Humidifying module

A humidifying module comprising:

• a plurality of hollow fiber membranes grouped together to form a hollow fiber membrane bundle, wherein a moisture exchange is performed across a thickness of each hollow fiber membrane between fluid streaming within an interior of said each hollow fiber membrane and along an exterior of said each hollow fiber membrane;
• a hollow, cylindrical shaped inner flow passage inserted within said hollow fiber membrane bundle, wherein a longitudinal length of said inner flow passage is shorter than a longitudinal length of said hollow fiber membrane bundle, and wherein said inner flow passage includes:
• an inlet and an outlet through which the fluid passes, and
• an end wall located near said outlet;
• and
• a protrusion disposed at said end wall wherein an inner cross-sectional area of said inner flow passage gradually decreases in a direction taken from an inlet of said inner flow passage toward said end wall.

A humidifying module comprising:

• a plurality of hollow fiber membranes grouped together to form a hollow fiber membrane bundle, wherein a moisture exchange is performed across a thickness of each hollow fiber membrane between fluid streaming within an interior of said each hollow fiber membrane and along an exterior of said each hollow fiber membrane;
• a hollow, square shaped inner flow passage inserted within said hollow fiber membrane bundle, wherein a longitudinal length of said inner flow passage is shorter than a longitudinal length of said hollow fiber membrane bundle, and wherein said inner flow passage includes:
• an inlet and an outlet through which the fluid passes, and
• an end wall located near said outlet;
• and
• a protrusion disposed at said end wall wherein an inner cross-sectional area of said inner flow passage gradually decreases in a direction taken from an inlet of said inner flow passage toward said end wall.