JPH0594656U - Heat-collecting surface structure of a downflow solar collector - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To ensure a smooth flow of the downstream heat collecting medium and a desired flow velocity without precipitation of salt or inorganic components. [Structure] A large number of recessed grooves 2 are formed in parallel on a front surface of a sheet material constituting a heat collecting surface 1 of a downflow solar collector along a planned flow direction of a heat collecting medium. A heat collecting surface structure of a downflow solar collector in which an absorption layer 4 of a heat collecting medium is attached in a state of covering at least the edge portion 3 of the groove.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat collecting surface structure of a downflow solar collector, and more particularly, to a heat collecting surface structure in which a heat collecting medium flows down along a front surface of the heat collecting surface for heat exchange.

[0002]

[Problems to be solved by conventional techniques and devices]

 A technique of providing a regulation line on the heat collecting surface and restraining the downward direction of the heat collection medium by this regulation line is disclosed, for example, in Japanese Patent Application No. 62-134376 (Japanese Patent Application Laid-Open No. 63-297966) filed by the same applicant as the present application. It is known by. The use of such a regulation line structure has the advantages that favorable downflow performance is obtained and high heat collection efficiency is obtained. However, on the other hand, although the heat collection efficiency can be improved, the regulation line hinders the downward movement of the heat collecting medium, so that satisfactory results are not always obtained for a low temperature collector with a relatively large flow rate. Also, when a heat collecting medium containing salt or inorganic components such as seawater or groundwater is made to flow down, the contained substances such as salt or calcium are deposited, and these deposits are deposited to prevent the flow of the heat collecting medium. Sometimes. Furthermore, in the case of a collector with a wide heat collecting surface, a large amount of heat collecting medium remains on the heat collecting surface even after the heat collecting medium supply pump stops, and a large load is constantly applied to the heat collecting surface. Not preferable.

An object of the present invention is to provide a heat collecting surface structure having a regulation line that does not hinder the downward movement of the heat collecting medium.

[0004]

[Means for Solving the Problems]

 According to the present invention, a large number of recessed grooves are formed in parallel on the front surface of the sheet material that constitutes the heat collecting surface of the downflow solar collector, along the downflow direction of the expected heat collecting medium. A heat collecting surface structure of a downflow solar collector in which an absorption layer of a heat collecting medium is attached so as to cover at least the edge portion of the recess groove is obtained.

[0005]

[Advantages and Effects of the Invention] With the above-described configuration, the heat collecting medium is slid down along the smooth bottom surface of the recess groove while being sandwiched by the absorbing layers on both sides. As a result, the heat collecting medium flowing down is restrained in the downflow direction by the absorption layer, but the main body portion of the downflowing heat collecting medium can smoothly flow. Therefore, a desired flow rate can be secured without precipitation of salt or inorganic components. In addition, the amount of the heat collecting medium remaining adsorbed in the absorption layer is small for the downflow type low temperature collector which may set a relatively large flow rate of the heat medium, and a large amount of the heat collecting medium is accumulated on the wide area heat collecting surface. It does not remain and a large load is applied.

[0006]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The heat collecting surface structure according to the present invention has a large number of recessed grooves 2 along the planned flow direction of the heat collecting medium on the front surface of the sheet material constituting the heat collecting surface 1 of the downflow solar collector. It is formed in parallel, and an absorbing layer 4 serving as a regulation line of the heat collecting medium is attached in a state of covering at least the edge portion 3 of the recess groove 2.

The absorbing layer 4 can be attached using a printing technique such as silk screen printing or roller printing.

The absorption layer 4 can be attached to a portion other than the edge portion of the recess groove.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a heat collecting surface structure of a downflow collector.

[Explanation of sign]

1: heat collecting surface, 2: concave groove, 3: edge of concave groove,
4: Absorption layer.

Claims (1)

[Scope of utility model registration request] 1. A plurality of recessed grooves are formed in parallel along a downward direction of a planned heat collecting medium on a front surface of a sheet material constituting a heat collecting surface of a downflow solar collector. A heat collecting surface structure of a downflow solar collector in which an absorption layer of a heat collecting medium is attached so as to cover at least an edge portion of the groove.