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How to decide the alignment of the parabolic trough collector according to the local latitude

机译：如何根据当地纬度决定抛物线槽收集器的对齐

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Parabolic trough is a very attractive technology for using solar energy. The optical loss of the parabolic trough is related with the local latitude, either for the east-west (E-W) or north-south (N-S) orienting mounted troughs. Based on the basic transform between solar coordinate and the earth surface coordinate, the cosine loss of for both the E-W and N-S parabolic troughs are calculated, according to the local latitude. The results indicate that, while the optical loss for E-W trough almost keeps as a constant of 16%, the optical loss for N-S system is highly dependent on the local latitude. Thus the critical latitude of 37.35° is obtained. For the place where its latitude is lower than 37.35°, the parabolic trough should be mounted along E-W orientation, otherwise it should be positioned in N-S orientation, to obtain the least cosine loss.
机译：抛物线低谷是一种使用太阳能的非常有吸引力的技术。抛物线槽的光学损失与局部纬度有关，用于东方（E-W）或南北（N-S）定向安装的槽。根据太阳能坐标和地球表面坐标之间的基本变换，根据本地纬度，计算E-W和N-S抛物线槽的余弦损失。结果表明，虽然E-W槽的光学损耗几乎保持为16％的恒定，但是N-S系统的光学损耗高度依赖于局部纬度。因此，获得37.35°的关键纬度。对于其纬度低于37.35°的地方，抛物线槽应沿E-W取向安装，否则应以N-S取向定位，以获得最余量的损耗。

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