Kuang Rao, Chen Guo, Jin Yihao, Xiao Juanxiu, Shen Yijun
State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou, 570228, PR China.
School of Energy and Environment, Southeast University, Nanjing, 210096, PR China.
Heliyon. 2023 Feb 26;9(3):e14056. doi: 10.1016/j.heliyon.2023.e14056. eCollection 2023 Mar.
There are large-scale thermal utilization needs in rural and urban fringes in China that can provide many employment opportunities. However, due to the limited use of small and medium-sized coal-fired boilers, thermal energy is actually in short supply. If embedding these spaces including plantations with solar heliostat fields, a large number of nodes for cheap thermal energy supply can be obtained through solar energy, which can create more small-scale industrial and commercial employment opportunities near user side. However, to ensure the crop harvest, plantations are often prohibited from being used for other purposes. In order to verify the idea of coexistence between tower concentrating solar system with sparse heliostat field and plantation, the clean-sky model was used to analyze the shading rate of the heliostat to the ground in each month and the proportion of the area with a relative sunshine duration of less than 80% for the heliostat fields at low, middle, and high latitude areas, and further gave the correction of the above analysis results using typical meteorological year conditions. The results show that heliostats in mid latitude area have obvious adverse effects on overwintering crops. In high latitude area, although the heliostats are more severely blocked in the cold season, there is no planting activity in this season, so the impact on planting can be ignored. The shade ratio of the heliostats to the ground in low, middle and high latitude regions is tolerable in the months suitable for planting, and shade-tolerant crops can also be interplanted in the shaded area to enrich the variety structure. Therefore, by embedding the tower concentrating solar system with a sparse heliostat field, the plantation can meet the two functions of planting and thermal energy supply at the same time to further increase its income.
在中国农村和城市边缘地区存在大规模的热能利用需求，这能提供许多就业机会。然而，由于中小型燃煤锅炉使用受限，热能实际上处于短缺状态。如果在包括种植园在内的这些空间嵌入太阳能定日镜场，就能通过太阳能获得大量廉价热能供应节点，这可以在用户端附近创造更多小规模工商业就业机会。然而，为了确保作物收成，种植园通常被禁止用于其他目的。为了验证带有稀疏定日镜场的塔式聚光太阳能系统与种植园共存的想法，利用晴空模型分析了每个月定日镜对地面的遮光率以及低、中、高纬度地区定日镜场相对日照时长小于80%的区域比例，并进一步使用典型气象年条件对上述分析结果进行了修正。结果表明，中纬度地区的定日镜对越冬作物有明显不利影响。在高纬度地区，虽然定日镜在寒冷季节被遮挡得更严重，但该季节没有种植活动，因此对种植的影响可以忽略不计。在适合种植的月份，低、中、高纬度地区定日镜对地面的遮光率是可以接受的，也可以在阴影区域间种耐荫作物以丰富品种结构。因此，通过嵌入带有稀疏定日镜场的塔式聚光太阳能系统，种植园可以同时满足种植和热能供应这两项功能，从而进一步增加其收入。
