EF - Compact high efficiency evaporator0 pages

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