热时间常数从数秒到数小时不等。
这是由于仪器中不同金属的结点具有不同的热时间常数所致。
This is the result of dissimilar metal junctions in the instrument with different thermal time constants.
在自然辐照条件下测试了内插管式空气集热器的时间常数、瞬态效率，得到了不同流量下的瞬态效率方程。
The time constant and instantaneous efficiency of the feed-tube solar air heater were tested on the solar irradiance. The equation for instantaneous efficiency was obtained at the different flow rate.
推导出了四种结构的热迁移因子、效率因子和时间常数等表达式，搭建了槽式太阳能集热器系统，进行了试验测试和验证。
Expressions of heat removal factor, efficient factor and time constant of the four types of cavity receiver have been deduced and test for trough solar collector system has been set up.
推导出了四种结构的热迁移因子、效率因子和时间常数等表达式，搭建了槽式太阳能集热器系统，进行了试验测试和验证。
Expressions of heat removal factor, efficient factor and time constant of the four types of cavity receiver have been deduced and test for trough solar collector system has been set up.
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