JPS627969Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved technique for a conventionally well-known flowing down type heat collector.

Conventional flowing-down type heat collectors adopt a method in which heat is exchanged by passing water from above along the upper surface of the plate surface of a wave-shaped, groove-shaped, or flat (Utility Model Application No. 54-140339) black-painted light-receiving plate. These conventional flow-down type heat collectors have the following drawbacks.

First, sunlight is reflected by the water covering the top surface of the black painted surface (reflected by two surfaces: the surface layer of the water and the boundary surface that contacts the painted surface), resulting in a large loss of light reflection. Second,
The water flowing down vaporizes, and a large amount of heat is consumed as vaporization heat, which appears as water droplets on the transparent cover plate or clouds the transparent plate, resulting in a decrease in the amount of light received. These problems inherent to the flow-through type become noticeable when the temperature of the hot water exceeds 40 degrees Celsius, and together with the increase in latent heat loss, they significantly reduce efficiency. Thirdly, even if it is a flow-down type, the conventionally well-known forced circulation type,
As with the natural circulation type and suction type, water leakage accidents may occur due to corrosion of the light receiving surface or poor welding. Unlike other methods, the flow-down type does not apply much pressure to the water as it flows down, but the amount of water leakage is not small. Fourth
In addition, the flow-down type cannot be used with the heat-receiving surface set at a horizontal or nearly vertical angle.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the flowing-down type heat collector.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The heat collector according to the present invention has a substantially sealed box-shaped, cylindrical, etc. space. In the illustrated example, the space 1 is box-shaped. The front wall 2 of this space 1 forms a heat receiving surface coated with black paint or a selective absorption film. There is a spout 3 in the lower part of the space 1, and water is sprayed toward the front wall from above, below, or on the side of the space. In the example shown, 90
A nozzle 4 is attached which sprays water in a fan shape with a spread of at least 120° to 130°. When the nozzle 4 is installed in this manner, water is sprayed downward in the space, and a part of the sprayed water collides with the inner surface of the front wall 2 and spreads over a wide area on the front wall 2 along the wall surface. Some of the particles will flow down, and some of them will float in the space, and the water on the wall will simultaneously function to capture these floating water particles.

Through the operations described above, even a relatively small amount of water instantly spreads over the wall surface and receives heat from the wall surface, raising its temperature. Such movement of the spray water allows for smooth heat transfer due to direct contact between the wall surface and the water, and also promotes agitation of the space and facilitates heat exchange between the wall surface, air, and suspended water particles. By spraying water at the same time, the humidity in the space can be brought close to saturation, making it possible to keep water vaporization heat loss relatively low. Incidentally, when the vaporized water condenses on the inner wall of the space, it releases latent heat and turns into hot water of the same temperature, which is very advantageous in terms of heat balance.

As mentioned above, according to the present invention, water is sprayed onto the inner surface of the heated front wall 2, and the water adheres to this surface and flows down from the upper part of the space to the lower part, so that a relatively small amount of water can cover a large area. A large amount of heat can be removed by washing the inside surface of the front wall.
Unlike conventional flowing-down type heat collectors, there is no chance of steam condensing on the transparent cover plate or water sprinkling on the transparent cover plate, which significantly reduces the transmittance of sunlight.
Furthermore, there is no latent heat loss due to dew condensation on the transparent cover plate or latent heat loss due to water sprinkling on the transparent cover plate. According to the present invention, the sealed space is a substantial heat storage space without steam leakage, and the performance is dramatically improved compared to the conventional flowing-down type heat collector. Furthermore, according to the present invention, even if a portion of the wall surface corrodes and the internal atmosphere leaks, there is an advantage that the amount of water leakage is much smaller than in any of the conventional models. This advantage is very beneficial for built-in panel water heaters where leakage can have a significant negative impact on the building. At the same time, the heat collector of the present invention has the advantage that the installation angle, shape, and size of the device body can be freely selected.

These advantages of the present invention are extremely superior and unprecedented.

[Brief explanation of the drawing]

The accompanying drawing is a longitudinal sectional view showing an example of a configuration of a heat collector according to the present invention. 1: Space, 2: Front wall, 3: Inlet, 4: Nozzle.

Claims (1)

[Scope of utility model registration request] A solar collector having a box-shaped, substantially sealed space whose front wall forms a heat-receiving surface, a transparent plate covering said front wall, a nozzle disposed within said sealed space for spraying water toward the inner surface of the front wall, and a drain outlet provided at the bottom of the sealed space for collecting hot water that flows down from the top to the bottom of said sealed space along the inner surface of the front wall.