JPH078997Y2 - Downflow type heat collecting sheet - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a flow-through type heat collecting sheet used in facilities such as greenhouse cultivation and hot water pools.

[Prior Art] A technique for collecting water by flowing water along the surface of a resin sheet is well known. Such a technique is roughly classified into a method of adhering water to the back surface of the resin sheet material and flowing it, or a method of flowing water to the front surface of the heat receiving sheet.

[Problems to be solved by the invention] When another sheet is covered with the flowing water of such a conventional resin sheet in close contact with each other, the sheets adhere to each other to prevent water from flowing down, and It will not flow down evenly. Further, there is a drawback that water always remains between the sheets, the water freezes at night, and water cannot flow until the frozen ice is thawed when collecting heat on the next day. Further, it has been found by an experiment conducted by the applicant of the present invention that the resin sheet is stretched or damaged by the weight of water or frozen ice remaining between the resin sheets.

When such a sheet structure is used in a greenhouse for greenhouse cultivation, it is difficult to uniformly flow an appropriate amount of water (for example, several liters / minute per 1 m ^{2 of} heat collecting surface) on the curved surface of a roof having a large curvature. If you try to spread the water all over, the amount of water will inevitably increase. For this reason, it was found that the vinyl sheet was bent due to the weight of water, a considerable load was applied to the frame supporting it, and the transport power was significantly increased compared to the amount of heat collected. This is especially problematic for large greenhouses. It is uneconomical in terms of unit cost to incorporate a frame having sufficient rigidity and necessary structural strength. Moreover, since the amount of water is large, the facilities for the water supply system and the recovery system become large in size, and there is a risk that the cost-saving effect will be extinguished if the labor required for maintenance and the like is taken into consideration.

[Means for Solving the Problems] A heat collecting sheet according to the present invention includes a heat-receiving spacer layer that substantially blocks sunlight between two transparent or translucent resin sheet materials. The layer has a structure in which a flow path of the heat medium is formed between two resin sheets, while the flow direction of the heat medium liquid flowing down is regulated.

The spacer layer is integrated or adhered to the cover resin sheet material or the bottom resin sheet material and can move with respect to the other resin sheet material.

At the same time, the spacer layer substantially forms a heat-receiving surface of a color tone capable of collecting heat by blocking a part of sunlight.

[Operation] According to the above-mentioned structure, a part of sunlight can pass through the resin sheet material and enter a facility such as a vinyl house while collecting the solar heat by the spacer layer. The surface tension of the heat medium liquid flowing down and the pressure difference between the inside and the outside of the sheet material act on the upper and lower resin sheet materials so that these resin sheet materials hold down the heat medium liquid, and at the same time The regulatory effect works. As a result, even if a relatively small amount of heat transfer medium liquid is used, the spacer layer ensures a downflow path, and the heat transfer medium liquid is guided by this downflow path and flows relatively uniformly along the heat receiving surface.

At the same time, the heat-receiving medium liquid flowing down receives the heat of the spacer layer or the spacer layer and the resin sheet material whose temperature has risen by blocking sunlight, and the temperature thereof rises.

[Embodiment] FIG. 1 is a perspective view showing an example of the structure of a flow-through type heat collecting sheet according to the present invention. FIG. 2 is a partially enlarged cross-sectional view taken along the line II-II of FIG.

The flow-through type heat collecting sheet includes a transparent or semitransparent cover resin sheet material 1, a transparent or semitransparent bottom resin sheet material 2 arranged below the cover resin sheet material 1, and these cover resin sheet materials 1. And a spacer layer 3 interposed between the bottom resin sheet material 2 and integrated with or bonded to one of these resin sheet materials.

In the illustrated example, the spacer layer 3 is adhered to the cover resin sheet material 1.

The spacer layer 3 can be made of an elastomer or plastomer synthetic material having excellent weather resistance. When such a material is used, it is adhered to the surface of the resin sheet material by a technique such as painting, screen printing, pasting, or heat rolling, and various patterns are drawn. Alternatively, by pressing the resin sheet material itself,
The integrated uneven surface can also be used as a spacer layer.

The spacer layer 3 provided on one of the resin sheet materials 1 or 2 is not fixed to the other resin sheet material and can move relatively. Therefore, the gap between the cover resin sheet material 1 and the bottom resin sheet material 2 becomes relatively wide depending on the flow rate of the flowing heat medium liquid. If the cover resin sheet material 1, the bottom resin sheet material 2 and the spacer layer 3 are partially connected by welding or the like, the swelling of the cover resin sheet material 1 can be appropriately suppressed.

Above the resin sheet material, for example, a heating medium liquid supply unit (not shown) sandwiched between the cover resin sheet material 1 and the bottom resin sheet material 2 is installed. The heat carrier liquid sprinkled from this supply means flows down while being regulated by the spacer layer 3, and is recovered through an outlet (not shown) provided at a position below the flow path.

FIG. 3 is a cross-sectional view showing an example of application of the above-mentioned flow-through type heat collecting sheet to a greenhouse.

In the illustrated example, the heat collecting sheet is arranged below the transparent surface vinyl 4, the cover resin sheet material 1 is laid over the ceiling beam 5 of the house, and the ceiling beam 5 is used as a heating medium liquid supply means. The heat medium liquid is supplied between the cover resin sheet material 1 and the bottom resin sheet material 2 through the beam.

The heat collector having the above-mentioned flow-down structure can be used by suspending it in a hammock shape, laying it on the roof surface, or suspending it vertically.

[Advantages of the Invention] With the configuration as described above, it is possible to obtain an inexpensive flexible heat collecting sheet which is easy to process and has a very simple structure.

The width of the spacer layer that receives sunlight can be freely selected according to the application, and the amount of transmitted light and the amount of heat collection can be set to the most preferable conditions by appropriately setting the gap between the spacer layers. Can be selected as.

Furthermore, by holding down the heat medium liquid flowing down between the cover resin sheet material and the bottom resin sheet material and regulating the downflow direction by the spacer layer, the heat medium liquid can be spread relatively evenly and flown down.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective view showing a flow-through type heat collecting sheet according to the present invention. FIG. 2 is a partially enlarged cross-sectional view taken along the line II-II of FIG. FIG. 3 is a partial sectional view showing an example of use in a greenhouse. 1 ... Cover resin sheet material 2 ... Bottom resin sheet material 3 ... Spacer layer 5 ... Ceiling beam

Claims (1)

[Scope of utility model registration request] 1. A transparent or semi-transparent cover resin sheet material, a transparent or semi-transparent bottom resin sheet material disposed below the cover resin sheet material, and a cover resin sheet material and a bottom resin sheet material. An intervening and integral or glued to one of the two sheet materials and movable with respect to the other sheet material, the spacer layer being substantially sunlight. Forming a heat receiving surface with a color tone that can collect heat by blocking a part of
A flow-through type heat collecting sheet, characterized in that the heat medium liquid is made to flow down through a gap between the cover resin sheet material and the bottom resin sheet material, while the flow direction of the heat medium liquid flowing down is restricted by the spacer layer.