A water pump that uses thermal energy from the sun is to undergo field testing before potentially being used by farmers in the developing world for irrigating fields. The device uses a non-inertive-feedback thermofluidic engine (NIFTE) that converts relatively small temperature differences between its heat source and heat sink into mechanical force.
Thermal water pump could aid farmers in developing nations | News | The Engineer
NIFTE is the core product of an univerisyt spin-off, http://www.thermofluidics.com/ . It would be interesting to have more details.
