Water immersion techniques appeared to be the most efficacious methods to rapidly lower core body temperature [cold water (14-17 °C/57.2-62.6 °F), colder water (8-12 °C/48.2-53.6°F) and ice water (1-5 °C/ 33.8-41 °F)] and were significantly faster than passive cooling.

Which cooling method works the fastest first aid?

Conduction and evaporation are the two modes of cooling employed in the treatment of heat-related illness. Studies have shown ice water immersion to be the most effective and most rapid. However, there are obvious barriers to performing this in an emergency department.

Which cooling method is the fastest?

For suitable products, vacuum cooling is the fastest of all cooling methods. Typically, only 20 – 40 minutes is needed to reduce temperature of leafy products from 30°C to 4°C. In the example shown below, vacuum cooling reduced the temperature of harvested broccoli by 11°C in 15 minutes.