They approached SRS Frigadon to help them with a solution to keep their vegetables in good condition for longer at their store in Kolbu. The team at SRS Frigadon, located in Stratford upon Avon, did its homework before embarking on this large 14,000m³ quadruple chamber carrot cold store installation.
More energy saving come from the EC Low Energy fans fitted to the Frigadon air cooled chiller together with its built-in PEO (Pump Energy Optimisation). This reduces the mass flow of fluid when the cooling demands are low.
Heat recovery had also been incorporated within the engineering design of the 300kW Frigadon chiller.
SRS Frigadon provided a fluid refrigeration system that operates at low pressures of only 1.5bar – tap water pressure. This is the perfect solution compared with the high pressure CO2 systems which operate up to 120bar to the gas cooler.
With the demands being to supply such a system to operate at a 98% RH at air temperature of +1°C then the HYCOOL 30 fluid (-4°C flow) was the best selected solution.
Another significant factor was to minimise risks of product degradation. The higher HYCOOL operating flow temperature of -4°C enables higher evaporation temperatures and lower pressure drops which, in turn, will reduce compressor energy use.
The 300kW hydrocarbon SRS Frigadon stainless steel chiller with only 4 x 5.5kg R1270 Bitzer compressor circuits incorporates the SRS WFD (Warm Fluid Defrost.) enabling a rapid defrosting with the warm HYCOOL circulated through the coils. The idea with the WFD is to allow the HYCOOL temperature to rise, thus melting the ice (if any) from within the coil minimising disturbance to temperature and humidity balance within the carrot cold stores.
Such a defrosting strategy means that the compressors run less to remove all of the unwanted defrost heat which can be generated within other types of refrigeration installations which minimises defrosting costs.