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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.
- Type:
- Plate & Shell, XPS 50
- Variant:
- fully welded shell
- Features:
- with dome to increase the vapor space
- Installation site:
- Italy
- Typ:
- Plate & Shell, XPS 150
- Variant:
- fully welded
- Features:
- eccentric plate pack with internal droplet separator
- Installation site:
- Germany
- 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.
- 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 ...