auxiliary heating operation are carried out in combination when the temperature difference is greater than or equal to the first set temperature difference value and less than the second set temperature difference value. Operation control method for solar heat utilization equipment. 2 When the temperature difference between the heat collector and the hot water storage tank is less than the first set temperature difference value, the heating capacity of the auxiliary heater is set to high, and when it is more than the first set temperature difference value and less than the second set temperature difference value. 2. The method of controlling the operation of a solar heat utilization device according to claim 1, wherein the heating capacity of the auxiliary heater is controlled by the temperature difference controller so as to make the heating capacity weak.