Arc Flash Boundary (ARC) - is the distance at which an electrical arc can flash. outward, which may endanger employees working on electrical equipment. Flash Protection Boundary (FPB) - theJcalculated safe working distance from. electrical equipment which would not expose the employee to the hazards.
One advantage of freeze drying is that food preserved in this method can last longer than food preserved in virtually any other way. Freeze dried foods, if stored properly, can last for years, even decades, and taste exactly as they did the day they were bought fresh.
Food drying is an excellent solar energy application since food drying primarily requires heat, and solar radiation is easily converted to heat. A clear or translucent glazing allows sunlight to enter an enclosed chamber where it is converted to heat when it strikes a dark interior surface.