本文的第一部分对天空长波辐射和天空有效温度的测定方法作了简要评述。
In the first part of this paper some typical methods for measuring sky long wave radiation and sky effective temperature are briefly reviewed.
该测试台首次在实验室测试技术中模拟天空有效温度及室外风速等因素，以反映这些因素对覆盖材料保温性能的影响。
It is the first time to simulate the sky temperature and wind velocity outside of greenhouse in the laboratory to measure their infections to the thermal properties of the covering materials.
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