Why is PCD more energy efficient than a conventional Spray Dryer?

In PCD, the liquid and the droplets are hit in a more intense way than a nozzle or a disc. This is because the pulses hit the droplets many times, and because the spray accelerates close to  speed of sound. That makes the mass and energy transfer quicker, then, higher air inlet temperatures can be applied without product damaging.

With higher air inlet temperatures, less air is needed (50-70% less) to evaporate the same amount of water. Less air means that waste heat that goes out in the exhaust air, is reduced.