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.是什么意思_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.在線翻譯_英語_讀音_用法_例句