An method for processing a fluid, having a vacuum chamber having an associated heater, to heat a condensable gas therewithin, a spray nozzle to atomize a cool fluid, having a non-condensible gas dissolved therewithin, a vacuum line to maintain reduced pressure in the vacuum chamber and remove non-condensing gas, and a control, for maintaining steady state conditions in the vacuum chamber by controlling pressure and temperature conditions. Gases condenses on the atomized droplets to release a latent heat of vaporization.