结果和方法对进一步完善基本对流换热过程的热力学评价具有一定的意义，同时为换热管双侧强化传热时性能的评价提供理论基础。
The results from this paper provide a reference for the thermodynamic performance evaluation on the basic heat transfer process through a duct and enhancement in double sides of duct.
本实用新型公开了一种双二级热管式太阳能热水器，包括集热单元（4）、传热单 元以及水箱（3）。
The utility model discloses a dual-two-stage-heat pipe solar water heater comprising a heat collection unit (4), a heat transfer unit and a water tank (3).
后窗台板左右侧也装有相同的扬声器。还有两个低间扬声器安装在杂物搁板内通风格栅下的双盘形散热管内。
The same loudspeakers are then also fitted on the left - and right-hand side of the rear window shelf, with two woofers installed in double coils beneath the air vent grids in the parcel shelf area.
后窗台板左右侧也装有相同的扬声器。还有两个低间扬声器安装在杂物搁板内通风格栅下的双盘形散热管内。
The same loudspeakers are then also fitted on the left - and right-hand side of the rear window shelf, with two woofers installed in double coils beneath the air vent grids in the parcel shelf area.
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