Solar light collecting method in multi-tower beam-down light collecting system

Abstract

It enhances heat collecting efficiency of sunlight received by heliostats. It is a solar light collecting method in a multi-tower beam-down light collecting system, including a tower selection. The multi-tower beam-down light collecting system is a system in which, in a field where a plurality of beam-down light collecting towers are present, light primarily reflected by heliostats 1 around each tower 4 is secondarily reflected by a reflector 3 at a top part of the tower 4 and is collected on a receiver 3 on the ground, and the tower selection is a process in which, assuming that the heliostat 1 in a given position receives sunlight and reflects the sunlight toward each of optionally selected two of the towers 4, 4, a light receiving quantity on the receiver 3 of each of the towers 4 is compared, and one of the towers 4 in which the light receiving quantity is relatively large is selected to reflect the sunlight toward the one of the towers 4.

Description

TECHNICAL FIELD[0001]The present invention relates to a method of enhancing light collecting efficiency of solar energy in a multi-tower beam-down light collecting system.BACKGROUND ART[0002]Of renewable natural energy, solar thermal energy is very promising as energy to replace fossil fuel, owing to its abundant potential quantity (potential quantity of energy resource). The intensity of solar thermal energy, though it varies depending on locations, is about 1 kW / m2. Thermal energy of sunlight can be sufficiently utilized as an energy source for operating a thermochemical reaction plant, a power generation plant or the like. In order to utilize the solar thermal energy as an energy source, it is required to be efficiently converted into chemical energy or electric energy, and in order to enhance the conversion efficiency, it is required to efficiently collect the sunlight.[0003]The position of the sun relative to a point on the ground changes over time due to the rotation of the ea...

AI Technical Summary

Benefits of technology

[0022]According to the present invention, in the multi-tower beam-down light collecting system, each of the heliostats that are dispersedly arranged on the ground are made to select the tower toward which the reflected sunlight is to be collected, whereby conversion efficiency of the solar energy can be enhanced.

Problems solved by technology

Therefore, an issue in installing the heliostats is that, in order to obtain large quantity of energy, it is necessary to increase the mirror surface area of the heliostats or to increase the number of heliostats.

In such a case, on the east-side surface of the heat collector, the light collecting quantity becomes deficient, with the result that the heat collecting efficiency decreases significantly.

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