Novel coiled hollow fiber module for high-performance membrane distillation

Area of Science:

• Chemical Engineering
• Materials Science

Background:

• Membrane distillation (MD) scale-up faces challenges with heat recovery and temperature polarization (TP).
• Direct contact membrane distillation (DCMD) modules exhibit low thermal efficiency due to heat loss along the membrane length.

Purpose of the Study:

• To introduce and evaluate a novel coiled hollow fiber (CHF) module design for DCMD.
• To decouple feed flow direction from the membrane surface to mitigate TP effects.

Main Methods:

• Experimental and computational analyses were used to compare CHF modules with conventional designs.
• Performance was evaluated based on flux, thermal efficiency, and energy consumption.

Main Results:

• The CHF module design effectively mitigates the TP effect in hollow fiber DCMD (HF DCMD).
• Flux increased by 148% (cross-flow) and 163% (localized heating - LH mode).
• CHF in LH mode demonstrated an 81% reduction in energy consumption compared to conventional designs.

Conclusions:

• The CHF module design offers a significant advancement for efficient and high-performing DCMD.
• This innovation presents a new pathway for improving MD technology.
• The CHF design successfully addresses key limitations in current DCMD module performance.