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Heat recovery by ventilation


The system for comfortable ventilation consists of ducts via which the house is supplied with fresh, draft-free air which is also free of particulates and inhibits noise transmission from outside. Used, odorous and moist air is extracted from kitchens, bathrooms and WC's. During the cold seasons the energy contained in this air is used in the heat exchanger to heat the supply air and save valuable heating energy. In the warmer seasons an underground heat exchange can pre cool the supply air and provide a pollen and insect free interior climate. The ventilation unit's intelligent and user-friendly control systems combine increased comfort with maximum well-being whilst adding value to, and protecting the structure of, your home.


PAUL introduces a revolutionary technology - the counter flow channel type heat exchanger. Compared with conventional plate heat exchangers the new, profiled
plates result in a doubling of the surface area across which heat is exchanged. This enables a heat recovery rate of 85-99%. Air extracted at 20°C can, for example, heat
incoming air from 0°C to 18°C.


Cross Channel Counter Flow Concept
Air flows through the heat exchanger in square-sectioned channels, a cross-section of which resembles a chess board. This channel flow concept enables heat exchange to take place across 4 surfaces instead of just 2. This improves efficiency compared with the common plate type heat exchangers. Counter Flow Concept heat exchangers have proven themselves to be significantly more efficient than the more common cross flow type.


The heart of every Heat Recovery Ventilation system is the heat exchanger (HE). This is where the heat contained in the warm, extracted air is transferred to the cold, inflowing air.

Paul heat recovery

Paul heat recovery