Plate heat exchangers in Refrigeration

In refrigeration Plate and shell heat exchangers are used as evaporators, condensers or economizers.

Evaporator (EVAP):

The evaporating refrigerant cools the hot fluid (for example, an external glycol circuit) by taking the heat out as latent heat, therefore having a low flowrate and a high heat transfer cofficient. The evaporator in the refrigeration cycle is also called "Chiller".

Condenser (COND):

Plate and Shell heat exchangers are mainly used as a condenser when a liquid needs to be heated on the secondary side, for heat recovery. When there is no heat recovery required, or suitable heat sink, the heat is ejected directly to the ambient air, finned tube heat exchangers are typically used as “air condensers”.

Economizer (ECO):

To improve the efficiency of the plant an economizer can be used for heat recovery.


Ammonia refrigeration

Ammonia is often used as refrigerant for cooling temperatures in the range -10 °C to -20 °C. GESMEX heat exchangers are very well suited for evaporators. A large nozzle on the shell accomodates the low density vapour. Separators can be integrated in the shell remove liquid droplets.

Example:
Oil cooler, flooded ammonia evaporator
Type:
Plate & Shell, XPS 50
Variant:
fully welded shell
Features:
with dome to increase the vapor space
Installation site:
Italy


Example:
Oil cooler, flooded ammonia evaporator
Typ:
Plate & Shell, XPS 150
Variant:
fully welded
Features:
eccentric plate pack with internal droplet separator
Installation site:
Germany


Example:
Flooded ammonia evaporator with separator
Type:
Plate & Shell, XPS 50
Variant:
fully welded
Features:
eccentrically with external droplet separator
Installation site:
Netherlands


CO2 - refrigeration

Carbon dioxide (CO2) is a natural refrigerant, which is increasingly being used. CO2, compared to synthetic refrigerants (R134a, for example, R12) has a lower environmental impact, with a lower global warming potential, and no harmful effects on the ozone layer. However, high evaporation pressures of 30-40bar are needed to operate a refrigeration cycle.

This is above the capability of conventional plate and frame heat exchanger, however GESMEX heat exchangers are particularly well suited for CO2 evaporators, since they have an extremely high pressure capability, whilst providing the advantages of a plate heat exchanger.

Example:
Flooded CO2 evaporator with separator
Type:
Plate & Shell, XPS 50
Variant:
fully welded shell
Features:
design pressure 120bar
Installation site:
mobile in a container


Heat exchangers in utility systems and for heat recovery

In addition to process-specific tasks, GESMEX plate heat exchangers are also used in numerous auxiliary and utility systems, such as: heating of cleaning solutions, cooling lubricating oil, drying compressed air, jacket cooling ...

GESMEX plate heat exchangers are used for heat recovery from exhaust vapors or flash steam, in sewage systems, for heat recovery or power generation from waste gases ...

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XPS

XPS – Plate & Shell heat exchangers are highly suitable for heat transfer between liquids and gases or for evaporation and condensation duties. The gasket-free and cylindrical design allows operating pressures from full vacuum to 400bar and temperatures ranging from -200 to 500°C.

XPT

XPT – Thermoplate heat exchangers can handle dirty media and show low pressure drop even with high volume flows. The all welded plate-pairs are used from vacuum to 60 bar and from -200 to 800 °C.