PRS Technology is based on the physical principle of Thermal Accumulation provided by the heat of fusion of eutectics previously frozen by circulating refrigerant when power from mains and/or solar has competitive prices and/or is available.
PRS Reefer Containers have Thermo Accumulators (TA) installed on internal walls and ceilings.
A Smart Thermo Charger (STC) is connected to the PRS Reefer Container and generates frozen gas that circulates into all Thermo Accumulators, which store cooling energy. This loading procedure takes between 48 and 72 hours.
Once the Pre-Trip Thermal Charge is complete, the STC and power supply are disconnected and the Thermo Accumulators release the stored cooling energy, which maintain the preservation conditions at the optimal values. This principle allows PRS Reefer Containers to be independent from a power supply for up to 25 days.
Thermal Autonomy is complete when the PRS Reefer Container maintains an internal temperature of 0-5°C, which occurs after the Full Thermal Charge in accordance with ATP. Those ATP conditions require constant a 30°C temperature (without sun radiation), and pre-refrigerated products having a heat of evolution less than 20 W/ton. This mode is used during transport, guaranteeing an unplugged and uninterrupted cold chain.
PRS Cold Stores fulfils with the fundamental requirements for optimal preservation of fresh foodstuff as defined by ASHRAE (American Society of Heating Refrigeration and Air-conditioning Engineers):
Comparative temperature recording of a PRS Cold Store vs. a conventional one.