Emerging Technologies for Food Processing, 2nd Edition

28.3. Types of High-Pressure Freezing Processes

According to the phase diagram of water, three different types of high-pressure freezing processes can be distinguished in terms of the way in which the phase transition occurs:

1. High-pressure-assisted freezing (HPAF)

2. High-pressure-shift freezing (HPSF)

3. High-pressure-induced freezing (HPIF)

where pressure assisted means phase transition under constant pressure; pressure shift means phase transition due to a pressure release and pressure induced means phase transition initiated by a pressure increase and continued at constant pressure. This terminology was first suggested by Knorr et al. (1998), who presented different idealized freezing paths on the phase diagram of water. Before that, terms ...