JPS5984048A - Solar heat collecting device - Google Patents

Abstract

PURPOSE:To control starting and stopping of a heat collecting pump without any loss of control by a constitution wherein the starting and stopping of the heat collecting pump is controlled by a value obtained by dividing the amount of sunshine with a temperature difference between the temperatures of a heat accumulating tank and atmosphere. CONSTITUTION:The output voltages of a heat accumulating temperature sensor 8 and an atmosphere temperature sensor 7 output a voltage proportional to the temperature difference between the temperatures of the heat accumulating tank and the atmosphere in a first subtraction circuit 11. The output of a sunshine sensor 6 and the same of the subtraction circuit 11 are inputted into a division unit 17 consisting of first and second logarithmic circuits 10, 12 and the second subtruction circuit 13, a voltage, proportional to a value obtained by dividing the amount of sunshine with the temperature difference between the temperatures of the heat accumulating tank and the atmosphere, is compared, for deciding, with a voltage generated in a reference voltage generating circuit 14 in a decision circuit 15, and the ON-OFF of the heat collecting pump is controlled by inputting an ON-OFF signal into a driving circuit 16. According to this constitution, a decision whether the heat collection is possible or not may be obtained and the useless operation of the heat collecting pump may be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar heat collector in which hot water is stored in a heat storage tank by circulating a heat medium heated by a solar heat collector by operating a heat collection pump. Heater [related to direct heating]

Conventional configuration and problems In this type of conventional solar heat collector, the temperature difference between the heat collector plate temperature and the heat storage tank temperature is used to control the start and stop of the heat collection pump. I was doing it.

However, in this conventional control means, the temperature of the heat collecting plate of the heat collector is the temperature in a state where no heat medium is flowing inside the heat collecting plate before starting, so after starting the heat collecting pump, When the heat medium flows into the heat collecting plate, the temperature of the heat collecting plate of the heat collector decreases, and in this case, the degree of the decrease depends on the amount of solar radiation and the outside temperature.

The temperature of the heat storage tank changes depending on the time elapsed since the heat collection pump stopped, so it is difficult to predict. If you select a large temperature, the heat collection pump will not start when heat collection is possible, and if you select a small temperature, the heat collection bonder will start when heat collection is not possible, resulting in loss, and furthermore, the heat collection pump will not start when heat collection is possible. Even if you try to select the size of the temperature difference that will not cause loss, it will not change due to the above reasons, and the heat collection pump can be started without loss just by the difference between the temperature of the heat collection plate of the heat collector and the temperature of the heat storage tank. , it was impossible to control the stop.

OBJECTS OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a solar heat collection device that can control the start and stop of a heat collection pump without loss.

Structure of the Invention In order to achieve the above-mentioned object, the present invention is configured to control the start and stop of the heat collecting pump based on the value obtained by dividing the amount of solar radiation by the temperature difference between the temperature of the heat storage tank and the outside air temperature. According to this configuration, since it is possible to correctly determine whether heat collection is possible or not, wasteful operation of the heat collection pump is eliminated, resulting in energy conservation, and furthermore, the operation of the heat collection pump when heat collection is not possible is achieved. This also improves the average heat collection efficiency of solar heat collectors because it prevents heat collection and prevents the heat collection pump from not operating when heat collection is possible.
It is possible to make it 1 ni.

A heat storage tank is connected to the solar heat collector 1 through an outgoing pipe 3 and a return pipe 4, 6 is a heat collecting pump installed in the outgoing pipe 3, 6 is a solar radiation sensor, 2 is an outside temperature sensor, and 8 is a heat storage A heat storage tank temperature sensor 9 detects the temperature inside the tank 2, and 9 is a controller. FIG. 2 shows a block diagram of the internal circuit of the controller 9, in which 10 is a first logarithmization circuit that logarithms the output of the solar radiation sensor 6, and 11 is a heat storage tll.
I! a first subtraction circuit that subtracts the output of the temperature sensor 8 and the output of the outside temperature sensor 7; 12 a second logarithmization circuit that logarithms the output of the first subtraction circuit 11; and 13 the first 14 is a reference voltage generation circuit; 16 is the second subtraction circuit 13 and the reference voltage generation circuit 14; A determination circuit that compares the magnitude with the output of I'l], 16tri; a drive circuit that drives the heat collecting pump 5 according to the output of the determination circuit 15; 17 is a dividing section;

The operation in the above configuration will be explained. The heat medium discharged from the heat storage tank 2 is pressurized by the heat collection pump 6 and transported to the solar heat collector 1, where it is humidified by solar radiation, becomes high temperature, and is transferred to the heat storage tank 2. Return to At this time, the extent to which the heat medium is heated in the solar heat collector 1 is proportional to the amount of solar radiation and inversely proportional to the difference in temperature between the temperature of the heat storage tank 2 and the outside air temperature. Therefore, in order to avoid loss when starting and stopping the heat collecting pump 5, if the value obtained by dividing the amount of solar radiation by the difference between the temperature of the heat storage tank 2 and the outside air temperature is above a certain value, the heat collecting pump If 5 is activated, there will be no loss. The limit value in that case is a value determined by the heat collection characteristics of the solar heat collector 1.

FIG. 2 is a block diagram of a control circuit that realizes the start and stop control of the heat collecting pump 6 using an analog electronic circuit.

That is, in this FIG. 2, the co-injection sensor 6 is
Outputs a voltage proportional to one radiation, and heat storage tank temperature sensor 8
outputs a voltage proportional to the heat storage tank temperature, and the outside temperature sensor 7 outputs a voltage proportional to the outside temperature, and the voltage proportional to the heat storage tank temperature and the outside temperature is determined by the first subtraction. The voltage is input to a circuit 11, and the first subtraction circuit 11 outputs a voltage proportional to the difference in temperature between the heat storage tank temperature and the outside air temperature. Solar radiation sensor 6 whose voltage is proportional to the amount of solar radiation
The output of the first subtraction circuit 11, which is a voltage proportional to the temperature difference between the heat storage tank temperature and the outside air temperature, is the output of the first logarithmization circuit 10, the second logarithmization circuit 12, and the second subtraction circuit. circuit 13
A voltage proportional to the value obtained by dividing the amount of solar radiation by the temperature difference between the temperature of the heat storage tank and the outside air temperature is input to the dividing unit 17 consisting of the second a.
It is output from the UV circuit 13 and input to the discrimination circuit 15,
The magnitude of the voltage generated by the reference voltage generation circuit 14 is then compared and determined, and an ON-OFF signal is output from the determination circuit 16 and input to the drive circuit 16. This drive circuit 16
Here, the heat collection pump 6 is controlled to be turned off by the ON-OFF signal from the discrimination circuit 16.

Effects of the Invention As described above, according to the present invention, the starting and stopping of the heat collection pump is controlled by the value obtained by dividing the amount of solar radiation by the difference between the temperature of the heat storage tank and the outside air temperature. When starting and stopping the heat collecting pump, it is possible to correctly determine whether heat collection is possible or not, and as a result, wasteful operation of the heat collecting pump is eliminated, resulting in energy savings and further reduction in the number of heat collectors.
Since it is possible to prevent the heat collection pump from operating when the heat collection function is activated and to prevent the heat collection pump from operating when the heat collection function is activated, the average heat collection efficiency of the solar heat collector can be improved by -1. be.

[Brief explanation of drawings]

FIG. 1 is a piping configuration diagram of a solar heat collector showing an embodiment of the present invention, and FIG. 2 is a block diagram of the internal circuit of the controller in FIG. 1. 1... Solar heat collector, 2... Heat storage tank,
5... Heat collection pump, 6... Solar radiation sensor, 7... Outside temperature sensor, 8... Heat storage tank temperature sensor, 9... Control vessel. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
In the figure

Claims (1)

[Claims] It is equipped with a solar heat collector, a heat storage tank connected to the solar heat collector via piping, and a heat collection pump that circulates a heat medium. A solar heat collector configured to be controlled by a value divided by the difference in temperature from the air temperature.