1. Condensable gas exhibits some unusual behavior in polymer membrane compared with permanent gas.

2. Membrane separation processes with condensable gas such as water vapor removing from industrial gases and organic vapor recovery or separation are being developed recently and have great potential.

3. Analyses the source of non- condensable gas and its bad impact on Lithium Bromide absorption chillers. Presents the management methods of air tightness and vacuum degree.

4. Analyses the source of non - condensable gas and its bad impact on Lithium Bromide absorption chillers.

5. Suitable for pumping Toxic, Corrosive and condensable gas by special coating.

6. As a condensable gas, the water vapor permeates through membranes become more complicated than non - condensable gases.

7. In order to maintain the vacuum in evaporator, the vacuum-pump was displaced by the condenser for auto-draining non- condensable gas.

8. In condensation heat transfer process, the presence of non - condensable gas greatly deteriorates the heat transfer efficiency.

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9. The vapor liquid two boundary layer model is applied to predict local mass concentration of the non condensable gas, temperature profiles and velocity profiles in the boundary layer.

10. As the superconductive tube is made of special material, it has good compatibility and no non- condensable gas occurs so its service life can be prolonged and it has no harmful to human bodies.

11. It is shown that mass concentration and velocity of the non condensable gas increase while temperature decreases from the bulk of the vapor to the interface.

12. Film condensation heat transfer characteristics are studied by numerical simulation for a single horizontal tube in the presence of a non condensable gas.