Research Papers

Study on the Performance of a Curved Fresnel Solar Concentrated System With Seasonal Underground Heat Storage for the Greenhouse Application

[+] Author and Article Information
Zhiyong Li

School of Mechanical Engineering,
Beijing Institute of Technology,
Beijing 100081, China;
College of Architecture Engineering,
North China University of Technology,
Beijing 100144, China

Xinglong Ma, Yunsheng Zhao

School of Mechanical Engineering,
Beijing Institute of Technology,
Beijing 100081, China

Hongfei Zheng

School of Mechanical Engineering,
Beijing Institute of Technology,
Beijing 100081, China
e-mail: hongfeizh@bit.edu.cn

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received November 23, 2017; final manuscript received June 27, 2018; published online August 20, 2018. Assoc. Editor: Ming Qu.

J. Sol. Energy Eng 141(1), 011004 (Aug 20, 2018) (9 pages) Paper No: SOL-17-1463; doi: 10.1115/1.4040839 History: Received November 23, 2017; Revised June 27, 2018

A solar heating system in greenhouse driven by Fresnel lens concentrator is built in this study. This system uses a soil thermal storage for greenhouse to supply heat in the absence of sunlight, ensuring the safety of the growth of crops. The structure and working principle of the device are introduced in this paper. The underground soil temperature was tested, compared with the indoor and outdoor temperature. The experimental testing result is given. A research shows that when the heating pipe buried 1.65 m underground, the time of heat transfer to the ground is about 5 days. The overall temperature rise of the soil is about 4 °C. In the condition of the coldest weather without additional energy supplement, the greenhouse's temperature is guaranteed above 8 °C, which can ensure the minimum temperature requirements of crop growth. According to the structural parameters of the existing system, the simulation of underground soil heat transfer and heat storage performance was carried out. Then, the temperature curves of different buried depths of the tube are given. The soil temperature steady time in different pipe-buried depths of heat storage temperature is theoretically calculated. It is proved that, to achieve the seasonal thermal storage in this system, the buried depth of the pipe should be over 2.5 m.

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Fig. 1

System schematic diagram

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Fig. 2

Photo of the system

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Fig. 3

Structure of the transmission type Fresnel line concentrator

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Fig. 4

Layout of measuring points

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Fig. 5

Temperature curves at different depths of indoor and outdoor air and soil

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Fig. 6

Temperature changes in the horizontal direction on the XZ plane of the B line

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Fig. 7

Temperature in the vertical direction of the XZ plane of the B line

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Fig. 8

Heat transfer model of pipe heating to soil

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Fig. 9

Temperature of different points varies with the depth is 1.5 m



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