JPH0123085Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a solar heat collection device that collects heat by circulating a heating medium.

<Prior art> Conventionally, in an indirect heating type solar heat collection device in which a heat exchanger 1 raises the temperature of fluid in a heat storage tank 2,
As shown in Fig. 2, there is a bottom open system in which the heat medium storage tank 4 provided in the outer box 3 of the heat storage tank 2 below is opened to the atmosphere without opening the top of the return pipe of the heat medium circulation circuit A, and as shown in Fig. 3. The mainstream is an open top system in which an open tank 5 is provided at the top of the return pipe of the heat medium circulation circuit A. Both systems have their advantages and disadvantages, and neither system can be said to have a high savings rate or be easy to install and maintain.

In other words, the bottom-open system has the following advantages: (a) It is possible to inject and replenish heat medium in two parts of the heat storage tank without climbing up to the roof.

(b) The flow rate of the heating medium can be confirmed on the ground, and the concentration and
Construction and maintenance are easy, including easy PH management.

On the other hand, the disadvantages are (i) The upper heating medium in the heat collection circuit is prone to water dripping.
That is, since the internal pressure around the upper heat collector is lower than atmospheric pressure, even if a small amount of air is sucked in from the piping connections, water will fall into the tank. In addition, since the pressure is negative, boiling is more likely to occur than in a top-open system, and when the heat medium temperature is high such as during overheat collection, boiling is relatively easy to occur when the pump 7 is stopped.
A volume equivalent of the steam generated in the heat collector 6 due to boiling returns to the heat medium tank 4 in the same manner as the suction water.

(ii) Due to the high frequency of falling water, the circulation pump 7 must have the ability to push up to the top of the heat collector 6.
For this reason, the circulation pump 7 requires a large input, which is a major drawback for economizing equipment.

On the other hand, the top open system has the following advantages: (a) Once the heating medium is injected, it will not fall into the water, so the circulation pump 7 can be small. In other words, a small input type is sufficient.

(b) Since the open tank 5 does not need to receive falling water, it may have a small capacity. Also, the tank is a heat collector 6
Since it is located on the side, the heat storage tank 2 and outer box 3 can be small.

The disadvantage is that it is difficult to inject and replenish the heat medium, which is disadvantageous in terms of maintenance management, which is important for solar heat collectors.

<Purpose> In view of the above, the present invention aims to provide a solar heat collector that can suppress the boiling and expansion of the heat medium and prevent the heat medium from falling from the heat collector, and can easily check and replenish the amount of heat medium. The purpose is

<Embodiment> Hereinafter, an embodiment of the present invention will be explained based on FIG.
, the heat medium heated by the heat collector 11 and the heat storage tank 12
A heat exchanger 13 that exchanges heat with the fluid inside, an outgoing pipe 14 that connects the outlet side of the heat exchanger 13 and the inlet side of the heat collector 11, and a heat exchanger 14 that exchanges heat with the outlet side of the heat collector 11. A heat medium circulation circuit B is constituted by a return pipe 15 connecting the inlet side of the vessel 13, and a circulation pump 16 and a closed heat medium replenishment tank 17 are provided on the heat exchanger 13 side of the return pipe 14. An expansion tank 19 is provided on the outlet side of the heat collector 11 and has a check valve 18 that prevents air from flowing into the heat medium circulation circuit B in the suction direction.

The heat collector 11 and the expansion tank 19 are arranged on the roof, and the circulation pump 16 and the replenishment tank 17 are installed inside the outer box 20 of the heat storage tank 12. The replenishment tank 17 has a tank body 1 with a liquid level confirmation window 17a.
7b and a supply lid 17c that closes the upper opening thereof, and the bottom of the main body 17b and the outgoing pipe 14 are connected to each other by a pipe 21.

On the other hand, the expansion tank 19 on the roof has an inlet 22a communicating with the heat collector 11 and an outlet 22b communicating with the heat exchanger 13 at the bottom of the tank. The check valve 18 connects the upper opening of the tank to the valve hole 2.
3, it consists of a valve seat 24 formed on its peripheral wall, and a valve element 24 that can be seated on and taken off from the valve seat 24. The valve element 24 includes a valve stem 25 fitted into the valve element 23 so as to be vertically movable, and a ball part 26 provided at the upper end of the valve stem 25 so as to be able to be seated on and removed from the valve seat 24 from above.
and a float 27 fixed to the lower end of the valve stem 25. In addition, 28 is a hot water tap 29, and a hot water supply path 30 is a water supply channel.

In the above configuration, the heat medium collected and heated in the heat collector 11 by the operation of the circulation pump 16 passes through the expansion tank 19 and the return pipe 15, and gives heat to the fluid in the heat storage tank 12 in the heat exchanger 13. The fluid is heated, and the cooled heat medium is returned to the heat collector 11 from the outgoing pipe 14 by the circulation pump 16. By repeating this cycle, the fluid in the heat storage tank 12 is heated to a set temperature.

Here, the heating medium normally forms an open top system (regardless of operation or stoppage) in the heating medium circulation circuit B.
That is, the lower replenishment tank 17 is sealed by the replenishment lid 17c, and the upper expansion tank 19 is maintained at atmospheric pressure by the air vent check valve 18. On the other hand, when the replenishment lid 17c is opened for the purpose of replenishing heat medium, etc., the check valve 18 at the top is closed to prevent the heat medium from falling. In other words, it forms a bottom open system (suspended system). In this way, an ideal system that combines the advantages of both systems is realized.

To summarize the above, (a) When the heat medium boils, boiling itself is difficult to occur because the inside of the heat collector 11 is at atmospheric pressure. That is, the boiled heat medium vapor passes through the expansion tank 19 and the check valve 18 and is released into the atmosphere.

(b) When the heating medium expands, it is contained in the expansion tank 19.

(c) Even if air gets mixed into the heating medium circulation circuit B, the heating medium will not fall into the water because the replenishment tank 17 is sealed.

(d) Replenishment of the heating medium can be easily carried out by opening the replenishment lid 17c of the replenishment tank 17 on the ground side, and at this time, the action of the check valve 18 prevents the intake of air, so that the heating medium does not fall into the water. do not.

(e) The amount of heat medium in the heat medium circulation circuit B can be easily checked on a daily basis through the confirmation window 17a in the replenishment tank 17 located on the ground.

(F) In the circulation pump 16, the heat medium is injected (initial time) from the expansion tank 19, and the heat medium does not fall into the water after that, so the circulation pump 16 can be used with a low pump head, that is, a low input pump, and costs can be reduced.

<Effects> As is clear from the above description, the present invention includes a heat collector that collects solar heat, a heat exchanger that exchanges heat between the heat medium heated by the heat collector and the fluid in the heat storage tank.
A heat medium circulation circuit is composed of an outgoing pipe that connects the outlet side of the heat exchanger and the inlet side of the heat collector, and a return pipe that connects the outlet side of the heat collector and the inlet side of the heat exchanger. A circulation pump and a closed heat medium replenishment tank are provided on the heat exchanger side of the outbound pipe, and a check valve is provided on the outlet side of the heat collector to check air in the suction direction of the heat medium circulation circuit. An expansion tank is provided.

Therefore, according to the present invention, boiling and expansion of the heating medium can be suppressed, preventing the heating medium from falling from the collector, and the solar heat collecting device can be easily confirmed and replenished with the amount of the heating medium. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a solar heat collector showing an embodiment of the present invention, Fig. 2 is a block diagram of a conventional open-bottom solar heat collector, and Fig. 3 is a conventional open-top solar heat collector. FIG. 11: Heat collector, 12: Heat storage tank, 13: Heat exchanger, 14: Outgoing pipe, 15: Returning pipe, 16: Circulation pump, 17: Supply tank, 18: Check valve, 19: Expansion tank.

Claims (1)

[Scope of utility model registration request] A heat collector that collects solar heat, a heat exchanger that exchanges heat between a heat medium heated by the heat collector and a fluid in a heat storage tank, an outlet side of the heat exchanger, and an inlet side of the heat collector. A heat medium circulation circuit is constituted by an outgoing pipe that connects the heat exchanger, and a return pipe that connects the outlet side of the heat collector and the inlet side of the heat exchanger, and a circulation pump and a sealed airtight pipe are installed on the heat exchanger side of the outgoing pipe. A solar heat collector characterized in that a heat medium replenishment tank of the form of a shape is provided, and an expansion tank having a check valve for blocking air in the suction direction of the heat medium circulation circuit is provided on the outlet side of the heat collector. thermal equipment.