Patent ID: 8414833

Claim:
An apparatus comprising: a first substrate including a first fluid-flow channel having a serpentine portion in a first section of said first substrate; a second substrate including a fluid-flow second channel having a serpentine portion and a cavity; said cavity being positioned in a first section of said second substrate and adjacent to said serpentine portion of said first channel; a gas permeable membrane disposed between said first and the second substrates, a heater positioned on said first section of said first substrate, adjacent to said serpentine portion of said first channel, and configured to evaporate a portion of the fluid in said serpentine portion of said first channel, said evaporated portion passing through said membrane into said cavity; and a cooler positioned on said second substrate, adjacent to said serpentine portion of said second channel, and configured to cool said evaporated fluid portion in said serpentine portion of said second channel.