Disk-type solar concentrator focusing plane energy flow density measuring method and measuring device

Abstract

The invention provides a disk-type solar concentrator focusing plane energy flow density measuring method and measuring device. A plurality of thermocouples are arranged on different positions of a focusing plane so as to obtain energy flow density values of the different positions, and the energy flow density distribution of the focusing plane is obtained. The measuring device comprises the plurality of thermocouples, a fixing device, a support, an adjusting device, a data recorder and a computer. The support is fixed on the adjusting device. The fixing device is installed on the support. The plurality of thermocouples are fixed to different positions of the fixing device, and end surfaces of temperature measuring ends of the thermocouples are superposed with the focusing plane of a disk-type solar concentrator. Temperatures measured by the thermocouples are stored to a computer for analysis through the data recorder. The disk-type solar concentrator focusing plane energy flow density measuring method and measuring device solve the problems of conventional direct measurement and indirect measurement, the energy flow density measurement of the disk-type solar concentrator focusing plane is precisely realized, the measurement precision is high, the resolution is high, the structure is simple, the flexibility is high, and the cost is low.

Description

technical field [0001] The invention mainly relates to the technical field of photothermal utilization of dish solar energy, in particular to a method and a measuring device for measuring energy flux density at a focal plane of a dish solar concentrator. Background technique [0002] With the decrease of fossil energy in the world and the increasingly serious international energy, vigorously developing solar energy is an important way to ensure energy security. With the development of solar energy industry, solar concentrating technology has been paid attention to. Among concentrating technologies such as tower, trough, and dish, dish-type concentrating power generation or high-temperature heat utilization technology has the highest efficiency. Dish-type concentrating uses a rotating parabola to reflect sunlight to the focusing plane, which greatly increases the solar energy flux density after concentrating. Installing receivers or Stirling generators on the focal plane co...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used methods for the distribution of energy flux density on the focusing plane of dish solar energy mainly include direct measurement and indirect measurement. Distribution, the energy flow meter or radiometer has a large lighting plane, and the focal spot area after the dish concentrator is concentrated is small, so the number of sensors arranged at the focal plane is limited, and the subsequent numerical interpolation method is used to process the data. This leads to the low resolution of the direct measurement method

At the same time, the structure of the energy flow meter or radiometer is complicated, and it is faced with the high-power concentrated solar energy flow, which is easy to be damaged. During the measurement process, the number of measurement points must be increased by moving its position points. The requirements for the test bench higher

The indirect method to measure the energy flow density field is to use the optical imaging method to measure the energy flow density field. The measurement system is generally composed of ChargeCoupledDevice (CCD camera) or digital imaging radiometer, filter, Lambertian target and data acquisition system. The measurement method has the advantages of high spatial resolution, short data acquisition time, and fast response speed, but it cannot obtain the real energy flux density value. It is necessary to establish a functional relationship between the image and energy flux, and then obtain the energy flux density distribution through inversion

The indirect measurement method needs to use the Lambertian target and the CCD camera, the equipment is expensive, and there are certain requirements for the use conditions of the CCD camera, so the flexibility is poor

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