The Recair recuperation principle Good ventilation is very important, but when the outside air temperature differs considerably from the indoor air temperature, ventilation results in a great deal of energy loss. The key to Recair recuperation technology is that it enables and maximises the exchange of energy between the incoming and outgoing airflows before the energy dissipates in the atmosphere. Optimum recuperation (i.e., 100% thermal effectiveness) is achieved when the air temperature at the end of the cooling trajectory is equal to the counterflow at the beginning of the heating trajectory, and vice versa. It is impossible to realise this ideal situation in practice, but Recair Sensitive makes it possible to achieve thermal effectiveness of between 90-98%, thanks to its unique, patented design. The triangular ducts in the recuperator are arranged so that each one is surrounded by parallel ducts in which the air is in counterflow (see Fig. 1). Each fresh-air duct is surrounded by three ducts filled with warmer exhaust air. Likewise, each duct with exhaust air is surrounded by three fresh-air ducts. This maximises the surface area over which energy can efficiently be transferred, recaptured and reused. This design principle is what makes the Recair Sensitive’s outstanding performance possible. In comparison with conventional cross-flow recuperators of the same size, the Recair Sensitive’s thermal effectiveness is at least 33% better. The unique duct system design even gives the Recair Sensitive an advantage over counterflow plate recuperators: with air-flow space being the same, it has a heat exchange capacity that is almost 3,5x higher. Figure 1: Triangular ducts principle. 3 Pagina 2

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