JPS5855A - Controlling system for solar heat accumulation - Google Patents

Abstract

PURPOSE:To make heat collected in a heat collector accumulated effectively in a heat accumulation tank by raising the water level in the heat accumulation tank as the heat collecting capability of the heat collector increases. CONSTITUTION:The temperature T0 of the hot water in a heat collector 11 as measured by a temperature sensor 32 and the temperature T1-T3 of the hot water staying layers A, B and C in a heat accumulation tank 12 measured by temperature sensors 33-35 are compared, and based on the results of the comparison the hot water in the heat collector 11 is selectively poured into the heat accumulation tank 12 to a desired level and hot water circulation is effected selectively. It becomes, therefore, always possible to circulate hot water with temperature difference between the hot water in the heat collector 11 and the hot water near the intakes 13a-13c of the heat accumulation tank 1, and heat accumulation with maximum efficiency can be achieved.

Description

[Detailed Description of the Invention] This invention provides a heat collector for absorbing solar heat.
and a heat storage tank that stores hot water that has absorbed heat from this heat collector.
In a solar heat storage control system that includes a pump that circulates water between a heat collector and a heat storage tank, it relates to a system that efficiently controls (storage) the radiant heat of the sun.

Conventionally, the most commonly used control system is a solar heat collector for absorbing solar heat, as shown in Figure 1.
1, a heat storage tank 2 that stores hot water that has absorbed heat in the heat collector 1, and a pump 3 that circulates the hot water. The temperature is measured, and this temperature information is introduced into the temperature difference detection means 6 to detect the temperature difference between the heat collector 1 and the heat storage tank 2, and when the temperature difference reaches a certain value or more, the circulation pump 3 is operated. It is a system that allows

In general, in a heat storage system equipped with a heat collector that collects the sun's radiant heat and a heat storage tank that stores the hot water collected by the heat collector, the collection efficiency is determined by the hot water temperature in the heat collector and the hot water temperature in the heat storage tank. The larger the difference, the higher the value. Therefore, in the above-mentioned conventional system, if the solar radiation becomes weak during the day, for example, and the temperature of the hot water in the heat storage tank is high, heat collection will not be performed, and the heat collection time is relatively uncertain. There was.

This invention was devised to solve the above-mentioned problems, and involves providing a plurality of water inlets and water outlets at different depths of a heat storage tank that stores hot water that has absorbed heat in a heat collector. The inside of the heat storage tank is divided into multiple retention layers, and if the temperature of the hot water in the heat collector is high, the hot water is circulated between the upper retention layer in the heat storage tank and the heat collector. When the hot water temperature inside the tank is low, hot water is circulated between the tW layer in the lower part of the heat storage tank and the heat collector to efficiently collect heat by the heat collector, and at the same time to efficiently store heat in the heat storage tank. It was made in a similar manner.

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a block diagram of a solar heat storage control system according to the present invention.

In Figure 2, 11 is a heat collector, 12 is a heat storage tank, 13 m
, 13b and 13C are water inlets provided at different water depths of the heat storage tank, and 14'' 514b and 14C are water outlets provided corresponding to the water inlets 13a to 13C, respectively. Mizuguchi iaa~13
The inside of the heat storage tank 12 is divided into a plurality of retention layers @ and O by C, 14a to 14C. 15 is a heat collector 11 and a heat storage tank 1
One end of this main pipe 15 is connected to the hot water outlet 16 of the heat collector 11, and the other end is connected to the water inlet of the heat storage tank 12 via branch pipes 17, 18 and 19. 13a, 13b and 13C. Further, 20, 21J and 22 are electromagnetic valves provided in the branch pipes 17, 18 and 19. 23 is the heat storage tank 12
This main pipe 23 is provided with a circulation pump 24, one end of the main pipe 23 is connected to the cold water intake port 25 of the heat collector 11, and the other end is a branch pipe. It is connected to each of the water outlets 14a, 14b and 14C of the heat storage tank 12 via pipes 26, 27 and 28, and a solenoid valve 29 is connected to each of the branch pipes 26, 27 and 28.
, 30 and 31 are provided.

The heat collector 11 is provided with a temperature sensor 32 that measures the temperature of the hot water in the heat collector 11, and each of the retention layers (2), 0, and
Temperature sensors 33, 34 and 3 to measure the hot water temperature of
5 are provided.

The outputs TO to T3 of the temperature sensors 32 to 35 are input to the temperature difference detection means 36, and the detection outputs o1 to 03 of the temperature difference detection means 36 are used to control the circulation pump 24 and the solenoid valve 20.
~23. It is configured so that the operations of 29 to 31 are controlled.

In the above configuration, the temperature of the hot water in the heat collector 11 is measured by the temperature sensor 32, and the measured temperature TO is inputted to the temperature difference detection means 36. In addition, the hot water temperature of each retention layer ■, [phase] and 0 in the heat storage tank 12 is determined by the temperature sensor 3.
3 to 35, respectively, and the measured temperature T1 to
13 is input to the temperature difference detection means 36, and the temperature difference detection means 36 compares the temperature [ro and the temperature 1°1-T3. Now, for example, even at night or during the day, if the weather is bad and the heat is not collected by the heat collector 11 due to the radiant heat of the sun, the water temperature TO in the heat collector 11 will be lower than that of the lowest part of the heat storage tank 12. *[The hot water temperature TI of MIQ is lower than TI, and this state is detected by the temperature difference detection means 36, and the circulation pump 24 is not operated, and each of the solenoid valves 20 to 22 and 29 to 31 is also closed, and the heat collector 11 is Water circulation between the heat storage tank 12 and the heat storage tank 12 is not allowed. Next, in the morning or in the Z direction, when the radiant heat of the sun is weak, a small amount of heat is collected in the heat collector 11, and the hot water temperature in the heat collector 11 is 1"0 or the retention layer in the lowest part of the heat storage tank 12 is 0. If the hot water temperature T3 is higher than the hot water temperature T2 of the intermediate retention layer 0, this state is detected by the temperature difference detection means 36, and the temperature difference between the heat collector 11 and the retention layer 0 of the heat storage tank 12 is detected. Control signals 01 and 04 are output from the detection means 36 so that the hot water circulates, and the solenoid valves 22 and 31 are opened, and the circulation pump 24 is activated, so that the slightly warmed water in the heat collector 11 is sent to the main pipe. 15 and branch pipe 19 to the water inlet 13C at the lowest part of the heat storage tank 12, and the cold water below the storage layer O at the lowest part of the heat storage tank 12 flows into the water outlet 14C.
It flows into the heat collector 11 through the first branch pipe 2B and the main pipe 23. In this way, the lowest part of the heat storage tank 12 is stagnant @f/10
The water will be stored at a slightly lower temperature.

Next, near daytime, the solar radiation is relatively strong, and a relatively large amount of solar radiant heat is collected in the heat collector 11, and the hot water temperature To in the heat collector 11 changes to the stagnation w1wI@ in the middle part of the heat storage tank 12. If the hot water temperature T2 is higher than the hot water temperature T2 in the uppermost retention layer G and lower than the hot water temperature 1.1 l in the uppermost retention layer G, this state is detected by the temperature difference detection means 36 and a control signal is sent. fO1 and 03 are output,
The solenoid valves 21 and 30 are opened to circulate hot water between the heat collector 11 and the Wi trade layer [phase] of the heat storage tank 12, and the circulation pump 24 is activated to circulate hot water in the heat collector ll. The warmed water passes through the main pipe 15 and the branch pipe 18 and flows into the water inlet 13b in the middle part of the heat storage tank 12, and the hot water below the tank 'fiiJ- [phase] in the middle part of the heat storage tank 12 flows into the water outlet 13b in the middle part of the heat storage tank 12.
4b.

It flows into the heat collector 11 through the branch it27 and the main pipe 23. In this case, relatively high-temperature warm water is stored in the storage layer (2) in the middle of the heat storage tank 12.

Next, around 1:00 pm, when the sun is shining, the solar radiation is strong enough to collect enough heat into the heat collector 11, and the hot water temperature TO in the heat collector 11 reaches the uppermost retention layer in the heat storage tank 12. If the hot water temperature η is higher than the temperature difference detection means 36
is detected and outputs control signals o1 and 02,
The solenoid valves 20 and 29 are opened so that hot water circulates between the heat collector 11 and the retention layer 1 of the heat storage tank 12, and
The circulation pump 24 operates, and the sufficiently heated high temperature water in the heat collector 11 flows into the water inlet 13a at the top of the heat storage tank 12 through the main pipe 15 and the branch pipe 17, and the heat water in the heat storage tank 1
The hot water below the storage tank at the top of No. 2 is at the water outlet 141.
It flows into the heat collector 11 through the branch pipe 26 and the main pipe 23. In this way, sufficiently warmed hot water is stored in the retention layer at the top of the heat storage tank 12.

As described above, according to the solar heat storage control system of the present invention, the hot water temperature in the heat collector 11 is compared with the hot water temperature at a plurality of desired height positions in the heat storage tank 12, and based on the comparison result, the heat collecting Since hot water in the heat collector 11 can be selectively flowed into a desired height position in the heat storage tank 12 and hot water circulation can be performed selectively, the hot water in the heat collector and the vicinity of the water inlet in the heat storage tank can always be circulated. It is possible to circulate hot water by creating a temperature difference between it and the hot water in the tank, and to store heat in the most efficient manner.

That is, according to the present invention, as the heat collection capacity of the heat collector increases, the entry position of hot water into the heat storage tank is raised so that the heat collected by the heat collector can be effectively transferred into the heat storage tank. Regardless of whether the weather is sunny, daylight, or the time of day changes, such as morning and evening, daytime, etc., it is always possible to select the optimal hot water circulation under the conditions, and the best possible hot water circulation is possible. Heat can be sent from the heat collector to the heat storage tank and stored there. Therefore, when hot water at a higher temperature is required, it is better to draw hot water from the SW layer ■, and when a large amount of hot water is required even if the temperature is low, the convection circulation inside the tank can be used to prevent excessive stagnation. It also has the advantage of being able to draw hot water from pigeons and supplying hot water at the appropriate temperature in a timely manner according to demand.

In addition, in the embodiment, an example is shown in which the inside of the heat storage tank is divided into three retention layers, but the present invention is not limited to this (or may be divided into two or four or more layers of retention layers). There is no point in saying that it is a good idea to set up a .

Further, in the above embodiment, the pairs of solenoid valves 20, 29, 21.30, and 22.31 are controlled to open and close in cooperation with each other, but the present invention is not limited to this. Instead, it may be possible to select various pairs of solenoid valves to be opened/closed in concert based on weather, time, season, or other factors. For example, by pairing the electromagnetic valves 20.30 and 22.31 and controlling the opening and closing of the electromagnetic valves in synchronization, it is possible to operate a retention layer divided into three layers as a retention layer divided into two layers. becomes.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional control system, and FIG. 2 is a block diagram of a solar heat storage control system according to the present invention. 11... Heat collector, 12... Heat storage tank, 131-13C
...Water inlet, 14@~14C...Water outlet, 16...
- Heat collector internal temperature sensor, 33-35... Heat storage tank internal temperature sensor.

Claims (1)

[Claims] A heat storage tank that stores hot water that has absorbed heat in a heat collector is provided with a plurality of water inlets and water outlets at different water depths, and a heat collector that absorbs solar heat and a plurality of water inlets and water outlets provided in the heat storage tank are provided. A solar heat storage control system characterized in that hot water circulation with a water outlet is selectively performed according to the hot water temperature inside the heat collector and the hot water temperatures at a plurality of positions at different water depths in the heat storage tank.