Flooded solutions for oil-free applications EF - Compact high efficiency evaporators Application The EF flooded evaporators have been specifically design for high efficiency water chillers where oil-free turbo-compressors are used. The target of this concept of chiller is to maximize the COP (Coefficient of Performance) taking the energy efficiency to new peaks, in process cooling, air-conditioning and refrigeration applications where the operation of the cooling system is crucial and the chiller is often working at partial load. R134a is the refrigerant normally used and the absence of lubricant oil is optimizing the heat exchanger performance. The performance The innovative Alfa Laval design allows to keep into reduced sizes the flooded evaporation function but beside this important aspect, EF flooded evaporators can be defined as “the most efficient evaporators on earth” as their performance in terms of approach (difference between water leaving temperature and evaporation temperature) can be really the minimum available in the industry, allowing the highest COP levels in the market. Extensive test campaign demonstrated that in water and air-cooled chillers at nominal conditions the approach can be reduced at 0.5K (COP level 6 with a watercooled chiller at full load). The design features Some design characteristics: • Integrate separator, which permits to not have an external vessel; • High efficiency exchange tubes, design in order to maximize the refrigerant boiling performance; • Optimal refrigerant distribution and tube geometry, preventing preferential flows; • Optimal separation volume and plate design, ensuring that just vapour refrigerant is reaching the compressors; • Water-side low pressure drop design; • Global compactness, which reduces the footprint of the chiller and the refrigerant charge; • Rich standard equipment, including compressor support, feet and refrigerant sight glasses; • Full range of optional, including thermal insulation, liquid level management and non-standard materials. EFS225, flooded evaporator

Working principle Liquid refrigerant coming from the condenser enters the evaporator through a connection located underneath the shell. A distribution plate helps the refrigerant to flood the refrigerant circuit up to the highest row of tubes (normally placed at half of the shell height), avoiding preferential paths. When the refrigerant makes contact with the tubes, it is boiling. The evaporation process is completed as refrigerant vapour, including some liquid residual, ascends towards the compressor. The upper distribution plate blocks any remaining liquid droplets, thereby fully protecting...