Construction and dimension The Recair Sensitive can be used for air temperatures between -30 and +50 °C. The recuperator is constructed completely from polystyrene - from the foils to the casing. Only solvent-free elastic adhesives are used. The Recair Sensitive RS 300 has a width of 232 mm and a length of 481 mm, the heigth can vary from 150 mm to 500 mm (see Fig 2). It is also possible for several recuperators to operate in parallel. The largest recuperator (500 mm) weighs ± 5 kg and has a heat exchange surface of ± 34 m2 and a volume of 46 liters. Figure 2: Dimensions. 60° Efficient performance The effectiveness and pressure drop as a function of the airflow is illustrated in Fig. 3/4 (Note: this diagram is based on a dry return air temperature of 20 °C and a mass balance). These values have been confirmed in tests by the Eindhoven University of Technology as well as the Netherlands Organisation for Applied Scientific Research TNO. Please note that there is no direct linear relationship between the supply-air temperature and the outside-air temperature when it comes to effectiveness: In fact, effectiveness will increase even further under conditions of high indoor relative humidity, with a potential of reaching up to 98% thermal effectiveness (see Fig. 5). At extreme condensation, the pressure drop in the return air may double. The overall result is a very small difference in temperature between the supply and return air, leading to greater indoor comfort and lower basic energy requirements. Reduced freezing length 461 mm length 332 mm length 481 mm 8 mm When outside air temperatures are very low, freezing may occur at the end of a recuperator’s return-air duct if the temperature of the exhaust air drops below 0 °C. In the Recair Sensitive, the condensation heat of the moisture in the return air helps keep the exhaust air above the freezing point, even when the outside air is much colder (see Fig. 6). The annual number of hours that the recuperator will freeze is therefore much lower than the actual number of hours of outdoor freezing temperatures. Manufacturers can also reduce the number of freezing hours even further by adjusting air intake, mass balance and recirculation. 4 height 150 - 500 mm width 232 mm Pagina 3
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