Solid plastic heat exchangers form the core of plastic central air handling units.
Energy recovery takes the form of cold or heat extraction from the contaminated exhaust air streams, which can be fed into the outside air for preheating or cooling.
Heat exchangers are ideally suited for use in closed-loop systems.
- energy recovery for industrial ventilation systems
- air cooling or heating of (corrosive) liquids using exhaust air / air
- ventilation and heating of industrial production facilities
- cooling, heating or drying corrosive gas or exhaust air
Plastic plate heat exchangers are the best choice for highly corrosive contaminants. For exhaust air from brine baths, electroplating plants and laboratory air, among others, the plate heat exchanger is usually made of PP. For particularly aggressive media (e.g. chromic acid) the heat exchanger can also be made of PVC.
The devices have been designed with the characteristics of PP and PVC in mind. Particular care has been taken to control the large expansion coefficients typical of plastics in combination with the asymmetrical temperature profiles that occur in the plate exchanger.
Ignoring the problem leads to considerable leakage between the air streams, due to distortion of the individual plates.
Although this precaution will ensure many years’ trouble-free operation of the heat exchanger, the following points must be observed:
Appropriate measures must be taken to ensure that plate heat exchangers are not exposed to temperatures higher than 90°C (PVC 60°C), even temporarily. This also applies to the cleaning process!
The plate heat exchangers must not be exposed to any contaminants other than those known at the time of ordering. The suitability of the plastic must be checked for each application.