How does it work?
The counterflow heat exchanger is as standard equipped with centre-mounted bypass dampers and two heat exchanger dampers for variable and automatic regulation of the heat exchanger’s efficiency on heat recovery.
The counterflow heat exchanger is available in two versions:
- Maximum Pressure Efficiency (MPE) with focus on low pressure drop
- Maximum Temperature Efficiency (MTE) where high temperature efficiency is a priority
Even with high temperature efficiency, the annual energy efficiency will be slightly lower than with a rotary heat exchanger as the counterflow heat exchanger requires defrosting.
Consideration is given to the pressure drop across the heat exchanger, the extract air temperature, the moisture content in the extract air and the outdoor air temperature. The control system individually regulates dampers for bypass and the heat exchanger for section-by-section defrosting without the formation of frost. This enables high annual efficiency, smaller air heaters and pressure-drop-optimised operations during the spring and autumn.
Cold weather and humid extract air pose a risk of frost formation in the heat exchanger. To prevent this, Swegon’s GOLD PX includes our patented defrosting control RECOfrost. RECOfrost adjusts the pressure drop across the heat exchanger in periods when full recovery is not needed, e.g. in spring and autumn. The result is excellent temperature efficiency and energy balance, in any climate.