Volume 8 Issue 1 pp. 110-119 • doi: 10.15627/jd.2021.8

# Optical Analysis of A Sliding-Type Cylindrical Fresnel Lens Concentrating Collector for Agricultural Greenhouse

Qian He,a Hongfei Zheng,a Xinglong Ma,a Ge Wang*,a,b

Author affiliations

a School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China
b School of Physics and Electronics, Nanning Normal University, Nanning 530001, China

*Corresponding author.
526560656@qq.com (Q. He)
hongfeizh@bit.edu.cn (H. Zheng)
baalxmxl@yeah.net (X. Ma)
11720194@qq.com (G. Wang)

History: Received 25 October 2020 | Revised 25 December 2020 | Accepted 11 January 2021 | Published online 10 March 2021

Citation: Qian He, Hongfei Zheng, Xinglong Ma, Ge Wang, Optical Analysis of A Sliding-Type Cylindrical Fresnel Lens Concentrating Collector for Agricultural Greenhouse, Journal of Daylighting 8 (2021) 110-119. https://dx.doi.org/10.15627/jd.2021.8

Figures and tables

## Abstract

### 4.2. Application prospect

We designed a sliding-type cylindrical Fresnel lens concentrating collector for an agricultural greenhouse, not only can energy be used efficiently but the land utilization rate can be improved. It realizes the "agricultural and optical complementation" efficiently. Combining agricultural planting with solar energy collection and power generation has a very valuable development prospect, especially for some remote areas with high latitude. It is used for greenhouse insulation in cold winter, and can be used for power generation in sunny summer. The output can both face to greenhouse and customers.

Generally speaking, solar energy collection system can be used in many engineering systems, such as desalination or power generation. For some areas closing to the coastal or inland areas where water shortage is scarce, heat can be used for desalination of seawater or brackish water for agricultural irrigation.

### 4.3. Future work

Greenhouse itself is a facility to use solar energy, but there is still a part of the energy that is not effectively used. There is still a large space for the development of solar thermal technology in greenhouse. Two major problems are as follows. The first is the low efficiency of heat collection. Due to the influence of traditional solar energy collection methods (such as trough and flat plate), the heat collection area is very limited. It is difficult to meet the requirements of greenhouse heating at night in winter. The second is insufficient heat preservation and uneven indoor illumination. Due to the structure of greenhouse itself, the difference of light intensity is large.

Therefore, the innovation of this paper is mainly to solve the first kind of problems. Combining the transmission and heat collection or power generation technology with modern new agricultural engineering, a new energy-saving idea based on Fresnel lens is put forward. It builds a sliding track to track the concentrating light in the greenhouse coverage. The advantages of the system are to improve the utilization efficiency of greenhouse space, and obtain the high efficiency and low cost of the overall system. This operation mode is not only a new energy project, but also an interdisciplinary subject. The concept of complementary agriculture and light has good innovation. However, there is no research and optimization of agricultural greenhouse covering materials. In the follow-up research process, this aspect can be considered in the greenhouse design to build a more optimized new agricultural greenhouse.

In addition, the primary concentrator is not a large-scale Fresnel lens, so the receiving angle is small. The inclination incidence angle of the sun designed in this paper is only 76° and can only meet the high-efficiency heat collection of 5-6 hours under normal sunlight conditions. The energy obtained is mainly used for greenhouse heat preservation and heat storage. If more generated electricity needs to be transported to users, a larger concentrating and heat collecting system is needed to be re-designed. That is to say, the large-scale commercial agricultural greenhouse is the future development direction and work goal.

## Acknowledgment

This work is supported by the National Science Foundation of China (No.51976013).

## Contributions

The simulation and writing work of this paper are completed by Q. He. The idea behind this work is provided by H. Zheng. The simulation work of this paper is completed under the guidance of X. Ma and G. Wang.

## Declaration of competing interest

The authors report no conflicts of interests.

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